// SPDX-License-Identifier: GPL-2.0
/*
 * Device driver for the PMU in Apple PowerBooks and PowerMacs.
 *
 * The VIA (versatile interface adapter) interfaces to the PMU,
 * a 6805 microprocessor core whose primary function is to control
 * battery charging and system power on the PowerBook 3400 and 2400.
 * The PMU also controls the ADB (Apple Desktop Bus) which connects
 * to the keyboard and mouse, as well as the non-volatile RAM
 * and the RTC (real time clock) chip.
 *
 * Copyright (C) 1998 Paul Mackerras and Fabio Riccardi.
 * Copyright (C) 2001-2002 Benjamin Herrenschmidt
 * Copyright (C) 2006-2007 Johannes Berg
 *
 * THIS DRIVER IS BECOMING A TOTAL MESS !
 *  - Cleanup atomically disabling reply to PMU events after
 *    a sleep or a freq. switch
 *
 */
#include <linux/stdarg.h>
#include <linux/mutex.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/sched/signal.h>
#include <linux/miscdevice.h>
#include <linux/blkdev.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/cuda.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/syscore_ops.h>
#include <linux/freezer.h>
#include <linux/syscalls.h>
#include <linux/suspend.h>
#include <linux/cpu.h>
#include <linux/compat.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/uaccess.h>
#include <linux/pgtable.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/irq.h>
#ifdef CONFIG_PPC_PMAC
#include <asm/pmac_feature.h>
#include <asm/pmac_pfunc.h>
#include <asm/pmac_low_i2c.h>
#include <asm/mmu_context.h>
#include <asm/cputable.h>
#include <asm/time.h>
#include <asm/backlight.h>
#else
#include <asm/macintosh.h>
#include <asm/macints.h>
#include <asm/mac_via.h>
#endif

#include "via-pmu-event.h"

/* Some compile options */
#undef DEBUG_SLEEP

/* How many iterations between battery polls */
#define BATTERY_POLLING_COUNT   2

static DEFINE_MUTEX(pmu_info_proc_mutex);

/* VIA registers - spaced 0x200 bytes apart */
#define RS              0x200           /* skip between registers */
#define B               0               /* B-side data */
#define A               RS              /* A-side data */
#define DIRB            (2*RS)          /* B-side direction (1=output) */
#define DIRA            (3*RS)          /* A-side direction (1=output) */
#define T1CL            (4*RS)          /* Timer 1 ctr/latch (low 8 bits) */
#define T1CH            (5*RS)          /* Timer 1 counter (high 8 bits) */
#define T1LL            (6*RS)          /* Timer 1 latch (low 8 bits) */
#define T1LH            (7*RS)          /* Timer 1 latch (high 8 bits) */
#define T2CL            (8*RS)          /* Timer 2 ctr/latch (low 8 bits) */
#define T2CH            (9*RS)          /* Timer 2 counter (high 8 bits) */
#define SR              (10*RS)         /* Shift register */
#define ACR             (11*RS)         /* Auxiliary control register */
#define PCR             (12*RS)         /* Peripheral control register */
#define IFR             (13*RS)         /* Interrupt flag register */
#define IER             (14*RS)         /* Interrupt enable register */
#define ANH             (15*RS)         /* A-side data, no handshake */

/* Bits in B data register: both active low */
#ifdef CONFIG_PPC_PMAC
#define TACK            0x08            /* Transfer acknowledge (input) */
#define TREQ            0x10            /* Transfer request (output) */
#else
#define TACK            0x02
#define TREQ            0x04
#endif

/* Bits in ACR */
#define SR_CTRL         0x1c            /* Shift register control bits */
#define SR_EXT          0x0c            /* Shift on external clock */
#define SR_OUT          0x10            /* Shift out if 1 */

/* Bits in IFR and IER */
#define IER_SET         0x80            /* set bits in IER */
#define IER_CLR         0               /* clear bits in IER */
#define SR_INT          0x04            /* Shift register full/empty */
#define CB2_INT         0x08
#define CB1_INT         0x10            /* transition on CB1 input */

static volatile enum pmu_state {
        uninitialized = 0,
        idle,
        sending,
        intack,
        reading,
        reading_intr,
        locked,
} pmu_state;

static volatile enum int_data_state {
        int_data_empty,
        int_data_fill,
        int_data_ready,
        int_data_flush
} int_data_state[2] = { int_data_empty, int_data_empty };

static struct adb_request *current_req;
static struct adb_request *last_req;
static struct adb_request *req_awaiting_reply;
static unsigned char interrupt_data[2][32];
static int interrupt_data_len[2];
static int int_data_last;
static unsigned char *reply_ptr;
static int data_index;
static int data_len;
static volatile int adb_int_pending;
static volatile int disable_poll;
static int pmu_kind = PMU_UNKNOWN;
static int pmu_fully_inited;
static int pmu_has_adb;
#ifdef CONFIG_PPC_PMAC
static volatile unsigned char __iomem *via1;
static volatile unsigned char __iomem *via2;
static struct device_node *vias;
static struct device_node *gpio_node;
#endif
static unsigned char __iomem *gpio_reg;
static int gpio_irq = 0;
static int gpio_irq_enabled = -1;
static volatile int pmu_suspended;
static DEFINE_SPINLOCK(pmu_lock);
static u8 pmu_intr_mask;
static int pmu_version;
static int drop_interrupts;
#if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC32)
static int option_lid_wakeup = 1;
#endif /* CONFIG_SUSPEND && CONFIG_PPC32 */
static unsigned long async_req_locks;

#define NUM_IRQ_STATS 13
static unsigned int pmu_irq_stats[NUM_IRQ_STATS];

static struct proc_dir_entry *proc_pmu_root;
static struct proc_dir_entry *proc_pmu_info;
static struct proc_dir_entry *proc_pmu_irqstats;
static struct proc_dir_entry *proc_pmu_options;
static int option_server_mode;

int pmu_battery_count;
static int pmu_cur_battery;
unsigned int pmu_power_flags = PMU_PWR_AC_PRESENT;
struct pmu_battery_info pmu_batteries[PMU_MAX_BATTERIES];
static int query_batt_timer = BATTERY_POLLING_COUNT;
static struct adb_request batt_req;
static struct proc_dir_entry *proc_pmu_batt[PMU_MAX_BATTERIES];

int asleep;

#ifdef CONFIG_ADB
static int adb_dev_map;
static int pmu_adb_flags;

static int pmu_probe(void);
static int pmu_init(void);
static int pmu_send_request(struct adb_request *req, int sync);
static int pmu_adb_autopoll(int devs);
static int pmu_adb_reset_bus(void);
#endif /* CONFIG_ADB */

static int init_pmu(void);
static void pmu_start(void);
static irqreturn_t via_pmu_interrupt(int irq, void *arg);
static irqreturn_t gpio1_interrupt(int irq, void *arg);
#ifdef CONFIG_PROC_FS
static int pmu_info_proc_show(struct seq_file *m, void *v);
static int pmu_irqstats_proc_show(struct seq_file *m, void *v);
static int pmu_battery_proc_show(struct seq_file *m, void *v);
#endif
static void pmu_pass_intr(unsigned char *data, int len);
static const struct proc_ops pmu_options_proc_ops;

#ifdef CONFIG_ADB
const struct adb_driver via_pmu_driver = {
        .name         = "PMU",
        .probe        = pmu_probe,
        .init         = pmu_init,
        .send_request = pmu_send_request,
        .autopoll     = pmu_adb_autopoll,
        .poll         = pmu_poll_adb,
        .reset_bus    = pmu_adb_reset_bus,
};
#endif /* CONFIG_ADB */

extern void low_sleep_handler(void);
extern void enable_kernel_altivec(void);
extern void enable_kernel_fp(void);

#ifdef DEBUG_SLEEP
int pmu_polled_request(struct adb_request *req);
void pmu_blink(int n);
#endif

/*
 * This table indicates for each PMU opcode:
 * - the number of data bytes to be sent with the command, or -1
 *   if a length byte should be sent,
 * - the number of response bytes which the PMU will return, or
 *   -1 if it will send a length byte.
 */
static const s8 pmu_data_len[256][2] = {
/*         0       1       2       3       4       5       6       7  */
/*00*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*08*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
/*10*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*18*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
/*20*/  {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
/*28*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
/*30*/  { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*38*/  { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
/*40*/  { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*48*/  { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
/*50*/  { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
/*58*/  { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
/*60*/  { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*68*/  { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
/*70*/  { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*78*/  { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
/*80*/  { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*88*/  { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
/*90*/  { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*98*/  { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
/*a0*/  { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
/*a8*/  { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
/*b0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*b8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
/*c0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*c8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
/*d0*/  { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*d8*/  { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
/*e0*/  {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
/*e8*/  { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
/*f0*/  {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
/*f8*/  {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
};

static char *pbook_type[] = {
        "Unknown PowerBook",
        "PowerBook 2400/3400/3500(G3)",
        "PowerBook G3 Series",
        "1999 PowerBook G3",
        "Core99"
};

int __init find_via_pmu(void)
{
#ifdef CONFIG_PPC_PMAC
        int err;
        u64 taddr;
        struct resource res;

        if (pmu_state != uninitialized)
                return 1;
        vias = of_find_node_by_name(NULL, "via-pmu");
        if (vias == NULL)
                return 0;

        err = of_address_to_resource(vias, 0, &res);
        if (err) {
                printk(KERN_ERR "via-pmu: Error getting \"reg\" property !\n");
                goto fail;
        }
        taddr = res.start;

        pmu_has_adb = 1;

        pmu_intr_mask = PMU_INT_PCEJECT |
                        PMU_INT_SNDBRT |
                        PMU_INT_ADB |
                        PMU_INT_TICK;
        
        if (of_node_name_eq(vias->parent, "ohare") ||
            of_device_is_compatible(vias->parent, "ohare"))
                pmu_kind = PMU_OHARE_BASED;
        else if (of_device_is_compatible(vias->parent, "paddington"))
                pmu_kind = PMU_PADDINGTON_BASED;
        else if (of_device_is_compatible(vias->parent, "heathrow"))
                pmu_kind = PMU_HEATHROW_BASED;
        else if (of_device_is_compatible(vias->parent, "Keylargo")
                 || of_device_is_compatible(vias->parent, "K2-Keylargo")) {
                struct device_node *gpiop;
                struct device_node *adbp;

                pmu_kind = PMU_KEYLARGO_BASED;
                adbp = of_find_node_by_type(NULL, "adb");
                pmu_has_adb = (adbp != NULL);
                of_node_put(adbp);
                pmu_intr_mask = PMU_INT_PCEJECT |
                                PMU_INT_SNDBRT |
                                PMU_INT_ADB |
                                PMU_INT_TICK |
                                PMU_INT_ENVIRONMENT;
                
                gpiop = of_find_node_by_name(NULL, "gpio");
                if (gpiop) {
                        if (!of_address_to_resource(gpiop, 0, &res))
                                gpio_reg = ioremap(res.start, 0x10);
                        of_node_put(gpiop);
                }
                if (gpio_reg == NULL) {
                        printk(KERN_ERR "via-pmu: Can't find GPIO reg !\n");
                        goto fail;
                }
        } else
                pmu_kind = PMU_UNKNOWN;

        via1 = via2 = ioremap(taddr, 0x2000);
        if (via1 == NULL) {
                printk(KERN_ERR "via-pmu: Can't map address !\n");
                goto fail_via_remap;
        }
        
        out_8(&via1[IER], IER_CLR | 0x7f);      /* disable all intrs */
        out_8(&via1[IFR], 0x7f);                        /* clear IFR */

        pmu_state = idle;

        if (!init_pmu())
                goto fail_init;

        sys_ctrler = SYS_CTRLER_PMU;
        
        return 1;

 fail_init:
        iounmap(via1);
        via1 = via2 = NULL;
 fail_via_remap:
        iounmap(gpio_reg);
        gpio_reg = NULL;
 fail:
        of_node_put(vias);
        vias = NULL;
        pmu_state = uninitialized;
        return 0;
#else
        if (macintosh_config->adb_type != MAC_ADB_PB2)
                return 0;

        pmu_kind = PMU_UNKNOWN;

        pmu_has_adb = 1;

        pmu_intr_mask = PMU_INT_PCEJECT |
                        PMU_INT_SNDBRT |
                        PMU_INT_ADB |
                        PMU_INT_TICK;

        pmu_state = idle;

        if (!init_pmu()) {
                pmu_state = uninitialized;
                return 0;
        }

        return 1;
#endif /* !CONFIG_PPC_PMAC */
}

#ifdef CONFIG_ADB
static int pmu_probe(void)
{
        return pmu_state == uninitialized ? -ENODEV : 0;
}

static int pmu_init(void)
{
        return pmu_state == uninitialized ? -ENODEV : 0;
}
#endif /* CONFIG_ADB */

/*
 * We can't wait until pmu_init gets called, that happens too late.
 * It happens after IDE and SCSI initialization, which can take a few
 * seconds, and by that time the PMU could have given up on us and
 * turned us off.
 * Thus this is called with arch_initcall rather than device_initcall.
 */
static int __init via_pmu_start(void)
{
        unsigned int __maybe_unused irq;

        if (pmu_state == uninitialized)
                return -ENODEV;

        batt_req.complete = 1;

#ifdef CONFIG_PPC_PMAC
        irq = irq_of_parse_and_map(vias, 0);
        if (!irq) {
                printk(KERN_ERR "via-pmu: can't map interrupt\n");
                return -ENODEV;
        }
        /* We set IRQF_NO_SUSPEND because we don't want the interrupt
         * to be disabled between the 2 passes of driver suspend, we
         * control our own disabling for that one
         */
        if (request_irq(irq, via_pmu_interrupt, IRQF_NO_SUSPEND,
                        "VIA-PMU", (void *)0)) {
                printk(KERN_ERR "via-pmu: can't request irq %d\n", irq);
                return -ENODEV;
        }

        if (pmu_kind == PMU_KEYLARGO_BASED) {
                gpio_node = of_find_node_by_name(NULL, "extint-gpio1");
                if (gpio_node == NULL)
                        gpio_node = of_find_node_by_name(NULL,
                                                         "pmu-interrupt");
                if (gpio_node)
                        gpio_irq = irq_of_parse_and_map(gpio_node, 0);

                if (gpio_irq) {
                        if (request_irq(gpio_irq, gpio1_interrupt,
                                        IRQF_NO_SUSPEND, "GPIO1 ADB",
                                        (void *)0))
                                printk(KERN_ERR "pmu: can't get irq %d"
                                       " (GPIO1)\n", gpio_irq);
                        else
                                gpio_irq_enabled = 1;
                }
        }

        /* Enable interrupts */
        out_8(&via1[IER], IER_SET | SR_INT | CB1_INT);
#else
        if (request_irq(IRQ_MAC_ADB_SR, via_pmu_interrupt, IRQF_NO_SUSPEND,
                        "VIA-PMU-SR", NULL)) {
                pr_err("%s: couldn't get SR irq\n", __func__);
                return -ENODEV;
        }
        if (request_irq(IRQ_MAC_ADB_CL, via_pmu_interrupt, IRQF_NO_SUSPEND,
                        "VIA-PMU-CL", NULL)) {
                pr_err("%s: couldn't get CL irq\n", __func__);
                free_irq(IRQ_MAC_ADB_SR, NULL);
                return -ENODEV;
        }
#endif /* !CONFIG_PPC_PMAC */

        pmu_fully_inited = 1;

        /* Make sure PMU settle down before continuing. This is _very_ important
         * since the IDE probe may shut interrupts down for quite a bit of time. If
         * a PMU communication is pending while this happens, the PMU may timeout
         * Not that on Core99 machines, the PMU keeps sending us environement
         * messages, we should find a way to either fix IDE or make it call
         * pmu_suspend() before masking interrupts. This can also happens while
         * scolling with some fbdevs.
         */
        do {
                pmu_poll();
        } while (pmu_state != idle);

        return 0;
}

arch_initcall(via_pmu_start);

/*
 * This has to be done after pci_init, which is a subsys_initcall.
 */
static int __init via_pmu_dev_init(void)
{
        if (pmu_state == uninitialized)
                return -ENODEV;

#ifdef CONFIG_PMAC_BACKLIGHT
        /* Initialize backlight */
        pmu_backlight_init();
#endif

#ifdef CONFIG_PPC32
        if (of_machine_is_compatible("AAPL,3400/2400") ||
                of_machine_is_compatible("AAPL,3500")) {
                int mb = pmac_call_feature(PMAC_FTR_GET_MB_INFO,
                        NULL, PMAC_MB_INFO_MODEL, 0);
                pmu_battery_count = 1;
                if (mb == PMAC_TYPE_COMET)
                        pmu_batteries[0].flags |= PMU_BATT_TYPE_COMET;
                else
                        pmu_batteries[0].flags |= PMU_BATT_TYPE_HOOPER;
        } else if (of_machine_is_compatible("AAPL,PowerBook1998") ||
                of_machine_is_compatible("PowerBook1,1")) {
                pmu_battery_count = 2;
                pmu_batteries[0].flags |= PMU_BATT_TYPE_SMART;
                pmu_batteries[1].flags |= PMU_BATT_TYPE_SMART;
        } else {
                struct device_node* prim =
                        of_find_node_by_name(NULL, "power-mgt");
                const u32 *prim_info = NULL;
                if (prim)
                        prim_info = of_get_property(prim, "prim-info", NULL);
                if (prim_info) {
                        /* Other stuffs here yet unknown */
                        pmu_battery_count = (prim_info[6] >> 16) & 0xff;
                        pmu_batteries[0].flags |= PMU_BATT_TYPE_SMART;
                        if (pmu_battery_count > 1)
                                pmu_batteries[1].flags |= PMU_BATT_TYPE_SMART;
                }
                of_node_put(prim);
        }
#endif /* CONFIG_PPC32 */

        /* Create /proc/pmu */
        proc_pmu_root = proc_mkdir("pmu", NULL);
        if (proc_pmu_root) {
                long i;

                for (i=0; i<pmu_battery_count; i++) {
                        char title[16];
                        sprintf(title, "battery_%ld", i);
                        proc_pmu_batt[i] = proc_create_single_data(title, 0,
                                        proc_pmu_root, pmu_battery_proc_show,
                                        (void *)i);
                }

                proc_pmu_info = proc_create_single("info", 0, proc_pmu_root,
                                pmu_info_proc_show);
                proc_pmu_irqstats = proc_create_single("interrupts", 0,
                                proc_pmu_root, pmu_irqstats_proc_show);
                proc_pmu_options = proc_create("options", 0600, proc_pmu_root,
                                                &pmu_options_proc_ops);
        }
        return 0;
}

device_initcall(via_pmu_dev_init);

static int
init_pmu(void)
{
        int timeout;
        struct adb_request req;

        /* Negate TREQ. Set TACK to input and TREQ to output. */
        out_8(&via2[B], in_8(&via2[B]) | TREQ);
        out_8(&via2[DIRB], (in_8(&via2[DIRB]) | TREQ) & ~TACK);

        pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, pmu_intr_mask);
        timeout =  100000;
        while (!req.complete) {
                if (--timeout < 0) {
                        printk(KERN_ERR "init_pmu: no response from PMU\n");
                        return 0;
                }
                udelay(10);
                pmu_poll();
        }

        /* ack all pending interrupts */
        timeout = 100000;
        interrupt_data[0][0] = 1;
        while (interrupt_data[0][0] || pmu_state != idle) {
                if (--timeout < 0) {
                        printk(KERN_ERR "init_pmu: timed out acking intrs\n");
                        return 0;
                }
                if (pmu_state == idle)
                        adb_int_pending = 1;
                via_pmu_interrupt(0, NULL);
                udelay(10);
        }

        /* Tell PMU we are ready.  */
        if (pmu_kind == PMU_KEYLARGO_BASED) {
                pmu_request(&req, NULL, 2, PMU_SYSTEM_READY, 2);
                while (!req.complete)
                        pmu_poll();
        }

        /* Read PMU version */
        pmu_request(&req, NULL, 1, PMU_GET_VERSION);
        pmu_wait_complete(&req);
        if (req.reply_len > 0)
                pmu_version = req.reply[0];
        
        /* Read server mode setting */
        if (pmu_kind == PMU_KEYLARGO_BASED) {
                pmu_request(&req, NULL, 2, PMU_POWER_EVENTS,
                            PMU_PWR_GET_POWERUP_EVENTS);
                pmu_wait_complete(&req);
                if (req.reply_len == 2) {
                        if (req.reply[1] & PMU_PWR_WAKEUP_AC_INSERT)
                                option_server_mode = 1;
                        printk(KERN_INFO "via-pmu: Server Mode is %s\n",
                               option_server_mode ? "enabled" : "disabled");
                }
        }

        printk(KERN_INFO "PMU driver v%d initialized for %s, firmware: %02x\n",
               PMU_DRIVER_VERSION, pbook_type[pmu_kind], pmu_version);

        return 1;
}

int
pmu_get_model(void)
{
        return pmu_kind;
}

static void pmu_set_server_mode(int server_mode)
{
        struct adb_request req;

        if (pmu_kind != PMU_KEYLARGO_BASED)
                return;

        option_server_mode = server_mode;
        pmu_request(&req, NULL, 2, PMU_POWER_EVENTS, PMU_PWR_GET_POWERUP_EVENTS);
        pmu_wait_complete(&req);
        if (req.reply_len < 2)
                return;
        if (server_mode)
                pmu_request(&req, NULL, 4, PMU_POWER_EVENTS,
                            PMU_PWR_SET_POWERUP_EVENTS,
                            req.reply[0], PMU_PWR_WAKEUP_AC_INSERT); 
        else
                pmu_request(&req, NULL, 4, PMU_POWER_EVENTS,
                            PMU_PWR_CLR_POWERUP_EVENTS,
                            req.reply[0], PMU_PWR_WAKEUP_AC_INSERT); 
        pmu_wait_complete(&req);
}

/* This new version of the code for 2400/3400/3500 powerbooks
 * is inspired from the implementation in gkrellm-pmu
 */
static void
done_battery_state_ohare(struct adb_request* req)
{
#ifdef CONFIG_PPC_PMAC
        /* format:
         *  [0]    :  flags
         *    0x01 :  AC indicator
         *    0x02 :  charging
         *    0x04 :  battery exist
         *    0x08 :  
         *    0x10 :  
         *    0x20 :  full charged
         *    0x40 :  pcharge reset
         *    0x80 :  battery exist
         *
         *  [1][2] :  battery voltage
         *  [3]    :  CPU temperature
         *  [4]    :  battery temperature
         *  [5]    :  current
         *  [6][7] :  pcharge
         *              --tkoba
         */
        unsigned int bat_flags = PMU_BATT_TYPE_HOOPER;
        long pcharge, charge, vb, vmax, lmax;
        long vmax_charging, vmax_charged;
        long amperage, voltage, time, max;
        int mb = pmac_call_feature(PMAC_FTR_GET_MB_INFO,
                        NULL, PMAC_MB_INFO_MODEL, 0);

        if (req->reply[0] & 0x01)
                pmu_power_flags |= PMU_PWR_AC_PRESENT;
        else
                pmu_power_flags &= ~PMU_PWR_AC_PRESENT;
        
        if (mb == PMAC_TYPE_COMET) {
                vmax_charged = 189;
                vmax_charging = 213;
                lmax = 6500;
        } else {
                vmax_charged = 330;
                vmax_charging = 330;
                lmax = 6500;
        }
        vmax = vmax_charged;

        /* If battery installed */
        if (req->reply[0] & 0x04) {
                bat_flags |= PMU_BATT_PRESENT;
                if (req->reply[0] & 0x02)
                        bat_flags |= PMU_BATT_CHARGING;
                vb = (req->reply[1] << 8) | req->reply[2];
                voltage = (vb * 265 + 72665) / 10;
                amperage = req->reply[5];
                if ((req->reply[0] & 0x01) == 0) {
                        if (amperage > 200)
                                vb += ((amperage - 200) * 15)/100;
                } else if (req->reply[0] & 0x02) {
                        vb = (vb * 97) / 100;
                        vmax = vmax_charging;
                }
                charge = (100 * vb) / vmax;
                if (req->reply[0] & 0x40) {
                        pcharge = (req->reply[6] << 8) + req->reply[7];
                        if (pcharge > lmax)
                                pcharge = lmax;
                        pcharge *= 100;
                        pcharge = 100 - pcharge / lmax;
                        if (pcharge < charge)
                                charge = pcharge;
                }
                if (amperage > 0)
                        time = (charge * 16440) / amperage;
                else
                        time = 0;
                max = 100;
                amperage = -amperage;
        } else
                charge = max = amperage = voltage = time = 0;

        pmu_batteries[pmu_cur_battery].flags = bat_flags;
        pmu_batteries[pmu_cur_battery].charge = charge;
        pmu_batteries[pmu_cur_battery].max_charge = max;
        pmu_batteries[pmu_cur_battery].amperage = amperage;
        pmu_batteries[pmu_cur_battery].voltage = voltage;
        pmu_batteries[pmu_cur_battery].time_remaining = time;
#endif /* CONFIG_PPC_PMAC */

        clear_bit(0, &async_req_locks);
}

static void
done_battery_state_smart(struct adb_request* req)
{
        /* format:
         *  [0] : format of this structure (known: 3,4,5)
         *  [1] : flags
         *  
         *  format 3 & 4:
         *  
         *  [2] : charge
         *  [3] : max charge
         *  [4] : current
         *  [5] : voltage
         *  
         *  format 5:
         *  
         *  [2][3] : charge
         *  [4][5] : max charge
         *  [6][7] : current
         *  [8][9] : voltage
         */
         
        unsigned int bat_flags = PMU_BATT_TYPE_SMART;
        int amperage;
        unsigned int capa, max, voltage;
        
        if (req->reply[1] & 0x01)
                pmu_power_flags |= PMU_PWR_AC_PRESENT;
        else
                pmu_power_flags &= ~PMU_PWR_AC_PRESENT;


        capa = max = amperage = voltage = 0;
        
        if (req->reply[1] & 0x04) {
                bat_flags |= PMU_BATT_PRESENT;
                switch(req->reply[0]) {
                        case 3:
                        case 4: capa = req->reply[2];
                                max = req->reply[3];
                                amperage = *((signed char *)&req->reply[4]);
                                voltage = req->reply[5];
                                break;
                        case 5: capa = (req->reply[2] << 8) | req->reply[3];
                                max = (req->reply[4] << 8) | req->reply[5];
                                amperage = *((signed short *)&req->reply[6]);
                                voltage = (req->reply[8] << 8) | req->reply[9];
                                break;
                        default:
                                pr_warn("pmu.c: unrecognized battery info, "
                                        "len: %d, %4ph\n", req->reply_len,
                                                           req->reply);
                                break;
                }
        }

        if ((req->reply[1] & 0x01) && (amperage > 0))
                bat_flags |= PMU_BATT_CHARGING;

        pmu_batteries[pmu_cur_battery].flags = bat_flags;
        pmu_batteries[pmu_cur_battery].charge = capa;
        pmu_batteries[pmu_cur_battery].max_charge = max;
        pmu_batteries[pmu_cur_battery].amperage = amperage;
        pmu_batteries[pmu_cur_battery].voltage = voltage;
        if (amperage) {
                if ((req->reply[1] & 0x01) && (amperage > 0))
                        pmu_batteries[pmu_cur_battery].time_remaining
                                = ((max-capa) * 3600) / amperage;
                else
                        pmu_batteries[pmu_cur_battery].time_remaining
                                = (capa * 3600) / (-amperage);
        } else
                pmu_batteries[pmu_cur_battery].time_remaining = 0;

        pmu_cur_battery = (pmu_cur_battery + 1) % pmu_battery_count;

        clear_bit(0, &async_req_locks);
}

static void
query_battery_state(void)
{
        if (test_and_set_bit(0, &async_req_locks))
                return;
        if (pmu_kind == PMU_OHARE_BASED)
                pmu_request(&batt_req, done_battery_state_ohare,
                        1, PMU_BATTERY_STATE);
        else
                pmu_request(&batt_req, done_battery_state_smart,
                        2, PMU_SMART_BATTERY_STATE, pmu_cur_battery+1);
}

#ifdef CONFIG_PROC_FS
static int pmu_info_proc_show(struct seq_file *m, void *v)
{
        seq_printf(m, "PMU driver version     : %d\n", PMU_DRIVER_VERSION);
        seq_printf(m, "PMU firmware version   : %02x\n", pmu_version);
        seq_printf(m, "AC Power               : %d\n",
                ((pmu_power_flags & PMU_PWR_AC_PRESENT) != 0) || pmu_battery_count == 0);
        seq_printf(m, "Battery count          : %d\n", pmu_battery_count);

        return 0;
}

static int pmu_irqstats_proc_show(struct seq_file *m, void *v)
{
        int i;
        static const char *irq_names[NUM_IRQ_STATS] = {
                "Unknown interrupt (type 0)",
                "Unknown interrupt (type 1)",
                "PC-Card eject button",
                "Sound/Brightness button",
                "ADB message",
                "Battery state change",
                "Environment interrupt",
                "Tick timer",
                "Ghost interrupt (zero len)",
                "Empty interrupt (empty mask)",
                "Max irqs in a row",
                "Total CB1 triggered events",
                "Total GPIO1 triggered events",
        };

        for (i = 0; i < NUM_IRQ_STATS; i++) {
                seq_printf(m, " %2u: %10u (%s)\n",
                             i, pmu_irq_stats[i], irq_names[i]);
        }
        return 0;
}

static int pmu_battery_proc_show(struct seq_file *m, void *v)
{
        long batnum = (long)m->private;
        
        seq_putc(m, '\n');
        seq_printf(m, "flags      : %08x\n", pmu_batteries[batnum].flags);
        seq_printf(m, "charge     : %d\n", pmu_batteries[batnum].charge);
        seq_printf(m, "max_charge : %d\n", pmu_batteries[batnum].max_charge);
        seq_printf(m, "current    : %d\n", pmu_batteries[batnum].amperage);
        seq_printf(m, "voltage    : %d\n", pmu_batteries[batnum].voltage);
        seq_printf(m, "time rem.  : %d\n", pmu_batteries[batnum].time_remaining);
        return 0;
}

static int pmu_options_proc_show(struct seq_file *m, void *v)
{
#if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC32)
        if (pmu_kind == PMU_KEYLARGO_BASED &&
            pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,-1) >= 0)
                seq_printf(m, "lid_wakeup=%d\n", option_lid_wakeup);
#endif
        if (pmu_kind == PMU_KEYLARGO_BASED)
                seq_printf(m, "server_mode=%d\n", option_server_mode);

        return 0;
}

static int pmu_options_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, pmu_options_proc_show, NULL);
}

static ssize_t pmu_options_proc_write(struct file *file,
                const char __user *buffer, size_t count, loff_t *pos)
{
        char tmp[33];
        char *label, *val;
        size_t fcount = count;
        
        if (!count)
                return -EINVAL;
        if (count > 32)
                count = 32;
        if (copy_from_user(tmp, buffer, count))
                return -EFAULT;
        tmp[count] = 0;

        label = tmp;
        while(*label == ' ')
                label++;
        val = label;
        while(*val && (*val != '=')) {
                if (*val == ' ')
                        *val = 0;
                val++;
        }
        if ((*val) == 0)
                return -EINVAL;
        *(val++) = 0;
        while(*val == ' ')
                val++;
#if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC32)
        if (pmu_kind == PMU_KEYLARGO_BASED &&
            pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,-1) >= 0)
                if (!strcmp(label, "lid_wakeup"))
                        option_lid_wakeup = ((*val) == '1');
#endif
        if (pmu_kind == PMU_KEYLARGO_BASED && !strcmp(label, "server_mode")) {
                int new_value;
                new_value = ((*val) == '1');
                if (new_value != option_server_mode)
                        pmu_set_server_mode(new_value);
        }
        return fcount;
}

static const struct proc_ops pmu_options_proc_ops = {
        .proc_open      = pmu_options_proc_open,
        .proc_read      = seq_read,
        .proc_lseek     = seq_lseek,
        .proc_release   = single_release,
        .proc_write     = pmu_options_proc_write,
};
#endif

#ifdef CONFIG_ADB
/* Send an ADB command */
static int pmu_send_request(struct adb_request *req, int sync)
{
        int i, ret;

        if (pmu_state == uninitialized || !pmu_fully_inited) {
                req->complete = 1;
                return -ENXIO;
        }

        ret = -EINVAL;

        switch (req->data[0]) {
        case PMU_PACKET:
                for (i = 0; i < req->nbytes - 1; ++i)
                        req->data[i] = req->data[i+1];
                --req->nbytes;
                if (pmu_data_len[req->data[0]][1] != 0) {
                        req->reply[0] = ADB_RET_OK;
                        req->reply_len = 1;
                } else
                        req->reply_len = 0;
                ret = pmu_queue_request(req);
                break;
        case CUDA_PACKET:
                switch (req->data[1]) {
                case CUDA_GET_TIME:
                        if (req->nbytes != 2)
                                break;
                        req->data[0] = PMU_READ_RTC;
                        req->nbytes = 1;
                        req->reply_len = 3;
                        req->reply[0] = CUDA_PACKET;
                        req->reply[1] = 0;
                        req->reply[2] = CUDA_GET_TIME;
                        ret = pmu_queue_request(req);
                        break;
                case CUDA_SET_TIME:
                        if (req->nbytes != 6)
                                break;
                        req->data[0] = PMU_SET_RTC;
                        req->nbytes = 5;
                        for (i = 1; i <= 4; ++i)
                                req->data[i] = req->data[i+1];
                        req->reply_len = 3;
                        req->reply[0] = CUDA_PACKET;
                        req->reply[1] = 0;
                        req->reply[2] = CUDA_SET_TIME;
                        ret = pmu_queue_request(req);
                        break;
                }
                break;
        case ADB_PACKET:
                if (!pmu_has_adb)
                        return -ENXIO;
                for (i = req->nbytes - 1; i > 1; --i)
                        req->data[i+2] = req->data[i];
                req->data[3] = req->nbytes - 2;
                req->data[2] = pmu_adb_flags;
                /*req->data[1] = req->data[1];*/
                req->data[0] = PMU_ADB_CMD;
                req->nbytes += 2;
                req->reply_expected = 1;
                req->reply_len = 0;
                ret = pmu_queue_request(req);
                break;
        }
        if (ret) {
                req->complete = 1;
                return ret;
        }

        if (sync)
                while (!req->complete)
                        pmu_poll();

        return 0;
}

/* Enable/disable autopolling */
static int __pmu_adb_autopoll(int devs)
{
        struct adb_request req;

        if (devs) {
                pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
                            adb_dev_map >> 8, adb_dev_map);
                pmu_adb_flags = 2;
        } else {
                pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
                pmu_adb_flags = 0;
        }
        while (!req.complete)
                pmu_poll();
        return 0;
}

static int pmu_adb_autopoll(int devs)
{
        if (pmu_state == uninitialized || !pmu_fully_inited || !pmu_has_adb)
                return -ENXIO;

        adb_dev_map = devs;
        return __pmu_adb_autopoll(devs);
}

/* Reset the ADB bus */
static int pmu_adb_reset_bus(void)
{
        struct adb_request req;
        int save_autopoll = adb_dev_map;

        if (pmu_state == uninitialized || !pmu_fully_inited || !pmu_has_adb)
                return -ENXIO;

        /* anyone got a better idea?? */
        __pmu_adb_autopoll(0);

        req.nbytes = 4;
        req.done = NULL;
        req.data[0] = PMU_ADB_CMD;
        req.data[1] = ADB_BUSRESET;
        req.data[2] = 0;
        req.data[3] = 0;
        req.data[4] = 0;
        req.reply_len = 0;
        req.reply_expected = 1;
        if (pmu_queue_request(&req) != 0) {
                printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
                return -EIO;
        }
        pmu_wait_complete(&req);

        if (save_autopoll != 0)
                __pmu_adb_autopoll(save_autopoll);

        return 0;
}
#endif /* CONFIG_ADB */

/* Construct and send a pmu request */
int
pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
            int nbytes, ...)
{
        va_list list;
        int i;

        if (pmu_state == uninitialized)
                return -ENXIO;

        if (nbytes < 0 || nbytes > 32) {
                printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
                req->complete = 1;
                return -EINVAL;
        }
        req->nbytes = nbytes;
        req->done = done;
        va_start(list, nbytes);
        for (i = 0; i < nbytes; ++i)
                req->data[i] = va_arg(list, int);
        va_end(list);
        req->reply_len = 0;
        req->reply_expected = 0;
        return pmu_queue_request(req);
}

int
pmu_queue_request(struct adb_request *req)
{
        unsigned long flags;
        int nsend;

        if (pmu_state == uninitialized) {
                req->complete = 1;
                return -ENXIO;
        }
        if (req->nbytes <= 0) {
                req->complete = 1;
                return 0;
        }
        nsend = pmu_data_len[req->data[0]][0];
        if (nsend >= 0 && req->nbytes != nsend + 1) {
                req->complete = 1;
                return -EINVAL;
        }

        req->next = NULL;
        req->sent = 0;
        req->complete = 0;

        spin_lock_irqsave(&pmu_lock, flags);
        if (current_req) {
                last_req->next = req;
                last_req = req;
        } else {
                current_req = req;
                last_req = req;
                if (pmu_state == idle)
                        pmu_start();
        }
        spin_unlock_irqrestore(&pmu_lock, flags);

        return 0;
}

static inline void
wait_for_ack(void)
{
        /* Sightly increased the delay, I had one occurrence of the message
         * reported
         */
        int timeout = 4000;
        while ((in_8(&via2[B]) & TACK) == 0) {
                if (--timeout < 0) {
                        printk(KERN_ERR "PMU not responding (!ack)\n");
                        return;
                }
                udelay(10);
        }
}

/* New PMU seems to be very sensitive to those timings, so we make sure
 * PCI is flushed immediately */
static inline void
send_byte(int x)
{
        out_8(&via1[ACR], in_8(&via1[ACR]) | SR_OUT | SR_EXT);
        out_8(&via1[SR], x);
        out_8(&via2[B], in_8(&via2[B]) & ~TREQ);        /* assert TREQ */
        (void)in_8(&via2[B]);
}

static inline void
recv_byte(void)
{
        out_8(&via1[ACR], (in_8(&via1[ACR]) & ~SR_OUT) | SR_EXT);
        in_8(&via1[SR]);                /* resets SR */
        out_8(&via2[B], in_8(&via2[B]) & ~TREQ);
        (void)in_8(&via2[B]);
}

static inline void
pmu_done(struct adb_request *req)
{
        void (*done)(struct adb_request *) = req->done;
        mb();
        req->complete = 1;
        /* Here, we assume that if the request has a done member, the
         * struct request will survive to setting req->complete to 1
         */
        if (done)
                (*done)(req);
}

static void
pmu_start(void)
{
        struct adb_request *req;

        /* assert pmu_state == idle */
        /* get the packet to send */
        req = current_req;
        if (!req || pmu_state != idle
            || (/*req->reply_expected && */req_awaiting_reply))
                return;

        pmu_state = sending;
        data_index = 1;
        data_len = pmu_data_len[req->data[0]][0];

        /* Sounds safer to make sure ACK is high before writing. This helped
         * kill a problem with ADB and some iBooks
         */
        wait_for_ack();
        /* set the shift register to shift out and send a byte */
        send_byte(req->data[0]);
}

void
pmu_poll(void)
{
        if (pmu_state == uninitialized)
                return;
        if (disable_poll)
                return;
        via_pmu_interrupt(0, NULL);
}

void
pmu_poll_adb(void)
{
        if (pmu_state == uninitialized)
                return;
        if (disable_poll)
                return;
        /* Kicks ADB read when PMU is suspended */
        adb_int_pending = 1;
        do {
                via_pmu_interrupt(0, NULL);
        } while (pmu_suspended && (adb_int_pending || pmu_state != idle
                || req_awaiting_reply));
}

void
pmu_wait_complete(struct adb_request *req)
{
        if (pmu_state == uninitialized)
                return;
        while((pmu_state != idle && pmu_state != locked) || !req->complete)
                via_pmu_interrupt(0, NULL);
}

/* This function loops until the PMU is idle and prevents it from
 * anwsering to ADB interrupts. pmu_request can still be called.
 * This is done to avoid spurrious shutdowns when we know we'll have
 * interrupts switched off for a long time
 */
void
pmu_suspend(void)
{
        unsigned long flags;

        if (pmu_state == uninitialized)
                return;
        
        spin_lock_irqsave(&pmu_lock, flags);
        pmu_suspended++;
        if (pmu_suspended > 1) {
                spin_unlock_irqrestore(&pmu_lock, flags);
                return;
        }

        do {
                spin_unlock_irqrestore(&pmu_lock, flags);
                if (req_awaiting_reply)
                        adb_int_pending = 1;
                via_pmu_interrupt(0, NULL);
                spin_lock_irqsave(&pmu_lock, flags);
                if (!adb_int_pending && pmu_state == idle && !req_awaiting_reply) {
                        if (gpio_irq >= 0)
                                disable_irq_nosync(gpio_irq);
                        out_8(&via1[IER], CB1_INT | IER_CLR);
                        spin_unlock_irqrestore(&pmu_lock, flags);
                        break;
                }
        } while (1);
}

void
pmu_resume(void)
{
        unsigned long flags;

        if (pmu_state == uninitialized || pmu_suspended < 1)
                return;

        spin_lock_irqsave(&pmu_lock, flags);
        pmu_suspended--;
        if (pmu_suspended > 0) {
                spin_unlock_irqrestore(&pmu_lock, flags);
                return;
        }
        adb_int_pending = 1;
        if (gpio_irq >= 0)
                enable_irq(gpio_irq);
        out_8(&via1[IER], CB1_INT | IER_SET);
        spin_unlock_irqrestore(&pmu_lock, flags);
        pmu_poll();
}

/* Interrupt data could be the result data from an ADB cmd */
static void
pmu_handle_data(unsigned char *data, int len)
{
        unsigned char ints;
        int idx;
        int i = 0;

        asleep = 0;
        if (drop_interrupts || len < 1) {
                adb_int_pending = 0;
                pmu_irq_stats[8]++;
                return;
        }

        /* Get PMU interrupt mask */
        ints = data[0];

        /* Record zero interrupts for stats */
        if (ints == 0)
                pmu_irq_stats[9]++;

        /* Hack to deal with ADB autopoll flag */
        if (ints & PMU_INT_ADB)
                ints &= ~(PMU_INT_ADB_AUTO | PMU_INT_AUTO_SRQ_POLL);

next:
        if (ints == 0) {
                if (i > pmu_irq_stats[10])
                        pmu_irq_stats[10] = i;
                return;
        }
        i++;

        idx = ffs(ints) - 1;
        ints &= ~BIT(idx);

        pmu_irq_stats[idx]++;

        /* Note: for some reason, we get an interrupt with len=1,
         * data[0]==0 after each normal ADB interrupt, at least
         * on the Pismo. Still investigating...  --BenH
         */
        switch (BIT(idx)) {
        case PMU_INT_ADB:
                if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
                        struct adb_request *req = req_awaiting_reply;
                        if (!req) {
                                printk(KERN_ERR "PMU: extra ADB reply\n");
                                return;
                        }
                        req_awaiting_reply = NULL;
                        if (len <= 2)
                                req->reply_len = 0;
                        else {
                                memcpy(req->reply, data + 1, len - 1);
                                req->reply_len = len - 1;
                        }
                        pmu_done(req);
                } else {
#ifdef CONFIG_XMON
                        if (len == 4 && data[1] == 0x2c) {
                                extern int xmon_wants_key, xmon_adb_keycode;
                                if (xmon_wants_key) {
                                        xmon_adb_keycode = data[2];
                                        return;
                                }
                        }
#endif /* CONFIG_XMON */
#ifdef CONFIG_ADB
                        /*
                         * XXX On the [23]400 the PMU gives us an up
                         * event for keycodes 0x74 or 0x75 when the PC
                         * card eject buttons are released, so we
                         * ignore those events.
                         */
                        if (!(pmu_kind == PMU_OHARE_BASED && len == 4
                              && data[1] == 0x2c && data[3] == 0xff
                              && (data[2] & ~1) == 0xf4))
                                adb_input(data+1, len-1, 1);
#endif /* CONFIG_ADB */         
                }
                break;

        /* Sound/brightness button pressed */
        case PMU_INT_SNDBRT:
#ifdef CONFIG_PMAC_BACKLIGHT
                if (len == 3)
                        pmac_backlight_set_legacy_brightness_pmu(data[1] >> 4);
#endif
                break;

        /* Tick interrupt */
        case PMU_INT_TICK:
                /* Environment or tick interrupt, query batteries */
                if (pmu_battery_count) {
                        if ((--query_batt_timer) == 0) {
                                query_battery_state();
                                query_batt_timer = BATTERY_POLLING_COUNT;
                        }
                }
                break;

        case PMU_INT_ENVIRONMENT:
                if (pmu_battery_count)
                        query_battery_state();
                pmu_pass_intr(data, len);
                /* len == 6 is probably a bad check. But how do I
                 * know what PMU versions send what events here? */
                if (IS_ENABLED(CONFIG_ADB_PMU_EVENT) && len == 6) {
                        via_pmu_event(PMU_EVT_POWER, !!(data[1]&8));
                        via_pmu_event(PMU_EVT_LID, data[1]&1);
                }
                break;

        default:
               pmu_pass_intr(data, len);
        }
        goto next;
}

static struct adb_request*
pmu_sr_intr(void)
{
        struct adb_request *req;
        int bite = 0;

        if (in_8(&via2[B]) & TREQ) {
                printk(KERN_ERR "PMU: spurious SR intr (%x)\n", in_8(&via2[B]));
                return NULL;
        }
        /* The ack may not yet be low when we get the interrupt */
        while ((in_8(&via2[B]) & TACK) != 0)
                        ;

        /* if reading grab the byte, and reset the interrupt */
        if (pmu_state == reading || pmu_state == reading_intr)
                bite = in_8(&via1[SR]);

        /* reset TREQ and wait for TACK to go high */
        out_8(&via2[B], in_8(&via2[B]) | TREQ);
        wait_for_ack();

        switch (pmu_state) {
        case sending:
                req = current_req;
                if (data_len < 0) {
                        data_len = req->nbytes - 1;
                        send_byte(data_len);
                        break;
                }
                if (data_index <= data_len) {
                        send_byte(req->data[data_index++]);
                        break;
                }
                req->sent = 1;
                data_len = pmu_data_len[req->data[0]][1];
                if (data_len == 0) {
                        pmu_state = idle;
                        current_req = req->next;
                        if (req->reply_expected)
                                req_awaiting_reply = req;
                        else
                                return req;
                } else {
                        pmu_state = reading;
                        data_index = 0;
                        reply_ptr = req->reply + req->reply_len;
                        recv_byte();
                }
                break;

        case intack:
                data_index = 0;
                data_len = -1;
                pmu_state = reading_intr;
                reply_ptr = interrupt_data[int_data_last];
                recv_byte();
                if (gpio_irq >= 0 && !gpio_irq_enabled) {
                        enable_irq(gpio_irq);
                        gpio_irq_enabled = 1;
                }
                break;

        case reading:
        case reading_intr:
                if (data_len == -1) {
                        data_len = bite;
                        if (bite > 32)
                                printk(KERN_ERR "PMU: bad reply len %d\n", bite);
                } else if (data_index < 32) {
                        reply_ptr[data_index++] = bite;
                }
                if (data_index < data_len) {
                        recv_byte();
                        break;
                }

                if (pmu_state == reading_intr) {
                        pmu_state = idle;
                        int_data_state[int_data_last] = int_data_ready;
                        interrupt_data_len[int_data_last] = data_len;
                } else {
                        req = current_req;
                        /* 
                         * For PMU sleep and freq change requests, we lock the
                         * PMU until it's explicitly unlocked. This avoids any
                         * spurrious event polling getting in
                         */
                        current_req = req->next;
                        req->reply_len += data_index;
                        if (req->data[0] == PMU_SLEEP || req->data[0] == PMU_CPU_SPEED)
                                pmu_state = locked;
                        else
                                pmu_state = idle;
                        return req;
                }
                break;

        default:
                printk(KERN_ERR "via_pmu_interrupt: unknown state %d?\n",
                       pmu_state);
        }
        return NULL;
}

static irqreturn_t
via_pmu_interrupt(int irq, void *arg)
{
        unsigned long flags;
        int intr;
        int nloop = 0;
        int int_data = -1;
        struct adb_request *req = NULL;
        int handled = 0;

        /* This is a bit brutal, we can probably do better */
        spin_lock_irqsave(&pmu_lock, flags);
        ++disable_poll;
        
        for (;;) {
                /* On 68k Macs, VIA interrupts are dispatched individually.
                 * Unless we are polling, the relevant IRQ flag has already
                 * been cleared.
                 */
                intr = 0;
                if (IS_ENABLED(CONFIG_PPC_PMAC) || !irq) {
                        intr = in_8(&via1[IFR]) & (SR_INT | CB1_INT);
                        out_8(&via1[IFR], intr);
                }
#ifndef CONFIG_PPC_PMAC
                switch (irq) {
                case IRQ_MAC_ADB_CL:
                        intr = CB1_INT;
                        break;
                case IRQ_MAC_ADB_SR:
                        intr = SR_INT;
                        break;
                }
#endif
                if (intr == 0)
                        break;
                handled = 1;
                if (++nloop > 1000) {
                        printk(KERN_DEBUG "PMU: stuck in intr loop, "
                               "intr=%x, ier=%x pmu_state=%d\n",
                               intr, in_8(&via1[IER]), pmu_state);
                        break;
                }
                if (intr & CB1_INT) {
                        adb_int_pending = 1;
                        pmu_irq_stats[11]++;
                }
                if (intr & SR_INT) {
                        req = pmu_sr_intr();
                        if (req)
                                break;
                }
#ifndef CONFIG_PPC_PMAC
                break;
#endif
        }

recheck:
        if (pmu_state == idle) {
                if (adb_int_pending) {
                        if (int_data_state[0] == int_data_empty)
                                int_data_last = 0;
                        else if (int_data_state[1] == int_data_empty)
                                int_data_last = 1;
                        else
                                goto no_free_slot;
                        pmu_state = intack;
                        int_data_state[int_data_last] = int_data_fill;
                        /* Sounds safer to make sure ACK is high before writing.
                         * This helped kill a problem with ADB and some iBooks
                         */
                        wait_for_ack();
                        send_byte(PMU_INT_ACK);
                        adb_int_pending = 0;
                } else if (current_req)
                        pmu_start();
        }
no_free_slot:                   
        /* Mark the oldest buffer for flushing */
        if (int_data_state[!int_data_last] == int_data_ready) {
                int_data_state[!int_data_last] = int_data_flush;
                int_data = !int_data_last;
        } else if (int_data_state[int_data_last] == int_data_ready) {
                int_data_state[int_data_last] = int_data_flush;
                int_data = int_data_last;
        }
        --disable_poll;
        spin_unlock_irqrestore(&pmu_lock, flags);

        /* Deal with completed PMU requests outside of the lock */
        if (req) {
                pmu_done(req);
                req = NULL;
        }
                
        /* Deal with interrupt datas outside of the lock */
        if (int_data >= 0) {
                pmu_handle_data(interrupt_data[int_data], interrupt_data_len[int_data]);
                spin_lock_irqsave(&pmu_lock, flags);
                ++disable_poll;
                int_data_state[int_data] = int_data_empty;
                int_data = -1;
                goto recheck;
        }

        return IRQ_RETVAL(handled);
}

void
pmu_unlock(void)
{
        unsigned long flags;

        spin_lock_irqsave(&pmu_lock, flags);
        if (pmu_state == locked)
                pmu_state = idle;
        adb_int_pending = 1;
        spin_unlock_irqrestore(&pmu_lock, flags);
}


static __maybe_unused irqreturn_t
gpio1_interrupt(int irq, void *arg)
{
        unsigned long flags;

        if ((in_8(gpio_reg + 0x9) & 0x02) == 0) {
                spin_lock_irqsave(&pmu_lock, flags);
                if (gpio_irq_enabled > 0) {
                        disable_irq_nosync(gpio_irq);
                        gpio_irq_enabled = 0;
                }
                pmu_irq_stats[12]++;
                adb_int_pending = 1;
                spin_unlock_irqrestore(&pmu_lock, flags);
                via_pmu_interrupt(0, NULL);
                return IRQ_HANDLED;
        }
        return IRQ_NONE;
}

void
pmu_enable_irled(int on)
{
        struct adb_request req;

        if (pmu_state == uninitialized)
                return ;
        if (pmu_kind == PMU_KEYLARGO_BASED)
                return ;

        pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
            (on ? PMU_POW_ON : PMU_POW_OFF));
        pmu_wait_complete(&req);
}

/* Offset between Unix time (1970-based) and Mac time (1904-based) */
#define RTC_OFFSET      2082844800

time64_t pmu_get_time(void)
{
        struct adb_request req;
        u32 now;

        if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
                return 0;
        pmu_wait_complete(&req);
        if (req.reply_len != 4)
                pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
        now = (req.reply[0] << 24) + (req.reply[1] << 16) +
              (req.reply[2] << 8) + req.reply[3];
        return (time64_t)now - RTC_OFFSET;
}

int pmu_set_rtc_time(struct rtc_time *tm)
{
        u32 now;
        struct adb_request req;

        now = lower_32_bits(rtc_tm_to_time64(tm) + RTC_OFFSET);
        if (pmu_request(&req, NULL, 5, PMU_SET_RTC,
                        now >> 24, now >> 16, now >> 8, now) < 0)
                return -ENXIO;
        pmu_wait_complete(&req);
        if (req.reply_len != 0)
                pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
        return 0;
}

void
pmu_restart(void)
{
        struct adb_request req;

        if (pmu_state == uninitialized)
                return;

        local_irq_disable();

        drop_interrupts = 1;
        
        if (pmu_kind != PMU_KEYLARGO_BASED) {
                pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB |
                                                PMU_INT_TICK );
                while(!req.complete)
                        pmu_poll();
        }

        pmu_request(&req, NULL, 1, PMU_RESET);
        pmu_wait_complete(&req);
        for (;;)
                ;
}

void
pmu_shutdown(void)
{
        struct adb_request req;

        if (pmu_state == uninitialized)
                return;

        local_irq_disable();

        drop_interrupts = 1;

        if (pmu_kind != PMU_KEYLARGO_BASED) {
                pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB |
                                                PMU_INT_TICK );
                pmu_wait_complete(&req);
        } else {
                /* Disable server mode on shutdown or we'll just
                 * wake up again
                 */
                pmu_set_server_mode(0);
        }

        pmu_request(&req, NULL, 5, PMU_SHUTDOWN,
                    'M', 'A', 'T', 'T');
        pmu_wait_complete(&req);
        for (;;)
                ;
}

int
pmu_present(void)
{
        return pmu_state != uninitialized;
}

#if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC32)
/*
 * Put the powerbook to sleep.
 */
 
static u32 save_via[8];
static int __fake_sleep;

static void
save_via_state(void)
{
        save_via[0] = in_8(&via1[ANH]);
        save_via[1] = in_8(&via1[DIRA]);
        save_via[2] = in_8(&via1[B]);
        save_via[3] = in_8(&via1[DIRB]);
        save_via[4] = in_8(&via1[PCR]);
        save_via[5] = in_8(&via1[ACR]);
        save_via[6] = in_8(&via1[T1CL]);
        save_via[7] = in_8(&via1[T1CH]);
}
static void
restore_via_state(void)
{
        out_8(&via1[ANH],  save_via[0]);
        out_8(&via1[DIRA], save_via[1]);
        out_8(&via1[B],    save_via[2]);
        out_8(&via1[DIRB], save_via[3]);
        out_8(&via1[PCR],  save_via[4]);
        out_8(&via1[ACR],  save_via[5]);
        out_8(&via1[T1CL], save_via[6]);
        out_8(&via1[T1CH], save_via[7]);
        out_8(&via1[IER], IER_CLR | 0x7f);      /* disable all intrs */
        out_8(&via1[IFR], 0x7f);                        /* clear IFR */
        out_8(&via1[IER], IER_SET | SR_INT | CB1_INT);
}

#define GRACKLE_PM      (1<<7)
#define GRACKLE_DOZE    (1<<5)
#define GRACKLE_NAP     (1<<4)
#define GRACKLE_SLEEP   (1<<3)

static int powerbook_sleep_grackle(void)
{
        unsigned long save_l2cr;
        unsigned short pmcr1;
        struct adb_request req;
        struct pci_dev *grackle;

        grackle = pci_get_domain_bus_and_slot(0, 0, 0);
        if (!grackle)
                return -ENODEV;

        /* Turn off various things. Darwin does some retry tests here... */
        pmu_request(&req, NULL, 2, PMU_POWER_CTRL0, PMU_POW0_OFF|PMU_POW0_HARD_DRIVE);
        pmu_wait_complete(&req);
        pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
                PMU_POW_OFF|PMU_POW_BACKLIGHT|PMU_POW_IRLED|PMU_POW_MEDIABAY);
        pmu_wait_complete(&req);

        /* For 750, save backside cache setting and disable it */
        save_l2cr = _get_L2CR();        /* (returns -1 if not available) */

        if (!__fake_sleep) {
                /* Ask the PMU to put us to sleep */
                pmu_request(&req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
                pmu_wait_complete(&req);
        }

        /* The VIA is supposed not to be restored correctly*/
        save_via_state();
        /* We shut down some HW */
        pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,1);

        pci_read_config_word(grackle, 0x70, &pmcr1);
        /* Apparently, MacOS uses NAP mode for Grackle ??? */
        pmcr1 &= ~(GRACKLE_DOZE|GRACKLE_SLEEP); 
        pmcr1 |= GRACKLE_PM|GRACKLE_NAP;
        pci_write_config_word(grackle, 0x70, pmcr1);

        /* Call low-level ASM sleep handler */
        if (__fake_sleep)
                mdelay(5000);
        else
                low_sleep_handler();

        /* We're awake again, stop grackle PM */
        pci_read_config_word(grackle, 0x70, &pmcr1);
        pmcr1 &= ~(GRACKLE_PM|GRACKLE_DOZE|GRACKLE_SLEEP|GRACKLE_NAP); 
        pci_write_config_word(grackle, 0x70, pmcr1);

        pci_dev_put(grackle);

        /* Make sure the PMU is idle */
        pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,0);
        restore_via_state();
        
        /* Restore L2 cache */
        if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
                _set_L2CR(save_l2cr);
        
        /* Restore userland MMU context */
        switch_mmu_context(NULL, current->active_mm, NULL);

        /* Power things up */
        pmu_unlock();
        pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, pmu_intr_mask);
        pmu_wait_complete(&req);
        pmu_request(&req, NULL, 2, PMU_POWER_CTRL0,
                        PMU_POW0_ON|PMU_POW0_HARD_DRIVE);
        pmu_wait_complete(&req);
        pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
                        PMU_POW_ON|PMU_POW_BACKLIGHT|PMU_POW_CHARGER|PMU_POW_IRLED|PMU_POW_MEDIABAY);
        pmu_wait_complete(&req);

        return 0;
}

static int
powerbook_sleep_Core99(void)
{
        unsigned long save_l2cr;
        unsigned long save_l3cr;
        struct adb_request req;
        
        if (pmac_call_feature(PMAC_FTR_SLEEP_STATE,NULL,0,-1) < 0) {
                printk(KERN_ERR "Sleep mode not supported on this machine\n");
                return -ENOSYS;
        }

        if (num_online_cpus() > 1 || cpu_is_offline(0))
                return -EAGAIN;

        /* Stop environment and ADB interrupts */
        pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, 0);
        pmu_wait_complete(&req);

        /* Tell PMU what events will wake us up */
        pmu_request(&req, NULL, 4, PMU_POWER_EVENTS, PMU_PWR_CLR_WAKEUP_EVENTS,
                0xff, 0xff);
        pmu_wait_complete(&req);
        pmu_request(&req, NULL, 4, PMU_POWER_EVENTS, PMU_PWR_SET_WAKEUP_EVENTS,
                0, PMU_PWR_WAKEUP_KEY |
                (option_lid_wakeup ? PMU_PWR_WAKEUP_LID_OPEN : 0));
        pmu_wait_complete(&req);

        /* Save the state of the L2 and L3 caches */
        save_l3cr = _get_L3CR();        /* (returns -1 if not available) */
        save_l2cr = _get_L2CR();        /* (returns -1 if not available) */

        if (!__fake_sleep) {
                /* Ask the PMU to put us to sleep */
                pmu_request(&req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
                pmu_wait_complete(&req);
        }

        /* The VIA is supposed not to be restored correctly*/
        save_via_state();

        /* Shut down various ASICs. There's a chance that we can no longer
         * talk to the PMU after this, so I moved it to _after_ sending the
         * sleep command to it. Still need to be checked.
         */
        pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, 1);

        /* Call low-level ASM sleep handler */
        if (__fake_sleep)
                mdelay(5000);
        else
                low_sleep_handler();

        /* Restore Apple core ASICs state */
        pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, 0);

        /* Restore VIA */
        restore_via_state();

        /* tweak LPJ before cpufreq is there */
        loops_per_jiffy *= 2;

        /* Restore video */
        pmac_call_early_video_resume();

        /* Restore L2 cache */
        if (save_l2cr != 0xffffffff && (save_l2cr & L2CR_L2E) != 0)
                _set_L2CR(save_l2cr);
        /* Restore L3 cache */
        if (save_l3cr != 0xffffffff && (save_l3cr & L3CR_L3E) != 0)
                _set_L3CR(save_l3cr);
        
        /* Restore userland MMU context */
        switch_mmu_context(NULL, current->active_mm, NULL);

        /* Tell PMU we are ready */
        pmu_unlock();
        pmu_request(&req, NULL, 2, PMU_SYSTEM_READY, 2);
        pmu_wait_complete(&req);
        pmu_request(&req, NULL, 2, PMU_SET_INTR_MASK, pmu_intr_mask);
        pmu_wait_complete(&req);

        /* Restore LPJ, cpufreq will adjust the cpu frequency */
        loops_per_jiffy /= 2;

        return 0;
}

#define PB3400_MEM_CTRL         0xf8000000
#define PB3400_MEM_CTRL_SLEEP   0x70

static void __iomem *pb3400_mem_ctrl;

static void powerbook_sleep_init_3400(void)
{
        /* map in the memory controller registers */
        pb3400_mem_ctrl = ioremap(PB3400_MEM_CTRL, 0x100);
        if (pb3400_mem_ctrl == NULL)
                printk(KERN_WARNING "ioremap failed: sleep won't be possible");
}

static int powerbook_sleep_3400(void)
{
        int i, x;
        unsigned int hid0;
        unsigned long msr;
        struct adb_request sleep_req;
        unsigned int __iomem *mem_ctrl_sleep;

        if (pb3400_mem_ctrl == NULL)
                return -ENOMEM;
        mem_ctrl_sleep = pb3400_mem_ctrl + PB3400_MEM_CTRL_SLEEP;

        /* Set the memory controller to keep the memory refreshed
           while we're asleep */
        for (i = 0x403f; i >= 0x4000; --i) {
                out_be32(mem_ctrl_sleep, i);
                do {
                        x = (in_be32(mem_ctrl_sleep) >> 16) & 0x3ff;
                } while (x == 0);
                if (x >= 0x100)
                        break;
        }

        /* Ask the PMU to put us to sleep */
        pmu_request(&sleep_req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
        pmu_wait_complete(&sleep_req);
        pmu_unlock();

        pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, 1);

        asleep = 1;

        /* Put the CPU into sleep mode */
        hid0 = mfspr(SPRN_HID0);
        hid0 = (hid0 & ~(HID0_NAP | HID0_DOZE)) | HID0_SLEEP;
        mtspr(SPRN_HID0, hid0);
        local_irq_enable();
        msr = mfmsr() | MSR_POW;
        while (asleep) {
                mb();
                mtmsr(msr);
                isync();
        }
        local_irq_disable();

        /* OK, we're awake again, start restoring things */
        out_be32(mem_ctrl_sleep, 0x3f);
        pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, 0);

        return 0;
}

#endif /* CONFIG_SUSPEND && CONFIG_PPC32 */

/*
 * Support for /dev/pmu device
 */
#define RB_SIZE         0x10
struct pmu_private {
        struct list_head list;
        int     rb_get;
        int     rb_put;
        struct rb_entry {
                unsigned short len;
                unsigned char data[16];
        }       rb_buf[RB_SIZE];
        wait_queue_head_t wait;
        spinlock_t lock;
#if defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_PMAC_BACKLIGHT)
        int     backlight_locker;
#endif
};

static LIST_HEAD(all_pmu_pvt);
static DEFINE_SPINLOCK(all_pvt_lock);

static void
pmu_pass_intr(unsigned char *data, int len)
{
        struct pmu_private *pp;
        struct list_head *list;
        int i;
        unsigned long flags;

        if (len > sizeof(pp->rb_buf[0].data))
                len = sizeof(pp->rb_buf[0].data);
        spin_lock_irqsave(&all_pvt_lock, flags);
        for (list = &all_pmu_pvt; (list = list->next) != &all_pmu_pvt; ) {
                pp = list_entry(list, struct pmu_private, list);
                spin_lock(&pp->lock);
                i = pp->rb_put + 1;
                if (i >= RB_SIZE)
                        i = 0;
                if (i != pp->rb_get) {
                        struct rb_entry *rp = &pp->rb_buf[pp->rb_put];
                        rp->len = len;
                        memcpy(rp->data, data, len);
                        pp->rb_put = i;
                        wake_up_interruptible(&pp->wait);
                }
                spin_unlock(&pp->lock);
        }
        spin_unlock_irqrestore(&all_pvt_lock, flags);
}

static int
pmu_open(struct inode *inode, struct file *file)
{
        struct pmu_private *pp;
        unsigned long flags;

        pp = kmalloc_obj(struct pmu_private);
        if (!pp)
                return -ENOMEM;
        pp->rb_get = pp->rb_put = 0;
        spin_lock_init(&pp->lock);
        init_waitqueue_head(&pp->wait);
        mutex_lock(&pmu_info_proc_mutex);
        spin_lock_irqsave(&all_pvt_lock, flags);
#if defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_PMAC_BACKLIGHT)
        pp->backlight_locker = 0;
#endif
        list_add(&pp->list, &all_pmu_pvt);
        spin_unlock_irqrestore(&all_pvt_lock, flags);
        file->private_data = pp;
        mutex_unlock(&pmu_info_proc_mutex);
        return 0;
}

static ssize_t 
pmu_read(struct file *file, char __user *buf,
                        size_t count, loff_t *ppos)
{
        struct pmu_private *pp = file->private_data;
        DECLARE_WAITQUEUE(wait, current);
        unsigned long flags;
        int ret = 0;

        if (count < 1 || !pp)
                return -EINVAL;

        spin_lock_irqsave(&pp->lock, flags);
        add_wait_queue(&pp->wait, &wait);
        set_current_state(TASK_INTERRUPTIBLE);

        for (;;) {
                ret = -EAGAIN;
                if (pp->rb_get != pp->rb_put) {
                        int i = pp->rb_get;
                        struct rb_entry *rp = &pp->rb_buf[i];
                        ret = rp->len;
                        spin_unlock_irqrestore(&pp->lock, flags);
                        if (ret > count)
                                ret = count;
                        if (ret > 0 && copy_to_user(buf, rp->data, ret))
                                ret = -EFAULT;
                        if (++i >= RB_SIZE)
                                i = 0;
                        spin_lock_irqsave(&pp->lock, flags);
                        pp->rb_get = i;
                }
                if (ret >= 0)
                        break;
                if (file->f_flags & O_NONBLOCK)
                        break;
                ret = -ERESTARTSYS;
                if (signal_pending(current))
                        break;
                spin_unlock_irqrestore(&pp->lock, flags);
                schedule();
                spin_lock_irqsave(&pp->lock, flags);
        }
        __set_current_state(TASK_RUNNING);
        remove_wait_queue(&pp->wait, &wait);
        spin_unlock_irqrestore(&pp->lock, flags);
        
        return ret;
}

static ssize_t
pmu_write(struct file *file, const char __user *buf,
                         size_t count, loff_t *ppos)
{
        return 0;
}

static __poll_t
pmu_fpoll(struct file *filp, poll_table *wait)
{
        struct pmu_private *pp = filp->private_data;
        __poll_t mask = 0;
        unsigned long flags;
        
        if (!pp)
                return 0;
        poll_wait(filp, &pp->wait, wait);
        spin_lock_irqsave(&pp->lock, flags);
        if (pp->rb_get != pp->rb_put)
                mask |= EPOLLIN;
        spin_unlock_irqrestore(&pp->lock, flags);
        return mask;
}

static int
pmu_release(struct inode *inode, struct file *file)
{
        struct pmu_private *pp = file->private_data;
        unsigned long flags;

        if (pp) {
                file->private_data = NULL;
                spin_lock_irqsave(&all_pvt_lock, flags);
                list_del(&pp->list);
                spin_unlock_irqrestore(&all_pvt_lock, flags);

#if defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_PMAC_BACKLIGHT)
                if (pp->backlight_locker)
                        pmac_backlight_enable();
#endif

                kfree(pp);
        }
        return 0;
}

#if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC32)
static void pmac_suspend_disable_irqs(void)
{
        /* Call platform functions marked "on sleep" */
        pmac_pfunc_i2c_suspend();
        pmac_pfunc_base_suspend();
}

static int powerbook_sleep(suspend_state_t state)
{
        int error = 0;

        /* Wait for completion of async requests */
        while (!batt_req.complete)
                pmu_poll();

        /* Giveup the lazy FPU & vec so we don't have to back them
         * up from the low level code
         */
        enable_kernel_fp();

#ifdef CONFIG_ALTIVEC
        if (cpu_has_feature(CPU_FTR_ALTIVEC))
                enable_kernel_altivec();
#endif /* CONFIG_ALTIVEC */

        switch (pmu_kind) {
        case PMU_OHARE_BASED:
                error = powerbook_sleep_3400();
                break;
        case PMU_HEATHROW_BASED:
        case PMU_PADDINGTON_BASED:
                error = powerbook_sleep_grackle();
                break;
        case PMU_KEYLARGO_BASED:
                error = powerbook_sleep_Core99();
                break;
        default:
                return -ENOSYS;
        }

        if (error)
                return error;

        mdelay(100);

        return 0;
}

static void pmac_suspend_enable_irqs(void)
{
        /* Force a poll of ADB interrupts */
        adb_int_pending = 1;
        via_pmu_interrupt(0, NULL);

        mdelay(10);

        /* Call platform functions marked "on wake" */
        pmac_pfunc_base_resume();
        pmac_pfunc_i2c_resume();
}

static int pmu_sleep_valid(suspend_state_t state)
{
        return state == PM_SUSPEND_MEM
                && (pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, -1) >= 0);
}

static const struct platform_suspend_ops pmu_pm_ops = {
        .enter = powerbook_sleep,
        .valid = pmu_sleep_valid,
};

static int __init register_pmu_pm_ops(void)
{
        if (pmu_kind == PMU_OHARE_BASED)
                powerbook_sleep_init_3400();
        ppc_md.suspend_disable_irqs = pmac_suspend_disable_irqs;
        ppc_md.suspend_enable_irqs = pmac_suspend_enable_irqs;
        suspend_set_ops(&pmu_pm_ops);

        return 0;
}

device_initcall(register_pmu_pm_ops);
#endif

static int pmu_ioctl(struct file *filp,
                     u_int cmd, u_long arg)
{
        __u32 __user *argp = (__u32 __user *)arg;
        int error = -EINVAL;

        switch (cmd) {
#ifdef CONFIG_PPC_PMAC
        case PMU_IOC_SLEEP:
                if (!capable(CAP_SYS_ADMIN))
                        return -EACCES;
                return pm_suspend(PM_SUSPEND_MEM);
        case PMU_IOC_CAN_SLEEP:
                if (pmac_call_feature(PMAC_FTR_SLEEP_STATE, NULL, 0, -1) < 0)
                        return put_user(0, argp);
                else
                        return put_user(1, argp);
#endif

#ifdef CONFIG_PMAC_BACKLIGHT_LEGACY
        /* Compatibility ioctl's for backlight */
        case PMU_IOC_GET_BACKLIGHT:
        {
                int brightness;

                brightness = pmac_backlight_get_legacy_brightness();
                if (brightness < 0)
                        return brightness;
                else
                        return put_user(brightness, argp);

        }
        case PMU_IOC_SET_BACKLIGHT:
        {
                int brightness;

                error = get_user(brightness, argp);
                if (error)
                        return error;

                return pmac_backlight_set_legacy_brightness(brightness);
        }
#ifdef CONFIG_INPUT_ADBHID
        case PMU_IOC_GRAB_BACKLIGHT: {
                struct pmu_private *pp = filp->private_data;

                if (pp->backlight_locker)
                        return 0;

                pp->backlight_locker = 1;
                pmac_backlight_disable();

                return 0;
        }
#endif /* CONFIG_INPUT_ADBHID */
#endif /* CONFIG_PMAC_BACKLIGHT_LEGACY */

        case PMU_IOC_GET_MODEL:
                return put_user(pmu_kind, argp);
        case PMU_IOC_HAS_ADB:
                return put_user(pmu_has_adb, argp);
        }
        return error;
}

static long pmu_unlocked_ioctl(struct file *filp,
                               u_int cmd, u_long arg)
{
        int ret;

        mutex_lock(&pmu_info_proc_mutex);
        ret = pmu_ioctl(filp, cmd, arg);
        mutex_unlock(&pmu_info_proc_mutex);

        return ret;
}

#ifdef CONFIG_COMPAT
#define PMU_IOC_GET_BACKLIGHT32 _IOR('B', 1, compat_size_t)
#define PMU_IOC_SET_BACKLIGHT32 _IOW('B', 2, compat_size_t)
#define PMU_IOC_GET_MODEL32     _IOR('B', 3, compat_size_t)
#define PMU_IOC_HAS_ADB32       _IOR('B', 4, compat_size_t)
#define PMU_IOC_CAN_SLEEP32     _IOR('B', 5, compat_size_t)
#define PMU_IOC_GRAB_BACKLIGHT32 _IOR('B', 6, compat_size_t)

static long compat_pmu_ioctl (struct file *filp, u_int cmd, u_long arg)
{
        switch (cmd) {
        case PMU_IOC_SLEEP:
                break;
        case PMU_IOC_GET_BACKLIGHT32:
                cmd = PMU_IOC_GET_BACKLIGHT;
                break;
        case PMU_IOC_SET_BACKLIGHT32:
                cmd = PMU_IOC_SET_BACKLIGHT;
                break;
        case PMU_IOC_GET_MODEL32:
                cmd = PMU_IOC_GET_MODEL;
                break;
        case PMU_IOC_HAS_ADB32:
                cmd = PMU_IOC_HAS_ADB;
                break;
        case PMU_IOC_CAN_SLEEP32:
                cmd = PMU_IOC_CAN_SLEEP;
                break;
        case PMU_IOC_GRAB_BACKLIGHT32:
                cmd = PMU_IOC_GRAB_BACKLIGHT;
                break;
        default:
                return -ENOIOCTLCMD;
        }
        return pmu_unlocked_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
}
#endif

static const struct file_operations pmu_device_fops = {
        .read           = pmu_read,
        .write          = pmu_write,
        .poll           = pmu_fpoll,
        .unlocked_ioctl = pmu_unlocked_ioctl,
#ifdef CONFIG_COMPAT
        .compat_ioctl   = compat_pmu_ioctl,
#endif
        .open           = pmu_open,
        .release        = pmu_release,
        .llseek         = noop_llseek,
};

static struct miscdevice pmu_device = {
        PMU_MINOR, "pmu", &pmu_device_fops
};

static int pmu_device_init(void)
{
        if (pmu_state == uninitialized)
                return 0;
        if (misc_register(&pmu_device) < 0)
                printk(KERN_ERR "via-pmu: cannot register misc device.\n");
        return 0;
}
device_initcall(pmu_device_init);


#ifdef DEBUG_SLEEP
static inline void 
polled_handshake(void)
{
        via2[B] &= ~TREQ; eieio();
        while ((via2[B] & TACK) != 0)
                ;
        via2[B] |= TREQ; eieio();
        while ((via2[B] & TACK) == 0)
                ;
}

static inline void 
polled_send_byte(int x)
{
        via1[ACR] |= SR_OUT | SR_EXT; eieio();
        via1[SR] = x; eieio();
        polled_handshake();
}

static inline int
polled_recv_byte(void)
{
        int x;

        via1[ACR] = (via1[ACR] & ~SR_OUT) | SR_EXT; eieio();
        x = via1[SR]; eieio();
        polled_handshake();
        x = via1[SR]; eieio();
        return x;
}

int
pmu_polled_request(struct adb_request *req)
{
        unsigned long flags;
        int i, l, c;

        req->complete = 1;
        c = req->data[0];
        l = pmu_data_len[c][0];
        if (l >= 0 && req->nbytes != l + 1)
                return -EINVAL;

        local_irq_save(flags);
        while (pmu_state != idle)
                pmu_poll();

        while ((via2[B] & TACK) == 0)
                ;
        polled_send_byte(c);
        if (l < 0) {
                l = req->nbytes - 1;
                polled_send_byte(l);
        }
        for (i = 1; i <= l; ++i)
                polled_send_byte(req->data[i]);

        l = pmu_data_len[c][1];
        if (l < 0)
                l = polled_recv_byte();
        for (i = 0; i < l; ++i)
                req->reply[i + req->reply_len] = polled_recv_byte();

        if (req->done)
                (*req->done)(req);

        local_irq_restore(flags);
        return 0;
}

/* N.B. This doesn't work on the 3400 */
void pmu_blink(int n)
{
        struct adb_request req;

        memset(&req, 0, sizeof(req));

        for (; n > 0; --n) {
                req.nbytes = 4;
                req.done = NULL;
                req.data[0] = 0xee;
                req.data[1] = 4;
                req.data[2] = 0;
                req.data[3] = 1;
                req.reply[0] = ADB_RET_OK;
                req.reply_len = 1;
                req.reply_expected = 0;
                pmu_polled_request(&req);
                mdelay(50);
                req.nbytes = 4;
                req.done = NULL;
                req.data[0] = 0xee;
                req.data[1] = 4;
                req.data[2] = 0;
                req.data[3] = 0;
                req.reply[0] = ADB_RET_OK;
                req.reply_len = 1;
                req.reply_expected = 0;
                pmu_polled_request(&req);
                mdelay(50);
        }
        mdelay(50);
}
#endif /* DEBUG_SLEEP */

#if defined(CONFIG_SUSPEND) && defined(CONFIG_PPC32)
int pmu_sys_suspended;

static int pmu_syscore_suspend(void *data)
{
        /* Suspend PMU event interrupts */
        pmu_suspend();
        pmu_sys_suspended = 1;

#ifdef CONFIG_PMAC_BACKLIGHT
        /* Tell backlight code not to muck around with the chip anymore */
        pmu_backlight_set_sleep(1);
#endif

        return 0;
}

static void pmu_syscore_resume(void *data)
{
        struct adb_request req;

        if (!pmu_sys_suspended)
                return;

        /* Tell PMU we are ready */
        pmu_request(&req, NULL, 2, PMU_SYSTEM_READY, 2);
        pmu_wait_complete(&req);

#ifdef CONFIG_PMAC_BACKLIGHT
        /* Tell backlight code it can use the chip again */
        pmu_backlight_set_sleep(0);
#endif
        /* Resume PMU event interrupts */
        pmu_resume();
        pmu_sys_suspended = 0;
}

static const struct syscore_ops pmu_syscore_ops = {
        .suspend = pmu_syscore_suspend,
        .resume = pmu_syscore_resume,
};

static struct syscore pmu_syscore = {
        .ops = &pmu_syscore_ops,
};

static int pmu_syscore_register(void)
{
        register_syscore(&pmu_syscore);

        return 0;
}
subsys_initcall(pmu_syscore_register);
#endif /* CONFIG_SUSPEND && CONFIG_PPC32 */

EXPORT_SYMBOL(pmu_request);
EXPORT_SYMBOL(pmu_queue_request);
EXPORT_SYMBOL(pmu_poll);
EXPORT_SYMBOL(pmu_poll_adb);
EXPORT_SYMBOL(pmu_wait_complete);
EXPORT_SYMBOL(pmu_suspend);
EXPORT_SYMBOL(pmu_resume);
EXPORT_SYMBOL(pmu_unlock);
#if defined(CONFIG_PPC32)
EXPORT_SYMBOL(pmu_enable_irled);
EXPORT_SYMBOL(pmu_battery_count);
EXPORT_SYMBOL(pmu_batteries);
EXPORT_SYMBOL(pmu_power_flags);
#endif /* CONFIG_SUSPEND && CONFIG_PPC32 */