// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 * keyboard input driver for i2c IR remote controls
 *
 * Copyright (c) 2000-2003 Gerd Knorr <kraxel@bytesex.org>
 * modified for PixelView (BT878P+W/FM) by
 *      Michal Kochanowicz <mkochano@pld.org.pl>
 *      Christoph Bartelmus <lirc@bartelmus.de>
 * modified for KNC ONE TV Station/Anubis Typhoon TView Tuner by
 *      Ulrich Mueller <ulrich.mueller42@web.de>
 * modified for em2820 based USB TV tuners by
 *      Markus Rechberger <mrechberger@gmail.com>
 * modified for DViCO Fusion HDTV 5 RT GOLD by
 *      Chaogui Zhang <czhang1974@gmail.com>
 * modified for MSI TV@nywhere Plus by
 *      Henry Wong <henry@stuffedcow.net>
 *      Mark Schultz <n9xmj@yahoo.com>
 *      Brian Rogers <brian_rogers@comcast.net>
 * modified for AVerMedia Cardbus by
 *      Oldrich Jedlicka <oldium.pro@seznam.cz>
 * Zilog Transmitter portions/ideas were derived from GPLv2+ sources:
 *  - drivers/char/pctv_zilogir.[ch] from Hauppauge Broadway product
 *      Copyright 2011 Hauppauge Computer works
 *  - drivers/staging/media/lirc/lirc_zilog.c
 *      Copyright (c) 2000 Gerd Knorr <kraxel@goldbach.in-berlin.de>
 *      Michal Kochanowicz <mkochano@pld.org.pl>
 *      Christoph Bartelmus <lirc@bartelmus.de>
 *      Ulrich Mueller <ulrich.mueller42@web.de>
 *      Stefan Jahn <stefan@lkcc.org>
 *      Jerome Brock <jbrock@users.sourceforge.net>
 *      Thomas Reitmayr (treitmayr@yahoo.com)
 *      Mark Weaver <mark@npsl.co.uk>
 *      Jarod Wilson <jarod@redhat.com>
 *      Copyright (C) 2011 Andy Walls <awalls@md.metrocast.net>
 */

#include <linux/unaligned.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/workqueue.h>

#include <media/rc-core.h>
#include <media/i2c/ir-kbd-i2c.h>

#define FLAG_TX         1
#define FLAG_HDPVR      2

static bool enable_hdpvr;
module_param(enable_hdpvr, bool, 0644);

static int get_key_haup_common(struct IR_i2c *ir, enum rc_proto *protocol,
                               u32 *scancode, u8 *ptoggle, int size)
{
        unsigned char buf[6];
        int start, range, toggle, dev, code, ircode, vendor;

        /* poll IR chip */
        if (size != i2c_master_recv(ir->c, buf, size))
                return -EIO;

        if (buf[0] & 0x80) {
                int offset = (size == 6) ? 3 : 0;

                /* split rc5 data block ... */
                start  = (buf[offset] >> 7) &    1;
                range  = (buf[offset] >> 6) &    1;
                toggle = (buf[offset] >> 5) &    1;
                dev    =  buf[offset]       & 0x1f;
                code   = (buf[offset+1] >> 2) & 0x3f;

                /* rc5 has two start bits
                 * the first bit must be one
                 * the second bit defines the command range:
                 * 1 = 0-63, 0 = 64 - 127
                 */
                if (!start)
                        /* no key pressed */
                        return 0;

                /* filter out invalid key presses */
                ircode = (start << 12) | (toggle << 11) | (dev << 6) | code;
                if ((ircode & 0x1fff) == 0x1fff)
                        return 0;

                if (!range)
                        code += 64;

                dev_dbg(&ir->rc->dev,
                        "ir hauppauge (rc5): s%d r%d t%d dev=%d code=%d\n",
                        start, range, toggle, dev, code);

                *protocol = RC_PROTO_RC5;
                *scancode = RC_SCANCODE_RC5(dev, code);
                *ptoggle = toggle;

                return 1;
        } else if (size == 6 && (buf[0] & 0x40)) {
                code = buf[4];
                dev = buf[3];
                vendor = get_unaligned_be16(buf + 1);

                if (vendor == 0x800f) {
                        *ptoggle = (dev & 0x80) != 0;
                        *protocol = RC_PROTO_RC6_MCE;
                        dev &= 0x7f;
                        dev_dbg(&ir->rc->dev,
                                "ir hauppauge (rc6-mce): t%d vendor=%d dev=%d code=%d\n",
                                *ptoggle, vendor, dev, code);
                } else {
                        *ptoggle = 0;
                        *protocol = RC_PROTO_RC6_6A_32;
                        dev_dbg(&ir->rc->dev,
                                "ir hauppauge (rc6-6a-32): vendor=%d dev=%d code=%d\n",
                                vendor, dev, code);
                }

                *scancode = RC_SCANCODE_RC6_6A(vendor, dev, code);

                return 1;
        }

        return 0;
}

static int get_key_haup(struct IR_i2c *ir, enum rc_proto *protocol,
                        u32 *scancode, u8 *toggle)
{
        return get_key_haup_common(ir, protocol, scancode, toggle, 3);
}

static int get_key_haup_xvr(struct IR_i2c *ir, enum rc_proto *protocol,
                            u32 *scancode, u8 *toggle)
{
        int ret;
        unsigned char buf[1] = { 0 };

        /*
         * This is the same apparent "are you ready?" poll command observed
         * watching Windows driver traffic and implemented in lirc_zilog. With
         * this added, we get far saner remote behavior with z8 chips on usb
         * connected devices, even with the default polling interval of 100ms.
         */
        ret = i2c_master_send(ir->c, buf, 1);
        if (ret != 1)
                return (ret < 0) ? ret : -EINVAL;

        return get_key_haup_common(ir, protocol, scancode, toggle, 6);
}

static int get_key_pixelview(struct IR_i2c *ir, enum rc_proto *protocol,
                             u32 *scancode, u8 *toggle)
{
        int rc;
        unsigned char b;

        /* poll IR chip */
        rc = i2c_master_recv(ir->c, &b, 1);
        if (rc != 1) {
                dev_dbg(&ir->rc->dev, "read error\n");
                if (rc < 0)
                        return rc;
                return -EIO;
        }

        *protocol = RC_PROTO_OTHER;
        *scancode = b;
        *toggle = 0;
        return 1;
}

static int get_key_fusionhdtv(struct IR_i2c *ir, enum rc_proto *protocol,
                              u32 *scancode, u8 *toggle)
{
        int rc;
        unsigned char buf[4];

        /* poll IR chip */
        rc = i2c_master_recv(ir->c, buf, 4);
        if (rc != 4) {
                dev_dbg(&ir->rc->dev, "read error\n");
                if (rc < 0)
                        return rc;
                return -EIO;
        }

        if (buf[0] != 0 || buf[1] != 0 || buf[2] != 0 || buf[3] != 0)
                dev_dbg(&ir->rc->dev, "%s: %*ph\n", __func__, 4, buf);

        /* no key pressed or signal from other ir remote */
        if(buf[0] != 0x1 ||  buf[1] != 0xfe)
                return 0;

        *protocol = RC_PROTO_UNKNOWN;
        *scancode = buf[2];
        *toggle = 0;
        return 1;
}

static int get_key_knc1(struct IR_i2c *ir, enum rc_proto *protocol,
                        u32 *scancode, u8 *toggle)
{
        int rc;
        unsigned char b;

        /* poll IR chip */
        rc = i2c_master_recv(ir->c, &b, 1);
        if (rc != 1) {
                dev_dbg(&ir->rc->dev, "read error\n");
                if (rc < 0)
                        return rc;
                return -EIO;
        }

        /* it seems that 0xFE indicates that a button is still hold
           down, while 0xff indicates that no button is hold
           down. 0xfe sequences are sometimes interrupted by 0xFF */

        dev_dbg(&ir->rc->dev, "key %02x\n", b);

        if (b == 0xff)
                return 0;

        if (b == 0xfe)
                /* keep old data */
                return 1;

        *protocol = RC_PROTO_UNKNOWN;
        *scancode = b;
        *toggle = 0;
        return 1;
}

static int get_key_geniatech(struct IR_i2c *ir, enum rc_proto *protocol,
                             u32 *scancode, u8 *toggle)
{
        int i, rc;
        unsigned char b;

        /* poll IR chip */
        for (i = 0; i < 4; i++) {
                rc = i2c_master_recv(ir->c, &b, 1);
                if (rc == 1)
                        break;
                msleep(20);
        }
        if (rc != 1) {
                dev_dbg(&ir->rc->dev, "read error\n");
                if (rc < 0)
                        return rc;
                return -EIO;
        }

        /* don't repeat the key */
        if (ir->old == b)
                return 0;
        ir->old = b;

        /* decode to RC5 */
        b &= 0x7f;
        b = (b - 1) / 2;

        dev_dbg(&ir->rc->dev, "key %02x\n", b);

        *protocol = RC_PROTO_RC5;
        *scancode = b;
        *toggle = ir->old >> 7;
        return 1;
}

static int get_key_avermedia_cardbus(struct IR_i2c *ir, enum rc_proto *protocol,
                                     u32 *scancode, u8 *toggle)
{
        unsigned char subaddr, key, keygroup;
        struct i2c_msg msg[] = { { .addr = ir->c->addr, .flags = 0,
                                   .buf = &subaddr, .len = 1},
                                 { .addr = ir->c->addr, .flags = I2C_M_RD,
                                  .buf = &key, .len = 1} };
        subaddr = 0x0d;
        if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
                dev_dbg(&ir->rc->dev, "read error\n");
                return -EIO;
        }

        if (key == 0xff)
                return 0;

        subaddr = 0x0b;
        msg[1].buf = &keygroup;
        if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
                dev_dbg(&ir->rc->dev, "read error\n");
                return -EIO;
        }

        if (keygroup == 0xff)
                return 0;

        dev_dbg(&ir->rc->dev, "read key 0x%02x/0x%02x\n", key, keygroup);
        if (keygroup < 2 || keygroup > 4) {
                dev_warn(&ir->rc->dev, "warning: invalid key group 0x%02x for key 0x%02x\n",
                         keygroup, key);
        }
        key |= (keygroup & 1) << 6;

        *protocol = RC_PROTO_UNKNOWN;
        *scancode = key;
        if (ir->c->addr == 0x41) /* AVerMedia EM78P153 */
                *scancode |= keygroup << 8;
        *toggle = 0;
        return 1;
}

/* ----------------------------------------------------------------------- */

static int ir_key_poll(struct IR_i2c *ir)
{
        enum rc_proto protocol = 0;
        u32 scancode = 0;
        u8 toggle = 0;
        int rc;

        dev_dbg(&ir->rc->dev, "%s\n", __func__);
        rc = ir->get_key(ir, &protocol, &scancode, &toggle);
        if (rc < 0) {
                dev_warn(&ir->rc->dev, "error %d\n", rc);
                return rc;
        }

        if (rc) {
                dev_dbg(&ir->rc->dev, "%s: proto = 0x%04x, scancode = 0x%08x\n",
                        __func__, protocol, scancode);
                rc_keydown(ir->rc, protocol, scancode, toggle);
        }
        return 0;
}

static void ir_work(struct work_struct *work)
{
        int rc;
        struct IR_i2c *ir = container_of(work, struct IR_i2c, work.work);

        /*
         * If the transmit code is holding the lock, skip polling for
         * IR, we'll get it to it next time round
         */
        if (mutex_trylock(&ir->lock)) {
                rc = ir_key_poll(ir);
                mutex_unlock(&ir->lock);
                if (rc == -ENODEV) {
                        rc_unregister_device(ir->rc);
                        ir->rc = NULL;
                        return;
                }
        }

        schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling_interval));
}

static int ir_open(struct rc_dev *dev)
{
        struct IR_i2c *ir = dev->priv;

        schedule_delayed_work(&ir->work, 0);

        return 0;
}

static void ir_close(struct rc_dev *dev)
{
        struct IR_i2c *ir = dev->priv;

        cancel_delayed_work_sync(&ir->work);
}

/* Zilog Transmit Interface */
#define XTAL_FREQ               18432000

#define ZILOG_SEND              0x80
#define ZILOG_UIR_END           0x40
#define ZILOG_INIT_END          0x20
#define ZILOG_LIR_END           0x10

#define ZILOG_STATUS_OK         0x80
#define ZILOG_STATUS_TX         0x40
#define ZILOG_STATUS_SET        0x20

/*
 * As you can see here, very few different lengths of pulse and space
 * can be encoded. This means that the hardware does not work well with
 * recorded IR. It's best to work with generated IR, like from ir-ctl or
 * the in-kernel encoders.
 */
struct code_block {
        u8      length;
        u16     pulse[7];       /* not aligned */
        u8      carrier_pulse;
        u8      carrier_space;
        u16     space[8];       /* not aligned */
        u8      codes[61];
        u8      csum[2];
} __packed;

static int send_data_block(struct IR_i2c *ir, int cmd,
                           struct code_block *code_block)
{
        int i, j, ret;
        u8 buf[5], *p;

        p = &code_block->length;
        for (i = 0; p < code_block->csum; i++)
                code_block->csum[i & 1] ^= *p++;

        p = &code_block->length;

        for (i = 0; i < sizeof(*code_block);) {
                int tosend = sizeof(*code_block) - i;

                if (tosend > 4)
                        tosend = 4;
                buf[0] = i + 1;
                for (j = 0; j < tosend; ++j)
                        buf[1 + j] = p[i + j];
                dev_dbg(&ir->rc->dev, "%*ph", tosend + 1, buf);
                ret = i2c_master_send(ir->tx_c, buf, tosend + 1);
                if (ret != tosend + 1) {
                        dev_dbg(&ir->rc->dev,
                                "i2c_master_send failed with %d\n", ret);
                        return ret < 0 ? ret : -EIO;
                }
                i += tosend;
        }

        buf[0] = 0;
        buf[1] = cmd;
        ret = i2c_master_send(ir->tx_c, buf, 2);
        if (ret != 2) {
                dev_err(&ir->rc->dev, "i2c_master_send failed with %d\n", ret);
                return ret < 0 ? ret : -EIO;
        }

        usleep_range(2000, 5000);

        ret = i2c_master_send(ir->tx_c, buf, 1);
        if (ret != 1) {
                dev_err(&ir->rc->dev, "i2c_master_send failed with %d\n", ret);
                return ret < 0 ? ret : -EIO;
        }

        return 0;
}

static int zilog_init(struct IR_i2c *ir)
{
        struct code_block code_block = { .length = sizeof(code_block) };
        u8 buf[4];
        int ret;

        put_unaligned_be16(0x1000, &code_block.pulse[3]);

        ret = send_data_block(ir, ZILOG_INIT_END, &code_block);
        if (ret)
                return ret;

        ret = i2c_master_recv(ir->tx_c, buf, 4);
        if (ret != 4) {
                dev_err(&ir->c->dev, "failed to retrieve firmware version: %d\n",
                        ret);
                return ret < 0 ? ret : -EIO;
        }

        dev_info(&ir->c->dev, "Zilog/Hauppauge IR blaster firmware version %d.%d.%d\n",
                 buf[1], buf[2], buf[3]);

        return 0;
}

/*
 * If the last slot for pulse is the same as the current slot for pulse,
 * then use slot no 7.
 */
static void copy_codes(u8 *dst, u8 *src, unsigned int count)
{
        u8 c, last = 0xff;

        while (count--) {
                c = *src++;
                if ((c & 0xf0) == last) {
                        *dst++ = 0x70 | (c & 0xf);
                } else {
                        *dst++ = c;
                        last = c & 0xf0;
                }
        }
}

/*
 * When looking for repeats, we don't care about the trailing space. This
 * is set to the shortest possible anyway.
 */
static int cmp_no_trail(u8 *a, u8 *b, unsigned int count)
{
        while (--count) {
                if (*a++ != *b++)
                        return 1;
        }

        return (*a & 0xf0) - (*b & 0xf0);
}

static int find_slot(u16 *array, unsigned int size, u16 val)
{
        int i;

        for (i = 0; i < size; i++) {
                if (get_unaligned_be16(&array[i]) == val) {
                        return i;
                } else if (!array[i]) {
                        put_unaligned_be16(val, &array[i]);
                        return i;
                }
        }

        return -1;
}

static int zilog_ir_format(struct rc_dev *rcdev, unsigned int *txbuf,
                           unsigned int count, struct code_block *code_block)
{
        struct IR_i2c *ir = rcdev->priv;
        int rep, i, l, p = 0, s, c = 0;
        bool repeating;
        u8 codes[174];

        code_block->carrier_pulse = DIV_ROUND_CLOSEST(
                        ir->duty_cycle * XTAL_FREQ / 1000, ir->carrier);
        code_block->carrier_space = DIV_ROUND_CLOSEST(
                        (100 - ir->duty_cycle) * XTAL_FREQ / 1000, ir->carrier);

        for (i = 0; i < count; i++) {
                if (c >= ARRAY_SIZE(codes) - 1) {
                        dev_warn(&rcdev->dev, "IR too long, cannot transmit\n");
                        return -EINVAL;
                }

                /*
                 * Lengths more than 142220us cannot be encoded; also
                 * this checks for multiply overflow
                 */
                if (txbuf[i] > 142220)
                        return -EINVAL;

                l = DIV_ROUND_CLOSEST((XTAL_FREQ / 1000) * txbuf[i], 40000);

                if (i & 1) {
                        s = find_slot(code_block->space,
                                      ARRAY_SIZE(code_block->space), l);
                        if (s == -1) {
                                dev_warn(&rcdev->dev, "Too many different lengths spaces, cannot transmit");
                                return -EINVAL;
                        }

                        /* We have a pulse and space */
                        codes[c++] = (p << 4) | s;
                } else {
                        p = find_slot(code_block->pulse,
                                      ARRAY_SIZE(code_block->pulse), l);
                        if (p == -1) {
                                dev_warn(&rcdev->dev, "Too many different lengths pulses, cannot transmit");
                                return -EINVAL;
                        }
                }
        }

        /* We have to encode the trailing pulse. Find the shortest space */
        s = 0;
        for (i = 1; i < ARRAY_SIZE(code_block->space); i++) {
                u16 d = get_unaligned_be16(&code_block->space[i]);

                if (get_unaligned_be16(&code_block->space[s]) > d)
                        s = i;
        }

        codes[c++] = (p << 4) | s;

        dev_dbg(&rcdev->dev, "generated %d codes\n", c);

        /*
         * Are the last N codes (so pulse + space) repeating 3 times?
         * if so we can shorten the codes list and use code 0xc0 to repeat
         * them.
         */
        repeating = false;

        for (rep = c / 3; rep >= 1; rep--) {
                if (!memcmp(&codes[c - rep * 3], &codes[c - rep * 2], rep) &&
                    !cmp_no_trail(&codes[c - rep], &codes[c - rep * 2], rep)) {
                        repeating = true;
                        break;
                }
        }

        if (repeating) {
                /* first copy any leading non-repeating */
                int leading = c - rep * 3;

                if (leading >= ARRAY_SIZE(code_block->codes) - 3 - rep) {
                        dev_warn(&rcdev->dev, "IR too long, cannot transmit\n");
                        return -EINVAL;
                }

                dev_dbg(&rcdev->dev, "found trailing %d repeat\n", rep);
                copy_codes(code_block->codes, codes, leading);
                code_block->codes[leading] = 0x82;
                copy_codes(code_block->codes + leading + 1, codes + leading,
                           rep);
                c = leading + 1 + rep;
                code_block->codes[c++] = 0xc0;
        } else {
                if (c >= ARRAY_SIZE(code_block->codes) - 3) {
                        dev_warn(&rcdev->dev, "IR too long, cannot transmit\n");
                        return -EINVAL;
                }

                dev_dbg(&rcdev->dev, "found no trailing repeat\n");
                code_block->codes[0] = 0x82;
                copy_codes(code_block->codes + 1, codes, c);
                c++;
                code_block->codes[c++] = 0xc4;
        }

        while (c < ARRAY_SIZE(code_block->codes))
                code_block->codes[c++] = 0x83;

        return 0;
}

static int zilog_tx(struct rc_dev *rcdev, unsigned int *txbuf,
                    unsigned int count)
{
        struct IR_i2c *ir = rcdev->priv;
        struct code_block code_block = { .length = sizeof(code_block) };
        u8 buf[2];
        int ret, i;

        ret = zilog_ir_format(rcdev, txbuf, count, &code_block);
        if (ret)
                return ret;

        ret = mutex_lock_interruptible(&ir->lock);
        if (ret)
                return ret;

        ret = send_data_block(ir, ZILOG_UIR_END, &code_block);
        if (ret)
                goto out_unlock;

        ret = i2c_master_recv(ir->tx_c, buf, 1);
        if (ret != 1) {
                dev_err(&ir->rc->dev, "i2c_master_recv failed with %d\n", ret);
                goto out_unlock;
        }

        dev_dbg(&ir->rc->dev, "code set status: %02x\n", buf[0]);

        if (buf[0] != (ZILOG_STATUS_OK | ZILOG_STATUS_SET)) {
                dev_err(&ir->rc->dev, "unexpected IR TX response %02x\n",
                        buf[0]);
                ret = -EIO;
                goto out_unlock;
        }

        buf[0] = 0x00;
        buf[1] = ZILOG_SEND;

        ret = i2c_master_send(ir->tx_c, buf, 2);
        if (ret != 2) {
                dev_err(&ir->rc->dev, "i2c_master_send failed with %d\n", ret);
                if (ret >= 0)
                        ret = -EIO;
                goto out_unlock;
        }

        dev_dbg(&ir->rc->dev, "send command sent\n");

        /*
         * This bit NAKs until the device is ready, so we retry it
         * sleeping a bit each time.  This seems to be what the windows
         * driver does, approximately.
         * Try for up to 1s.
         */
        for (i = 0; i < 20; ++i) {
                set_current_state(TASK_UNINTERRUPTIBLE);
                schedule_timeout(msecs_to_jiffies(50));
                ret = i2c_master_send(ir->tx_c, buf, 1);
                if (ret == 1)
                        break;
                dev_dbg(&ir->rc->dev,
                        "NAK expected: i2c_master_send failed with %d (try %d)\n",
                        ret, i + 1);
        }

        if (ret != 1) {
                dev_err(&ir->rc->dev,
                        "IR TX chip never got ready: last i2c_master_send failed with %d\n",
                        ret);
                if (ret >= 0)
                        ret = -EIO;
                goto out_unlock;
        }

        ret = i2c_master_recv(ir->tx_c, buf, 1);
        if (ret != 1) {
                dev_err(&ir->rc->dev, "i2c_master_recv failed with %d\n", ret);
                ret = -EIO;
                goto out_unlock;
        } else if (buf[0] != ZILOG_STATUS_OK) {
                dev_err(&ir->rc->dev, "unexpected IR TX response #2: %02x\n",
                        buf[0]);
                ret = -EIO;
                goto out_unlock;
        }
        dev_dbg(&ir->rc->dev, "transmit complete\n");

        /* Oh good, it worked */
        ret = count;
out_unlock:
        mutex_unlock(&ir->lock);

        return ret;
}

static int zilog_tx_carrier(struct rc_dev *dev, u32 carrier)
{
        struct IR_i2c *ir = dev->priv;

        if (carrier > 500000 || carrier < 20000)
                return -EINVAL;

        ir->carrier = carrier;

        return 0;
}

static int zilog_tx_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
{
        struct IR_i2c *ir = dev->priv;

        ir->duty_cycle = duty_cycle;

        return 0;
}

static int ir_probe(struct i2c_client *client)
{
        const struct i2c_device_id *id = i2c_client_get_device_id(client);
        char *ir_codes = NULL;
        const char *name = NULL;
        u64 rc_proto = RC_PROTO_BIT_UNKNOWN;
        struct IR_i2c *ir;
        struct rc_dev *rc = NULL;
        struct i2c_adapter *adap = client->adapter;
        unsigned short addr = client->addr;
        bool probe_tx = (id->driver_data & FLAG_TX) != 0;
        int err;

        if ((id->driver_data & FLAG_HDPVR) && !enable_hdpvr) {
                dev_err(&client->dev, "IR for HDPVR is known to cause problems during recording, use enable_hdpvr modparam to enable\n");
                return -ENODEV;
        }

        ir = devm_kzalloc(&client->dev, sizeof(*ir), GFP_KERNEL);
        if (!ir)
                return -ENOMEM;

        ir->c = client;
        ir->polling_interval = DEFAULT_POLLING_INTERVAL;
        i2c_set_clientdata(client, ir);

        switch(addr) {
        case 0x64:
                name        = "Pixelview";
                ir->get_key = get_key_pixelview;
                rc_proto    = RC_PROTO_BIT_OTHER;
                ir_codes    = RC_MAP_EMPTY;
                break;
        case 0x18:
        case 0x1f:
        case 0x1a:
                name        = "Hauppauge";
                ir->get_key = get_key_haup;
                rc_proto    = RC_PROTO_BIT_RC5;
                ir_codes    = RC_MAP_HAUPPAUGE;
                break;
        case 0x30:
                name        = "KNC One";
                ir->get_key = get_key_knc1;
                rc_proto    = RC_PROTO_BIT_OTHER;
                ir_codes    = RC_MAP_EMPTY;
                break;
        case 0x33:
                name        = "Geniatech";
                ir->get_key = get_key_geniatech;
                rc_proto    = RC_PROTO_BIT_RC5;
                ir_codes    = RC_MAP_TOTAL_MEDIA_IN_HAND_02;
                ir->old     = 0xfc;
                break;
        case 0x6b:
                name        = "FusionHDTV";
                ir->get_key = get_key_fusionhdtv;
                rc_proto    = RC_PROTO_BIT_UNKNOWN;
                ir_codes    = RC_MAP_FUSIONHDTV_MCE;
                break;
        case 0x40:
                name        = "AVerMedia Cardbus remote";
                ir->get_key = get_key_avermedia_cardbus;
                rc_proto    = RC_PROTO_BIT_OTHER;
                ir_codes    = RC_MAP_AVERMEDIA_CARDBUS;
                break;
        case 0x41:
                name        = "AVerMedia EM78P153";
                ir->get_key = get_key_avermedia_cardbus;
                rc_proto    = RC_PROTO_BIT_OTHER;
                /* RM-KV remote, seems to be same as RM-K6 */
                ir_codes    = RC_MAP_AVERMEDIA_M733A_RM_K6;
                break;
        case 0x71:
                name        = "Hauppauge/Zilog Z8";
                ir->get_key = get_key_haup_xvr;
                rc_proto    = RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC6_MCE |
                                                        RC_PROTO_BIT_RC6_6A_32;
                ir_codes    = RC_MAP_HAUPPAUGE;
                ir->polling_interval = 125;
                probe_tx = true;
                break;
        }

        /* Let the caller override settings */
        if (client->dev.platform_data) {
                const struct IR_i2c_init_data *init_data =
                                                client->dev.platform_data;

                ir_codes = init_data->ir_codes;
                rc = init_data->rc_dev;

                name = init_data->name;
                if (init_data->type)
                        rc_proto = init_data->type;

                if (init_data->polling_interval)
                        ir->polling_interval = init_data->polling_interval;

                switch (init_data->internal_get_key_func) {
                case IR_KBD_GET_KEY_CUSTOM:
                        /* The bridge driver provided us its own function */
                        ir->get_key = init_data->get_key;
                        break;
                case IR_KBD_GET_KEY_PIXELVIEW:
                        ir->get_key = get_key_pixelview;
                        break;
                case IR_KBD_GET_KEY_HAUP:
                        ir->get_key = get_key_haup;
                        break;
                case IR_KBD_GET_KEY_KNC1:
                        ir->get_key = get_key_knc1;
                        break;
                case IR_KBD_GET_KEY_GENIATECH:
                        ir->get_key = get_key_geniatech;
                        break;
                case IR_KBD_GET_KEY_FUSIONHDTV:
                        ir->get_key = get_key_fusionhdtv;
                        break;
                case IR_KBD_GET_KEY_HAUP_XVR:
                        ir->get_key = get_key_haup_xvr;
                        break;
                case IR_KBD_GET_KEY_AVERMEDIA_CARDBUS:
                        ir->get_key = get_key_avermedia_cardbus;
                        break;
                }
        }

        if (!rc) {
                /*
                 * If platform_data doesn't specify rc_dev, initialize it
                 * internally
                 */
                rc = rc_allocate_device(RC_DRIVER_SCANCODE);
                if (!rc)
                        return -ENOMEM;
        }
        ir->rc = rc;

        /* Make sure we are all setup before going on */
        if (!name || !ir->get_key || !rc_proto || !ir_codes) {
                dev_warn(&client->dev, "Unsupported device at address 0x%02x\n",
                         addr);
                err = -ENODEV;
                goto err_out_free;
        }

        ir->ir_codes = ir_codes;

        snprintf(ir->phys, sizeof(ir->phys), "%s/%s", dev_name(&adap->dev),
                 dev_name(&client->dev));

        /*
         * Initialize input_dev fields
         * It doesn't make sense to allow overriding them via platform_data
         */
        rc->input_id.bustype = BUS_I2C;
        rc->input_phys       = ir->phys;
        rc->device_name      = name;
        rc->dev.parent       = &client->dev;
        rc->priv             = ir;
        rc->open             = ir_open;
        rc->close            = ir_close;

        /*
         * Initialize the other fields of rc_dev
         */
        rc->map_name       = ir->ir_codes;
        rc->allowed_protocols = rc_proto;
        if (!rc->driver_name)
                rc->driver_name = KBUILD_MODNAME;

        mutex_init(&ir->lock);

        INIT_DELAYED_WORK(&ir->work, ir_work);

        if (probe_tx) {
                ir->tx_c = i2c_new_dummy_device(client->adapter, 0x70);
                if (IS_ERR(ir->tx_c)) {
                        dev_err(&client->dev, "failed to setup tx i2c address");
                        err = PTR_ERR(ir->tx_c);
                        goto err_out_free;
                } else if (!zilog_init(ir)) {
                        ir->carrier = 38000;
                        ir->duty_cycle = 40;
                        rc->tx_ir = zilog_tx;
                        rc->s_tx_carrier = zilog_tx_carrier;
                        rc->s_tx_duty_cycle = zilog_tx_duty_cycle;
                }
        }

        err = rc_register_device(rc);
        if (err)
                goto err_out_free;

        return 0;

 err_out_free:
        if (!IS_ERR(ir->tx_c))
                i2c_unregister_device(ir->tx_c);

        /* Only frees rc if it were allocated internally */
        rc_free_device(rc);
        return err;
}

static void ir_remove(struct i2c_client *client)
{
        struct IR_i2c *ir = i2c_get_clientdata(client);

        cancel_delayed_work_sync(&ir->work);

        i2c_unregister_device(ir->tx_c);

        rc_unregister_device(ir->rc);
}

static const struct i2c_device_id ir_kbd_id[] = {
        /* Generic entry for any IR receiver */
        { "ir_video", 0 },
        /* IR device specific entries should be added here */
        { "ir_z8f0811_haup", FLAG_TX },
        { "ir_z8f0811_hdpvr", FLAG_TX | FLAG_HDPVR },
        { }
};
MODULE_DEVICE_TABLE(i2c, ir_kbd_id);

static struct i2c_driver ir_kbd_driver = {
        .driver = {
                .name   = "ir-kbd-i2c",
        },
        .probe          = ir_probe,
        .remove         = ir_remove,
        .id_table       = ir_kbd_id,
};

module_i2c_driver(ir_kbd_driver);

/* ----------------------------------------------------------------------- */

MODULE_AUTHOR("Gerd Knorr, Michal Kochanowicz, Christoph Bartelmus, Ulrich Mueller");
MODULE_DESCRIPTION("input driver for i2c IR remote controls");
MODULE_LICENSE("GPL");