// SPDX-License-Identifier: GPL-2.0-only
/*
 * Base driver for Maxim MAX8925
 *
 * Copyright (C) 2009-2010 Marvell International Ltd.
 *      Haojian Zhuang <haojian.zhuang@marvell.com>
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/platform_device.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max8925.h>
#include <linux/of.h>

static const struct resource bk_resources[] = {
        { 0x84, 0x84, "mode control", IORESOURCE_REG, },
        { 0x85, 0x85, "control",      IORESOURCE_REG, },
};

static struct mfd_cell bk_devs[] = {
        {
                .name           = "max8925-backlight",
                .num_resources  = ARRAY_SIZE(bk_resources),
                .resources      = &bk_resources[0],
                .id             = -1,
        },
};

static const struct resource touch_resources[] = {
        {
                .name   = "max8925-tsc",
                .start  = MAX8925_TSC_IRQ,
                .end    = MAX8925_ADC_RES_END,
                .flags  = IORESOURCE_REG,
        },
};

static const struct mfd_cell touch_devs[] = {
        {
                .name           = "max8925-touch",
                .num_resources  = 1,
                .resources      = &touch_resources[0],
                .id             = -1,
        },
};

static const struct resource power_supply_resources[] = {
        {
                .name   = "max8925-power",
                .start  = MAX8925_CHG_IRQ1,
                .end    = MAX8925_CHG_IRQ1_MASK,
                .flags  = IORESOURCE_REG,
        },
};

static const struct mfd_cell power_devs[] = {
        {
                .name           = "max8925-power",
                .num_resources  = 1,
                .resources      = &power_supply_resources[0],
                .id             = -1,
        },
};

static const struct resource rtc_resources[] = {
        {
                .name   = "max8925-rtc",
                .start  = MAX8925_IRQ_RTC_ALARM0,
                .end    = MAX8925_IRQ_RTC_ALARM0,
                .flags  = IORESOURCE_IRQ,
        },
};

static const struct mfd_cell rtc_devs[] = {
        {
                .name           = "max8925-rtc",
                .num_resources  = 1,
                .resources      = &rtc_resources[0],
                .id             = -1,
        },
};

static const struct resource onkey_resources[] = {
        {
                .name   = "max8925-onkey",
                .start  = MAX8925_IRQ_GPM_SW_R,
                .end    = MAX8925_IRQ_GPM_SW_R,
                .flags  = IORESOURCE_IRQ,
        }, {
                .name   = "max8925-onkey",
                .start  = MAX8925_IRQ_GPM_SW_F,
                .end    = MAX8925_IRQ_GPM_SW_F,
                .flags  = IORESOURCE_IRQ,
        },
};

static const struct mfd_cell onkey_devs[] = {
        {
                .name           = "max8925-onkey",
                .num_resources  = 2,
                .resources      = &onkey_resources[0],
                .id             = -1,
        },
};

static const struct resource sd1_resources[] = {
        {0x06, 0x06, "sdv", IORESOURCE_REG, },
};

static const struct resource sd2_resources[] = {
        {0x09, 0x09, "sdv", IORESOURCE_REG, },
};

static const struct resource sd3_resources[] = {
        {0x0c, 0x0c, "sdv", IORESOURCE_REG, },
};

static const struct resource ldo1_resources[] = {
        {0x1a, 0x1a, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo2_resources[] = {
        {0x1e, 0x1e, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo3_resources[] = {
        {0x22, 0x22, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo4_resources[] = {
        {0x26, 0x26, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo5_resources[] = {
        {0x2a, 0x2a, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo6_resources[] = {
        {0x2e, 0x2e, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo7_resources[] = {
        {0x32, 0x32, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo8_resources[] = {
        {0x36, 0x36, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo9_resources[] = {
        {0x3a, 0x3a, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo10_resources[] = {
        {0x3e, 0x3e, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo11_resources[] = {
        {0x42, 0x42, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo12_resources[] = {
        {0x46, 0x46, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo13_resources[] = {
        {0x4a, 0x4a, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo14_resources[] = {
        {0x4e, 0x4e, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo15_resources[] = {
        {0x52, 0x52, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo16_resources[] = {
        {0x12, 0x12, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo17_resources[] = {
        {0x16, 0x16, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo18_resources[] = {
        {0x74, 0x74, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo19_resources[] = {
        {0x5e, 0x5e, "ldov", IORESOURCE_REG, },
};

static const struct resource ldo20_resources[] = {
        {0x9e, 0x9e, "ldov", IORESOURCE_REG, },
};

static struct mfd_cell reg_devs[] = {
        {
                .name = "max8925-regulator",
                .id = 0,
                .num_resources = ARRAY_SIZE(sd1_resources),
                .resources = sd1_resources,
        }, {
                .name = "max8925-regulator",
                .id = 1,
                .num_resources = ARRAY_SIZE(sd2_resources),
                .resources = sd2_resources,
        }, {
                .name = "max8925-regulator",
                .id = 2,
                .num_resources = ARRAY_SIZE(sd3_resources),
                .resources = sd3_resources,
        }, {
                .name = "max8925-regulator",
                .id = 3,
                .num_resources = ARRAY_SIZE(ldo1_resources),
                .resources = ldo1_resources,
        }, {
                .name = "max8925-regulator",
                .id = 4,
                .num_resources = ARRAY_SIZE(ldo2_resources),
                .resources = ldo2_resources,
        }, {
                .name = "max8925-regulator",
                .id = 5,
                .num_resources = ARRAY_SIZE(ldo3_resources),
                .resources = ldo3_resources,
        }, {
                .name = "max8925-regulator",
                .id = 6,
                .num_resources = ARRAY_SIZE(ldo4_resources),
                .resources = ldo4_resources,
        }, {
                .name = "max8925-regulator",
                .id = 7,
                .num_resources = ARRAY_SIZE(ldo5_resources),
                .resources = ldo5_resources,
        }, {
                .name = "max8925-regulator",
                .id = 8,
                .num_resources = ARRAY_SIZE(ldo6_resources),
                .resources = ldo6_resources,
        }, {
                .name = "max8925-regulator",
                .id = 9,
                .num_resources = ARRAY_SIZE(ldo7_resources),
                .resources = ldo7_resources,
        }, {
                .name = "max8925-regulator",
                .id = 10,
                .num_resources = ARRAY_SIZE(ldo8_resources),
                .resources = ldo8_resources,
        }, {
                .name = "max8925-regulator",
                .id = 11,
                .num_resources = ARRAY_SIZE(ldo9_resources),
                .resources = ldo9_resources,
        }, {
                .name = "max8925-regulator",
                .id = 12,
                .num_resources = ARRAY_SIZE(ldo10_resources),
                .resources = ldo10_resources,
        }, {
                .name = "max8925-regulator",
                .id = 13,
                .num_resources = ARRAY_SIZE(ldo11_resources),
                .resources = ldo11_resources,
        }, {
                .name = "max8925-regulator",
                .id = 14,
                .num_resources = ARRAY_SIZE(ldo12_resources),
                .resources = ldo12_resources,
        }, {
                .name = "max8925-regulator",
                .id = 15,
                .num_resources = ARRAY_SIZE(ldo13_resources),
                .resources = ldo13_resources,
        }, {
                .name = "max8925-regulator",
                .id = 16,
                .num_resources = ARRAY_SIZE(ldo14_resources),
                .resources = ldo14_resources,
        }, {
                .name = "max8925-regulator",
                .id = 17,
                .num_resources = ARRAY_SIZE(ldo15_resources),
                .resources = ldo15_resources,
        }, {
                .name = "max8925-regulator",
                .id = 18,
                .num_resources = ARRAY_SIZE(ldo16_resources),
                .resources = ldo16_resources,
        }, {
                .name = "max8925-regulator",
                .id = 19,
                .num_resources = ARRAY_SIZE(ldo17_resources),
                .resources = ldo17_resources,
        }, {
                .name = "max8925-regulator",
                .id = 20,
                .num_resources = ARRAY_SIZE(ldo18_resources),
                .resources = ldo18_resources,
        }, {
                .name = "max8925-regulator",
                .id = 21,
                .num_resources = ARRAY_SIZE(ldo19_resources),
                .resources = ldo19_resources,
        }, {
                .name = "max8925-regulator",
                .id = 22,
                .num_resources = ARRAY_SIZE(ldo20_resources),
                .resources = ldo20_resources,
        },
};

enum {
        FLAGS_ADC = 1,  /* register in ADC component */
        FLAGS_RTC,      /* register in RTC component */
};

struct max8925_irq_data {
        int     reg;
        int     mask_reg;
        int     enable;         /* enable or not */
        int     offs;           /* bit offset in mask register */
        int     flags;
        int     tsc_irq;
};

static struct max8925_irq_data max8925_irqs[] = {
        [MAX8925_IRQ_VCHG_DC_OVP] = {
                .reg            = MAX8925_CHG_IRQ1,
                .mask_reg       = MAX8925_CHG_IRQ1_MASK,
                .offs           = 1 << 0,
        },
        [MAX8925_IRQ_VCHG_DC_F] = {
                .reg            = MAX8925_CHG_IRQ1,
                .mask_reg       = MAX8925_CHG_IRQ1_MASK,
                .offs           = 1 << 1,
        },
        [MAX8925_IRQ_VCHG_DC_R] = {
                .reg            = MAX8925_CHG_IRQ1,
                .mask_reg       = MAX8925_CHG_IRQ1_MASK,
                .offs           = 1 << 2,
        },
        [MAX8925_IRQ_VCHG_THM_OK_R] = {
                .reg            = MAX8925_CHG_IRQ2,
                .mask_reg       = MAX8925_CHG_IRQ2_MASK,
                .offs           = 1 << 0,
        },
        [MAX8925_IRQ_VCHG_THM_OK_F] = {
                .reg            = MAX8925_CHG_IRQ2,
                .mask_reg       = MAX8925_CHG_IRQ2_MASK,
                .offs           = 1 << 1,
        },
        [MAX8925_IRQ_VCHG_SYSLOW_F] = {
                .reg            = MAX8925_CHG_IRQ2,
                .mask_reg       = MAX8925_CHG_IRQ2_MASK,
                .offs           = 1 << 2,
        },
        [MAX8925_IRQ_VCHG_SYSLOW_R] = {
                .reg            = MAX8925_CHG_IRQ2,
                .mask_reg       = MAX8925_CHG_IRQ2_MASK,
                .offs           = 1 << 3,
        },
        [MAX8925_IRQ_VCHG_RST] = {
                .reg            = MAX8925_CHG_IRQ2,
                .mask_reg       = MAX8925_CHG_IRQ2_MASK,
                .offs           = 1 << 4,
        },
        [MAX8925_IRQ_VCHG_DONE] = {
                .reg            = MAX8925_CHG_IRQ2,
                .mask_reg       = MAX8925_CHG_IRQ2_MASK,
                .offs           = 1 << 5,
        },
        [MAX8925_IRQ_VCHG_TOPOFF] = {
                .reg            = MAX8925_CHG_IRQ2,
                .mask_reg       = MAX8925_CHG_IRQ2_MASK,
                .offs           = 1 << 6,
        },
        [MAX8925_IRQ_VCHG_TMR_FAULT] = {
                .reg            = MAX8925_CHG_IRQ2,
                .mask_reg       = MAX8925_CHG_IRQ2_MASK,
                .offs           = 1 << 7,
        },
        [MAX8925_IRQ_GPM_RSTIN] = {
                .reg            = MAX8925_ON_OFF_IRQ1,
                .mask_reg       = MAX8925_ON_OFF_IRQ1_MASK,
                .offs           = 1 << 0,
        },
        [MAX8925_IRQ_GPM_MPL] = {
                .reg            = MAX8925_ON_OFF_IRQ1,
                .mask_reg       = MAX8925_ON_OFF_IRQ1_MASK,
                .offs           = 1 << 1,
        },
        [MAX8925_IRQ_GPM_SW_3SEC] = {
                .reg            = MAX8925_ON_OFF_IRQ1,
                .mask_reg       = MAX8925_ON_OFF_IRQ1_MASK,
                .offs           = 1 << 2,
        },
        [MAX8925_IRQ_GPM_EXTON_F] = {
                .reg            = MAX8925_ON_OFF_IRQ1,
                .mask_reg       = MAX8925_ON_OFF_IRQ1_MASK,
                .offs           = 1 << 3,
        },
        [MAX8925_IRQ_GPM_EXTON_R] = {
                .reg            = MAX8925_ON_OFF_IRQ1,
                .mask_reg       = MAX8925_ON_OFF_IRQ1_MASK,
                .offs           = 1 << 4,
        },
        [MAX8925_IRQ_GPM_SW_1SEC] = {
                .reg            = MAX8925_ON_OFF_IRQ1,
                .mask_reg       = MAX8925_ON_OFF_IRQ1_MASK,
                .offs           = 1 << 5,
        },
        [MAX8925_IRQ_GPM_SW_F] = {
                .reg            = MAX8925_ON_OFF_IRQ1,
                .mask_reg       = MAX8925_ON_OFF_IRQ1_MASK,
                .offs           = 1 << 6,
        },
        [MAX8925_IRQ_GPM_SW_R] = {
                .reg            = MAX8925_ON_OFF_IRQ1,
                .mask_reg       = MAX8925_ON_OFF_IRQ1_MASK,
                .offs           = 1 << 7,
        },
        [MAX8925_IRQ_GPM_SYSCKEN_F] = {
                .reg            = MAX8925_ON_OFF_IRQ2,
                .mask_reg       = MAX8925_ON_OFF_IRQ2_MASK,
                .offs           = 1 << 0,
        },
        [MAX8925_IRQ_GPM_SYSCKEN_R] = {
                .reg            = MAX8925_ON_OFF_IRQ2,
                .mask_reg       = MAX8925_ON_OFF_IRQ2_MASK,
                .offs           = 1 << 1,
        },
        [MAX8925_IRQ_RTC_ALARM1] = {
                .reg            = MAX8925_RTC_IRQ,
                .mask_reg       = MAX8925_RTC_IRQ_MASK,
                .offs           = 1 << 2,
                .flags          = FLAGS_RTC,
        },
        [MAX8925_IRQ_RTC_ALARM0] = {
                .reg            = MAX8925_RTC_IRQ,
                .mask_reg       = MAX8925_RTC_IRQ_MASK,
                .offs           = 1 << 3,
                .flags          = FLAGS_RTC,
        },
        [MAX8925_IRQ_TSC_STICK] = {
                .reg            = MAX8925_TSC_IRQ,
                .mask_reg       = MAX8925_TSC_IRQ_MASK,
                .offs           = 1 << 0,
                .flags          = FLAGS_ADC,
                .tsc_irq        = 1,
        },
        [MAX8925_IRQ_TSC_NSTICK] = {
                .reg            = MAX8925_TSC_IRQ,
                .mask_reg       = MAX8925_TSC_IRQ_MASK,
                .offs           = 1 << 1,
                .flags          = FLAGS_ADC,
                .tsc_irq        = 1,
        },
};

static irqreturn_t max8925_irq(int irq, void *data)
{
        struct max8925_chip *chip = data;
        struct max8925_irq_data *irq_data;
        struct i2c_client *i2c;
        int read_reg = -1, value = 0;
        int i;

        for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
                irq_data = &max8925_irqs[i];
                /* TSC IRQ should be serviced in max8925_tsc_irq() */
                if (irq_data->tsc_irq)
                        continue;
                if (irq_data->flags == FLAGS_RTC)
                        i2c = chip->rtc;
                else if (irq_data->flags == FLAGS_ADC)
                        i2c = chip->adc;
                else
                        i2c = chip->i2c;
                if (read_reg != irq_data->reg) {
                        read_reg = irq_data->reg;
                        value = max8925_reg_read(i2c, irq_data->reg);
                }
                if (value & irq_data->enable)
                        handle_nested_irq(chip->irq_base + i);
        }
        return IRQ_HANDLED;
}

static irqreturn_t max8925_tsc_irq(int irq, void *data)
{
        struct max8925_chip *chip = data;
        struct max8925_irq_data *irq_data;
        struct i2c_client *i2c;
        int read_reg = -1, value = 0;
        int i;

        for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
                irq_data = &max8925_irqs[i];
                /* non TSC IRQ should be serviced in max8925_irq() */
                if (!irq_data->tsc_irq)
                        continue;
                if (irq_data->flags == FLAGS_RTC)
                        i2c = chip->rtc;
                else if (irq_data->flags == FLAGS_ADC)
                        i2c = chip->adc;
                else
                        i2c = chip->i2c;
                if (read_reg != irq_data->reg) {
                        read_reg = irq_data->reg;
                        value = max8925_reg_read(i2c, irq_data->reg);
                }
                if (value & irq_data->enable)
                        handle_nested_irq(chip->irq_base + i);
        }
        return IRQ_HANDLED;
}

static void max8925_irq_lock(struct irq_data *data)
{
        struct max8925_chip *chip = irq_data_get_irq_chip_data(data);

        mutex_lock(&chip->irq_lock);
}

static void max8925_irq_sync_unlock(struct irq_data *data)
{
        struct max8925_chip *chip = irq_data_get_irq_chip_data(data);
        struct max8925_irq_data *irq_data;
        static unsigned char cache_chg[2] = {0xff, 0xff};
        static unsigned char cache_on[2] = {0xff, 0xff};
        static unsigned char cache_rtc = 0xff, cache_tsc = 0xff;
        unsigned char irq_chg[2], irq_on[2];
        unsigned char irq_rtc, irq_tsc;
        int i;

        /* Load cached value. In initial, all IRQs are masked */
        irq_chg[0] = cache_chg[0];
        irq_chg[1] = cache_chg[1];
        irq_on[0] = cache_on[0];
        irq_on[1] = cache_on[1];
        irq_rtc = cache_rtc;
        irq_tsc = cache_tsc;
        for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
                irq_data = &max8925_irqs[i];
                /* 1 -- disable, 0 -- enable */
                switch (irq_data->mask_reg) {
                case MAX8925_CHG_IRQ1_MASK:
                        irq_chg[0] &= ~irq_data->enable;
                        break;
                case MAX8925_CHG_IRQ2_MASK:
                        irq_chg[1] &= ~irq_data->enable;
                        break;
                case MAX8925_ON_OFF_IRQ1_MASK:
                        irq_on[0] &= ~irq_data->enable;
                        break;
                case MAX8925_ON_OFF_IRQ2_MASK:
                        irq_on[1] &= ~irq_data->enable;
                        break;
                case MAX8925_RTC_IRQ_MASK:
                        irq_rtc &= ~irq_data->enable;
                        break;
                case MAX8925_TSC_IRQ_MASK:
                        irq_tsc &= ~irq_data->enable;
                        break;
                default:
                        dev_err(chip->dev, "wrong IRQ\n");
                        break;
                }
        }
        /* update mask into registers */
        if (cache_chg[0] != irq_chg[0]) {
                cache_chg[0] = irq_chg[0];
                max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ1_MASK,
                        irq_chg[0]);
        }
        if (cache_chg[1] != irq_chg[1]) {
                cache_chg[1] = irq_chg[1];
                max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ2_MASK,
                        irq_chg[1]);
        }
        if (cache_on[0] != irq_on[0]) {
                cache_on[0] = irq_on[0];
                max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ1_MASK,
                                irq_on[0]);
        }
        if (cache_on[1] != irq_on[1]) {
                cache_on[1] = irq_on[1];
                max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ2_MASK,
                                irq_on[1]);
        }
        if (cache_rtc != irq_rtc) {
                cache_rtc = irq_rtc;
                max8925_reg_write(chip->rtc, MAX8925_RTC_IRQ_MASK, irq_rtc);
        }
        if (cache_tsc != irq_tsc) {
                cache_tsc = irq_tsc;
                max8925_reg_write(chip->adc, MAX8925_TSC_IRQ_MASK, irq_tsc);
        }

        mutex_unlock(&chip->irq_lock);
}

static void max8925_irq_enable(struct irq_data *data)
{
        struct max8925_chip *chip = irq_data_get_irq_chip_data(data);

        max8925_irqs[data->irq - chip->irq_base].enable
                = max8925_irqs[data->irq - chip->irq_base].offs;
}

static void max8925_irq_disable(struct irq_data *data)
{
        struct max8925_chip *chip = irq_data_get_irq_chip_data(data);

        max8925_irqs[data->irq - chip->irq_base].enable = 0;
}

static struct irq_chip max8925_irq_chip = {
        .name           = "max8925",
        .irq_bus_lock   = max8925_irq_lock,
        .irq_bus_sync_unlock = max8925_irq_sync_unlock,
        .irq_enable     = max8925_irq_enable,
        .irq_disable    = max8925_irq_disable,
};

static int max8925_irq_domain_map(struct irq_domain *d, unsigned int virq,
                                 irq_hw_number_t hw)
{
        irq_set_chip_data(virq, d->host_data);
        irq_set_chip_and_handler(virq, &max8925_irq_chip, handle_edge_irq);
        irq_set_nested_thread(virq, 1);
        irq_set_noprobe(virq);

        return 0;
}

static const struct irq_domain_ops max8925_irq_domain_ops = {
        .map    = max8925_irq_domain_map,
        .xlate  = irq_domain_xlate_onetwocell,
};


static int max8925_irq_init(struct max8925_chip *chip, int irq,
                            struct max8925_platform_data *pdata)
{
        unsigned long flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
        int ret;

        /* clear all interrupts */
        max8925_reg_read(chip->i2c, MAX8925_CHG_IRQ1);
        max8925_reg_read(chip->i2c, MAX8925_CHG_IRQ2);
        max8925_reg_read(chip->i2c, MAX8925_ON_OFF_IRQ1);
        max8925_reg_read(chip->i2c, MAX8925_ON_OFF_IRQ2);
        max8925_reg_read(chip->rtc, MAX8925_RTC_IRQ);
        max8925_reg_read(chip->adc, MAX8925_TSC_IRQ);
        /* mask all interrupts except for TSC */
        max8925_reg_write(chip->rtc, MAX8925_ALARM0_CNTL, 0);
        max8925_reg_write(chip->rtc, MAX8925_ALARM1_CNTL, 0);
        max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ1_MASK, 0xff);
        max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ2_MASK, 0xff);
        max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ1_MASK, 0xff);
        max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ2_MASK, 0xff);
        max8925_reg_write(chip->rtc, MAX8925_RTC_IRQ_MASK, 0xff);

        mutex_init(&chip->irq_lock);
        chip->irq_base = irq_alloc_descs(-1, 0, MAX8925_NR_IRQS, 0);
        if (chip->irq_base < 0) {
                dev_err(chip->dev, "Failed to allocate interrupts, ret:%d\n",
                        chip->irq_base);
                return -EBUSY;
        }

        irq_domain_create_legacy(dev_fwnode(chip->dev), MAX8925_NR_IRQS,
                                 chip->irq_base, 0, &max8925_irq_domain_ops,
                                 chip);

        /* request irq handler for pmic main irq*/
        chip->core_irq = irq;
        if (!chip->core_irq)
                return -EBUSY;
        ret = request_threaded_irq(irq, NULL, max8925_irq, flags | IRQF_ONESHOT,
                                   "max8925", chip);
        if (ret) {
                dev_err(chip->dev, "Failed to request core IRQ: %d\n", ret);
                chip->core_irq = 0;
                return -EBUSY;
        }

        /* request irq handler for pmic tsc irq*/

        /* mask TSC interrupt */
        max8925_reg_write(chip->adc, MAX8925_TSC_IRQ_MASK, 0x0f);

        if (!pdata->tsc_irq) {
                dev_warn(chip->dev, "No interrupt support on TSC IRQ\n");
                return 0;
        }
        chip->tsc_irq = pdata->tsc_irq;
        ret = request_threaded_irq(chip->tsc_irq, NULL, max8925_tsc_irq,
                                   flags | IRQF_ONESHOT, "max8925-tsc", chip);
        if (ret) {
                dev_err(chip->dev, "Failed to request TSC IRQ: %d\n", ret);
                chip->tsc_irq = 0;
        }
        return 0;
}

static void init_regulator(struct max8925_chip *chip,
                                     struct max8925_platform_data *pdata)
{
        int ret;

        if (!pdata)
                return;
        if (pdata->sd1) {
                reg_devs[0].platform_data = pdata->sd1;
                reg_devs[0].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->sd2) {
                reg_devs[1].platform_data = pdata->sd2;
                reg_devs[1].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->sd3) {
                reg_devs[2].platform_data = pdata->sd3;
                reg_devs[2].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo1) {
                reg_devs[3].platform_data = pdata->ldo1;
                reg_devs[3].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo2) {
                reg_devs[4].platform_data = pdata->ldo2;
                reg_devs[4].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo3) {
                reg_devs[5].platform_data = pdata->ldo3;
                reg_devs[5].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo4) {
                reg_devs[6].platform_data = pdata->ldo4;
                reg_devs[6].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo5) {
                reg_devs[7].platform_data = pdata->ldo5;
                reg_devs[7].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo6) {
                reg_devs[8].platform_data = pdata->ldo6;
                reg_devs[8].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo7) {
                reg_devs[9].platform_data = pdata->ldo7;
                reg_devs[9].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo8) {
                reg_devs[10].platform_data = pdata->ldo8;
                reg_devs[10].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo9) {
                reg_devs[11].platform_data = pdata->ldo9;
                reg_devs[11].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo10) {
                reg_devs[12].platform_data = pdata->ldo10;
                reg_devs[12].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo11) {
                reg_devs[13].platform_data = pdata->ldo11;
                reg_devs[13].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo12) {
                reg_devs[14].platform_data = pdata->ldo12;
                reg_devs[14].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo13) {
                reg_devs[15].platform_data = pdata->ldo13;
                reg_devs[15].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo14) {
                reg_devs[16].platform_data = pdata->ldo14;
                reg_devs[16].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo15) {
                reg_devs[17].platform_data = pdata->ldo15;
                reg_devs[17].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo16) {
                reg_devs[18].platform_data = pdata->ldo16;
                reg_devs[18].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo17) {
                reg_devs[19].platform_data = pdata->ldo17;
                reg_devs[19].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo18) {
                reg_devs[20].platform_data = pdata->ldo18;
                reg_devs[20].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo19) {
                reg_devs[21].platform_data = pdata->ldo19;
                reg_devs[21].pdata_size = sizeof(struct regulator_init_data);
        }
        if (pdata->ldo20) {
                reg_devs[22].platform_data = pdata->ldo20;
                reg_devs[22].pdata_size = sizeof(struct regulator_init_data);
        }
        ret = mfd_add_devices(chip->dev, 0, reg_devs, ARRAY_SIZE(reg_devs),
                              NULL, 0, NULL);
        if (ret < 0) {
                dev_err(chip->dev, "Failed to add regulator subdev\n");
                return;
        }
}

int max8925_device_init(struct max8925_chip *chip,
                                  struct max8925_platform_data *pdata)
{
        int ret;

        max8925_irq_init(chip, chip->i2c->irq, pdata);

        if (pdata && (pdata->power || pdata->touch)) {
                /* enable ADC to control internal reference */
                max8925_set_bits(chip->i2c, MAX8925_RESET_CNFG, 1, 1);
                /* enable internal reference for ADC */
                max8925_set_bits(chip->adc, MAX8925_TSC_CNFG1, 3, 2);
                /* check for internal reference IRQ */
                do {
                        ret = max8925_reg_read(chip->adc, MAX8925_TSC_IRQ);
                } while (ret & MAX8925_NREF_OK);
                /* enaable ADC scheduler, interval is 1 second */
                max8925_set_bits(chip->adc, MAX8925_ADC_SCHED, 3, 2);
        }

        /* enable Momentary Power Loss */
        max8925_set_bits(chip->rtc, MAX8925_MPL_CNTL, 1 << 4, 1 << 4);

        ret = mfd_add_devices(chip->dev, 0, &rtc_devs[0],
                              ARRAY_SIZE(rtc_devs),
                              NULL, chip->irq_base, NULL);
        if (ret < 0) {
                dev_err(chip->dev, "Failed to add rtc subdev\n");
                goto out;
        }

        ret = mfd_add_devices(chip->dev, 0, &onkey_devs[0],
                              ARRAY_SIZE(onkey_devs),
                              NULL, chip->irq_base, NULL);
        if (ret < 0) {
                dev_err(chip->dev, "Failed to add onkey subdev\n");
                goto out_dev;
        }

        init_regulator(chip, pdata);

        if (pdata && pdata->backlight) {
                bk_devs[0].platform_data = &pdata->backlight;
                bk_devs[0].pdata_size = sizeof(struct max8925_backlight_pdata);
        }
        ret = mfd_add_devices(chip->dev, 0, bk_devs, ARRAY_SIZE(bk_devs),
                              NULL, 0, NULL);
        if (ret < 0) {
                dev_err(chip->dev, "Failed to add backlight subdev\n");
                goto out_dev;
        }

        ret = mfd_add_devices(chip->dev, 0, &power_devs[0],
                              ARRAY_SIZE(power_devs),
                              NULL, 0, NULL);
        if (ret < 0) {
                dev_err(chip->dev,
                        "Failed to add power supply subdev, err = %d\n", ret);
                goto out_dev;
        }

        if (pdata && pdata->touch) {
                ret = mfd_add_devices(chip->dev, 0, &touch_devs[0],
                                      ARRAY_SIZE(touch_devs),
                                      NULL, chip->tsc_irq, NULL);
                if (ret < 0) {
                        dev_err(chip->dev, "Failed to add touch subdev\n");
                        goto out_dev;
                }
        }

        return 0;
out_dev:
        mfd_remove_devices(chip->dev);
out:
        return ret;
}

void max8925_device_exit(struct max8925_chip *chip)
{
        if (chip->core_irq)
                free_irq(chip->core_irq, chip);
        if (chip->tsc_irq)
                free_irq(chip->tsc_irq, chip);
        mfd_remove_devices(chip->dev);
}