tps65910.c

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/*
 * tps65910.c  --  TI TPS6591x
 *
 * Copyright 2010 Texas Instruments Inc.
 *
 * Author: Graeme Gregory <[email protected]>
 * Author: Jorge Eduardo Candelaria <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under  the terms of the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the License, or (at your
 *  option) any later version.
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/regmap.h>
#include <linux/mfd/tps65910.h>
#include <linux/of_device.h>

static struct resource rtc_resources[] = {
    {
        .start  = TPS65910_IRQ_RTC_ALARM,
        .end    = TPS65910_IRQ_RTC_ALARM,
        .flags  = IORESOURCE_IRQ,
    }
};

static struct mfd_cell tps65910s[] = {
    {
        .name = "tps65910-gpio",
    },
    {
        .name = "tps65910-pmic",
    },
    {
        .name = "tps65910-rtc",
        .num_resources = ARRAY_SIZE(rtc_resources),
        .resources = &rtc_resources[0],
    },
    {
        .name = "tps65910-power",
    },
};


static bool is_volatile_reg(struct device *dev, unsigned int reg)
{
    struct tps65910 *tps65910 = dev_get_drvdata(dev);

    /*
     * Caching all regulator registers.
     * All regualator register address range is same for
     * TPS65910 and TPS65911
     */
    if ((reg >= TPS65910_VIO) && (reg <= TPS65910_VDAC)) {
        /* Check for non-existing register */
        if (tps65910_chip_id(tps65910) == TPS65910)
            if ((reg == TPS65911_VDDCTRL_OP) ||
                (reg == TPS65911_VDDCTRL_SR))
                return true;
        return false;
    }
    return true;
}

static const struct regmap_config tps65910_regmap_config = {
    .reg_bits = 8,
    .val_bits = 8,
    .volatile_reg = is_volatile_reg,
    .max_register = TPS65910_MAX_REGISTER - 1,
    .cache_type = REGCACHE_RBTREE,
};

static int __devinit tps65910_ck32k_init(struct tps65910 *tps65910,
                    struct tps65910_board *pmic_pdata)
{
    int ret;

    if (!pmic_pdata->en_ck32k_xtal)
        return 0;

    ret = tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
                        DEVCTRL_CK32K_CTRL_MASK);
    if (ret < 0) {
        dev_err(tps65910->dev, "clear ck32k_ctrl failed: %d\n", ret);
        return ret;
    }

    return 0;
}

static int __devinit tps65910_sleepinit(struct tps65910 *tps65910,
        struct tps65910_board *pmic_pdata)
{
    struct device *dev = NULL;
    int ret = 0;

    dev = tps65910->dev;

    if (!pmic_pdata->en_dev_slp)
        return 0;

    /* enabling SLEEP device state */
    ret = tps65910_reg_set_bits(tps65910, TPS65910_DEVCTRL,
                DEVCTRL_DEV_SLP_MASK);
    if (ret < 0) {
        dev_err(dev, "set dev_slp failed: %d\n", ret);
        goto err_sleep_init;
    }

    /* Return if there is no sleep keepon data. */
    if (!pmic_pdata->slp_keepon)
        return 0;

    if (pmic_pdata->slp_keepon->therm_keepon) {
        ret = tps65910_reg_set_bits(tps65910,
                TPS65910_SLEEP_KEEP_RES_ON,
                SLEEP_KEEP_RES_ON_THERM_KEEPON_MASK);
        if (ret < 0) {
            dev_err(dev, "set therm_keepon failed: %d\n", ret);
            goto disable_dev_slp;
        }
    }

    if (pmic_pdata->slp_keepon->clkout32k_keepon) {
        ret = tps65910_reg_set_bits(tps65910,
                TPS65910_SLEEP_KEEP_RES_ON,
                SLEEP_KEEP_RES_ON_CLKOUT32K_KEEPON_MASK);
        if (ret < 0) {
            dev_err(dev, "set clkout32k_keepon failed: %d\n", ret);
            goto disable_dev_slp;
        }
    }

    if (pmic_pdata->slp_keepon->i2chs_keepon) {
        ret = tps65910_reg_set_bits(tps65910,
                TPS65910_SLEEP_KEEP_RES_ON,
                SLEEP_KEEP_RES_ON_I2CHS_KEEPON_MASK);
        if (ret < 0) {
            dev_err(dev, "set i2chs_keepon failed: %d\n", ret);
            goto disable_dev_slp;
        }
    }

    return 0;

disable_dev_slp:
    tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
                DEVCTRL_DEV_SLP_MASK);

err_sleep_init:
    return ret;
}

#ifdef CONFIG_OF
static struct of_device_id tps65910_of_match[] = {
    { .compatible = "ti,tps65910", .data = (void *)TPS65910},
    { .compatible = "ti,tps65911", .data = (void *)TPS65911},
    { },
};
MODULE_DEVICE_TABLE(of, tps65910_of_match);

static struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
                        int *chip_id)
{
    struct device_node *np = client->dev.of_node;
    struct tps65910_board *board_info;
    unsigned int prop;
    const struct of_device_id *match;
    int ret = 0;

    match = of_match_device(tps65910_of_match, &client->dev);
    if (!match) {
        dev_err(&client->dev, "Failed to find matching dt id\n");
        return NULL;
    }

    *chip_id  = (int)match->data;

    board_info = devm_kzalloc(&client->dev, sizeof(*board_info),
            GFP_KERNEL);
    if (!board_info) {
        dev_err(&client->dev, "Failed to allocate pdata\n");
        return NULL;
    }

    ret = of_property_read_u32(np, "ti,vmbch-threshold", &prop);
    if (!ret)
        board_info->vmbch_threshold = prop;
    else if (*chip_id == TPS65911)
        dev_warn(&client->dev, "VMBCH-Threshold not specified");

    ret = of_property_read_u32(np, "ti,vmbch2-threshold", &prop);
    if (!ret)
        board_info->vmbch2_threshold = prop;
    else if (*chip_id == TPS65911)
        dev_warn(&client->dev, "VMBCH2-Threshold not specified");

    prop = of_property_read_bool(np, "ti,en-ck32k-xtal");
    board_info->en_ck32k_xtal = prop;

    board_info->irq = client->irq;
    board_info->irq_base = -1;
    board_info->pm_off = of_property_read_bool(np,
            "ti,system-power-controller");

    return board_info;
}
#else
static inline
struct tps65910_board *tps65910_parse_dt(struct i2c_client *client,
                     int *chip_id)
{
    return NULL;
}
#endif

static struct i2c_client *tps65910_i2c_client;
static void tps65910_power_off(void)
{
    struct tps65910 *tps65910;

    tps65910 = dev_get_drvdata(&tps65910_i2c_client->dev);

    if (tps65910_reg_set_bits(tps65910, TPS65910_DEVCTRL,
            DEVCTRL_PWR_OFF_MASK) < 0)
        return;

    tps65910_reg_clear_bits(tps65910, TPS65910_DEVCTRL,
            DEVCTRL_DEV_ON_MASK);
}

static __devinit int tps65910_i2c_probe(struct i2c_client *i2c,
                    const struct i2c_device_id *id)
{
    struct tps65910 *tps65910;
    struct tps65910_board *pmic_plat_data;
    struct tps65910_board *of_pmic_plat_data = NULL;
    struct tps65910_platform_data *init_data;
    int ret = 0;
    int chip_id = id->driver_data;

    pmic_plat_data = dev_get_platdata(&i2c->dev);

    if (!pmic_plat_data && i2c->dev.of_node) {
        pmic_plat_data = tps65910_parse_dt(i2c, &chip_id);
        of_pmic_plat_data = pmic_plat_data;
    }

    if (!pmic_plat_data)
        return -EINVAL;

    init_data = devm_kzalloc(&i2c->dev, sizeof(*init_data), GFP_KERNEL);
    if (init_data == NULL)
        return -ENOMEM;

    tps65910 = devm_kzalloc(&i2c->dev, sizeof(*tps65910), GFP_KERNEL);
    if (tps65910 == NULL)
        return -ENOMEM;

    tps65910->of_plat_data = of_pmic_plat_data;
    i2c_set_clientdata(i2c, tps65910);
    tps65910->dev = &i2c->dev;
    tps65910->i2c_client = i2c;
    tps65910->id = chip_id;
    mutex_init(&tps65910->io_mutex);

    tps65910->regmap = devm_regmap_init_i2c(i2c, &tps65910_regmap_config);
    if (IS_ERR(tps65910->regmap)) {
        ret = PTR_ERR(tps65910->regmap);
        dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
        return ret;
    }

    ret = mfd_add_devices(tps65910->dev, -1,
                  tps65910s, ARRAY_SIZE(tps65910s),
                  NULL, 0, NULL);
    if (ret < 0) {
        dev_err(&i2c->dev, "mfd_add_devices failed: %d\n", ret);
        return ret;
    }

    init_data->irq = pmic_plat_data->irq;
    init_data->irq_base = pmic_plat_data->irq_base;

    tps65910_irq_init(tps65910, init_data->irq, init_data);
    tps65910_ck32k_init(tps65910, pmic_plat_data);
    tps65910_sleepinit(tps65910, pmic_plat_data);

    if (pmic_plat_data->pm_off && !pm_power_off) {
        tps65910_i2c_client = i2c;
        pm_power_off = tps65910_power_off;
    }

    return ret;
}

static __devexit int tps65910_i2c_remove(struct i2c_client *i2c)
{
    struct tps65910 *tps65910 = i2c_get_clientdata(i2c);

    tps65910_irq_exit(tps65910);
    mfd_remove_devices(tps65910->dev);

    return 0;
}

static const struct i2c_device_id tps65910_i2c_id[] = {
       { "tps65910", TPS65910 },
       { "tps65911", TPS65911 },
       { }
};
MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);


static struct i2c_driver tps65910_i2c_driver = {
    .driver = {
           .name = "tps65910",
           .owner = THIS_MODULE,
           .of_match_table = of_match_ptr(tps65910_of_match),
    },
    .probe = tps65910_i2c_probe,
    .remove = __devexit_p(tps65910_i2c_remove),
    .id_table = tps65910_i2c_id,
};

static int __init tps65910_i2c_init(void)
{
    return i2c_add_driver(&tps65910_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(tps65910_i2c_init);

static void __exit tps65910_i2c_exit(void)
{
    i2c_del_driver(&tps65910_i2c_driver);
}
module_exit(tps65910_i2c_exit);

MODULE_AUTHOR("Graeme Gregory <[email protected]>");
MODULE_AUTHOR("Jorge Eduardo Candelaria <[email protected]>");
MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
MODULE_LICENSE("GPL");