alistair23-linux/drivers/mfd/tps65910.c

/*
 * tps65910.c  --  TI TPS6591x
 *
 * Copyright 2010 Texas Instruments Inc.
 *
 * Author: Graeme Gregory <gg@slimlogic.co.uk>
 * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
 *
 *  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/gpio.h>
#include <linux/mfd/core.h>
#include <linux/regmap.h>
#include <linux/mfd/tps65910.h>

static struct mfd_cell tps65910s[] = {
	{
		.name = "tps65910-pmic",
	},
	{
		.name = "tps65910-rtc",
	},
	{
		.name = "tps65910-power",
	},
};


static int tps65910_i2c_read(struct tps65910 *tps65910, u8 reg,
				  int bytes, void *dest)
{
	return regmap_bulk_read(tps65910->regmap, reg, dest, bytes);
}

static int tps65910_i2c_write(struct tps65910 *tps65910, u8 reg,
				  int bytes, void *src)
{
	return regmap_bulk_write(tps65910->regmap, reg, src, bytes);
}

int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
{
	return regmap_update_bits(tps65910->regmap, reg, mask, mask);
}
EXPORT_SYMBOL_GPL(tps65910_set_bits);

int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
{
	return regmap_update_bits(tps65910->regmap, reg, mask, 0);
}
EXPORT_SYMBOL_GPL(tps65910_clear_bits);

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,
	.num_reg_defaults_raw = TPS65910_MAX_REGISTER,
	.cache_type = REGCACHE_RBTREE,
};

static 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_platform_data *init_data;
	int ret = 0;

	pmic_plat_data = dev_get_platdata(&i2c->dev);
	if (!pmic_plat_data)
		return -EINVAL;

	init_data = kzalloc(sizeof(struct tps65910_platform_data), GFP_KERNEL);
	if (init_data == NULL)
		return -ENOMEM;

	tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
	if (tps65910 == NULL) {
		kfree(init_data);
		return -ENOMEM;
	}

	i2c_set_clientdata(i2c, tps65910);
	tps65910->dev = &i2c->dev;
	tps65910->i2c_client = i2c;
	tps65910->id = id->driver_data;
	tps65910->read = tps65910_i2c_read;
	tps65910->write = tps65910_i2c_write;
	mutex_init(&tps65910->io_mutex);

	tps65910->regmap = 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);
		goto regmap_err;
	}

	ret = mfd_add_devices(tps65910->dev, -1,
			      tps65910s, ARRAY_SIZE(tps65910s),
			      NULL, 0);
	if (ret < 0)
		goto err;

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

	tps65910_gpio_init(tps65910, pmic_plat_data->gpio_base);

	tps65910_irq_init(tps65910, init_data->irq, init_data);

	kfree(init_data);
	return ret;

err:
	regmap_exit(tps65910->regmap);
regmap_err:
	kfree(tps65910);
	kfree(init_data);
	return ret;
}

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

	tps65910_irq_exit(tps65910);
	mfd_remove_devices(tps65910->dev);
	regmap_exit(tps65910->regmap);
	kfree(tps65910);

	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,
	},
	.probe = tps65910_i2c_probe,
	.remove = 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 <gg@slimlogic.co.uk>");
MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
MODULE_LICENSE("GPL");