[mirror_ubuntu-artful-kernel.git] / drivers / mfd / 88pm80x.c

/*
 * I2C driver for Marvell 88PM80x
 *
 * Copyright (C) 2012 Marvell International Ltd.
 * Haojian Zhuang <haojian.zhuang@marvell.com>
 * Joseph(Yossi) Hanin <yhanin@marvell.com>
 * Qiao Zhou <zhouqiao@marvell.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/mfd/88pm80x.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/err.h>

/* 88pm80x chips have same definition for chip id register. */
#define PM80X_CHIP_ID			(0x00)
#define PM80X_CHIP_ID_NUM(x)		(((x) >> 5) & 0x7)
#define PM80X_CHIP_ID_REVISION(x)	((x) & 0x1F)

struct pm80x_chip_mapping {
	unsigned int	id;
	int		type;
};

static struct pm80x_chip_mapping chip_mapping[] = {
	/* 88PM800 chip id number */
	{0x3,	CHIP_PM800},
	/* 88PM805 chip id number */
	{0x0,	CHIP_PM805},
};

/*
 * workaround: some registers needed by pm805 are defined in pm800, so
 * need to use this global variable to maintain the relation between
 * pm800 and pm805. would remove it after HW chip fixes the issue.
 */
static struct pm80x_chip *g_pm80x_chip;

const struct regmap_config pm80x_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};
EXPORT_SYMBOL_GPL(pm80x_regmap_config);


int pm80x_init(struct i2c_client *client)
{
	struct pm80x_chip *chip;
	struct regmap *map;
	unsigned int val;
	int i, ret = 0;

	chip =
	    devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	map = devm_regmap_init_i2c(client, &pm80x_regmap_config);
	if (IS_ERR(map)) {
		ret = PTR_ERR(map);
		dev_err(&client->dev, "Failed to allocate register map: %d\n",
			ret);
		return ret;
	}

	chip->client = client;
	chip->regmap = map;

	chip->irq = client->irq;

	chip->dev = &client->dev;
	dev_set_drvdata(chip->dev, chip);
	i2c_set_clientdata(chip->client, chip);

	ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val);
	if (ret < 0) {
		dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
		return ret;
	}

	for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) {
		if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) {
			chip->type = chip_mapping[i].type;
			break;
		}
	}

	if (i == ARRAY_SIZE(chip_mapping)) {
		dev_err(chip->dev,
			"Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val);
		return -EINVAL;
	}

	device_init_wakeup(&client->dev, 1);

	/*
	 * workaround: set g_pm80x_chip to the first probed chip. if the
	 * second chip is probed, just point to the companion to each
	 * other so that pm805 can access those specific register. would
	 * remove it after HW chip fixes the issue.
	 */
	if (!g_pm80x_chip)
		g_pm80x_chip = chip;
	else {
		chip->companion = g_pm80x_chip->client;
		g_pm80x_chip->companion = chip->client;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(pm80x_init);

int pm80x_deinit(void)
{
	/*
	 * workaround: clear the dependency between pm800 and pm805.
	 * would remove it after HW chip fixes the issue.
	 */
	if (g_pm80x_chip->companion)
		g_pm80x_chip->companion = NULL;
	else
		g_pm80x_chip = NULL;
	return 0;
}
EXPORT_SYMBOL_GPL(pm80x_deinit);

#ifdef CONFIG_PM_SLEEP
static int pm80x_suspend(struct device *dev)
{
	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
	struct pm80x_chip *chip = i2c_get_clientdata(client);

	if (chip && chip->wu_flag)
		if (device_may_wakeup(chip->dev))
			enable_irq_wake(chip->irq);

	return 0;
}

static int pm80x_resume(struct device *dev)
{
	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
	struct pm80x_chip *chip = i2c_get_clientdata(client);

	if (chip && chip->wu_flag)
		if (device_may_wakeup(chip->dev))
			disable_irq_wake(chip->irq);

	return 0;
}
#endif

SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
EXPORT_SYMBOL_GPL(pm80x_pm_ops);

MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
70c6cce0 QZ	1	/*
	2	* I2C driver for Marvell 88PM80x
	3	*
	4	* Copyright (C) 2012 Marvell International Ltd.
	5	* Haojian Zhuang <haojian.zhuang@marvell.com>
	6	* Joseph(Yossi) Hanin <yhanin@marvell.com>
	7	* Qiao Zhou <zhouqiao@marvell.com>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13	#include <linux/kernel.h>
	14	#include <linux/module.h>
	15	#include <linux/i2c.h>
	16	#include <linux/mfd/88pm80x.h>
	17	#include <linux/slab.h>
	18	#include <linux/uaccess.h>
	19	#include <linux/err.h>
	20
03dcc544 CX	21	/* 88pm80x chips have same definition for chip id register. */
	22	#define PM80X_CHIP_ID (0x00)
	23	#define PM80X_CHIP_ID_NUM(x) (((x) >> 5) & 0x7)
	24	#define PM80X_CHIP_ID_REVISION(x) ((x) & 0x1F)
	25
	26	struct pm80x_chip_mapping {
	27	unsigned int id;
	28	int type;
	29	};
	30
	31	static struct pm80x_chip_mapping chip_mapping[] = {
	32	/* 88PM800 chip id number */
	33	{0x3, CHIP_PM800},
	34	/* 88PM805 chip id number */
	35	{0x0, CHIP_PM805},
	36	};
	37
5500e396 QZ	38	/*
	39	* workaround: some registers needed by pm805 are defined in pm800, so
	40	* need to use this global variable to maintain the relation between
	41	* pm800 and pm805. would remove it after HW chip fixes the issue.
	42	*/
	43	static struct pm80x_chip *g_pm80x_chip;
70c6cce0 QZ	44
	45	const struct regmap_config pm80x_regmap_config = {
	46	.reg_bits = 8,
	47	.val_bits = 8,
	48	};
78a73e59	49	EXPORT_SYMBOL_GPL(pm80x_regmap_config);
70c6cce0	50
03dcc544 CX	51
03dcc544 CX	52	int pm80x_init(struct i2c_client *client)
70c6cce0 QZ	53	{
	54	struct pm80x_chip *chip;
	55	struct regmap *map;
03dcc544 CX	56	unsigned int val;
03dcc544 CX	57	int i, ret = 0;
70c6cce0 QZ	58
	59	chip =
	60	devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL);
	61	if (!chip)
	62	return -ENOMEM;
	63
	64	map = devm_regmap_init_i2c(client, &pm80x_regmap_config);
	65	if (IS_ERR(map)) {
	66	ret = PTR_ERR(map);
	67	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	68	ret);
306df798	69	return ret;
70c6cce0 QZ	70	}
70c6cce0 QZ	71
70c6cce0 QZ	72	chip->client = client;
	73	chip->regmap = map;
	74
	75	chip->irq = client->irq;
	76
	77	chip->dev = &client->dev;
	78	dev_set_drvdata(chip->dev, chip);
	79	i2c_set_clientdata(chip->client, chip);
	80
03dcc544 CX	81	ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val);
	82	if (ret < 0) {
	83	dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
	84	return ret;
	85	}
	86
	87	for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) {
	88	if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) {
	89	chip->type = chip_mapping[i].type;
	90	break;
	91	}
	92	}
	93
	94	if (i == ARRAY_SIZE(chip_mapping)) {
	95	dev_err(chip->dev,
	96	"Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val);
	97	return -EINVAL;
	98	}
	99
70c6cce0 QZ	100	device_init_wakeup(&client->dev, 1);
70c6cce0 QZ	101
5500e396 QZ	102	/*
	103	* workaround: set g_pm80x_chip to the first probed chip. if the
	104	* second chip is probed, just point to the companion to each
	105	* other so that pm805 can access those specific register. would
	106	* remove it after HW chip fixes the issue.
	107	*/
	108	if (!g_pm80x_chip)
	109	g_pm80x_chip = chip;
	110	else {
	111	chip->companion = g_pm80x_chip->client;
	112	g_pm80x_chip->companion = chip->client;
	113	}
	114
70c6cce0	115	return 0;
70c6cce0 QZ	116	}
	117	EXPORT_SYMBOL_GPL(pm80x_init);
	118
306df798	119	int pm80x_deinit(void)
70c6cce0	120	{
5500e396 QZ	121	/*
	122	* workaround: clear the dependency between pm800 and pm805.
	123	* would remove it after HW chip fixes the issue.
	124	*/
	125	if (g_pm80x_chip->companion)
	126	g_pm80x_chip->companion = NULL;
	127	else
	128	g_pm80x_chip = NULL;
70c6cce0 QZ	129	return 0;
	130	}
	131	EXPORT_SYMBOL_GPL(pm80x_deinit);
	132
	133	#ifdef CONFIG_PM_SLEEP
	134	static int pm80x_suspend(struct device *dev)
	135	{
	136	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
	137	struct pm80x_chip *chip = i2c_get_clientdata(client);
	138
	139	if (chip && chip->wu_flag)
	140	if (device_may_wakeup(chip->dev))
	141	enable_irq_wake(chip->irq);
	142
	143	return 0;
	144	}
	145
	146	static int pm80x_resume(struct device *dev)
	147	{
	148	struct i2c_client *client = container_of(dev, struct i2c_client, dev);
	149	struct pm80x_chip *chip = i2c_get_clientdata(client);
	150
	151	if (chip && chip->wu_flag)
	152	if (device_may_wakeup(chip->dev))
	153	disable_irq_wake(chip->irq);
	154
	155	return 0;
	156	}
	157	#endif
	158
	159	SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
	160	EXPORT_SYMBOL_GPL(pm80x_pm_ops);
	161
	162	MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
	163	MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
	164	MODULE_LICENSE("GPL");