[linux-block.git] / drivers / mfd / 88pm80x.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 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>
 */
#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},
	/* 88PM860 chip id number */
	{0x4,	CHIP_PM860},
};

/*
 * 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;
	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);

static int pm80x_suspend(struct device *dev)
{
	struct i2c_client *client = to_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 = to_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;
}

EXPORT_GPL_SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);

MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
70c6cce0 QZ	2	/*
	3	* I2C driver for Marvell 88PM80x
	4	*
	5	* Copyright (C) 2012 Marvell International Ltd.
	6	* Haojian Zhuang <haojian.zhuang@marvell.com>
	7	* Joseph(Yossi) Hanin <yhanin@marvell.com>
	8	* Qiao Zhou <zhouqiao@marvell.com>
70c6cce0 QZ	9	*/
	10	#include <linux/kernel.h>
	11	#include <linux/module.h>
	12	#include <linux/i2c.h>
	13	#include <linux/mfd/88pm80x.h>
	14	#include <linux/slab.h>
	15	#include <linux/uaccess.h>
	16	#include <linux/err.h>
	17
03dcc544 CX	18	/* 88pm80x chips have same definition for chip id register. */
	19	#define PM80X_CHIP_ID (0x00)
	20	#define PM80X_CHIP_ID_NUM(x) (((x) >> 5) & 0x7)
	21	#define PM80X_CHIP_ID_REVISION(x) ((x) & 0x1F)
	22
	23	struct pm80x_chip_mapping {
	24	unsigned int id;
	25	int type;
	26	};
	27
	28	static struct pm80x_chip_mapping chip_mapping[] = {
	29	/* 88PM800 chip id number */
	30	{0x3, CHIP_PM800},
	31	/* 88PM805 chip id number */
	32	{0x0, CHIP_PM805},
62a2e633 VH	33	/* 88PM860 chip id number */
62a2e633 VH	34	{0x4, CHIP_PM860},
03dcc544 CX	35	};
03dcc544 CX	36
5500e396 QZ	37	/*
	38	* workaround: some registers needed by pm805 are defined in pm800, so
	39	* need to use this global variable to maintain the relation between
	40	* pm800 and pm805. would remove it after HW chip fixes the issue.
	41	*/
	42	static struct pm80x_chip *g_pm80x_chip;
70c6cce0 QZ	43
	44	const struct regmap_config pm80x_regmap_config = {
	45	.reg_bits = 8,
	46	.val_bits = 8,
	47	};
78a73e59	48	EXPORT_SYMBOL_GPL(pm80x_regmap_config);
70c6cce0	49
03dcc544 CX	50
03dcc544 CX	51	int pm80x_init(struct i2c_client *client)
70c6cce0 QZ	52	{
	53	struct pm80x_chip *chip;
	54	struct regmap *map;
03dcc544 CX	55	unsigned int val;
03dcc544 CX	56	int i, ret = 0;
70c6cce0 QZ	57
	58	chip =
	59	devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL);
	60	if (!chip)
	61	return -ENOMEM;
	62
	63	map = devm_regmap_init_i2c(client, &pm80x_regmap_config);
	64	if (IS_ERR(map)) {
	65	ret = PTR_ERR(map);
	66	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	67	ret);
306df798	68	return ret;
70c6cce0 QZ	69	}
70c6cce0 QZ	70
70c6cce0 QZ	71	chip->client = client;
	72	chip->regmap = map;
	73
	74	chip->irq = client->irq;
	75
	76	chip->dev = &client->dev;
70c6cce0 QZ	77	i2c_set_clientdata(chip->client, chip);
70c6cce0 QZ	78
03dcc544 CX	79	ret = regmap_read(chip->regmap, PM80X_CHIP_ID, &val);
	80	if (ret < 0) {
	81	dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
	82	return ret;
	83	}
	84
	85	for (i = 0; i < ARRAY_SIZE(chip_mapping); i++) {
	86	if (chip_mapping[i].id == PM80X_CHIP_ID_NUM(val)) {
	87	chip->type = chip_mapping[i].type;
	88	break;
	89	}
	90	}
	91
	92	if (i == ARRAY_SIZE(chip_mapping)) {
	93	dev_err(chip->dev,
	94	"Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val);
	95	return -EINVAL;
	96	}
	97
70c6cce0 QZ	98	device_init_wakeup(&client->dev, 1);
70c6cce0 QZ	99
5500e396 QZ	100	/*
	101	* workaround: set g_pm80x_chip to the first probed chip. if the
	102	* second chip is probed, just point to the companion to each
	103	* other so that pm805 can access those specific register. would
	104	* remove it after HW chip fixes the issue.
	105	*/
	106	if (!g_pm80x_chip)
	107	g_pm80x_chip = chip;
	108	else {
	109	chip->companion = g_pm80x_chip->client;
	110	g_pm80x_chip->companion = chip->client;
	111	}
	112
70c6cce0	113	return 0;
70c6cce0 QZ	114	}
	115	EXPORT_SYMBOL_GPL(pm80x_init);
	116
306df798	117	int pm80x_deinit(void)
70c6cce0	118	{
5500e396 QZ	119	/*
	120	* workaround: clear the dependency between pm800 and pm805.
	121	* would remove it after HW chip fixes the issue.
	122	*/
	123	if (g_pm80x_chip->companion)
	124	g_pm80x_chip->companion = NULL;
	125	else
	126	g_pm80x_chip = NULL;
70c6cce0 QZ	127	return 0;
	128	}
	129	EXPORT_SYMBOL_GPL(pm80x_deinit);
	130
70c6cce0 QZ	131	static int pm80x_suspend(struct device *dev)
70c6cce0 QZ	132	{
1b5420e1	133	struct i2c_client *client = to_i2c_client(dev);
70c6cce0 QZ	134	struct pm80x_chip *chip = i2c_get_clientdata(client);
	135
	136	if (chip && chip->wu_flag)
	137	if (device_may_wakeup(chip->dev))
	138	enable_irq_wake(chip->irq);
	139
	140	return 0;
	141	}
	142
	143	static int pm80x_resume(struct device *dev)
	144	{
1b5420e1	145	struct i2c_client *client = to_i2c_client(dev);
70c6cce0 QZ	146	struct pm80x_chip *chip = i2c_get_clientdata(client);
	147
	148	if (chip && chip->wu_flag)
	149	if (device_may_wakeup(chip->dev))
	150	disable_irq_wake(chip->irq);
	151
	152	return 0;
	153	}
70c6cce0	154
19755a0a	155	EXPORT_GPL_SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
70c6cce0 QZ	156
	157	MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
	158	MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
	159	MODULE_LICENSE("GPL");