[mirror_ubuntu-bionic-kernel.git] / drivers / mfd / max77686.c

/*
 * max77686.c - mfd core driver for the Maxim 77686
 *
 * Copyright (C) 2012 Samsung Electronics
 * Chiwoong Byun <woong.byun@smasung.com>
 * Jonghwa Lee <jonghwa3.lee@samsung.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * This driver is based on max8997.c
 */

#include <linux/export.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/pm_runtime.h>
#include <linux/module.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max77686.h>
#include <linux/mfd/max77686-private.h>
#include <linux/err.h>

#define I2C_ADDR_RTC	(0x0C >> 1)

static struct mfd_cell max77686_devs[] = {
	{ .name = "max77686-pmic", },
	{ .name = "max77686-rtc", },
};

static struct regmap_config max77686_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

#ifdef CONFIG_OF
static struct of_device_id max77686_pmic_dt_match[] = {
	{.compatible = "maxim,max77686", .data = NULL},
	{},
};

static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
								  *dev)
{
	struct max77686_platform_data *pd;

	pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
	if (!pd) {
		dev_err(dev, "could not allocate memory for pdata\n");
		return NULL;
	}

	dev->platform_data = pd;
	return pd;
}
#else
static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
								  *dev)
{
	return 0;
}
#endif

static int max77686_i2c_probe(struct i2c_client *i2c,
			      const struct i2c_device_id *id)
{
	struct max77686_dev *max77686 = NULL;
	struct max77686_platform_data *pdata = i2c->dev.platform_data;
	unsigned int data;
	int ret = 0;

	if (i2c->dev.of_node)
		pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);

	if (!pdata) {
		ret = -EIO;
		dev_err(&i2c->dev, "No platform data found.\n");
		goto err;
	}

	max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL);
	if (max77686 == NULL)
		return -ENOMEM;

	i2c_set_clientdata(i2c, max77686);
	max77686->dev = &i2c->dev;
	max77686->i2c = i2c;
	max77686->type = id->driver_data;

	max77686->wakeup = pdata->wakeup;
	max77686->irq_gpio = pdata->irq_gpio;
	max77686->irq = i2c->irq;

	max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config);
	if (IS_ERR(max77686->regmap)) {
		ret = PTR_ERR(max77686->regmap);
		dev_err(max77686->dev, "Failed to allocate register map: %d\n",
				ret);
		kfree(max77686);
		return ret;
	}

	if (regmap_read(max77686->regmap,
			 MAX77686_REG_DEVICE_ID, &data) < 0) {
		dev_err(max77686->dev,
			"device not found on this channel (this is not an error)\n");
		ret = -ENODEV;
		goto err;
	} else
		dev_info(max77686->dev, "device found\n");

	max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
	i2c_set_clientdata(max77686->rtc, max77686);

	max77686_irq_init(max77686);

	ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
			      ARRAY_SIZE(max77686_devs), NULL, 0, NULL);

	if (ret < 0)
		goto err_mfd;

	return ret;

err_mfd:
	mfd_remove_devices(max77686->dev);
	i2c_unregister_device(max77686->rtc);
err:
	kfree(max77686);
	return ret;
}

static int max77686_i2c_remove(struct i2c_client *i2c)
{
	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);

	mfd_remove_devices(max77686->dev);
	i2c_unregister_device(max77686->rtc);
	kfree(max77686);

	return 0;
}

static const struct i2c_device_id max77686_i2c_id[] = {
	{ "max77686", TYPE_MAX77686 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);

static struct i2c_driver max77686_i2c_driver = {
	.driver = {
		   .name = "max77686",
		   .owner = THIS_MODULE,
		   .of_match_table = of_match_ptr(max77686_pmic_dt_match),
	},
	.probe = max77686_i2c_probe,
	.remove = max77686_i2c_remove,
	.id_table = max77686_i2c_id,
};

static int __init max77686_i2c_init(void)
{
	return i2c_add_driver(&max77686_i2c_driver);
}
/* init early so consumer devices can complete system boot */
subsys_initcall(max77686_i2c_init);

static void __exit max77686_i2c_exit(void)
{
	i2c_del_driver(&max77686_i2c_driver);
}
module_exit(max77686_i2c_exit);

MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
dae8a969 JL	1	/*
	2	* max77686.c - mfd core driver for the Maxim 77686
	3	*
	4	* Copyright (C) 2012 Samsung Electronics
	5	* Chiwoong Byun <woong.byun@smasung.com>
	6	* Jonghwa Lee <jonghwa3.lee@samsung.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*
	22	* This driver is based on max8997.c
	23	*/
	24
	25	#include <linux/export.h>
	26	#include <linux/slab.h>
	27	#include <linux/i2c.h>
	28	#include <linux/pm_runtime.h>
	29	#include <linux/module.h>
dae8a969 JL	30	#include <linux/mfd/core.h>
	31	#include <linux/mfd/max77686.h>
	32	#include <linux/mfd/max77686-private.h>
	33	#include <linux/err.h>
	34
	35	#define I2C_ADDR_RTC (0x0C >> 1)
	36
	37	static struct mfd_cell max77686_devs[] = {
	38	{ .name = "max77686-pmic", },
	39	{ .name = "max77686-rtc", },
	40	};
	41
	42	static struct regmap_config max77686_regmap_config = {
	43	.reg_bits = 8,
	44	.val_bits = 8,
	45	};
	46
c1516f84	47	#ifdef CONFIG_OF
a9e9ce4c	48	static struct of_device_id max77686_pmic_dt_match[] = {
d1ac2c09	49	{.compatible = "maxim,max77686", .data = NULL},
2984fc00 AL	50	{},
	51	};
	52
c1516f84 YSB	53	static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
	54	*dev)
	55	{
	56	struct max77686_platform_data *pd;
	57
	58	pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
	59	if (!pd) {
	60	dev_err(dev, "could not allocate memory for pdata\n");
	61	return NULL;
	62	}
	63
	64	dev->platform_data = pd;
	65	return pd;
	66	}
	67	#else
	68	static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
	69	*dev)
	70	{
	71	return 0;
	72	}
	73	#endif
	74
dae8a969 JL	75	static int max77686_i2c_probe(struct i2c_client *i2c,
	76	const struct i2c_device_id *id)
	77	{
c1516f84	78	struct max77686_dev *max77686 = NULL;
dae8a969 JL	79	struct max77686_platform_data *pdata = i2c->dev.platform_data;
	80	unsigned int data;
	81	int ret = 0;
	82
c1516f84 YSB	83	if (i2c->dev.of_node)
	84	pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
	85
	86	if (!pdata) {
	87	ret = -EIO;
	88	dev_err(&i2c->dev, "No platform data found.\n");
	89	goto err;
	90	}
	91
dae8a969 JL	92	max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL);
	93	if (max77686 == NULL)
	94	return -ENOMEM;
	95
dae8a969 JL	96	i2c_set_clientdata(i2c, max77686);
	97	max77686->dev = &i2c->dev;
	98	max77686->i2c = i2c;
	99	max77686->type = id->driver_data;
	100
dae8a969 JL	101	max77686->wakeup = pdata->wakeup;
dae8a969 JL	102	max77686->irq_gpio = pdata->irq_gpio;
2b40459b	103	max77686->irq = i2c->irq;
dae8a969	104
136d982e AL	105	max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config);
	106	if (IS_ERR(max77686->regmap)) {
	107	ret = PTR_ERR(max77686->regmap);
	108	dev_err(max77686->dev, "Failed to allocate register map: %d\n",
	109	ret);
	110	kfree(max77686);
	111	return ret;
	112	}
	113
dae8a969 JL	114	if (regmap_read(max77686->regmap,
	115	MAX77686_REG_DEVICE_ID, &data) < 0) {
	116	dev_err(max77686->dev,
	117	"device not found on this channel (this is not an error)\n");
	118	ret = -ENODEV;
	119	goto err;
	120	} else
	121	dev_info(max77686->dev, "device found\n");
	122
	123	max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
	124	i2c_set_clientdata(max77686->rtc, max77686);
	125
	126	max77686_irq_init(max77686);
	127
	128	ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
0848c94f	129	ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
dae8a969 JL	130
	131	if (ret < 0)
	132	goto err_mfd;
	133
	134	return ret;
	135
	136	err_mfd:
	137	mfd_remove_devices(max77686->dev);
	138	i2c_unregister_device(max77686->rtc);
	139	err:
	140	kfree(max77686);
	141	return ret;
	142	}
	143
	144	static int max77686_i2c_remove(struct i2c_client *i2c)
	145	{
	146	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
	147
	148	mfd_remove_devices(max77686->dev);
	149	i2c_unregister_device(max77686->rtc);
	150	kfree(max77686);
	151
	152	return 0;
	153	}
	154
	155	static const struct i2c_device_id max77686_i2c_id[] = {
	156	{ "max77686", TYPE_MAX77686 },
	157	{ }
	158	};
	159	MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
	160
	161	static struct i2c_driver max77686_i2c_driver = {
	162	.driver = {
	163	.name = "max77686",
	164	.owner = THIS_MODULE,
c1516f84	165	.of_match_table = of_match_ptr(max77686_pmic_dt_match),
dae8a969 JL	166	},
	167	.probe = max77686_i2c_probe,
	168	.remove = max77686_i2c_remove,
	169	.id_table = max77686_i2c_id,
	170	};
	171
	172	static int __init max77686_i2c_init(void)
	173	{
	174	return i2c_add_driver(&max77686_i2c_driver);
	175	}
	176	/* init early so consumer devices can complete system boot */
	177	subsys_initcall(max77686_i2c_init);
	178
	179	static void __exit max77686_i2c_exit(void)
	180	{
	181	i2c_del_driver(&max77686_i2c_driver);
	182	}
	183	module_exit(max77686_i2c_exit);
	184
	185	MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
	186	MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
	187	MODULE_LICENSE("GPL");