[mirror_ubuntu-focal-kernel.git] / drivers / mfd / as3711.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * AS3711 PMIC MFC driver
 *
 * Copyright (C) 2012 Renesas Electronics Corporation
 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mfd/as3711.h>
#include <linux/mfd/core.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/slab.h>

enum {
	AS3711_REGULATOR,
	AS3711_BACKLIGHT,
};

/*
 * Ok to have it static: it is only used during probing and multiple I2C devices
 * cannot be probed simultaneously. Just make sure to avoid stale data.
 */
static struct mfd_cell as3711_subdevs[] = {
	[AS3711_REGULATOR] = {.name = "as3711-regulator",},
	[AS3711_BACKLIGHT] = {.name = "as3711-backlight",},
};

static bool as3711_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case AS3711_GPIO_SIGNAL_IN:
	case AS3711_INTERRUPT_STATUS_1:
	case AS3711_INTERRUPT_STATUS_2:
	case AS3711_INTERRUPT_STATUS_3:
	case AS3711_CHARGER_STATUS_1:
	case AS3711_CHARGER_STATUS_2:
	case AS3711_REG_STATUS:
		return true;
	}
	return false;
}

static bool as3711_precious_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case AS3711_INTERRUPT_STATUS_1:
	case AS3711_INTERRUPT_STATUS_2:
	case AS3711_INTERRUPT_STATUS_3:
		return true;
	}
	return false;
}

static bool as3711_readable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case AS3711_SD_1_VOLTAGE:
	case AS3711_SD_2_VOLTAGE:
	case AS3711_SD_3_VOLTAGE:
	case AS3711_SD_4_VOLTAGE:
	case AS3711_LDO_1_VOLTAGE:
	case AS3711_LDO_2_VOLTAGE:
	case AS3711_LDO_3_VOLTAGE:
	case AS3711_LDO_4_VOLTAGE:
	case AS3711_LDO_5_VOLTAGE:
	case AS3711_LDO_6_VOLTAGE:
	case AS3711_LDO_7_VOLTAGE:
	case AS3711_LDO_8_VOLTAGE:
	case AS3711_SD_CONTROL:
	case AS3711_GPIO_SIGNAL_OUT:
	case AS3711_GPIO_SIGNAL_IN:
	case AS3711_SD_CONTROL_1:
	case AS3711_SD_CONTROL_2:
	case AS3711_CURR_CONTROL:
	case AS3711_CURR1_VALUE:
	case AS3711_CURR2_VALUE:
	case AS3711_CURR3_VALUE:
	case AS3711_STEPUP_CONTROL_1:
	case AS3711_STEPUP_CONTROL_2:
	case AS3711_STEPUP_CONTROL_4:
	case AS3711_STEPUP_CONTROL_5:
	case AS3711_REG_STATUS:
	case AS3711_INTERRUPT_STATUS_1:
	case AS3711_INTERRUPT_STATUS_2:
	case AS3711_INTERRUPT_STATUS_3:
	case AS3711_CHARGER_STATUS_1:
	case AS3711_CHARGER_STATUS_2:
	case AS3711_ASIC_ID_1:
	case AS3711_ASIC_ID_2:
		return true;
	}
	return false;
}

static const struct regmap_config as3711_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = as3711_volatile_reg,
	.readable_reg = as3711_readable_reg,
	.precious_reg = as3711_precious_reg,
	.max_register = AS3711_MAX_REG,
	.num_reg_defaults_raw = AS3711_NUM_REGS,
	.cache_type = REGCACHE_RBTREE,
};

#ifdef CONFIG_OF
static const struct of_device_id as3711_of_match[] = {
	{.compatible = "ams,as3711",},
	{}
};
#endif

static int as3711_i2c_probe(struct i2c_client *client,
			    const struct i2c_device_id *id)
{
	struct as3711 *as3711;
	struct as3711_platform_data *pdata;
	unsigned int id1, id2;
	int ret;

	if (!client->dev.of_node) {
		pdata = dev_get_platdata(&client->dev);
		if (!pdata)
			dev_dbg(&client->dev, "Platform data not found\n");
	} else {
		pdata = devm_kzalloc(&client->dev,
				     sizeof(*pdata), GFP_KERNEL);
		if (!pdata)
			return -ENOMEM;
	}

	as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);
	if (!as3711)
		return -ENOMEM;

	as3711->dev = &client->dev;
	i2c_set_clientdata(client, as3711);

	if (client->irq)
		dev_notice(&client->dev, "IRQ not supported yet\n");

	as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config);
	if (IS_ERR(as3711->regmap)) {
		ret = PTR_ERR(as3711->regmap);
		dev_err(&client->dev,
			"regmap initialization failed: %d\n", ret);
		return ret;
	}

	ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1);
	if (!ret)
		ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2);
	if (ret < 0) {
		dev_err(&client->dev, "regmap_read() failed: %d\n", ret);
		return ret;
	}
	if (id1 != 0x8b)
		return -ENODEV;
	dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2);

	/*
	 * We can reuse as3711_subdevs[],
	 * it will be copied in mfd_add_devices()
	 */
	if (pdata) {
		as3711_subdevs[AS3711_REGULATOR].platform_data =
			&pdata->regulator;
		as3711_subdevs[AS3711_REGULATOR].pdata_size =
			sizeof(pdata->regulator);
		as3711_subdevs[AS3711_BACKLIGHT].platform_data =
			&pdata->backlight;
		as3711_subdevs[AS3711_BACKLIGHT].pdata_size =
			sizeof(pdata->backlight);
	} else {
		as3711_subdevs[AS3711_REGULATOR].platform_data = NULL;
		as3711_subdevs[AS3711_REGULATOR].pdata_size = 0;
		as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL;
		as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0;
	}

	ret = devm_mfd_add_devices(as3711->dev, -1, as3711_subdevs,
				   ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL);
	if (ret < 0)
		dev_err(&client->dev, "add mfd devices failed: %d\n", ret);

	return ret;
}

static const struct i2c_device_id as3711_i2c_id[] = {
	{.name = "as3711", .driver_data = 0},
	{}
};

static struct i2c_driver as3711_i2c_driver = {
	.driver = {
		   .name = "as3711",
		   .of_match_table = of_match_ptr(as3711_of_match),
	},
	.probe = as3711_i2c_probe,
	.id_table = as3711_i2c_id,
};

static int __init as3711_i2c_init(void)
{
	return i2c_add_driver(&as3711_i2c_driver);
}
/* Initialise early */
subsys_initcall(as3711_i2c_init);
Commit	Line	Data
aecd8454	1	// SPDX-License-Identifier: GPL-2.0-only
acad189b GL	2	/*
	3	* AS3711 PMIC MFC driver
	4	*
	5	* Copyright (C) 2012 Renesas Electronics Corporation
	6	* Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
acad189b GL	7	*/
	8
	9	#include <linux/device.h>
	10	#include <linux/err.h>
	11	#include <linux/i2c.h>
	12	#include <linux/init.h>
	13	#include <linux/kernel.h>
	14	#include <linux/mfd/as3711.h>
	15	#include <linux/mfd/core.h>
0af6f271	16	#include <linux/of.h>
acad189b GL	17	#include <linux/regmap.h>
	18	#include <linux/slab.h>
	19
	20	enum {
	21	AS3711_REGULATOR,
	22	AS3711_BACKLIGHT,
	23	};
	24
	25	/*
	26	* Ok to have it static: it is only used during probing and multiple I2C devices
	27	* cannot be probed simultaneously. Just make sure to avoid stale data.
	28	*/
	29	static struct mfd_cell as3711_subdevs[] = {
	30	[AS3711_REGULATOR] = {.name = "as3711-regulator",},
	31	[AS3711_BACKLIGHT] = {.name = "as3711-backlight",},
	32	};
	33
	34	static bool as3711_volatile_reg(struct device *dev, unsigned int reg)
	35	{
	36	switch (reg) {
	37	case AS3711_GPIO_SIGNAL_IN:
	38	case AS3711_INTERRUPT_STATUS_1:
	39	case AS3711_INTERRUPT_STATUS_2:
	40	case AS3711_INTERRUPT_STATUS_3:
	41	case AS3711_CHARGER_STATUS_1:
	42	case AS3711_CHARGER_STATUS_2:
	43	case AS3711_REG_STATUS:
	44	return true;
	45	}
	46	return false;
	47	}
	48
	49	static bool as3711_precious_reg(struct device *dev, unsigned int reg)
	50	{
	51	switch (reg) {
	52	case AS3711_INTERRUPT_STATUS_1:
	53	case AS3711_INTERRUPT_STATUS_2:
	54	case AS3711_INTERRUPT_STATUS_3:
	55	return true;
	56	}
	57	return false;
	58	}
	59
	60	static bool as3711_readable_reg(struct device *dev, unsigned int reg)
	61	{
	62	switch (reg) {
	63	case AS3711_SD_1_VOLTAGE:
	64	case AS3711_SD_2_VOLTAGE:
	65	case AS3711_SD_3_VOLTAGE:
	66	case AS3711_SD_4_VOLTAGE:
	67	case AS3711_LDO_1_VOLTAGE:
	68	case AS3711_LDO_2_VOLTAGE:
	69	case AS3711_LDO_3_VOLTAGE:
	70	case AS3711_LDO_4_VOLTAGE:
	71	case AS3711_LDO_5_VOLTAGE:
	72	case AS3711_LDO_6_VOLTAGE:
	73	case AS3711_LDO_7_VOLTAGE:
	74	case AS3711_LDO_8_VOLTAGE:
	75	case AS3711_SD_CONTROL:
	76	case AS3711_GPIO_SIGNAL_OUT:
	77	case AS3711_GPIO_SIGNAL_IN:
	78	case AS3711_SD_CONTROL_1:
	79	case AS3711_SD_CONTROL_2:
	80	case AS3711_CURR_CONTROL:
81	case AS3711_CURR1_VALUE:
82	case AS3711_CURR2_VALUE:
83	case AS3711_CURR3_VALUE:
84	case AS3711_STEPUP_CONTROL_1:
85	case AS3711_STEPUP_CONTROL_2:
86	case AS3711_STEPUP_CONTROL_4:
87	case AS3711_STEPUP_CONTROL_5:
88	case AS3711_REG_STATUS:
89	case AS3711_INTERRUPT_STATUS_1:
90	case AS3711_INTERRUPT_STATUS_2:
91	case AS3711_INTERRUPT_STATUS_3:
92	case AS3711_CHARGER_STATUS_1:
93	case AS3711_CHARGER_STATUS_2:
94	case AS3711_ASIC_ID_1:
95	case AS3711_ASIC_ID_2:
96	return true;
97	}
98	return false;
99	}
100
101	static const struct regmap_config as3711_regmap_config = {
102	.reg_bits = 8,
103	.val_bits = 8,
104	.volatile_reg = as3711_volatile_reg,
105	.readable_reg = as3711_readable_reg,
106	.precious_reg = as3711_precious_reg,
e9b7ba79 MS	107	.max_register = AS3711_MAX_REG,
e9b7ba79 MS	108	.num_reg_defaults_raw = AS3711_NUM_REGS,
acad189b GL	109	.cache_type = REGCACHE_RBTREE,
	110	};
	111
64710af3	112	#ifdef CONFIG_OF
44560303	113	static const struct of_device_id as3711_of_match[] = {
64710af3 GL	114	{.compatible = "ams,as3711",},
	115	{}
	116	};
64710af3 GL	117	#endif
64710af3 GL	118
acad189b GL	119	static int as3711_i2c_probe(struct i2c_client *client,
	120	const struct i2c_device_id *id)
	121	{
	122	struct as3711 *as3711;
64710af3	123	struct as3711_platform_data *pdata;
acad189b GL	124	unsigned int id1, id2;
	125	int ret;
	126
64710af3	127	if (!client->dev.of_node) {
334a41ce	128	pdata = dev_get_platdata(&client->dev);
64710af3 GL	129	if (!pdata)
	130	dev_dbg(&client->dev, "Platform data not found\n");
	131	} else {
	132	pdata = devm_kzalloc(&client->dev,
	133	sizeof(*pdata), GFP_KERNEL);
ae487ae2	134	if (!pdata)
64710af3	135	return -ENOMEM;
64710af3	136	}
acad189b GL	137
acad189b GL	138	as3711 = devm_kzalloc(&client->dev, sizeof(struct as3711), GFP_KERNEL);
ae487ae2	139	if (!as3711)
acad189b	140	return -ENOMEM;
acad189b GL	141
	142	as3711->dev = &client->dev;
	143	i2c_set_clientdata(client, as3711);
	144
	145	if (client->irq)
	146	dev_notice(&client->dev, "IRQ not supported yet\n");
	147
	148	as3711->regmap = devm_regmap_init_i2c(client, &as3711_regmap_config);
	149	if (IS_ERR(as3711->regmap)) {
	150	ret = PTR_ERR(as3711->regmap);
ae487ae2 LJ	151	dev_err(&client->dev,
ae487ae2 LJ	152	"regmap initialization failed: %d\n", ret);
acad189b GL	153	return ret;
	154	}
	155
	156	ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_1, &id1);
	157	if (!ret)
	158	ret = regmap_read(as3711->regmap, AS3711_ASIC_ID_2, &id2);
	159	if (ret < 0) {
	160	dev_err(&client->dev, "regmap_read() failed: %d\n", ret);
	161	return ret;
	162	}
	163	if (id1 != 0x8b)
	164	return -ENODEV;
	165	dev_info(as3711->dev, "AS3711 detected: %x:%x\n", id1, id2);
	166
ae487ae2 LJ	167	/*
	168	* We can reuse as3711_subdevs[],
	169	* it will be copied in mfd_add_devices()
	170	*/
acad189b	171	if (pdata) {
ae487ae2 LJ	172	as3711_subdevs[AS3711_REGULATOR].platform_data =
	173	&pdata->regulator;
	174	as3711_subdevs[AS3711_REGULATOR].pdata_size =
	175	sizeof(pdata->regulator);
	176	as3711_subdevs[AS3711_BACKLIGHT].platform_data =
	177	&pdata->backlight;
	178	as3711_subdevs[AS3711_BACKLIGHT].pdata_size =
	179	sizeof(pdata->backlight);
acad189b GL	180	} else {
	181	as3711_subdevs[AS3711_REGULATOR].platform_data = NULL;
	182	as3711_subdevs[AS3711_REGULATOR].pdata_size = 0;
	183	as3711_subdevs[AS3711_BACKLIGHT].platform_data = NULL;
	184	as3711_subdevs[AS3711_BACKLIGHT].pdata_size = 0;
	185	}
	186
9c998326 LD	187	ret = devm_mfd_add_devices(as3711->dev, -1, as3711_subdevs,
9c998326 LD	188	ARRAY_SIZE(as3711_subdevs), NULL, 0, NULL);
acad189b GL	189	if (ret < 0)
	190	dev_err(&client->dev, "add mfd devices failed: %d\n", ret);
	191
	192	return ret;
	193	}
	194
acad189b GL	195	static const struct i2c_device_id as3711_i2c_id[] = {
	196	{.name = "as3711", .driver_data = 0},
	197	{}
	198	};
	199
acad189b GL	200	static struct i2c_driver as3711_i2c_driver = {
	201	.driver = {
	202	.name = "as3711",
64710af3 GL	203	.of_match_table = of_match_ptr(as3711_of_match),
64710af3 GL	204	},
acad189b	205	.probe = as3711_i2c_probe,
acad189b GL	206	.id_table = as3711_i2c_id,
	207	};
	208
	209	static int __init as3711_i2c_init(void)
	210	{
	211	return i2c_add_driver(&as3711_i2c_driver);
	212	}
	213	/* Initialise early */
	214	subsys_initcall(as3711_i2c_init);