1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
  4 *
  5 * Author: Keerthy <j-keerthy@ti.com>
  6 */
  7
  8#include <linux/gpio/consumer.h>
  9#include <linux/interrupt.h>
 10#include <linux/mfd/core.h>
 11#include <linux/module.h>
 12#include <linux/of_device.h>
 13#include <linux/regmap.h>
 14
 15#include <linux/mfd/lp87565.h>
 16
 17static const struct regmap_config lp87565_regmap_config = {
 18	.reg_bits = 8,
 19	.val_bits = 8,
 20	.max_register = LP87565_REG_MAX,
 21};
 22
 23static const struct mfd_cell lp87565_cells[] = {
 24	{ .name = "lp87565-q1-regulator", },
 25	{ .name = "lp87565-q1-gpio", },
 26};
 27
 28static const struct of_device_id of_lp87565_match_table[] = {
 29	{ .compatible = "ti,lp87565", },
 30	{
 31		.compatible = "ti,lp87524-q1",
 32		.data = (void *)LP87565_DEVICE_TYPE_LP87524_Q1,
 33	},
 34	{
 35		.compatible = "ti,lp87565-q1",
 36		.data = (void *)LP87565_DEVICE_TYPE_LP87565_Q1,
 37	},
 38	{
 39		.compatible = "ti,lp87561-q1",
 40		.data = (void *)LP87565_DEVICE_TYPE_LP87561_Q1,
 41	},
 42	{}
 43};
 44MODULE_DEVICE_TABLE(of, of_lp87565_match_table);
 45
 46static int lp87565_probe(struct i2c_client *client,
 47			 const struct i2c_device_id *ids)
 48{
 49	struct lp87565 *lp87565;
 50	const struct of_device_id *of_id;
 51	int ret;
 52	unsigned int otpid;
 53
 54	lp87565 = devm_kzalloc(&client->dev, sizeof(*lp87565), GFP_KERNEL);
 55	if (!lp87565)
 56		return -ENOMEM;
 57
 58	lp87565->dev = &client->dev;
 59
 60	lp87565->regmap = devm_regmap_init_i2c(client, &lp87565_regmap_config);
 61	if (IS_ERR(lp87565->regmap)) {
 62		ret = PTR_ERR(lp87565->regmap);
 63		dev_err(lp87565->dev,
 64			"Failed to initialize register map: %d\n", ret);
 65		return ret;
 66	}
 67
 68	lp87565->reset_gpio = devm_gpiod_get_optional(lp87565->dev, "reset",
 69						      GPIOD_OUT_LOW);
 70	if (IS_ERR(lp87565->reset_gpio)) {
 71		ret = PTR_ERR(lp87565->reset_gpio);
 72		if (ret == -EPROBE_DEFER)
 73			return ret;
 74	}
 75
 76	if (lp87565->reset_gpio) {
 77		gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
 78		/* The minimum assertion time is undocumented, just guess */
 79		usleep_range(2000, 4000);
 80
 81		gpiod_set_value_cansleep(lp87565->reset_gpio, 0);
 82		/* Min 1.2 ms before first I2C transaction */
 83		usleep_range(1500, 3000);
 84	}
 85
 86	ret = regmap_read(lp87565->regmap, LP87565_REG_OTP_REV, &otpid);
 87	if (ret) {
 88		dev_err(lp87565->dev, "Failed to read OTP ID\n");
 89		return ret;
 90	}
 91
 92	lp87565->rev = otpid & LP87565_OTP_REV_OTP_ID;
 93
 94	of_id = of_match_device(of_lp87565_match_table, &client->dev);
 95	if (of_id)
 96		lp87565->dev_type = (enum lp87565_device_type)of_id->data;
 97
 98	i2c_set_clientdata(client, lp87565);
 99
100	return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO,
101				    lp87565_cells, ARRAY_SIZE(lp87565_cells),
102				    NULL, 0, NULL);
103}
104
105static void lp87565_shutdown(struct i2c_client *client)
106{
107	struct lp87565 *lp87565 = i2c_get_clientdata(client);
108
109	gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
110}
111
112static const struct i2c_device_id lp87565_id_table[] = {
113	{ "lp87565-q1", 0 },
114	{ },
115};
116MODULE_DEVICE_TABLE(i2c, lp87565_id_table);
117
118static struct i2c_driver lp87565_driver = {
119	.driver	= {
120		.name	= "lp87565",
121		.of_match_table = of_lp87565_match_table,
122	},
123	.probe = lp87565_probe,
124	.shutdown = lp87565_shutdown,
125	.id_table = lp87565_id_table,
126};
127module_i2c_driver(lp87565_driver);
128
129MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
130MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver");
131MODULE_LICENSE("GPL v2");