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/i2c.h>
 10#include <linux/interrupt.h>
 11#include <linux/mfd/core.h>
 12#include <linux/mod_devicetable.h>
 13#include <linux/module.h>
 14#include <linux/regmap.h>
 15
 16#include <linux/mfd/lp87565.h>
 17
 18static const struct regmap_config lp87565_regmap_config = {
 19	.reg_bits = 8,
 20	.val_bits = 8,
 21	.max_register = LP87565_REG_MAX,
 22};
 23
 24static const struct mfd_cell lp87565_cells[] = {
 25	{ .name = "lp87565-q1-regulator", },
 26	{ .name = "lp87565-q1-gpio", },
 27};
 28
 29static const struct of_device_id of_lp87565_match_table[] = {
 30	{ .compatible = "ti,lp87565", },
 31	{
 32		.compatible = "ti,lp87524-q1",
 33		.data = (void *)LP87565_DEVICE_TYPE_LP87524_Q1,
 34	},
 35	{
 36		.compatible = "ti,lp87565-q1",
 37		.data = (void *)LP87565_DEVICE_TYPE_LP87565_Q1,
 38	},
 39	{
 40		.compatible = "ti,lp87561-q1",
 41		.data = (void *)LP87565_DEVICE_TYPE_LP87561_Q1,
 42	},
 43	{}
 44};
 45MODULE_DEVICE_TABLE(of, of_lp87565_match_table);
 46
 47static int lp87565_probe(struct i2c_client *client)
 48{
 49	struct lp87565 *lp87565;
 50	int ret;
 51	unsigned int otpid;
 52
 53	lp87565 = devm_kzalloc(&client->dev, sizeof(*lp87565), GFP_KERNEL);
 54	if (!lp87565)
 55		return -ENOMEM;
 56
 57	lp87565->dev = &client->dev;
 58
 59	lp87565->regmap = devm_regmap_init_i2c(client, &lp87565_regmap_config);
 60	if (IS_ERR(lp87565->regmap)) {
 61		ret = PTR_ERR(lp87565->regmap);
 62		dev_err(lp87565->dev,
 63			"Failed to initialize register map: %d\n", ret);
 64		return ret;
 65	}
 66
 67	lp87565->reset_gpio = devm_gpiod_get_optional(lp87565->dev, "reset",
 68						      GPIOD_OUT_LOW);
 69	if (IS_ERR(lp87565->reset_gpio)) {
 70		ret = PTR_ERR(lp87565->reset_gpio);
 71		if (ret == -EPROBE_DEFER)
 72			return ret;
 73	}
 74
 75	if (lp87565->reset_gpio) {
 76		gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
 77		/* The minimum assertion time is undocumented, just guess */
 78		usleep_range(2000, 4000);
 79
 80		gpiod_set_value_cansleep(lp87565->reset_gpio, 0);
 81		/* Min 1.2 ms before first I2C transaction */
 82		usleep_range(1500, 3000);
 83	}
 84
 85	ret = regmap_read(lp87565->regmap, LP87565_REG_OTP_REV, &otpid);
 86	if (ret) {
 87		dev_err(lp87565->dev, "Failed to read OTP ID\n");
 88		return ret;
 89	}
 90
 91	lp87565->rev = otpid & LP87565_OTP_REV_OTP_ID;
 92	lp87565->dev_type = (uintptr_t)i2c_get_match_data(client);
 93
 94	i2c_set_clientdata(client, lp87565);
 95
 96	return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO,
 97				    lp87565_cells, ARRAY_SIZE(lp87565_cells),
 98				    NULL, 0, NULL);
 99}
100
101static void lp87565_shutdown(struct i2c_client *client)
102{
103	struct lp87565 *lp87565 = i2c_get_clientdata(client);
104
105	gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
106}
107
108static const struct i2c_device_id lp87565_id_table[] = {
109	{ "lp87565-q1", 0 },
110	{ },
111};
112MODULE_DEVICE_TABLE(i2c, lp87565_id_table);
113
114static struct i2c_driver lp87565_driver = {
115	.driver	= {
116		.name	= "lp87565",
117		.of_match_table = of_lp87565_match_table,
118	},
119	.probe = lp87565_probe,
120	.shutdown = lp87565_shutdown,
121	.id_table = lp87565_id_table,
122};
123module_i2c_driver(lp87565_driver);
124
125MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
126MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver");
127MODULE_LICENSE("GPL v2");