1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * ST Microelectronics MFD: stmpe's i2c client specific driver
  4 *
  5 * Copyright (C) ST-Ericsson SA 2010
  6 * Copyright (C) ST Microelectronics SA 2011
  7 *
  8 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
  9 * Author: Viresh Kumar <vireshk@kernel.org> for ST Microelectronics
 10 */
 11
 12#include <linux/i2c.h>
 13#include <linux/interrupt.h>
 14#include <linux/kernel.h>
 15#include <linux/module.h>
 16#include <linux/types.h>
 17#include <linux/of_device.h>
 18#include "stmpe.h"
 19
 20static int i2c_reg_read(struct stmpe *stmpe, u8 reg)
 21{
 22	struct i2c_client *i2c = stmpe->client;
 23
 24	return i2c_smbus_read_byte_data(i2c, reg);
 25}
 26
 27static int i2c_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
 28{
 29	struct i2c_client *i2c = stmpe->client;
 30
 31	return i2c_smbus_write_byte_data(i2c, reg, val);
 32}
 33
 34static int i2c_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
 35{
 36	struct i2c_client *i2c = stmpe->client;
 37
 38	return i2c_smbus_read_i2c_block_data(i2c, reg, length, values);
 39}
 40
 41static int i2c_block_write(struct stmpe *stmpe, u8 reg, u8 length,
 42		const u8 *values)
 43{
 44	struct i2c_client *i2c = stmpe->client;
 45
 46	return i2c_smbus_write_i2c_block_data(i2c, reg, length, values);
 47}
 48
 49static struct stmpe_client_info i2c_ci = {
 50	.read_byte = i2c_reg_read,
 51	.write_byte = i2c_reg_write,
 52	.read_block = i2c_block_read,
 53	.write_block = i2c_block_write,
 54};
 55
 56static const struct of_device_id stmpe_of_match[] = {
 57	{ .compatible = "st,stmpe610", .data = (void *)STMPE610, },
 58	{ .compatible = "st,stmpe801", .data = (void *)STMPE801, },
 59	{ .compatible = "st,stmpe811", .data = (void *)STMPE811, },
 60	{ .compatible = "st,stmpe1600", .data = (void *)STMPE1600, },
 61	{ .compatible = "st,stmpe1601", .data = (void *)STMPE1601, },
 62	{ .compatible = "st,stmpe1801", .data = (void *)STMPE1801, },
 63	{ .compatible = "st,stmpe2401", .data = (void *)STMPE2401, },
 64	{ .compatible = "st,stmpe2403", .data = (void *)STMPE2403, },
 65	{},
 66};
 67MODULE_DEVICE_TABLE(of, stmpe_of_match);
 68
 69static int
 70stmpe_i2c_probe(struct i2c_client *i2c)
 71{
 72	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
 73	enum stmpe_partnum partnum;
 74	const struct of_device_id *of_id;
 75
 76	i2c_ci.data = (void *)id;
 77	i2c_ci.irq = i2c->irq;
 78	i2c_ci.client = i2c;
 79	i2c_ci.dev = &i2c->dev;
 80
 81	of_id = of_match_device(stmpe_of_match, &i2c->dev);
 82	if (!of_id) {
 83		/*
 84		 * This happens when the I2C ID matches the node name
 85		 * but no real compatible string has been given.
 86		 */
 87		dev_info(&i2c->dev, "matching on node name, compatible is preferred\n");
 88		partnum = id->driver_data;
 89	} else
 90		partnum = (uintptr_t)of_id->data;
 91
 92	return stmpe_probe(&i2c_ci, partnum);
 93}
 94
 95static void stmpe_i2c_remove(struct i2c_client *i2c)
 96{
 97	struct stmpe *stmpe = dev_get_drvdata(&i2c->dev);
 98
 99	stmpe_remove(stmpe);
100}
101
102static const struct i2c_device_id stmpe_i2c_id[] = {
103	{ "stmpe610", STMPE610 },
104	{ "stmpe801", STMPE801 },
105	{ "stmpe811", STMPE811 },
106	{ "stmpe1600", STMPE1600 },
107	{ "stmpe1601", STMPE1601 },
108	{ "stmpe1801", STMPE1801 },
109	{ "stmpe2401", STMPE2401 },
110	{ "stmpe2403", STMPE2403 },
111	{ }
112};
113MODULE_DEVICE_TABLE(i2c, stmpe_i2c_id);
114
115static struct i2c_driver stmpe_i2c_driver = {
116	.driver = {
117		.name = "stmpe-i2c",
118		.pm = pm_sleep_ptr(&stmpe_dev_pm_ops),
119		.of_match_table = stmpe_of_match,
120	},
121	.probe		= stmpe_i2c_probe,
122	.remove		= stmpe_i2c_remove,
123	.id_table	= stmpe_i2c_id,
124};
125
126static int __init stmpe_init(void)
127{
128	return i2c_add_driver(&stmpe_i2c_driver);
129}
130subsys_initcall(stmpe_init);
131
132static void __exit stmpe_exit(void)
133{
134	i2c_del_driver(&stmpe_i2c_driver);
135}
136module_exit(stmpe_exit);
137
138MODULE_DESCRIPTION("STMPE MFD I2C Interface Driver");
139MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");