pinctrl-mcp23s08_i2c.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/* MCP23S08 I2C GPIO driver */
  3
  4#include <linux/i2c.h>
  5#include <linux/mod_devicetable.h>
  6#include <linux/module.h>
  7#include <linux/regmap.h>
  8
  9#include "pinctrl-mcp23s08.h"
 10
 11static int mcp230xx_probe(struct i2c_client *client)
 12{
 13	const struct mcp23s08_info *info;
 14	struct device *dev = &client->dev;
 15	struct mcp23s08 *mcp;
 16	int ret;
 17
 18	mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);
 19	if (!mcp)
 20		return -ENOMEM;
 21
 22	info = i2c_get_match_data(client);
 23	if (!info)
 24		return dev_err_probe(dev, -EINVAL, "invalid device type\n");
 25
 26	mcp->reg_shift = info->reg_shift;
 27	mcp->chip.ngpio = info->ngpio;
 28	mcp->chip.label = info->label;
 29	mcp->regmap = devm_regmap_init_i2c(client, info->regmap);
 30	if (IS_ERR(mcp->regmap))
 31		return PTR_ERR(mcp->regmap);
 32
 33	mcp->irq = client->irq;
 34	mcp->pinctrl_desc.name = "mcp23xxx-pinctrl";
 35
 36	ret = mcp23s08_probe_one(mcp, dev, client->addr, info->type, -1);
 37	if (ret)
 38		return ret;
 39
 40	i2c_set_clientdata(client, mcp);
 41
 42	return 0;
 43}
 44
 45static const struct mcp23s08_info mcp23008_i2c = {
 46	.regmap = &mcp23x08_regmap,
 47	.label = "mcp23008",
 48	.type = MCP_TYPE_008,
 49	.ngpio = 8,
 50	.reg_shift = 0,
 51};
 52
 53static const struct mcp23s08_info mcp23017_i2c = {
 54	.regmap = &mcp23x17_regmap,
 55	.label = "mcp23017",
 56	.type = MCP_TYPE_017,
 57	.ngpio = 16,
 58	.reg_shift = 1,
 59};
 60
 61static const struct mcp23s08_info  mcp23018_i2c = {
 62	.regmap = &mcp23x17_regmap,
 63	.label = "mcp23018",
 64	.type = MCP_TYPE_018,
 65	.ngpio = 16,
 66	.reg_shift = 1,
 67};
 68
 69static const struct i2c_device_id mcp230xx_id[] = {
 70	{ "mcp23008", (kernel_ulong_t)&mcp23008_i2c },
 71	{ "mcp23017", (kernel_ulong_t)&mcp23017_i2c },
 72	{ "mcp23018", (kernel_ulong_t)&mcp23018_i2c },
 73	{ }
 74};
 75MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
 76
 77static const struct of_device_id mcp23s08_i2c_of_match[] = {
 78	{ .compatible = "microchip,mcp23008", .data = &mcp23008_i2c },
 79	{ .compatible = "microchip,mcp23017", .data = &mcp23017_i2c },
 80	{ .compatible = "microchip,mcp23018", .data = &mcp23018_i2c },
 81/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
 82	{ .compatible = "mcp,mcp23008", .data = &mcp23008_i2c },
 83	{ .compatible = "mcp,mcp23017", .data = &mcp23017_i2c },
 84	{ }
 85};
 86MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
 87
 88static struct i2c_driver mcp230xx_driver = {
 89	.driver = {
 90		.name	= "mcp230xx",
 91		.of_match_table = mcp23s08_i2c_of_match,
 92	},
 93	.probe		= mcp230xx_probe,
 94	.id_table	= mcp230xx_id,
 95};
 96
 97static int __init mcp23s08_i2c_init(void)
 98{
 99	return i2c_add_driver(&mcp230xx_driver);
100}
101
102/*
103 * Register after I²C postcore initcall and before
104 * subsys initcalls that may rely on these GPIOs.
105 */
106subsys_initcall(mcp23s08_i2c_init);
107
108static void mcp23s08_i2c_exit(void)
109{
110	i2c_del_driver(&mcp230xx_driver);
111}
112module_exit(mcp23s08_i2c_exit);
113
114MODULE_DESCRIPTION("MCP23S08 I2C GPIO driver");
115MODULE_LICENSE("GPL");