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, const struct i2c_device_id *id)
 12{
 13	struct device *dev = &client->dev;
 14	unsigned int type = id->driver_data;
 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	switch (type) {
 23	case MCP_TYPE_008:
 24		mcp->regmap = devm_regmap_init_i2c(client, &mcp23x08_regmap);
 25		mcp->reg_shift = 0;
 26		mcp->chip.ngpio = 8;
 27		mcp->chip.label = "mcp23008";
 28		break;
 29
 30	case MCP_TYPE_017:
 31		mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
 32		mcp->reg_shift = 1;
 33		mcp->chip.ngpio = 16;
 34		mcp->chip.label = "mcp23017";
 35		break;
 36
 37	case MCP_TYPE_018:
 38		mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap);
 39		mcp->reg_shift = 1;
 40		mcp->chip.ngpio = 16;
 41		mcp->chip.label = "mcp23018";
 42		break;
 43
 44	default:
 45		dev_err(dev, "invalid device type (%d)\n", type);
 46		return -EINVAL;
 47	}
 48
 49	if (IS_ERR(mcp->regmap))
 50		return PTR_ERR(mcp->regmap);
 51
 52	mcp->irq = client->irq;
 53	mcp->pinctrl_desc.name = "mcp23xxx-pinctrl";
 54
 55	ret = mcp23s08_probe_one(mcp, dev, client->addr, type, -1);
 56	if (ret)
 57		return ret;
 58
 59	i2c_set_clientdata(client, mcp);
 60
 61	return 0;
 62}
 63
 64static const struct i2c_device_id mcp230xx_id[] = {
 65	{ "mcp23008", MCP_TYPE_008 },
 66	{ "mcp23017", MCP_TYPE_017 },
 67	{ "mcp23018", MCP_TYPE_018 },
 68	{ }
 69};
 70MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
 71
 72static const struct of_device_id mcp23s08_i2c_of_match[] = {
 73	{
 74		.compatible = "microchip,mcp23008",
 75		.data = (void *) MCP_TYPE_008,
 76	},
 77	{
 78		.compatible = "microchip,mcp23017",
 79		.data = (void *) MCP_TYPE_017,
 80	},
 81	{
 82		.compatible = "microchip,mcp23018",
 83		.data = (void *) MCP_TYPE_018,
 84	},
 85/* NOTE: The use of the mcp prefix is deprecated and will be removed. */
 86	{
 87		.compatible = "mcp,mcp23008",
 88		.data = (void *) MCP_TYPE_008,
 89	},
 90	{
 91		.compatible = "mcp,mcp23017",
 92		.data = (void *) MCP_TYPE_017,
 93	},
 94	{ }
 95};
 96MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
 97
 98static struct i2c_driver mcp230xx_driver = {
 99	.driver = {
100		.name	= "mcp230xx",
101		.of_match_table = mcp23s08_i2c_of_match,
102	},
103	.probe		= mcp230xx_probe,
104	.id_table	= mcp230xx_id,
105};
106
107static int __init mcp23s08_i2c_init(void)
108{
109	return i2c_add_driver(&mcp230xx_driver);
110}
111
112/*
113 * Register after I²C postcore initcall and before
114 * subsys initcalls that may rely on these GPIOs.
115 */
116subsys_initcall(mcp23s08_i2c_init);
117
118static void mcp23s08_i2c_exit(void)
119{
120	i2c_del_driver(&mcp230xx_driver);
121}
122module_exit(mcp23s08_i2c_exit);
123
124MODULE_LICENSE("GPL");