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1// SPDX-License-Identifier: GPL-2.0-only2/* 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 before104 * 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");116