| // SPDX-License-Identifier: GPL-2.0-only |
| /* MCP23S08 I2C GPIO driver */ |
| |
| #include <linux/i2c.h> |
| #include <linux/mod_devicetable.h> |
| #include <linux/module.h> |
| #include <linux/regmap.h> |
| |
| #include "pinctrl-mcp23s08.h" |
| |
| static int mcp230xx_probe(struct i2c_client *client, const struct i2c_device_id *id) |
| { |
| struct device *dev = &client->dev; |
| unsigned int type = id->driver_data; |
| struct mcp23s08 *mcp; |
| int ret; |
| |
| mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL); |
| if (!mcp) |
| return -ENOMEM; |
| |
| switch (type) { |
| case MCP_TYPE_008: |
| mcp->regmap = devm_regmap_init_i2c(client, &mcp23x08_regmap); |
| mcp->reg_shift = 0; |
| mcp->chip.ngpio = 8; |
| mcp->chip.label = "mcp23008"; |
| break; |
| |
| case MCP_TYPE_017: |
| mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap); |
| mcp->reg_shift = 1; |
| mcp->chip.ngpio = 16; |
| mcp->chip.label = "mcp23017"; |
| break; |
| |
| case MCP_TYPE_018: |
| mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap); |
| mcp->reg_shift = 1; |
| mcp->chip.ngpio = 16; |
| mcp->chip.label = "mcp23018"; |
| break; |
| |
| default: |
| dev_err(dev, "invalid device type (%d)\n", type); |
| return -EINVAL; |
| } |
| |
| if (IS_ERR(mcp->regmap)) |
| return PTR_ERR(mcp->regmap); |
| |
| mcp->irq = client->irq; |
| mcp->pinctrl_desc.name = "mcp23xxx-pinctrl"; |
| |
| ret = mcp23s08_probe_one(mcp, dev, client->addr, type, -1); |
| if (ret) |
| return ret; |
| |
| i2c_set_clientdata(client, mcp); |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id mcp230xx_id[] = { |
| { "mcp23008", MCP_TYPE_008 }, |
| { "mcp23017", MCP_TYPE_017 }, |
| { "mcp23018", MCP_TYPE_018 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, mcp230xx_id); |
| |
| static const struct of_device_id mcp23s08_i2c_of_match[] = { |
| { |
| .compatible = "microchip,mcp23008", |
| .data = (void *) MCP_TYPE_008, |
| }, |
| { |
| .compatible = "microchip,mcp23017", |
| .data = (void *) MCP_TYPE_017, |
| }, |
| { |
| .compatible = "microchip,mcp23018", |
| .data = (void *) MCP_TYPE_018, |
| }, |
| /* NOTE: The use of the mcp prefix is deprecated and will be removed. */ |
| { |
| .compatible = "mcp,mcp23008", |
| .data = (void *) MCP_TYPE_008, |
| }, |
| { |
| .compatible = "mcp,mcp23017", |
| .data = (void *) MCP_TYPE_017, |
| }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match); |
| |
| static struct i2c_driver mcp230xx_driver = { |
| .driver = { |
| .name = "mcp230xx", |
| .of_match_table = mcp23s08_i2c_of_match, |
| }, |
| .probe = mcp230xx_probe, |
| .id_table = mcp230xx_id, |
| }; |
| |
| static int __init mcp23s08_i2c_init(void) |
| { |
| return i2c_add_driver(&mcp230xx_driver); |
| } |
| |
| /* |
| * Register after I²C postcore initcall and before |
| * subsys initcalls that may rely on these GPIOs. |
| */ |
| subsys_initcall(mcp23s08_i2c_init); |
| |
| static void mcp23s08_i2c_exit(void) |
| { |
| i2c_del_driver(&mcp230xx_driver); |
| } |
| module_exit(mcp23s08_i2c_exit); |
| |
| MODULE_LICENSE("GPL"); |