diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-mcp23s08_i2c.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-mcp23s08_i2c.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-mcp23s08_i2c.c b/drivers/pinctrl/pinctrl-mcp23s08_i2c.c new file mode 100644 index 0000000000..3dd1bd8e73 --- /dev/null +++ b/drivers/pinctrl/pinctrl-mcp23s08_i2c.c @@ -0,0 +1,125 @@ +// 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 = i2c_client_get_device_id(client); + 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"); |