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// 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_new = 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");
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