126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
// 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");
|