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