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124 lines
2.6 KiB
124 lines
2.6 KiB
// 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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