projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 0f04a817 AS |
1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* MCP23S08 I2C GPIO driver */ | |
| 3 | ||
| 4 | #include <linux/i2c.h> | |
| 5 | #include <linux/mod_devicetable.h> | |
| 6 | #include <linux/module.h> | |
| 7 | #include <linux/regmap.h> | |
| 8 | ||
| 9 | #include "pinctrl-mcp23s08.h" | |
| 10 | ||
| 8bb58111 | 11 | static int mcp230xx_probe(struct i2c_client *client) |
| 0f04a817 | 12 | { |
| 8bb58111 | 13 | const struct i2c_device_id *id = i2c_client_get_device_id(client); |
| 0f04a817 AS |
14 | struct device *dev = &client->dev; |
| 15 | unsigned int type = id->driver_data; | |
| 16 | struct mcp23s08 *mcp; | |
| 17 | int ret; | |
| 18 | ||
| 19 | mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL); | |
| 20 | if (!mcp) | |
| 21 | return -ENOMEM; | |
| 22 | ||
| 23 | switch (type) { | |
| 24 | case MCP_TYPE_008: | |
| 25 | mcp->regmap = devm_regmap_init_i2c(client, &mcp23x08_regmap); | |
| 26 | mcp->reg_shift = 0; | |
| 27 | mcp->chip.ngpio = 8; | |
| 28 | mcp->chip.label = "mcp23008"; | |
| 29 | break; | |
| 30 | ||
| 31 | case MCP_TYPE_017: | |
| 32 | mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap); | |
| 33 | mcp->reg_shift = 1; | |
| 34 | mcp->chip.ngpio = 16; | |
| 35 | mcp->chip.label = "mcp23017"; | |
| 36 | break; | |
| 37 | ||
| 38 | case MCP_TYPE_018: | |
| 39 | mcp->regmap = devm_regmap_init_i2c(client, &mcp23x17_regmap); | |
| 40 | mcp->reg_shift = 1; | |
| 41 | mcp->chip.ngpio = 16; | |
| 42 | mcp->chip.label = "mcp23018"; | |
| 43 | break; | |
| 44 | ||
| 45 | default: | |
| 46 | dev_err(dev, "invalid device type (%d)\n", type); | |
| 47 | return -EINVAL; | |
| 48 | } | |
| 49 | ||
| 50 | if (IS_ERR(mcp->regmap)) | |
| 51 | return PTR_ERR(mcp->regmap); | |
| 52 | ||
| 53 | mcp->irq = client->irq; | |
| 54 | mcp->pinctrl_desc.name = "mcp23xxx-pinctrl"; | |
| 55 | ||
| 56 | ret = mcp23s08_probe_one(mcp, dev, client->addr, type, -1); | |
| 57 | if (ret) | |
| 58 | return ret; | |
| 59 | ||
| 60 | i2c_set_clientdata(client, mcp); | |
| 61 | ||
| 62 | return 0; | |
| 63 | } | |
| 64 | ||
| 65 | static const struct i2c_device_id mcp230xx_id[] = { | |
| 66 | { "mcp23008", MCP_TYPE_008 }, | |
| 67 | { "mcp23017", MCP_TYPE_017 }, | |
| 68 | { "mcp23018", MCP_TYPE_018 }, | |
| 69 | { } | |
| 70 | }; | |
| 71 | MODULE_DEVICE_TABLE(i2c, mcp230xx_id); | |
| 72 | ||
| 73 | static const struct of_device_id mcp23s08_i2c_of_match[] = { | |
| 74 | { | |
| 75 | .compatible = "microchip,mcp23008", | |
| 76 | .data = (void *) MCP_TYPE_008, | |
| 77 | }, | |
| 78 | { | |
| 79 | .compatible = "microchip,mcp23017", | |
| 80 | .data = (void *) MCP_TYPE_017, | |
| 81 | }, | |
| 82 | { | |
| 83 | .compatible = "microchip,mcp23018", | |
| 84 | .data = (void *) MCP_TYPE_018, | |
| 85 | }, | |
| 86 | /* NOTE: The use of the mcp prefix is deprecated and will be removed. */ | |
| 87 | { | |
| 88 | .compatible = "mcp,mcp23008", | |
| 89 | .data = (void *) MCP_TYPE_008, | |
| 90 | }, | |
| 91 | { | |
| 92 | .compatible = "mcp,mcp23017", | |
| 93 | .data = (void *) MCP_TYPE_017, | |
| 94 | }, | |
| 95 | { } | |
| 96 | }; | |
| 97 | MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match); | |
| 98 | ||
| 99 | static struct i2c_driver mcp230xx_driver = { | |
| 100 | .driver = { | |
| 101 | .name = "mcp230xx", | |
| 102 | .of_match_table = mcp23s08_i2c_of_match, | |
| 103 | }, | |
| 8bb58111 | 104 | .probe_new = mcp230xx_probe, |
| 0f04a817 AS |
105 | .id_table = mcp230xx_id, |
| 106 | }; | |
| 107 | ||
| 108 | static int __init mcp23s08_i2c_init(void) | |
| 109 | { | |
| 110 | return i2c_add_driver(&mcp230xx_driver); | |
| 111 | } | |
| 112 | ||
| 113 | /* | |
| 114 | * Register after I²C postcore initcall and before | |
| 115 | * subsys initcalls that may rely on these GPIOs. | |
| 116 | */ | |
| 117 | subsys_initcall(mcp23s08_i2c_init); | |
| 118 | ||
| 119 | static void mcp23s08_i2c_exit(void) | |
| 120 | { | |
| 121 | i2c_del_driver(&mcp230xx_driver); | |
| 122 | } | |
| 123 | module_exit(mcp23s08_i2c_exit); | |
| 124 | ||
| 125 | MODULE_LICENSE("GPL"); |