drivers/pinctrl/pinctrl-mcp23s08_i2c.c

   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
  11 static int mcp230xx_probe(struct i2c_client *client)
  12 {
  13         const struct mcp23s08_info *info;
  14         struct device *dev = &client->dev;
  15         struct mcp23s08 *mcp;
  16         int ret;
  17
  18         mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL);
  19         if (!mcp)
  20                 return -ENOMEM;
  21
  22         info = i2c_get_match_data(client);
  23         if (!info)
  24                 return dev_err_probe(dev, -EINVAL, "invalid device type\n");
  25
  26         mcp->reg_shift = info->reg_shift;
  27         mcp->chip.ngpio = info->ngpio;
  28         mcp->chip.label = info->label;
  29         mcp->regmap = devm_regmap_init_i2c(client, info->regmap);
  30         if (IS_ERR(mcp->regmap))
  31                 return PTR_ERR(mcp->regmap);
  32
  33         mcp->irq = client->irq;
  34         mcp->pinctrl_desc.name = "mcp23xxx-pinctrl";
  35
  36         ret = mcp23s08_probe_one(mcp, dev, client->addr, info->type, -1);
  37         if (ret)
  38                 return ret;
  39
  40         i2c_set_clientdata(client, mcp);
  41
  42         return 0;
  43 }
  44
  45 static const struct mcp23s08_info mcp23008_i2c = {
  46         .regmap = &mcp23x08_regmap,
  47         .label = "mcp23008",
  48         .type = MCP_TYPE_008,
  49         .ngpio = 8,
  50         .reg_shift = 0,
  51 };
  52
  53 static const struct mcp23s08_info mcp23017_i2c = {
  54         .regmap = &mcp23x17_regmap,
  55         .label = "mcp23017",
  56         .type = MCP_TYPE_017,
  57         .ngpio = 16,
  58         .reg_shift = 1,
  59 };
  60
  61 static const struct mcp23s08_info  mcp23018_i2c = {
  62         .regmap = &mcp23x17_regmap,
  63         .label = "mcp23018",
  64         .type = MCP_TYPE_018,
  65         .ngpio = 16,
  66         .reg_shift = 1,
  67 };
  68
  69 static const struct i2c_device_id mcp230xx_id[] = {
  70         { "mcp23008", (kernel_ulong_t)&mcp23008_i2c },
  71         { "mcp23017", (kernel_ulong_t)&mcp23017_i2c },
  72         { "mcp23018", (kernel_ulong_t)&mcp23018_i2c },
  73         { }
  74 };
  75 MODULE_DEVICE_TABLE(i2c, mcp230xx_id);
  76
  77 static const struct of_device_id mcp23s08_i2c_of_match[] = {
  78         { .compatible = "microchip,mcp23008", .data = &mcp23008_i2c },
  79         { .compatible = "microchip,mcp23017", .data = &mcp23017_i2c },
  80         { .compatible = "microchip,mcp23018", .data = &mcp23018_i2c },
  81 /* NOTE: The use of the mcp prefix is deprecated and will be removed. */
  82         { .compatible = "mcp,mcp23008", .data = &mcp23008_i2c },
  83         { .compatible = "mcp,mcp23017", .data = &mcp23017_i2c },
  84         { }
  85 };
  86 MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
  87
  88 static struct i2c_driver mcp230xx_driver = {
  89         .driver = {
  90                 .name   = "mcp230xx",
  91                 .of_match_table = mcp23s08_i2c_of_match,
  92         },
  93         .probe          = mcp230xx_probe,
  94         .id_table       = mcp230xx_id,
  95 };
  96
  97 static int __init mcp23s08_i2c_init(void)
  98 {
  99         return i2c_add_driver(&mcp230xx_driver);
 100 }
 101
 102 /*
 103  * Register after I²C postcore initcall and before
 104  * subsys initcalls that may rely on these GPIOs.
 105  */
 106 subsys_initcall(mcp23s08_i2c_init);
 107
 108 static void mcp23s08_i2c_exit(void)
 109 {
 110         i2c_del_driver(&mcp230xx_driver);
 111 }
 112 module_exit(mcp23s08_i2c_exit);
 113
 114 MODULE_DESCRIPTION("MCP23S08 I2C GPIO driver");
 115 MODULE_LICENSE("GPL");