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