drivers/mfd/arizona-spi.c

   1 /*
   2  * arizona-spi.c  --  Arizona SPI bus interface
   3  *
   4  * Copyright 2012 Wolfson Microelectronics plc
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/module.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/regmap.h>
  17 #include <linux/regulator/consumer.h>
  18 #include <linux/slab.h>
  19 #include <linux/spi/spi.h>
  20 #include <linux/of.h>
  21
  22 #include <linux/mfd/arizona/core.h>
  23
  24 #include "arizona.h"
  25
  26 static int arizona_spi_probe(struct spi_device *spi)
  27 {
  28         const struct spi_device_id *id = spi_get_device_id(spi);
  29         struct arizona *arizona;
  30         const struct regmap_config *regmap_config = NULL;
  31         unsigned long type;
  32         int ret;
  33
  34         if (spi->dev.of_node)
  35                 type = arizona_of_get_type(&spi->dev);
  36         else
  37                 type = id->driver_data;
  38
  39         switch (type) {
  40         case WM5102:
  41                 if (IS_ENABLED(CONFIG_MFD_WM5102))
  42                         regmap_config = &wm5102_spi_regmap;
  43                 break;
  44         case WM5110:
  45         case WM8280:
  46                 if (IS_ENABLED(CONFIG_MFD_WM5110))
  47                         regmap_config = &wm5110_spi_regmap;
  48                 break;
  49         default:
  50                 dev_err(&spi->dev, "Unknown device type %ld\n", type);
  51                 return -EINVAL;
  52         }
  53
  54         if (!regmap_config) {
  55                 dev_err(&spi->dev,
  56                         "No kernel support for device type %ld\n", type);
  57                 return -EINVAL;
  58         }
  59
  60         arizona = devm_kzalloc(&spi->dev, sizeof(*arizona), GFP_KERNEL);
  61         if (arizona == NULL)
  62                 return -ENOMEM;
  63
  64         arizona->regmap = devm_regmap_init_spi(spi, regmap_config);
  65         if (IS_ERR(arizona->regmap)) {
  66                 ret = PTR_ERR(arizona->regmap);
  67                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
  68                         ret);
  69                 return ret;
  70         }
  71
  72         arizona->type = type;
  73         arizona->dev = &spi->dev;
  74         arizona->irq = spi->irq;
  75
  76         return arizona_dev_init(arizona);
  77 }
  78
  79 static int arizona_spi_remove(struct spi_device *spi)
  80 {
  81         struct arizona *arizona = spi_get_drvdata(spi);
  82
  83         arizona_dev_exit(arizona);
  84
  85         return 0;
  86 }
  87
  88 static const struct spi_device_id arizona_spi_ids[] = {
  89         { "wm5102", WM5102 },
  90         { "wm5110", WM5110 },
  91         { "wm8280", WM8280 },
  92         { },
  93 };
  94 MODULE_DEVICE_TABLE(spi, arizona_spi_ids);
  95
  96 static struct spi_driver arizona_spi_driver = {
  97         .driver = {
  98                 .name   = "arizona",
  99                 .pm     = &arizona_pm_ops,
 100                 .of_match_table = of_match_ptr(arizona_of_match),
 101         },
 102         .probe          = arizona_spi_probe,
 103         .remove         = arizona_spi_remove,
 104         .id_table       = arizona_spi_ids,
 105 };
 106
 107 module_spi_driver(arizona_spi_driver);
 108
 109 MODULE_DESCRIPTION("Arizona SPI bus interface");
 110 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 111 MODULE_LICENSE("GPL");