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
  21 #include <linux/mfd/arizona/core.h>
  22
  23 #include "arizona.h"
  24
  25 static int arizona_spi_probe(struct spi_device *spi)
  26 {
  27         const struct spi_device_id *id = spi_get_device_id(spi);
  28         struct arizona *arizona;
  29         const struct regmap_config *regmap_config;
  30         int ret, type;
  31
  32         if (spi->dev.of_node)
  33                 type = arizona_of_get_type(&spi->dev);
  34         else
  35                 type = id->driver_data;
  36
  37         switch (type) {
  38 #ifdef CONFIG_MFD_WM5102
  39         case WM5102:
  40                 regmap_config = &wm5102_spi_regmap;
  41                 break;
  42 #endif
  43 #ifdef CONFIG_MFD_WM5110
  44         case WM5110:
  45                 regmap_config = &wm5110_spi_regmap;
  46                 break;
  47 #endif
  48         default:
  49                 dev_err(&spi->dev, "Unknown device type %ld\n",
  50                         id->driver_data);
  51                 return -EINVAL;
  52         }
  53
  54         arizona = devm_kzalloc(&spi->dev, sizeof(*arizona), GFP_KERNEL);
  55         if (arizona == NULL)
  56                 return -ENOMEM;
  57
  58         arizona->regmap = devm_regmap_init_spi(spi, regmap_config);
  59         if (IS_ERR(arizona->regmap)) {
  60                 ret = PTR_ERR(arizona->regmap);
  61                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
  62                         ret);
  63                 return ret;
  64         }
  65
  66         arizona->type = id->driver_data;
  67         arizona->dev = &spi->dev;
  68         arizona->irq = spi->irq;
  69
  70         return arizona_dev_init(arizona);
  71 }
  72
  73 static int arizona_spi_remove(struct spi_device *spi)
  74 {
  75         struct arizona *arizona = spi_get_drvdata(spi);
  76         arizona_dev_exit(arizona);
  77         return 0;
  78 }
  79
  80 static const struct spi_device_id arizona_spi_ids[] = {
  81         { "wm5102", WM5102 },
  82         { "wm5110", WM5110 },
  83         { },
  84 };
  85 MODULE_DEVICE_TABLE(spi, arizona_spi_ids);
  86
  87 static struct spi_driver arizona_spi_driver = {
  88         .driver = {
  89                 .name   = "arizona",
  90                 .owner  = THIS_MODULE,
  91                 .pm     = &arizona_pm_ops,
  92                 .of_match_table = of_match_ptr(arizona_of_match),
  93         },
  94         .probe          = arizona_spi_probe,
  95         .remove         = arizona_spi_remove,
  96         .id_table       = arizona_spi_ids,
  97 };
  98
  99 module_spi_driver(arizona_spi_driver);
 100
 101 MODULE_DESCRIPTION("Arizona SPI bus interface");
 102 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 103 MODULE_LICENSE("GPL");