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