drivers/mfd/wm831x-spi.c

   1 /*
   2  * wm831x-spi.c  --  SPI access for Wolfson WM831x PMICs
   3  *
   4  * Copyright 2009,2010 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 it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/pm.h>
  18 #include <linux/spi/spi.h>
  19 #include <linux/regmap.h>
  20 #include <linux/err.h>
  21
  22 #include <linux/mfd/wm831x/core.h>
  23
  24 static int __devinit wm831x_spi_probe(struct spi_device *spi)
  25 {
  26         const struct spi_device_id *id = spi_get_device_id(spi);
  27         struct wm831x *wm831x;
  28         enum wm831x_parent type;
  29         int ret;
  30
  31         type = (enum wm831x_parent)id->driver_data;
  32
  33         wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
  34         if (wm831x == NULL)
  35                 return -ENOMEM;
  36
  37         spi->bits_per_word = 16;
  38         spi->mode = SPI_MODE_0;
  39
  40         dev_set_drvdata(&spi->dev, wm831x);
  41         wm831x->dev = &spi->dev;
  42
  43         wm831x->regmap = regmap_init_spi(spi, &wm831x_regmap_config);
  44         if (IS_ERR(wm831x->regmap)) {
  45                 ret = PTR_ERR(wm831x->regmap);
  46                 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
  47                         ret);
  48                 kfree(wm831x);
  49                 return ret;
  50         }
  51
  52         return wm831x_device_init(wm831x, type, spi->irq);
  53 }
  54
  55 static int __devexit wm831x_spi_remove(struct spi_device *spi)
  56 {
  57         struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
  58
  59         wm831x_device_exit(wm831x);
  60
  61         return 0;
  62 }
  63
  64 static int wm831x_spi_suspend(struct device *dev)
  65 {
  66         struct wm831x *wm831x = dev_get_drvdata(dev);
  67
  68         return wm831x_device_suspend(wm831x);
  69 }
  70
  71 static void wm831x_spi_shutdown(struct spi_device *spi)
  72 {
  73         struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
  74
  75         wm831x_device_shutdown(wm831x);
  76 }
  77
  78 static const struct dev_pm_ops wm831x_spi_pm = {
  79         .freeze = wm831x_spi_suspend,
  80         .suspend = wm831x_spi_suspend,
  81 };
  82
  83 static const struct spi_device_id wm831x_spi_ids[] = {
  84         { "wm8310", WM8310 },
  85         { "wm8311", WM8311 },
  86         { "wm8312", WM8312 },
  87         { "wm8320", WM8320 },
  88         { "wm8321", WM8321 },
  89         { "wm8325", WM8325 },
  90         { "wm8326", WM8326 },
  91         { },
  92 };
  93 MODULE_DEVICE_TABLE(spi, wm831x_spi_id);
  94
  95 static struct spi_driver wm831x_spi_driver = {
  96         .driver = {
  97                 .name   = "wm831x",
  98                 .bus    = &spi_bus_type,
  99                 .owner  = THIS_MODULE,
 100                 .pm     = &wm831x_spi_pm,
 101         },
 102         .id_table       = wm831x_spi_ids,
 103         .probe          = wm831x_spi_probe,
 104         .remove         = __devexit_p(wm831x_spi_remove),
 105         .shutdown       = wm831x_spi_shutdown,
 106 };
 107
 108 static int __init wm831x_spi_init(void)
 109 {
 110         int ret;
 111
 112         ret = spi_register_driver(&wm831x_spi_driver);
 113         if (ret != 0)
 114                 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
 115
 116         return 0;
 117 }
 118 subsys_initcall(wm831x_spi_init);
 119
 120 static void __exit wm831x_spi_exit(void)
 121 {
 122         spi_unregister_driver(&wm831x_spi_driver);
 123 }
 124 module_exit(wm831x_spi_exit);
 125
 126 MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
 127 MODULE_LICENSE("GPL");
 128 MODULE_AUTHOR("Mark Brown");