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 = devm_kzalloc(&spi->dev, 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 = devm_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                 return ret;
  49         }
  50
  51         return wm831x_device_init(wm831x, type, spi->irq);
  52 }
  53
  54 static int __devexit wm831x_spi_remove(struct spi_device *spi)
  55 {
  56         struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
  57
  58         wm831x_device_exit(wm831x);
  59
  60         return 0;
  61 }
  62
  63 static int wm831x_spi_suspend(struct device *dev)
  64 {
  65         struct wm831x *wm831x = dev_get_drvdata(dev);
  66
  67         return wm831x_device_suspend(wm831x);
  68 }
  69
  70 static void wm831x_spi_shutdown(struct spi_device *spi)
  71 {
  72         struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
  73
  74         wm831x_device_shutdown(wm831x);
  75 }
  76
  77 static const struct dev_pm_ops wm831x_spi_pm = {
  78         .freeze = wm831x_spi_suspend,
  79         .suspend = wm831x_spi_suspend,
  80 };
  81
  82 static const struct spi_device_id wm831x_spi_ids[] = {
  83         { "wm8310", WM8310 },
  84         { "wm8311", WM8311 },
  85         { "wm8312", WM8312 },
  86         { "wm8320", WM8320 },
  87         { "wm8321", WM8321 },
  88         { "wm8325", WM8325 },
  89         { "wm8326", WM8326 },
  90         { },
  91 };
  92 MODULE_DEVICE_TABLE(spi, wm831x_spi_ids);
  93
  94 static struct spi_driver wm831x_spi_driver = {
  95         .driver = {
  96                 .name   = "wm831x",
  97                 .owner  = THIS_MODULE,
  98                 .pm     = &wm831x_spi_pm,
  99         },
 100         .id_table       = wm831x_spi_ids,
 101         .probe          = wm831x_spi_probe,
 102         .remove         = __devexit_p(wm831x_spi_remove),
 103         .shutdown       = wm831x_spi_shutdown,
 104 };
 105
 106 static int __init wm831x_spi_init(void)
 107 {
 108         int ret;
 109
 110         ret = spi_register_driver(&wm831x_spi_driver);
 111         if (ret != 0)
 112                 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
 113
 114         return 0;
 115 }
 116 subsys_initcall(wm831x_spi_init);
 117
 118 static void __exit wm831x_spi_exit(void)
 119 {
 120         spi_unregister_driver(&wm831x_spi_driver);
 121 }
 122 module_exit(wm831x_spi_exit);
 123
 124 MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
 125 MODULE_LICENSE("GPL");
 126 MODULE_AUTHOR("Mark Brown");