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 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->mode = SPI_MODE_0;
  38
  39         spi_set_drvdata(spi, wm831x);
  40         wm831x->dev = &spi->dev;
  41
  42         wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
  43         if (IS_ERR(wm831x->regmap)) {
  44                 ret = PTR_ERR(wm831x->regmap);
  45                 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
  46                         ret);
  47                 return ret;
  48         }
  49
  50         return wm831x_device_init(wm831x, type, spi->irq);
  51 }
  52
  53 static int wm831x_spi_remove(struct spi_device *spi)
  54 {
  55         struct wm831x *wm831x = spi_get_drvdata(spi);
  56
  57         wm831x_device_exit(wm831x);
  58
  59         return 0;
  60 }
  61
  62 static int wm831x_spi_suspend(struct device *dev)
  63 {
  64         struct wm831x *wm831x = dev_get_drvdata(dev);
  65
  66         return wm831x_device_suspend(wm831x);
  67 }
  68
  69 static int wm831x_spi_poweroff(struct device *dev)
  70 {
  71         struct wm831x *wm831x = dev_get_drvdata(dev);
  72
  73         wm831x_device_shutdown(wm831x);
  74
  75         return 0;
  76 }
  77
  78 static const struct dev_pm_ops wm831x_spi_pm = {
  79         .freeze = wm831x_spi_suspend,
  80         .suspend = wm831x_spi_suspend,
  81         .poweroff = wm831x_spi_poweroff,
  82 };
  83
  84 static const struct spi_device_id wm831x_spi_ids[] = {
  85         { "wm8310", WM8310 },
  86         { "wm8311", WM8311 },
  87         { "wm8312", WM8312 },
  88         { "wm8320", WM8320 },
  89         { "wm8321", WM8321 },
  90         { "wm8325", WM8325 },
  91         { "wm8326", WM8326 },
  92         { },
  93 };
  94 MODULE_DEVICE_TABLE(spi, wm831x_spi_ids);
  95
  96 static struct spi_driver wm831x_spi_driver = {
  97         .driver = {
  98                 .name   = "wm831x",
  99                 .pm     = &wm831x_spi_pm,
 100         },
 101         .id_table       = wm831x_spi_ids,
 102         .probe          = wm831x_spi_probe,
 103         .remove         = wm831x_spi_remove,
 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");