linux/drivers/mfd/wm831x-spi.c
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   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
  24static 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->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
  54static int 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
  63static 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
  70static 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
  77static const struct dev_pm_ops wm831x_spi_pm = {
  78        .freeze = wm831x_spi_suspend,
  79        .suspend = wm831x_spi_suspend,
  80};
  81
  82static 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};
  92MODULE_DEVICE_TABLE(spi, wm831x_spi_ids);
  93
  94static 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         = wm831x_spi_remove,
 103        .shutdown       = wm831x_spi_shutdown,
 104};
 105
 106static 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}
 116subsys_initcall(wm831x_spi_init);
 117
 118static void __exit wm831x_spi_exit(void)
 119{
 120        spi_unregister_driver(&wm831x_spi_driver);
 121}
 122module_exit(wm831x_spi_exit);
 123
 124MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
 125MODULE_LICENSE("GPL");
 126MODULE_AUTHOR("Mark Brown");
 127
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