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