LXR linux/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/of.h>
  18#include <linux/of_device.h>
  19#include <linux/pm.h>
  20#include <linux/spi/spi.h>
  21#include <linux/regmap.h>
  22#include <linux/err.h>
  23
  24#include <linux/mfd/wm831x/core.h>
  25
  26static int wm831x_spi_probe(struct spi_device *spi)
  27{
  28        struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev);
  29        const struct spi_device_id *id = spi_get_device_id(spi);
  30        const struct of_device_id *of_id;
  31        struct wm831x *wm831x;
  32        enum wm831x_parent type;
  33        int ret;
  34
  35        if (spi->dev.of_node) {
  36                of_id = of_match_device(wm831x_of_match, &spi->dev);
  37                if (!of_id) {
  38                        dev_err(&spi->dev, "Failed to match device\n");
  39                        return -ENODEV;
  40                }
  41                type = (enum wm831x_parent)of_id->data;
  42        } else {
  43                type = (enum wm831x_parent)id->driver_data;
  44        }
  45
  46        wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
  47        if (wm831x == NULL)
  48                return -ENOMEM;
  49
  50        spi->mode = SPI_MODE_0;
  51
  52        spi_set_drvdata(spi, wm831x);
  53        wm831x->dev = &spi->dev;
  54        wm831x->type = type;
  55
  56        wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
  57        if (IS_ERR(wm831x->regmap)) {
  58                ret = PTR_ERR(wm831x->regmap);
  59                dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
  60                        ret);
  61                return ret;
  62        }
  63
  64        if (pdata)
  65                memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
  66
  67        return wm831x_device_init(wm831x, spi->irq);
  68}
  69
  70static int wm831x_spi_remove(struct spi_device *spi)
  71{
  72        struct wm831x *wm831x = spi_get_drvdata(spi);
  73
  74        wm831x_device_exit(wm831x);
  75
  76        return 0;
  77}
  78
  79static int wm831x_spi_suspend(struct device *dev)
  80{
  81        struct wm831x *wm831x = dev_get_drvdata(dev);
  82
  83        return wm831x_device_suspend(wm831x);
  84}
  85
  86static int wm831x_spi_poweroff(struct device *dev)
  87{
  88        struct wm831x *wm831x = dev_get_drvdata(dev);
  89
  90        wm831x_device_shutdown(wm831x);
  91
  92        return 0;
  93}
  94
  95static const struct dev_pm_ops wm831x_spi_pm = {
  96        .freeze = wm831x_spi_suspend,
  97        .suspend = wm831x_spi_suspend,
  98        .poweroff = wm831x_spi_poweroff,
  99};
 100
 101static const struct spi_device_id wm831x_spi_ids[] = {
 102        { "wm8310", WM8310 },
 103        { "wm8311", WM8311 },
 104        { "wm8312", WM8312 },
 105        { "wm8320", WM8320 },
 106        { "wm8321", WM8321 },
 107        { "wm8325", WM8325 },
 108        { "wm8326", WM8326 },
 109        { },
 110};
 111MODULE_DEVICE_TABLE(spi, wm831x_spi_ids);
 112
 113static struct spi_driver wm831x_spi_driver = {
 114        .driver = {
 115                .name   = "wm831x",
 116                .pm     = &wm831x_spi_pm,
 117                .of_match_table = of_match_ptr(wm831x_of_match),
 118        },
 119        .id_table       = wm831x_spi_ids,
 120        .probe          = wm831x_spi_probe,
 121        .remove         = wm831x_spi_remove,
 122};
 123
 124static int __init wm831x_spi_init(void)
 125{
 126        int ret;
 127
 128        ret = spi_register_driver(&wm831x_spi_driver);
 129        if (ret != 0)
 130                pr_err("Failed to register WM831x SPI driver: %d\n", ret);
 131
 132        return 0;
 133}
 134subsys_initcall(wm831x_spi_init);
 135
 136static void __exit wm831x_spi_exit(void)
 137{
 138        spi_unregister_driver(&wm831x_spi_driver);
 139}
 140module_exit(wm831x_spi_exit);
 141
 142MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
 143MODULE_LICENSE("GPL");
 144MODULE_AUTHOR("Mark Brown");
 145