LXR linux/drivers/mfd/arizona-spi.c

   1/*
   2 * arizona-spi.c  --  Arizona SPI bus interface
   3 *
   4 * Copyright 2012 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
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12
  13#include <linux/err.h>
  14#include <linux/module.h>
  15#include <linux/pm_runtime.h>
  16#include <linux/regmap.h>
  17#include <linux/regulator/consumer.h>
  18#include <linux/slab.h>
  19#include <linux/spi/spi.h>
  20#include <linux/of.h>
  21
  22#include <linux/mfd/arizona/core.h>
  23
  24#include "arizona.h"
  25
  26static int arizona_spi_probe(struct spi_device *spi)
  27{
  28        const struct spi_device_id *id = spi_get_device_id(spi);
  29        struct arizona *arizona;
  30        const struct regmap_config *regmap_config = NULL;
  31        unsigned long type;
  32        int ret;
  33
  34        if (spi->dev.of_node)
  35                type = arizona_of_get_type(&spi->dev);
  36        else
  37                type = id->driver_data;
  38
  39        switch (type) {
  40        case WM5102:
  41                if (IS_ENABLED(CONFIG_MFD_WM5102))
  42                        regmap_config = &wm5102_spi_regmap;
  43                break;
  44        case WM5110:
  45        case WM8280:
  46                if (IS_ENABLED(CONFIG_MFD_WM5110))
  47                        regmap_config = &wm5110_spi_regmap;
  48                break;
  49        default:
  50                dev_err(&spi->dev, "Unknown device type %ld\n", type);
  51                return -EINVAL;
  52        }
  53
  54        if (!regmap_config) {
  55                dev_err(&spi->dev,
  56                        "No kernel support for device type %ld\n", type);
  57                return -EINVAL;
  58        }
  59
  60        arizona = devm_kzalloc(&spi->dev, sizeof(*arizona), GFP_KERNEL);
  61        if (arizona == NULL)
  62                return -ENOMEM;
  63
  64        arizona->regmap = devm_regmap_init_spi(spi, regmap_config);
  65        if (IS_ERR(arizona->regmap)) {
  66                ret = PTR_ERR(arizona->regmap);
  67                dev_err(&spi->dev, "Failed to allocate register map: %d\n",
  68                        ret);
  69                return ret;
  70        }
  71
  72        arizona->type = type;
  73        arizona->dev = &spi->dev;
  74        arizona->irq = spi->irq;
  75
  76        return arizona_dev_init(arizona);
  77}
  78
  79static int arizona_spi_remove(struct spi_device *spi)
  80{
  81        struct arizona *arizona = spi_get_drvdata(spi);
  82
  83        arizona_dev_exit(arizona);
  84
  85        return 0;
  86}
  87
  88static const struct spi_device_id arizona_spi_ids[] = {
  89        { "wm5102", WM5102 },
  90        { "wm5110", WM5110 },
  91        { "wm8280", WM8280 },
  92        { },
  93};
  94MODULE_DEVICE_TABLE(spi, arizona_spi_ids);
  95
  96static struct spi_driver arizona_spi_driver = {
  97        .driver = {
  98                .name   = "arizona",
  99                .pm     = &arizona_pm_ops,
 100                .of_match_table = of_match_ptr(arizona_of_match),
 101        },
 102        .probe          = arizona_spi_probe,
 103        .remove         = arizona_spi_remove,
 104        .id_table       = arizona_spi_ids,
 105};
 106
 107module_spi_driver(arizona_spi_driver);
 108
 109MODULE_DESCRIPTION("Arizona SPI bus interface");
 110MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 111MODULE_LICENSE("GPL");
 112