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/init.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
  26 static 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
  70 static int wm831x_spi_suspend(struct device *dev)
  71 {
  72         struct wm831x *wm831x = dev_get_drvdata(dev);
  73
  74         return wm831x_device_suspend(wm831x);
  75 }
  76
  77 static int wm831x_spi_poweroff(struct device *dev)
  78 {
  79         struct wm831x *wm831x = dev_get_drvdata(dev);
  80
  81         wm831x_device_shutdown(wm831x);
  82
  83         return 0;
  84 }
  85
  86 static const struct dev_pm_ops wm831x_spi_pm = {
  87         .freeze = wm831x_spi_suspend,
  88         .suspend = wm831x_spi_suspend,
  89         .poweroff = wm831x_spi_poweroff,
  90 };
  91
  92 static const struct spi_device_id wm831x_spi_ids[] = {
  93         { "wm8310", WM8310 },
  94         { "wm8311", WM8311 },
  95         { "wm8312", WM8312 },
  96         { "wm8320", WM8320 },
  97         { "wm8321", WM8321 },
  98         { "wm8325", WM8325 },
  99         { "wm8326", WM8326 },
 100         { },
 101 };
 102
 103 static struct spi_driver wm831x_spi_driver = {
 104         .driver = {
 105                 .name   = "wm831x",
 106                 .pm     = &wm831x_spi_pm,
 107                 .of_match_table = of_match_ptr(wm831x_of_match),
 108                 .suppress_bind_attrs = true,
 109         },
 110         .id_table       = wm831x_spi_ids,
 111         .probe          = wm831x_spi_probe,
 112 };
 113
 114 static int __init wm831x_spi_init(void)
 115 {
 116         int ret;
 117
 118         ret = spi_register_driver(&wm831x_spi_driver);
 119         if (ret != 0)
 120                 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
 121
 122         return 0;
 123 }
 124 subsys_initcall(wm831x_spi_init);