drivers/mfd/wm831x-spi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * wm831x-spi.c  --  SPI access for Wolfson WM831x PMICs
   4  *
   5  * Copyright 2009,2010 Wolfson Microelectronics PLC.
   6  *
   7  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/of.h>
  13 #include <linux/of_device.h>
  14 #include <linux/pm.h>
  15 #include <linux/spi/spi.h>
  16 #include <linux/regmap.h>
  17 #include <linux/err.h>
  18
  19 #include <linux/mfd/wm831x/core.h>
  20
  21 static int wm831x_spi_probe(struct spi_device *spi)
  22 {
  23         struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev);
  24         const struct spi_device_id *id = spi_get_device_id(spi);
  25         const struct of_device_id *of_id;
  26         struct wm831x *wm831x;
  27         enum wm831x_parent type;
  28         int ret;
  29
  30         if (spi->dev.of_node) {
  31                 of_id = of_match_device(wm831x_of_match, &spi->dev);
  32                 if (!of_id) {
  33                         dev_err(&spi->dev, "Failed to match device\n");
  34                         return -ENODEV;
  35                 }
  36                 type = (enum wm831x_parent)of_id->data;
  37         } else {
  38                 type = (enum wm831x_parent)id->driver_data;
  39         }
  40
  41         wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
  42         if (wm831x == NULL)
  43                 return -ENOMEM;
  44
  45         spi->mode = SPI_MODE_0;
  46
  47         spi_set_drvdata(spi, wm831x);
  48         wm831x->dev = &spi->dev;
  49         wm831x->type = type;
  50
  51         wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
  52         if (IS_ERR(wm831x->regmap)) {
  53                 ret = PTR_ERR(wm831x->regmap);
  54                 dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
  55                         ret);
  56                 return ret;
  57         }
  58
  59         if (pdata)
  60                 memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
  61
  62         return wm831x_device_init(wm831x, spi->irq);
  63 }
  64
  65 static int wm831x_spi_suspend(struct device *dev)
  66 {
  67         struct wm831x *wm831x = dev_get_drvdata(dev);
  68
  69         return wm831x_device_suspend(wm831x);
  70 }
  71
  72 static int wm831x_spi_poweroff(struct device *dev)
  73 {
  74         struct wm831x *wm831x = dev_get_drvdata(dev);
  75
  76         wm831x_device_shutdown(wm831x);
  77
  78         return 0;
  79 }
  80
  81 static const struct dev_pm_ops wm831x_spi_pm = {
  82         .freeze = wm831x_spi_suspend,
  83         .suspend = wm831x_spi_suspend,
  84         .poweroff = wm831x_spi_poweroff,
  85 };
  86
  87 static const struct spi_device_id wm831x_spi_ids[] = {
  88         { "wm8310", WM8310 },
  89         { "wm8311", WM8311 },
  90         { "wm8312", WM8312 },
  91         { "wm8320", WM8320 },
  92         { "wm8321", WM8321 },
  93         { "wm8325", WM8325 },
  94         { "wm8326", WM8326 },
  95         { },
  96 };
  97
  98 static struct spi_driver wm831x_spi_driver = {
  99         .driver = {
 100                 .name   = "wm831x",
 101                 .pm     = &wm831x_spi_pm,
 102                 .of_match_table = of_match_ptr(wm831x_of_match),
 103                 .suppress_bind_attrs = true,
 104         },
 105         .id_table       = wm831x_spi_ids,
 106         .probe          = wm831x_spi_probe,
 107 };
 108
 109 static int __init wm831x_spi_init(void)
 110 {
 111         int ret;
 112
 113         ret = spi_register_driver(&wm831x_spi_driver);
 114         if (ret != 0)
 115                 pr_err("Failed to register WM831x SPI driver: %d\n", ret);
 116
 117         return 0;
 118 }
 119 subsys_initcall(wm831x_spi_init);