drivers/mfd/sky81452.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sky81452.c   SKY81452 MFD driver
   4  *
   5  * Copyright 2014 Skyworks Solutions Inc.
   6  * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/err.h>
  13 #include <linux/slab.h>
  14 #include <linux/i2c.h>
  15 #include <linux/regmap.h>
  16 #include <linux/mfd/core.h>
  17 #include <linux/mfd/sky81452.h>
  18
  19 static const struct regmap_config sky81452_config = {
  20         .reg_bits = 8,
  21         .val_bits = 8,
  22 };
  23
  24 static int sky81452_probe(struct i2c_client *client,
  25                                 const struct i2c_device_id *id)
  26 {
  27         struct device *dev = &client->dev;
  28         const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
  29         struct mfd_cell cells[2];
  30         struct regmap *regmap;
  31         int ret;
  32
  33         if (!pdata) {
  34                 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
  35                 if (!pdata)
  36                         return -ENOMEM;
  37         }
  38
  39         regmap = devm_regmap_init_i2c(client, &sky81452_config);
  40         if (IS_ERR(regmap)) {
  41                 dev_err(dev, "failed to initialize.err=%ld\n", PTR_ERR(regmap));
  42                 return PTR_ERR(regmap);
  43         }
  44
  45         i2c_set_clientdata(client, regmap);
  46
  47         memset(cells, 0, sizeof(cells));
  48         cells[0].name = "sky81452-backlight";
  49         cells[0].of_compatible = "skyworks,sky81452-backlight";
  50         cells[1].name = "sky81452-regulator";
  51         cells[1].platform_data = pdata->regulator_init_data;
  52         cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
  53
  54         ret = devm_mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
  55                                    NULL, 0, NULL);
  56         if (ret)
  57                 dev_err(dev, "failed to add child devices. err=%d\n", ret);
  58
  59         return ret;
  60 }
  61
  62 static const struct i2c_device_id sky81452_ids[] = {
  63         { "sky81452" },
  64         { }
  65 };
  66 MODULE_DEVICE_TABLE(i2c, sky81452_ids);
  67
  68 #ifdef CONFIG_OF
  69 static const struct of_device_id sky81452_of_match[] = {
  70         { .compatible = "skyworks,sky81452", },
  71         { }
  72 };
  73 MODULE_DEVICE_TABLE(of, sky81452_of_match);
  74 #endif
  75
  76 static struct i2c_driver sky81452_driver = {
  77         .driver = {
  78                 .name = "sky81452",
  79                 .of_match_table = of_match_ptr(sky81452_of_match),
  80         },
  81         .probe = sky81452_probe,
  82         .id_table = sky81452_ids,
  83 };
  84
  85 module_i2c_driver(sky81452_driver);
  86
  87 MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
  88 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
  89 MODULE_LICENSE("GPL v2");