drivers/mfd/sky81452.c

   1 /*
   2  * sky81452.c   SKY81452 MFD driver
   3  *
   4  * Copyright 2014 Skyworks Solutions Inc.
   5  * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2
   9  * as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/err.h>
  24 #include <linux/slab.h>
  25 #include <linux/i2c.h>
  26 #include <linux/regmap.h>
  27 #include <linux/mfd/core.h>
  28 #include <linux/mfd/sky81452.h>
  29
  30 static const struct regmap_config sky81452_config = {
  31         .reg_bits = 8,
  32         .val_bits = 8,
  33 };
  34
  35 static int sky81452_probe(struct i2c_client *client,
  36                                 const struct i2c_device_id *id)
  37 {
  38         struct device *dev = &client->dev;
  39         const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
  40         struct mfd_cell cells[2];
  41         struct regmap *regmap;
  42         int ret;
  43
  44         if (!pdata) {
  45                 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
  46                 if (!pdata)
  47                         return -ENOMEM;
  48         }
  49
  50         regmap = devm_regmap_init_i2c(client, &sky81452_config);
  51         if (IS_ERR(regmap)) {
  52                 dev_err(dev, "failed to initialize.err=%ld\n", PTR_ERR(regmap));
  53                 return PTR_ERR(regmap);
  54         }
  55
  56         i2c_set_clientdata(client, regmap);
  57
  58         memset(cells, 0, sizeof(cells));
  59         cells[0].name = "sky81452-backlight";
  60         cells[0].of_compatible = "skyworks,sky81452-backlight";
  61         cells[0].platform_data = pdata->bl_pdata;
  62         cells[0].pdata_size = sizeof(*pdata->bl_pdata);
  63         cells[1].name = "sky81452-regulator";
  64         cells[1].platform_data = pdata->regulator_init_data;
  65         cells[1].pdata_size = sizeof(*pdata->regulator_init_data);
  66
  67         ret = mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells), NULL, 0, NULL);
  68         if (ret)
  69                 dev_err(dev, "failed to add child devices. err=%d\n", ret);
  70
  71         return ret;
  72 }
  73
  74 static int sky81452_remove(struct i2c_client *client)
  75 {
  76         mfd_remove_devices(&client->dev);
  77         return 0;
  78 }
  79
  80 static const struct i2c_device_id sky81452_ids[] = {
  81         { "sky81452" },
  82         { }
  83 };
  84 MODULE_DEVICE_TABLE(i2c, sky81452_ids);
  85
  86 #ifdef CONFIG_OF
  87 static const struct of_device_id sky81452_of_match[] = {
  88         { .compatible = "skyworks,sky81452", },
  89         { }
  90 };
  91 MODULE_DEVICE_TABLE(of, sky81452_of_match);
  92 #endif
  93
  94 static struct i2c_driver sky81452_driver = {
  95         .driver = {
  96                 .name = "sky81452",
  97                 .of_match_table = of_match_ptr(sky81452_of_match),
  98         },
  99         .probe = sky81452_probe,
 100         .remove = sky81452_remove,
 101         .id_table = sky81452_ids,
 102 };
 103
 104 module_i2c_driver(sky81452_driver);
 105
 106 MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
 107 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
 108 MODULE_LICENSE("GPL v2");