LXR linux/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
  30static const struct regmap_config sky81452_config = {
  31        .reg_bits = 8,
  32        .val_bits = 8,
  33};
  34
  35static 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 = devm_mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
  68                                   NULL, 0, NULL);
  69        if (ret)
  70                dev_err(dev, "failed to add child devices. err=%d\n", ret);
  71
  72        return ret;
  73}
  74
  75static const struct i2c_device_id sky81452_ids[] = {
  76        { "sky81452" },
  77        { }
  78};
  79MODULE_DEVICE_TABLE(i2c, sky81452_ids);
  80
  81#ifdef CONFIG_OF
  82static const struct of_device_id sky81452_of_match[] = {
  83        { .compatible = "skyworks,sky81452", },
  84        { }
  85};
  86MODULE_DEVICE_TABLE(of, sky81452_of_match);
  87#endif
  88
  89static struct i2c_driver sky81452_driver = {
  90        .driver = {
  91                .name = "sky81452",
  92                .of_match_table = of_match_ptr(sky81452_of_match),
  93        },
  94        .probe = sky81452_probe,
  95        .id_table = sky81452_ids,
  96};
  97
  98module_i2c_driver(sky81452_driver);
  99
 100MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
 101MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
 102MODULE_LICENSE("GPL v2");
 103