drivers/mfd/bcm590xx.c

   1 /*
   2  * Broadcom BCM590xx PMU
   3  *
   4  * Copyright 2014 Linaro Limited
   5  * Author: Matt Porter <mporter@linaro.org>
   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 as published by the
   9  * Free Software Foundation;  either version 2 of the License, or (at your
  10  * option) any later version.
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/i2c.h>
  15 #include <linux/init.h>
  16 #include <linux/mfd/bcm590xx.h>
  17 #include <linux/mfd/core.h>
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/of.h>
  21 #include <linux/of_device.h>
  22 #include <linux/regmap.h>
  23 #include <linux/slab.h>
  24
  25 static const struct mfd_cell bcm590xx_devs[] = {
  26         {
  27                 .name = "bcm590xx-vregs",
  28         },
  29 };
  30
  31 static const struct regmap_config bcm590xx_regmap_config = {
  32         .reg_bits       = 8,
  33         .val_bits       = 8,
  34         .max_register   = BCM590XX_MAX_REGISTER,
  35         .cache_type     = REGCACHE_RBTREE,
  36 };
  37
  38 static int bcm590xx_i2c_probe(struct i2c_client *i2c,
  39                               const struct i2c_device_id *id)
  40 {
  41         struct bcm590xx *bcm590xx;
  42         int ret;
  43
  44         bcm590xx = devm_kzalloc(&i2c->dev, sizeof(*bcm590xx), GFP_KERNEL);
  45         if (!bcm590xx)
  46                 return -ENOMEM;
  47
  48         i2c_set_clientdata(i2c, bcm590xx);
  49         bcm590xx->dev = &i2c->dev;
  50         bcm590xx->i2c_client = i2c;
  51
  52         bcm590xx->regmap = devm_regmap_init_i2c(i2c, &bcm590xx_regmap_config);
  53         if (IS_ERR(bcm590xx->regmap)) {
  54                 ret = PTR_ERR(bcm590xx->regmap);
  55                 dev_err(&i2c->dev, "regmap initialization failed: %d\n", ret);
  56                 return ret;
  57         }
  58
  59         ret = mfd_add_devices(&i2c->dev, -1, bcm590xx_devs,
  60                               ARRAY_SIZE(bcm590xx_devs), NULL, 0, NULL);
  61         if (ret < 0)
  62                 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
  63
  64         return ret;
  65 }
  66
  67 static const struct of_device_id bcm590xx_of_match[] = {
  68         { .compatible = "brcm,bcm59056" },
  69         { }
  70 };
  71 MODULE_DEVICE_TABLE(of, bcm590xx_of_match);
  72
  73 static const struct i2c_device_id bcm590xx_i2c_id[] = {
  74         { "bcm59056" },
  75         { }
  76 };
  77 MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
  78
  79 static struct i2c_driver bcm590xx_i2c_driver = {
  80         .driver = {
  81                    .name = "bcm590xx",
  82                    .owner = THIS_MODULE,
  83                    .of_match_table = of_match_ptr(bcm590xx_of_match),
  84         },
  85         .probe = bcm590xx_i2c_probe,
  86         .id_table = bcm590xx_i2c_id,
  87 };
  88 module_i2c_driver(bcm590xx_i2c_driver);
  89
  90 MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
  91 MODULE_DESCRIPTION("BCM590xx multi-function driver");
  92 MODULE_LICENSE("GPL v2");
  93 MODULE_ALIAS("platform:bcm590xx");