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_pri = {
  32         .reg_bits       = 8,
  33         .val_bits       = 8,
  34         .max_register   = BCM590XX_MAX_REGISTER_PRI,
  35         .cache_type     = REGCACHE_RBTREE,
  36 };
  37
  38 static const struct regmap_config bcm590xx_regmap_config_sec = {
  39         .reg_bits       = 8,
  40         .val_bits       = 8,
  41         .max_register   = BCM590XX_MAX_REGISTER_SEC,
  42         .cache_type     = REGCACHE_RBTREE,
  43 };
  44
  45 static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri,
  46                               const struct i2c_device_id *id)
  47 {
  48         struct bcm590xx *bcm590xx;
  49         int ret;
  50
  51         bcm590xx = devm_kzalloc(&i2c_pri->dev, sizeof(*bcm590xx), GFP_KERNEL);
  52         if (!bcm590xx)
  53                 return -ENOMEM;
  54
  55         i2c_set_clientdata(i2c_pri, bcm590xx);
  56         bcm590xx->dev = &i2c_pri->dev;
  57         bcm590xx->i2c_pri = i2c_pri;
  58
  59         bcm590xx->regmap_pri = devm_regmap_init_i2c(i2c_pri,
  60                                                  &bcm590xx_regmap_config_pri);
  61         if (IS_ERR(bcm590xx->regmap_pri)) {
  62                 ret = PTR_ERR(bcm590xx->regmap_pri);
  63                 dev_err(&i2c_pri->dev, "primary regmap init failed: %d\n", ret);
  64                 return ret;
  65         }
  66
  67         /* Secondary I2C slave address is the base address with A(2) asserted */
  68         bcm590xx->i2c_sec = i2c_new_dummy(i2c_pri->adapter,
  69                                           i2c_pri->addr | BIT(2));
  70         if (IS_ERR_OR_NULL(bcm590xx->i2c_sec)) {
  71                 dev_err(&i2c_pri->dev, "failed to add secondary I2C device\n");
  72                 return -ENODEV;
  73         }
  74         i2c_set_clientdata(bcm590xx->i2c_sec, bcm590xx);
  75
  76         bcm590xx->regmap_sec = devm_regmap_init_i2c(bcm590xx->i2c_sec,
  77                                                 &bcm590xx_regmap_config_sec);
  78         if (IS_ERR(bcm590xx->regmap_sec)) {
  79                 ret = PTR_ERR(bcm590xx->regmap_sec);
  80                 dev_err(&bcm590xx->i2c_sec->dev,
  81                         "secondary regmap init failed: %d\n", ret);
  82                 goto err;
  83         }
  84
  85         ret = mfd_add_devices(&i2c_pri->dev, -1, bcm590xx_devs,
  86                               ARRAY_SIZE(bcm590xx_devs), NULL, 0, NULL);
  87         if (ret < 0) {
  88                 dev_err(&i2c_pri->dev, "failed to add sub-devices: %d\n", ret);
  89                 goto err;
  90         }
  91
  92         return 0;
  93
  94 err:
  95         i2c_unregister_device(bcm590xx->i2c_sec);
  96         return ret;
  97 }
  98
  99 static int bcm590xx_i2c_remove(struct i2c_client *i2c)
 100 {
 101         mfd_remove_devices(&i2c->dev);
 102         return 0;
 103 }
 104
 105 static const struct of_device_id bcm590xx_of_match[] = {
 106         { .compatible = "brcm,bcm59056" },
 107         { }
 108 };
 109 MODULE_DEVICE_TABLE(of, bcm590xx_of_match);
 110
 111 static const struct i2c_device_id bcm590xx_i2c_id[] = {
 112         { "bcm59056" },
 113         { }
 114 };
 115 MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
 116
 117 static struct i2c_driver bcm590xx_i2c_driver = {
 118         .driver = {
 119                    .name = "bcm590xx",
 120                    .of_match_table = of_match_ptr(bcm590xx_of_match),
 121         },
 122         .probe = bcm590xx_i2c_probe,
 123         .remove = bcm590xx_i2c_remove,
 124         .id_table = bcm590xx_i2c_id,
 125 };
 126 module_i2c_driver(bcm590xx_i2c_driver);
 127
 128 MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
 129 MODULE_DESCRIPTION("BCM590xx multi-function driver");
 130 MODULE_LICENSE("GPL v2");
 131 MODULE_ALIAS("i2c:bcm590xx");