LXR linux/drivers/mfd/bcm590xx.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Broadcom BCM590xx PMU
   4 *
   5 * Copyright 2014 Linaro Limited
   6 * Author: Matt Porter <mporter@linaro.org>
   7 */
   8
   9#include <linux/err.h>
  10#include <linux/i2c.h>
  11#include <linux/init.h>
  12#include <linux/mfd/bcm590xx.h>
  13#include <linux/mfd/core.h>
  14#include <linux/module.h>
  15#include <linux/moduleparam.h>
  16#include <linux/of.h>
  17#include <linux/of_device.h>
  18#include <linux/regmap.h>
  19#include <linux/slab.h>
  20
  21static const struct mfd_cell bcm590xx_devs[] = {
  22        {
  23                .name = "bcm590xx-vregs",
  24        },
  25};
  26
  27static const struct regmap_config bcm590xx_regmap_config_pri = {
  28        .reg_bits       = 8,
  29        .val_bits       = 8,
  30        .max_register   = BCM590XX_MAX_REGISTER_PRI,
  31        .cache_type     = REGCACHE_RBTREE,
  32};
  33
  34static const struct regmap_config bcm590xx_regmap_config_sec = {
  35        .reg_bits       = 8,
  36        .val_bits       = 8,
  37        .max_register   = BCM590XX_MAX_REGISTER_SEC,
  38        .cache_type     = REGCACHE_RBTREE,
  39};
  40
  41static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri,
  42                              const struct i2c_device_id *id)
  43{
  44        struct bcm590xx *bcm590xx;
  45        int ret;
  46
  47        bcm590xx = devm_kzalloc(&i2c_pri->dev, sizeof(*bcm590xx), GFP_KERNEL);
  48        if (!bcm590xx)
  49                return -ENOMEM;
  50
  51        i2c_set_clientdata(i2c_pri, bcm590xx);
  52        bcm590xx->dev = &i2c_pri->dev;
  53        bcm590xx->i2c_pri = i2c_pri;
  54
  55        bcm590xx->regmap_pri = devm_regmap_init_i2c(i2c_pri,
  56                                                 &bcm590xx_regmap_config_pri);
  57        if (IS_ERR(bcm590xx->regmap_pri)) {
  58                ret = PTR_ERR(bcm590xx->regmap_pri);
  59                dev_err(&i2c_pri->dev, "primary regmap init failed: %d\n", ret);
  60                return ret;
  61        }
  62
  63        /* Secondary I2C slave address is the base address with A(2) asserted */
  64        bcm590xx->i2c_sec = i2c_new_dummy_device(i2c_pri->adapter,
  65                                          i2c_pri->addr | BIT(2));
  66        if (IS_ERR(bcm590xx->i2c_sec)) {
  67                dev_err(&i2c_pri->dev, "failed to add secondary I2C device\n");
  68                return PTR_ERR(bcm590xx->i2c_sec);
  69        }
  70        i2c_set_clientdata(bcm590xx->i2c_sec, bcm590xx);
  71
  72        bcm590xx->regmap_sec = devm_regmap_init_i2c(bcm590xx->i2c_sec,
  73                                                &bcm590xx_regmap_config_sec);
  74        if (IS_ERR(bcm590xx->regmap_sec)) {
  75                ret = PTR_ERR(bcm590xx->regmap_sec);
  76                dev_err(&bcm590xx->i2c_sec->dev,
  77                        "secondary regmap init failed: %d\n", ret);
  78                goto err;
  79        }
  80
  81        ret = devm_mfd_add_devices(&i2c_pri->dev, -1, bcm590xx_devs,
  82                                   ARRAY_SIZE(bcm590xx_devs), NULL, 0, NULL);
  83        if (ret < 0) {
  84                dev_err(&i2c_pri->dev, "failed to add sub-devices: %d\n", ret);
  85                goto err;
  86        }
  87
  88        return 0;
  89
  90err:
  91        i2c_unregister_device(bcm590xx->i2c_sec);
  92        return ret;
  93}
  94
  95static const struct of_device_id bcm590xx_of_match[] = {
  96        { .compatible = "brcm,bcm59056" },
  97        { }
  98};
  99MODULE_DEVICE_TABLE(of, bcm590xx_of_match);
 100
 101static const struct i2c_device_id bcm590xx_i2c_id[] = {
 102        { "bcm59056" },
 103        { }
 104};
 105MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
 106
 107static struct i2c_driver bcm590xx_i2c_driver = {
 108        .driver = {
 109                   .name = "bcm590xx",
 110                   .of_match_table = bcm590xx_of_match,
 111        },
 112        .probe = bcm590xx_i2c_probe,
 113        .id_table = bcm590xx_i2c_id,
 114};
 115module_i2c_driver(bcm590xx_i2c_driver);
 116
 117MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
 118MODULE_DESCRIPTION("BCM590xx multi-function driver");
 119MODULE_LICENSE("GPL v2");
 120