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 <[email protected]>
   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
  21 static const struct mfd_cell bcm590xx_devs[] = {
  22         {
  23                 .name = "bcm590xx-vregs",
  24         },
  25 };
  26
  27 static 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
  34 static 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
  41 static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri)
  42 {
  43         struct bcm590xx *bcm590xx;
  44         int ret;
  45
  46         bcm590xx = devm_kzalloc(&i2c_pri->dev, sizeof(*bcm590xx), GFP_KERNEL);
  47         if (!bcm590xx)
  48                 return -ENOMEM;
  49
  50         i2c_set_clientdata(i2c_pri, bcm590xx);
  51         bcm590xx->dev = &i2c_pri->dev;
  52         bcm590xx->i2c_pri = i2c_pri;
  53
  54         bcm590xx->regmap_pri = devm_regmap_init_i2c(i2c_pri,
  55                                                  &bcm590xx_regmap_config_pri);
  56         if (IS_ERR(bcm590xx->regmap_pri)) {
  57                 ret = PTR_ERR(bcm590xx->regmap_pri);
  58                 dev_err(&i2c_pri->dev, "primary regmap init failed: %d\n", ret);
  59                 return ret;
  60         }
  61
  62         /* Secondary I2C slave address is the base address with A(2) asserted */
  63         bcm590xx->i2c_sec = i2c_new_dummy_device(i2c_pri->adapter,
  64                                           i2c_pri->addr | BIT(2));
  65         if (IS_ERR(bcm590xx->i2c_sec)) {
  66                 dev_err(&i2c_pri->dev, "failed to add secondary I2C device\n");
  67                 return PTR_ERR(bcm590xx->i2c_sec);
  68         }
  69         i2c_set_clientdata(bcm590xx->i2c_sec, bcm590xx);
  70
  71         bcm590xx->regmap_sec = devm_regmap_init_i2c(bcm590xx->i2c_sec,
  72                                                 &bcm590xx_regmap_config_sec);
  73         if (IS_ERR(bcm590xx->regmap_sec)) {
  74                 ret = PTR_ERR(bcm590xx->regmap_sec);
  75                 dev_err(&bcm590xx->i2c_sec->dev,
  76                         "secondary regmap init failed: %d\n", ret);
  77                 goto err;
  78         }
  79
  80         ret = devm_mfd_add_devices(&i2c_pri->dev, -1, bcm590xx_devs,
  81                                    ARRAY_SIZE(bcm590xx_devs), NULL, 0, NULL);
  82         if (ret < 0) {
  83                 dev_err(&i2c_pri->dev, "failed to add sub-devices: %d\n", ret);
  84                 goto err;
  85         }
  86
  87         return 0;
  88
  89 err:
  90         i2c_unregister_device(bcm590xx->i2c_sec);
  91         return ret;
  92 }
  93
  94 static const struct of_device_id bcm590xx_of_match[] = {
  95         { .compatible = "brcm,bcm59056" },
  96         { }
  97 };
  98 MODULE_DEVICE_TABLE(of, bcm590xx_of_match);
  99
 100 static const struct i2c_device_id bcm590xx_i2c_id[] = {
 101         { "bcm59056" },
 102         { }
 103 };
 104 MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
 105
 106 static struct i2c_driver bcm590xx_i2c_driver = {
 107         .driver = {
 108                    .name = "bcm590xx",
 109                    .of_match_table = bcm590xx_of_match,
 110         },
 111         .probe_new = bcm590xx_i2c_probe,
 112         .id_table = bcm590xx_i2c_id,
 113 };
 114 module_i2c_driver(bcm590xx_i2c_driver);
 115
 116 MODULE_AUTHOR("Matt Porter <[email protected]>");
 117 MODULE_DESCRIPTION("BCM590xx multi-function driver");
 118 MODULE_LICENSE("GPL v2");