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