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
 25static const struct mfd_cell bcm590xx_devs[] = {
 26	{
 27		.name = "bcm590xx-vregs",
 28	},
 29};
 30
 31static 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
 38static 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
 45static 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 (!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 = devm_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
 94err:
 95	i2c_unregister_device(bcm590xx->i2c_sec);
 96	return ret;
 97}
 98
 99static const struct of_device_id bcm590xx_of_match[] = {
100	{ .compatible = "brcm,bcm59056" },
101	{ }
102};
103MODULE_DEVICE_TABLE(of, bcm590xx_of_match);
104
105static const struct i2c_device_id bcm590xx_i2c_id[] = {
106	{ "bcm59056" },
107	{ }
108};
109MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
110
111static struct i2c_driver bcm590xx_i2c_driver = {
112	.driver = {
113		   .name = "bcm590xx",
114		   .of_match_table = of_match_ptr(bcm590xx_of_match),
115	},
116	.probe = bcm590xx_i2c_probe,
117	.id_table = bcm590xx_i2c_id,
118};
119module_i2c_driver(bcm590xx_i2c_driver);
120
121MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
122MODULE_DESCRIPTION("BCM590xx multi-function driver");
123MODULE_LICENSE("GPL v2");