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 (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
94err:
95	i2c_unregister_device(bcm590xx->i2c_sec);
96	return ret;
97}
98
99static int bcm590xx_i2c_remove(struct i2c_client *i2c)
100{
101	mfd_remove_devices(&i2c->dev);
102	return 0;
103}
104
105static const struct of_device_id bcm590xx_of_match[] = {
106	{ .compatible = "brcm,bcm59056" },
107	{ }
108};
109MODULE_DEVICE_TABLE(of, bcm590xx_of_match);
110
111static const struct i2c_device_id bcm590xx_i2c_id[] = {
112	{ "bcm59056" },
113	{ }
114};
115MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
116
117static struct i2c_driver bcm590xx_i2c_driver = {
118	.driver = {
119		   .name = "bcm590xx",
120		   .owner = THIS_MODULE,
121		   .of_match_table = of_match_ptr(bcm590xx_of_match),
122	},
123	.probe = bcm590xx_i2c_probe,
124	.remove = bcm590xx_i2c_remove,
125	.id_table = bcm590xx_i2c_id,
126};
127module_i2c_driver(bcm590xx_i2c_driver);
128
129MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
130MODULE_DESCRIPTION("BCM590xx multi-function driver");
131MODULE_LICENSE("GPL v2");
132MODULE_ALIAS("i2c:bcm590xx");
133