1/*
  2 * max77686.c - mfd core driver for the Maxim 77686
  3 *
  4 * Copyright (C) 2012 Samsung Electronics
  5 * Chiwoong Byun <woong.byun@smasung.com>
  6 * Jonghwa Lee <jonghwa3.lee@samsung.com>
  7 *
  8 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License as published by
 10 * the Free Software Foundation; either version 2 of the License, or
 11 * (at your option) any later version.
 12 *
 13 * This program is distributed in the hope that it will be useful,
 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16 * GNU General Public License for more details.
 17 *
 18 * You should have received a copy of the GNU General Public License
 19 * along with this program; if not, write to the Free Software
 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 21 *
 22 * This driver is based on max8997.c
 23 */
 24
 25#include <linux/export.h>
 26#include <linux/slab.h>
 27#include <linux/i2c.h>
 28#include <linux/pm_runtime.h>
 29#include <linux/module.h>
 30#include <linux/mfd/core.h>
 31#include <linux/mfd/max77686.h>
 32#include <linux/mfd/max77686-private.h>
 33#include <linux/err.h>
 34#include <linux/of.h>
 35
 36#define I2C_ADDR_RTC	(0x0C >> 1)
 37
 38static const struct mfd_cell max77686_devs[] = {
 39	{ .name = "max77686-pmic", },
 40	{ .name = "max77686-rtc", },
 41	{ .name = "max77686-clk", },
 42};
 43
 44static struct regmap_config max77686_regmap_config = {
 45	.reg_bits = 8,
 46	.val_bits = 8,
 47};
 48
 49#ifdef CONFIG_OF
 50static struct of_device_id max77686_pmic_dt_match[] = {
 51	{.compatible = "maxim,max77686", .data = NULL},
 52	{},
 53};
 54
 55static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
 56								  *dev)
 57{
 58	struct max77686_platform_data *pd;
 59
 60	pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
 61	if (!pd) {
 62		dev_err(dev, "could not allocate memory for pdata\n");
 63		return NULL;
 64	}
 65
 66	dev->platform_data = pd;
 67	return pd;
 68}
 69#else
 70static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
 71								  *dev)
 72{
 73	return 0;
 74}
 75#endif
 76
 77static int max77686_i2c_probe(struct i2c_client *i2c,
 78			      const struct i2c_device_id *id)
 79{
 80	struct max77686_dev *max77686 = NULL;
 81	struct max77686_platform_data *pdata = dev_get_platdata(&i2c->dev);
 82	unsigned int data;
 83	int ret = 0;
 84
 85	if (i2c->dev.of_node)
 86		pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
 87
 88	if (!pdata) {
 89		dev_err(&i2c->dev, "No platform data found.\n");
 90		return -EIO;
 91	}
 92
 93	max77686 = devm_kzalloc(&i2c->dev,
 94				sizeof(struct max77686_dev), GFP_KERNEL);
 95	if (max77686 == NULL)
 96		return -ENOMEM;
 97
 98	i2c_set_clientdata(i2c, max77686);
 99	max77686->dev = &i2c->dev;
100	max77686->i2c = i2c;
101	max77686->type = id->driver_data;
102
103	max77686->wakeup = pdata->wakeup;
104	max77686->irq_gpio = pdata->irq_gpio;
105	max77686->irq = i2c->irq;
106
107	max77686->regmap = devm_regmap_init_i2c(i2c, &max77686_regmap_config);
108	if (IS_ERR(max77686->regmap)) {
109		ret = PTR_ERR(max77686->regmap);
110		dev_err(max77686->dev, "Failed to allocate register map: %d\n",
111				ret);
112		return ret;
113	}
114
115	if (regmap_read(max77686->regmap,
116			 MAX77686_REG_DEVICE_ID, &data) < 0) {
117		dev_err(max77686->dev,
118			"device not found on this channel (this is not an error)\n");
119		return -ENODEV;
120	} else
121		dev_info(max77686->dev, "device found\n");
122
123	max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
124	if (!max77686->rtc) {
125		dev_err(max77686->dev, "Failed to allocate I2C device for RTC\n");
126		return -ENODEV;
127	}
128	i2c_set_clientdata(max77686->rtc, max77686);
129
130	max77686_irq_init(max77686);
131
132	ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
133			      ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
134	if (ret < 0) {
135		mfd_remove_devices(max77686->dev);
136		i2c_unregister_device(max77686->rtc);
137	}
138
139	return ret;
140}
141
142static int max77686_i2c_remove(struct i2c_client *i2c)
143{
144	struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
145
146	mfd_remove_devices(max77686->dev);
147	i2c_unregister_device(max77686->rtc);
148
149	return 0;
150}
151
152static const struct i2c_device_id max77686_i2c_id[] = {
153	{ "max77686", TYPE_MAX77686 },
154	{ }
155};
156MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
157
158static struct i2c_driver max77686_i2c_driver = {
159	.driver = {
160		   .name = "max77686",
161		   .owner = THIS_MODULE,
162		   .of_match_table = of_match_ptr(max77686_pmic_dt_match),
163	},
164	.probe = max77686_i2c_probe,
165	.remove = max77686_i2c_remove,
166	.id_table = max77686_i2c_id,
167};
168
169static int __init max77686_i2c_init(void)
170{
171	return i2c_add_driver(&max77686_i2c_driver);
172}
173/* init early so consumer devices can complete system boot */
174subsys_initcall(max77686_i2c_init);
175
176static void __exit max77686_i2c_exit(void)
177{
178	i2c_del_driver(&max77686_i2c_driver);
179}
180module_exit(max77686_i2c_exit);
181
182MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
183MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
184MODULE_LICENSE("GPL");