181 lines
4.6 KiB
C
181 lines
4.6 KiB
C
/*
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* max77686.c - mfd core driver for the Maxim 77686
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*
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* Copyright (C) 2012 Samsung Electronics
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* Chiwoong Byun <woong.byun@smasung.com>
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* Jonghwa Lee <jonghwa3.lee@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This driver is based on max8997.c
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*/
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/pm_runtime.h>
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#include <linux/module.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/max77686.h>
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#include <linux/mfd/max77686-private.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#define I2C_ADDR_RTC (0x0C >> 1)
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static struct mfd_cell max77686_devs[] = {
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{ .name = "max77686-pmic", },
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{ .name = "max77686-rtc", },
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{ .name = "max77686-clk", },
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};
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static struct regmap_config max77686_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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#ifdef CONFIG_OF
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static struct of_device_id max77686_pmic_dt_match[] = {
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{.compatible = "maxim,max77686", .data = NULL},
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{},
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};
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static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
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*dev)
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{
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struct max77686_platform_data *pd;
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pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
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if (!pd) {
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dev_err(dev, "could not allocate memory for pdata\n");
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return NULL;
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}
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dev->platform_data = pd;
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return pd;
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}
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#else
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static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
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*dev)
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{
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return 0;
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}
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#endif
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static int max77686_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct max77686_dev *max77686 = NULL;
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struct max77686_platform_data *pdata = dev_get_platdata(&i2c->dev);
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unsigned int data;
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int ret = 0;
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if (i2c->dev.of_node)
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pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
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if (!pdata) {
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dev_err(&i2c->dev, "No platform data found.\n");
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return -EIO;
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}
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max77686 = devm_kzalloc(&i2c->dev,
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sizeof(struct max77686_dev), GFP_KERNEL);
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if (max77686 == NULL)
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return -ENOMEM;
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i2c_set_clientdata(i2c, max77686);
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max77686->dev = &i2c->dev;
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max77686->i2c = i2c;
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max77686->type = id->driver_data;
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max77686->wakeup = pdata->wakeup;
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max77686->irq_gpio = pdata->irq_gpio;
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max77686->irq = i2c->irq;
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max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config);
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if (IS_ERR(max77686->regmap)) {
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ret = PTR_ERR(max77686->regmap);
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dev_err(max77686->dev, "Failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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if (regmap_read(max77686->regmap,
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MAX77686_REG_DEVICE_ID, &data) < 0) {
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dev_err(max77686->dev,
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"device not found on this channel (this is not an error)\n");
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return -ENODEV;
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} else
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dev_info(max77686->dev, "device found\n");
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max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC);
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i2c_set_clientdata(max77686->rtc, max77686);
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max77686_irq_init(max77686);
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ret = mfd_add_devices(max77686->dev, -1, max77686_devs,
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ARRAY_SIZE(max77686_devs), NULL, 0, NULL);
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if (ret < 0) {
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mfd_remove_devices(max77686->dev);
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i2c_unregister_device(max77686->rtc);
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}
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return ret;
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}
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static int max77686_i2c_remove(struct i2c_client *i2c)
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{
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struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
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mfd_remove_devices(max77686->dev);
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i2c_unregister_device(max77686->rtc);
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return 0;
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}
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static const struct i2c_device_id max77686_i2c_id[] = {
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{ "max77686", TYPE_MAX77686 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);
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static struct i2c_driver max77686_i2c_driver = {
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.driver = {
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.name = "max77686",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(max77686_pmic_dt_match),
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},
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.probe = max77686_i2c_probe,
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.remove = max77686_i2c_remove,
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.id_table = max77686_i2c_id,
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};
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static int __init max77686_i2c_init(void)
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{
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return i2c_add_driver(&max77686_i2c_driver);
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}
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/* init early so consumer devices can complete system boot */
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subsys_initcall(max77686_i2c_init);
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static void __exit max77686_i2c_exit(void)
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{
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i2c_del_driver(&max77686_i2c_driver);
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}
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module_exit(max77686_i2c_exit);
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MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver");
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MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>");
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MODULE_LICENSE("GPL");
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