diff options
Diffstat (limited to 'drivers/mfd/max77686.c')
| -rw-r--r-- | drivers/mfd/max77686.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/drivers/mfd/max77686.c b/drivers/mfd/max77686.c new file mode 100644 index 000000000000..c03e12b51924 --- /dev/null +++ b/drivers/mfd/max77686.c @@ -0,0 +1,187 @@ +/* + * max77686.c - mfd core driver for the Maxim 77686 + * + * Copyright (C) 2012 Samsung Electronics + * Chiwoong Byun <woong.byun@smasung.com> + * Jonghwa Lee <jonghwa3.lee@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * This driver is based on max8997.c + */ + +#include <linux/export.h> +#include <linux/slab.h> +#include <linux/i2c.h> +#include <linux/pm_runtime.h> +#include <linux/module.h> +#include <linux/mfd/core.h> +#include <linux/mfd/max77686.h> +#include <linux/mfd/max77686-private.h> +#include <linux/err.h> + +#define I2C_ADDR_RTC (0x0C >> 1) + +static struct mfd_cell max77686_devs[] = { + { .name = "max77686-pmic", }, + { .name = "max77686-rtc", }, +}; + +static struct regmap_config max77686_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +#ifdef CONFIG_OF +static struct of_device_id __devinitdata max77686_pmic_dt_match[] = { + {.compatible = "maxim,max77686", .data = 0}, + {}, +}; + +static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device + *dev) +{ + struct max77686_platform_data *pd; + + pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL); + if (!pd) { + dev_err(dev, "could not allocate memory for pdata\n"); + return NULL; + } + + dev->platform_data = pd; + return pd; +} +#else +static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device + *dev) +{ + return 0; +} +#endif + +static int max77686_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct max77686_dev *max77686 = NULL; + struct max77686_platform_data *pdata = i2c->dev.platform_data; + unsigned int data; + int ret = 0; + + if (i2c->dev.of_node) + pdata = max77686_i2c_parse_dt_pdata(&i2c->dev); + + if (!pdata) { + ret = -EIO; + dev_err(&i2c->dev, "No platform data found.\n"); + goto err; + } + + max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL); + if (max77686 == NULL) + return -ENOMEM; + + max77686->regmap = regmap_init_i2c(i2c, &max77686_regmap_config); + if (IS_ERR(max77686->regmap)) { + ret = PTR_ERR(max77686->regmap); + dev_err(max77686->dev, "Failed to allocate register map: %d\n", + ret); + kfree(max77686); + return ret; + } + + i2c_set_clientdata(i2c, max77686); + max77686->dev = &i2c->dev; + max77686->i2c = i2c; + max77686->type = id->driver_data; + + max77686->wakeup = pdata->wakeup; + max77686->irq_gpio = pdata->irq_gpio; + max77686->irq = i2c->irq; + + if (regmap_read(max77686->regmap, + MAX77686_REG_DEVICE_ID, &data) < 0) { + dev_err(max77686->dev, + "device not found on this channel (this is not an error)\n"); + ret = -ENODEV; + goto err; + } else + dev_info(max77686->dev, "device found\n"); + + max77686->rtc = i2c_new_dummy(i2c->adapter, I2C_ADDR_RTC); + i2c_set_clientdata(max77686->rtc, max77686); + + max77686_irq_init(max77686); + + ret = mfd_add_devices(max77686->dev, -1, max77686_devs, + ARRAY_SIZE(max77686_devs), NULL, 0); + + if (ret < 0) + goto err_mfd; + + return ret; + +err_mfd: + mfd_remove_devices(max77686->dev); + i2c_unregister_device(max77686->rtc); +err: + kfree(max77686); + return ret; +} + +static int max77686_i2c_remove(struct i2c_client *i2c) +{ + struct max77686_dev *max77686 = i2c_get_clientdata(i2c); + + mfd_remove_devices(max77686->dev); + i2c_unregister_device(max77686->rtc); + kfree(max77686); + + return 0; +} + +static const struct i2c_device_id max77686_i2c_id[] = { + { "max77686", TYPE_MAX77686 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, max77686_i2c_id); + +static struct i2c_driver max77686_i2c_driver = { + .driver = { + .name = "max77686", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(max77686_pmic_dt_match), + }, + .probe = max77686_i2c_probe, + .remove = max77686_i2c_remove, + .id_table = max77686_i2c_id, +}; + +static int __init max77686_i2c_init(void) +{ + return i2c_add_driver(&max77686_i2c_driver); +} +/* init early so consumer devices can complete system boot */ +subsys_initcall(max77686_i2c_init); + +static void __exit max77686_i2c_exit(void) +{ + i2c_del_driver(&max77686_i2c_driver); +} +module_exit(max77686_i2c_exit); + +MODULE_DESCRIPTION("MAXIM 77686 multi-function core driver"); +MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); +MODULE_LICENSE("GPL"); |