diff options
Diffstat (limited to 'drivers/mfd/ltc3589-i2c.c')
| -rw-r--r-- | drivers/mfd/ltc3589-i2c.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/drivers/mfd/ltc3589-i2c.c b/drivers/mfd/ltc3589-i2c.c new file mode 100644 index 000000000000..db0017e30827 --- /dev/null +++ b/drivers/mfd/ltc3589-i2c.c @@ -0,0 +1,121 @@ +/* + * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved. + * + * 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., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +/*! + * @file ltc3589-i2c.c + * @brief This is the generic I2C driver for Linear 3589 PMIC. + * + * @ingroup PMIC_CORE + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/init.h> +#include <linux/i2c.h> +#include <linux/platform_device.h> +#include <linux/mfd/ltc3589/core.h> +#include <linux/uaccess.h> +#include <linux/slab.h> + +static inline int ltc3589_i2c_read(struct ltc3589 *ltc, u8 reg) +{ + return i2c_smbus_read_byte_data(ltc->i2c_client, reg); +} + +static inline int ltc3589_i2c_write(struct ltc3589 *ltc, u8 reg, u8 val) +{ + return i2c_smbus_write_byte_data(ltc->i2c_client, reg, val); +} + +static int ltc3589_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct ltc3589 *ltc3589; + struct ltc3589_platform_data *plat_data = i2c->dev.platform_data; + int ret = 0; + + ltc3589 = kzalloc(sizeof(struct ltc3589), GFP_KERNEL); + if (ltc3589 == NULL) + return -ENOMEM; + + i2c_set_clientdata(i2c, ltc3589); + ltc3589->dev = &i2c->dev; + ltc3589->i2c_client = i2c; + ltc3589->read_dev = ltc3589_i2c_read; + ltc3589->write_dev = ltc3589_i2c_write; + + if (ltc3589_i2c_read(ltc3589, 0x33) < 0) { + kfree(ltc3589); + return -ENODEV; + } + + /* so far, we got matched chip on board */ + + ltc3589_client = i2c; + if (plat_data && plat_data->init) { + ret = plat_data->init(ltc3589); + if (ret != 0) + return -EINVAL; + } + + dev_info(&i2c->dev, "Loaded\n"); + + return 0; +} + +static int ltc3589_i2c_remove(struct i2c_client *i2c) +{ + struct ltc3589 *ltc3589 = i2c_get_clientdata(i2c); + + kfree(ltc3589); + return 0; +} + +static const struct i2c_device_id ltc3589_id[] = { + { "ltc3589", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ltc3589_id); + + +static struct i2c_driver ltc3589_i2c_driver = { + .driver = { + .name = "ltc3589", + .owner = THIS_MODULE, + }, + .probe = ltc3589_i2c_probe, + .remove = ltc3589_i2c_remove, + .id_table = ltc3589_id, +}; + +static int __init ltc3589_i2c_init(void) +{ + return i2c_add_driver(<c3589_i2c_driver); +} +/* init early so consumer devices can complete system boot */ +subsys_initcall(ltc3589_i2c_init); + +static void __exit ltc3589_i2c_exit(void) +{ + i2c_del_driver(<c3589_i2c_driver); +} +module_exit(ltc3589_i2c_exit); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("I2C support for the Linear PMIC"); +MODULE_LICENSE("GPL"); |