projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| e952805d WS |
1 | /* |
| 2 | * drivers/gpio/max7300.c | |
| 3 | * | |
| 4 | * Copyright (C) 2009 Wolfram Sang, Pengutronix | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * Check max730x.c for further details. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/module.h> | |
| 14 | #include <linux/init.h> | |
| 15 | #include <linux/platform_device.h> | |
| 16 | #include <linux/mutex.h> | |
| 17 | #include <linux/i2c.h> | |
| 18 | #include <linux/spi/max7301.h> | |
| 19 | ||
| 20 | static int max7300_i2c_write(struct device *dev, unsigned int reg, | |
| 21 | unsigned int val) | |
| 22 | { | |
| 23 | struct i2c_client *client = to_i2c_client(dev); | |
| 24 | ||
| 25 | return i2c_smbus_write_byte_data(client, reg, val); | |
| 26 | } | |
| 27 | ||
| 28 | static int max7300_i2c_read(struct device *dev, unsigned int reg) | |
| 29 | { | |
| 30 | struct i2c_client *client = to_i2c_client(dev); | |
| 31 | ||
| 32 | return i2c_smbus_read_byte_data(client, reg); | |
| 33 | } | |
| 34 | ||
| 35 | static int __devinit max7300_probe(struct i2c_client *client, | |
| 36 | const struct i2c_device_id *id) | |
| 37 | { | |
| 38 | struct max7301 *ts; | |
| 39 | int ret; | |
| 40 | ||
| 41 | if (!i2c_check_functionality(client->adapter, | |
| 42 | I2C_FUNC_SMBUS_BYTE_DATA)) | |
| 43 | return -EIO; | |
| 44 | ||
| 45 | ts = kzalloc(sizeof(struct max7301), GFP_KERNEL); | |
| 46 | if (!ts) | |
| 47 | return -ENOMEM; | |
| 48 | ||
| 49 | ts->read = max7300_i2c_read; | |
| 50 | ts->write = max7300_i2c_write; | |
| 51 | ts->dev = &client->dev; | |
| 52 | ||
| 53 | ret = __max730x_probe(ts); | |
| 54 | if (ret) | |
| 55 | kfree(ts); | |
| 56 | return ret; | |
| 57 | } | |
| 58 | ||
| 59 | static int __devexit max7300_remove(struct i2c_client *client) | |
| 60 | { | |
| 61 | return __max730x_remove(&client->dev); | |
| 62 | } | |
| 63 | ||
| 64 | static const struct i2c_device_id max7300_id[] = { | |
| 65 | { "max7300", 0 }, | |
| 66 | { } | |
| 67 | }; | |
| 68 | MODULE_DEVICE_TABLE(i2c, max7300_id); | |
| 69 | ||
| 70 | static struct i2c_driver max7300_driver = { | |
| 71 | .driver = { | |
| 72 | .name = "max7300", | |
| 73 | .owner = THIS_MODULE, | |
| 74 | }, | |
| 75 | .probe = max7300_probe, | |
| 76 | .remove = __devexit_p(max7300_remove), | |
| 77 | .id_table = max7300_id, | |
| 78 | }; | |
| 79 | ||
| 80 | static int __init max7300_init(void) | |
| 81 | { | |
| 82 | return i2c_add_driver(&max7300_driver); | |
| 83 | } | |
| 84 | subsys_initcall(max7300_init); | |
| 85 | ||
| 86 | static void __exit max7300_exit(void) | |
| 87 | { | |
| 88 | i2c_del_driver(&max7300_driver); | |
| 89 | } | |
| 90 | module_exit(max7300_exit); | |
| 91 | ||
| 92 | MODULE_AUTHOR("Wolfram Sang"); | |
| 93 | MODULE_LICENSE("GPL v2"); | |
| 94 | MODULE_DESCRIPTION("MAX7300 GPIO-Expander"); |