| /* |
| * AD7879-1/AD7889-1 touchscreen (I2C bus) |
| * |
| * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc. |
| * |
| * Licensed under the GPL-2 or later. |
| */ |
| |
| #include <linux/input.h> /* BUS_I2C */ |
| #include <linux/i2c.h> |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/pm.h> |
| |
| #include "ad7879.h" |
| |
| #define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */ |
| |
| /* All registers are word-sized. |
| * AD7879 uses a high-byte first convention. |
| */ |
| static int ad7879_i2c_read(struct device *dev, u8 reg) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| |
| return i2c_smbus_read_word_swapped(client, reg); |
| } |
| |
| static int ad7879_i2c_multi_read(struct device *dev, |
| u8 first_reg, u8 count, u16 *buf) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| u8 idx; |
| |
| i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf); |
| |
| for (idx = 0; idx < count; ++idx) |
| buf[idx] = swab16(buf[idx]); |
| |
| return 0; |
| } |
| |
| static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| |
| return i2c_smbus_write_word_swapped(client, reg, val); |
| } |
| |
| static const struct ad7879_bus_ops ad7879_i2c_bus_ops = { |
| .bustype = BUS_I2C, |
| .read = ad7879_i2c_read, |
| .multi_read = ad7879_i2c_multi_read, |
| .write = ad7879_i2c_write, |
| }; |
| |
| static int __devinit ad7879_i2c_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct ad7879 *ts; |
| |
| if (!i2c_check_functionality(client->adapter, |
| I2C_FUNC_SMBUS_WORD_DATA)) { |
| dev_err(&client->dev, "SMBUS Word Data not Supported\n"); |
| return -EIO; |
| } |
| |
| ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq, |
| &ad7879_i2c_bus_ops); |
| if (IS_ERR(ts)) |
| return PTR_ERR(ts); |
| |
| i2c_set_clientdata(client, ts); |
| |
| return 0; |
| } |
| |
| static int __devexit ad7879_i2c_remove(struct i2c_client *client) |
| { |
| struct ad7879 *ts = i2c_get_clientdata(client); |
| |
| ad7879_remove(ts); |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id ad7879_id[] = { |
| { "ad7879", 0 }, |
| { "ad7889", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, ad7879_id); |
| |
| static struct i2c_driver ad7879_i2c_driver = { |
| .driver = { |
| .name = "ad7879", |
| .owner = THIS_MODULE, |
| .pm = &ad7879_pm_ops, |
| }, |
| .probe = ad7879_i2c_probe, |
| .remove = __devexit_p(ad7879_i2c_remove), |
| .id_table = ad7879_id, |
| }; |
| |
| static int __init ad7879_i2c_init(void) |
| { |
| return i2c_add_driver(&ad7879_i2c_driver); |
| } |
| module_init(ad7879_i2c_init); |
| |
| static void __exit ad7879_i2c_exit(void) |
| { |
| i2c_del_driver(&ad7879_i2c_driver); |
| } |
| module_exit(ad7879_i2c_exit); |
| |
| MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver"); |
| MODULE_LICENSE("GPL"); |