projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 4397c98a MF |
1 | /* |
| 2 | * AD7879-1/AD7889-1 touchscreen (I2C bus) | |
| 3 | * | |
| 4 | * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc. | |
| 5 | * | |
| 6 | * Licensed under the GPL-2 or later. | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/input.h> /* BUS_I2C */ | |
| 10 | #include <linux/i2c.h> | |
| 11 | #include <linux/module.h> | |
| 12 | #include <linux/types.h> | |
| 13 | ||
| 14 | #include "ad7879.h" | |
| 15 | ||
| 16 | #define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */ | |
| 17 | ||
| 18 | #ifdef CONFIG_PM | |
| 19 | static int ad7879_i2c_suspend(struct i2c_client *client, pm_message_t message) | |
| 20 | { | |
| 21 | struct ad7879 *ts = i2c_get_clientdata(client); | |
| 22 | ||
| 23 | ad7879_disable(ts); | |
| 24 | ||
| 25 | return 0; | |
| 26 | } | |
| 27 | ||
| 28 | static int ad7879_i2c_resume(struct i2c_client *client) | |
| 29 | { | |
| 30 | struct ad7879 *ts = i2c_get_clientdata(client); | |
| 31 | ||
| 32 | ad7879_enable(ts); | |
| 33 | ||
| 34 | return 0; | |
| 35 | } | |
| 36 | #else | |
| 37 | # define ad7879_i2c_suspend NULL | |
| 38 | # define ad7879_i2c_resume NULL | |
| 39 | #endif | |
| 40 | ||
| 41 | /* All registers are word-sized. | |
| 42 | * AD7879 uses a high-byte first convention. | |
| 43 | */ | |
| 44 | static int ad7879_i2c_read(struct device *dev, u8 reg) | |
| 45 | { | |
| 46 | struct i2c_client *client = to_i2c_client(dev); | |
| 47 | ||
| 48 | return swab16(i2c_smbus_read_word_data(client, reg)); | |
| 49 | } | |
| 50 | ||
| 51 | static int ad7879_i2c_multi_read(struct device *dev, | |
| 52 | u8 first_reg, u8 count, u16 *buf) | |
| 53 | { | |
| 54 | u8 idx; | |
| 55 | ||
| 56 | for (idx = 0; idx < count; ++idx) | |
| 57 | buf[idx] = ad7879_i2c_read(dev, first_reg + idx); | |
| 58 | ||
| 59 | return 0; | |
| 60 | } | |
| 61 | ||
| 62 | static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val) | |
| 63 | { | |
| 64 | struct i2c_client *client = to_i2c_client(dev); | |
| 65 | ||
| 66 | return i2c_smbus_write_word_data(client, reg, swab16(val)); | |
| 67 | } | |
| 68 | ||
| 69 | static const struct ad7879_bus_ops ad7879_i2c_bus_ops = { | |
| 70 | .bustype = BUS_I2C, | |
| 71 | .read = ad7879_i2c_read, | |
| 72 | .multi_read = ad7879_i2c_multi_read, | |
| 73 | .write = ad7879_i2c_write, | |
| 74 | }; | |
| 75 | ||
| 76 | static int __devinit ad7879_i2c_probe(struct i2c_client *client, | |
| 77 | const struct i2c_device_id *id) | |
| 78 | { | |
| 79 | struct ad7879 *ts; | |
| 80 | ||
| 81 | if (!i2c_check_functionality(client->adapter, | |
| 82 | I2C_FUNC_SMBUS_WORD_DATA)) { | |
| 83 | dev_err(&client->dev, "SMBUS Word Data not Supported\n"); | |
| 84 | return -EIO; | |
| 85 | } | |
| 86 | ||
| 87 | ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq, | |
| 88 | &ad7879_i2c_bus_ops); | |
| 89 | if (IS_ERR(ts)) | |
| 90 | return PTR_ERR(ts); | |
| 91 | ||
| 92 | i2c_set_clientdata(client, ts); | |
| 93 | ||
| 94 | return 0; | |
| 95 | } | |
| 96 | ||
| 97 | static int __devexit ad7879_i2c_remove(struct i2c_client *client) | |
| 98 | { | |
| 99 | struct ad7879 *ts = i2c_get_clientdata(client); | |
| 100 | ||
| 101 | ad7879_remove(ts); | |
| 102 | ||
| 103 | return 0; | |
| 104 | } | |
| 105 | ||
| 106 | static const struct i2c_device_id ad7879_id[] = { | |
| 107 | { "ad7879", 0 }, | |
| 108 | { "ad7889", 0 }, | |
| 109 | { } | |
| 110 | }; | |
| 111 | MODULE_DEVICE_TABLE(i2c, ad7879_id); | |
| 112 | ||
| 113 | static struct i2c_driver ad7879_i2c_driver = { | |
| 114 | .driver = { | |
| 115 | .name = "ad7879", | |
| 116 | .owner = THIS_MODULE, | |
| 117 | }, | |
| 118 | .probe = ad7879_i2c_probe, | |
| 119 | .remove = __devexit_p(ad7879_i2c_remove), | |
| 120 | .suspend = ad7879_i2c_suspend, | |
| 121 | .resume = ad7879_i2c_resume, | |
| 122 | .id_table = ad7879_id, | |
| 123 | }; | |
| 124 | ||
| 125 | static int __init ad7879_i2c_init(void) | |
| 126 | { | |
| 127 | return i2c_add_driver(&ad7879_i2c_driver); | |
| 128 | } | |
| 129 | module_init(ad7879_i2c_init); | |
| 130 | ||
| 131 | static void __exit ad7879_i2c_exit(void) | |
| 132 | { | |
| 133 | i2c_del_driver(&ad7879_i2c_driver); | |
| 134 | } | |
| 135 | module_exit(ad7879_i2c_exit); | |
| 136 | ||
| 137 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
| 138 | MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver"); | |
| 139 | MODULE_LICENSE("GPL"); | |
| 140 | MODULE_ALIAS("i2c:ad7879"); |