Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 1 | /* |
| 2 | * AD714X CapTouch Programmable Controller driver (I2C bus) |
| 3 | * |
| 4 | * Copyright 2009 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 | #include "ad714x.h" |
| 14 | |
| 15 | #ifdef CONFIG_PM |
| 16 | static int ad714x_i2c_suspend(struct i2c_client *client, pm_message_t message) |
| 17 | { |
| 18 | return ad714x_disable(i2c_get_clientdata(client)); |
| 19 | } |
| 20 | |
| 21 | static int ad714x_i2c_resume(struct i2c_client *client) |
| 22 | { |
| 23 | return ad714x_enable(i2c_get_clientdata(client)); |
| 24 | } |
| 25 | #else |
| 26 | # define ad714x_i2c_suspend NULL |
| 27 | # define ad714x_i2c_resume NULL |
| 28 | #endif |
| 29 | |
| 30 | static int ad714x_i2c_write(struct device *dev, unsigned short reg, |
| 31 | unsigned short data) |
| 32 | { |
| 33 | struct i2c_client *client = to_i2c_client(dev); |
| 34 | int ret = 0; |
| 35 | u8 *_reg = (u8 *)® |
| 36 | u8 *_data = (u8 *)&data; |
| 37 | |
| 38 | u8 tx[4] = { |
| 39 | _reg[1], |
| 40 | _reg[0], |
| 41 | _data[1], |
| 42 | _data[0] |
| 43 | }; |
| 44 | |
| 45 | ret = i2c_master_send(client, tx, 4); |
| 46 | if (ret < 0) |
| 47 | dev_err(&client->dev, "I2C write error\n"); |
| 48 | |
| 49 | return ret; |
| 50 | } |
| 51 | |
| 52 | static int ad714x_i2c_read(struct device *dev, unsigned short reg, |
| 53 | unsigned short *data) |
| 54 | { |
| 55 | struct i2c_client *client = to_i2c_client(dev); |
| 56 | int ret = 0; |
| 57 | u8 *_reg = (u8 *)® |
| 58 | u8 *_data = (u8 *)data; |
| 59 | |
| 60 | u8 tx[2] = { |
| 61 | _reg[1], |
| 62 | _reg[0] |
| 63 | }; |
| 64 | u8 rx[2]; |
| 65 | |
| 66 | ret = i2c_master_send(client, tx, 2); |
| 67 | if (ret >= 0) |
| 68 | ret = i2c_master_recv(client, rx, 2); |
| 69 | |
| 70 | if (unlikely(ret < 0)) { |
| 71 | dev_err(&client->dev, "I2C read error\n"); |
| 72 | } else { |
| 73 | _data[0] = rx[1]; |
| 74 | _data[1] = rx[0]; |
| 75 | } |
| 76 | |
| 77 | return ret; |
| 78 | } |
| 79 | |
| 80 | static int __devinit ad714x_i2c_probe(struct i2c_client *client, |
| 81 | const struct i2c_device_id *id) |
| 82 | { |
| 83 | struct ad714x_chip *chip; |
| 84 | |
| 85 | chip = ad714x_probe(&client->dev, BUS_I2C, client->irq, |
| 86 | ad714x_i2c_read, ad714x_i2c_write); |
| 87 | if (IS_ERR(chip)) |
| 88 | return PTR_ERR(chip); |
| 89 | |
| 90 | i2c_set_clientdata(client, chip); |
| 91 | |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | static int __devexit ad714x_i2c_remove(struct i2c_client *client) |
| 96 | { |
| 97 | struct ad714x_chip *chip = i2c_get_clientdata(client); |
| 98 | |
| 99 | ad714x_remove(chip); |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | static const struct i2c_device_id ad714x_id[] = { |
| 105 | { "ad7142_captouch", 0 }, |
Barry Song | 6c04d7b | 2010-03-21 23:23:29 -0700 | [diff] [blame] | 106 | { "ad7143_captouch", 0 }, |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 107 | { "ad7147_captouch", 0 }, |
Barry Song | 6c04d7b | 2010-03-21 23:23:29 -0700 | [diff] [blame] | 108 | { "ad7147a_captouch", 0 }, |
| 109 | { "ad7148_captouch", 0 }, |
Bryan Wu | 31a6296 | 2010-03-21 23:23:24 -0700 | [diff] [blame] | 110 | { } |
| 111 | }; |
| 112 | MODULE_DEVICE_TABLE(i2c, ad714x_id); |
| 113 | |
| 114 | static struct i2c_driver ad714x_i2c_driver = { |
| 115 | .driver = { |
| 116 | .name = "ad714x_captouch", |
| 117 | }, |
| 118 | .probe = ad714x_i2c_probe, |
| 119 | .remove = __devexit_p(ad714x_i2c_remove), |
| 120 | .suspend = ad714x_i2c_suspend, |
| 121 | .resume = ad714x_i2c_resume, |
| 122 | .id_table = ad714x_id, |
| 123 | }; |
| 124 | |
| 125 | static __init int ad714x_i2c_init(void) |
| 126 | { |
| 127 | return i2c_add_driver(&ad714x_i2c_driver); |
| 128 | } |
| 129 | module_init(ad714x_i2c_init); |
| 130 | |
| 131 | static __exit void ad714x_i2c_exit(void) |
| 132 | { |
| 133 | i2c_del_driver(&ad714x_i2c_driver); |
| 134 | } |
| 135 | module_exit(ad714x_i2c_exit); |
| 136 | |
| 137 | MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver"); |
| 138 | MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); |
| 139 | MODULE_LICENSE("GPL"); |