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 <linux/pm.h> 14 #include "ad714x.h" 15 16 #ifdef CONFIG_PM 17 static int ad714x_i2c_suspend(struct device *dev) 18 { 19 return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev))); 20 } 21 22 static int ad714x_i2c_resume(struct device *dev) 23 { 24 return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev))); 25 } 26 #endif 27 28 static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume); 29 30 static int ad714x_i2c_write(struct ad714x_chip *chip, 31 unsigned short reg, unsigned short data) 32 { 33 struct i2c_client *client = to_i2c_client(chip->dev); 34 int error; 35 36 chip->xfer_buf[0] = cpu_to_be16(reg); 37 chip->xfer_buf[1] = cpu_to_be16(data); 38 39 error = i2c_master_send(client, (u8 *)chip->xfer_buf, 40 2 * sizeof(*chip->xfer_buf)); 41 if (unlikely(error < 0)) { 42 dev_err(&client->dev, "I2C write error: %d\n", error); 43 return error; 44 } 45 46 return 0; 47 } 48 49 static int ad714x_i2c_read(struct ad714x_chip *chip, 50 unsigned short reg, unsigned short *data) 51 { 52 struct i2c_client *client = to_i2c_client(chip->dev); 53 int error; 54 55 chip->xfer_buf[0] = cpu_to_be16(reg); 56 57 error = i2c_master_send(client, (u8 *)chip->xfer_buf, 58 sizeof(*chip->xfer_buf)); 59 if (error >= 0) 60 error = i2c_master_recv(client, (u8 *)chip->xfer_buf, 61 sizeof(*chip->xfer_buf)); 62 63 if (unlikely(error < 0)) { 64 dev_err(&client->dev, "I2C read error: %d\n", error); 65 return error; 66 } 67 68 *data = be16_to_cpup(chip->xfer_buf); 69 return 0; 70 } 71 72 static int __devinit ad714x_i2c_probe(struct i2c_client *client, 73 const struct i2c_device_id *id) 74 { 75 struct ad714x_chip *chip; 76 77 chip = ad714x_probe(&client->dev, BUS_I2C, client->irq, 78 ad714x_i2c_read, ad714x_i2c_write); 79 if (IS_ERR(chip)) 80 return PTR_ERR(chip); 81 82 i2c_set_clientdata(client, chip); 83 84 return 0; 85 } 86 87 static int __devexit ad714x_i2c_remove(struct i2c_client *client) 88 { 89 struct ad714x_chip *chip = i2c_get_clientdata(client); 90 91 ad714x_remove(chip); 92 93 return 0; 94 } 95 96 static const struct i2c_device_id ad714x_id[] = { 97 { "ad7142_captouch", 0 }, 98 { "ad7143_captouch", 0 }, 99 { "ad7147_captouch", 0 }, 100 { "ad7147a_captouch", 0 }, 101 { "ad7148_captouch", 0 }, 102 { } 103 }; 104 MODULE_DEVICE_TABLE(i2c, ad714x_id); 105 106 static struct i2c_driver ad714x_i2c_driver = { 107 .driver = { 108 .name = "ad714x_captouch", 109 .pm = &ad714x_i2c_pm, 110 }, 111 .probe = ad714x_i2c_probe, 112 .remove = __devexit_p(ad714x_i2c_remove), 113 .id_table = ad714x_id, 114 }; 115 116 static __init int ad714x_i2c_init(void) 117 { 118 return i2c_add_driver(&ad714x_i2c_driver); 119 } 120 module_init(ad714x_i2c_init); 121 122 static __exit void ad714x_i2c_exit(void) 123 { 124 i2c_del_driver(&ad714x_i2c_driver); 125 } 126 module_exit(ad714x_i2c_exit); 127 128 MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver"); 129 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); 130 MODULE_LICENSE("GPL"); 131