1 /* 2 * AD714X CapTouch Programmable Controller driver (I2C bus) 3 * 4 * Copyright 2009-2011 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 static int __maybe_unused ad714x_i2c_suspend(struct device *dev) 17 { 18 return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev))); 19 } 20 21 static int __maybe_unused ad714x_i2c_resume(struct device *dev) 22 { 23 return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev))); 24 } 25 26 static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume); 27 28 static int ad714x_i2c_write(struct ad714x_chip *chip, 29 unsigned short reg, unsigned short data) 30 { 31 struct i2c_client *client = to_i2c_client(chip->dev); 32 int error; 33 34 chip->xfer_buf[0] = cpu_to_be16(reg); 35 chip->xfer_buf[1] = cpu_to_be16(data); 36 37 error = i2c_master_send(client, (u8 *)chip->xfer_buf, 38 2 * sizeof(*chip->xfer_buf)); 39 if (unlikely(error < 0)) { 40 dev_err(&client->dev, "I2C write error: %d\n", error); 41 return error; 42 } 43 44 return 0; 45 } 46 47 static int ad714x_i2c_read(struct ad714x_chip *chip, 48 unsigned short reg, unsigned short *data, size_t len) 49 { 50 struct i2c_client *client = to_i2c_client(chip->dev); 51 int i; 52 int error; 53 54 chip->xfer_buf[0] = cpu_to_be16(reg); 55 56 error = i2c_master_send(client, (u8 *)chip->xfer_buf, 57 sizeof(*chip->xfer_buf)); 58 if (error >= 0) 59 error = i2c_master_recv(client, (u8 *)chip->xfer_buf, 60 len * sizeof(*chip->xfer_buf)); 61 62 if (unlikely(error < 0)) { 63 dev_err(&client->dev, "I2C read error: %d\n", error); 64 return error; 65 } 66 67 for (i = 0; i < len; i++) 68 data[i] = be16_to_cpu(chip->xfer_buf[i]); 69 70 return 0; 71 } 72 73 static int ad714x_i2c_probe(struct i2c_client *client, 74 const struct i2c_device_id *id) 75 { 76 struct ad714x_chip *chip; 77 78 chip = ad714x_probe(&client->dev, BUS_I2C, client->irq, 79 ad714x_i2c_read, ad714x_i2c_write); 80 if (IS_ERR(chip)) 81 return PTR_ERR(chip); 82 83 i2c_set_clientdata(client, chip); 84 85 return 0; 86 } 87 88 static int ad714x_i2c_remove(struct i2c_client *client) 89 { 90 struct ad714x_chip *chip = i2c_get_clientdata(client); 91 92 ad714x_remove(chip); 93 94 return 0; 95 } 96 97 static const struct i2c_device_id ad714x_id[] = { 98 { "ad7142_captouch", 0 }, 99 { "ad7143_captouch", 0 }, 100 { "ad7147_captouch", 0 }, 101 { "ad7147a_captouch", 0 }, 102 { "ad7148_captouch", 0 }, 103 { } 104 }; 105 MODULE_DEVICE_TABLE(i2c, ad714x_id); 106 107 static struct i2c_driver ad714x_i2c_driver = { 108 .driver = { 109 .name = "ad714x_captouch", 110 .pm = &ad714x_i2c_pm, 111 }, 112 .probe = ad714x_i2c_probe, 113 .remove = ad714x_i2c_remove, 114 .id_table = ad714x_id, 115 }; 116 117 module_i2c_driver(ad714x_i2c_driver); 118 119 MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver"); 120 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); 121 MODULE_LICENSE("GPL"); 122