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 #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, size_t len) 51 { 52 struct i2c_client *client = to_i2c_client(chip->dev); 53 int i; 54 int error; 55 56 chip->xfer_buf[0] = cpu_to_be16(reg); 57 58 error = i2c_master_send(client, (u8 *)chip->xfer_buf, 59 sizeof(*chip->xfer_buf)); 60 if (error >= 0) 61 error = i2c_master_recv(client, (u8 *)chip->xfer_buf, 62 len * sizeof(*chip->xfer_buf)); 63 64 if (unlikely(error < 0)) { 65 dev_err(&client->dev, "I2C read error: %d\n", error); 66 return error; 67 } 68 69 for (i = 0; i < len; i++) 70 data[i] = be16_to_cpu(chip->xfer_buf[i]); 71 72 return 0; 73 } 74 75 static int __devinit ad714x_i2c_probe(struct i2c_client *client, 76 const struct i2c_device_id *id) 77 { 78 struct ad714x_chip *chip; 79 80 chip = ad714x_probe(&client->dev, BUS_I2C, client->irq, 81 ad714x_i2c_read, ad714x_i2c_write); 82 if (IS_ERR(chip)) 83 return PTR_ERR(chip); 84 85 i2c_set_clientdata(client, chip); 86 87 return 0; 88 } 89 90 static int __devexit ad714x_i2c_remove(struct i2c_client *client) 91 { 92 struct ad714x_chip *chip = i2c_get_clientdata(client); 93 94 ad714x_remove(chip); 95 96 return 0; 97 } 98 99 static const struct i2c_device_id ad714x_id[] = { 100 { "ad7142_captouch", 0 }, 101 { "ad7143_captouch", 0 }, 102 { "ad7147_captouch", 0 }, 103 { "ad7147a_captouch", 0 }, 104 { "ad7148_captouch", 0 }, 105 { } 106 }; 107 MODULE_DEVICE_TABLE(i2c, ad714x_id); 108 109 static struct i2c_driver ad714x_i2c_driver = { 110 .driver = { 111 .name = "ad714x_captouch", 112 .pm = &ad714x_i2c_pm, 113 }, 114 .probe = ad714x_i2c_probe, 115 .remove = __devexit_p(ad714x_i2c_remove), 116 .id_table = ad714x_id, 117 }; 118 119 static int __init ad714x_i2c_init(void) 120 { 121 return i2c_add_driver(&ad714x_i2c_driver); 122 } 123 module_init(ad714x_i2c_init); 124 125 static void __exit ad714x_i2c_exit(void) 126 { 127 i2c_del_driver(&ad714x_i2c_driver); 128 } 129 module_exit(ad714x_i2c_exit); 130 131 MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver"); 132 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); 133 MODULE_LICENSE("GPL"); 134