1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * AD714X CapTouch Programmable Controller driver (I2C bus) 4 * 5 * Copyright 2009-2011 Analog Devices Inc. 6 */ 7 8 #include <linux/input.h> /* BUS_I2C */ 9 #include <linux/i2c.h> 10 #include <linux/module.h> 11 #include <linux/types.h> 12 #include <linux/pm.h> 13 #include "ad714x.h" 14 15 static int ad714x_i2c_write(struct ad714x_chip *chip, 16 unsigned short reg, unsigned short data) 17 { 18 struct i2c_client *client = to_i2c_client(chip->dev); 19 int error; 20 21 chip->xfer_buf[0] = cpu_to_be16(reg); 22 chip->xfer_buf[1] = cpu_to_be16(data); 23 24 error = i2c_master_send(client, (u8 *)chip->xfer_buf, 25 2 * sizeof(*chip->xfer_buf)); 26 if (unlikely(error < 0)) { 27 dev_err(&client->dev, "I2C write error: %d\n", error); 28 return error; 29 } 30 31 return 0; 32 } 33 34 static int ad714x_i2c_read(struct ad714x_chip *chip, 35 unsigned short reg, unsigned short *data, size_t len) 36 { 37 struct i2c_client *client = to_i2c_client(chip->dev); 38 int i; 39 int error; 40 41 chip->xfer_buf[0] = cpu_to_be16(reg); 42 43 error = i2c_master_send(client, (u8 *)chip->xfer_buf, 44 sizeof(*chip->xfer_buf)); 45 if (error >= 0) 46 error = i2c_master_recv(client, (u8 *)chip->xfer_buf, 47 len * sizeof(*chip->xfer_buf)); 48 49 if (unlikely(error < 0)) { 50 dev_err(&client->dev, "I2C read error: %d\n", error); 51 return error; 52 } 53 54 for (i = 0; i < len; i++) 55 data[i] = be16_to_cpu(chip->xfer_buf[i]); 56 57 return 0; 58 } 59 60 static int ad714x_i2c_probe(struct i2c_client *client) 61 { 62 struct ad714x_chip *chip; 63 64 chip = ad714x_probe(&client->dev, BUS_I2C, client->irq, 65 ad714x_i2c_read, ad714x_i2c_write); 66 if (IS_ERR(chip)) 67 return PTR_ERR(chip); 68 69 i2c_set_clientdata(client, chip); 70 71 return 0; 72 } 73 74 static const struct i2c_device_id ad714x_id[] = { 75 { "ad7142_captouch" }, 76 { "ad7143_captouch" }, 77 { "ad7147_captouch" }, 78 { "ad7147a_captouch" }, 79 { "ad7148_captouch" }, 80 { } 81 }; 82 MODULE_DEVICE_TABLE(i2c, ad714x_id); 83 84 static struct i2c_driver ad714x_i2c_driver = { 85 .driver = { 86 .name = "ad714x_captouch", 87 .pm = pm_sleep_ptr(&ad714x_pm), 88 }, 89 .probe = ad714x_i2c_probe, 90 .id_table = ad714x_id, 91 }; 92 93 module_i2c_driver(ad714x_i2c_driver); 94 95 MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver"); 96 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); 97 MODULE_LICENSE("GPL"); 98