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 __maybe_unused ad714x_i2c_suspend(struct device *dev) 16 { 17 return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev))); 18 } 19 20 static int __maybe_unused ad714x_i2c_resume(struct device *dev) 21 { 22 return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev))); 23 } 24 25 static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume); 26 27 static int ad714x_i2c_write(struct ad714x_chip *chip, 28 unsigned short reg, unsigned short data) 29 { 30 struct i2c_client *client = to_i2c_client(chip->dev); 31 int error; 32 33 chip->xfer_buf[0] = cpu_to_be16(reg); 34 chip->xfer_buf[1] = cpu_to_be16(data); 35 36 error = i2c_master_send(client, (u8 *)chip->xfer_buf, 37 2 * sizeof(*chip->xfer_buf)); 38 if (unlikely(error < 0)) { 39 dev_err(&client->dev, "I2C write error: %d\n", error); 40 return error; 41 } 42 43 return 0; 44 } 45 46 static int ad714x_i2c_read(struct ad714x_chip *chip, 47 unsigned short reg, unsigned short *data, size_t len) 48 { 49 struct i2c_client *client = to_i2c_client(chip->dev); 50 int i; 51 int error; 52 53 chip->xfer_buf[0] = cpu_to_be16(reg); 54 55 error = i2c_master_send(client, (u8 *)chip->xfer_buf, 56 sizeof(*chip->xfer_buf)); 57 if (error >= 0) 58 error = i2c_master_recv(client, (u8 *)chip->xfer_buf, 59 len * sizeof(*chip->xfer_buf)); 60 61 if (unlikely(error < 0)) { 62 dev_err(&client->dev, "I2C read error: %d\n", error); 63 return error; 64 } 65 66 for (i = 0; i < len; i++) 67 data[i] = be16_to_cpu(chip->xfer_buf[i]); 68 69 return 0; 70 } 71 72 static int 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 const struct i2c_device_id ad714x_id[] = { 88 { "ad7142_captouch", 0 }, 89 { "ad7143_captouch", 0 }, 90 { "ad7147_captouch", 0 }, 91 { "ad7147a_captouch", 0 }, 92 { "ad7148_captouch", 0 }, 93 { } 94 }; 95 MODULE_DEVICE_TABLE(i2c, ad714x_id); 96 97 static struct i2c_driver ad714x_i2c_driver = { 98 .driver = { 99 .name = "ad714x_captouch", 100 .pm = &ad714x_i2c_pm, 101 }, 102 .probe = ad714x_i2c_probe, 103 .id_table = ad714x_id, 104 }; 105 106 module_i2c_driver(ad714x_i2c_driver); 107 108 MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver"); 109 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); 110 MODULE_LICENSE("GPL"); 111