1 /* 2 * I2C bus driver for ADT7316/7/8 ADT7516/7/9 digital temperature 3 * sensor, ADC and DAC 4 * 5 * Copyright 2010 Analog Devices Inc. 6 * 7 * Licensed under the GPL-2 or later. 8 */ 9 10 #include <linux/device.h> 11 #include <linux/kernel.h> 12 #include <linux/i2c.h> 13 #include <linux/interrupt.h> 14 #include <linux/module.h> 15 16 #include "adt7316.h" 17 18 /* 19 * adt7316 register access by I2C 20 */ 21 static int adt7316_i2c_read(void *client, u8 reg, u8 *data) 22 { 23 struct i2c_client *cl = client; 24 int ret; 25 26 ret = i2c_smbus_write_byte(cl, reg); 27 if (ret < 0) { 28 dev_err(&cl->dev, "I2C fail to select reg\n"); 29 return ret; 30 } 31 32 ret = i2c_smbus_read_byte(client); 33 if (ret < 0) { 34 dev_err(&cl->dev, "I2C read error\n"); 35 return ret; 36 } 37 38 return 0; 39 } 40 41 static int adt7316_i2c_write(void *client, u8 reg, u8 data) 42 { 43 struct i2c_client *cl = client; 44 int ret = 0; 45 46 ret = i2c_smbus_write_byte_data(cl, reg, data); 47 if (ret < 0) 48 dev_err(&cl->dev, "I2C write error\n"); 49 50 return ret; 51 } 52 53 static int adt7316_i2c_multi_read(void *client, u8 reg, u8 count, u8 *data) 54 { 55 struct i2c_client *cl = client; 56 int i, ret = 0; 57 58 if (count > ADT7316_REG_MAX_ADDR) 59 count = ADT7316_REG_MAX_ADDR; 60 61 for (i = 0; i < count; i++) { 62 ret = adt7316_i2c_read(cl, reg, &data[i]); 63 if (ret < 0) { 64 dev_err(&cl->dev, "I2C multi read error\n"); 65 return ret; 66 } 67 } 68 69 return 0; 70 } 71 72 static int adt7316_i2c_multi_write(void *client, u8 reg, u8 count, u8 *data) 73 { 74 struct i2c_client *cl = client; 75 int i, ret = 0; 76 77 if (count > ADT7316_REG_MAX_ADDR) 78 count = ADT7316_REG_MAX_ADDR; 79 80 for (i = 0; i < count; i++) { 81 ret = adt7316_i2c_write(cl, reg, data[i]); 82 if (ret < 0) { 83 dev_err(&cl->dev, "I2C multi write error\n"); 84 return ret; 85 } 86 } 87 88 return 0; 89 } 90 91 /* 92 * device probe and remove 93 */ 94 95 static int adt7316_i2c_probe(struct i2c_client *client, 96 const struct i2c_device_id *id) 97 { 98 struct adt7316_bus bus = { 99 .client = client, 100 .irq = client->irq, 101 .irq_flags = IRQF_TRIGGER_LOW, 102 .read = adt7316_i2c_read, 103 .write = adt7316_i2c_write, 104 .multi_read = adt7316_i2c_multi_read, 105 .multi_write = adt7316_i2c_multi_write, 106 }; 107 108 return adt7316_probe(&client->dev, &bus, id->name); 109 } 110 111 static const struct i2c_device_id adt7316_i2c_id[] = { 112 { "adt7316", 0 }, 113 { "adt7317", 0 }, 114 { "adt7318", 0 }, 115 { "adt7516", 0 }, 116 { "adt7517", 0 }, 117 { "adt7519", 0 }, 118 { } 119 }; 120 121 MODULE_DEVICE_TABLE(i2c, adt7316_i2c_id); 122 123 static struct i2c_driver adt7316_driver = { 124 .driver = { 125 .name = "adt7316", 126 .pm = ADT7316_PM_OPS, 127 }, 128 .probe = adt7316_i2c_probe, 129 .id_table = adt7316_i2c_id, 130 }; 131 module_i2c_driver(adt7316_driver); 132 133 MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>"); 134 MODULE_DESCRIPTION("I2C bus driver for Analog Devices ADT7316/7/9 and ADT7516/7/8 digital temperature sensor, ADC and DAC"); 135 MODULE_LICENSE("GPL v2"); 136