diff options
Diffstat (limited to 'drivers/staging/iio/addac/adt7316-i2c.c')
| -rw-r--r-- | drivers/staging/iio/addac/adt7316-i2c.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/drivers/staging/iio/addac/adt7316-i2c.c b/drivers/staging/iio/addac/adt7316-i2c.c new file mode 100644 index 000000000000..52d1ea349635 --- /dev/null +++ b/drivers/staging/iio/addac/adt7316-i2c.c @@ -0,0 +1,170 @@ +/* + * I2C bus driver for ADT7316/7/8 ADT7516/7/9 digital temperature + * sensor, ADC and DAC + * + * Copyright 2010 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> + +#include "adt7316.h" + +/* + * adt7316 register access by I2C + */ +static int adt7316_i2c_read(void *client, u8 reg, u8 *data) +{ + struct i2c_client *cl = client; + int ret = 0; + + ret = i2c_smbus_write_byte(cl, reg); + if (ret < 0) { + dev_err(&cl->dev, "I2C fail to select reg\n"); + return ret; + } + + ret = i2c_smbus_read_byte(client); + if (ret < 0) { + dev_err(&cl->dev, "I2C read error\n"); + return ret; + } + + return 0; +} + +static int adt7316_i2c_write(void *client, u8 reg, u8 data) +{ + struct i2c_client *cl = client; + int ret = 0; + + ret = i2c_smbus_write_byte_data(cl, reg, data); + if (ret < 0) + dev_err(&cl->dev, "I2C write error\n"); + + return ret; +} + +static int adt7316_i2c_multi_read(void *client, u8 reg, u8 count, u8 *data) +{ + struct i2c_client *cl = client; + int i, ret = 0; + + if (count > ADT7316_REG_MAX_ADDR) + count = ADT7316_REG_MAX_ADDR; + + for (i = 0; i < count; i++) { + ret = adt7316_i2c_read(cl, reg, &data[i]); + if (ret < 0) { + dev_err(&cl->dev, "I2C multi read error\n"); + return ret; + } + } + + return 0; +} + +static int adt7316_i2c_multi_write(void *client, u8 reg, u8 count, u8 *data) +{ + struct i2c_client *cl = client; + int i, ret = 0; + + if (count > ADT7316_REG_MAX_ADDR) + count = ADT7316_REG_MAX_ADDR; + + for (i = 0; i < count; i++) { + ret = adt7316_i2c_write(cl, reg, data[i]); + if (ret < 0) { + dev_err(&cl->dev, "I2C multi write error\n"); + return ret; + } + } + + return 0; +} + +/* + * device probe and remove + */ + +static int __devinit adt7316_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct adt7316_bus bus = { + .client = client, + .irq = client->irq, + .irq_flags = IRQF_TRIGGER_LOW, + .read = adt7316_i2c_read, + .write = adt7316_i2c_write, + .multi_read = adt7316_i2c_multi_read, + .multi_write = adt7316_i2c_multi_write, + }; + + return adt7316_probe(&client->dev, &bus, id->name); +} + +static int __devexit adt7316_i2c_remove(struct i2c_client *client) +{ + return adt7316_remove(&client->dev);; +} + +static const struct i2c_device_id adt7316_i2c_id[] = { + { "adt7316", 0 }, + { "adt7317", 0 }, + { "adt7318", 0 }, + { "adt7516", 0 }, + { "adt7517", 0 }, + { "adt7519", 0 }, + { } +}; + +MODULE_DEVICE_TABLE(i2c, adt7316_i2c_id); + +#ifdef CONFIG_PM +static int adt7316_i2c_suspend(struct i2c_client *client, pm_message_t message) +{ + return adt7316_disable(&client->dev); +} + +static int adt7316_i2c_resume(struct i2c_client *client) +{ + return adt7316_enable(&client->dev); +} +#else +# define adt7316_i2c_suspend NULL +# define adt7316_i2c_resume NULL +#endif + +static struct i2c_driver adt7316_driver = { + .driver = { + .name = "adt7316", + .owner = THIS_MODULE, + }, + .probe = adt7316_i2c_probe, + .remove = __devexit_p(adt7316_i2c_remove), + .suspend = adt7316_i2c_suspend, + .resume = adt7316_i2c_resume, + .id_table = adt7316_i2c_id, +}; + +static __init int adt7316_i2c_init(void) +{ + return i2c_add_driver(&adt7316_driver); +} + +static __exit void adt7316_i2c_exit(void) +{ + i2c_del_driver(&adt7316_driver); +} + +MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>"); +MODULE_DESCRIPTION("I2C bus driver for Analog Devices ADT7316/7/9 and" + "ADT7516/7/8 digital temperature sensor, ADC and DAC"); +MODULE_LICENSE("GPL v2"); + +module_init(adt7316_i2c_init); +module_exit(adt7316_i2c_exit); |