From: Sonic Zhang Date: Thu, 28 Oct 2010 01:44:00 +0000 (-0400) Subject: staging: iio: adc: new driver for ADT75 temperature sensors X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d7713b6c56472b41e04ebcbdfdf85df84c8e82d6;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git staging: iio: adc: new driver for ADT75 temperature sensors Signed-off-by: Sonic Zhang Signed-off-by: Michael Hennerich Acked-by: Jonathan Cameron Signed-off-by: Mike Frysinger Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index e722b26ee197..a7c6b818dbb7 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -113,3 +113,10 @@ config AD7816 help Say yes here to build support for Analog Devices AD7816/7/8 temperature sensors and ADC. + +config ADT75 + tristate "Analog Devices ADT75 temperature sensor driver" + depends on I2C + help + Say yes here to build support for Analog Devices ADT75 + temperature sensors. diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index b8d641cca1d2..d1f1b5720cdf 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -22,3 +22,4 @@ obj-$(CONFIG_AD7298) += ad7298.o obj-$(CONFIG_AD7314) += ad7314.o obj-$(CONFIG_AD7745) += ad7745.o obj-$(CONFIG_AD7816) += ad7816.o +obj-$(CONFIG_ADT75) += adt75.o diff --git a/drivers/staging/iio/adc/adt75.c b/drivers/staging/iio/adc/adt75.c new file mode 100644 index 000000000000..aff4d31eb89c --- /dev/null +++ b/drivers/staging/iio/adc/adt75.c @@ -0,0 +1,732 @@ +/* + * ADT75 digital temperature sensor driver supporting ADT75 + * + * Copyright 2010 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../iio.h" +#include "../sysfs.h" + +/* + * ADT75 registers definition + */ + +#define ADT75_TEMPERATURE 0 +#define ADT75_CONFIG 1 +#define ADT75_T_HYST 2 +#define ADT75_T_OS 3 +#define ADT75_ONESHOT 4 + +/* + * ADT75 config + */ +#define ADT75_PD 0x1 +#define ADT75_OS_INT 0x2 +#define ADT75_OS_POLARITY 0x4 +#define ADT75_FAULT_QUEUE_MASK 0x18 +#define ADT75_FAULT_QUEUE_OFFSET 3 +#define ADT75_SMBUS_ALART 0x8 + +/* + * ADT75 masks + */ +#define ADT75_VALUE_SIGN 0x800 +#define ADT75_VALUE_OFFSET 4 +#define ADT75_VALUE_FLOAT_OFFSET 4 +#define ADT75_VALUE_FLOAT_MASK 0xF + + +/* + * struct adt75_chip_info - chip specifc information + */ + +struct adt75_chip_info { + const char *name; + struct i2c_client *client; + struct iio_dev *indio_dev; + struct work_struct thresh_work; + s64 last_timestamp; + u8 config; +}; + +/* + * adt75 register access by I2C + */ + +static int adt75_i2c_read(struct adt75_chip_info *chip, u8 reg, u8 *data) +{ + struct i2c_client *client = chip->client; + int ret = 0, len; + + ret = i2c_smbus_write_byte(client, reg); + if (ret < 0) { + dev_err(&client->dev, "I2C read register address error\n"); + return ret; + } + + if (reg == ADT75_CONFIG || reg == ADT75_ONESHOT) + len = 1; + else + len = 2; + + ret = i2c_master_recv(client, data, len); + if (ret < 0) { + dev_err(&client->dev, "I2C read error\n"); + return ret; + } + + return ret; +} + +static int adt75_i2c_write(struct adt75_chip_info *chip, u8 reg, u8 data) +{ + struct i2c_client *client = chip->client; + int ret = 0; + + if (reg == ADT75_CONFIG || reg == ADT75_ONESHOT) + ret = i2c_smbus_write_byte_data(client, reg, data); + else + ret = i2c_smbus_write_word_data(client, reg, data); + + if (ret < 0) + dev_err(&client->dev, "I2C write error\n"); + + return ret; +} + +static ssize_t adt75_show_mode(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + + if (chip->config & ADT75_PD) + return sprintf(buf, "power-save\n"); + else + return sprintf(buf, "full\n"); +} + +static ssize_t adt75_store_mode(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + int ret; + u8 config; + + ret = adt75_i2c_read(chip, ADT75_CONFIG, &chip->config); + if (ret) + return -EIO; + + config = chip->config & ~ADT75_PD; + if (!strcmp(buf, "full")) + config |= ADT75_PD; + + ret = adt75_i2c_write(chip, ADT75_CONFIG, config); + if (ret) + return -EIO; + + chip->config = config; + + return ret; +} + +static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, + adt75_show_mode, + adt75_store_mode, + 0); + +static ssize_t adt75_show_available_modes(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "full\npower-down\n"); +} + +static IIO_DEVICE_ATTR(available_modes, S_IRUGO, adt75_show_available_modes, NULL, 0); + +static ssize_t adt75_show_oneshot(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + + return sprintf(buf, "%d\n", !!(chip->config & ADT75_ONESHOT)); +} + +static ssize_t adt75_store_oneshot(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + unsigned long data = 0; + int ret; + u8 config; + + ret = strict_strtoul(buf, 10, &data); + if (ret) + return -EINVAL; + + + ret = adt75_i2c_read(chip, ADT75_CONFIG, &chip->config); + if (ret) + return -EIO; + + config = chip->config & ~ADT75_ONESHOT; + if (data) + config |= ADT75_ONESHOT; + + ret = adt75_i2c_write(chip, ADT75_CONFIG, config); + if (ret) + return -EIO; + + chip->config = config; + + return ret; +} + +static IIO_DEVICE_ATTR(oneshot, S_IRUGO | S_IWUSR, + adt75_show_oneshot, + adt75_store_oneshot, + 0); + +static ssize_t adt75_show_value(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + u16 data; + char sign = ' '; + int ret; + + if (chip->config & ADT75_PD) { + dev_err(dev, "Can't read value in power-down mode.\n"); + return -EIO; + } + + if (chip->config & ADT75_ONESHOT) { + /* write to active converter */ + ret = i2c_smbus_write_byte(chip->client, ADT75_ONESHOT); + if (ret) + return -EIO; + } + + ret = adt75_i2c_read(chip, ADT75_TEMPERATURE, (u8 *)&data); + if (ret) + return -EIO; + + data = swab16(data) >> ADT75_VALUE_OFFSET; + if (data & ADT75_VALUE_SIGN) { + /* convert supplement to positive value */ + data = (ADT75_VALUE_SIGN << 1) - data; + sign = '-'; + } + + return sprintf(buf, "%c%d.%.4d\n", sign, + (data >> ADT75_VALUE_FLOAT_OFFSET), + (data & ADT75_VALUE_FLOAT_MASK) * 625); +} + +static IIO_DEVICE_ATTR(value, S_IRUGO, adt75_show_value, NULL, 0); + +static ssize_t adt75_show_name(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + return sprintf(buf, "%s\n", chip->name); +} + +static IIO_DEVICE_ATTR(name, S_IRUGO, adt75_show_name, NULL, 0); + +static struct attribute *adt75_attributes[] = { + &iio_dev_attr_available_modes.dev_attr.attr, + &iio_dev_attr_mode.dev_attr.attr, + &iio_dev_attr_oneshot.dev_attr.attr, + &iio_dev_attr_value.dev_attr.attr, + &iio_dev_attr_name.dev_attr.attr, + NULL, +}; + +static const struct attribute_group adt75_attribute_group = { + .attrs = adt75_attributes, +}; + +/* + * temperature bound events + */ + +#define IIO_EVENT_CODE_ADT75_OTI IIO_BUFFER_EVENT_CODE(0) + +static void adt75_interrupt_bh(struct work_struct *work_s) +{ + struct adt75_chip_info *chip = + container_of(work_s, struct adt75_chip_info, thresh_work); + + enable_irq(chip->client->irq); + + iio_push_event(chip->indio_dev, 0, + IIO_EVENT_CODE_ADT75_OTI, + chip->last_timestamp); +} + +static int adt75_interrupt(struct iio_dev *dev_info, + int index, + s64 timestamp, + int no_test) +{ + struct adt75_chip_info *chip = dev_info->dev_data; + + chip->last_timestamp = timestamp; + schedule_work(&chip->thresh_work); + + return 0; +} + +IIO_EVENT_SH(adt75, &adt75_interrupt); + +static ssize_t adt75_show_oti_mode(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + int ret; + + /* retrive ALART status */ + ret = adt75_i2c_read(chip, ADT75_CONFIG, &chip->config); + if (ret) + return -EIO; + + if (chip->config & ADT75_OS_INT) + return sprintf(buf, "interrupt\n"); + else + return sprintf(buf, "comparator\n"); +} + +static ssize_t adt75_set_oti_mode(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + int ret; + u8 config; + + /* retrive ALART status */ + ret = adt75_i2c_read(chip, ADT75_CONFIG, &chip->config); + if (ret) + return -EIO; + + config = chip->config & ~ADT75_OS_INT; + if (strcmp(buf, "comparator") != 0) + config |= ADT75_OS_INT; + + ret = adt75_i2c_write(chip, ADT75_CONFIG, config); + if (ret) + return -EIO; + + chip->config = config; + + return ret; +} + +static ssize_t adt75_show_available_oti_modes(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "comparator\ninterrupt\n"); +} + +static ssize_t adt75_show_smbus_alart(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + int ret; + + /* retrive ALART status */ + ret = adt75_i2c_read(chip, ADT75_CONFIG, &chip->config); + if (ret) + return -EIO; + + return sprintf(buf, "%d\n", !!(chip->config & ADT75_SMBUS_ALART)); +} + +static ssize_t adt75_set_smbus_alart(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + unsigned long data = 0; + int ret; + u8 config; + + ret = strict_strtoul(buf, 10, &data); + if (ret) + return -EINVAL; + + /* retrive ALART status */ + ret = adt75_i2c_read(chip, ADT75_CONFIG, &chip->config); + if (ret) + return -EIO; + + config = chip->config & ~ADT75_SMBUS_ALART; + if (data) + config |= ADT75_SMBUS_ALART; + + ret = adt75_i2c_write(chip, ADT75_CONFIG, config); + if (ret) + return -EIO; + + chip->config = config; + + return ret; +} + +static ssize_t adt75_show_fault_queue(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + int ret; + + /* retrive ALART status */ + ret = adt75_i2c_read(chip, ADT75_CONFIG, &chip->config); + if (ret) + return -EIO; + + return sprintf(buf, "%d\n", (chip->config & ADT75_FAULT_QUEUE_MASK) >> + ADT75_FAULT_QUEUE_OFFSET); +} + +static ssize_t adt75_set_fault_queue(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + unsigned long data; + int ret; + u8 config; + + ret = strict_strtoul(buf, 10, &data); + if (ret || data > 3) + return -EINVAL; + + /* retrive ALART status */ + ret = adt75_i2c_read(chip, ADT75_CONFIG, &chip->config); + if (ret) + return -EIO; + + config = chip->config & ~ADT75_FAULT_QUEUE_MASK; + config |= (data << ADT75_FAULT_QUEUE_OFFSET); + ret = adt75_i2c_write(chip, ADT75_CONFIG, config); + if (ret) + return -EIO; + + chip->config = config; + + return ret; +} +static inline ssize_t adt75_show_t_bound(struct device *dev, + struct device_attribute *attr, + u8 bound_reg, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + u16 data; + char sign = ' '; + int ret; + + ret = adt75_i2c_read(chip, bound_reg, (u8 *)&data); + if (ret) + return -EIO; + + data = swab16(data) >> ADT75_VALUE_OFFSET; + if (data & ADT75_VALUE_SIGN) { + /* convert supplement to positive value */ + data = (ADT75_VALUE_SIGN << 1) - data; + sign = '-'; + } + + return sprintf(buf, "%c%d.%.4d\n", sign, + (data >> ADT75_VALUE_FLOAT_OFFSET), + (data & ADT75_VALUE_FLOAT_MASK) * 625); +} + +static inline ssize_t adt75_set_t_bound(struct device *dev, + struct device_attribute *attr, + u8 bound_reg, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct adt75_chip_info *chip = dev_info->dev_data; + long tmp1, tmp2; + u16 data; + char *pos; + int ret; + + pos = strchr(buf, '.'); + + ret = strict_strtol(buf, 10, &tmp1); + + if (ret || tmp1 > 127 || tmp1 < -128) + return -EINVAL; + + if (pos) { + len = strlen(pos); + if (len > ADT75_VALUE_FLOAT_OFFSET) + len = ADT75_VALUE_FLOAT_OFFSET; + pos[len] = 0; + ret = strict_strtol(pos, 10, &tmp2); + + if (!ret) + tmp2 = (tmp2 / 625) * 625; + } + + if (tmp1 < 0) + data = (u16)(-tmp1); + else + data = (u16)tmp1; + data = (data << ADT75_VALUE_FLOAT_OFFSET) | (tmp2 & ADT75_VALUE_FLOAT_MASK); + if (tmp1 < 0) + /* convert positive value to supplyment */ + data = (ADT75_VALUE_SIGN << 1) - data; + data <<= ADT75_VALUE_OFFSET; + data = swab16(data); + + ret = adt75_i2c_write(chip, bound_reg, (u8)data); + if (ret) + return -EIO; + + return ret; +} + +static ssize_t adt75_show_t_os(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return adt75_show_t_bound(dev, attr, + ADT75_T_OS, buf); +} + +static inline ssize_t adt75_set_t_os(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + return adt75_set_t_bound(dev, attr, + ADT75_T_OS, buf, len); +} + +static ssize_t adt75_show_t_hyst(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return adt75_show_t_bound(dev, attr, + ADT75_T_HYST, buf); +} + +static inline ssize_t adt75_set_t_hyst(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + return adt75_set_t_bound(dev, attr, + ADT75_T_HYST, buf, len); +} + +IIO_EVENT_ATTR_SH(oti_mode, iio_event_adt75, + adt75_show_oti_mode, adt75_set_oti_mode, 0); +IIO_EVENT_ATTR_SH(available_oti_modes, iio_event_adt75, + adt75_show_available_oti_modes, NULL, 0); +IIO_EVENT_ATTR_SH(smbus_alart, iio_event_adt75, + adt75_show_smbus_alart, adt75_set_smbus_alart, 0); +IIO_EVENT_ATTR_SH(fault_queue, iio_event_adt75, + adt75_show_fault_queue, adt75_set_fault_queue, 0); +IIO_EVENT_ATTR_SH(t_os, iio_event_adt75, + adt75_show_t_os, adt75_set_t_os, 0); +IIO_EVENT_ATTR_SH(t_hyst, iio_event_adt75, + adt75_show_t_hyst, adt75_set_t_hyst, 0); + +static struct attribute *adt75_event_attributes[] = { + &iio_event_attr_oti_mode.dev_attr.attr, + &iio_event_attr_available_oti_modes.dev_attr.attr, + &iio_event_attr_smbus_alart.dev_attr.attr, + &iio_event_attr_fault_queue.dev_attr.attr, + &iio_event_attr_t_os.dev_attr.attr, + &iio_event_attr_t_hyst.dev_attr.attr, + NULL, +}; + +static struct attribute_group adt75_event_attribute_group = { + .attrs = adt75_event_attributes, +}; + +/* + * device probe and remove + */ + +static int __devinit adt75_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct adt75_chip_info *chip; + int ret = 0; + + chip = kzalloc(sizeof(struct adt75_chip_info), GFP_KERNEL); + + if (chip == NULL) + return -ENOMEM; + + /* this is only used for device removal purposes */ + i2c_set_clientdata(client, chip); + + chip->client = client; + chip->name = id->name; + + chip->indio_dev = iio_allocate_device(); + if (chip->indio_dev == NULL) { + ret = -ENOMEM; + goto error_free_chip; + } + + chip->indio_dev->dev.parent = &client->dev; + chip->indio_dev->attrs = &adt75_attribute_group; + chip->indio_dev->event_attrs = &adt75_event_attribute_group; + chip->indio_dev->dev_data = (void *)chip; + chip->indio_dev->driver_module = THIS_MODULE; + chip->indio_dev->num_interrupt_lines = 1; + chip->indio_dev->modes = INDIO_DIRECT_MODE; + + ret = iio_device_register(chip->indio_dev); + if (ret) + goto error_free_dev; + + if (client->irq > 0) { + ret = iio_register_interrupt_line(client->irq, + chip->indio_dev, + 0, + IRQF_TRIGGER_LOW, + chip->name); + if (ret) + goto error_unreg_dev; + + /* + * The event handler list element refer to iio_event_adt75. + * All event attributes bind to the same event handler. + * So, only register event handler once. + */ + iio_add_event_to_list(&iio_event_adt75, + &chip->indio_dev->interrupts[0]->ev_list); + + INIT_WORK(&chip->thresh_work, adt75_interrupt_bh); + + ret = adt75_i2c_read(chip, ADT75_CONFIG, &chip->config); + if (ret) { + ret = -EIO; + goto error_unreg_irq; + } + + /* set irq polarity low level */ + chip->config &= ~ADT75_OS_POLARITY; + + ret = adt75_i2c_write(chip, ADT75_CONFIG, chip->config); + if (ret) { + ret = -EIO; + goto error_unreg_irq; + } + } + + dev_info(&client->dev, "%s temperature sensor registered.\n", + id->name); + + return 0; +error_unreg_irq: + iio_unregister_interrupt_line(chip->indio_dev, 0); +error_unreg_dev: + iio_device_unregister(chip->indio_dev); +error_free_dev: + iio_free_device(chip->indio_dev); +error_free_chip: + kfree(chip); + + return ret; +} + +static int __devexit adt75_remove(struct i2c_client *client) +{ + struct adt75_chip_info *chip = i2c_get_clientdata(client); + struct iio_dev *indio_dev = chip->indio_dev; + + if (client->irq) + iio_unregister_interrupt_line(indio_dev, 0); + iio_device_unregister(indio_dev); + iio_free_device(chip->indio_dev); + kfree(chip); + + return 0; +} + +static const struct i2c_device_id adt75_id[] = { + { "adt75", 0 }, + {} +}; + +MODULE_DEVICE_TABLE(i2c, adt75_id); + +static struct i2c_driver adt75_driver = { + .driver = { + .name = "adt75", + }, + .probe = adt75_probe, + .remove = __devexit_p(adt75_remove), + .id_table = adt75_id, +}; + +static __init int adt75_init(void) +{ + return i2c_add_driver(&adt75_driver); +} + +static __exit void adt75_exit(void) +{ + i2c_del_driver(&adt75_driver); +} + +MODULE_AUTHOR("Sonic Zhang "); +MODULE_DESCRIPTION("Analog Devices ADT75 digital" + " temperature sensor driver"); +MODULE_LICENSE("GPL v2"); + +module_init(adt75_init); +module_exit(adt75_exit);