/* * AD7291 digital temperature sensor driver supporting AD7291 * * 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" /* * AD7291 registers definition */ #define AD7291_COMMAND 0 #define AD7291_VOLTAGE 1 #define AD7291_T_SENSE 2 #define AD7291_T_AVERAGE 3 #define AD7291_VOLTAGE_LIMIT_BASE 4 #define AD7291_VOLTAGE_LIMIT_COUNT 8 #define AD7291_T_SENSE_HIGH 0x1c #define AD7291_T_SENSE_LOW 0x1d #define AD7291_T_SENSE_HYST 0x1e #define AD7291_VOLTAGE_ALERT_STATUS 0x1f #define AD7291_T_ALERT_STATUS 0x20 /* * AD7291 command */ #define AD7291_AUTOCYCLE 0x1 #define AD7291_RESET 0x2 #define AD7291_ALART_CLEAR 0x4 #define AD7291_ALART_POLARITY 0x8 #define AD7291_EXT_REF 0x10 #define AD7291_NOISE_DELAY 0x20 #define AD7291_T_SENSE_MASK 0x40 #define AD7291_VOLTAGE_MASK 0xff00 #define AD7291_VOLTAGE_OFFSET 0x8 /* * AD7291 value masks */ #define AD7291_CHANNEL_MASK 0xf000 #define AD7291_VALUE_MASK 0xfff #define AD7291_T_VALUE_SIGN 0x400 #define AD7291_T_VALUE_FLOAT_OFFSET 2 #define AD7291_T_VALUE_FLOAT_MASK 0x2 /* * struct ad7291_chip_info - chip specifc information */ struct ad7291_chip_info { const char *name; struct i2c_client *client; struct iio_dev *indio_dev; struct work_struct thresh_work; s64 last_timestamp; u16 command; u8 channels; /* Active voltage channels */ }; /* * struct ad7291_chip_info - chip specifc information */ struct ad7291_limit_regs { u16 data_high; u16 data_low; u16 hysteresis; }; /* * ad7291 register access by I2C */ static int ad7291_i2c_read(struct ad7291_chip_info *chip, u8 reg, u16 *data) { struct i2c_client *client = chip->client; int ret = 0; ret = i2c_smbus_read_word_data(client, reg); if (ret < 0) { dev_err(&client->dev, "I2C read error\n"); return ret; } *data = swab16((u16)ret); return 0; } static int ad7291_i2c_write(struct ad7291_chip_info *chip, u8 reg, u16 data) { struct i2c_client *client = chip->client; int ret = 0; ret = i2c_smbus_write_word_data(client, reg, swab16(data)); if (ret < 0) dev_err(&client->dev, "I2C write error\n"); return ret; } /* Returns negative errno, or else the number of words read. */ static int ad7291_i2c_read_data(struct ad7291_chip_info *chip, u8 reg, u16 *data) { struct i2c_client *client = chip->client; u8 commands[4]; int ret = 0; int i, count; if (reg == AD7291_T_SENSE || reg == AD7291_T_AVERAGE) count = 2; else if (reg == AD7291_VOLTAGE) { if (!chip->channels) { dev_err(&client->dev, "No voltage channel is selected.\n"); return -EINVAL; } count = 2 + chip->channels * 2; } else { dev_err(&client->dev, "I2C wrong data register\n"); return -EINVAL; } commands[0] = 0; commands[1] = (chip->command >> 8) & 0xff; commands[2] = chip->command & 0xff; commands[3] = reg; ret = i2c_master_send(client, commands, 4); if (ret < 0) { dev_err(&client->dev, "I2C master send error\n"); return ret; } ret = i2c_master_recv(client, (u8 *)data, count); if (ret < 0) { dev_err(&client->dev, "I2C master receive error\n"); return ret; } ret >>= 2; for (i = 0; i < ret; i++) data[i] = swab16(data[i]); return ret; } static ssize_t ad7291_show_mode(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; if (chip->command & AD7291_AUTOCYCLE) return sprintf(buf, "autocycle\n"); else return sprintf(buf, "command\n"); } static ssize_t ad7291_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 ad7291_chip_info *chip = dev_info->dev_data; u16 command; int ret; command = chip->command & (~AD7291_AUTOCYCLE); if (strcmp(buf, "autocycle")) command |= AD7291_AUTOCYCLE; ret = ad7291_i2c_write(chip, AD7291_COMMAND, command); if (ret) return -EIO; chip->command = command; return ret; } static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, ad7291_show_mode, ad7291_store_mode, 0); static ssize_t ad7291_show_available_modes(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "command\nautocycle\n"); } static IIO_DEVICE_ATTR(available_modes, S_IRUGO, ad7291_show_available_modes, NULL, 0); static ssize_t ad7291_store_reset(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; u16 command; int ret; command = chip->command | AD7291_RESET; ret = ad7291_i2c_write(chip, AD7291_COMMAND, command); if (ret) return -EIO; return ret; } static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, ad7291_store_reset, 0); static ssize_t ad7291_show_ext_ref(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; return sprintf(buf, "%d\n", !!(chip->command & AD7291_EXT_REF)); } static ssize_t ad7291_store_ext_ref(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; u16 command; int ret; command = chip->command & (~AD7291_EXT_REF); if (strcmp(buf, "1")) command |= AD7291_EXT_REF; ret = ad7291_i2c_write(chip, AD7291_COMMAND, command); if (ret) return -EIO; chip->command = command; return ret; } static IIO_DEVICE_ATTR(ext_ref, S_IRUGO | S_IWUSR, ad7291_show_ext_ref, ad7291_store_ext_ref, 0); static ssize_t ad7291_show_noise_delay(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; return sprintf(buf, "%d\n", !!(chip->command & AD7291_NOISE_DELAY)); } static ssize_t ad7291_store_noise_delay(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; u16 command; int ret; command = chip->command & (~AD7291_NOISE_DELAY); if (strcmp(buf, "1")) command |= AD7291_NOISE_DELAY; ret = ad7291_i2c_write(chip, AD7291_COMMAND, command); if (ret) return -EIO; chip->command = command; return ret; } static IIO_DEVICE_ATTR(noise_delay, S_IRUGO | S_IWUSR, ad7291_show_noise_delay, ad7291_store_noise_delay, 0); static ssize_t ad7291_show_t_sense(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; u16 data; char sign = ' '; int ret; ret = ad7291_i2c_read_data(chip, AD7291_T_SENSE, &data); if (ret) return -EIO; if (data & AD7291_T_VALUE_SIGN) { /* convert supplement to positive value */ data = (AD7291_T_VALUE_SIGN << 1) - data; sign = '-'; } return sprintf(buf, "%c%d.%.2d\n", sign, (data >> AD7291_T_VALUE_FLOAT_OFFSET), (data & AD7291_T_VALUE_FLOAT_MASK) * 25); } static IIO_DEVICE_ATTR(t_sense, S_IRUGO, ad7291_show_t_sense, NULL, 0); static ssize_t ad7291_show_t_average(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; u16 data; char sign = ' '; int ret; ret = ad7291_i2c_read_data(chip, AD7291_T_AVERAGE, &data); if (ret) return -EIO; if (data & AD7291_T_VALUE_SIGN) { /* convert supplement to positive value */ data = (AD7291_T_VALUE_SIGN << 1) - data; sign = '-'; } return sprintf(buf, "%c%d.%.2d\n", sign, (data >> AD7291_T_VALUE_FLOAT_OFFSET), (data & AD7291_T_VALUE_FLOAT_MASK) * 25); } static IIO_DEVICE_ATTR(t_average, S_IRUGO, ad7291_show_t_average, NULL, 0); static ssize_t ad7291_show_voltage(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; u16 data[AD7291_VOLTAGE_LIMIT_COUNT]; int i, size, ret; ret = ad7291_i2c_read_data(chip, AD7291_VOLTAGE, data); if (ret) return -EIO; for (i = 0; i < AD7291_VOLTAGE_LIMIT_COUNT; i++) { if (chip->command & (AD7291_T_SENSE_MASK << i)) { ret = sprintf(buf, "channel[%d]=%d\n", i, data[i] & AD7291_VALUE_MASK); if (ret < 0) break; buf += ret; size += ret; } } return size; } static IIO_DEVICE_ATTR(voltage, S_IRUGO, ad7291_show_voltage, NULL, 0); static ssize_t ad7291_show_channel_mask(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; return sprintf(buf, "0x%x\n", (chip->command & AD7291_VOLTAGE_MASK) >> AD7291_VOLTAGE_OFFSET); } static ssize_t ad7291_store_channel_mask(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; u16 command; unsigned long data; int i, ret; ret = strict_strtoul(buf, 16, &data); if (ret || data > 0xff) return -EINVAL; command = chip->command & (~AD7291_VOLTAGE_MASK); command |= data << AD7291_VOLTAGE_OFFSET; ret = ad7291_i2c_write(chip, AD7291_COMMAND, command); if (ret) return -EIO; chip->command = command; for (i = 0, chip->channels = 0; i < AD7291_VOLTAGE_LIMIT_COUNT; i++) { if (chip->command & (AD7291_T_SENSE_MASK << i)) chip->channels++; } return ret; } static IIO_DEVICE_ATTR(channel_mask, S_IRUGO | S_IWUSR, ad7291_show_channel_mask, ad7291_store_channel_mask, 0); static ssize_t ad7291_show_name(struct device *dev, struct device_attribute *attr, char *buf) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; return sprintf(buf, "%s\n", chip->name); } static IIO_DEVICE_ATTR(name, S_IRUGO, ad7291_show_name, NULL, 0); static struct attribute *ad7291_attributes[] = { &iio_dev_attr_available_modes.dev_attr.attr, &iio_dev_attr_mode.dev_attr.attr, &iio_dev_attr_reset.dev_attr.attr, &iio_dev_attr_ext_ref.dev_attr.attr, &iio_dev_attr_noise_delay.dev_attr.attr, &iio_dev_attr_t_sense.dev_attr.attr, &iio_dev_attr_t_average.dev_attr.attr, &iio_dev_attr_voltage.dev_attr.attr, &iio_dev_attr_channel_mask.dev_attr.attr, &iio_dev_attr_name.dev_attr.attr, NULL, }; static const struct attribute_group ad7291_attribute_group = { .attrs = ad7291_attributes, }; /* * temperature bound events */ #define IIO_EVENT_CODE_AD7291_T_SENSE_HIGH IIO_BUFFER_EVENT_CODE(0) #define IIO_EVENT_CODE_AD7291_T_SENSE_LOW IIO_BUFFER_EVENT_CODE(1) #define IIO_EVENT_CODE_AD7291_T_AVG_HIGH IIO_BUFFER_EVENT_CODE(2) #define IIO_EVENT_CODE_AD7291_T_AVG_LOW IIO_BUFFER_EVENT_CODE(3) #define IIO_EVENT_CODE_AD7291_VOLTAGE_BASE IIO_BUFFER_EVENT_CODE(4) static void ad7291_interrupt_bh(struct work_struct *work_s) { struct ad7291_chip_info *chip = container_of(work_s, struct ad7291_chip_info, thresh_work); u16 t_status, v_status; u16 command; int i; if (ad7291_i2c_read(chip, AD7291_T_ALERT_STATUS, &t_status)) return; if (ad7291_i2c_read(chip, AD7291_VOLTAGE_ALERT_STATUS, &v_status)) return; if (!(t_status || v_status)) return; command = chip->command | AD7291_ALART_CLEAR; ad7291_i2c_write(chip, AD7291_COMMAND, command); command = chip->command & ~AD7291_ALART_CLEAR; ad7291_i2c_write(chip, AD7291_COMMAND, command); enable_irq(chip->client->irq); for (i = 0; i < 4; i++) { if (t_status & (1 << i)) iio_push_event(chip->indio_dev, 0, IIO_EVENT_CODE_AD7291_T_SENSE_HIGH + i, chip->last_timestamp); } for (i = 0; i < AD7291_VOLTAGE_LIMIT_COUNT*2; i++) { if (v_status & (1 << i)) iio_push_event(chip->indio_dev, 0, IIO_EVENT_CODE_AD7291_VOLTAGE_BASE + i, chip->last_timestamp); } } static int ad7291_interrupt(struct iio_dev *dev_info, int index, s64 timestamp, int no_test) { struct ad7291_chip_info *chip = dev_info->dev_data; chip->last_timestamp = timestamp; schedule_work(&chip->thresh_work); return 0; } IIO_EVENT_SH(ad7291, &ad7291_interrupt); static inline ssize_t ad7291_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 ad7291_chip_info *chip = dev_info->dev_data; u16 data; char sign = ' '; int ret; ret = ad7291_i2c_read(chip, bound_reg, &data); if (ret) return -EIO; data &= AD7291_VALUE_MASK; if (data & AD7291_T_VALUE_SIGN) { /* convert supplement to positive value */ data = (AD7291_T_VALUE_SIGN << 1) - data; sign = '-'; } return sprintf(buf, "%c%d.%.2d\n", sign, data >> AD7291_T_VALUE_FLOAT_OFFSET, (data & AD7291_T_VALUE_FLOAT_MASK) * 25); } static inline ssize_t ad7291_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 ad7291_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 > AD7291_T_VALUE_FLOAT_OFFSET) len = AD7291_T_VALUE_FLOAT_OFFSET; pos[len] = 0; ret = strict_strtol(pos, 10, &tmp2); if (!ret) tmp2 = (tmp2 / 25) * 25; } if (tmp1 < 0) data = (u16)(-tmp1); else data = (u16)tmp1; data = (data << AD7291_T_VALUE_FLOAT_OFFSET) | (tmp2 & AD7291_T_VALUE_FLOAT_MASK); if (tmp1 < 0) /* convert positive value to supplyment */ data = (AD7291_T_VALUE_SIGN << 1) - data; ret = ad7291_i2c_write(chip, bound_reg, data); if (ret) return -EIO; return ret; } static ssize_t ad7291_show_t_sense_high(struct device *dev, struct device_attribute *attr, char *buf) { return ad7291_show_t_bound(dev, attr, AD7291_T_SENSE_HIGH, buf); } static inline ssize_t ad7291_set_t_sense_high(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { return ad7291_set_t_bound(dev, attr, AD7291_T_SENSE_HIGH, buf, len); } static ssize_t ad7291_show_t_sense_low(struct device *dev, struct device_attribute *attr, char *buf) { return ad7291_show_t_bound(dev, attr, AD7291_T_SENSE_LOW, buf); } static inline ssize_t ad7291_set_t_sense_low(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { return ad7291_set_t_bound(dev, attr, AD7291_T_SENSE_LOW, buf, len); } static ssize_t ad7291_show_t_sense_hyst(struct device *dev, struct device_attribute *attr, char *buf) { return ad7291_show_t_bound(dev, attr, AD7291_T_SENSE_HYST, buf); } static inline ssize_t ad7291_set_t_sense_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { return ad7291_set_t_bound(dev, attr, AD7291_T_SENSE_HYST, buf, len); } static inline ssize_t ad7291_show_v_bound(struct device *dev, struct device_attribute *attr, u8 bound_reg, char *buf) { struct iio_dev *dev_info = dev_get_drvdata(dev); struct ad7291_chip_info *chip = dev_info->dev_data; u16 data; int ret; if (bound_reg < AD7291_VOLTAGE_LIMIT_BASE || bound_reg >= AD7291_VOLTAGE_LIMIT_BASE + AD7291_VOLTAGE_LIMIT_COUNT) return -EINVAL; ret = ad7291_i2c_read(chip, bound_reg, &data); if (ret) return -EIO; data &= AD7291_VALUE_MASK; return sprintf(buf, "%d\n", data); } static inline ssize_t ad7291_set_v_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 ad7291_chip_info *chip = dev_info->dev_data; unsigned long value; u16 data; int ret; if (bound_reg < AD7291_VOLTAGE_LIMIT_BASE || bound_reg >= AD7291_VOLTAGE_LIMIT_BASE + AD7291_VOLTAGE_LIMIT_COUNT) return -EINVAL; ret = strict_strtoul(buf, 10, &value); if (ret || value >= 4096) return -EINVAL; data = (u16)value; ret = ad7291_i2c_write(chip, bound_reg, data); if (ret) return -EIO; return ret; } static int ad7291_get_voltage_limit_regs(const char *channel) { int index; if (strlen(channel) < 3 && channel[0] != 'v') return -EINVAL; index = channel[1] - '0'; if (index >= AD7291_VOLTAGE_LIMIT_COUNT) return -EINVAL; return index; } static ssize_t ad7291_show_voltage_high(struct device *dev, struct device_attribute *attr, char *buf) { int regs; regs = ad7291_get_voltage_limit_regs(attr->attr.name); if (regs < 0) return regs; return ad7291_show_t_bound(dev, attr, regs, buf); } static inline ssize_t ad7291_set_voltage_high(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { int regs; regs = ad7291_get_voltage_limit_regs(attr->attr.name); if (regs < 0) return regs; return ad7291_set_t_bound(dev, attr, regs, buf, len); } static ssize_t ad7291_show_voltage_low(struct device *dev, struct device_attribute *attr, char *buf) { int regs; regs = ad7291_get_voltage_limit_regs(attr->attr.name); if (regs < 0) return regs; return ad7291_show_t_bound(dev, attr, regs+1, buf); } static inline ssize_t ad7291_set_voltage_low(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { int regs; regs = ad7291_get_voltage_limit_regs(attr->attr.name); if (regs < 0) return regs; return ad7291_set_t_bound(dev, attr, regs+1, buf, len); } static ssize_t ad7291_show_voltage_hyst(struct device *dev, struct device_attribute *attr, char *buf) { int regs; regs = ad7291_get_voltage_limit_regs(attr->attr.name); if (regs < 0) return regs; return ad7291_show_t_bound(dev, attr, regs+2, buf); } static inline ssize_t ad7291_set_voltage_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { int regs; regs = ad7291_get_voltage_limit_regs(attr->attr.name); if (regs < 0) return regs; return ad7291_set_t_bound(dev, attr, regs+2, buf, len); } IIO_EVENT_ATTR_SH(t_sense_high, iio_event_ad7291, ad7291_show_t_sense_high, ad7291_set_t_sense_high, 0); IIO_EVENT_ATTR_SH(t_sense_low, iio_event_ad7291, ad7291_show_t_sense_low, ad7291_set_t_sense_low, 0); IIO_EVENT_ATTR_SH(t_sense_hyst, iio_event_ad7291, ad7291_show_t_sense_hyst, ad7291_set_t_sense_hyst, 0); IIO_EVENT_ATTR_SH(v0_high, iio_event_ad7291, ad7291_show_voltage_high, ad7291_set_voltage_high, 0); IIO_EVENT_ATTR_SH(v0_low, iio_event_ad7291, ad7291_show_voltage_low, ad7291_set_voltage_low, 0); IIO_EVENT_ATTR_SH(v0_hyst, iio_event_ad7291, ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); IIO_EVENT_ATTR_SH(v1_high, iio_event_ad7291, ad7291_show_voltage_high, ad7291_set_voltage_high, 0); IIO_EVENT_ATTR_SH(v1_low, iio_event_ad7291, ad7291_show_voltage_low, ad7291_set_voltage_low, 0); IIO_EVENT_ATTR_SH(v1_hyst, iio_event_ad7291, ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); IIO_EVENT_ATTR_SH(v2_high, iio_event_ad7291, ad7291_show_voltage_high, ad7291_set_voltage_high, 0); IIO_EVENT_ATTR_SH(v2_low, iio_event_ad7291, ad7291_show_voltage_low, ad7291_set_voltage_low, 0); IIO_EVENT_ATTR_SH(v2_hyst, iio_event_ad7291, ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); IIO_EVENT_ATTR_SH(v3_high, iio_event_ad7291, ad7291_show_voltage_high, ad7291_set_voltage_high, 0); IIO_EVENT_ATTR_SH(v3_low, iio_event_ad7291, ad7291_show_voltage_low, ad7291_set_voltage_low, 0); IIO_EVENT_ATTR_SH(v3_hyst, iio_event_ad7291, ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); IIO_EVENT_ATTR_SH(v4_high, iio_event_ad7291, ad7291_show_voltage_high, ad7291_set_voltage_high, 0); IIO_EVENT_ATTR_SH(v4_low, iio_event_ad7291, ad7291_show_voltage_low, ad7291_set_voltage_low, 0); IIO_EVENT_ATTR_SH(v4_hyst, iio_event_ad7291, ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); IIO_EVENT_ATTR_SH(v5_high, iio_event_ad7291, ad7291_show_voltage_high, ad7291_set_voltage_high, 0); IIO_EVENT_ATTR_SH(v5_low, iio_event_ad7291, ad7291_show_voltage_low, ad7291_set_voltage_low, 0); IIO_EVENT_ATTR_SH(v5_hyst, iio_event_ad7291, ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); IIO_EVENT_ATTR_SH(v6_high, iio_event_ad7291, ad7291_show_voltage_high, ad7291_set_voltage_high, 0); IIO_EVENT_ATTR_SH(v6_low, iio_event_ad7291, ad7291_show_voltage_low, ad7291_set_voltage_low, 0); IIO_EVENT_ATTR_SH(v6_hyst, iio_event_ad7291, ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); IIO_EVENT_ATTR_SH(v7_high, iio_event_ad7291, ad7291_show_voltage_high, ad7291_set_voltage_high, 0); IIO_EVENT_ATTR_SH(v7_low, iio_event_ad7291, ad7291_show_voltage_low, ad7291_set_voltage_low, 0); IIO_EVENT_ATTR_SH(v7_hyst, iio_event_ad7291, ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0); static struct attribute *ad7291_event_attributes[] = { &iio_event_attr_t_sense_high.dev_attr.attr, &iio_event_attr_t_sense_low.dev_attr.attr, &iio_event_attr_t_sense_hyst.dev_attr.attr, &iio_event_attr_v0_high.dev_attr.attr, &iio_event_attr_v0_low.dev_attr.attr, &iio_event_attr_v0_hyst.dev_attr.attr, &iio_event_attr_v1_high.dev_attr.attr, &iio_event_attr_v1_low.dev_attr.attr, &iio_event_attr_v1_hyst.dev_attr.attr, &iio_event_attr_v2_high.dev_attr.attr, &iio_event_attr_v2_low.dev_attr.attr, &iio_event_attr_v2_hyst.dev_attr.attr, &iio_event_attr_v3_high.dev_attr.attr, &iio_event_attr_v3_low.dev_attr.attr, &iio_event_attr_v3_hyst.dev_attr.attr, &iio_event_attr_v4_high.dev_attr.attr, &iio_event_attr_v4_low.dev_attr.attr, &iio_event_attr_v4_hyst.dev_attr.attr, &iio_event_attr_v5_high.dev_attr.attr, &iio_event_attr_v5_low.dev_attr.attr, &iio_event_attr_v5_hyst.dev_attr.attr, &iio_event_attr_v6_high.dev_attr.attr, &iio_event_attr_v6_low.dev_attr.attr, &iio_event_attr_v6_hyst.dev_attr.attr, &iio_event_attr_v7_high.dev_attr.attr, &iio_event_attr_v7_low.dev_attr.attr, &iio_event_attr_v7_hyst.dev_attr.attr, NULL, }; static struct attribute_group ad7291_event_attribute_group = { .attrs = ad7291_event_attributes, }; /* * device probe and remove */ static int __devinit ad7291_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct ad7291_chip_info *chip; int ret = 0; chip = kzalloc(sizeof(struct ad7291_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->command = AD7291_NOISE_DELAY | AD7291_T_SENSE_MASK; 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 = &ad7291_attribute_group; chip->indio_dev->event_attrs = &ad7291_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_ad7291. * All event attributes bind to the same event handler. * So, only register event handler once. */ iio_add_event_to_list(&iio_event_ad7291, &chip->indio_dev->interrupts[0]->ev_list); INIT_WORK(&chip->thresh_work, ad7291_interrupt_bh); /* set irq polarity low level */ chip->command |= AD7291_ALART_POLARITY; } ret = ad7291_i2c_write(chip, AD7291_COMMAND, chip->command); 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 ad7291_remove(struct i2c_client *client) { struct ad7291_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 ad7291_id[] = { { "ad7291", 0 }, {} }; MODULE_DEVICE_TABLE(i2c, ad7291_id); static struct i2c_driver ad7291_driver = { .driver = { .name = "ad7291", }, .probe = ad7291_probe, .remove = __devexit_p(ad7291_remove), .id_table = ad7291_id, }; static __init int ad7291_init(void) { return i2c_add_driver(&ad7291_driver); } static __exit void ad7291_exit(void) { i2c_del_driver(&ad7291_driver); } MODULE_AUTHOR("Sonic Zhang "); MODULE_DESCRIPTION("Analog Devices AD7291 digital" " temperature sensor driver"); MODULE_LICENSE("GPL v2"); module_init(ad7291_init); module_exit(ad7291_exit);