![Lars-Peter Clausen](/assets/img/avatar_default.png)
Replace open-coded instances of getting a iio_dev struct from a device struct with dev_to_iio_dev(). Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
717 lines
18 KiB
C
717 lines
18 KiB
C
/*
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* AD7291 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor
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*
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* Copyright 2010-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/interrupt.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/regulator/consumer.h>
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#include <linux/err.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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/*
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* Simplified handling
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*
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* If no events enabled - single polled channel read
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* If event enabled direct reads disable unless channel
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* is in the read mask.
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*
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* The noise-delayed bit as per datasheet suggestion is always enabled.
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*
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*/
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/*
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* AD7291 registers definition
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*/
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#define AD7291_COMMAND 0x00
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#define AD7291_VOLTAGE 0x01
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#define AD7291_T_SENSE 0x02
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#define AD7291_T_AVERAGE 0x03
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#define AD7291_CH0_DATA_HIGH 0x04
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#define AD7291_CH0_DATA_LOW 0x05
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#define AD7291_CH0_HYST 0x06
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#define AD7291_CH1_DATA_HIGH 0x07
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#define AD7291_CH1_DATA_LOW 0x08
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#define AD7291_CH1_HYST 0x09
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#define AD7291_CH2_DATA_HIGH 0x0A
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#define AD7291_CH2_DATA_LOW 0x0B
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#define AD7291_CH2_HYST 0x0C
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#define AD7291_CH3_DATA_HIGH 0x0D
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#define AD7291_CH3_DATA_LOW 0x0E
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#define AD7291_CH3_HYST 0x0F
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#define AD7291_CH4_DATA_HIGH 0x10
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#define AD7291_CH4_DATA_LOW 0x11
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#define AD7291_CH4_HYST 0x12
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#define AD7291_CH5_DATA_HIGH 0x13
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#define AD7291_CH5_DATA_LOW 0x14
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#define AD7291_CH5_HYST 0x15
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#define AD7291_CH6_DATA_HIGH 0x16
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#define AD7291_CH6_DATA_LOW 0x17
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#define AD7291_CH6_HYST 0x18
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#define AD7291_CH7_DATA_HIGH 0x19
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#define AD7291_CH7_DATA_LOW 0x1A
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#define AD7291_CH7_HYST 0x2B
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#define AD7291_T_SENSE_HIGH 0x1C
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#define AD7291_T_SENSE_LOW 0x1D
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#define AD7291_T_SENSE_HYST 0x1E
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#define AD7291_VOLTAGE_ALERT_STATUS 0x1F
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#define AD7291_T_ALERT_STATUS 0x20
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#define AD7291_VOLTAGE_LIMIT_COUNT 8
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/*
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* AD7291 command
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*/
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#define AD7291_AUTOCYCLE (1 << 0)
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#define AD7291_RESET (1 << 1)
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#define AD7291_ALERT_CLEAR (1 << 2)
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#define AD7291_ALERT_POLARITY (1 << 3)
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#define AD7291_EXT_REF (1 << 4)
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#define AD7291_NOISE_DELAY (1 << 5)
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#define AD7291_T_SENSE_MASK (1 << 7)
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#define AD7291_VOLTAGE_MASK 0xFF00
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#define AD7291_VOLTAGE_OFFSET 0x8
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/*
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* AD7291 value masks
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*/
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#define AD7291_CHANNEL_MASK 0xF000
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#define AD7291_BITS 12
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#define AD7291_VALUE_MASK 0xFFF
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#define AD7291_T_VALUE_SIGN 0x400
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#define AD7291_T_VALUE_FLOAT_OFFSET 2
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#define AD7291_T_VALUE_FLOAT_MASK 0x2
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#define AD7291_BITS 12
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struct ad7291_chip_info {
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struct i2c_client *client;
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struct regulator *reg;
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u16 int_vref_mv;
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u16 command;
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u16 c_mask; /* Active voltage channels for events */
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struct mutex state_lock;
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};
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static int ad7291_i2c_read(struct ad7291_chip_info *chip, u8 reg, u16 *data)
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{
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struct i2c_client *client = chip->client;
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int ret = 0;
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ret = i2c_smbus_read_word_data(client, reg);
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if (ret < 0) {
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dev_err(&client->dev, "I2C read error\n");
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return ret;
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}
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*data = swab16((u16)ret);
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return 0;
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}
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static int ad7291_i2c_write(struct ad7291_chip_info *chip, u8 reg, u16 data)
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{
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return i2c_smbus_write_word_data(chip->client, reg, swab16(data));
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}
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static ssize_t ad7291_store_reset(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct ad7291_chip_info *chip = iio_priv(indio_dev);
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return ad7291_i2c_write(chip, AD7291_COMMAND,
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chip->command | AD7291_RESET);
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}
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static IIO_DEVICE_ATTR(reset, S_IWUSR, NULL, ad7291_store_reset, 0);
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static struct attribute *ad7291_attributes[] = {
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&iio_dev_attr_reset.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group ad7291_attribute_group = {
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.attrs = ad7291_attributes,
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};
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static irqreturn_t ad7291_event_handler(int irq, void *private)
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{
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struct iio_dev *indio_dev = private;
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struct ad7291_chip_info *chip = iio_priv(private);
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u16 t_status, v_status;
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u16 command;
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int i;
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s64 timestamp = iio_get_time_ns();
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if (ad7291_i2c_read(chip, AD7291_T_ALERT_STATUS, &t_status))
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return IRQ_HANDLED;
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if (ad7291_i2c_read(chip, AD7291_VOLTAGE_ALERT_STATUS, &v_status))
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return IRQ_HANDLED;
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if (!(t_status || v_status))
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return IRQ_HANDLED;
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command = chip->command | AD7291_ALERT_CLEAR;
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ad7291_i2c_write(chip, AD7291_COMMAND, command);
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command = chip->command & ~AD7291_ALERT_CLEAR;
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ad7291_i2c_write(chip, AD7291_COMMAND, command);
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/* For now treat t_sense and t_sense_average the same */
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if ((t_status & (1 << 0)) || (t_status & (1 << 2)))
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iio_push_event(indio_dev,
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IIO_UNMOD_EVENT_CODE(IIO_TEMP,
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0,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_FALLING),
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timestamp);
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if ((t_status & (1 << 1)) || (t_status & (1 << 3)))
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iio_push_event(indio_dev,
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IIO_UNMOD_EVENT_CODE(IIO_TEMP,
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0,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_RISING),
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timestamp);
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for (i = 0; i < AD7291_VOLTAGE_LIMIT_COUNT*2; i += 2) {
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if (v_status & (1 << i))
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iio_push_event(indio_dev,
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IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
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i/2,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_FALLING),
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timestamp);
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if (v_status & (1 << (i + 1)))
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iio_push_event(indio_dev,
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IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
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i/2,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_RISING),
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timestamp);
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}
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return IRQ_HANDLED;
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}
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static inline ssize_t ad7291_show_hyst(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct ad7291_chip_info *chip = iio_priv(indio_dev);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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u16 data;
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int ret;
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ret = ad7291_i2c_read(chip, this_attr->address, &data);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", data & AD7291_VALUE_MASK);
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}
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static inline ssize_t ad7291_set_hyst(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct ad7291_chip_info *chip = iio_priv(indio_dev);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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u16 data;
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int ret;
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ret = kstrtou16(buf, 10, &data);
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if (ret < 0)
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return ret;
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if (data > AD7291_VALUE_MASK)
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return -EINVAL;
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ret = ad7291_i2c_write(chip, this_attr->address, data);
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if (ret < 0)
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return ret;
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return len;
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}
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static IIO_DEVICE_ATTR(in_temp0_thresh_both_hyst_raw,
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S_IRUGO | S_IWUSR,
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ad7291_show_hyst, ad7291_set_hyst,
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AD7291_T_SENSE_HYST);
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static IIO_DEVICE_ATTR(in_voltage0_thresh_both_hyst_raw,
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S_IRUGO | S_IWUSR,
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ad7291_show_hyst, ad7291_set_hyst, AD7291_CH0_HYST);
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static IIO_DEVICE_ATTR(in_voltage1_thresh_both_hyst_raw,
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S_IRUGO | S_IWUSR,
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ad7291_show_hyst, ad7291_set_hyst, AD7291_CH1_HYST);
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static IIO_DEVICE_ATTR(in_voltage2_thresh_both_hyst_raw,
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S_IRUGO | S_IWUSR,
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ad7291_show_hyst, ad7291_set_hyst, AD7291_CH2_HYST);
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static IIO_DEVICE_ATTR(in_voltage3_thresh_both_hyst_raw,
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S_IRUGO | S_IWUSR,
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ad7291_show_hyst, ad7291_set_hyst, AD7291_CH3_HYST);
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static IIO_DEVICE_ATTR(in_voltage4_thresh_both_hyst_raw,
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S_IRUGO | S_IWUSR,
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ad7291_show_hyst, ad7291_set_hyst, AD7291_CH4_HYST);
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static IIO_DEVICE_ATTR(in_voltage5_thresh_both_hyst_raw,
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S_IRUGO | S_IWUSR,
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ad7291_show_hyst, ad7291_set_hyst, AD7291_CH5_HYST);
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static IIO_DEVICE_ATTR(in_voltage6_thresh_both_hyst_raw,
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S_IRUGO | S_IWUSR,
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ad7291_show_hyst, ad7291_set_hyst, AD7291_CH6_HYST);
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static IIO_DEVICE_ATTR(in_voltage7_thresh_both_hyst_raw,
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S_IRUGO | S_IWUSR,
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ad7291_show_hyst, ad7291_set_hyst, AD7291_CH7_HYST);
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static struct attribute *ad7291_event_attributes[] = {
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&iio_dev_attr_in_temp0_thresh_both_hyst_raw.dev_attr.attr,
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&iio_dev_attr_in_voltage0_thresh_both_hyst_raw.dev_attr.attr,
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&iio_dev_attr_in_voltage1_thresh_both_hyst_raw.dev_attr.attr,
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&iio_dev_attr_in_voltage2_thresh_both_hyst_raw.dev_attr.attr,
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&iio_dev_attr_in_voltage3_thresh_both_hyst_raw.dev_attr.attr,
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&iio_dev_attr_in_voltage4_thresh_both_hyst_raw.dev_attr.attr,
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&iio_dev_attr_in_voltage5_thresh_both_hyst_raw.dev_attr.attr,
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&iio_dev_attr_in_voltage6_thresh_both_hyst_raw.dev_attr.attr,
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&iio_dev_attr_in_voltage7_thresh_both_hyst_raw.dev_attr.attr,
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NULL,
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};
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/* high / low */
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static u8 ad7291_limit_regs[9][2] = {
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{ AD7291_CH0_DATA_HIGH, AD7291_CH0_DATA_LOW },
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{ AD7291_CH1_DATA_HIGH, AD7291_CH1_DATA_LOW },
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{ AD7291_CH2_DATA_HIGH, AD7291_CH2_DATA_LOW },
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{ AD7291_CH3_DATA_HIGH, AD7291_CH3_DATA_LOW }, /* FIXME: ? */
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{ AD7291_CH4_DATA_HIGH, AD7291_CH4_DATA_LOW },
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{ AD7291_CH5_DATA_HIGH, AD7291_CH5_DATA_LOW },
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{ AD7291_CH6_DATA_HIGH, AD7291_CH6_DATA_LOW },
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{ AD7291_CH7_DATA_HIGH, AD7291_CH7_DATA_LOW },
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/* temp */
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{ AD7291_T_SENSE_HIGH, AD7291_T_SENSE_LOW },
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};
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static int ad7291_read_event_value(struct iio_dev *indio_dev,
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u64 event_code,
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int *val)
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{
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struct ad7291_chip_info *chip = iio_priv(indio_dev);
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int ret;
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u8 reg;
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u16 uval;
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s16 signval;
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switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) {
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case IIO_VOLTAGE:
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reg = ad7291_limit_regs[IIO_EVENT_CODE_EXTRACT_CHAN(event_code)]
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[!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
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IIO_EV_DIR_RISING)];
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ret = ad7291_i2c_read(chip, reg, &uval);
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if (ret < 0)
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return ret;
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*val = uval & AD7291_VALUE_MASK;
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return 0;
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case IIO_TEMP:
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reg = ad7291_limit_regs[8]
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[!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
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IIO_EV_DIR_RISING)];
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ret = ad7291_i2c_read(chip, reg, &signval);
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if (ret < 0)
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return ret;
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signval = (s16)((signval & AD7291_VALUE_MASK) << 4) >> 4;
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*val = signval;
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return 0;
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default:
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return -EINVAL;
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};
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}
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static int ad7291_write_event_value(struct iio_dev *indio_dev,
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u64 event_code,
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int val)
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{
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struct ad7291_chip_info *chip = iio_priv(indio_dev);
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u8 reg;
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s16 signval;
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switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) {
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case IIO_VOLTAGE:
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if (val > AD7291_VALUE_MASK || val < 0)
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return -EINVAL;
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reg = ad7291_limit_regs[IIO_EVENT_CODE_EXTRACT_CHAN(event_code)]
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[!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
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IIO_EV_DIR_RISING)];
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return ad7291_i2c_write(chip, reg, val);
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case IIO_TEMP:
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if (val > 2047 || val < -2048)
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return -EINVAL;
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reg = ad7291_limit_regs[8]
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[!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
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IIO_EV_DIR_RISING)];
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signval = val;
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return ad7291_i2c_write(chip, reg, *(u16 *)&signval);
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default:
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return -EINVAL;
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};
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}
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static int ad7291_read_event_config(struct iio_dev *indio_dev,
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u64 event_code)
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{
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struct ad7291_chip_info *chip = iio_priv(indio_dev);
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/* To be enabled the channel must simply be on. If any are enabled
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we are in continuous sampling mode */
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switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) {
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case IIO_VOLTAGE:
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if (chip->c_mask &
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(1 << (15 - IIO_EVENT_CODE_EXTRACT_CHAN(event_code))))
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return 1;
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else
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return 0;
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case IIO_TEMP:
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/* always on */
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return 1;
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default:
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return -EINVAL;
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}
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}
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static int ad7291_write_event_config(struct iio_dev *indio_dev,
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u64 event_code,
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int state)
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{
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int ret = 0;
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struct ad7291_chip_info *chip = iio_priv(indio_dev);
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u16 regval;
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mutex_lock(&chip->state_lock);
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regval = chip->command;
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/*
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* To be enabled the channel must simply be on. If any are enabled
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* use continuous sampling mode.
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* Possible to disable temp as well but that makes single read tricky.
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*/
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switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
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case IIO_VOLTAGE:
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if ((!state) && (chip->c_mask & (1 << (15 -
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IIO_EVENT_CODE_EXTRACT_CHAN(event_code)))))
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chip->c_mask &= ~(1 << (15 - IIO_EVENT_CODE_EXTRACT_CHAN
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(event_code)));
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else if (state && (!(chip->c_mask & (1 << (15 -
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IIO_EVENT_CODE_EXTRACT_CHAN(event_code))))))
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chip->c_mask |= (1 << (15 - IIO_EVENT_CODE_EXTRACT_CHAN
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(event_code)));
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else
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break;
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regval &= ~AD7291_AUTOCYCLE;
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regval |= chip->c_mask;
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if (chip->c_mask) /* Enable autocycle? */
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regval |= AD7291_AUTOCYCLE;
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ret = ad7291_i2c_write(chip, AD7291_COMMAND, regval);
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if (ret < 0)
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goto error_ret;
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chip->command = regval;
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break;
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default:
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ret = -EINVAL;
|
|
}
|
|
|
|
error_ret:
|
|
mutex_unlock(&chip->state_lock);
|
|
return ret;
|
|
}
|
|
|
|
static int ad7291_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val,
|
|
int *val2,
|
|
long mask)
|
|
{
|
|
int ret;
|
|
struct ad7291_chip_info *chip = iio_priv(indio_dev);
|
|
unsigned int scale_uv;
|
|
u16 regval;
|
|
s16 signval;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
switch (chan->type) {
|
|
case IIO_VOLTAGE:
|
|
mutex_lock(&chip->state_lock);
|
|
/* If in autocycle mode drop through */
|
|
if (chip->command & AD7291_AUTOCYCLE) {
|
|
mutex_unlock(&chip->state_lock);
|
|
return -EBUSY;
|
|
}
|
|
/* Enable this channel alone */
|
|
regval = chip->command & (~AD7291_VOLTAGE_MASK);
|
|
regval |= 1 << (15 - chan->channel);
|
|
ret = ad7291_i2c_write(chip, AD7291_COMMAND, regval);
|
|
if (ret < 0) {
|
|
mutex_unlock(&chip->state_lock);
|
|
return ret;
|
|
}
|
|
/* Read voltage */
|
|
ret = i2c_smbus_read_word_data(chip->client,
|
|
AD7291_VOLTAGE);
|
|
if (ret < 0) {
|
|
mutex_unlock(&chip->state_lock);
|
|
return ret;
|
|
}
|
|
*val = swab16((u16)ret) & AD7291_VALUE_MASK;
|
|
mutex_unlock(&chip->state_lock);
|
|
return IIO_VAL_INT;
|
|
case IIO_TEMP:
|
|
/* Assumes tsense bit of command register always set */
|
|
ret = i2c_smbus_read_word_data(chip->client,
|
|
AD7291_T_SENSE);
|
|
if (ret < 0)
|
|
return ret;
|
|
signval = (s16)((swab16((u16)ret) &
|
|
AD7291_VALUE_MASK) << 4) >> 4;
|
|
*val = signval;
|
|
return IIO_VAL_INT;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
case IIO_CHAN_INFO_AVERAGE_RAW:
|
|
ret = i2c_smbus_read_word_data(chip->client,
|
|
AD7291_T_AVERAGE);
|
|
if (ret < 0)
|
|
return ret;
|
|
signval = (s16)((swab16((u16)ret) &
|
|
AD7291_VALUE_MASK) << 4) >> 4;
|
|
*val = signval;
|
|
return IIO_VAL_INT;
|
|
case IIO_CHAN_INFO_SCALE:
|
|
switch (chan->type) {
|
|
case IIO_VOLTAGE:
|
|
scale_uv = (chip->int_vref_mv * 1000) >> AD7291_BITS;
|
|
*val = scale_uv / 1000;
|
|
*val2 = (scale_uv % 1000) * 1000;
|
|
return IIO_VAL_INT_PLUS_MICRO;
|
|
case IIO_TEMP:
|
|
/*
|
|
* One LSB of the ADC corresponds to 0.25 deg C.
|
|
* The temperature reading is in 12-bit twos
|
|
* complement format
|
|
*/
|
|
*val = 250;
|
|
return IIO_VAL_INT;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
#define AD7291_VOLTAGE_CHAN(_chan) \
|
|
{ \
|
|
.type = IIO_VOLTAGE, \
|
|
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
|
|
IIO_CHAN_INFO_SCALE_SHARED_BIT, \
|
|
.indexed = 1, \
|
|
.channel = _chan, \
|
|
.event_mask = IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING)|\
|
|
IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING) \
|
|
}
|
|
|
|
static const struct iio_chan_spec ad7291_channels[] = {
|
|
AD7291_VOLTAGE_CHAN(0),
|
|
AD7291_VOLTAGE_CHAN(1),
|
|
AD7291_VOLTAGE_CHAN(2),
|
|
AD7291_VOLTAGE_CHAN(3),
|
|
AD7291_VOLTAGE_CHAN(4),
|
|
AD7291_VOLTAGE_CHAN(5),
|
|
AD7291_VOLTAGE_CHAN(6),
|
|
AD7291_VOLTAGE_CHAN(7),
|
|
{
|
|
.type = IIO_TEMP,
|
|
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |
|
|
IIO_CHAN_INFO_AVERAGE_RAW_SEPARATE_BIT |
|
|
IIO_CHAN_INFO_SCALE_SEPARATE_BIT,
|
|
.indexed = 1,
|
|
.channel = 0,
|
|
.event_mask =
|
|
IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING)|
|
|
IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING)
|
|
}
|
|
};
|
|
|
|
static struct attribute_group ad7291_event_attribute_group = {
|
|
.attrs = ad7291_event_attributes,
|
|
};
|
|
|
|
static const struct iio_info ad7291_info = {
|
|
.attrs = &ad7291_attribute_group,
|
|
.read_raw = &ad7291_read_raw,
|
|
.read_event_config = &ad7291_read_event_config,
|
|
.write_event_config = &ad7291_write_event_config,
|
|
.read_event_value = &ad7291_read_event_value,
|
|
.write_event_value = &ad7291_write_event_value,
|
|
.event_attrs = &ad7291_event_attribute_group,
|
|
};
|
|
|
|
static int __devinit ad7291_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct ad7291_chip_info *chip;
|
|
struct iio_dev *indio_dev;
|
|
int ret = 0, voltage_uv = 0;
|
|
|
|
indio_dev = iio_device_alloc(sizeof(*chip));
|
|
if (indio_dev == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
chip = iio_priv(indio_dev);
|
|
|
|
chip->reg = regulator_get(&client->dev, "vcc");
|
|
if (!IS_ERR(chip->reg)) {
|
|
ret = regulator_enable(chip->reg);
|
|
if (ret)
|
|
goto error_put_reg;
|
|
voltage_uv = regulator_get_voltage(chip->reg);
|
|
}
|
|
|
|
mutex_init(&chip->state_lock);
|
|
/* this is only used for device removal purposes */
|
|
i2c_set_clientdata(client, indio_dev);
|
|
|
|
chip->client = client;
|
|
|
|
chip->command = AD7291_NOISE_DELAY |
|
|
AD7291_T_SENSE_MASK | /* Tsense always enabled */
|
|
AD7291_ALERT_POLARITY; /* set irq polarity low level */
|
|
|
|
if (voltage_uv) {
|
|
chip->int_vref_mv = voltage_uv / 1000;
|
|
chip->command |= AD7291_EXT_REF;
|
|
} else {
|
|
chip->int_vref_mv = 2500; /* Build-in ref */
|
|
}
|
|
|
|
indio_dev->name = id->name;
|
|
indio_dev->channels = ad7291_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(ad7291_channels);
|
|
|
|
indio_dev->dev.parent = &client->dev;
|
|
indio_dev->info = &ad7291_info;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
ret = ad7291_i2c_write(chip, AD7291_COMMAND, AD7291_RESET);
|
|
if (ret) {
|
|
ret = -EIO;
|
|
goto error_disable_reg;
|
|
}
|
|
|
|
ret = ad7291_i2c_write(chip, AD7291_COMMAND, chip->command);
|
|
if (ret) {
|
|
ret = -EIO;
|
|
goto error_disable_reg;
|
|
}
|
|
|
|
if (client->irq > 0) {
|
|
ret = request_threaded_irq(client->irq,
|
|
NULL,
|
|
&ad7291_event_handler,
|
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
|
|
id->name,
|
|
indio_dev);
|
|
if (ret)
|
|
goto error_disable_reg;
|
|
}
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret)
|
|
goto error_unreg_irq;
|
|
|
|
dev_info(&client->dev, "%s ADC registered.\n",
|
|
id->name);
|
|
|
|
return 0;
|
|
|
|
error_unreg_irq:
|
|
if (client->irq)
|
|
free_irq(client->irq, indio_dev);
|
|
error_disable_reg:
|
|
if (!IS_ERR(chip->reg))
|
|
regulator_disable(chip->reg);
|
|
error_put_reg:
|
|
if (!IS_ERR(chip->reg))
|
|
regulator_put(chip->reg);
|
|
|
|
iio_device_free(indio_dev);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit ad7291_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
struct ad7291_chip_info *chip = iio_priv(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
|
|
if (client->irq)
|
|
free_irq(client->irq, indio_dev);
|
|
|
|
if (!IS_ERR(chip->reg)) {
|
|
regulator_disable(chip->reg);
|
|
regulator_put(chip->reg);
|
|
}
|
|
|
|
iio_device_free(indio_dev);
|
|
|
|
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 = KBUILD_MODNAME,
|
|
},
|
|
.probe = ad7291_probe,
|
|
.remove = __devexit_p(ad7291_remove),
|
|
.id_table = ad7291_id,
|
|
};
|
|
module_i2c_driver(ad7291_driver);
|
|
|
|
MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
|
|
MODULE_DESCRIPTION("Analog Devices AD7291 ADC driver");
|
|
MODULE_LICENSE("GPL v2");
|