staging: iio: adc: new driver for AD7816 devices
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
parent
671d85f2aa
commit
7924425db0
@ -106,3 +106,10 @@ config AD7745
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To compile this driver as a module, choose M here: the
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module will be called ad7745.
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config AD7816
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tristate "Analog Devices AD7816/7/8 temperature sensor and ADC driver"
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depends on SPI
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help
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Say yes here to build support for Analog Devices AD7816/7/8
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temperature sensors and ADC.
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@ -21,3 +21,4 @@ obj-$(CONFIG_AD7291) += ad7291.o
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obj-$(CONFIG_AD7298) += ad7298.o
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obj-$(CONFIG_AD7314) += ad7314.o
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obj-$(CONFIG_AD7745) += ad7745.o
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obj-$(CONFIG_AD7816) += ad7816.o
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535
drivers/staging/iio/adc/ad7816.c
Normal file
535
drivers/staging/iio/adc/ad7816.c
Normal file
@ -0,0 +1,535 @@
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/*
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* AD7816 digital temperature sensor driver supporting AD7816/7/8
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*
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* Copyright 2010 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/gpio.h>
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#include <linux/workqueue.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/list.h>
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#include <linux/spi/spi.h>
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#include <linux/rtc.h>
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#include "../iio.h"
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#include "../sysfs.h"
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/*
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* AD7816 config masks
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*/
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#define AD7816_FULL 0x1
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#define AD7816_PD 0x2
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#define AD7816_CS_MASK 0x7
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#define AD7816_CS_MAX 0x4
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/*
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* AD7816 temperature masks
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*/
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#define AD7816_VALUE_OFFSET 6
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#define AD7816_BOUND_VALUE_BASE 0x8
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#define AD7816_BOUND_VALUE_MIN -95
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#define AD7816_BOUND_VALUE_MAX 152
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#define AD7816_TEMP_FLOAT_OFFSET 2
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#define AD7816_TEMP_FLOAT_MASK 0x3
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/*
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* struct ad7816_chip_info - chip specifc information
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*/
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struct ad7816_chip_info {
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const char *name;
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struct spi_device *spi_dev;
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struct iio_dev *indio_dev;
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struct work_struct thresh_work;
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s64 last_timestamp;
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u16 rdwr_pin;
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u16 convert_pin;
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u16 busy_pin;
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u8 oti_data[AD7816_CS_MAX+1];
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u8 channel_id; /* 0 always be temperature */
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u8 mode;
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};
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/*
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* ad7816 data access by SPI
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*/
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static int ad7816_spi_read(struct ad7816_chip_info *chip, u16 *data)
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{
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struct spi_device *spi_dev = chip->spi_dev;
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int ret = 0;
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gpio_set_value(chip->rdwr_pin, 1);
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gpio_set_value(chip->rdwr_pin, 0);
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ret = spi_write(spi_dev, &chip->channel_id, sizeof(chip->channel_id));
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if (ret < 0) {
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dev_err(&spi_dev->dev, "SPI channel setting error\n");
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return ret;
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}
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gpio_set_value(chip->rdwr_pin, 1);
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if (chip->mode == AD7816_PD) { /* operating mode 2 */
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gpio_set_value(chip->convert_pin, 1);
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gpio_set_value(chip->convert_pin, 0);
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} else { /* operating mode 1 */
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gpio_set_value(chip->convert_pin, 0);
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gpio_set_value(chip->convert_pin, 1);
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}
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while (gpio_get_value(chip->busy_pin))
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cpu_relax();
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gpio_set_value(chip->rdwr_pin, 0);
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gpio_set_value(chip->rdwr_pin, 1);
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ret = spi_read(spi_dev, (u8 *)data, sizeof(*data));
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if (ret < 0) {
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dev_err(&spi_dev->dev, "SPI data read error\n");
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return ret;
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}
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*data = be16_to_cpu(*data);
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return ret;
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}
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static int ad7816_spi_write(struct ad7816_chip_info *chip, u8 data)
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{
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struct spi_device *spi_dev = chip->spi_dev;
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int ret = 0;
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gpio_set_value(chip->rdwr_pin, 1);
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gpio_set_value(chip->rdwr_pin, 0);
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ret = spi_write(spi_dev, &data, sizeof(data));
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if (ret < 0)
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dev_err(&spi_dev->dev, "SPI oti data write error\n");
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return ret;
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}
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static ssize_t ad7816_show_mode(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 *dev_info = dev_get_drvdata(dev);
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struct ad7816_chip_info *chip = dev_info->dev_data;
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if (chip->mode)
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return sprintf(buf, "power-save\n");
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else
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return sprintf(buf, "full\n");
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}
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static ssize_t ad7816_store_mode(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 *dev_info = dev_get_drvdata(dev);
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struct ad7816_chip_info *chip = dev_info->dev_data;
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if (strcmp(buf, "full")) {
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gpio_set_value(chip->rdwr_pin, 1);
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chip->mode = AD7816_FULL;
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} else {
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gpio_set_value(chip->rdwr_pin, 0);
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chip->mode = AD7816_PD;
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}
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return len;
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}
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static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
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ad7816_show_mode,
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ad7816_store_mode,
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0);
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static ssize_t ad7816_show_available_modes(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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return sprintf(buf, "full\npower-save\n");
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}
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static IIO_DEVICE_ATTR(available_modes, S_IRUGO, ad7816_show_available_modes, NULL, 0);
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static ssize_t ad7816_show_channel(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 *dev_info = dev_get_drvdata(dev);
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struct ad7816_chip_info *chip = dev_info->dev_data;
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return sprintf(buf, "%d\n", chip->channel_id);
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}
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static ssize_t ad7816_store_channel(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 *dev_info = dev_get_drvdata(dev);
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struct ad7816_chip_info *chip = dev_info->dev_data;
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unsigned long data;
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int ret;
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ret = strict_strtoul(buf, 10, &data);
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if (ret)
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return -EINVAL;
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if (data > AD7816_CS_MAX && data != AD7816_CS_MASK) {
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dev_err(&chip->spi_dev->dev, "Invalid channel id %lu for %s.\n",
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data, chip->name);
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return -EINVAL;
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} else if (strcmp(chip->name, "ad7818") == 0 && data > 1) {
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dev_err(&chip->spi_dev->dev,
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"Invalid channel id %lu for ad7818.\n", data);
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return -EINVAL;
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} else if (strcmp(chip->name, "ad7816") == 0 && data > 0) {
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dev_err(&chip->spi_dev->dev,
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"Invalid channel id %lu for ad7816.\n", data);
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return -EINVAL;
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}
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chip->channel_id = data;
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return len;
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}
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static IIO_DEVICE_ATTR(channel, S_IRUGO | S_IWUSR,
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ad7816_show_channel,
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ad7816_store_channel,
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0);
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static ssize_t ad7816_show_value(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 *dev_info = dev_get_drvdata(dev);
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struct ad7816_chip_info *chip = dev_info->dev_data;
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u16 data;
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s8 value;
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int ret;
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ret = ad7816_spi_read(chip, &data);
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if (ret)
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return -EIO;
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data >>= AD7816_VALUE_OFFSET;
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if (chip->channel_id == 0) {
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value = (s8)((data >> AD7816_TEMP_FLOAT_OFFSET) - 103);
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data &= AD7816_TEMP_FLOAT_MASK;
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if (value < 0)
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data = (1 << AD7816_TEMP_FLOAT_OFFSET) - data;
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return sprintf(buf, "%d.%.2d\n", value, data * 25);
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} else
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return sprintf(buf, "%u\n", data);
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}
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static IIO_DEVICE_ATTR(value, S_IRUGO, ad7816_show_value, NULL, 0);
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static ssize_t ad7816_show_name(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 *dev_info = dev_get_drvdata(dev);
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struct ad7816_chip_info *chip = dev_info->dev_data;
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return sprintf(buf, "%s\n", chip->name);
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}
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static IIO_DEVICE_ATTR(name, S_IRUGO, ad7816_show_name, NULL, 0);
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static struct attribute *ad7816_attributes[] = {
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&iio_dev_attr_available_modes.dev_attr.attr,
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&iio_dev_attr_mode.dev_attr.attr,
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&iio_dev_attr_channel.dev_attr.attr,
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&iio_dev_attr_value.dev_attr.attr,
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&iio_dev_attr_name.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group ad7816_attribute_group = {
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.attrs = ad7816_attributes,
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};
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/*
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* temperature bound events
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*/
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#define IIO_EVENT_CODE_AD7816_OTI IIO_BUFFER_EVENT_CODE(0)
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static void ad7816_interrupt_bh(struct work_struct *work_s)
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{
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struct ad7816_chip_info *chip =
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container_of(work_s, struct ad7816_chip_info, thresh_work);
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enable_irq(chip->spi_dev->irq);
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iio_push_event(chip->indio_dev, 0,
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IIO_EVENT_CODE_AD7816_OTI,
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chip->last_timestamp);
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}
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static int ad7816_interrupt(struct iio_dev *dev_info,
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int index,
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s64 timestamp,
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int no_test)
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{
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struct ad7816_chip_info *chip = dev_info->dev_data;
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chip->last_timestamp = timestamp;
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schedule_work(&chip->thresh_work);
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return 0;
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}
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IIO_EVENT_SH(ad7816, &ad7816_interrupt);
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static ssize_t ad7816_show_oti(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 *dev_info = dev_get_drvdata(dev);
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struct ad7816_chip_info *chip = dev_info->dev_data;
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int value;
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if (chip->channel_id > AD7816_CS_MAX) {
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dev_err(dev, "Invalid oti channel id %d.\n", chip->channel_id);
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return -EINVAL;
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} else if (chip->channel_id == 0) {
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value = AD7816_BOUND_VALUE_MIN +
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(chip->oti_data[chip->channel_id] -
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AD7816_BOUND_VALUE_BASE);
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return sprintf(buf, "%d\n", value);
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} else
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return sprintf(buf, "%u\n", chip->oti_data[chip->channel_id]);
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}
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static inline ssize_t ad7816_set_oti(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 *dev_info = dev_get_drvdata(dev);
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struct ad7816_chip_info *chip = dev_info->dev_data;
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long value;
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u8 data;
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int ret;
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ret = strict_strtol(buf, 10, &value);
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if (chip->channel_id > AD7816_CS_MAX) {
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dev_err(dev, "Invalid oti channel id %d.\n", chip->channel_id);
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return -EINVAL;
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} else if (chip->channel_id == 0) {
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if (ret || value < AD7816_BOUND_VALUE_MIN ||
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value > AD7816_BOUND_VALUE_MAX)
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return -EINVAL;
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data = (u8)(value - AD7816_BOUND_VALUE_MIN +
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AD7816_BOUND_VALUE_BASE);
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} else {
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if (ret || value < AD7816_BOUND_VALUE_BASE || value > 255)
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return -EINVAL;
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data = (u8)value;
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}
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ret = ad7816_spi_write(chip, data);
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if (ret)
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return -EIO;
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chip->oti_data[chip->channel_id] = data;
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return len;
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}
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IIO_EVENT_ATTR_SH(oti, iio_event_ad7816,
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ad7816_show_oti, ad7816_set_oti, 0);
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static struct attribute *ad7816_event_attributes[] = {
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&iio_event_attr_oti.dev_attr.attr,
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NULL,
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};
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static struct attribute_group ad7816_event_attribute_group = {
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.attrs = ad7816_event_attributes,
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};
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/*
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* device probe and remove
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*/
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static int __devinit ad7816_probe(struct spi_device *spi_dev)
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{
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struct ad7816_chip_info *chip;
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unsigned short *pins = spi_dev->dev.platform_data;
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int ret = 0;
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int i;
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if (!pins) {
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dev_err(&spi_dev->dev, "No necessary GPIO platform data.\n");
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return -EINVAL;
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}
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chip = kzalloc(sizeof(struct ad7816_chip_info), GFP_KERNEL);
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if (chip == NULL)
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return -ENOMEM;
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/* this is only used for device removal purposes */
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dev_set_drvdata(&spi_dev->dev, chip);
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chip->spi_dev = spi_dev;
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chip->name = spi_dev->modalias;
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for (i = 0; i <= AD7816_CS_MAX; i++)
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chip->oti_data[i] = 203;
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chip->rdwr_pin = pins[0];
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chip->convert_pin = pins[1];
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chip->busy_pin = pins[2];
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ret = gpio_request(chip->rdwr_pin, chip->name);
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if (ret) {
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dev_err(&spi_dev->dev, "Fail to request rdwr gpio PIN %d.\n",
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chip->rdwr_pin);
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goto error_free_chip;
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}
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gpio_direction_input(chip->rdwr_pin);
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ret = gpio_request(chip->convert_pin, chip->name);
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if (ret) {
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dev_err(&spi_dev->dev, "Fail to request convert gpio PIN %d.\n",
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chip->convert_pin);
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goto error_free_gpio_rdwr;
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}
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gpio_direction_input(chip->convert_pin);
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ret = gpio_request(chip->busy_pin, chip->name);
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if (ret) {
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dev_err(&spi_dev->dev, "Fail to request busy gpio PIN %d.\n",
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chip->busy_pin);
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goto error_free_gpio_convert;
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}
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gpio_direction_input(chip->busy_pin);
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chip->indio_dev = iio_allocate_device();
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if (chip->indio_dev == NULL) {
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ret = -ENOMEM;
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goto error_free_gpio;
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}
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chip->indio_dev->dev.parent = &spi_dev->dev;
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chip->indio_dev->attrs = &ad7816_attribute_group;
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chip->indio_dev->event_attrs = &ad7816_event_attribute_group;
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chip->indio_dev->dev_data = (void *)chip;
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chip->indio_dev->driver_module = THIS_MODULE;
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chip->indio_dev->num_interrupt_lines = 1;
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chip->indio_dev->modes = INDIO_DIRECT_MODE;
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ret = iio_device_register(chip->indio_dev);
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if (ret)
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goto error_free_dev;
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if (spi_dev->irq) {
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/* Only low trigger is supported in ad7816/7/8 */
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ret = iio_register_interrupt_line(spi_dev->irq,
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chip->indio_dev,
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0,
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IRQF_TRIGGER_LOW,
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chip->name);
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if (ret)
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goto error_unreg_dev;
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/*
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* The event handler list element refer to iio_event_ad7816.
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* All event attributes bind to the same event handler.
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* So, only register event handler once.
|
||||
*/
|
||||
iio_add_event_to_list(&iio_event_ad7816,
|
||||
&chip->indio_dev->interrupts[0]->ev_list);
|
||||
|
||||
INIT_WORK(&chip->thresh_work, ad7816_interrupt_bh);
|
||||
}
|
||||
|
||||
dev_info(&spi_dev->dev, "%s temperature sensor and ADC registered.\n",
|
||||
chip->name);
|
||||
|
||||
return 0;
|
||||
|
||||
error_unreg_dev:
|
||||
iio_device_unregister(chip->indio_dev);
|
||||
error_free_dev:
|
||||
iio_free_device(chip->indio_dev);
|
||||
error_free_gpio:
|
||||
gpio_free(chip->busy_pin);
|
||||
error_free_gpio_convert:
|
||||
gpio_free(chip->convert_pin);
|
||||
error_free_gpio_rdwr:
|
||||
gpio_free(chip->rdwr_pin);
|
||||
error_free_chip:
|
||||
kfree(chip);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit ad7816_remove(struct spi_device *spi_dev)
|
||||
{
|
||||
struct ad7816_chip_info *chip = dev_get_drvdata(&spi_dev->dev);
|
||||
struct iio_dev *indio_dev = chip->indio_dev;
|
||||
|
||||
dev_set_drvdata(&spi_dev->dev, NULL);
|
||||
if (spi_dev->irq)
|
||||
iio_unregister_interrupt_line(indio_dev, 0);
|
||||
iio_device_unregister(indio_dev);
|
||||
iio_free_device(chip->indio_dev);
|
||||
gpio_free(chip->busy_pin);
|
||||
gpio_free(chip->convert_pin);
|
||||
gpio_free(chip->rdwr_pin);
|
||||
kfree(chip);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct spi_device_id ad7816_id[] = {
|
||||
{ "ad7816", 0 },
|
||||
{ "ad7817", 0 },
|
||||
{ "ad7818", 0 },
|
||||
{}
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(spi, ad7816_id);
|
||||
|
||||
static struct spi_driver ad7816_driver = {
|
||||
.driver = {
|
||||
.name = "ad7816",
|
||||
.bus = &spi_bus_type,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = ad7816_probe,
|
||||
.remove = __devexit_p(ad7816_remove),
|
||||
.id_table = ad7816_id,
|
||||
};
|
||||
|
||||
static __init int ad7816_init(void)
|
||||
{
|
||||
return spi_register_driver(&ad7816_driver);
|
||||
}
|
||||
|
||||
static __exit void ad7816_exit(void)
|
||||
{
|
||||
spi_unregister_driver(&ad7816_driver);
|
||||
}
|
||||
|
||||
MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
|
||||
MODULE_DESCRIPTION("Analog Devices AD7816/7/8 digital"
|
||||
" temperature sensor driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
||||
module_init(ad7816_init);
|
||||
module_exit(ad7816_exit);
|
Loading…
Reference in New Issue
Block a user