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path: root/drivers/staging/iio/adc/ad7298.c
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Diffstat (limited to 'drivers/staging/iio/adc/ad7298.c')
-rw-r--r--drivers/staging/iio/adc/ad7298.c501
1 files changed, 0 insertions, 501 deletions
diff --git a/drivers/staging/iio/adc/ad7298.c b/drivers/staging/iio/adc/ad7298.c
deleted file mode 100644
index 1a080c977637..000000000000
--- a/drivers/staging/iio/adc/ad7298.c
+++ /dev/null
@@ -1,501 +0,0 @@
-/*
- * AD7298 digital temperature sensor driver supporting AD7298
- *
- * Copyright 2010 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/interrupt.h>
-#include <linux/gpio.h>
-#include <linux/workqueue.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/list.h>
-#include <linux/spi/spi.h>
-#include <linux/rtc.h>
-
-#include "../iio.h"
-#include "../sysfs.h"
-
-/*
- * AD7298 command
- */
-#define AD7298_PD 0x1
-#define AD7298_T_AVG_MASK 0x2
-#define AD7298_EXT_REF 0x4
-#define AD7298_T_SENSE_MASK 0x20
-#define AD7298_VOLTAGE_MASK 0x3fc0
-#define AD7298_VOLTAGE_OFFSET 0x6
-#define AD7298_VOLTAGE_LIMIT_COUNT 8
-#define AD7298_REPEAT 0x40
-#define AD7298_WRITE 0x80
-
-/*
- * AD7298 value masks
- */
-#define AD7298_CHANNEL_MASK 0xf000
-#define AD7298_VALUE_MASK 0xfff
-#define AD7298_T_VALUE_SIGN 0x400
-#define AD7298_T_VALUE_FLOAT_OFFSET 2
-#define AD7298_T_VALUE_FLOAT_MASK 0x2
-
-/*
- * struct ad7298_chip_info - chip specifc information
- */
-
-struct ad7298_chip_info {
- const char *name;
- struct spi_device *spi_dev;
- struct iio_dev *indio_dev;
- u16 command;
- u16 busy_pin;
- u8 channels; /* Active voltage channels */
-};
-
-/*
- * ad7298 register access by SPI
- */
-static int ad7298_spi_write(struct ad7298_chip_info *chip, u16 data)
-{
- struct spi_device *spi_dev = chip->spi_dev;
- int ret = 0;
-
- data |= AD7298_WRITE;
- data = cpu_to_be16(data);
- ret = spi_write(spi_dev, (u8 *)&data, sizeof(data));
- if (ret < 0)
- dev_err(&spi_dev->dev, "SPI write error\n");
-
- return ret;
-}
-
-static int ad7298_spi_read(struct ad7298_chip_info *chip, u16 mask, u16 *data)
-{
- struct spi_device *spi_dev = chip->spi_dev;
- int ret = 0;
- u8 count = chip->channels;
- u16 command;
- int i;
-
- if (mask & AD7298_T_SENSE_MASK) {
- command = chip->command & ~(AD7298_T_AVG_MASK | AD7298_VOLTAGE_MASK);
- command |= AD7298_T_SENSE_MASK;
- count = 1;
- } else if (mask & AD7298_T_AVG_MASK) {
- command = chip->command & ~AD7298_VOLTAGE_MASK;
- command |= AD7298_T_SENSE_MASK | AD7298_T_AVG_MASK;
- count = 2;
- } else if (mask & AD7298_VOLTAGE_MASK) {
- command = chip->command & ~(AD7298_T_AVG_MASK | AD7298_T_SENSE_MASK);
- count = chip->channels;
- }
-
- ret = ad7298_spi_write(chip, chip->command);
- if (ret < 0) {
- dev_err(&spi_dev->dev, "SPI write command error\n");
- return ret;
- }
-
- ret = spi_read(spi_dev, (u8 *)&command, sizeof(command));
- if (ret < 0) {
- dev_err(&spi_dev->dev, "SPI read error\n");
- return ret;
- }
-
- i = 10000;
- while (i && gpio_get_value(chip->busy_pin)) {
- cpu_relax();
- i--;
- }
- if (!i) {
- dev_err(&spi_dev->dev, "Always in busy convertion.\n");
- return -EBUSY;
- }
-
- for (i = 0; i < count; i++) {
- ret = spi_read(spi_dev, (u8 *)&data[i], sizeof(data[i]));
- if (ret < 0) {
- dev_err(&spi_dev->dev, "SPI read error\n");
- return ret;
- }
- *data = be16_to_cpu(data[i]);
- }
-
- return 0;
-}
-
-static ssize_t ad7298_show_mode(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct ad7298_chip_info *chip = dev_info->dev_data;
-
- if (chip->command & AD7298_REPEAT)
- return sprintf(buf, "repeat\n");
- else
- return sprintf(buf, "normal\n");
-}
-
-static ssize_t ad7298_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 ad7298_chip_info *chip = dev_info->dev_data;
-
- if (strcmp(buf, "repeat"))
- chip->command |= AD7298_REPEAT;
- else
- chip->command &= (~AD7298_REPEAT);
-
- return 1;
-}
-
-static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
- ad7298_show_mode,
- ad7298_store_mode,
- 0);
-
-static ssize_t ad7298_show_available_modes(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "normal\nrepeat\n");
-}
-
-static IIO_DEVICE_ATTR(available_modes, S_IRUGO, ad7298_show_available_modes, NULL, 0);
-
-static ssize_t ad7298_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 ad7298_chip_info *chip = dev_info->dev_data;
- u16 command;
- int ret;
-
- command = chip->command & ~AD7298_PD;
-
- ret = ad7298_spi_write(chip, command);
- if (ret)
- return -EIO;
-
- command = chip->command | AD7298_PD;
-
- ret = ad7298_spi_write(chip, command);
- if (ret)
- return -EIO;
-
- return len;
-}
-
-static IIO_DEVICE_ATTR(reset, S_IWUSR,
- NULL,
- ad7298_store_reset,
- 0);
-
-static ssize_t ad7298_show_ext_ref(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct ad7298_chip_info *chip = dev_info->dev_data;
-
- return sprintf(buf, "%d\n", !!(chip->command & AD7298_EXT_REF));
-}
-
-static ssize_t ad7298_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 ad7298_chip_info *chip = dev_info->dev_data;
- u16 command;
- int ret;
-
- command = chip->command & (~AD7298_EXT_REF);
- if (strcmp(buf, "1"))
- command |= AD7298_EXT_REF;
-
- ret = ad7298_spi_write(chip, command);
- if (ret)
- return -EIO;
-
- chip->command = command;
-
- return len;
-}
-
-static IIO_DEVICE_ATTR(ext_ref, S_IRUGO | S_IWUSR,
- ad7298_show_ext_ref,
- ad7298_store_ext_ref,
- 0);
-
-static ssize_t ad7298_show_t_sense(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct ad7298_chip_info *chip = dev_info->dev_data;
- u16 data;
- char sign = ' ';
- int ret;
-
- ret = ad7298_spi_read(chip, AD7298_T_SENSE_MASK, &data);
- if (ret)
- return -EIO;
-
- if (data & AD7298_T_VALUE_SIGN) {
- /* convert supplement to positive value */
- data = (AD7298_T_VALUE_SIGN << 1) - data;
- sign = '-';
- }
-
- return sprintf(buf, "%c%d.%.2d\n", sign,
- (data >> AD7298_T_VALUE_FLOAT_OFFSET),
- (data & AD7298_T_VALUE_FLOAT_MASK) * 25);
-}
-
-static IIO_DEVICE_ATTR(t_sense, S_IRUGO, ad7298_show_t_sense, NULL, 0);
-
-static ssize_t ad7298_show_t_average(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct ad7298_chip_info *chip = dev_info->dev_data;
- u16 data[2];
- char sign = ' ';
- int ret;
-
- ret = ad7298_spi_read(chip, AD7298_T_AVG_MASK, data);
- if (ret)
- return -EIO;
-
- if (data[1] & AD7298_T_VALUE_SIGN) {
- /* convert supplement to positive value */
- data[1] = (AD7298_T_VALUE_SIGN << 1) - data[1];
- sign = '-';
- }
-
- return sprintf(buf, "%c%d.%.2d\n", sign,
- (data[1] >> AD7298_T_VALUE_FLOAT_OFFSET),
- (data[1] & AD7298_T_VALUE_FLOAT_MASK) * 25);
-}
-
-static IIO_DEVICE_ATTR(t_average, S_IRUGO, ad7298_show_t_average, NULL, 0);
-
-static ssize_t ad7298_show_voltage(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct ad7298_chip_info *chip = dev_info->dev_data;
- u16 data[AD7298_VOLTAGE_LIMIT_COUNT];
- int i, size, ret;
-
- ret = ad7298_spi_read(chip, AD7298_VOLTAGE_MASK, data);
- if (ret)
- return -EIO;
-
- for (i = 0; i < AD7298_VOLTAGE_LIMIT_COUNT; i++) {
- if (chip->command & (AD7298_T_SENSE_MASK << i)) {
- ret = sprintf(buf, "channel[%d]=%d\n", i,
- data[i] & AD7298_VALUE_MASK);
- if (ret < 0)
- break;
- buf += ret;
- size += ret;
- }
- }
-
- return size;
-}
-
-static IIO_DEVICE_ATTR(voltage, S_IRUGO, ad7298_show_voltage, NULL, 0);
-
-static ssize_t ad7298_show_channel_mask(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct ad7298_chip_info *chip = dev_info->dev_data;
-
- return sprintf(buf, "0x%x\n", (chip->command & AD7298_VOLTAGE_MASK) >>
- AD7298_VOLTAGE_OFFSET);
-}
-
-static ssize_t ad7298_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 ad7298_chip_info *chip = dev_info->dev_data;
- unsigned long data;
- int i, ret;
-
- ret = strict_strtoul(buf, 16, &data);
- if (ret || data > 0xff)
- return -EINVAL;
-
- chip->command &= (~AD7298_VOLTAGE_MASK);
- chip->command |= data << AD7298_VOLTAGE_OFFSET;
-
- for (i = 0, chip->channels = 0; i < AD7298_VOLTAGE_LIMIT_COUNT; i++) {
- if (chip->command & (AD7298_T_SENSE_MASK << i))
- chip->channels++;
- }
-
- return ret;
-}
-
-static IIO_DEVICE_ATTR(channel_mask, S_IRUGO | S_IWUSR,
- ad7298_show_channel_mask,
- ad7298_store_channel_mask,
- 0);
-
-static ssize_t ad7298_show_name(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct ad7298_chip_info *chip = dev_info->dev_data;
- return sprintf(buf, "%s\n", chip->name);
-}
-
-static IIO_DEVICE_ATTR(name, S_IRUGO, ad7298_show_name, NULL, 0);
-
-static struct attribute *ad7298_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_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 ad7298_attribute_group = {
- .attrs = ad7298_attributes,
-};
-
-/*
- * device probe and remove
- */
-static int __devinit ad7298_probe(struct spi_device *spi_dev)
-{
- struct ad7298_chip_info *chip;
- unsigned short *pins = spi_dev->dev.platform_data;
- int ret = 0;
-
- chip = kzalloc(sizeof(struct ad7298_chip_info), GFP_KERNEL);
-
- if (chip == NULL)
- return -ENOMEM;
-
- /* this is only used for device removal purposes */
- dev_set_drvdata(&spi_dev->dev, chip);
-
- chip->spi_dev = spi_dev;
- chip->name = spi_dev->modalias;
- chip->busy_pin = pins[0];
-
- ret = gpio_request(chip->busy_pin, chip->name);
- if (ret) {
- dev_err(&spi_dev->dev, "Fail to request busy gpio PIN %d.\n",
- chip->busy_pin);
- goto error_free_chip;
- }
- gpio_direction_input(chip->busy_pin);
-
- chip->indio_dev = iio_allocate_device();
- if (chip->indio_dev == NULL) {
- ret = -ENOMEM;
- goto error_free_gpio;
- }
-
- chip->indio_dev->dev.parent = &spi_dev->dev;
- chip->indio_dev->attrs = &ad7298_attribute_group;
- chip->indio_dev->dev_data = (void *)chip;
- chip->indio_dev->driver_module = THIS_MODULE;
- chip->indio_dev->modes = INDIO_DIRECT_MODE;
-
- ret = iio_device_register(chip->indio_dev);
- if (ret)
- goto error_free_dev;
-
- dev_info(&spi_dev->dev, "%s temperature sensor and ADC registered.\n",
- chip->name);
-
- return 0;
-
-error_free_dev:
- iio_free_device(chip->indio_dev);
-error_free_gpio:
- gpio_free(chip->busy_pin);
-error_free_chip:
- kfree(chip);
-
- return ret;
-}
-
-static int __devexit ad7298_remove(struct spi_device *spi_dev)
-{
- struct ad7298_chip_info *chip = dev_get_drvdata(&spi_dev->dev);
- struct iio_dev *indio_dev = chip->indio_dev;
-
- dev_set_drvdata(&spi_dev->dev, NULL);
- iio_device_unregister(indio_dev);
- iio_free_device(chip->indio_dev);
- gpio_free(chip->busy_pin);
- kfree(chip);
-
- return 0;
-}
-
-static const struct spi_device_id ad7298_id[] = {
- { "ad7298", 0 },
- {}
-};
-
-MODULE_DEVICE_TABLE(spi, ad7298_id);
-
-static struct spi_driver ad7298_driver = {
- .driver = {
- .name = "ad7298",
- .bus = &spi_bus_type,
- .owner = THIS_MODULE,
- },
- .probe = ad7298_probe,
- .remove = __devexit_p(ad7298_remove),
- .id_table = ad7298_id,
-};
-
-static __init int ad7298_init(void)
-{
- return spi_register_driver(&ad7298_driver);
-}
-
-static __exit void ad7298_exit(void)
-{
- spi_unregister_driver(&ad7298_driver);
-}
-
-MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
-MODULE_DESCRIPTION("Analog Devices AD7298 digital"
- " temperature sensor and ADC driver");
-MODULE_LICENSE("GPL v2");
-
-module_init(ad7298_init);
-module_exit(ad7298_exit);
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-26 00:00:28 +0000