diff options
Diffstat (limited to 'drivers/staging/iio/adc/ad7298.c')
-rw-r--r-- | drivers/staging/iio/adc/ad7298.c | 501 |
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); |