diff options
| -rw-r--r-- | drivers/staging/iio/Documentation/sysfs-bus-iio | 6 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/Makefile | 5 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7298.c | 501 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7298.h | 80 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7298_core.c | 287 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7298_ring.c | 258 |
7 files changed, 640 insertions, 504 deletions
diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio b/drivers/staging/iio/Documentation/sysfs-bus-iio index da25bc73983a..8058fcbb87d7 100644 --- a/drivers/staging/iio/Documentation/sysfs-bus-iio +++ b/drivers/staging/iio/Documentation/sysfs-bus-iio @@ -111,6 +111,12 @@ Description: sensor is associated with one part of a compound device (e.g. a gyroscope axis). +What: /sys/bus/iio/devices/deviceX/tempX_input +KernelVersion: 2.6.38 +Contact: linux-iio@vger.kernel.org +Description: + Scaled temperature measurement in milli degrees Celsius. + What: /sys/bus/iio/devices/deviceX/accel_x_raw What: /sys/bus/iio/devices/deviceX/accel_y_raw What: /sys/bus/iio/devices/deviceX/accel_z_raw diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index 5613b30bc663..6692a3d87f23 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -49,11 +49,14 @@ config AD7291 temperature sensors. config AD7298 - tristate "Analog Devices AD7298 temperature sensor and ADC driver" + tristate "Analog Devices AD7298 ADC driver" depends on SPI help Say yes here to build support for Analog Devices AD7298 - temperature sensors and ADC. + 8 Channel ADC with temperature sensor. + + To compile this driver as a module, choose M here: the + module will be called ad7298. config AD7314 tristate "Analog Devices AD7314 temperature sensor driver" diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index cb73346d6d9e..31067defd79b 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -25,10 +25,13 @@ ad7887-y := ad7887_core.o ad7887-$(CONFIG_IIO_RING_BUFFER) += ad7887_ring.o obj-$(CONFIG_AD7887) += ad7887.o +ad7298-y := ad7298_core.o +ad7298-$(CONFIG_IIO_RING_BUFFER) += ad7298_ring.o +obj-$(CONFIG_AD7298) += ad7298.o + obj-$(CONFIG_AD7150) += ad7150.o obj-$(CONFIG_AD7152) += ad7152.o obj-$(CONFIG_AD7291) += ad7291.o -obj-$(CONFIG_AD7298) += ad7298.o obj-$(CONFIG_AD7314) += ad7314.o obj-$(CONFIG_AD7745) += ad7745.o obj-$(CONFIG_AD7816) += ad7816.o 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); diff --git a/drivers/staging/iio/adc/ad7298.h b/drivers/staging/iio/adc/ad7298.h new file mode 100644 index 000000000000..fe7ed77d638f --- /dev/null +++ b/drivers/staging/iio/adc/ad7298.h @@ -0,0 +1,80 @@ +/* + * AD7298 SPI ADC driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#ifndef IIO_ADC_AD7298_H_ +#define IIO_ADC_AD7298_H_ + +#define AD7298_WRITE (1 << 15) /* write to the control register */ +#define AD7298_REPEAT (1 << 14) /* repeated conversion enable */ +#define AD7298_CH(x) (1 << (13 - (x))) /* channel select */ +#define AD7298_TSENSE (1 << 5) /* temperature conversion enable */ +#define AD7298_EXTREF (1 << 2) /* external reference enable */ +#define AD7298_TAVG (1 << 1) /* temperature sensor averaging enable */ +#define AD7298_PDD (1 << 0) /* partial power down enable */ + +#define AD7298_CH_MASK (AD7298_CH0 | AD7298_CH1 | AD7298_CH2 | AD7298_CH3 | \ + AD7298_CH4 | AD7298_CH5 | AD7298_CH6 | AD7298_CH7) + +#define AD7298_MAX_CHAN 8 +#define AD7298_BITS 12 +#define AD7298_STORAGE_BITS 16 +#define AD7298_INTREF_mV 2500 + +#define RES_MASK(bits) ((1 << (bits)) - 1) + +/* + * TODO: struct ad7298_platform_data needs to go into include/linux/iio + */ + +struct ad7298_platform_data { + /* External Vref voltage applied */ + u16 vref_mv; +}; + +struct ad7298_state { + struct iio_dev *indio_dev; + struct spi_device *spi; + struct regulator *reg; + struct work_struct poll_work; + atomic_t protect_ring; + size_t d_size; + u16 int_vref_mv; + unsigned ext_ref; + struct spi_transfer ring_xfer[10]; + struct spi_transfer scan_single_xfer[3]; + struct spi_message ring_msg; + struct spi_message scan_single_msg; + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + unsigned short rx_buf[8] ____cacheline_aligned; + unsigned short tx_buf[2]; +}; + +#ifdef CONFIG_IIO_RING_BUFFER +int ad7298_scan_from_ring(struct ad7298_state *st, long ch); +int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev); +void ad7298_ring_cleanup(struct iio_dev *indio_dev); +#else /* CONFIG_IIO_RING_BUFFER */ +static inline int ad7298_scan_from_ring(struct ad7298_state *st, long ch) +{ + return 0; +} + +static inline int +ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev) +{ + return 0; +} + +static inline void ad7298_ring_cleanup(struct iio_dev *indio_dev) +{ +} +#endif /* CONFIG_IIO_RING_BUFFER */ +#endif /* IIO_ADC_AD7298_H_ */ diff --git a/drivers/staging/iio/adc/ad7298_core.c b/drivers/staging/iio/adc/ad7298_core.c new file mode 100644 index 000000000000..2e9154e7d887 --- /dev/null +++ b/drivers/staging/iio/adc/ad7298_core.c @@ -0,0 +1,287 @@ +/* + * AD7298 SPI ADC driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#include <linux/workqueue.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/spi/spi.h> +#include <linux/regulator/consumer.h> +#include <linux/err.h> +#include <linux/delay.h> + +#include "../iio.h" +#include "../sysfs.h" +#include "../ring_generic.h" +#include "adc.h" + +#include "ad7298.h" + +static int ad7298_scan_direct(struct ad7298_state *st, unsigned ch) +{ + int ret; + st->tx_buf[0] = cpu_to_be16(AD7298_WRITE | st->ext_ref | + (AD7298_CH(0) >> ch)); + + ret = spi_sync(st->spi, &st->scan_single_msg); + if (ret) + return ret; + + return be16_to_cpu(st->rx_buf[0]); +} + +static ssize_t ad7298_scan(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7298_state *st = dev_info->dev_data; + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + int ret; + + mutex_lock(&dev_info->mlock); + if (iio_ring_enabled(dev_info)) + ret = ad7298_scan_from_ring(st, this_attr->address); + else + ret = ad7298_scan_direct(st, this_attr->address); + mutex_unlock(&dev_info->mlock); + + if (ret < 0) + return ret; + + return sprintf(buf, "%d\n", ret & RES_MASK(AD7298_BITS)); +} + +static IIO_DEV_ATTR_IN_RAW(0, ad7298_scan, 0); +static IIO_DEV_ATTR_IN_RAW(1, ad7298_scan, 1); +static IIO_DEV_ATTR_IN_RAW(2, ad7298_scan, 2); +static IIO_DEV_ATTR_IN_RAW(3, ad7298_scan, 3); +static IIO_DEV_ATTR_IN_RAW(4, ad7298_scan, 4); +static IIO_DEV_ATTR_IN_RAW(5, ad7298_scan, 5); +static IIO_DEV_ATTR_IN_RAW(6, ad7298_scan, 6); +static IIO_DEV_ATTR_IN_RAW(7, ad7298_scan, 7); + +static ssize_t ad7298_show_temp(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7298_state *st = iio_dev_get_devdata(dev_info); + int tmp; + + tmp = cpu_to_be16(AD7298_WRITE | AD7298_TSENSE | + AD7298_TAVG | st->ext_ref); + + mutex_lock(&dev_info->mlock); + spi_write(st->spi, (u8 *)&tmp, 2); + tmp = 0; + spi_write(st->spi, (u8 *)&tmp, 2); + usleep_range(101, 1000); /* sleep > 100us */ + spi_read(st->spi, (u8 *)&tmp, 2); + mutex_unlock(&dev_info->mlock); + + tmp = be16_to_cpu(tmp) & RES_MASK(AD7298_BITS); + + /* + * One LSB of the ADC corresponds to 0.25 deg C. + * The temperature reading is in 12-bit twos complement format + */ + + if (tmp & (1 << (AD7298_BITS - 1))) { + tmp = (4096 - tmp) * 250; + tmp -= (2 * tmp); + + } else { + tmp *= 250; /* temperature in milli degrees Celsius */ + } + + return sprintf(buf, "%d\n", tmp); +} + +static IIO_DEVICE_ATTR(temp0_input, S_IRUGO, ad7298_show_temp, NULL, 0); + +static ssize_t ad7298_show_scale(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7298_state *st = iio_dev_get_devdata(dev_info); + /* Corresponds to Vref / 2^(bits) */ + unsigned int scale_uv = (st->int_vref_mv * 1000) >> AD7298_BITS; + + return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000); +} +static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad7298_show_scale, NULL, 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_state *st = iio_dev_get_devdata(dev_info); + + return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name); +} +static IIO_DEVICE_ATTR(name, S_IRUGO, ad7298_show_name, NULL, 0); + +static struct attribute *ad7298_attributes[] = { + &iio_dev_attr_in0_raw.dev_attr.attr, + &iio_dev_attr_in1_raw.dev_attr.attr, + &iio_dev_attr_in2_raw.dev_attr.attr, + &iio_dev_attr_in3_raw.dev_attr.attr, + &iio_dev_attr_in4_raw.dev_attr.attr, + &iio_dev_attr_in5_raw.dev_attr.attr, + &iio_dev_attr_in6_raw.dev_attr.attr, + &iio_dev_attr_in7_raw.dev_attr.attr, + &iio_dev_attr_in_scale.dev_attr.attr, + &iio_dev_attr_temp0_input.dev_attr.attr, + &iio_dev_attr_name.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad7298_attribute_group = { + .attrs = ad7298_attributes, +}; + +static int __devinit ad7298_probe(struct spi_device *spi) +{ + struct ad7298_platform_data *pdata = spi->dev.platform_data; + struct ad7298_state *st; + int ret; + + st = kzalloc(sizeof(*st), GFP_KERNEL); + if (st == NULL) { + ret = -ENOMEM; + goto error_ret; + } + + st->reg = regulator_get(&spi->dev, "vcc"); + if (!IS_ERR(st->reg)) { + ret = regulator_enable(st->reg); + if (ret) + goto error_put_reg; + } + + spi_set_drvdata(spi, st); + + atomic_set(&st->protect_ring, 0); + st->spi = spi; + + st->indio_dev = iio_allocate_device(); + if (st->indio_dev == NULL) { + ret = -ENOMEM; + goto error_disable_reg; + } + + st->indio_dev->dev.parent = &spi->dev; + st->indio_dev->attrs = &ad7298_attribute_group; + st->indio_dev->dev_data = (void *)(st); + st->indio_dev->driver_module = THIS_MODULE; + st->indio_dev->modes = INDIO_DIRECT_MODE; + + /* Setup default message */ + + st->scan_single_xfer[0].tx_buf = &st->tx_buf[0]; + st->scan_single_xfer[0].len = 2; + st->scan_single_xfer[0].cs_change = 1; + st->scan_single_xfer[1].tx_buf = &st->tx_buf[1]; + st->scan_single_xfer[1].len = 2; + st->scan_single_xfer[1].cs_change = 1; + st->scan_single_xfer[2].rx_buf = &st->rx_buf[0]; + st->scan_single_xfer[2].len = 2; + + spi_message_init(&st->scan_single_msg); + spi_message_add_tail(&st->scan_single_xfer[0], &st->scan_single_msg); + spi_message_add_tail(&st->scan_single_xfer[1], &st->scan_single_msg); + spi_message_add_tail(&st->scan_single_xfer[2], &st->scan_single_msg); + + if (pdata && pdata->vref_mv) { + st->int_vref_mv = pdata->vref_mv; + st->ext_ref = AD7298_EXTREF; + } else { + st->int_vref_mv = AD7298_INTREF_mV; + } + + ret = ad7298_register_ring_funcs_and_init(st->indio_dev); + if (ret) + goto error_free_device; + + ret = iio_device_register(st->indio_dev); + if (ret) + goto error_free_device; + + ret = iio_ring_buffer_register(st->indio_dev->ring, 0); + if (ret) + goto error_cleanup_ring; + return 0; + +error_cleanup_ring: + ad7298_ring_cleanup(st->indio_dev); + iio_device_unregister(st->indio_dev); +error_free_device: + iio_free_device(st->indio_dev); +error_disable_reg: + if (!IS_ERR(st->reg)) + regulator_disable(st->reg); +error_put_reg: + if (!IS_ERR(st->reg)) + regulator_put(st->reg); + kfree(st); +error_ret: + return ret; +} + +static int __devexit ad7298_remove(struct spi_device *spi) +{ + struct ad7298_state *st = spi_get_drvdata(spi); + struct iio_dev *indio_dev = st->indio_dev; + + iio_ring_buffer_unregister(indio_dev->ring); + ad7298_ring_cleanup(indio_dev); + iio_device_unregister(indio_dev); + if (!IS_ERR(st->reg)) { + regulator_disable(st->reg); + regulator_put(st->reg); + } + kfree(st); + return 0; +} + +static const struct spi_device_id ad7298_id[] = { + {"ad7298", 0}, + {} +}; + +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 int __init ad7298_init(void) +{ + return spi_register_driver(&ad7298_driver); +} +module_init(ad7298_init); + +static void __exit ad7298_exit(void) +{ + spi_unregister_driver(&ad7298_driver); +} +module_exit(ad7298_exit); + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("Analog Devices AD7298 ADC"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("spi:ad7298"); diff --git a/drivers/staging/iio/adc/ad7298_ring.c b/drivers/staging/iio/adc/ad7298_ring.c new file mode 100644 index 000000000000..19d1aced1e6c --- /dev/null +++ b/drivers/staging/iio/adc/ad7298_ring.c @@ -0,0 +1,258 @@ +/* + * AD7298 SPI ADC driver + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#include <linux/interrupt.h> +#include <linux/workqueue.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/spi/spi.h> + +#include "../iio.h" +#include "../ring_generic.h" +#include "../ring_sw.h" +#include "../trigger.h" +#include "../sysfs.h" + +#include "ad7298.h" + +static IIO_SCAN_EL_C(in0, 0, 0, NULL); +static IIO_SCAN_EL_C(in1, 1, 0, NULL); +static IIO_SCAN_EL_C(in2, 2, 0, NULL); +static IIO_SCAN_EL_C(in3, 3, 0, NULL); +static IIO_SCAN_EL_C(in4, 4, 0, NULL); +static IIO_SCAN_EL_C(in5, 5, 0, NULL); +static IIO_SCAN_EL_C(in6, 6, 0, NULL); +static IIO_SCAN_EL_C(in7, 7, 0, NULL); + +static IIO_SCAN_EL_TIMESTAMP(8); +static IIO_CONST_ATTR_SCAN_EL_TYPE(timestamp, s, 64, 64); + +static IIO_CONST_ATTR(in_type, "u12/16") ; + +static struct attribute *ad7298_scan_el_attrs[] = { + &iio_scan_el_in0.dev_attr.attr, + &iio_const_attr_in0_index.dev_attr.attr, + &iio_scan_el_in1.dev_attr.attr, + &iio_const_attr_in1_index.dev_attr.attr, + &iio_scan_el_in2.dev_attr.attr, + &iio_const_attr_in2_index.dev_attr.attr, + &iio_scan_el_in3.dev_attr.attr, + &iio_const_attr_in3_index.dev_attr.attr, + &iio_scan_el_in4.dev_attr.attr, + &iio_const_attr_in4_index.dev_attr.attr, + &iio_scan_el_in5.dev_attr.attr, + &iio_const_attr_in5_index.dev_attr.attr, + &iio_scan_el_in6.dev_attr.attr, + &iio_const_attr_in6_index.dev_attr.attr, + &iio_scan_el_in7.dev_attr.attr, + &iio_const_attr_in7_index.dev_attr.attr, + &iio_const_attr_timestamp_index.dev_attr.attr, + &iio_scan_el_timestamp.dev_attr.attr, + &iio_const_attr_timestamp_type.dev_attr.attr, + &iio_const_attr_in_type.dev_attr.attr, + NULL, +}; + +static struct attribute_group ad7298_scan_el_group = { + .name = "scan_elements", + .attrs = ad7298_scan_el_attrs, +}; + +int ad7298_scan_from_ring(struct ad7298_state *st, long ch) +{ + struct iio_ring_buffer *ring = st->indio_dev->ring; + int ret; + u16 *ring_data; + + if (!(ring->scan_mask & (1 << ch))) { + ret = -EBUSY; + goto error_ret; + } + + ring_data = kmalloc(ring->access.get_bytes_per_datum(ring), GFP_KERNEL); + if (ring_data == NULL) { + ret = -ENOMEM; + goto error_ret; + } + ret = ring->access.read_last(ring, (u8 *) ring_data); + if (ret) + goto error_free_ring_data; + + ret = be16_to_cpu(ring_data[ch]); + +error_free_ring_data: + kfree(ring_data); +error_ret: + return ret; +} + +/** + * ad7298_ring_preenable() setup the parameters of the ring before enabling + * + * The complex nature of the setting of the number of bytes per datum is due + * to this driver currently ensuring that the timestamp is stored at an 8 + * byte boundary. + **/ +static int ad7298_ring_preenable(struct iio_dev *indio_dev) +{ + struct ad7298_state *st = indio_dev->dev_data; + struct iio_ring_buffer *ring = indio_dev->ring; + size_t d_size; + int i, m; + unsigned short command; + + d_size = ring->scan_count * (AD7298_STORAGE_BITS / 8); + + if (ring->scan_timestamp) { + d_size += sizeof(s64); + + if (d_size % sizeof(s64)) + d_size += sizeof(s64) - (d_size % sizeof(s64)); + } + + if (ring->access.set_bytes_per_datum) + ring->access.set_bytes_per_datum(ring, d_size); + + st->d_size = d_size; + + command = AD7298_WRITE | st->ext_ref; + + for (i = 0, m = AD7298_CH(0); i < AD7298_MAX_CHAN; i++, m >>= 1) + if (ring->scan_mask & (1 << i)) + command |= m; + + st->tx_buf[0] = cpu_to_be16(command); + + /* build spi ring message */ + st->ring_xfer[0].tx_buf = &st->tx_buf[0]; + st->ring_xfer[0].len = 2; + st->ring_xfer[0].cs_change = 1; + st->ring_xfer[1].tx_buf = &st->tx_buf[1]; + st->ring_xfer[1].len = 2; + st->ring_xfer[1].cs_change = 1; + + spi_message_init(&st->ring_msg); + spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg); + spi_message_add_tail(&st->ring_xfer[1], &st->ring_msg); + + for (i = 0; i < ring->scan_count; i++) { + st->ring_xfer[i + 2].rx_buf = &st->rx_buf[i]; + st->ring_xfer[i + 2].len = 2; + st->ring_xfer[i + 2].cs_change = 1; + spi_message_add_tail(&st->ring_xfer[i + 2], &st->ring_msg); + } + /* make sure last transfer cs_change is not set */ + st->ring_xfer[i + 1].cs_change = 0; + + return 0; +} + +/** + * ad7298_poll_func_th() th of trigger launched polling to ring buffer + * + * As sampling only occurs on spi comms occuring, leave timestamping until + * then. Some triggers will generate their own time stamp. Currently + * there is no way of notifying them when no one cares. + **/ +static void ad7298_poll_func_th(struct iio_dev *indio_dev, s64 time) +{ + struct ad7298_state *st = indio_dev->dev_data; + + schedule_work(&st->poll_work); + return; +} + +/** + * ad7298_poll_bh_to_ring() bh of trigger launched polling to ring buffer + * @work_s: the work struct through which this was scheduled + * + * Currently there is no option in this driver to disable the saving of + * timestamps within the ring. + * I think the one copy of this at a time was to avoid problems if the + * trigger was set far too high and the reads then locked up the computer. + **/ +static void ad7298_poll_bh_to_ring(struct work_struct *work_s) +{ + struct ad7298_state *st = container_of(work_s, struct ad7298_state, + poll_work); + struct iio_dev *indio_dev = st->indio_dev; + struct iio_sw_ring_buffer *sw_ring = iio_to_sw_ring(indio_dev->ring); + struct iio_ring_buffer *ring = indio_dev->ring; + s64 time_ns; + __u16 buf[16]; + int b_sent, i; + + /* Ensure only one copy of this function running at a time */ + if (atomic_inc_return(&st->protect_ring) > 1) + return; + + b_sent = spi_sync(st->spi, &st->ring_msg); + if (b_sent) + goto done; + + if (ring->scan_timestamp) { + time_ns = iio_get_time_ns(); + memcpy((u8 *)buf + st->d_size - sizeof(s64), + &time_ns, sizeof(time_ns)); + } + + for (i = 0; i < ring->scan_count; i++) + buf[i] = be16_to_cpu(st->rx_buf[i]); + + indio_dev->ring->access.store_to(&sw_ring->buf, (u8 *)buf, time_ns); +done: + atomic_dec(&st->protect_ring); +} + +int ad7298_register_ring_funcs_and_init(struct iio_dev *indio_dev) +{ + struct ad7298_state *st = indio_dev->dev_data; + int ret; + + indio_dev->ring = iio_sw_rb_allocate(indio_dev); + if (!indio_dev->ring) { + ret = -ENOMEM; + goto error_ret; + } + /* Effectively select the ring buffer implementation */ + iio_ring_sw_register_funcs(&indio_dev->ring->access); + ret = iio_alloc_pollfunc(indio_dev, NULL, &ad7298_poll_func_th); + if (ret) + goto error_deallocate_sw_rb; + + /* Ring buffer functions - here trigger setup related */ + + indio_dev->ring->preenable = &ad7298_ring_preenable; + indio_dev->ring->postenable = &iio_triggered_ring_postenable; + indio_dev->ring->predisable = &iio_triggered_ring_predisable; + indio_dev->ring->scan_el_attrs = &ad7298_scan_el_group; + indio_dev->ring->scan_timestamp = true; + + INIT_WORK(&st->poll_work, &ad7298_poll_bh_to_ring); + + /* Flag that polled ring buffering is possible */ + indio_dev->modes |= INDIO_RING_TRIGGERED; + return 0; +error_deallocate_sw_rb: + iio_sw_rb_free(indio_dev->ring); +error_ret: + return ret; +} + +void ad7298_ring_cleanup(struct iio_dev *indio_dev) +{ + if (indio_dev->trig) { + iio_put_trigger(indio_dev->trig); + iio_trigger_dettach_poll_func(indio_dev->trig, + indio_dev->pollfunc); + } + kfree(indio_dev->pollfunc); + iio_sw_rb_free(indio_dev->ring); +} |