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Commit a1c64abe authored Dec 18, 2013 by Jie Cheng

sensors: add enable and poll_delay APIs for sensor class driver



The sensor class driver will create the "enable" and "poll_delay"
handles in the "/sys/class/sensors/xxx/" for each sensor driver.
The userspace code could easily find the control interface by
searching the "/sys/class/sensors/" folder.

Change-Id: Ia18f062262e4b78db7d7de87acb49dfcf485063b
Signed-off-by: Jie Cheng <rockiec@codeaurora.org>

parent b71a5b93

drivers/sensors/sensors_class.c

+74 −0

Original line number	Diff line number	Diff line
		@@ -105,6 +105,78 @@ static ssize_t sensors_fifo_max_show(struct device *dev,
		sensors_cdev->fifo_max_event_count);
		}

		static ssize_t sensors_enable_store(struct device *dev,
		struct device_attribute attr, const char buf, size_t size)
		{
		struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
		ssize_t ret = -EINVAL;
		unsigned long data = 0;

		ret = kstrtoul(buf, 10, &data);
		if (ret)
		return ret;
		if (data > 1) {
		dev_err(dev, "Invalid value of input, input=%ld\n", data);
		return -EINVAL;
		}

		if (sensors_cdev->sensors_enable == NULL) {
		dev_err(dev, "Invalid sensor class enable handle\n");
		return -EINVAL;
		}
		ret = sensors_cdev->sensors_enable(sensors_cdev, data);
		if (ret)
		return ret;

		sensors_cdev->enabled = data;
		return size;
		}


		static ssize_t sensors_enable_show(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
		return snprintf(buf, PAGE_SIZE, "%u\n",
		sensors_cdev->enabled);
		}

		static ssize_t sensors_delay_store(struct device *dev,
		struct device_attribute attr, const char buf, size_t size)
		{
		struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
		ssize_t ret = -EINVAL;
		unsigned long data = 0;

		ret = kstrtoul(buf, 10, &data);
		if (ret)
		return ret;
		/* The data unit is millisecond, the min_delay unit is microseconds. */
		if ((data * 1000) < sensors_cdev->min_delay) {
		dev_err(dev, "Invalid value of delay, delay=%ld\n", data);
		return -EINVAL;
		}
		if (sensors_cdev->sensors_poll_delay == NULL) {
		dev_err(dev, "Invalid sensor class delay handle\n");
		return -EINVAL;
		}
		ret = sensors_cdev->sensors_poll_delay(sensors_cdev, data);
		if (ret)
		return ret;

		sensors_cdev->delay_msec = data;
		return size;
		}

		static ssize_t sensors_delay_show(struct device *dev,
		struct device_attribute attr, char buf)
		{
		struct sensors_classdev *sensors_cdev = dev_get_drvdata(dev);
		return snprintf(buf, PAGE_SIZE, "%u\n",
		sensors_cdev->delay_msec);
		}


		static struct device_attribute sensors_class_attrs[] = {
		__ATTR(name, 0444, sensors_name_show, NULL),
		__ATTR(vendor, 0444, sensors_vendor_show, NULL),
		@@ -117,6 +189,8 @@ static struct device_attribute sensors_class_attrs[] = {
		__ATTR(min_delay, 0444, sensors_min_delay_show, NULL),
		__ATTR(fifo_reserved_event_count, 0444, sensors_fifo_event_show, NULL),
		__ATTR(fifo_max_event_count, 0444, sensors_fifo_max_show, NULL),
		__ATTR(enable, 0664, sensors_enable_show, sensors_enable_store),
		__ATTR(poll_delay, 0664, sensors_delay_show, sensors_delay_store),
		__ATTR_NULL,
		};

include/linux/sensors.h

+36 −1

Original line number	Diff line number	Diff line
		@@ -47,6 +47,34 @@
		#define SENSOR_TYPE_STEP_COUNTER 19
		#define SENSOR_TYPE_GEOMAGNETIC_ROTATION_VECTOR 20

		/**
		* struct sensors_classdev - hold the sensor general parameters and APIs
		* @dev: The device to register.
		* @node: The list for the all the sensor drivers.
		* @name: Name of this sensor.
		* @vendor: The vendor of the hardware part.
		* @handle: The handle that identifies this sensors.
		* @type: The sensor type.
		* @max_range: The maximum range of this sensor's value in SI units.
		* @resolution: The smallest difference between two values reported by
		* this sensor.
		* @sensor_power: The rough estimate of this sensor's power consumption
		* in mA.
		* @min_delay: This value depends on the trigger mode:
		* continuous: minimum period allowed in microseconds
		* on-change : 0
		* one-shot :-1
		* special : 0, unless otherwise noted
		* @fifo_reserved_event_count: The number of events reserved for this sensor
		* in the batch mode FIFO.
		* @fifo_max_event_count: The maximum number of events of this sensor
		* that could be batched.
		* @enabled: Store the sensor driver enable status.
		* @delay_msec: Store the sensor driver delay value. The data unit is
		* millisecond.
		* @sensors_enable: The handle for enable and disable sensor.
		* @sensors_poll_delay: The handle for set the sensor polling delay time.
		*/
		struct sensors_classdev {
		struct device *dev;
		struct list_head node;
		@@ -61,6 +89,13 @@ struct sensors_classdev {
		int min_delay;
		int fifo_reserved_event_count;
		int fifo_max_event_count;
		unsigned int enabled;
		unsigned int delay_msec;
		/* enable and disable the sensor handle*/
		int (sensors_enable)(struct sensors_classdev sensors_cdev,
		unsigned int enabled);
		int (sensors_poll_delay)(struct sensors_classdev sensors_cdev,
		unsigned int delay_msec);
		};

		extern int sensors_classdev_register(struct device *parent,