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Commit 6ea589d5 authored by Ram Chandrasekar's avatar Ram Chandrasekar
Browse files

drivers: thermal: Add config sysfs entry support for thermal zones 



Add config sysfs entry support for thermal zones. This sysfs will read
the entire configuration of the thermal zone.

Change-Id: I2bf7d14289958d58b116d46bf843d2b2b77dcbbb
Signed-off-by: default avatarRam Chandrasekar <rkumbako@codeaurora.org>
parent 18ed6679

drivers/thermal/thermal_sysfs.c

+148 −1
Original line number Diff line number Diff line
@@ -8,7 +8,7 @@ 
 *  Copyright (C) 2008 Intel Corp

 *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>

 *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>

 *  Copyright (c) 2019, The Linux Foundation. All rights reserved.

 *  Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.

 */



#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -24,6 +24,147 @@ 


/* sys I/F for thermal zone */



#ifdef CONFIG_QTI_THERMAL

#define UINT_MAX_CHARACTER 11



static int fetch_and_populate(char *buf, struct thermal_zone_device *tz,

		int idx, int offset, size_t size, bool is_hyst)

{

	int ret = 0, temp;



	if (!is_hyst)

		ret = tz->ops->get_trip_temp(tz, idx, &temp);

	else

		ret = tz->ops->get_trip_hyst(tz, idx, &temp);

	if (ret)

		return ret;

	offset += scnprintf(buf + offset, size - offset, "%d ", temp);



	return offset;

}



static ssize_t

config_show(struct device *dev, struct device_attribute *attr, char *buf)

{

	struct thermal_zone_device *tz = to_thermal_zone(dev);

	int offset = 0, ret, i;

	size_t buf_size = 0;

	int buf_offset = 0, buf1_offset = 0, buf2_offset = 0;

	char *buf_temp = NULL, *buf_hyst = NULL, *buf_trip = NULL;

	char *buf_cdev = NULL, *buf_cdev_upper = NULL, *buf_cdev_lower = NULL;

	struct thermal_instance *instance;



	offset += scnprintf(buf + offset, PAGE_SIZE - offset, "sensor %s\n",

				tz->type);

	offset += scnprintf(buf + offset, PAGE_SIZE - offset, "policy %s\n",

				tz->governor->name);

	offset += scnprintf(buf + offset, PAGE_SIZE - offset,

				"polling_delay %d\n", tz->polling_delay);

	offset += scnprintf(buf + offset, PAGE_SIZE - offset,

				"passive_polling_delay %d\n",

				tz->passive_delay);

	if (!tz->trips || !tz->ops->get_trip_temp)

		return offset;



	buf_size = tz->trips * UINT_MAX_CHARACTER;

	buf_temp = kzalloc(buf_size, GFP_KERNEL);

	buf_hyst = kzalloc(buf_size, GFP_KERNEL);

	buf_trip = kzalloc(buf_size, GFP_KERNEL);

	for (i = 0; i < tz->trips; i++) {

		buf_offset = scnprintf(buf_trip + buf_offset,

				buf_size - buf_offset, "%d ", i);



		ret = fetch_and_populate(buf_temp, tz, i, buf1_offset,

				buf_size, false);

		if (ret < 0)

			goto config_exit;

		buf1_offset = ret;



		if (!tz->ops->get_trip_hyst)

			continue;



		ret = fetch_and_populate(buf_hyst, tz, i, buf2_offset,

				buf_size, true);

		if (ret < 0)

			goto config_exit;

		buf2_offset = ret;

	}

	offset += scnprintf(buf + offset, PAGE_SIZE - offset,

				"trip %s\n", buf_trip);

	offset += scnprintf(buf + offset, PAGE_SIZE - offset,

				"trip_threshold %s\n", buf_temp);

	if (buf2_offset)

		offset += scnprintf(buf + offset, PAGE_SIZE - offset,

				"trip_threshold_clr %s\n", buf_hyst);



	buf_size = 0;

	buf_offset = 0;

	buf1_offset = 0;

	buf2_offset = 0;

	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {

		if (instance->cdev)

			buf_size++;

	}

	if (!buf_size)

		goto config_exit;

	buf_size *= THERMAL_NAME_LENGTH;

	buf_cdev =  kzalloc(buf_size, GFP_KERNEL);

	buf_cdev_upper = kzalloc(buf_size, GFP_KERNEL);

	buf_cdev_lower = kzalloc(buf_size, GFP_KERNEL);

	for (i = 0; i < tz->trips; i++) {

		bool first_entry = true;



		list_for_each_entry(instance, &tz->thermal_instances, tz_node) {

			if (!instance->cdev || instance->trip != i)

				continue;

			if (first_entry) {

				first_entry = false;

				buf_offset += scnprintf(

						buf_cdev + buf_offset,

						buf_size - buf_offset,

						" %s", instance->cdev->type);

				buf1_offset += scnprintf(

						buf_cdev_upper + buf1_offset,

						buf_size - buf1_offset,

						" %d", instance->upper);

				buf2_offset += scnprintf(

						buf_cdev_lower + buf2_offset,

						buf_size - buf2_offset,

						" %d", instance->lower);

			} else {

				buf_offset += scnprintf(

						buf_cdev + buf_offset,

						buf_size - buf_offset,

						"+%s", instance->cdev->type);

				buf1_offset += scnprintf(

						buf_cdev_upper + buf1_offset,

						buf_size - buf1_offset,

						"+%d", instance->upper);

				buf2_offset += scnprintf(

						buf_cdev_lower + buf2_offset,

						buf_size - buf2_offset,

						"+%d", instance->lower);

			}

		}

	}

	offset += scnprintf(buf + offset, PAGE_SIZE - offset,

				"device %s\n", buf_cdev);

	offset += scnprintf(buf + offset, PAGE_SIZE - offset,

				"upper_limit %s\n", buf_cdev_upper);

	offset += scnprintf(buf + offset, PAGE_SIZE - offset,

				"lower_limit %s\n", buf_cdev_lower);



config_exit:

	kfree(buf_trip);

	kfree(buf_temp);

	kfree(buf_hyst);

	kfree(buf_cdev);

	kfree(buf_cdev_upper);

	kfree(buf_cdev_lower);

	return (ret < 0) ? ret : offset;

}

#endif



static ssize_t

type_show(struct device *dev, struct device_attribute *attr, char *buf)

{
@@ -424,6 +565,9 @@ create_s32_tzp_attr(offset); 
 * present on the sysfs interface.

 */

static DEVICE_ATTR_RO(type);

#if IS_ENABLED(CONFIG_QTI_THERMAL)

static DEVICE_ATTR_RO(config);

#endif

static DEVICE_ATTR_RO(temp);

static DEVICE_ATTR_RW(policy);

static DEVICE_ATTR_RO(available_policies);
@@ -436,6 +580,9 @@ static DEVICE_ATTR_RW(passive); 
/* These attributes are unconditionally added to a thermal zone */

static struct attribute *thermal_zone_dev_attrs[] = {

	&dev_attr_type.attr,

#if IS_ENABLED(CONFIG_QTI_THERMAL)

	&dev_attr_config.attr,

#endif

	&dev_attr_temp.attr,

#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))

	&dev_attr_emul_temp.attr,