747 lines
20 KiB
C
747 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* V4L2 flash LED sub-device registration helpers.
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*
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* Copyright (C) 2015 Samsung Electronics Co., Ltd
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* Author: Jacek Anaszewski <j.anaszewski@samsung.com>
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*/
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#include <linux/led-class-flash.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <media/v4l2-flash-led-class.h>
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#define has_flash_op(v4l2_flash, op) \
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(v4l2_flash && v4l2_flash->ops && v4l2_flash->ops->op)
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#define call_flash_op(v4l2_flash, op, arg) \
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(has_flash_op(v4l2_flash, op) ? \
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v4l2_flash->ops->op(v4l2_flash, arg) : \
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-EINVAL)
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enum ctrl_init_data_id {
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LED_MODE,
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TORCH_INTENSITY,
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FLASH_INTENSITY,
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INDICATOR_INTENSITY,
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FLASH_TIMEOUT,
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STROBE_SOURCE,
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/*
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* Only above values are applicable to
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* the 'ctrls' array in the struct v4l2_flash.
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*/
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FLASH_STROBE,
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STROBE_STOP,
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STROBE_STATUS,
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FLASH_FAULT,
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NUM_FLASH_CTRLS,
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};
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static enum led_brightness __intensity_to_led_brightness(
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struct v4l2_ctrl *ctrl, s32 intensity)
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{
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intensity -= ctrl->minimum;
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intensity /= (u32) ctrl->step;
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/*
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* Indicator LEDs, unlike torch LEDs, are turned on/off basing on
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* the state of V4L2_CID_FLASH_INDICATOR_INTENSITY control only.
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* Therefore it must be possible to set it to 0 level which in
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* the LED subsystem reflects LED_OFF state.
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*/
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if (ctrl->minimum)
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++intensity;
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return intensity;
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}
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static s32 __led_brightness_to_intensity(struct v4l2_ctrl *ctrl,
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enum led_brightness brightness)
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{
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/*
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* Indicator LEDs, unlike torch LEDs, are turned on/off basing on
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* the state of V4L2_CID_FLASH_INDICATOR_INTENSITY control only.
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* Do not decrement brightness read from the LED subsystem for
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* indicator LED as it may equal 0. For torch LEDs this function
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* is called only when V4L2_FLASH_LED_MODE_TORCH is set and the
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* brightness read is guaranteed to be greater than 0. In the mode
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* V4L2_FLASH_LED_MODE_NONE the cached torch intensity value is used.
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*/
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if (ctrl->id != V4L2_CID_FLASH_INDICATOR_INTENSITY)
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--brightness;
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return (brightness * ctrl->step) + ctrl->minimum;
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}
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static int v4l2_flash_set_led_brightness(struct v4l2_flash *v4l2_flash,
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struct v4l2_ctrl *ctrl)
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{
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struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
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struct led_classdev *led_cdev;
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enum led_brightness brightness;
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if (has_flash_op(v4l2_flash, intensity_to_led_brightness))
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brightness = call_flash_op(v4l2_flash,
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intensity_to_led_brightness,
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ctrl->val);
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else
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brightness = __intensity_to_led_brightness(ctrl, ctrl->val);
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/*
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* In case a LED Flash class driver provides ops for custom
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* brightness <-> intensity conversion, it also must have defined
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* related v4l2 control step == 1. In such a case a backward conversion
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* from led brightness to v4l2 intensity is required to find out the
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* aligned intensity value.
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*/
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if (has_flash_op(v4l2_flash, led_brightness_to_intensity))
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ctrl->val = call_flash_op(v4l2_flash,
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led_brightness_to_intensity,
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brightness);
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if (ctrl == ctrls[TORCH_INTENSITY]) {
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if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
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return 0;
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if (WARN_ON_ONCE(!v4l2_flash->fled_cdev))
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return -EINVAL;
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led_cdev = &v4l2_flash->fled_cdev->led_cdev;
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} else {
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if (WARN_ON_ONCE(!v4l2_flash->iled_cdev))
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return -EINVAL;
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led_cdev = v4l2_flash->iled_cdev;
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}
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return led_set_brightness_sync(led_cdev, brightness);
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}
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static int v4l2_flash_update_led_brightness(struct v4l2_flash *v4l2_flash,
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struct v4l2_ctrl *ctrl)
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{
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struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
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struct led_classdev *led_cdev;
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int ret;
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if (ctrl == ctrls[TORCH_INTENSITY]) {
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/*
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* Update torch brightness only if in TORCH_MODE. In other modes
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* torch led is turned off, which would spuriously inform the
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* user space that V4L2_CID_FLASH_TORCH_INTENSITY control value
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* has changed to 0.
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*/
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if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
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return 0;
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if (WARN_ON_ONCE(!v4l2_flash->fled_cdev))
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return -EINVAL;
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led_cdev = &v4l2_flash->fled_cdev->led_cdev;
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} else {
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if (WARN_ON_ONCE(!v4l2_flash->iled_cdev))
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return -EINVAL;
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led_cdev = v4l2_flash->iled_cdev;
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}
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ret = led_update_brightness(led_cdev);
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if (ret < 0)
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return ret;
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if (has_flash_op(v4l2_flash, led_brightness_to_intensity))
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ctrl->val = call_flash_op(v4l2_flash,
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led_brightness_to_intensity,
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led_cdev->brightness);
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else
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ctrl->val = __led_brightness_to_intensity(ctrl,
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led_cdev->brightness);
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return 0;
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}
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static int v4l2_flash_g_volatile_ctrl(struct v4l2_ctrl *c)
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{
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struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c);
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struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
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bool is_strobing;
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int ret;
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switch (c->id) {
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case V4L2_CID_FLASH_TORCH_INTENSITY:
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case V4L2_CID_FLASH_INDICATOR_INTENSITY:
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return v4l2_flash_update_led_brightness(v4l2_flash, c);
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}
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if (!fled_cdev)
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return -EINVAL;
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switch (c->id) {
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case V4L2_CID_FLASH_INTENSITY:
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ret = led_update_flash_brightness(fled_cdev);
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if (ret < 0)
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return ret;
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/*
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* No conversion is needed as LED Flash class also uses
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* microamperes for flash intensity units.
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*/
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c->val = fled_cdev->brightness.val;
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return 0;
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case V4L2_CID_FLASH_STROBE_STATUS:
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ret = led_get_flash_strobe(fled_cdev, &is_strobing);
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if (ret < 0)
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return ret;
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c->val = is_strobing;
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return 0;
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case V4L2_CID_FLASH_FAULT:
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/* LED faults map directly to V4L2 flash faults */
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return led_get_flash_fault(fled_cdev, &c->val);
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default:
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return -EINVAL;
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}
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}
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static bool __software_strobe_mode_inactive(struct v4l2_ctrl **ctrls)
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{
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return ((ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_FLASH) ||
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(ctrls[STROBE_SOURCE] && (ctrls[STROBE_SOURCE]->val !=
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V4L2_FLASH_STROBE_SOURCE_SOFTWARE)));
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}
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static int v4l2_flash_s_ctrl(struct v4l2_ctrl *c)
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{
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struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c);
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struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
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struct led_classdev *led_cdev;
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struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
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bool external_strobe;
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int ret = 0;
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switch (c->id) {
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case V4L2_CID_FLASH_TORCH_INTENSITY:
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case V4L2_CID_FLASH_INDICATOR_INTENSITY:
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return v4l2_flash_set_led_brightness(v4l2_flash, c);
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}
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if (!fled_cdev)
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return -EINVAL;
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led_cdev = &fled_cdev->led_cdev;
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switch (c->id) {
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case V4L2_CID_FLASH_LED_MODE:
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switch (c->val) {
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case V4L2_FLASH_LED_MODE_NONE:
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led_set_brightness_sync(led_cdev, LED_OFF);
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return led_set_flash_strobe(fled_cdev, false);
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case V4L2_FLASH_LED_MODE_FLASH:
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/* Turn the torch LED off */
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led_set_brightness_sync(led_cdev, LED_OFF);
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if (ctrls[STROBE_SOURCE]) {
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external_strobe = (ctrls[STROBE_SOURCE]->val ==
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V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
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ret = call_flash_op(v4l2_flash,
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external_strobe_set,
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external_strobe);
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}
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return ret;
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case V4L2_FLASH_LED_MODE_TORCH:
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if (ctrls[STROBE_SOURCE]) {
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ret = call_flash_op(v4l2_flash,
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external_strobe_set,
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false);
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if (ret < 0)
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return ret;
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}
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/* Stop flash strobing */
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ret = led_set_flash_strobe(fled_cdev, false);
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if (ret < 0)
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return ret;
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return v4l2_flash_set_led_brightness(v4l2_flash,
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ctrls[TORCH_INTENSITY]);
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}
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break;
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case V4L2_CID_FLASH_STROBE_SOURCE:
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external_strobe = (c->val == V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
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/*
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* For some hardware arrangements setting strobe source may
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* affect torch mode. Therefore, if not in the flash mode,
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* cache only this setting. It will be applied upon switching
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* to flash mode.
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*/
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if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_FLASH)
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return 0;
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return call_flash_op(v4l2_flash, external_strobe_set,
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external_strobe);
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case V4L2_CID_FLASH_STROBE:
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if (__software_strobe_mode_inactive(ctrls))
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return -EBUSY;
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return led_set_flash_strobe(fled_cdev, true);
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case V4L2_CID_FLASH_STROBE_STOP:
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if (__software_strobe_mode_inactive(ctrls))
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return -EBUSY;
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return led_set_flash_strobe(fled_cdev, false);
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case V4L2_CID_FLASH_TIMEOUT:
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/*
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* No conversion is needed as LED Flash class also uses
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* microseconds for flash timeout units.
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*/
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return led_set_flash_timeout(fled_cdev, c->val);
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case V4L2_CID_FLASH_INTENSITY:
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/*
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* No conversion is needed as LED Flash class also uses
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* microamperes for flash intensity units.
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*/
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return led_set_flash_brightness(fled_cdev, c->val);
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}
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return -EINVAL;
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}
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static const struct v4l2_ctrl_ops v4l2_flash_ctrl_ops = {
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.g_volatile_ctrl = v4l2_flash_g_volatile_ctrl,
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.s_ctrl = v4l2_flash_s_ctrl,
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};
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static void __lfs_to_v4l2_ctrl_config(struct led_flash_setting *s,
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struct v4l2_ctrl_config *c)
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{
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c->min = s->min;
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c->max = s->max;
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c->step = s->step;
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c->def = s->val;
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}
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static void __fill_ctrl_init_data(struct v4l2_flash *v4l2_flash,
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struct v4l2_flash_config *flash_cfg,
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struct v4l2_flash_ctrl_data *ctrl_init_data)
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{
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struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
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struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
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struct v4l2_ctrl_config *ctrl_cfg;
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u32 mask;
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/* Init INDICATOR_INTENSITY ctrl data */
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if (v4l2_flash->iled_cdev) {
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ctrl_init_data[INDICATOR_INTENSITY].cid =
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V4L2_CID_FLASH_INDICATOR_INTENSITY;
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ctrl_cfg = &ctrl_init_data[INDICATOR_INTENSITY].config;
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__lfs_to_v4l2_ctrl_config(&flash_cfg->intensity,
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ctrl_cfg);
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ctrl_cfg->id = V4L2_CID_FLASH_INDICATOR_INTENSITY;
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ctrl_cfg->min = 0;
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ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
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V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
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}
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if (!led_cdev || WARN_ON(!(led_cdev->flags & LED_DEV_CAP_FLASH)))
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return;
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/* Init FLASH_FAULT ctrl data */
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if (flash_cfg->flash_faults) {
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ctrl_init_data[FLASH_FAULT].cid = V4L2_CID_FLASH_FAULT;
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ctrl_cfg = &ctrl_init_data[FLASH_FAULT].config;
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ctrl_cfg->id = V4L2_CID_FLASH_FAULT;
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ctrl_cfg->max = flash_cfg->flash_faults;
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ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
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V4L2_CTRL_FLAG_READ_ONLY;
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}
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/* Init FLASH_LED_MODE ctrl data */
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mask = 1 << V4L2_FLASH_LED_MODE_NONE |
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1 << V4L2_FLASH_LED_MODE_TORCH;
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if (led_cdev->flags & LED_DEV_CAP_FLASH)
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mask |= 1 << V4L2_FLASH_LED_MODE_FLASH;
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ctrl_init_data[LED_MODE].cid = V4L2_CID_FLASH_LED_MODE;
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ctrl_cfg = &ctrl_init_data[LED_MODE].config;
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ctrl_cfg->id = V4L2_CID_FLASH_LED_MODE;
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ctrl_cfg->max = V4L2_FLASH_LED_MODE_TORCH;
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ctrl_cfg->menu_skip_mask = ~mask;
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ctrl_cfg->def = V4L2_FLASH_LED_MODE_NONE;
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ctrl_cfg->flags = 0;
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/* Init TORCH_INTENSITY ctrl data */
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ctrl_init_data[TORCH_INTENSITY].cid = V4L2_CID_FLASH_TORCH_INTENSITY;
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ctrl_cfg = &ctrl_init_data[TORCH_INTENSITY].config;
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__lfs_to_v4l2_ctrl_config(&flash_cfg->intensity, ctrl_cfg);
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ctrl_cfg->id = V4L2_CID_FLASH_TORCH_INTENSITY;
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ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
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V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
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/* Init FLASH_STROBE ctrl data */
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ctrl_init_data[FLASH_STROBE].cid = V4L2_CID_FLASH_STROBE;
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ctrl_cfg = &ctrl_init_data[FLASH_STROBE].config;
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ctrl_cfg->id = V4L2_CID_FLASH_STROBE;
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/* Init STROBE_STOP ctrl data */
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ctrl_init_data[STROBE_STOP].cid = V4L2_CID_FLASH_STROBE_STOP;
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ctrl_cfg = &ctrl_init_data[STROBE_STOP].config;
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ctrl_cfg->id = V4L2_CID_FLASH_STROBE_STOP;
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/* Init FLASH_STROBE_SOURCE ctrl data */
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if (flash_cfg->has_external_strobe) {
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mask = (1 << V4L2_FLASH_STROBE_SOURCE_SOFTWARE) |
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(1 << V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
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ctrl_init_data[STROBE_SOURCE].cid =
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V4L2_CID_FLASH_STROBE_SOURCE;
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ctrl_cfg = &ctrl_init_data[STROBE_SOURCE].config;
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ctrl_cfg->id = V4L2_CID_FLASH_STROBE_SOURCE;
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ctrl_cfg->max = V4L2_FLASH_STROBE_SOURCE_EXTERNAL;
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ctrl_cfg->menu_skip_mask = ~mask;
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ctrl_cfg->def = V4L2_FLASH_STROBE_SOURCE_SOFTWARE;
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}
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/* Init STROBE_STATUS ctrl data */
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if (has_flash_op(fled_cdev, strobe_get)) {
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ctrl_init_data[STROBE_STATUS].cid =
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V4L2_CID_FLASH_STROBE_STATUS;
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ctrl_cfg = &ctrl_init_data[STROBE_STATUS].config;
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ctrl_cfg->id = V4L2_CID_FLASH_STROBE_STATUS;
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ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
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V4L2_CTRL_FLAG_READ_ONLY;
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}
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/* Init FLASH_TIMEOUT ctrl data */
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if (has_flash_op(fled_cdev, timeout_set)) {
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ctrl_init_data[FLASH_TIMEOUT].cid = V4L2_CID_FLASH_TIMEOUT;
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ctrl_cfg = &ctrl_init_data[FLASH_TIMEOUT].config;
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__lfs_to_v4l2_ctrl_config(&fled_cdev->timeout, ctrl_cfg);
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ctrl_cfg->id = V4L2_CID_FLASH_TIMEOUT;
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}
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/* Init FLASH_INTENSITY ctrl data */
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if (has_flash_op(fled_cdev, flash_brightness_set)) {
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ctrl_init_data[FLASH_INTENSITY].cid = V4L2_CID_FLASH_INTENSITY;
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ctrl_cfg = &ctrl_init_data[FLASH_INTENSITY].config;
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__lfs_to_v4l2_ctrl_config(&fled_cdev->brightness, ctrl_cfg);
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ctrl_cfg->id = V4L2_CID_FLASH_INTENSITY;
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ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
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V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
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}
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}
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static int v4l2_flash_init_controls(struct v4l2_flash *v4l2_flash,
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struct v4l2_flash_config *flash_cfg)
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{
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struct v4l2_flash_ctrl_data *ctrl_init_data;
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struct v4l2_ctrl *ctrl;
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|
struct v4l2_ctrl_config *ctrl_cfg;
|
|
int i, ret, num_ctrls = 0;
|
|
|
|
v4l2_flash->ctrls = devm_kcalloc(v4l2_flash->sd.dev,
|
|
STROBE_SOURCE + 1,
|
|
sizeof(*v4l2_flash->ctrls),
|
|
GFP_KERNEL);
|
|
if (!v4l2_flash->ctrls)
|
|
return -ENOMEM;
|
|
|
|
/* allocate memory dynamically so as not to exceed stack frame size */
|
|
ctrl_init_data = kcalloc(NUM_FLASH_CTRLS, sizeof(*ctrl_init_data),
|
|
GFP_KERNEL);
|
|
if (!ctrl_init_data)
|
|
return -ENOMEM;
|
|
|
|
__fill_ctrl_init_data(v4l2_flash, flash_cfg, ctrl_init_data);
|
|
|
|
for (i = 0; i < NUM_FLASH_CTRLS; ++i)
|
|
if (ctrl_init_data[i].cid)
|
|
++num_ctrls;
|
|
|
|
v4l2_ctrl_handler_init(&v4l2_flash->hdl, num_ctrls);
|
|
|
|
for (i = 0; i < NUM_FLASH_CTRLS; ++i) {
|
|
ctrl_cfg = &ctrl_init_data[i].config;
|
|
if (!ctrl_init_data[i].cid)
|
|
continue;
|
|
|
|
if (ctrl_cfg->id == V4L2_CID_FLASH_LED_MODE ||
|
|
ctrl_cfg->id == V4L2_CID_FLASH_STROBE_SOURCE)
|
|
ctrl = v4l2_ctrl_new_std_menu(&v4l2_flash->hdl,
|
|
&v4l2_flash_ctrl_ops,
|
|
ctrl_cfg->id,
|
|
ctrl_cfg->max,
|
|
ctrl_cfg->menu_skip_mask,
|
|
ctrl_cfg->def);
|
|
else
|
|
ctrl = v4l2_ctrl_new_std(&v4l2_flash->hdl,
|
|
&v4l2_flash_ctrl_ops,
|
|
ctrl_cfg->id,
|
|
ctrl_cfg->min,
|
|
ctrl_cfg->max,
|
|
ctrl_cfg->step,
|
|
ctrl_cfg->def);
|
|
|
|
if (ctrl)
|
|
ctrl->flags |= ctrl_cfg->flags;
|
|
|
|
if (i <= STROBE_SOURCE)
|
|
v4l2_flash->ctrls[i] = ctrl;
|
|
}
|
|
|
|
kfree(ctrl_init_data);
|
|
|
|
if (v4l2_flash->hdl.error) {
|
|
ret = v4l2_flash->hdl.error;
|
|
goto error_free_handler;
|
|
}
|
|
|
|
v4l2_ctrl_handler_setup(&v4l2_flash->hdl);
|
|
|
|
v4l2_flash->sd.ctrl_handler = &v4l2_flash->hdl;
|
|
|
|
return 0;
|
|
|
|
error_free_handler:
|
|
v4l2_ctrl_handler_free(&v4l2_flash->hdl);
|
|
return ret;
|
|
}
|
|
|
|
static int __sync_device_with_v4l2_controls(struct v4l2_flash *v4l2_flash)
|
|
{
|
|
struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
|
|
struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
|
|
int ret = 0;
|
|
|
|
if (ctrls[TORCH_INTENSITY]) {
|
|
ret = v4l2_flash_set_led_brightness(v4l2_flash,
|
|
ctrls[TORCH_INTENSITY]);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (ctrls[INDICATOR_INTENSITY]) {
|
|
ret = v4l2_flash_set_led_brightness(v4l2_flash,
|
|
ctrls[INDICATOR_INTENSITY]);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (ctrls[FLASH_TIMEOUT]) {
|
|
if (WARN_ON_ONCE(!fled_cdev))
|
|
return -EINVAL;
|
|
|
|
ret = led_set_flash_timeout(fled_cdev,
|
|
ctrls[FLASH_TIMEOUT]->val);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (ctrls[FLASH_INTENSITY]) {
|
|
if (WARN_ON_ONCE(!fled_cdev))
|
|
return -EINVAL;
|
|
|
|
ret = led_set_flash_brightness(fled_cdev,
|
|
ctrls[FLASH_INTENSITY]->val);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* For some hardware arrangements setting strobe source may affect
|
|
* torch mode. Synchronize strobe source setting only if not in torch
|
|
* mode. For torch mode case it will get synchronized upon switching
|
|
* to flash mode.
|
|
*/
|
|
if (ctrls[STROBE_SOURCE] &&
|
|
ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
|
|
ret = call_flash_op(v4l2_flash, external_strobe_set,
|
|
ctrls[STROBE_SOURCE]->val);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* V4L2 subdev internal operations
|
|
*/
|
|
|
|
static int v4l2_flash_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
|
|
{
|
|
struct v4l2_flash *v4l2_flash = v4l2_subdev_to_v4l2_flash(sd);
|
|
struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
|
|
struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
|
|
struct led_classdev *led_cdev_ind = v4l2_flash->iled_cdev;
|
|
int ret = 0;
|
|
|
|
if (!v4l2_fh_is_singular(&fh->vfh))
|
|
return 0;
|
|
|
|
if (led_cdev) {
|
|
mutex_lock(&led_cdev->led_access);
|
|
|
|
led_sysfs_disable(led_cdev);
|
|
led_trigger_remove(led_cdev);
|
|
|
|
mutex_unlock(&led_cdev->led_access);
|
|
}
|
|
|
|
if (led_cdev_ind) {
|
|
mutex_lock(&led_cdev_ind->led_access);
|
|
|
|
led_sysfs_disable(led_cdev_ind);
|
|
led_trigger_remove(led_cdev_ind);
|
|
|
|
mutex_unlock(&led_cdev_ind->led_access);
|
|
}
|
|
|
|
ret = __sync_device_with_v4l2_controls(v4l2_flash);
|
|
if (ret < 0)
|
|
goto out_sync_device;
|
|
|
|
return 0;
|
|
out_sync_device:
|
|
if (led_cdev) {
|
|
mutex_lock(&led_cdev->led_access);
|
|
led_sysfs_enable(led_cdev);
|
|
mutex_unlock(&led_cdev->led_access);
|
|
}
|
|
|
|
if (led_cdev_ind) {
|
|
mutex_lock(&led_cdev_ind->led_access);
|
|
led_sysfs_enable(led_cdev_ind);
|
|
mutex_unlock(&led_cdev_ind->led_access);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int v4l2_flash_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
|
|
{
|
|
struct v4l2_flash *v4l2_flash = v4l2_subdev_to_v4l2_flash(sd);
|
|
struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
|
|
struct led_classdev *led_cdev = fled_cdev ? &fled_cdev->led_cdev : NULL;
|
|
struct led_classdev *led_cdev_ind = v4l2_flash->iled_cdev;
|
|
int ret = 0;
|
|
|
|
if (!v4l2_fh_is_singular(&fh->vfh))
|
|
return 0;
|
|
|
|
if (led_cdev) {
|
|
mutex_lock(&led_cdev->led_access);
|
|
|
|
if (v4l2_flash->ctrls[STROBE_SOURCE])
|
|
ret = v4l2_ctrl_s_ctrl(
|
|
v4l2_flash->ctrls[STROBE_SOURCE],
|
|
V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
|
|
led_sysfs_enable(led_cdev);
|
|
|
|
mutex_unlock(&led_cdev->led_access);
|
|
}
|
|
|
|
if (led_cdev_ind) {
|
|
mutex_lock(&led_cdev_ind->led_access);
|
|
led_sysfs_enable(led_cdev_ind);
|
|
mutex_unlock(&led_cdev_ind->led_access);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct v4l2_subdev_internal_ops v4l2_flash_subdev_internal_ops = {
|
|
.open = v4l2_flash_open,
|
|
.close = v4l2_flash_close,
|
|
};
|
|
|
|
static const struct v4l2_subdev_ops v4l2_flash_subdev_ops;
|
|
|
|
static struct v4l2_flash *__v4l2_flash_init(
|
|
struct device *dev, struct fwnode_handle *fwn,
|
|
struct led_classdev_flash *fled_cdev, struct led_classdev *iled_cdev,
|
|
const struct v4l2_flash_ops *ops, struct v4l2_flash_config *config)
|
|
{
|
|
struct v4l2_flash *v4l2_flash;
|
|
struct v4l2_subdev *sd;
|
|
int ret;
|
|
|
|
if (!config)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
v4l2_flash = devm_kzalloc(dev, sizeof(*v4l2_flash), GFP_KERNEL);
|
|
if (!v4l2_flash)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
sd = &v4l2_flash->sd;
|
|
v4l2_flash->fled_cdev = fled_cdev;
|
|
v4l2_flash->iled_cdev = iled_cdev;
|
|
v4l2_flash->ops = ops;
|
|
sd->dev = dev;
|
|
sd->fwnode = fwn ? fwn : dev_fwnode(dev);
|
|
v4l2_subdev_init(sd, &v4l2_flash_subdev_ops);
|
|
sd->internal_ops = &v4l2_flash_subdev_internal_ops;
|
|
sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
|
|
strscpy(sd->name, config->dev_name, sizeof(sd->name));
|
|
|
|
ret = media_entity_pads_init(&sd->entity, 0, NULL);
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
|
|
sd->entity.function = MEDIA_ENT_F_FLASH;
|
|
|
|
ret = v4l2_flash_init_controls(v4l2_flash, config);
|
|
if (ret < 0)
|
|
goto err_init_controls;
|
|
|
|
fwnode_handle_get(sd->fwnode);
|
|
|
|
ret = v4l2_async_register_subdev(sd);
|
|
if (ret < 0)
|
|
goto err_async_register_sd;
|
|
|
|
return v4l2_flash;
|
|
|
|
err_async_register_sd:
|
|
fwnode_handle_put(sd->fwnode);
|
|
v4l2_ctrl_handler_free(sd->ctrl_handler);
|
|
err_init_controls:
|
|
media_entity_cleanup(&sd->entity);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
struct v4l2_flash *v4l2_flash_init(
|
|
struct device *dev, struct fwnode_handle *fwn,
|
|
struct led_classdev_flash *fled_cdev,
|
|
const struct v4l2_flash_ops *ops,
|
|
struct v4l2_flash_config *config)
|
|
{
|
|
return __v4l2_flash_init(dev, fwn, fled_cdev, NULL, ops, config);
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_flash_init);
|
|
|
|
struct v4l2_flash *v4l2_flash_indicator_init(
|
|
struct device *dev, struct fwnode_handle *fwn,
|
|
struct led_classdev *iled_cdev,
|
|
struct v4l2_flash_config *config)
|
|
{
|
|
return __v4l2_flash_init(dev, fwn, NULL, iled_cdev, NULL, config);
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_flash_indicator_init);
|
|
|
|
void v4l2_flash_release(struct v4l2_flash *v4l2_flash)
|
|
{
|
|
struct v4l2_subdev *sd;
|
|
|
|
if (IS_ERR_OR_NULL(v4l2_flash))
|
|
return;
|
|
|
|
sd = &v4l2_flash->sd;
|
|
|
|
v4l2_async_unregister_subdev(sd);
|
|
|
|
fwnode_handle_put(sd->fwnode);
|
|
|
|
v4l2_ctrl_handler_free(sd->ctrl_handler);
|
|
media_entity_cleanup(&sd->entity);
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_flash_release);
|
|
|
|
MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
|
|
MODULE_DESCRIPTION("V4L2 Flash sub-device helpers");
|
|
MODULE_LICENSE("GPL v2");
|