media: Add registration helpers for V4L2 flash sub-devices
This patch adds helper functions for registering/unregistering LED Flash class devices as V4L2 sub-devices. The functions should be called from the LED subsystem device driver. In case the support for V4L2 Flash sub-devices is disabled in the kernel config the functions' empty versions will be used. Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com> Acked-by: Kyungmin Park <kyungmin.park@samsung.com> Cc: Sakari Ailus <sakari.ailus@iki.fi> Cc: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Jacek Anaszewski
Bryan Wu
parent
862176512b
commit
42bd6f59ae
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@ -44,6 +44,17 @@ config V4L2_MEM2MEM_DEV
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tristate
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depends on VIDEOBUF2_CORE
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# Used by LED subsystem flash drivers
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config V4L2_FLASH_LED_CLASS
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tristate "V4L2 flash API for LED flash class devices"
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depends on VIDEO_V4L2_SUBDEV_API
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depends on LEDS_CLASS_FLASH
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---help---
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Say Y here to enable V4L2 flash API support for LED flash
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class drivers.
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When in doubt, say N.
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# Used by drivers that need Videobuf modules
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config VIDEOBUF_GEN
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tristate
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@ -22,6 +22,8 @@ obj-$(CONFIG_VIDEO_TUNER) += tuner.o
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obj-$(CONFIG_V4L2_MEM2MEM_DEV) += v4l2-mem2mem.o
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obj-$(CONFIG_V4L2_FLASH_LED_CLASS) += v4l2-flash-led-class.o
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obj-$(CONFIG_VIDEOBUF_GEN) += videobuf-core.o
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obj-$(CONFIG_VIDEOBUF_DMA_SG) += videobuf-dma-sg.o
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obj-$(CONFIG_VIDEOBUF_DMA_CONTIG) += videobuf-dma-contig.o
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@ -0,0 +1,710 @@
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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/of.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->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 void 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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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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* the 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;
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led_set_brightness(&v4l2_flash->fled_cdev->led_cdev,
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brightness);
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} else {
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led_set_brightness(&v4l2_flash->iled_cdev->led_cdev,
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brightness);
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}
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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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led_cdev = &v4l2_flash->fled_cdev->led_cdev;
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} else {
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led_cdev = &v4l2_flash->iled_cdev->led_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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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 = &fled_cdev->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_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(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(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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v4l2_flash_set_led_brightness(v4l2_flash,
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ctrls[TORCH_INTENSITY]);
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return 0;
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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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case V4L2_CID_FLASH_TORCH_INTENSITY:
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case V4L2_CID_FLASH_INDICATOR_INTENSITY:
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v4l2_flash_set_led_brightness(v4l2_flash, c);
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return 0;
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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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const struct led_flash_ops *fled_cdev_ops = fled_cdev->ops;
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struct led_classdev *led_cdev = &fled_cdev->led_cdev;
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struct v4l2_ctrl_config *ctrl_cfg;
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u32 mask;
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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->torch_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 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->indicator_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->flags & LED_DEV_CAP_FLASH))
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return;
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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;
|
||||
ctrl_cfg->max = V4L2_FLASH_STROBE_SOURCE_EXTERNAL;
|
||||
ctrl_cfg->menu_skip_mask = ~mask;
|
||||
ctrl_cfg->def = V4L2_FLASH_STROBE_SOURCE_SOFTWARE;
|
||||
}
|
||||
|
||||
/* Init STROBE_STATUS ctrl data */
|
||||
if (fled_cdev_ops->strobe_get) {
|
||||
ctrl_init_data[STROBE_STATUS].cid =
|
||||
V4L2_CID_FLASH_STROBE_STATUS;
|
||||
ctrl_cfg = &ctrl_init_data[STROBE_STATUS].config;
|
||||
ctrl_cfg->id = V4L2_CID_FLASH_STROBE_STATUS;
|
||||
ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
|
||||
V4L2_CTRL_FLAG_READ_ONLY;
|
||||
}
|
||||
|
||||
/* Init FLASH_TIMEOUT ctrl data */
|
||||
if (fled_cdev_ops->timeout_set) {
|
||||
ctrl_init_data[FLASH_TIMEOUT].cid = V4L2_CID_FLASH_TIMEOUT;
|
||||
ctrl_cfg = &ctrl_init_data[FLASH_TIMEOUT].config;
|
||||
__lfs_to_v4l2_ctrl_config(&fled_cdev->timeout, ctrl_cfg);
|
||||
ctrl_cfg->id = V4L2_CID_FLASH_TIMEOUT;
|
||||
}
|
||||
|
||||
/* Init FLASH_INTENSITY ctrl data */
|
||||
if (fled_cdev_ops->flash_brightness_set) {
|
||||
ctrl_init_data[FLASH_INTENSITY].cid = V4L2_CID_FLASH_INTENSITY;
|
||||
ctrl_cfg = &ctrl_init_data[FLASH_INTENSITY].config;
|
||||
__lfs_to_v4l2_ctrl_config(&fled_cdev->brightness, ctrl_cfg);
|
||||
ctrl_cfg->id = V4L2_CID_FLASH_INTENSITY;
|
||||
ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
|
||||
V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
|
||||
}
|
||||
}
|
||||
|
||||
static int v4l2_flash_init_controls(struct v4l2_flash *v4l2_flash,
|
||||
struct v4l2_flash_config *flash_cfg)
|
||||
|
||||
{
|
||||
struct v4l2_flash_ctrl_data *ctrl_init_data;
|
||||
struct v4l2_ctrl *ctrl;
|
||||
struct v4l2_ctrl_config *ctrl_cfg;
|
||||
int i, ret, num_ctrls = 0;
|
||||
|
||||
v4l2_flash->ctrls = devm_kzalloc(v4l2_flash->sd.dev,
|
||||
sizeof(*v4l2_flash->ctrls) *
|
||||
(STROBE_SOURCE + 1), 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;
|
||||
|
||||
v4l2_flash_set_led_brightness(v4l2_flash, ctrls[TORCH_INTENSITY]);
|
||||
|
||||
if (ctrls[INDICATOR_INTENSITY])
|
||||
v4l2_flash_set_led_brightness(v4l2_flash,
|
||||
ctrls[INDICATOR_INTENSITY]);
|
||||
|
||||
if (ctrls[FLASH_TIMEOUT]) {
|
||||
ret = led_set_flash_timeout(fled_cdev,
|
||||
ctrls[FLASH_TIMEOUT]->val);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (ctrls[FLASH_INTENSITY]) {
|
||||
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->led_cdev;
|
||||
struct led_classdev_flash *iled_cdev = v4l2_flash->iled_cdev;
|
||||
struct led_classdev *led_cdev_ind = NULL;
|
||||
int ret = 0;
|
||||
|
||||
if (!v4l2_fh_is_singular(&fh->vfh))
|
||||
return 0;
|
||||
|
||||
mutex_lock(&led_cdev->led_access);
|
||||
|
||||
led_sysfs_disable(led_cdev);
|
||||
led_trigger_remove(led_cdev);
|
||||
|
||||
mutex_unlock(&led_cdev->led_access);
|
||||
|
||||
if (iled_cdev) {
|
||||
led_cdev_ind = &iled_cdev->led_cdev;
|
||||
|
||||
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:
|
||||
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->led_cdev;
|
||||
struct led_classdev_flash *iled_cdev = v4l2_flash->iled_cdev;
|
||||
int ret = 0;
|
||||
|
||||
if (!v4l2_fh_is_singular(&fh->vfh))
|
||||
return 0;
|
||||
|
||||
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 (iled_cdev) {
|
||||
struct led_classdev *led_cdev_ind = &iled_cdev->led_cdev;
|
||||
|
||||
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_core_ops v4l2_flash_core_ops = {
|
||||
.queryctrl = v4l2_subdev_queryctrl,
|
||||
.querymenu = v4l2_subdev_querymenu,
|
||||
};
|
||||
|
||||
static const struct v4l2_subdev_ops v4l2_flash_subdev_ops = {
|
||||
.core = &v4l2_flash_core_ops,
|
||||
};
|
||||
|
||||
struct v4l2_flash *v4l2_flash_init(
|
||||
struct device *dev, struct device_node *of_node,
|
||||
struct led_classdev_flash *fled_cdev,
|
||||
struct led_classdev_flash *iled_cdev,
|
||||
const struct v4l2_flash_ops *ops,
|
||||
struct v4l2_flash_config *config)
|
||||
{
|
||||
struct v4l2_flash *v4l2_flash;
|
||||
struct led_classdev *led_cdev;
|
||||
struct v4l2_subdev *sd;
|
||||
int ret;
|
||||
|
||||
if (!fled_cdev || !ops || !config)
|
||||
return ERR_PTR(-EINVAL);
|
||||
|
||||
led_cdev = &fled_cdev->led_cdev;
|
||||
|
||||
v4l2_flash = devm_kzalloc(led_cdev->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->of_node = of_node;
|
||||
v4l2_subdev_init(sd, &v4l2_flash_subdev_ops);
|
||||
sd->internal_ops = &v4l2_flash_subdev_internal_ops;
|
||||
sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
|
||||
strlcpy(sd->name, config->dev_name, sizeof(sd->name));
|
||||
|
||||
ret = media_entity_init(&sd->entity, 0, NULL, 0);
|
||||
if (ret < 0)
|
||||
return ERR_PTR(ret);
|
||||
|
||||
sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
|
||||
|
||||
ret = v4l2_flash_init_controls(v4l2_flash, config);
|
||||
if (ret < 0)
|
||||
goto err_init_controls;
|
||||
|
||||
if (sd->of_node)
|
||||
of_node_get(sd->of_node);
|
||||
else
|
||||
of_node_get(led_cdev->dev->of_node);
|
||||
|
||||
ret = v4l2_async_register_subdev(sd);
|
||||
if (ret < 0)
|
||||
goto err_async_register_sd;
|
||||
|
||||
return v4l2_flash;
|
||||
|
||||
err_async_register_sd:
|
||||
of_node_put(led_cdev->dev->of_node);
|
||||
v4l2_ctrl_handler_free(sd->ctrl_handler);
|
||||
err_init_controls:
|
||||
media_entity_cleanup(&sd->entity);
|
||||
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(v4l2_flash_init);
|
||||
|
||||
void v4l2_flash_release(struct v4l2_flash *v4l2_flash)
|
||||
{
|
||||
struct v4l2_subdev *sd;
|
||||
struct led_classdev *led_cdev;
|
||||
|
||||
if (IS_ERR_OR_NULL(v4l2_flash))
|
||||
return;
|
||||
|
||||
sd = &v4l2_flash->sd;
|
||||
led_cdev = &v4l2_flash->fled_cdev->led_cdev;
|
||||
|
||||
v4l2_async_unregister_subdev(sd);
|
||||
|
||||
if (sd->of_node)
|
||||
of_node_put(sd->of_node);
|
||||
else
|
||||
of_node_put(led_cdev->dev->of_node);
|
||||
|
||||
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");
|
||||
|
|
@ -0,0 +1,148 @@
|
|||
/*
|
||||
* V4L2 flash LED sub-device registration helpers.
|
||||
*
|
||||
* Copyright (C) 2015 Samsung Electronics Co., Ltd
|
||||
* Author: Jacek Anaszewski <j.anaszewski@samsung.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifndef _V4L2_FLASH_H
|
||||
#define _V4L2_FLASH_H
|
||||
|
||||
#include <media/v4l2-ctrls.h>
|
||||
#include <media/v4l2-subdev.h>
|
||||
|
||||
struct led_classdev_flash;
|
||||
struct led_classdev;
|
||||
struct v4l2_flash;
|
||||
enum led_brightness;
|
||||
|
||||
/*
|
||||
* struct v4l2_flash_ctrl_data - flash control initialization data, filled
|
||||
* basing on the features declared by the LED flash
|
||||
* class driver in the v4l2_flash_config
|
||||
* @config: initialization data for a control
|
||||
* @cid: contains v4l2 flash control id if the config
|
||||
* field was initialized, 0 otherwise
|
||||
*/
|
||||
struct v4l2_flash_ctrl_data {
|
||||
struct v4l2_ctrl_config config;
|
||||
u32 cid;
|
||||
};
|
||||
|
||||
struct v4l2_flash_ops {
|
||||
/* setup strobing the flash by hardware pin state assertion */
|
||||
int (*external_strobe_set)(struct v4l2_flash *v4l2_flash,
|
||||
bool enable);
|
||||
/* convert intensity to brightness in a device specific manner */
|
||||
enum led_brightness (*intensity_to_led_brightness)
|
||||
(struct v4l2_flash *v4l2_flash, s32 intensity);
|
||||
/* convert brightness to intensity in a device specific manner */
|
||||
s32 (*led_brightness_to_intensity)
|
||||
(struct v4l2_flash *v4l2_flash, enum led_brightness);
|
||||
};
|
||||
|
||||
/**
|
||||
* struct v4l2_flash_config - V4L2 Flash sub-device initialization data
|
||||
* @dev_name: the name of the media entity,
|
||||
unique in the system
|
||||
* @torch_intensity: constraints for the LED in torch mode
|
||||
* @indicator_intensity: constraints for the indicator LED
|
||||
* @flash_faults: bitmask of flash faults that the LED flash class
|
||||
device can report; corresponding LED_FAULT* bit
|
||||
definitions are available in the header file
|
||||
<linux/led-class-flash.h>
|
||||
* @has_external_strobe: external strobe capability
|
||||
*/
|
||||
struct v4l2_flash_config {
|
||||
char dev_name[32];
|
||||
struct led_flash_setting torch_intensity;
|
||||
struct led_flash_setting indicator_intensity;
|
||||
u32 flash_faults;
|
||||
unsigned int has_external_strobe:1;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct v4l2_flash - Flash sub-device context
|
||||
* @fled_cdev: LED flash class device controlled by this sub-device
|
||||
* @iled_cdev: LED class device representing indicator LED associated
|
||||
* with the LED flash class device
|
||||
* @ops: V4L2 specific flash ops
|
||||
* @sd: V4L2 sub-device
|
||||
* @hdl: flash controls handler
|
||||
* @ctrls: array of pointers to controls, whose values define
|
||||
* the sub-device state
|
||||
*/
|
||||
struct v4l2_flash {
|
||||
struct led_classdev_flash *fled_cdev;
|
||||
struct led_classdev_flash *iled_cdev;
|
||||
const struct v4l2_flash_ops *ops;
|
||||
|
||||
struct v4l2_subdev sd;
|
||||
struct v4l2_ctrl_handler hdl;
|
||||
struct v4l2_ctrl **ctrls;
|
||||
};
|
||||
|
||||
static inline struct v4l2_flash *v4l2_subdev_to_v4l2_flash(
|
||||
struct v4l2_subdev *sd)
|
||||
{
|
||||
return container_of(sd, struct v4l2_flash, sd);
|
||||
}
|
||||
|
||||
static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c)
|
||||
{
|
||||
return container_of(c->handler, struct v4l2_flash, hdl);
|
||||
}
|
||||
|
||||
#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
|
||||
/**
|
||||
* v4l2_flash_init - initialize V4L2 flash led sub-device
|
||||
* @dev: flash device, e.g. an I2C device
|
||||
* @of_node: of_node of the LED, may be NULL if the same as device's
|
||||
* @fled_cdev: LED flash class device to wrap
|
||||
* @iled_cdev: LED flash class device representing indicator LED associated
|
||||
* with fled_cdev, may be NULL
|
||||
* @flash_ops: V4L2 Flash device ops
|
||||
* @config: initialization data for V4L2 Flash sub-device
|
||||
*
|
||||
* Create V4L2 Flash sub-device wrapping given LED subsystem device.
|
||||
*
|
||||
* Returns: A valid pointer, or, when an error occurs, the return
|
||||
* value is encoded using ERR_PTR(). Use IS_ERR() to check and
|
||||
* PTR_ERR() to obtain the numeric return value.
|
||||
*/
|
||||
struct v4l2_flash *v4l2_flash_init(
|
||||
struct device *dev, struct device_node *of_node,
|
||||
struct led_classdev_flash *fled_cdev,
|
||||
struct led_classdev_flash *iled_cdev,
|
||||
const struct v4l2_flash_ops *ops,
|
||||
struct v4l2_flash_config *config);
|
||||
|
||||
/**
|
||||
* v4l2_flash_release - release V4L2 Flash sub-device
|
||||
* @flash: the V4L2 Flash sub-device to release
|
||||
*
|
||||
* Release V4L2 Flash sub-device.
|
||||
*/
|
||||
void v4l2_flash_release(struct v4l2_flash *v4l2_flash);
|
||||
|
||||
#else
|
||||
static inline struct v4l2_flash *v4l2_flash_init(
|
||||
struct device *dev, struct device_node *of_node,
|
||||
struct led_classdev_flash *fled_cdev,
|
||||
struct led_classdev_flash *iled_cdev,
|
||||
const struct v4l2_flash_ops *ops,
|
||||
struct v4l2_flash_config *config)
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
static inline void v4l2_flash_release(struct v4l2_flash *v4l2_flash)
|
||||
{
|
||||
}
|
||||
#endif /* CONFIG_V4L2_FLASH_LED_CLASS */
|
||||
|
||||
#endif /* _V4L2_FLASH_H */
|
||||
Loading…
Reference in New Issue