From patchwork Wed Feb 18 16:20:37 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacek Anaszewski X-Patchwork-Id: 5845231 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 9F3639F373 for ; Wed, 18 Feb 2015 16:26:15 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id ADAC420256 for ; Wed, 18 Feb 2015 16:26:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7A28420225 for ; Wed, 18 Feb 2015 16:26:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753037AbbBRQ0I (ORCPT ); Wed, 18 Feb 2015 11:26:08 -0500 Received: from mailout4.samsung.com ([203.254.224.34]:62603 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753042AbbBRQ0G (ORCPT ); Wed, 18 Feb 2015 11:26:06 -0500 Received: from epcpsbgm2.samsung.com (epcpsbgm2 [203.254.230.27]) by mailout4.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NJZ00KG06ZHVV30@mailout4.samsung.com>; Thu, 19 Feb 2015 01:26:05 +0900 (KST) X-AuditID: cbfee61b-f79d76d0000024d6-ed-54e4bd1cd132 Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm2.samsung.com (EPCPMTA) with SMTP id D1.24.09430.C1DB4E45; Thu, 19 Feb 2015 01:26:05 +0900 (KST) Received: from AMDC2362.DIGITAL.local ([106.120.53.23]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0NJZ003WS6QJDJ20@mmp1.samsung.com>; Thu, 19 Feb 2015 01:26:04 +0900 (KST) From: Jacek Anaszewski To: linux-leds@vger.kernel.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org Cc: kyungmin.park@samsung.com, pavel@ucw.cz, cooloney@gmail.com, rpurdie@rpsys.net, sakari.ailus@iki.fi, s.nawrocki@samsung.com, Jacek Anaszewski , Hans Verkuil Subject: [PATCH/RFC v11 16/20] media: Add registration helpers for V4L2 flash sub-devices Date: Wed, 18 Feb 2015 17:20:37 +0100 Message-id: <1424276441-3969-17-git-send-email-j.anaszewski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1424276441-3969-1-git-send-email-j.anaszewski@samsung.com> References: <1424276441-3969-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrILMWRmVeSWpSXmKPExsVy+t9jAV3ZvU9CDC4lWxzdOZHJYv6Rc6wW S37uYrLovfqc0eJs0xt2i61v1jFa9GzYympx99RRNovdu56yWhx+085qcWb/SjYHbo8pvzey euycdZfd4/DXhSwee+b/YPXo27KK0WPF6u/sHp83yQWwR3HZpKTmZJalFunbJXBlbOm/zl4w /TJjRUvbIpYGxm/rGLsYOTkkBEwkPvYthLLFJC7cW8/WxcjFISSwiFFizpcNLBBOO5PEno1X mUGq2AQMJX6+eM0EYosIREq8O3qJGaSIWeAmo8S7t0vYuxg5OIQFoiUebvQCqWERUJW4NmE9 WC+vgIfEsUW3wUokBBQk5kyyATE5gcIXnnuAVAgJuEtMv/mOdQIj7wJGhlWMoqkFyQXFSem5 RnrFibnFpXnpesn5uZsYwQH5THoH46oGi0OMAhyMSjy8Db8fhwixJpYVV+YeYpTgYFYS4c1d +SREiDclsbIqtSg/vqg0J7X4EKM0B4uSOK+SfVuIkEB6YklqdmpqQWoRTJaJg1OqgdE64oJB xzFr82LuK9dqjCqWeok+YylatMBzx79p4T+eFFss9L8+f8XSqb2WP2tCHh4/sb5B7YFnxdun nPNnO7yxkz6qX+z8IewO68trs1WDdmkFqxz8t57dipFJ5sKzKQfWrV9i6PTivf7E5D6ThElb 317NyVQ615j9/cOhIF2uE3uj/hS/T0hRYinOSDTUYi4qTgQAXgsXbUQCAAA= Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Acked-by: Kyungmin Park Cc: Sakari Ailus Cc: Hans Verkuil --- drivers/media/v4l2-core/Kconfig | 11 + drivers/media/v4l2-core/Makefile | 2 + drivers/media/v4l2-core/v4l2-flash.c | 640 ++++++++++++++++++++++++++++++++++ include/media/v4l2-flash.h | 146 ++++++++ 4 files changed, 799 insertions(+) create mode 100644 drivers/media/v4l2-core/v4l2-flash.c create mode 100644 include/media/v4l2-flash.h diff --git a/drivers/media/v4l2-core/Kconfig b/drivers/media/v4l2-core/Kconfig index ba7e21a..f034f1a 100644 --- a/drivers/media/v4l2-core/Kconfig +++ b/drivers/media/v4l2-core/Kconfig @@ -44,6 +44,17 @@ config V4L2_MEM2MEM_DEV tristate depends on VIDEOBUF2_CORE +# Used by LED subsystem flash drivers +config V4L2_FLASH_LED_CLASS + tristate "Enable support for Flash sub-devices" + depends on VIDEO_V4L2_SUBDEV_API + depends on LEDS_CLASS_FLASH + ---help--- + Say Y here to enable support for Flash sub-devices, which allow + to control LED class devices with use of V4L2 Flash controls. + + When in doubt, say N. + # Used by drivers that need Videobuf modules config VIDEOBUF_GEN tristate diff --git a/drivers/media/v4l2-core/Makefile b/drivers/media/v4l2-core/Makefile index 63d29f2..44e858c 100644 --- a/drivers/media/v4l2-core/Makefile +++ b/drivers/media/v4l2-core/Makefile @@ -22,6 +22,8 @@ obj-$(CONFIG_VIDEO_TUNER) += tuner.o obj-$(CONFIG_V4L2_MEM2MEM_DEV) += v4l2-mem2mem.o +obj-$(CONFIG_V4L2_FLASH_LED_CLASS) += v4l2-flash.o + obj-$(CONFIG_VIDEOBUF_GEN) += videobuf-core.o obj-$(CONFIG_VIDEOBUF_DMA_SG) += videobuf-dma-sg.o obj-$(CONFIG_VIDEOBUF_DMA_CONTIG) += videobuf-dma-contig.o diff --git a/drivers/media/v4l2-core/v4l2-flash.c b/drivers/media/v4l2-core/v4l2-flash.c new file mode 100644 index 0000000..bb38216 --- /dev/null +++ b/drivers/media/v4l2-core/v4l2-flash.c @@ -0,0 +1,640 @@ +/* + * V4L2 Flash LED sub-device registration helpers. + * + * Copyright (C) 2015 Samsung Electronics Co., Ltd + * Author: Jacek Anaszewski + * + * 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. + */ + +#include +#include +#include +#include +#include +#include + +#define has_flash_op(v4l2_flash, op) \ + (v4l2_flash && v4l2_flash->ops->op) + +#define call_flash_op(v4l2_flash, op, arg) \ + (has_flash_op(v4l2_flash, op) ? \ + v4l2_flash->ops->op(v4l2_flash, arg) : \ + -EINVAL) + +static enum led_brightness __intensity_to_led_brightness( + struct v4l2_ctrl *ctrl, + s32 intensity) +{ + s64 intensity64 = intensity - ctrl->minimum; + + do_div(intensity64, ctrl->step); + + /* + * Indicator LEDs, unlike torch LEDs, are turned on/off basing on + * the state of V4L2_CID_FLASH_INDICATOR_INTENSITY control only. + * Therefore it must be possible to set it to 0 level which in + * the LED subsystem reflects LED_OFF state. + */ + if (ctrl->id != V4L2_CID_FLASH_INDICATOR_INTENSITY) + ++intensity64; + + return intensity64; +} + +static s32 __led_brightness_to_intensity(struct v4l2_ctrl *ctrl, + enum led_brightness brightness) +{ + /* + * Indicator LEDs, unlike torch LEDs, are turned on/off basing on + * the state of V4L2_CID_FLASH_INDICATOR_INTENSITY control only. + * Do not decrement brightness read from the LED subsystem for + * indicator LED as it may equal 0. For torch LEDs this function + * is called only when V4L2_FLASH_LED_MODE_TORCH is set and the + * brightness read is guaranteed to be greater than 0. In the mode + * V4L2_FLASH_LED_MODE_NONE the cached torch intensity value is used. + */ + if (ctrl->id != V4L2_CID_FLASH_INDICATOR_INTENSITY) + --brightness; + + return (brightness * ctrl->step) + ctrl->minimum; +} + +static void v4l2_flash_set_led_brightness(struct v4l2_flash *v4l2_flash, + struct v4l2_ctrl *ctrl) +{ + struct v4l2_ctrl **ctrls = v4l2_flash->ctrls; + enum led_brightness brightness; + + if (has_flash_op(v4l2_flash, intensity_to_led_brightness)) + brightness = call_flash_op(v4l2_flash, + intensity_to_led_brightness, + ctrl->val); + else + brightness = __intensity_to_led_brightness(ctrl, ctrl->val); + /* + * In case a LED Flash class driver provides ops for custom + * brightness <-> intensity conversion, it also must have defined + * related v4l2 control step == 1. In such a case a backward conversion + * from led brightness to v4l2 intensity is required to find out the + * the aligned intensity value. + */ + if (has_flash_op(v4l2_flash, led_brightness_to_intensity)) + ctrl->val = call_flash_op(v4l2_flash, + led_brightness_to_intensity, + brightness); + + if (ctrl == ctrls[TORCH_INTENSITY] && + ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH) + return; + + led_set_brightness(&v4l2_flash->fled_cdev->led_cdev, brightness); +} + +static int v4l2_flash_update_led_brightness(struct v4l2_flash *v4l2_flash, + struct v4l2_ctrl *ctrl) +{ + struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev; + struct led_classdev *led_cdev = &fled_cdev->led_cdev; + struct v4l2_ctrl **ctrls = v4l2_flash->ctrls; + int ret; + + /* + * Update torch brightness only if in TORCH_MODE. In other modes torch + * led is turned off, which would spuriously inform the user space that + * V4L2_CID_FLASH_TORCH_INTENSITY control value has changed to 0. + */ + if (ctrl == ctrls[TORCH_INTENSITY] && + ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH) + return 0; + + ret = led_update_brightness(led_cdev); + if (ret < 0) + return ret; + + if (has_flash_op(v4l2_flash, led_brightness_to_intensity)) + ctrl->val = call_flash_op(v4l2_flash, + led_brightness_to_intensity, + led_cdev->brightness); + else + ctrl->val = __led_brightness_to_intensity(ctrl, + led_cdev->brightness); + + return 0; +} + +static int v4l2_flash_g_volatile_ctrl(struct v4l2_ctrl *c) +{ + struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c); + struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev; + bool is_strobing; + int ret; + + switch (c->id) { + case V4L2_CID_FLASH_TORCH_INTENSITY: + case V4L2_CID_FLASH_INDICATOR_INTENSITY: + return v4l2_flash_update_led_brightness(v4l2_flash, c); + case V4L2_CID_FLASH_INTENSITY: + ret = led_update_flash_brightness(fled_cdev); + if (ret < 0) + return ret; + /* no conversion is needed */ + c->val = fled_cdev->brightness.val; + return 0; + case V4L2_CID_FLASH_STROBE_STATUS: + ret = led_get_flash_strobe(fled_cdev, &is_strobing); + if (ret < 0) + return ret; + c->val = is_strobing; + return 0; + case V4L2_CID_FLASH_FAULT: + /* LED faults map directly to V4L2 flash faults */ + return led_get_flash_fault(fled_cdev, &c->val); + default: + return -EINVAL; + } +} + +static bool __software_strobe_mode_inactive(struct v4l2_ctrl **ctrls) +{ + return ((ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_FLASH) || + (ctrls[STROBE_SOURCE] && (ctrls[STROBE_SOURCE]->val != + V4L2_FLASH_STROBE_SOURCE_SOFTWARE))); +} + +static int v4l2_flash_s_ctrl(struct v4l2_ctrl *c) +{ + struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c); + struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev; + struct led_classdev *led_cdev = &fled_cdev->led_cdev; + struct v4l2_ctrl **ctrls = v4l2_flash->ctrls; + bool external_strobe; + int ret = 0; + + switch (c->id) { + case V4L2_CID_FLASH_LED_MODE: + switch (c->val) { + case V4L2_FLASH_LED_MODE_NONE: + led_set_brightness(led_cdev, LED_OFF); + return led_set_flash_strobe(fled_cdev, false); + case V4L2_FLASH_LED_MODE_FLASH: + /* Turn the torch LED off */ + led_set_brightness(led_cdev, LED_OFF); + if (ctrls[STROBE_SOURCE]) { + external_strobe = (ctrls[STROBE_SOURCE]->val == + V4L2_FLASH_STROBE_SOURCE_EXTERNAL); + + ret = call_flash_op(v4l2_flash, + external_strobe_set, + external_strobe); + } + return ret; + case V4L2_FLASH_LED_MODE_TORCH: + if (ctrls[STROBE_SOURCE]) { + ret = call_flash_op(v4l2_flash, + external_strobe_set, + false); + if (ret < 0) + return ret; + } + /* Stop flash strobing */ + ret = led_set_flash_strobe(fled_cdev, false); + if (ret < 0) + return ret; + + v4l2_flash_set_led_brightness(v4l2_flash, + ctrls[TORCH_INTENSITY]); + return 0; + } + break; + case V4L2_CID_FLASH_STROBE_SOURCE: + external_strobe = (c->val == V4L2_FLASH_STROBE_SOURCE_EXTERNAL); + /* + * For some hardware arrangements setting external flash strobe + * may spuriously turn the torch mode off. Therefore cache only + * this settting in such a case and apply it while switching to + * the torch mode. + */ + if ((ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_FLASH) && + external_strobe) + return 0; + + return call_flash_op(v4l2_flash, external_strobe_set, + external_strobe); + case V4L2_CID_FLASH_STROBE: + if (__software_strobe_mode_inactive(ctrls)) + return -EBUSY; + return led_set_flash_strobe(fled_cdev, true); + case V4L2_CID_FLASH_STROBE_STOP: + if (__software_strobe_mode_inactive(ctrls)) + return -EBUSY; + return led_set_flash_strobe(fled_cdev, false); + case V4L2_CID_FLASH_TIMEOUT: + /* no conversion is needed */ + return led_set_flash_timeout(fled_cdev, c->val); + case V4L2_CID_FLASH_INTENSITY: + /* no conversion is needed */ + return led_set_flash_brightness(fled_cdev, c->val); + case V4L2_CID_FLASH_TORCH_INTENSITY: + case V4L2_CID_FLASH_INDICATOR_INTENSITY: + v4l2_flash_set_led_brightness(v4l2_flash, c); + return 0; + case V4L2_CID_FLASH_SYNC_STROBE: + fled_cdev->sync_led_id = c->val; + return 0; + } + + return -EINVAL; +} + +static const struct v4l2_ctrl_ops v4l2_flash_ctrl_ops = { + .g_volatile_ctrl = v4l2_flash_g_volatile_ctrl, + .s_ctrl = v4l2_flash_s_ctrl, +}; + +static void fill_ctrl_init_data(struct v4l2_flash *v4l2_flash, + struct v4l2_flash_ctrl_config *flash_ctrl_cfg, + struct v4l2_flash_ctrl_data *ctrl_init_data) +{ + struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev; + const struct led_flash_ops *fled_cdev_ops = fled_cdev->ops; + struct led_classdev *led_cdev = &fled_cdev->led_cdev; + struct v4l2_ctrl_config *ctrl_cfg; + u32 mask; + + /* Init FLASH_FAULT ctrl data */ + if (flash_ctrl_cfg->flash_faults) { + ctrl_init_data[FLASH_FAULT].cid = V4L2_CID_FLASH_FAULT; + ctrl_cfg = &ctrl_init_data[FLASH_FAULT].config; + ctrl_cfg->id = V4L2_CID_FLASH_FAULT; + ctrl_cfg->max = flash_ctrl_cfg->flash_faults; + ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE | + V4L2_CTRL_FLAG_READ_ONLY; + } + + /* Init INDICATOR_INTENSITY ctrl data */ + if (flash_ctrl_cfg->indicator_led) { + ctrl_init_data[INDICATOR_INTENSITY].cid = + V4L2_CID_FLASH_INDICATOR_INTENSITY; + ctrl_init_data[INDICATOR_INTENSITY].config = + flash_ctrl_cfg->intensity; + ctrl_cfg = &ctrl_init_data[INDICATOR_INTENSITY].config; + ctrl_cfg->id = V4L2_CID_FLASH_INDICATOR_INTENSITY; + ctrl_cfg->min = 0; + ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE; + + /* Indicator LED can have only faults and intensity controls. */ + return; + } + + /* Init FLASH_LED_MODE ctrl data */ + mask = 1 << V4L2_FLASH_LED_MODE_NONE | + 1 << V4L2_FLASH_LED_MODE_TORCH; + if (led_cdev->flags & LED_DEV_CAP_FLASH) + mask |= 1 << V4L2_FLASH_LED_MODE_FLASH; + + ctrl_init_data[LED_MODE].cid = V4L2_CID_FLASH_LED_MODE; + ctrl_cfg = &ctrl_init_data[LED_MODE].config; + ctrl_cfg->id = V4L2_CID_FLASH_LED_MODE; + ctrl_cfg->max = V4L2_FLASH_LED_MODE_TORCH; + ctrl_cfg->menu_skip_mask = ~mask; + ctrl_cfg->def = V4L2_FLASH_LED_MODE_NONE; + ctrl_cfg->flags = 0; + + /* Init TORCH_INTENSITY ctrl data */ + ctrl_init_data[TORCH_INTENSITY].cid = V4L2_CID_FLASH_TORCH_INTENSITY; + ctrl_init_data[TORCH_INTENSITY].config = flash_ctrl_cfg->intensity; + ctrl_cfg = &ctrl_init_data[TORCH_INTENSITY].config; + ctrl_cfg->id = V4L2_CID_FLASH_TORCH_INTENSITY; + ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE; + + if (!(led_cdev->flags & LED_DEV_CAP_FLASH)) + return; + + /* Init FLASH_STROBE ctrl data */ + ctrl_init_data[FLASH_STROBE].cid = V4L2_CID_FLASH_STROBE; + ctrl_cfg = &ctrl_init_data[FLASH_STROBE].config; + ctrl_cfg->id = V4L2_CID_FLASH_STROBE; + + /* Init STROBE_STOP ctrl data */ + ctrl_init_data[STROBE_STOP].cid = V4L2_CID_FLASH_STROBE_STOP; + ctrl_cfg = &ctrl_init_data[STROBE_STOP].config; + ctrl_cfg->id = V4L2_CID_FLASH_STROBE_STOP; + + /* Init FLASH_STROBE_SOURCE ctrl data */ + if (flash_ctrl_cfg->has_external_strobe) { + mask = (1 << V4L2_FLASH_STROBE_SOURCE_SOFTWARE) | + (1 << V4L2_FLASH_STROBE_SOURCE_EXTERNAL); + ctrl_init_data[STROBE_SOURCE].cid = + V4L2_CID_FLASH_STROBE_SOURCE; + ctrl_cfg = &ctrl_init_data[STROBE_SOURCE].config; + 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_init_data[FLASH_TIMEOUT].config = + flash_ctrl_cfg->flash_timeout; + ctrl_cfg = &ctrl_init_data[FLASH_TIMEOUT].config; + ctrl_cfg->id = V4L2_CID_FLASH_TIMEOUT; + ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE; + } + + /* Init FLASH_INTENSITY ctrl data */ + if (fled_cdev_ops->flash_brightness_set) { + ctrl_init_data[FLASH_INTENSITY].cid = V4L2_CID_FLASH_INTENSITY; + ctrl_init_data[FLASH_INTENSITY].config = + flash_ctrl_cfg->flash_intensity; + ctrl_cfg = &ctrl_init_data[FLASH_INTENSITY].config; + ctrl_cfg->id = V4L2_CID_FLASH_INTENSITY; + ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE; + } +} + +static int v4l2_flash_init_sync_strobe_menu(struct v4l2_flash *v4l2_flash) +{ + struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev; + struct v4l2_ctrl *ctrl; + int i = 0; + + v4l2_flash->sync_strobe_menu = + devm_kcalloc(fled_cdev->led_cdev.dev->parent, + fled_cdev->num_sync_leds + 1, + sizeof(char *), + GFP_KERNEL); + + if (!v4l2_flash->sync_strobe_menu) + return -ENOMEM; + + v4l2_flash->sync_strobe_menu[0] = "none"; + + for (i = 0; i < fled_cdev->num_sync_leds; ++i) + v4l2_flash->sync_strobe_menu[i + 1] = + (char *) fled_cdev->sync_leds[i]->led_cdev.name; + + ctrl = v4l2_ctrl_new_std_menu_items( + &v4l2_flash->hdl, &v4l2_flash_ctrl_ops, + V4L2_CID_FLASH_SYNC_STROBE, + fled_cdev->num_sync_leds, + 0, 0, + (const char * const *) v4l2_flash->sync_strobe_menu); + + return 0; +} + +static int v4l2_flash_init_controls(struct v4l2_flash *v4l2_flash, + struct v4l2_flash_ctrl_config *flash_ctrl_cfg) + +{ + struct led_classdev *led_cdev = &v4l2_flash->fled_cdev->led_cdev; + struct v4l2_flash_ctrl_data *ctrl_init_data; + struct v4l2_ctrl *ctrl; + struct v4l2_ctrl_config *ctrl_cfg; + int i, ret, num_ctrls = 0; + + /* 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_ctrl_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 <= SYNC_STROBE) + v4l2_flash->ctrls[i] = ctrl; + } + + kfree(ctrl_init_data); + + if (led_cdev->flags & LED_DEV_CAP_SYNC_STROBE) { + ret = v4l2_flash_init_sync_strobe_menu(v4l2_flash); + if (ret < 0) + goto error_free_handler; + } + + 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[SYNC_STROBE]) + fled_cdev->sync_led_id = ctrls[SYNC_STROBE]->val; + + 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; + } + + if (ctrls[STROBE_SOURCE]) + ret = call_flash_op(v4l2_flash, external_strobe_set, false); + + if (ctrls[INDICATOR_INTENSITY]) + v4l2_flash_set_led_brightness(v4l2_flash, + ctrls[INDICATOR_INTENSITY]); + else + v4l2_flash_set_led_brightness(v4l2_flash, + ctrls[TORCH_INTENSITY]); + + 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; + int ret = 0; + + mutex_lock(&led_cdev->led_access); + + if (!v4l2_fh_is_singular(&fh->vfh)) { + ret = -EBUSY; + goto unlock; + } + + led_sysfs_disable(led_cdev); + + ret = __sync_device_with_v4l2_controls(v4l2_flash); + +unlock: + mutex_unlock(&led_cdev->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; + int ret = 0; + + mutex_lock(&led_cdev->led_access); + + if (v4l2_flash->ctrls[STROBE_SOURCE]) + 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); + + 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 led_classdev_flash *fled_cdev, + const struct v4l2_flash_ops *ops, + struct v4l2_flash_ctrl_config *config) +{ + struct v4l2_flash *v4l2_flash; + struct led_classdev *led_cdev = &fled_cdev->led_cdev; + struct v4l2_subdev *sd; + int ret; + + if (!fled_cdev || !ops || !config) + return ERR_PTR(-EINVAL); + + 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->ops = ops; + sd->dev = led_cdev->dev; + 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, led_cdev->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) + return ERR_PTR(ret); + + ret = v4l2_async_register_subdev(sd); + if (ret < 0) + goto err_async_register_sd; + + return v4l2_flash; + +err_async_register_sd: + media_entity_cleanup(&sd->entity); + v4l2_ctrl_handler_free(sd->ctrl_handler); + + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(v4l2_flash_init); + +void v4l2_flash_release(struct v4l2_flash *v4l2_flash) +{ + struct v4l2_subdev *sd = &v4l2_flash->sd; + + if (!v4l2_flash) + return; + + v4l2_async_unregister_subdev(sd); + v4l2_ctrl_handler_free(sd->ctrl_handler); + media_entity_cleanup(&sd->entity); +} +EXPORT_SYMBOL_GPL(v4l2_flash_release); + +MODULE_AUTHOR("Jacek Anaszewski "); +MODULE_DESCRIPTION("V4L2 Flash sub-device helpers"); +MODULE_LICENSE("GPL v2"); diff --git a/include/media/v4l2-flash.h b/include/media/v4l2-flash.h new file mode 100644 index 0000000..e0d58cf --- /dev/null +++ b/include/media/v4l2-flash.h @@ -0,0 +1,146 @@ +/* + * V4L2 Flash LED sub-device registration helpers. + * + * Copyright (C) 2015 Samsung Electronics Co., Ltd + * Author: Jacek Anaszewski + * + * 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 +#include + +struct led_classdev_flash; +struct led_classdev; +struct v4l2_flash; +enum led_brightness; + +enum ctrl_init_data_id { + LED_MODE, + TORCH_INTENSITY, + FLASH_INTENSITY, + INDICATOR_INTENSITY, + FLASH_TIMEOUT, + STROBE_SOURCE, + SYNC_STROBE, + /* + * Only above values are applicable to + * the 'ctrls' array in the struct v4l2_flash. + */ + FLASH_STROBE, + STROBE_STOP, + STROBE_STATUS, + FLASH_FAULT, + NUM_FLASH_CTRLS, +}; + +/* + * 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_ctrl_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_ctrl_config - V4L2 Flash controls initialization data + * @intensity: constraints for the led in a non-flash mode + * @flash_intensity: V4L2_CID_FLASH_INTENSITY settings constraints + * @flash_timeout: V4L2_CID_FLASH_TIMEOUT constraints + * @flash_faults: possible flash faults + * @has_external_strobe: external strobe capability + * @indicator_led: signifies that a led is of indicator type + */ +struct v4l2_flash_ctrl_config { + struct v4l2_ctrl_config intensity; + struct v4l2_ctrl_config flash_intensity; + struct v4l2_ctrl_config flash_timeout; + u32 flash_faults; + bool has_external_strobe:1; + bool indicator_led:1; +}; + +/** + * struct v4l2_flash - Flash sub-device context + * @fled_cdev: LED Flash class device controlled by this sub-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 + * @sync_strobe_menu leds available for flash strobe synchronization + */ +struct v4l2_flash { + struct led_classdev_flash *fled_cdev; + const struct v4l2_flash_ops *ops; + + struct v4l2_subdev sd; + struct v4l2_ctrl_handler hdl; + struct v4l2_ctrl *ctrls[SYNC_STROBE + 1]; + char **sync_strobe_menu; +}; + +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 + * @fled_cdev: the LED Flash class device to wrap + * @flash_ops: V4L2 Flash device ops + * @config: initialization data for V4L2 Flash controls + * + * 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 led_classdev_flash *fled_cdev, + const struct v4l2_flash_ops *ops, + struct v4l2_flash_ctrl_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 +#define v4l2_flash_init(fled_cdev, ops, config) (NULL) +#define v4l2_flash_release(v4l2_flash) +#endif /* CONFIG_V4L2_FLASH_LED_CLASS */ + +#endif /* _V4L2_FLASH_H */