From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jacek Anaszewski Subject: [PATCH/RFC v10 18/19] leds: max77693: add support for V4L2 Flash sub-device Date: Fri, 09 Jan 2015 16:23:08 +0100 Message-ID: <1420816989-1808-19-git-send-email-j.anaszewski@samsung.com> References: <1420816989-1808-1-git-send-email-j.anaszewski@samsung.com> Return-path: Received: from mailout1.samsung.com ([203.254.224.24]:24643 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757843AbbAIPZI (ORCPT ); Fri, 9 Jan 2015 10:25:08 -0500 In-reply-to: <1420816989-1808-1-git-send-email-j.anaszewski@samsung.com> Sender: linux-leds-owner@vger.kernel.org List-Id: linux-leds@vger.kernel.org To: linux-leds@vger.kernel.org, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Cc: devicetree@vger.kernel.org, kyungmin.park@samsung.com, b.zolnierkie@samsung.com, pavel@ucw.cz, cooloney@gmail.com, rpurdie@rpsys.net, sakari.ailus@iki.fi, s.nawrocki@samsung.com, Jacek Anaszewski , Sakari Ailus Add support for V4L2 Flash sub-device to the max77693 LED Flash class driver. The support allows for V4L2 Flash sub-device to take the control of the LED Flash class device. Signed-off-by: Jacek Anaszewski Acked-by: Kyungmin Park Cc: Bryan Wu Cc: Richard Purdie Cc: Sakari Ailus --- drivers/leds/leds-max77693.c | 151 +++++++++++++++++++++++++++++++++++++++--- 1 file changed, 142 insertions(+), 9 deletions(-) diff --git a/drivers/leds/leds-max77693.c b/drivers/leds/leds-max77693.c index 3ba07c4..ef35abb 100644 --- a/drivers/leds/leds-max77693.c +++ b/drivers/leds/leds-max77693.c @@ -21,6 +21,7 @@ #include #include #include +#include #define MODE_OFF 0 #define MODE_FLASH(a) (1 << (a)) @@ -52,6 +53,8 @@ struct max77693_sub_led { struct led_classdev_flash fled_cdev; /* assures led-triggers compatibility */ struct work_struct work_brightness_set; + /* V4L2 Flash device */ + struct v4l2_flash *v4l2_flash; /* brightness cache */ unsigned int torch_brightness; @@ -624,6 +627,32 @@ unlock: return ret; } +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) +static int max77693_led_external_strobe_set( + struct v4l2_flash *v4l2_flash, + bool enable) +{ + struct max77693_sub_led *sub_led = + flcdev_to_sub_led(v4l2_flash->fled_cdev); + struct max77693_led_device *led = sub_led_to_led(sub_led); + int fled_id = sub_led->fled_id; + int ret; + + mutex_lock(&led->lock); + + if (enable) + ret = max77693_add_mode(led, MODE_FLASH_EXTERNAL(fled_id)); + else + ret = max77693_clear_mode(led, MODE_FLASH_EXTERNAL(fled_id)); + + mutex_unlock(&led->lock); + + return ret; +} +#else +#define max77693_led_external_strobe_set(v4l2_flash, enable) (NULL) +#endif + static int max77693_led_flash_fault_get( struct led_classdev_flash *fled_cdev, u32 *fault) @@ -689,7 +718,8 @@ static int max77693_led_flash_timeout_set( } static int max77693_led_parse_dt(struct max77693_led_device *led, - struct device_node *node) + struct device_node *node, + struct device_node **sub_nodes) { struct max77693_led_config_data *cfg = led->cfg_data; struct max77693_sub_led *sub_leds = led->sub_leds; @@ -727,6 +757,13 @@ static int max77693_led_parse_dt(struct max77693_led_device *led, return -EINVAL; } + if (sub_nodes[fled_id]) { + dev_err(dev, + "Conflicting \"led-sources\" DT properties\n"); + return -EINVAL; + } + + sub_nodes[fled_id] = child_node; sub_leds[fled_id].fled_id = fled_id; ret = of_property_read_string(child_node, "label", @@ -812,7 +849,8 @@ static void max77693_led_validate_configuration(struct max77693_led_device *led) MAX_FLASH1_VSYS_MAX, MAX_FLASH1_VSYS_STEP); } -static int max77693_led_get_configuration(struct max77693_led_device *led) +static int max77693_led_get_configuration(struct max77693_led_device *led, + struct device_node **sub_nodes) { struct device *dev = &led->pdev->dev; int ret; @@ -824,7 +862,7 @@ static int max77693_led_get_configuration(struct max77693_led_device *led) if (!led->cfg_data) return -ENOMEM; - ret = max77693_led_parse_dt(led, dev->of_node); + ret = max77693_led_parse_dt(led, dev->of_node, sub_nodes); if (ret < 0) return ret; @@ -841,6 +879,12 @@ static const struct led_flash_ops flash_ops = { .fault_get = max77693_led_flash_fault_get, }; +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) +static const struct v4l2_flash_ops v4l2_flash_ops = { + .external_strobe_set = max77693_led_external_strobe_set, +}; +#endif + static void max77693_init_flash_settings(struct max77693_led_device *led, struct max77693_led_settings *s, int fled_id) @@ -875,6 +919,47 @@ static void max77693_init_flash_settings(struct max77693_led_device *led, setting->val = setting->max; } +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) +static void max77693_init_v4l2_ctrl_config(struct max77693_led_settings *s, + struct max77693_led_config_data *p, + struct v4l2_flash_ctrl_config *config, + int fled_id) +{ + struct led_flash_setting *setting; + struct v4l2_ctrl_config *c; + + c = &config->intensity; + setting = &s->torch_brightness; + c->min = setting->min; + c->max = setting->max; + c->step = setting->step; + c->def = setting->val; + + c = &config->flash_intensity; + setting = &s->flash_brightness; + c->min = setting->min; + c->max = setting->max; + c->step = setting->step; + c->def = setting->val; + + c = &config->flash_timeout; + setting = &s->flash_timeout; + c->min = setting->min; + c->max = setting->max; + c->step = setting->step; + c->def = setting->val; + + /* Init flash faults config */ + config->flash_faults = V4L2_FLASH_FAULT_OVER_VOLTAGE | + V4L2_FLASH_FAULT_SHORT_CIRCUIT | + V4L2_FLASH_FAULT_OVER_CURRENT; + + config->has_external_strobe = true; +} +#else +#define max77693_init_v4l2_ctrl_config(s, p, config, fled_id) +#endif + static int max77693_set_available_sync_led(struct max77693_led_device *led, int fled_id) { @@ -893,7 +978,8 @@ static int max77693_set_available_sync_led(struct max77693_led_device *led, } static void max77693_init_fled_cdev(struct max77693_led_device *led, - int fled_id) + int fled_id, + struct v4l2_flash_ctrl_config *v4l2_flash_cfg) { struct led_classdev_flash *fled_cdev; struct led_classdev *led_cdev; @@ -902,6 +988,9 @@ static void max77693_init_fled_cdev(struct max77693_led_device *led, /* Initialize flash settings */ max77693_init_flash_settings(led, &settings, fled_id); + /* Initialize V4L2 Flash config basing on initialized settings */ + max77693_init_v4l2_ctrl_config(&settings, led->cfg_data, + v4l2_flash_cfg, fled_id); /* Initialize LED Flash class device */ fled_cdev = &sub_led->fled_cdev; @@ -924,14 +1013,51 @@ static void max77693_init_fled_cdev(struct max77693_led_device *led, sub_led->flash_timeout = fled_cdev->timeout.val; } +static int max77693_register_led(struct max77693_sub_led *sub_led, + struct v4l2_flash_ctrl_config *v4l2_flash_cfg, + struct device_node *sub_node) +{ + struct max77693_led_device *led = sub_led_to_led(sub_led); + struct led_classdev_flash *fled_cdev = &sub_led->fled_cdev; + struct device *dev = &led->pdev->dev; + int ret; + + /* Register in the LED subsystem */ + ret = led_classdev_flash_register(dev, fled_cdev); + if (ret < 0) + return ret; + + of_node_get(sub_node); + fled_cdev->led_cdev.dev->of_node = sub_node; + + /* Register in the V4L2 subsystem. */ + sub_led->v4l2_flash = v4l2_flash_init(fled_cdev, &v4l2_flash_ops, + v4l2_flash_cfg); + if (IS_ERR(sub_led->v4l2_flash)) { + ret = PTR_ERR(sub_led->v4l2_flash); + goto err_v4l2_flash_init; + } + + return 0; + +err_v4l2_flash_init: + of_node_put(sub_node); + led_classdev_flash_unregister(fled_cdev); + return ret; +} + static int max77693_led_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct max77693_dev *iodev = dev_get_drvdata(dev->parent); struct max77693_led_device *led; struct max77693_sub_led *sub_leds; + struct device_node *sub_nodes[2] = { NULL, NULL }; + struct v4l2_flash_ctrl_config v4l2_flash_config[2]; int init_fled_cdev[2], i, ret; + memset(v4l2_flash_config, 0, sizeof(v4l2_flash_config)); + led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL); if (!led) return -ENOMEM; @@ -941,7 +1067,7 @@ static int max77693_led_probe(struct platform_device *pdev) sub_leds = led->sub_leds; platform_set_drvdata(pdev, led); - ret = max77693_led_get_configuration(led); + ret = max77693_led_get_configuration(led, sub_nodes); if (ret < 0) return ret; @@ -957,7 +1083,7 @@ static int max77693_led_probe(struct platform_device *pdev) /* Initialize LED Flash class device(s) */ for (i = FLED1; i <= FLED2; ++i) if (init_fled_cdev[i]) - max77693_init_fled_cdev(led, i); + max77693_init_fled_cdev(led, i, &v4l2_flash_config[i]); /* Setup sub-leds available for flash strobe synchronization */ if (led->cfg_data->num_leds == 2) { @@ -970,11 +1096,12 @@ static int max77693_led_probe(struct platform_device *pdev) mutex_init(&led->lock); - /* Register LED Flash class device(s) */ + /* Register LED Flash class and related V4L2 Flash device(s) */ for (i = FLED1; i <= FLED2; ++i) { if (init_fled_cdev[i]) { - ret = led_classdev_flash_register(dev, - &sub_leds[i].fled_cdev); + ret = max77693_register_led(&sub_leds[i], + &v4l2_flash_config[i], + sub_nodes[i]); if (ret < 0) { /* * At this moment FLED1 might have been already @@ -995,6 +1122,8 @@ err_register_led2: /* It is possible than only FLED2 was to be registered */ if (!init_fled_cdev[FLED1]) goto err_register_led1; + v4l2_flash_release(sub_leds[FLED1].v4l2_flash); + of_node_put(sub_leds[FLED1].fled_cdev.led_cdev.dev->of_node); led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev); err_register_led1: mutex_destroy(&led->lock); @@ -1008,11 +1137,15 @@ static int max77693_led_remove(struct platform_device *pdev) struct max77693_sub_led *sub_leds = led->sub_leds; if (led->iout_joint || max77693_fled_used(led, FLED1)) { + v4l2_flash_release(sub_leds[FLED1].v4l2_flash); + of_node_put(sub_leds[FLED1].fled_cdev.led_cdev.dev->of_node); led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev); cancel_work_sync(&sub_leds[FLED1].work_brightness_set); } if (!led->iout_joint && max77693_fled_used(led, FLED2)) { + v4l2_flash_release(sub_leds[FLED2].v4l2_flash); + of_node_put(sub_leds[FLED2].fled_cdev.led_cdev.dev->of_node); led_classdev_flash_unregister(&sub_leds[FLED2].fled_cdev); cancel_work_sync(&sub_leds[FLED2].work_brightness_set); } -- 1.7.9.5