From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933601AbbCDQRZ (ORCPT ); Wed, 4 Mar 2015 11:17:25 -0500 Received: from mailout2.samsung.com ([203.254.224.25]:13763 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933527AbbCDQRU (ORCPT ); Wed, 4 Mar 2015 11:17:20 -0500 X-AuditID: cbfee61b-f79d76d0000024d6-a2-54f7300e80fd From: Jacek Anaszewski To: linux-leds@vger.kernel.org, linux-media@vger.kernel.org Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, kyungmin.park@samsung.com, pavel@ucw.cz, cooloney@gmail.com, rpurdie@rpsys.net, sakari.ailus@iki.fi, s.nawrocki@samsung.com, Jacek Anaszewski , Sakari Ailus Subject: [PATCH/RFC v12 19/19] leds: aat1290: add support for V4L2 Flash sub-device Date: Wed, 04 Mar 2015 17:14:40 +0100 Message-id: <1425485680-8417-20-git-send-email-j.anaszewski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1425485680-8417-1-git-send-email-j.anaszewski@samsung.com> References: <1425485680-8417-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrKLMWRmVeSWpSXmKPExsVy+t9jAV0+g+8hBrvPyFkc3TmRyWL+kXOs Fr1XnzNanG16w25xedccNoutb9YxWvRs2MpqcffUUTaL3bueslocftPOanFm/0o2i09bvjE5 8HjsnHWX3ePw14UsHvNOBnrsmf+D1aNvyypGjxWrv7N7fN4kF8AexWWTkpqTWZZapG+XwJXx tvcjY8FFl4pZd1azNjB+sehi5OSQEDCReLvmORuELSZx4d56MFtIYBGjxJnrMl2MXEB2O5PE 4e2bGEESbAKGEj9fvGYCsUUErCVmHZrOAlLELDCbSaKx4RVYt7BAqMSTZW1gDSwCqhIfXj9l BrF5BTwkzm/qBIpzAG1TkJgzyQYkzAkUPntzPRPEYneJww/3s0xg5F3AyLCKUTS1ILmgOCk9 10ivODG3uDQvXS85P3cTIzgwn0nvYFzVYHGIUYCDUYmH90DstxAh1sSy4srcQ4wSHMxKIrzP 2b6HCPGmJFZWpRblxxeV5qQWH2KU5mBREudVsm8LERJITyxJzU5NLUgtgskycXBKNTBO033p unWXgrF9CHOjxKGYT++3vDsZfzuOc5usU/aN/EvKPKcuvvKK2FS0N9WtebXUjJr2krbf7OKv uj9xuN/KP/+FY9Wd2HKGuxuiUt/MXzvfK3NJ1hX/Hq//nM75DxRqS/gN2PoKSxTeOr20r6hf cFC2s+moh8QcY9WUX2mJa9jW2vJIBymxFGckGmoxFxUnAgAD5PFvSAIAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add support for V4L2 Flash sub-device to the aat1290 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/Kconfig | 1 + drivers/leds/leds-aat1290.c | 165 ++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 164 insertions(+), 2 deletions(-) diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 6e141d6..986876e 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -46,6 +46,7 @@ config LEDS_AAT1290 tristate "LED support for the AAT1290" depends on LEDS_CLASS_FLASH depends on OF + depends on PINCTRL help This option enables support for the LEDs on the AAT1290. diff --git a/drivers/leds/leds-aat1290.c b/drivers/leds/leds-aat1290.c index 1c2d490..7e6b5d8 100644 --- a/drivers/leds/leds-aat1290.c +++ b/drivers/leds/leds-aat1290.c @@ -18,8 +18,10 @@ #include #include #include +#include #include #include +#include #include #define AAT1290_MOVIE_MODE_CURRENT_ADDR 17 @@ -60,11 +62,17 @@ struct aat1290_led { /* related LED Flash class device */ struct led_classdev_flash fled_cdev; + /* V4L2 Flash device */ + struct v4l2_flash *v4l2_flash; /* FLEN pin */ int flen_gpio; /* EN|SET pin */ int en_set_gpio; +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) + /* movie mode current scale */ + int *mm_current_scale; +#endif /* maximum flash timeout */ u32 max_flash_tm; @@ -234,10 +242,12 @@ static int aat1290_led_flash_timeout_set(struct led_classdev_flash *fled_cdev, static int aat1290_led_parse_dt(struct aat1290_led *led, struct device *dev, - const char **led_label) + const char **led_label, + struct v4l2_flash_ctrl_config *config) { struct device_node *node = dev->of_node, *child_node; int flen_gpio, enset_gpio, cnt_leds = 0, ret; + struct pinctrl *pinctrl; flen_gpio = of_get_gpio(node, 0); if (gpio_is_valid(flen_gpio)) { @@ -269,6 +279,17 @@ static int aat1290_led_parse_dt(struct aat1290_led *led, } led->en_set_gpio = enset_gpio; +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) + pinctrl = devm_pinctrl_get_select_default(&led->pdev->dev); + if (IS_ERR(pinctrl)) { + config->has_external_strobe = false; + dev_info(dev, + "No support for external strobe source detected.\n"); + } else { + config->has_external_strobe = true; + } +#endif + for_each_available_child_of_node(node, child_node) { ret = of_property_read_string(child_node, "label", (const char **) led_label); @@ -312,6 +333,15 @@ static void aat1290_init_flash_settings(struct aat1290_led *led, { struct led_flash_setting *setting; +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) + /* Init flash intensity setting */ + setting = &s->torch_brightness; + setting->min = led->mm_current_scale[0]; + setting->max = led->mm_current_scale[AAT1290_MM_CURRENT_SCALE_SIZE - 1]; + setting->step = 1; + setting->val = setting->max; +#endif + /* Init flash timeout setting */ setting = &s->flash_timeout; setting->min = led->max_flash_tm / AAT1290_FLASH_TM_NUM_LEVELS; @@ -320,6 +350,101 @@ static void aat1290_init_flash_settings(struct aat1290_led *led, setting->val = setting->max; } +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) +enum led_brightness aat1290_intensity_to_brightness( + struct v4l2_flash *v4l2_flash, + s32 intensity) +{ + struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev; + struct aat1290_led *led = fled_cdev_to_led(fled_cdev); + int i; + + for (i = AAT1290_MM_CURRENT_SCALE_SIZE - 1; i >= 0; --i) + if (intensity >= led->mm_current_scale[i]) + return i + 1; + + return 1; +} + +s32 aat1290_brightness_to_intensity(struct v4l2_flash *v4l2_flash, + enum led_brightness brightness) +{ + struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev; + struct aat1290_led *led = fled_cdev_to_led(fled_cdev); + + return led->mm_current_scale[brightness - 1]; +} + +static int aat1290_led_external_strobe_set(struct v4l2_flash *v4l2_flash, + bool enable) +{ + struct aat1290_led *led = fled_cdev_to_led(v4l2_flash->fled_cdev); + struct pinctrl *pinctrl; + + led->movie_mode = false; + gpio_set_value(led->flen_gpio, 0); + gpio_set_value(led->en_set_gpio, 0); + pinctrl = devm_pinctrl_get_select(&led->pdev->dev, + enable ? "isp" : "host"); + if (IS_ERR(pinctrl)) { + dev_warn(&led->pdev->dev, "Unable to switch strobe source.\n"); + return PTR_ERR(pinctrl); + } + + return 0; +} + +int init_mm_current_scale(struct aat1290_led *led) +{ + int max_mm_current_percent[] = { 20, 22, 25, 28, 32, 36, 40, 45, 50, 56, + 63, 71, 79, 89, 100 }; + int i, max_mm_current = AAT1290_MAX_MM_CURRENT(led->max_flash_current); + + led->mm_current_scale = devm_kzalloc(&led->pdev->dev, + sizeof(max_mm_current_percent), + GFP_KERNEL); + if (!led->mm_current_scale) + return -ENOMEM; + + for (i = 0; i < AAT1290_MM_CURRENT_SCALE_SIZE; ++i) + led->mm_current_scale[i] = max_mm_current * + max_mm_current_percent[i] / 100; + + return 0; +} + +static void aat1290_init_v4l2_ctrl_config(struct aat1290_led *led, + struct aat1290_led_settings *s, + struct v4l2_flash_ctrl_config *config) +{ + 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_timeout; + setting = &s->flash_timeout; + c->min = setting->min; + c->max = setting->max; + c->step = setting->step; + c->def = setting->val; +} + +static const struct v4l2_flash_ops v4l2_flash_ops = { + .external_strobe_set = aat1290_led_external_strobe_set, + .intensity_to_led_brightness = aat1290_intensity_to_brightness, + .led_brightness_to_intensity = aat1290_brightness_to_intensity, +}; +#else +#define aat1290_init_v4l2_ctrl_config(led, s, config) +#define init_mm_current_scale(led) (0) +#endif + static const struct led_flash_ops flash_ops = { .strobe_set = aat1290_led_flash_strobe_set, .timeout_set = aat1290_led_flash_timeout_set, @@ -332,6 +457,9 @@ static int aat1290_led_probe(struct platform_device *pdev) struct aat1290_led *led; struct led_classdev *led_cdev; struct led_classdev_flash *fled_cdev; +#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) + struct v4l2_flash_ctrl_config v4l2_flash_config = {}; +#endif struct aat1290_led_settings settings; int ret; @@ -348,13 +476,25 @@ static int aat1290_led_probe(struct platform_device *pdev) fled_cdev = &led->fled_cdev; led_cdev = &fled_cdev->led_cdev; - ret = aat1290_led_parse_dt(led, &pdev->dev, &led_cdev->name); + ret = aat1290_led_parse_dt(led, &pdev->dev, &led_cdev->name, + &v4l2_flash_config); + if (ret < 0) + return ret; + + /* + * Initialize non-linear movie mode current scale basing + * on the max flash current from Device Tree binding. + */ + ret = init_mm_current_scale(led); if (ret < 0) return ret; /* Init flash settings */ aat1290_init_flash_settings(led, &settings); + /* Init V4L2 Flash controls basing on initialized settings */ + aat1290_init_v4l2_ctrl_config(led, &settings, &v4l2_flash_config); + fled_cdev->timeout = settings.flash_timeout; fled_cdev->ops = &flash_ops; @@ -373,13 +513,34 @@ static int aat1290_led_probe(struct platform_device *pdev) mutex_init(&led->lock); + of_node_get(dev_node); + led_cdev->dev->of_node = dev_node; + + /* Create V4L2 Flash subdev. */ + led->v4l2_flash = v4l2_flash_init(fled_cdev, + &v4l2_flash_ops, + &v4l2_flash_config); + if (IS_ERR(led->v4l2_flash)) { + ret = PTR_ERR(led->v4l2_flash); + goto error_v4l2_flash_init; + } + return 0; + +error_v4l2_flash_init: + of_node_put(dev_node); + led_classdev_flash_unregister(fled_cdev); + mutex_destroy(&led->lock); + + return ret; } static int aat1290_led_remove(struct platform_device *pdev) { struct aat1290_led *led = platform_get_drvdata(pdev); + v4l2_flash_release(led->v4l2_flash); + of_node_put(led->fled_cdev.led_cdev.dev->of_node); led_classdev_flash_unregister(&led->fled_cdev); cancel_work_sync(&led->work_brightness_set); -- 1.7.9.5