From patchwork Thu Mar 12 15:45:13 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacek Anaszewski X-Patchwork-Id: 5996601 Return-Path: X-Original-To: patchwork-linux-media@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 709A1BF90F for ; Thu, 12 Mar 2015 15:47:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4867820272 for ; Thu, 12 Mar 2015 15:47:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C0BC62025A for ; Thu, 12 Mar 2015 15:47:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030356AbbCLPrK (ORCPT ); Thu, 12 Mar 2015 11:47:10 -0400 Received: from mailout4.samsung.com ([203.254.224.34]:26389 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030312AbbCLPrF (ORCPT ); Thu, 12 Mar 2015 11:47:05 -0400 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 <0NL3007I9VUF1D20@mailout4.samsung.com>; Fri, 13 Mar 2015 00:47:03 +0900 (KST) X-AuditID: cbfee61b-f79d76d0000024d6-95-5501b4f7b9c2 Received: from epmmp2 ( [203.254.227.17]) by epcpsbgm2.samsung.com (EPCPMTA) with SMTP id 5C.BD.09430.7F4B1055; Fri, 13 Mar 2015 00:47:03 +0900 (KST) Received: from AMDC2362.DIGITAL.local ([106.120.53.23]) by mmp2.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0NL300DC9VRGU950@mmp2.samsung.com>; Fri, 13 Mar 2015 00:47:03 +0900 (KST) From: Jacek Anaszewski To: linux-leds@vger.kernel.org, linux-media@vger.kernel.org, linux-kernel@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 Subject: [PATCH/RFC v13 12/13] leds: max77693: add support for V4L2 Flash sub-device Date: Thu, 12 Mar 2015 16:45:13 +0100 Message-id: <1426175114-14876-13-git-send-email-j.anaszewski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1426175114-14876-1-git-send-email-j.anaszewski@samsung.com> References: <1426175114-14876-1-git-send-email-j.anaszewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrLLMWRmVeSWpSXmKPExsVy+t9jQd3vWxhDDZ4tUrM4unMik8X8I+dY LXqvPme0ONv0ht3i8q45bBZb36xjtOjZsJXV4u6po2wWu3c9ZbU4/Kad1eLM/pVsDtweO2fd Zfc4/HUhi8ee+T9YPfq2rGL0WLH6O7vH501yAWxRXDYpqTmZZalF+nYJXBmLzlxmLFjoXrFu x1nmBsZu6y5GTg4JAROJs4uOMkHYYhIX7q1n62Lk4hASmM4ocXHVExYIp51JYuGBCYwgVWwC hhI/X7wG6xARKJfYc+cxO0gRs8AGRonLExpZQBLCAmES2z7/ZwaxWQRUJS7/ewjWwCvgKbHn YwdQAwfQOgWJOZNsQMKcQOHu+x/A5gsJeEhM3vCXfQIj7wJGhlWMoqkFyQXFSem5RnrFibnF pXnpesn5uZsYwYH4THoH46oGi0OMAhyMSjy8F74zhAqxJpYVV+YeYpTgYFYS4TWdzxgqxJuS WFmVWpQfX1Sak1p8iFGag0VJnFfJvi1ESCA9sSQ1OzW1ILUIJsvEwSnVwDgzP3jF9SNcW778 rNzRt/GGW1Tfw3Cm3E3fRJlqZQ7VpH06pVM1xTdf2rhwi1dL4wWtp4k3onelNdv87LzQ3rAn X25y/P236w8kfmu+Hrh4lemPw8yGSip8d2zCMtq3izK6TvdbGyLY56qY6sokVjxJYMbJovl5 3sqCN/6H7JcU3dlrUPDqmRJLcUaioRZzUXEiAGvxJ8NAAgAA 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 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 | 150 +++++++++++++++++++++++++++++++++++++++--- 1 file changed, 142 insertions(+), 8 deletions(-) diff --git a/drivers/leds/leds-max77693.c b/drivers/leds/leds-max77693.c index 6873611..ea782c0 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)) @@ -67,6 +68,8 @@ 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; @@ -650,7 +653,8 @@ static int max77693_led_flash_timeout_set( } static int max77693_led_parse_dt(struct max77693_led_device *led, - struct max77693_led_config_data *cfg) + struct max77693_led_config_data *cfg, + struct device_node **sub_nodes) { struct device *dev = &led->pdev->dev; struct max77693_sub_led *sub_leds = led->sub_leds; @@ -696,6 +700,13 @@ 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; of_property_read_string(child_node, "label", @@ -783,11 +794,12 @@ static void max77693_led_validate_configuration(struct max77693_led_device *led, } static int max77693_led_get_configuration(struct max77693_led_device *led, - struct max77693_led_config_data *cfg) + struct max77693_led_config_data *cfg, + struct device_node **sub_nodes) { int ret; - ret = max77693_led_parse_dt(led, cfg); + ret = max77693_led_parse_dt(led, cfg, sub_nodes); if (ret < 0) return ret; @@ -844,9 +856,87 @@ static void max77693_init_flash_settings(struct max77693_led_device *led, setting->val = setting->max; } +#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; +} + +static void max77693_init_v4l2_ctrl_config(struct max77693_led_device *led, + int fled_id, + struct max77693_led_settings *s, + struct v4l2_flash_ctrl_config *config) +{ + struct device *dev = &led->pdev->dev; + struct max77693_dev *iodev = dev_get_drvdata(dev->parent); + struct i2c_client *i2c = iodev->i2c; + struct led_flash_setting *setting; + struct v4l2_ctrl_config *c; + + snprintf(config->dev_name, sizeof(config->dev_name), + "%s %d-%04x", fled_id == FLED1 ? MAX77693_LED1_NAME : + MAX77693_LED2_NAME, + i2c_adapter_id(i2c->adapter), i2c->addr); + + 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; +} + +static const struct v4l2_flash_ops v4l2_flash_ops = { + .external_strobe_set = max77693_led_external_strobe_set, +}; + +#else +#define max77693_init_v4l2_ctrl_config(led, fled_id, s, config) +#endif + static void max77693_init_fled_cdev(struct max77693_led_device *led, int fled_id, - struct max77693_led_config_data *cfg) + struct max77693_led_config_data *cfg, + struct v4l2_flash_ctrl_config *v4l2_flash_cfg) { struct led_classdev_flash *fled_cdev; struct led_classdev *led_cdev; @@ -855,6 +945,8 @@ static void max77693_init_fled_cdev(struct max77693_led_device *led, /* Initialize flash settings */ max77693_init_flash_settings(led, fled_id, cfg, &settings); + /* Initialize V4L2 Flash config basing on initialized settings */ + max77693_init_v4l2_ctrl_config(led, fled_id, &settings, v4l2_flash_cfg); /* Initialize LED Flash class device */ fled_cdev = &sub_led->fled_cdev; @@ -881,15 +973,51 @@ 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; + + 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 max77693_led_config_data cfg = {}; + 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; @@ -900,7 +1028,7 @@ 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, &cfg); + ret = max77693_led_get_configuration(led, &cfg, sub_nodes); if (ret < 0) return ret; @@ -916,15 +1044,18 @@ 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, &cfg); + max77693_init_fled_cdev(led, i, &cfg, + &v4l2_flash_config[i]); 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]) continue; - 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 @@ -943,6 +1074,7 @@ 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); led_classdev_flash_unregister(&sub_leds[FLED1].fled_cdev); err_register_led1: mutex_destroy(&led->lock); @@ -956,11 +1088,13 @@ 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); 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); led_classdev_flash_unregister(&sub_leds[FLED2].fled_cdev); cancel_work_sync(&sub_leds[FLED2].work_brightness_set); }