19a7c066fSLinus Walleij // SPDX-License-Identifier: GPL-2.0 29a7c066fSLinus Walleij // Copyright (C) 2020 Luca Weiss <luca@z3ntu.xyz> 39a7c066fSLinus Walleij 49a7c066fSLinus Walleij #include <linux/gpio/consumer.h> 59a7c066fSLinus Walleij #include <linux/led-class-flash.h> 69a7c066fSLinus Walleij #include <linux/module.h> 79a7c066fSLinus Walleij #include <linux/regulator/consumer.h> 89a7c066fSLinus Walleij #include <linux/platform_device.h> 99a7c066fSLinus Walleij 109a7c066fSLinus Walleij #include <media/v4l2-flash-led-class.h> 119a7c066fSLinus Walleij 129a7c066fSLinus Walleij #define FLASH_TIMEOUT_DEFAULT 250000U /* 250ms */ 139a7c066fSLinus Walleij #define FLASH_MAX_TIMEOUT_DEFAULT 300000U /* 300ms */ 149a7c066fSLinus Walleij 159a7c066fSLinus Walleij struct sgm3140 { 169a7c066fSLinus Walleij struct led_classdev_flash fled_cdev; 179a7c066fSLinus Walleij struct v4l2_flash *v4l2_flash; 189a7c066fSLinus Walleij 199a7c066fSLinus Walleij struct timer_list powerdown_timer; 209a7c066fSLinus Walleij 219a7c066fSLinus Walleij struct gpio_desc *flash_gpio; 229a7c066fSLinus Walleij struct gpio_desc *enable_gpio; 239a7c066fSLinus Walleij struct regulator *vin_regulator; 249a7c066fSLinus Walleij 259a7c066fSLinus Walleij bool enabled; 269a7c066fSLinus Walleij 279a7c066fSLinus Walleij /* current timeout in us */ 289a7c066fSLinus Walleij u32 timeout; 299a7c066fSLinus Walleij /* maximum timeout in us */ 309a7c066fSLinus Walleij u32 max_timeout; 319a7c066fSLinus Walleij }; 329a7c066fSLinus Walleij 339a7c066fSLinus Walleij static struct sgm3140 *flcdev_to_sgm3140(struct led_classdev_flash *flcdev) 349a7c066fSLinus Walleij { 359a7c066fSLinus Walleij return container_of(flcdev, struct sgm3140, fled_cdev); 369a7c066fSLinus Walleij } 379a7c066fSLinus Walleij 389a7c066fSLinus Walleij static int sgm3140_strobe_set(struct led_classdev_flash *fled_cdev, bool state) 399a7c066fSLinus Walleij { 409a7c066fSLinus Walleij struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev); 419a7c066fSLinus Walleij int ret; 429a7c066fSLinus Walleij 439a7c066fSLinus Walleij if (priv->enabled == state) 449a7c066fSLinus Walleij return 0; 459a7c066fSLinus Walleij 469a7c066fSLinus Walleij if (state) { 479a7c066fSLinus Walleij ret = regulator_enable(priv->vin_regulator); 489a7c066fSLinus Walleij if (ret) { 499a7c066fSLinus Walleij dev_err(fled_cdev->led_cdev.dev, 509a7c066fSLinus Walleij "failed to enable regulator: %d\n", ret); 519a7c066fSLinus Walleij return ret; 529a7c066fSLinus Walleij } 539a7c066fSLinus Walleij gpiod_set_value_cansleep(priv->flash_gpio, 1); 549a7c066fSLinus Walleij gpiod_set_value_cansleep(priv->enable_gpio, 1); 559a7c066fSLinus Walleij mod_timer(&priv->powerdown_timer, 569a7c066fSLinus Walleij jiffies + usecs_to_jiffies(priv->timeout)); 579a7c066fSLinus Walleij } else { 589a7c066fSLinus Walleij del_timer_sync(&priv->powerdown_timer); 599a7c066fSLinus Walleij gpiod_set_value_cansleep(priv->enable_gpio, 0); 609a7c066fSLinus Walleij gpiod_set_value_cansleep(priv->flash_gpio, 0); 619a7c066fSLinus Walleij ret = regulator_disable(priv->vin_regulator); 629a7c066fSLinus Walleij if (ret) { 639a7c066fSLinus Walleij dev_err(fled_cdev->led_cdev.dev, 649a7c066fSLinus Walleij "failed to disable regulator: %d\n", ret); 659a7c066fSLinus Walleij return ret; 669a7c066fSLinus Walleij } 679a7c066fSLinus Walleij } 689a7c066fSLinus Walleij 699a7c066fSLinus Walleij priv->enabled = state; 709a7c066fSLinus Walleij 719a7c066fSLinus Walleij return 0; 729a7c066fSLinus Walleij } 739a7c066fSLinus Walleij 749a7c066fSLinus Walleij static int sgm3140_strobe_get(struct led_classdev_flash *fled_cdev, bool *state) 759a7c066fSLinus Walleij { 769a7c066fSLinus Walleij struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev); 779a7c066fSLinus Walleij 789a7c066fSLinus Walleij *state = timer_pending(&priv->powerdown_timer); 799a7c066fSLinus Walleij 809a7c066fSLinus Walleij return 0; 819a7c066fSLinus Walleij } 829a7c066fSLinus Walleij 839a7c066fSLinus Walleij static int sgm3140_timeout_set(struct led_classdev_flash *fled_cdev, 849a7c066fSLinus Walleij u32 timeout) 859a7c066fSLinus Walleij { 869a7c066fSLinus Walleij struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev); 879a7c066fSLinus Walleij 889a7c066fSLinus Walleij priv->timeout = timeout; 899a7c066fSLinus Walleij 909a7c066fSLinus Walleij return 0; 919a7c066fSLinus Walleij } 929a7c066fSLinus Walleij 939a7c066fSLinus Walleij static const struct led_flash_ops sgm3140_flash_ops = { 949a7c066fSLinus Walleij .strobe_set = sgm3140_strobe_set, 959a7c066fSLinus Walleij .strobe_get = sgm3140_strobe_get, 969a7c066fSLinus Walleij .timeout_set = sgm3140_timeout_set, 979a7c066fSLinus Walleij }; 989a7c066fSLinus Walleij 999a7c066fSLinus Walleij static int sgm3140_brightness_set(struct led_classdev *led_cdev, 1009a7c066fSLinus Walleij enum led_brightness brightness) 1019a7c066fSLinus Walleij { 1029a7c066fSLinus Walleij struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(led_cdev); 1039a7c066fSLinus Walleij struct sgm3140 *priv = flcdev_to_sgm3140(fled_cdev); 1049a7c066fSLinus Walleij bool enable = brightness == LED_ON; 1059a7c066fSLinus Walleij int ret; 1069a7c066fSLinus Walleij 1079a7c066fSLinus Walleij if (priv->enabled == enable) 1089a7c066fSLinus Walleij return 0; 1099a7c066fSLinus Walleij 1109a7c066fSLinus Walleij if (enable) { 1119a7c066fSLinus Walleij ret = regulator_enable(priv->vin_regulator); 1129a7c066fSLinus Walleij if (ret) { 1139a7c066fSLinus Walleij dev_err(led_cdev->dev, 1149a7c066fSLinus Walleij "failed to enable regulator: %d\n", ret); 1159a7c066fSLinus Walleij return ret; 1169a7c066fSLinus Walleij } 1179a7c066fSLinus Walleij gpiod_set_value_cansleep(priv->enable_gpio, 1); 1189a7c066fSLinus Walleij } else { 1199a7c066fSLinus Walleij gpiod_set_value_cansleep(priv->enable_gpio, 0); 1209a7c066fSLinus Walleij ret = regulator_disable(priv->vin_regulator); 1219a7c066fSLinus Walleij if (ret) { 1229a7c066fSLinus Walleij dev_err(led_cdev->dev, 1239a7c066fSLinus Walleij "failed to disable regulator: %d\n", ret); 1249a7c066fSLinus Walleij return ret; 1259a7c066fSLinus Walleij } 1269a7c066fSLinus Walleij } 1279a7c066fSLinus Walleij 1289a7c066fSLinus Walleij priv->enabled = enable; 1299a7c066fSLinus Walleij 1309a7c066fSLinus Walleij return 0; 1319a7c066fSLinus Walleij } 1329a7c066fSLinus Walleij 1339a7c066fSLinus Walleij static void sgm3140_powerdown_timer(struct timer_list *t) 1349a7c066fSLinus Walleij { 1359a7c066fSLinus Walleij struct sgm3140 *priv = from_timer(priv, t, powerdown_timer); 1369a7c066fSLinus Walleij 1379a7c066fSLinus Walleij gpiod_set_value(priv->enable_gpio, 0); 1389a7c066fSLinus Walleij gpiod_set_value(priv->flash_gpio, 0); 1399a7c066fSLinus Walleij regulator_disable(priv->vin_regulator); 1409a7c066fSLinus Walleij 1419a7c066fSLinus Walleij priv->enabled = false; 1429a7c066fSLinus Walleij } 1439a7c066fSLinus Walleij 1449a7c066fSLinus Walleij static void sgm3140_init_flash_timeout(struct sgm3140 *priv) 1459a7c066fSLinus Walleij { 1469a7c066fSLinus Walleij struct led_classdev_flash *fled_cdev = &priv->fled_cdev; 1479a7c066fSLinus Walleij struct led_flash_setting *s; 1489a7c066fSLinus Walleij 1499a7c066fSLinus Walleij /* Init flash timeout setting */ 1509a7c066fSLinus Walleij s = &fled_cdev->timeout; 1519a7c066fSLinus Walleij s->min = 1; 1529a7c066fSLinus Walleij s->max = priv->max_timeout; 1539a7c066fSLinus Walleij s->step = 1; 1549a7c066fSLinus Walleij s->val = FLASH_TIMEOUT_DEFAULT; 1559a7c066fSLinus Walleij } 1569a7c066fSLinus Walleij 1579a7c066fSLinus Walleij #if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) 1589a7c066fSLinus Walleij static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv, 1599a7c066fSLinus Walleij struct v4l2_flash_config *v4l2_sd_cfg) 1609a7c066fSLinus Walleij { 1619a7c066fSLinus Walleij struct led_classdev *led_cdev = &priv->fled_cdev.led_cdev; 1629a7c066fSLinus Walleij struct led_flash_setting *s; 1639a7c066fSLinus Walleij 1649a7c066fSLinus Walleij strscpy(v4l2_sd_cfg->dev_name, led_cdev->dev->kobj.name, 1659a7c066fSLinus Walleij sizeof(v4l2_sd_cfg->dev_name)); 1669a7c066fSLinus Walleij 1679a7c066fSLinus Walleij /* Init flash intensity setting */ 1689a7c066fSLinus Walleij s = &v4l2_sd_cfg->intensity; 1699a7c066fSLinus Walleij s->min = 0; 1709a7c066fSLinus Walleij s->max = 1; 1719a7c066fSLinus Walleij s->step = 1; 1729a7c066fSLinus Walleij s->val = 1; 1739a7c066fSLinus Walleij } 1749a7c066fSLinus Walleij 1759a7c066fSLinus Walleij #else 1769a7c066fSLinus Walleij static void sgm3140_init_v4l2_flash_config(struct sgm3140 *priv, 1779a7c066fSLinus Walleij struct v4l2_flash_config *v4l2_sd_cfg) 1789a7c066fSLinus Walleij { 1799a7c066fSLinus Walleij } 1809a7c066fSLinus Walleij #endif 1819a7c066fSLinus Walleij 1829a7c066fSLinus Walleij static int sgm3140_probe(struct platform_device *pdev) 1839a7c066fSLinus Walleij { 1849a7c066fSLinus Walleij struct sgm3140 *priv; 1859a7c066fSLinus Walleij struct led_classdev *led_cdev; 1869a7c066fSLinus Walleij struct led_classdev_flash *fled_cdev; 1879a7c066fSLinus Walleij struct led_init_data init_data = {}; 1889a7c066fSLinus Walleij struct fwnode_handle *child_node; 1899a7c066fSLinus Walleij struct v4l2_flash_config v4l2_sd_cfg = {}; 1909a7c066fSLinus Walleij int ret; 1919a7c066fSLinus Walleij 1929a7c066fSLinus Walleij priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); 1939a7c066fSLinus Walleij if (!priv) 1949a7c066fSLinus Walleij return -ENOMEM; 1959a7c066fSLinus Walleij 1969a7c066fSLinus Walleij priv->flash_gpio = devm_gpiod_get(&pdev->dev, "flash", GPIOD_OUT_LOW); 1979a7c066fSLinus Walleij ret = PTR_ERR_OR_ZERO(priv->flash_gpio); 1989a7c066fSLinus Walleij if (ret) 1999a7c066fSLinus Walleij return dev_err_probe(&pdev->dev, ret, 2009a7c066fSLinus Walleij "Failed to request flash gpio\n"); 2019a7c066fSLinus Walleij 2029a7c066fSLinus Walleij priv->enable_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW); 2039a7c066fSLinus Walleij ret = PTR_ERR_OR_ZERO(priv->enable_gpio); 2049a7c066fSLinus Walleij if (ret) 2059a7c066fSLinus Walleij return dev_err_probe(&pdev->dev, ret, 2069a7c066fSLinus Walleij "Failed to request enable gpio\n"); 2079a7c066fSLinus Walleij 2089a7c066fSLinus Walleij priv->vin_regulator = devm_regulator_get(&pdev->dev, "vin"); 2099a7c066fSLinus Walleij ret = PTR_ERR_OR_ZERO(priv->vin_regulator); 2109a7c066fSLinus Walleij if (ret) 2119a7c066fSLinus Walleij return dev_err_probe(&pdev->dev, ret, 2129a7c066fSLinus Walleij "Failed to request regulator\n"); 2139a7c066fSLinus Walleij 2149a7c066fSLinus Walleij child_node = fwnode_get_next_available_child_node(pdev->dev.fwnode, 2159a7c066fSLinus Walleij NULL); 2169a7c066fSLinus Walleij if (!child_node) { 2179a7c066fSLinus Walleij dev_err(&pdev->dev, 2189a7c066fSLinus Walleij "No fwnode child node found for connected LED.\n"); 2199a7c066fSLinus Walleij return -EINVAL; 2209a7c066fSLinus Walleij } 2219a7c066fSLinus Walleij 2229a7c066fSLinus Walleij ret = fwnode_property_read_u32(child_node, "flash-max-timeout-us", 2239a7c066fSLinus Walleij &priv->max_timeout); 2249a7c066fSLinus Walleij if (ret) { 2259a7c066fSLinus Walleij priv->max_timeout = FLASH_MAX_TIMEOUT_DEFAULT; 2269a7c066fSLinus Walleij dev_warn(&pdev->dev, 2279a7c066fSLinus Walleij "flash-max-timeout-us property missing\n"); 2289a7c066fSLinus Walleij } 2299a7c066fSLinus Walleij 2309a7c066fSLinus Walleij /* 2319a7c066fSLinus Walleij * Set default timeout to FLASH_DEFAULT_TIMEOUT except if max_timeout 2329a7c066fSLinus Walleij * from DT is lower. 2339a7c066fSLinus Walleij */ 2349a7c066fSLinus Walleij priv->timeout = min(priv->max_timeout, FLASH_TIMEOUT_DEFAULT); 2359a7c066fSLinus Walleij 2369a7c066fSLinus Walleij timer_setup(&priv->powerdown_timer, sgm3140_powerdown_timer, 0); 2379a7c066fSLinus Walleij 2389a7c066fSLinus Walleij fled_cdev = &priv->fled_cdev; 2399a7c066fSLinus Walleij led_cdev = &fled_cdev->led_cdev; 2409a7c066fSLinus Walleij 2419a7c066fSLinus Walleij fled_cdev->ops = &sgm3140_flash_ops; 2429a7c066fSLinus Walleij 2439a7c066fSLinus Walleij led_cdev->brightness_set_blocking = sgm3140_brightness_set; 2449a7c066fSLinus Walleij led_cdev->max_brightness = LED_ON; 2459a7c066fSLinus Walleij led_cdev->flags |= LED_DEV_CAP_FLASH; 2469a7c066fSLinus Walleij 2479a7c066fSLinus Walleij sgm3140_init_flash_timeout(priv); 2489a7c066fSLinus Walleij 2499a7c066fSLinus Walleij init_data.fwnode = child_node; 2509a7c066fSLinus Walleij 2519a7c066fSLinus Walleij platform_set_drvdata(pdev, priv); 2529a7c066fSLinus Walleij 2539a7c066fSLinus Walleij /* Register in the LED subsystem */ 2549a7c066fSLinus Walleij ret = devm_led_classdev_flash_register_ext(&pdev->dev, 2559a7c066fSLinus Walleij fled_cdev, &init_data); 2569a7c066fSLinus Walleij if (ret) { 2579a7c066fSLinus Walleij dev_err(&pdev->dev, "Failed to register flash device: %d\n", 2589a7c066fSLinus Walleij ret); 2599a7c066fSLinus Walleij goto err; 2609a7c066fSLinus Walleij } 2619a7c066fSLinus Walleij 2629a7c066fSLinus Walleij sgm3140_init_v4l2_flash_config(priv, &v4l2_sd_cfg); 2639a7c066fSLinus Walleij 2649a7c066fSLinus Walleij /* Create V4L2 Flash subdev */ 2659a7c066fSLinus Walleij priv->v4l2_flash = v4l2_flash_init(&pdev->dev, 2669a7c066fSLinus Walleij child_node, 2679a7c066fSLinus Walleij fled_cdev, NULL, 2689a7c066fSLinus Walleij &v4l2_sd_cfg); 2699a7c066fSLinus Walleij if (IS_ERR(priv->v4l2_flash)) { 2709a7c066fSLinus Walleij ret = PTR_ERR(priv->v4l2_flash); 2719a7c066fSLinus Walleij goto err; 2729a7c066fSLinus Walleij } 2739a7c066fSLinus Walleij 2749a7c066fSLinus Walleij return ret; 2759a7c066fSLinus Walleij 2769a7c066fSLinus Walleij err: 2779a7c066fSLinus Walleij fwnode_handle_put(child_node); 2789a7c066fSLinus Walleij return ret; 2799a7c066fSLinus Walleij } 2809a7c066fSLinus Walleij 281*60613020SUwe Kleine-König static void sgm3140_remove(struct platform_device *pdev) 2829a7c066fSLinus Walleij { 2839a7c066fSLinus Walleij struct sgm3140 *priv = platform_get_drvdata(pdev); 2849a7c066fSLinus Walleij 2859a7c066fSLinus Walleij del_timer_sync(&priv->powerdown_timer); 2869a7c066fSLinus Walleij 2879a7c066fSLinus Walleij v4l2_flash_release(priv->v4l2_flash); 2889a7c066fSLinus Walleij } 2899a7c066fSLinus Walleij 2909a7c066fSLinus Walleij static const struct of_device_id sgm3140_dt_match[] = { 29177d62fccSAndré Apitzsch { .compatible = "ocs,ocp8110" }, 2927bd932d9SRaymond Hackley { .compatible = "richtek,rt5033-led" }, 2939a7c066fSLinus Walleij { .compatible = "sgmicro,sgm3140" }, 2949a7c066fSLinus Walleij { /* sentinel */ } 2959a7c066fSLinus Walleij }; 2969a7c066fSLinus Walleij MODULE_DEVICE_TABLE(of, sgm3140_dt_match); 2979a7c066fSLinus Walleij 2989a7c066fSLinus Walleij static struct platform_driver sgm3140_driver = { 2999a7c066fSLinus Walleij .probe = sgm3140_probe, 300*60613020SUwe Kleine-König .remove_new = sgm3140_remove, 3019a7c066fSLinus Walleij .driver = { 3029a7c066fSLinus Walleij .name = "sgm3140", 3039a7c066fSLinus Walleij .of_match_table = sgm3140_dt_match, 3049a7c066fSLinus Walleij }, 3059a7c066fSLinus Walleij }; 3069a7c066fSLinus Walleij 3079a7c066fSLinus Walleij module_platform_driver(sgm3140_driver); 3089a7c066fSLinus Walleij 3099a7c066fSLinus Walleij MODULE_AUTHOR("Luca Weiss <luca@z3ntu.xyz>"); 3109a7c066fSLinus Walleij MODULE_DESCRIPTION("SG Micro SGM3140 charge pump LED driver"); 3119a7c066fSLinus Walleij MODULE_LICENSE("GPL v2"); 312