Anforderungen  |   Konzepte  |   Entwurf  |   Entwicklung  |   Qualitätssicherung  |   Lebenszyklus  |   Steuerung
 
 
 
 

products/sources/formale Sprachen/C/Firefox/layout/svg/crashtests/   (Browser von der Mozilla Stiftung Version 136.0.1©)  Datei vom 10.2.2025 mit Größe 314 B image not shown  

Bilddatei

leds-cr0014114.c


products/sources/formale Sprachen/C/Linux/drivers/leds/leds-cr0014114.c

// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2018 Crane Merchandising Systems. All rights reserved. // Copyright (C) 2018 Oleh Kravchenko #include #include #include #include #include #include /* * CR0014114 SPI protocol descrtiption: * +----+-----------------------------------+----+ * | CMD| BRIGHTNESS |CRC | * +----+-----------------------------------+----+ * | | LED0| LED1| LED2| LED3| LED4| LED5| | * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | * | |R|G|B|R|G|B|R|G|B|R|G|B|R|G|B|R|G|B| | * | 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1 | * | |1|1|1|1|1|1|1|1|1|1|1|1|1|1|1|1|1|1| | * | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | * | | 18 | | * +----+-----------------------------------+----+ * | 20 | * +---------------------------------------------+ * * PS: Boards can be connected to the chain: * SPI -> board0 -> board1 -> board2 .. */ /* CR0014114 SPI commands */ #define CR_SET_BRIGHTNESS 0x80 #define CR_INIT_REENUMERATE 0x81 #define CR_NEXT_REENUMERATE 0x82 /* CR0014114 default settings */ #define CR_MAX_BRIGHTNESS GENMASK(6, 0) #define CR_FW_DELAY_MSEC 10 #define CR_RECOUNT_DELAY (HZ * 3600) #define CR_DEV_NAME "cr0014114" struct cr0014114_led { struct cr0014114 *priv; struct led_classdev ldev; u8 brightness; }; struct cr0014114 { bool do_recount; size_t count; struct delayed_work work; struct device *dev; struct mutex lock; struct spi_device *spi; u8 *buf; unsigned long delay; struct cr0014114_led leds[] __counted_by(count); }; static void cr0014114_calc_crc(u8 *buf, const size_t len) { size_t i; u8 crc; for (i = 1, crc = 1; i < len - 1; i++) crc += buf[i]; crc |= BIT(7); /* special case when CRC matches the SPI commands */ if (crc == CR_SET_BRIGHTNESS || crc == CR_INIT_REENUMERATE || crc == CR_NEXT_REENUMERATE) crc = 0xfe; buf[len - 1] = crc; } static int cr0014114_recount(struct cr0014114 *priv) { int ret; size_t i; u8 cmd; dev_dbg(priv->dev, "LEDs recount is started\n"); cmd = CR_INIT_REENUMERATE; ret = spi_write(priv->spi, &cmd, sizeof(cmd)); if (ret) goto err; cmd = CR_NEXT_REENUMERATE; for (i = 0; i < priv->count; i++) { msleep(CR_FW_DELAY_MSEC); ret = spi_write(priv->spi, &cmd, sizeof(cmd)); if (ret) goto err; } err: dev_dbg(priv->dev, "LEDs recount is finished\n"); if (ret) dev_err(priv->dev, "with error %d", ret); return ret; } static int cr0014114_sync(struct cr0014114 *priv) { int ret; size_t i; unsigned long udelay, now = jiffies; /* to avoid SPI mistiming with firmware we should wait some time */ if (time_after(priv->delay, now)) { udelay = jiffies_to_usecs(priv->delay - now); usleep_range(udelay, udelay + 1); } if (unlikely(priv->do_recount)) { ret = cr0014114_recount(priv); if (ret) goto err; priv->do_recount = false; msleep(CR_FW_DELAY_MSEC); } priv->buf[0] = CR_SET_BRIGHTNESS; for (i = 0; i < priv->count; i++) priv->buf[i + 1] = priv->leds[i].brightness; cr0014114_calc_crc(priv->buf, priv->count + 2); ret = spi_write(priv->spi, priv->buf, priv->count + 2); err: priv->delay = jiffies + msecs_to_jiffies(CR_FW_DELAY_MSEC); return ret; } static void cr0014114_recount_work(struct work_struct *work) { int ret; struct cr0014114 *priv = container_of(work, struct cr0014114, work.work); mutex_lock(&priv->lock); priv->do_recount = true; ret = cr0014114_sync(priv); mutex_unlock(&priv->lock); if (ret) dev_warn(priv->dev, "sync of LEDs failed %d\n", ret); schedule_delayed_work(&priv->work, CR_RECOUNT_DELAY); } static int cr0014114_set_sync(struct led_classdev *ldev, enum led_brightness brightness) { int ret; struct cr0014114_led *led = container_of(ldev, struct cr0014114_led, ldev); dev_dbg(led->priv->dev, "Set brightness to %d\n", brightness); mutex_lock(&led->priv->lock); led->brightness = (u8)brightness; ret = cr0014114_sync(led->priv); mutex_unlock(&led->priv->lock); return ret; } static int cr0014114_probe_dt(struct cr0014114 *priv) { size_t i = 0; struct cr0014114_led *led; struct led_init_data init_data = {}; int ret; device_for_each_child_node_scoped(priv->dev, child) { led = &priv->leds[i]; led->priv = priv; led->ldev.max_brightness = CR_MAX_BRIGHTNESS; led->ldev.brightness_set_blocking = cr0014114_set_sync; init_data.fwnode = child; init_data.devicename = CR_DEV_NAME; init_data.default_label = ":"; ret = devm_led_classdev_register_ext(priv->dev, &led->ldev, &init_data); if (ret) { dev_err(priv->dev, "failed to register LED device, err %d", ret); return ret; } i++; } return 0; } static int cr0014114_probe(struct spi_device *spi) { struct cr0014114 *priv; size_t count; int ret; count = device_get_child_node_count(&spi->dev); if (!count) { dev_err(&spi->dev, "LEDs are not defined in device tree!"); return -ENODEV; } priv = devm_kzalloc(&spi->dev, struct_size(priv, leds, count), GFP_KERNEL); if (!priv) return -ENOMEM; priv->buf = devm_kzalloc(&spi->dev, count + 2, GFP_KERNEL); if (!priv->buf) return -ENOMEM; mutex_init(&priv->lock); INIT_DELAYED_WORK(&priv->work, cr0014114_recount_work); priv->count = count; priv->dev = &spi->dev; priv->spi = spi; priv->delay = jiffies - msecs_to_jiffies(CR_FW_DELAY_MSEC); priv->do_recount = true; ret = cr0014114_sync(priv); if (ret) { dev_err(priv->dev, "first recount failed %d\n", ret); return ret; } priv->do_recount = true; ret = cr0014114_sync(priv); if (ret) { dev_err(priv->dev, "second recount failed %d\n", ret); return ret; } ret = cr0014114_probe_dt(priv); if (ret) return ret; /* setup recount work to workaround buggy firmware */ schedule_delayed_work(&priv->work, CR_RECOUNT_DELAY); spi_set_drvdata(spi, priv); return 0; } static void cr0014114_remove(struct spi_device *spi) { struct cr0014114 *priv = spi_get_drvdata(spi); cancel_delayed_work_sync(&priv->work); mutex_destroy(&priv->lock); } static const struct of_device_id cr0014114_dt_ids[] = { { .compatible = "crane,cr0014114", }, {}, }; MODULE_DEVICE_TABLE(of, cr0014114_dt_ids); static struct spi_driver cr0014114_driver = { .probe = cr0014114_probe, .remove = cr0014114_remove, .driver = { .name = KBUILD_MODNAME, .of_match_table = cr0014114_dt_ids, }, }; module_spi_driver(cr0014114_driver); MODULE_AUTHOR("Oleh Kravchenko "); MODULE_DESCRIPTION("cr0014114 LED driver"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("spi:cr0014114");

                                                                                                                                                                                                                                                                                                                                                                                                     

Neuigkeiten

     Aktuelles
     Motto des Tages

Software

     Produkte
     Quellcodebibliothek

Aktivitäten

     Artikel über Sicherheit
     Anleitung zur Aktivierung von SSL

Muße

     Gedichte
     Musik
     Bilder
Jenseits des Üblichen ....
    

Besucherstatistik

Besucherstatistik

Monitoring

Montastic status badge