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![Jacek Anaszewski](/assets/img/avatar_default.png)
Replace of_led_classdev_register() with led_classdev_register_ext(), which accepts easily extendable struct led_init_data, instead of the fixed struct device_node argument. The latter can be now passed in an fwnode property of the struct led_init_data. The modification is driven by the need for passing additional arguments required for the forthcoming generic mechanism for composing LED names. Currently the LED name is conveyed in the "name" char pointer property of the struct led_classdev. This is redundant since LED class device name is accessible throughout the whole LED class device life time via associated struct device's kobj->name property. The change will not break any existing clients since the patch alters also existing led_classdev{_flash}_register() macro wrappers, that pass NULL in place of init_data, which leads to using legacy name initialization path basing on the struct led_classdev's "name" property. Three existing users of devm_of_led_classdev_registers() are modified to use devm_led_classdev_register(), which will not impact their operation since they in fact didn't need to pass struct device_node on registration from the beginning. Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com> Cc: Baolin Wang <baolin.wang@linaro.org> Cc: Dan Murphy <dmurphy@ti.com> Cc: Daniel Mack <daniel@zonque.org> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Oleh Kravchenko <oleg@kaa.org.ua> Cc: Sakari Ailus <sakari.ailus@linux.intel.com> Cc: Simon Shields <simon@lineageos.org> Acked-by: Pavel Machek <pavel@ucw.cz>
313 lines
7.1 KiB
C
313 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2018 Crane Merchandising Systems. All rights reserved.
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// Copyright (C) 2018 Oleh Kravchenko <oleg@kaa.org.ua>
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#include <linux/delay.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/spi/spi.h>
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#include <linux/workqueue.h>
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#include <uapi/linux/uleds.h>
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/*
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* CR0014114 SPI protocol descrtiption:
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* +----+-----------------------------------+----+
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* | CMD| BRIGHTNESS |CRC |
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* +----+-----------------------------------+----+
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* | | LED0| LED1| LED2| LED3| LED4| LED5| |
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* | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | |R|G|B|R|G|B|R|G|B|R|G|B|R|G|B|R|G|B| |
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* | 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 1 |
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* | |1|1|1|1|1|1|1|1|1|1|1|1|1|1|1|1|1|1| |
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* | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* | | 18 | |
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* +----+-----------------------------------+----+
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* | 20 |
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* +---------------------------------------------+
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*
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* PS: Boards can be connected to the chain:
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* SPI -> board0 -> board1 -> board2 ..
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*/
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/* CR0014114 SPI commands */
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#define CR_SET_BRIGHTNESS 0x80
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#define CR_INIT_REENUMERATE 0x81
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#define CR_NEXT_REENUMERATE 0x82
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/* CR0014114 default settings */
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#define CR_MAX_BRIGHTNESS GENMASK(6, 0)
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#define CR_FW_DELAY_MSEC 10
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#define CR_RECOUNT_DELAY (HZ * 3600)
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struct cr0014114_led {
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char name[LED_MAX_NAME_SIZE];
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struct cr0014114 *priv;
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struct led_classdev ldev;
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u8 brightness;
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};
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struct cr0014114 {
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bool do_recount;
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size_t count;
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struct delayed_work work;
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struct device *dev;
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struct mutex lock;
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struct spi_device *spi;
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u8 *buf;
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unsigned long delay;
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struct cr0014114_led leds[];
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};
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static void cr0014114_calc_crc(u8 *buf, const size_t len)
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{
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size_t i;
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u8 crc;
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for (i = 1, crc = 1; i < len - 1; i++)
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crc += buf[i];
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crc |= BIT(7);
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/* special case when CRC matches the SPI commands */
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if (crc == CR_SET_BRIGHTNESS ||
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crc == CR_INIT_REENUMERATE ||
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crc == CR_NEXT_REENUMERATE)
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crc = 0xfe;
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buf[len - 1] = crc;
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}
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static int cr0014114_recount(struct cr0014114 *priv)
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{
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int ret;
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size_t i;
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u8 cmd;
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dev_dbg(priv->dev, "LEDs recount is started\n");
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cmd = CR_INIT_REENUMERATE;
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ret = spi_write(priv->spi, &cmd, sizeof(cmd));
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if (ret)
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goto err;
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cmd = CR_NEXT_REENUMERATE;
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for (i = 0; i < priv->count; i++) {
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msleep(CR_FW_DELAY_MSEC);
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ret = spi_write(priv->spi, &cmd, sizeof(cmd));
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if (ret)
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goto err;
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}
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err:
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dev_dbg(priv->dev, "LEDs recount is finished\n");
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if (ret)
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dev_err(priv->dev, "with error %d", ret);
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return ret;
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}
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static int cr0014114_sync(struct cr0014114 *priv)
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{
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int ret;
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size_t i;
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unsigned long udelay, now = jiffies;
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/* to avoid SPI mistiming with firmware we should wait some time */
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if (time_after(priv->delay, now)) {
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udelay = jiffies_to_usecs(priv->delay - now);
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usleep_range(udelay, udelay + 1);
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}
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if (unlikely(priv->do_recount)) {
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ret = cr0014114_recount(priv);
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if (ret)
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goto err;
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priv->do_recount = false;
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msleep(CR_FW_DELAY_MSEC);
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}
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priv->buf[0] = CR_SET_BRIGHTNESS;
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for (i = 0; i < priv->count; i++)
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priv->buf[i + 1] = priv->leds[i].brightness;
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cr0014114_calc_crc(priv->buf, priv->count + 2);
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ret = spi_write(priv->spi, priv->buf, priv->count + 2);
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err:
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priv->delay = jiffies + msecs_to_jiffies(CR_FW_DELAY_MSEC);
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return ret;
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}
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static void cr0014114_recount_work(struct work_struct *work)
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{
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int ret;
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struct cr0014114 *priv = container_of(work,
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struct cr0014114,
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work.work);
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mutex_lock(&priv->lock);
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priv->do_recount = true;
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ret = cr0014114_sync(priv);
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mutex_unlock(&priv->lock);
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if (ret)
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dev_warn(priv->dev, "sync of LEDs failed %d\n", ret);
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schedule_delayed_work(&priv->work, CR_RECOUNT_DELAY);
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}
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static int cr0014114_set_sync(struct led_classdev *ldev,
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enum led_brightness brightness)
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{
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int ret;
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struct cr0014114_led *led = container_of(ldev,
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struct cr0014114_led,
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ldev);
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dev_dbg(led->priv->dev, "Set brightness of %s to %d\n",
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led->name, brightness);
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mutex_lock(&led->priv->lock);
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led->brightness = (u8)brightness;
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ret = cr0014114_sync(led->priv);
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mutex_unlock(&led->priv->lock);
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return ret;
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}
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static int cr0014114_probe_dt(struct cr0014114 *priv)
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{
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size_t i = 0;
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struct cr0014114_led *led;
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struct fwnode_handle *child;
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struct device_node *np;
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int ret;
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const char *str;
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device_for_each_child_node(priv->dev, child) {
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np = to_of_node(child);
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led = &priv->leds[i];
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ret = fwnode_property_read_string(child, "label", &str);
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if (ret)
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snprintf(led->name, sizeof(led->name),
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"cr0014114::");
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else
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snprintf(led->name, sizeof(led->name),
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"cr0014114:%s", str);
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fwnode_property_read_string(child, "linux,default-trigger",
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&led->ldev.default_trigger);
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led->priv = priv;
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led->ldev.name = led->name;
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led->ldev.max_brightness = CR_MAX_BRIGHTNESS;
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led->ldev.brightness_set_blocking = cr0014114_set_sync;
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ret = devm_led_classdev_register(priv->dev, &led->ldev);
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if (ret) {
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dev_err(priv->dev,
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"failed to register LED device %s, err %d",
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led->name, ret);
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fwnode_handle_put(child);
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return ret;
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}
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led->ldev.dev->of_node = np;
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i++;
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}
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return 0;
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}
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static int cr0014114_probe(struct spi_device *spi)
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{
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struct cr0014114 *priv;
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size_t count;
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int ret;
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count = device_get_child_node_count(&spi->dev);
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if (!count) {
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dev_err(&spi->dev, "LEDs are not defined in device tree!");
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return -ENODEV;
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}
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priv = devm_kzalloc(&spi->dev, struct_size(priv, leds, count),
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GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->buf = devm_kzalloc(&spi->dev, count + 2, GFP_KERNEL);
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if (!priv->buf)
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return -ENOMEM;
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mutex_init(&priv->lock);
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INIT_DELAYED_WORK(&priv->work, cr0014114_recount_work);
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priv->count = count;
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priv->dev = &spi->dev;
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priv->spi = spi;
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priv->delay = jiffies -
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msecs_to_jiffies(CR_FW_DELAY_MSEC);
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priv->do_recount = true;
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ret = cr0014114_sync(priv);
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if (ret) {
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dev_err(priv->dev, "first recount failed %d\n", ret);
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return ret;
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}
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priv->do_recount = true;
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ret = cr0014114_sync(priv);
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if (ret) {
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dev_err(priv->dev, "second recount failed %d\n", ret);
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return ret;
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}
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ret = cr0014114_probe_dt(priv);
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if (ret)
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return ret;
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/* setup recount work to workaround buggy firmware */
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schedule_delayed_work(&priv->work, CR_RECOUNT_DELAY);
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spi_set_drvdata(spi, priv);
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return 0;
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}
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static int cr0014114_remove(struct spi_device *spi)
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{
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struct cr0014114 *priv = spi_get_drvdata(spi);
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cancel_delayed_work_sync(&priv->work);
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mutex_destroy(&priv->lock);
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return 0;
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}
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static const struct of_device_id cr0014114_dt_ids[] = {
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{ .compatible = "crane,cr0014114", },
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{},
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};
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MODULE_DEVICE_TABLE(of, cr0014114_dt_ids);
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static struct spi_driver cr0014114_driver = {
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.probe = cr0014114_probe,
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.remove = cr0014114_remove,
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.driver = {
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.name = KBUILD_MODNAME,
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.of_match_table = cr0014114_dt_ids,
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},
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};
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module_spi_driver(cr0014114_driver);
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MODULE_AUTHOR("Oleh Kravchenko <oleg@kaa.org.ua>");
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MODULE_DESCRIPTION("cr0014114 LED driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("spi:cr0014114");
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