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300 lines
6.7 KiB
300 lines
6.7 KiB
// 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 <[email protected]> |
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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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/* |
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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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#define CR_DEV_NAME "cr0014114" |
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struct cr0014114_led { |
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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 to %d\n", 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 led_init_data init_data = {}; |
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int ret; |
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device_for_each_child_node(priv->dev, child) { |
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led = &priv->leds[i]; |
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led->priv = priv; |
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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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init_data.fwnode = child; |
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init_data.devicename = CR_DEV_NAME; |
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init_data.default_label = ":"; |
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ret = devm_led_classdev_register_ext(priv->dev, &led->ldev, |
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&init_data); |
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if (ret) { |
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dev_err(priv->dev, |
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"failed to register LED device, err %d", ret); |
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fwnode_handle_put(child); |
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return ret; |
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} |
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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 <[email protected]>"); |
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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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