From cde9070d9970eef1f7ec2360586c802a16230ad8 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:43:50 +0000
Subject: [PATCH] rtl88x2CE_WiFi_linux driver
---
kernel/drivers/media/rc/gpio-ir-tx.c | 80 +++++++++++++++++++++++++++++-----------
1 files changed, 58 insertions(+), 22 deletions(-)
diff --git a/kernel/drivers/media/rc/gpio-ir-tx.c b/kernel/drivers/media/rc/gpio-ir-tx.c
index 4e70b67..a50701c 100644
--- a/kernel/drivers/media/rc/gpio-ir-tx.c
+++ b/kernel/drivers/media/rc/gpio-ir-tx.c
@@ -1,14 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2017 Sean Young <sean@mess.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
*/
#include <linux/kernel.h>
@@ -27,8 +19,6 @@
struct gpio_desc *gpio;
unsigned int carrier;
unsigned int duty_cycle;
- /* we need a spinlock to hold the cpu while transmitting */
- spinlock_t lock;
};
static const struct of_device_id gpio_ir_tx_of_match[] = {
@@ -50,7 +40,7 @@
{
struct gpio_ir *gpio_ir = dev->priv;
- if (!carrier)
+ if (carrier > 500000)
return -EINVAL;
gpio_ir->carrier = carrier;
@@ -58,11 +48,48 @@
return 0;
}
-static int gpio_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
- unsigned int count)
+static void delay_until(ktime_t until)
{
- struct gpio_ir *gpio_ir = dev->priv;
- unsigned long flags;
+ /*
+ * delta should never exceed 0.5 seconds (IR_MAX_DURATION) and on
+ * m68k ndelay(s64) does not compile; so use s32 rather than s64.
+ */
+ s32 delta;
+
+ while (true) {
+ delta = ktime_us_delta(until, ktime_get());
+ if (delta <= 0)
+ return;
+
+ /* udelay more than 1ms may not work */
+ delta = min(delta, 1000);
+ udelay(delta);
+ }
+}
+
+static void gpio_ir_tx_unmodulated(struct gpio_ir *gpio_ir, uint *txbuf,
+ uint count)
+{
+ ktime_t edge;
+ int i;
+
+ local_irq_disable();
+
+ edge = ktime_get();
+
+ for (i = 0; i < count; i++) {
+ gpiod_set_value(gpio_ir->gpio, !(i % 2));
+
+ edge = ktime_add_us(edge, txbuf[i]);
+ delay_until(edge);
+ }
+
+ gpiod_set_value(gpio_ir->gpio, 0);
+}
+
+static void gpio_ir_tx_modulated(struct gpio_ir *gpio_ir, uint *txbuf,
+ uint count)
+{
ktime_t edge;
/*
* delta should never exceed 0.5 seconds (IR_MAX_DURATION) and on
@@ -78,7 +105,7 @@
space = DIV_ROUND_CLOSEST((100 - gpio_ir->duty_cycle) *
(NSEC_PER_SEC / 100), gpio_ir->carrier);
- spin_lock_irqsave(&gpio_ir->lock, flags);
+ local_irq_disable();
edge = ktime_get();
@@ -86,9 +113,7 @@
if (i % 2) {
// space
edge = ktime_add_us(edge, txbuf[i]);
- delta = ktime_us_delta(edge, ktime_get());
- if (delta > 0)
- udelay(delta);
+ delay_until(edge);
} else {
// pulse
ktime_t last = ktime_add_us(edge, txbuf[i]);
@@ -111,8 +136,20 @@
edge = last;
}
}
+}
- spin_unlock_irqrestore(&gpio_ir->lock, flags);
+static int gpio_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
+ unsigned int count)
+{
+ struct gpio_ir *gpio_ir = dev->priv;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ if (gpio_ir->carrier)
+ gpio_ir_tx_modulated(gpio_ir, txbuf, count);
+ else
+ gpio_ir_tx_unmodulated(gpio_ir, txbuf, count);
+ local_irq_restore(flags);
return count;
}
@@ -148,7 +185,6 @@
gpio_ir->carrier = 38000;
gpio_ir->duty_cycle = 50;
- spin_lock_init(&gpio_ir->lock);
rc = devm_rc_register_device(&pdev->dev, rcdev);
if (rc < 0)
--
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