Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 171 insertions, 0 deletions

diff --git a/drivers/media/rc/gpio-ir-tx.c b/drivers/media/rc/gpio-ir-tx.c
new file mode 100644
index 000000000..4e70b67cc
--- /dev/null
+++ b/drivers/media/rc/gpio-ir-tx.c
@@ -0,0 +1,171 @@
+/*
+ * 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>
+#include <linux/module.h>
+#include <linux/gpio/consumer.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <media/rc-core.h>
+
+#define DRIVER_NAME	"gpio-ir-tx"
+#define DEVICE_NAME	"GPIO IR Bit Banging Transmitter"
+
+struct gpio_ir {
+	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[] = {
+	{ .compatible = "gpio-ir-tx", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, gpio_ir_tx_of_match);
+
+static int gpio_ir_tx_set_duty_cycle(struct rc_dev *dev, u32 duty_cycle)
+{
+	struct gpio_ir *gpio_ir = dev->priv;
+
+	gpio_ir->duty_cycle = duty_cycle;
+
+	return 0;
+}
+
+static int gpio_ir_tx_set_carrier(struct rc_dev *dev, u32 carrier)
+{
+	struct gpio_ir *gpio_ir = dev->priv;
+
+	if (!carrier)
+		return -EINVAL;
+
+	gpio_ir->carrier = carrier;
+
+	return 0;
+}
+
+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;
+	ktime_t edge;
+	/*
+	 * 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;
+	int i;
+	unsigned int pulse, space;
+
+	/* Ensure the dividend fits into 32 bit */
+	pulse = DIV_ROUND_CLOSEST(gpio_ir->duty_cycle * (NSEC_PER_SEC / 100),
+				  gpio_ir->carrier);
+	space = DIV_ROUND_CLOSEST((100 - gpio_ir->duty_cycle) *
+				  (NSEC_PER_SEC / 100), gpio_ir->carrier);
+
+	spin_lock_irqsave(&gpio_ir->lock, flags);
+
+	edge = ktime_get();
+
+	for (i = 0; i < count; i++) {
+		if (i % 2) {
+			// space
+			edge = ktime_add_us(edge, txbuf[i]);
+			delta = ktime_us_delta(edge, ktime_get());
+			if (delta > 0)
+				udelay(delta);
+		} else {
+			// pulse
+			ktime_t last = ktime_add_us(edge, txbuf[i]);
+
+			while (ktime_before(ktime_get(), last)) {
+				gpiod_set_value(gpio_ir->gpio, 1);
+				edge = ktime_add_ns(edge, pulse);
+				delta = ktime_to_ns(ktime_sub(edge,
+							      ktime_get()));
+				if (delta > 0)
+					ndelay(delta);
+				gpiod_set_value(gpio_ir->gpio, 0);
+				edge = ktime_add_ns(edge, space);
+				delta = ktime_to_ns(ktime_sub(edge,
+							      ktime_get()));
+				if (delta > 0)
+					ndelay(delta);
+			}
+
+			edge = last;
+		}
+	}
+
+	spin_unlock_irqrestore(&gpio_ir->lock, flags);
+
+	return count;
+}
+
+static int gpio_ir_tx_probe(struct platform_device *pdev)
+{
+	struct gpio_ir *gpio_ir;
+	struct rc_dev *rcdev;
+	int rc;
+
+	gpio_ir = devm_kmalloc(&pdev->dev, sizeof(*gpio_ir), GFP_KERNEL);
+	if (!gpio_ir)
+		return -ENOMEM;
+
+	rcdev = devm_rc_allocate_device(&pdev->dev, RC_DRIVER_IR_RAW_TX);
+	if (!rcdev)
+		return -ENOMEM;
+
+	gpio_ir->gpio = devm_gpiod_get(&pdev->dev, NULL, GPIOD_OUT_LOW);
+	if (IS_ERR(gpio_ir->gpio)) {
+		if (PTR_ERR(gpio_ir->gpio) != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "Failed to get gpio (%ld)\n",
+				PTR_ERR(gpio_ir->gpio));
+		return PTR_ERR(gpio_ir->gpio);
+	}
+
+	rcdev->priv = gpio_ir;
+	rcdev->driver_name = DRIVER_NAME;
+	rcdev->device_name = DEVICE_NAME;
+	rcdev->tx_ir = gpio_ir_tx;
+	rcdev->s_tx_duty_cycle = gpio_ir_tx_set_duty_cycle;
+	rcdev->s_tx_carrier = gpio_ir_tx_set_carrier;
+
+	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)
+		dev_err(&pdev->dev, "failed to register rc device\n");
+
+	return rc;
+}
+
+static struct platform_driver gpio_ir_tx_driver = {
+	.probe	= gpio_ir_tx_probe,
+	.driver = {
+		.name	= DRIVER_NAME,
+		.of_match_table = of_match_ptr(gpio_ir_tx_of_match),
+	},
+};
+module_platform_driver(gpio_ir_tx_driver);
+
+MODULE_DESCRIPTION("GPIO IR Bit Banging Transmitter");
+MODULE_AUTHOR("Sean Young <sean@mess.org>");
+MODULE_LICENSE("GPL");