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Commit 449c1fcd authored by Heiner Kallweit's avatar Heiner Kallweit Committed by Mauro Carvalho Chehab
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[media] media: rc: nuvoton: support reading / writing wakeup sequence via sysfs 



This patch adds a binary attribute /sys/class/rc/rc?/wakeup_data which
allows to read / write the wakeup sequence.

In combination with the core extension for exposing the most recent raw
packet this allows to easily define and set a wakeup sequence.

At least on my Zotac CI321 the BIOS resets the wakeup sequence at each boot
to a factory default. Therefore I use a udev rule
SUBSYSTEM=="rc", DRIVERS=="nuvoton-cir", ACTION=="add", RUN+="<script>"
with the script basically doing
cat <stored wakeup sequence> >/sys${DEVPATH}/wakeup_data

Signed-off-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent 5ed08a86

drivers/media/rc/nuvoton-cir.c

+85 −0
Original line number Diff line number Diff line
@@ -39,6 +39,8 @@ 


#include "nuvoton-cir.h"



static void nvt_clear_cir_wake_fifo(struct nvt_dev *nvt);



static const struct nvt_chip nvt_chips[] = {

	{ "w83667hg", NVT_W83667HG },

	{ "NCT6775F", NVT_6775F },
@@ -177,6 +179,83 @@ static void nvt_set_ioaddr(struct nvt_dev *nvt, unsigned long *ioaddr) 
	}

}



static ssize_t wakeup_data_read(struct file *fp, struct kobject *kobj,

				struct bin_attribute *bin_attr,

				char *buf, loff_t off, size_t count)

{

	struct device *dev = kobj_to_dev(kobj);

	struct rc_dev *rc_dev = to_rc_dev(dev);

	struct nvt_dev *nvt = rc_dev->priv;

	int fifo_len, len;

	unsigned long flags;

	int i;



	spin_lock_irqsave(&nvt->nvt_lock, flags);



	fifo_len = nvt_cir_wake_reg_read(nvt, CIR_WAKE_FIFO_COUNT);

	len = min(fifo_len, WAKEUP_MAX_SIZE);



	if (off >= len) {

		spin_unlock_irqrestore(&nvt->nvt_lock, flags);

		return 0;

	}



	if (len > count)

		len = count;



	/* go to first element to be read */

	while (nvt_cir_wake_reg_read(nvt, CIR_WAKE_RD_FIFO_ONLY_IDX) != off)

		nvt_cir_wake_reg_read(nvt, CIR_WAKE_RD_FIFO_ONLY);



	for (i = 0; i < len; i++)

		buf[i] = nvt_cir_wake_reg_read(nvt, CIR_WAKE_RD_FIFO_ONLY);



	spin_unlock_irqrestore(&nvt->nvt_lock, flags);



	return len;

}



static ssize_t wakeup_data_write(struct file *fp, struct kobject *kobj,

				struct bin_attribute *bin_attr,

				char *buf, loff_t off, size_t count)

{

	struct device *dev = kobj_to_dev(kobj);

	struct rc_dev *rc_dev = to_rc_dev(dev);

	struct nvt_dev *nvt = rc_dev->priv;

	unsigned long flags;

	u8 tolerance, config;

	int i;



	if (off > 0)

		return -EINVAL;



	/* hardcode the tolerance to 10% */

	tolerance = DIV_ROUND_UP(count, 10);



	spin_lock_irqsave(&nvt->nvt_lock, flags);



	nvt_clear_cir_wake_fifo(nvt);

	nvt_cir_wake_reg_write(nvt, count, CIR_WAKE_FIFO_CMP_DEEP);

	nvt_cir_wake_reg_write(nvt, tolerance, CIR_WAKE_FIFO_CMP_TOL);



	config = nvt_cir_wake_reg_read(nvt, CIR_WAKE_IRCON);



	/* enable writes to wake fifo */

	nvt_cir_wake_reg_write(nvt, config | CIR_WAKE_IRCON_MODE1,

			       CIR_WAKE_IRCON);



	for (i = 0; i < count; i++)

		nvt_cir_wake_reg_write(nvt, buf[i], CIR_WAKE_WR_FIFO_DATA);



	nvt_cir_wake_reg_write(nvt, config, CIR_WAKE_IRCON);



	spin_unlock_irqrestore(&nvt->nvt_lock, flags);



	return count;

}



static BIN_ATTR_RW(wakeup_data, WAKEUP_MAX_SIZE);



/* dump current cir register contents */

static void cir_dump_regs(struct nvt_dev *nvt)

{
@@ -1133,6 +1212,10 @@ static int nvt_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id) 
			     NVT_DRIVER_NAME "-wake", (void *)nvt))

		goto exit_unregister_device;



	ret = device_create_bin_file(&rdev->dev, &bin_attr_wakeup_data);

	if (ret)

		goto exit_unregister_device;



	device_init_wakeup(&pdev->dev, true);



	dev_notice(&pdev->dev, "driver has been successfully loaded\n");
@@ -1156,6 +1239,8 @@ static void nvt_remove(struct pnp_dev *pdev) 
{

	struct nvt_dev *nvt = pnp_get_drvdata(pdev);



	device_remove_bin_file(&nvt->rdev->dev, &bin_attr_wakeup_data);



	nvt_disable_cir(nvt);



	/* enable CIR Wake (for IR power-on) */

drivers/media/rc/nuvoton-cir.h

+3 −0
Original line number Diff line number Diff line
@@ -417,3 +417,6 @@ struct nvt_dev { 
/* as VISTA MCE definition, valid carrier value */

#define MAX_CARRIER 60000

#define MIN_CARRIER 30000



/* max wakeup sequence length */

#define WAKEUP_MAX_SIZE 65