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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: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Heiner Kallweit 2016-02-08 17:25:59 -02:00 committed by Mauro Carvalho Chehab
parent 5ed08a8649
commit 449c1fcd86
2 changed files with 88 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

85
drivers/media/rc/nuvoton-cir.c
View File

@ -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) */

3
drivers/media/rc/nuvoton-cir.h
View File

@ -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