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[media] media: rc: nuvoton: switch attribute wakeup_data to text

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Switch attribute wakeup_data from binary to a text attribute.
This makes it easier to handle in userspace and allows to
use the output of tools like mode2 almost as is to set a
wakeup sequence.
Changing to a text format and values in microseconds also
makes the userspace interface independent of the setting of
SAMPLE_PERIOD in the driver.

In addition document the new sysfs attribute in
Documentation/ABI/testing/sysfs-class-rc-nuvoton.

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 2016-03-04 16:11:40 -03:00 committed by Mauro Carvalho Chehab
parent fcbafafb7d
commit 02212001c9
2 changed files with 68 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
Documentation/ABI/testing/sysfs-class-rc-nuvoton Normal file
View File

@ -0,0 +1,15 @@
What: /sys/class/rc/rcN/wakeup_data
Date: Mar 2016
KernelVersion: 4.6
Contact: Mauro Carvalho Chehab <m.chehab@samsung.com>
Description:
Reading this file returns the stored CIR wakeup sequence.
It starts with a pulse, followed by a space, pulse etc.
All values are in microseconds.
The same format can be used to store a wakeup sequence
in the Nuvoton chip by writing to this file.
Note: Some systems reset the stored wakeup sequence to a
factory default on each boot. On such systems store the
wakeup sequence in a file and set it on boot using e.g.
a udev rule.

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

@ -179,55 +179,74 @@ 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)
static ssize_t wakeup_data_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
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;
int fifo_len, duration;
unsigned long flags;
ssize_t buf_len = 0;
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;
fifo_len = min(fifo_len, WAKEUP_MAX_SIZE);
/* go to first element to be read */
while (nvt_cir_wake_reg_read(nvt, CIR_WAKE_RD_FIFO_ONLY_IDX) != off)
while (nvt_cir_wake_reg_read(nvt, CIR_WAKE_RD_FIFO_ONLY_IDX))
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);
for (i = 0; i < fifo_len; i++) {
duration = nvt_cir_wake_reg_read(nvt, CIR_WAKE_RD_FIFO_ONLY);
duration = (duration & BUF_LEN_MASK) * SAMPLE_PERIOD;
buf_len += snprintf(buf + buf_len, PAGE_SIZE - buf_len,
"%d ", duration);
}
buf_len += snprintf(buf + buf_len, PAGE_SIZE - buf_len, "\n");
spin_unlock_irqrestore(&nvt->nvt_lock, flags);
return len;
return buf_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)
static ssize_t wakeup_data_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
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;
u8 tolerance, config, wake_buf[WAKEUP_MAX_SIZE];
char **argv;
int i, count;
unsigned int val;
ssize_t ret;
if (off > 0)
return -EINVAL;
argv = argv_split(GFP_KERNEL, buf, &count);
if (!argv)
return -ENOMEM;
if (!count || count > WAKEUP_MAX_SIZE) {
ret = -EINVAL;
goto out;
}
for (i = 0; i < count; i++) {
ret = kstrtouint(argv[i], 10, &val);
if (ret)
goto out;
val = DIV_ROUND_CLOSEST(val, SAMPLE_PERIOD);
if (!val || val > 0x7f) {
ret = -EINVAL;
goto out;
}
wake_buf[i] = val;
/* sequence must start with a pulse */
if (i % 2 == 0)
wake_buf[i] |= BUF_PULSE_BIT;
}
/* hardcode the tolerance to 10% */
tolerance = DIV_ROUND_UP(count, 10);
@ -245,16 +264,18 @@ static ssize_t wakeup_data_write(struct file *fp, struct kobject *kobj,
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, wake_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;
ret = len;
out:
argv_free(argv);
return ret;
}
static BIN_ATTR_RW(wakeup_data, WAKEUP_MAX_SIZE);
static DEVICE_ATTR_RW(wakeup_data);
/* dump current cir register contents */
static void cir_dump_regs(struct nvt_dev *nvt)
@ -1212,7 +1233,7 @@ 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);
ret = device_create_file(&rdev->dev, &dev_attr_wakeup_data);
if (ret)
goto exit_unregister_device;
@ -1239,7 +1260,7 @@ 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);
device_remove_file(&nvt->rdev->dev, &dev_attr_wakeup_data);
nvt_disable_cir(nvt);