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HID: split picolcd's operation_mode sysfs attribute 

Original operation_mode sysfs attribute accepts the operation mode
as main value with an option delay as second value to change
the start-up delay on mode change.

As it is preferred to have exactly one value per sysfs attribute,
extract this delay into a separate sysfs attribute called
operation_mode_delay.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Bruno Prémont 2010-04-25 21:29:16 +02:00 committed by Jiri Kosina
parent 76d17e6ca3
commit 0b5adf92ec
2 changed files with 58 additions and 21 deletions
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17
Documentation/ABI/testing/sysfs-driver-hid-picolcd
View File

@ -8,12 +8,21 @@ Description: Make it possible to switch the PicoLCD device between LCD
enclosed in brackets ('[' and ']')
Writing: causes operation mode switch. Permitted values are
the non-active mode names listed when read, optionally followed
by a delay value expressed in ms.
the non-active mode names listed when read.
Note: when switching mode the current PicoLCD HID device gets
disconnected and reconnects after above delay (default value
is 5 seconds though this default should not be relied on).
disconnected and reconnects after above delay (see attribute
operation_mode_delay for its value).
What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/operation_mode_delay
Date: April 2010
Contact: Bruno Prémont <bonbons@linux-vserver.org>
Description: Delay PicoLCD waits before restarting in new mode when
operation_mode has changed.
Reading/Writing: It is expressed in ms and permitted range is
0..30000ms.
What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/fb_update_rate

62
drivers/hid/hid-picolcd.c
View File

@ -177,6 +177,7 @@ struct picolcd_data {
int addr_sz;
#endif
u8 version[2];
unsigned short opmode_delay;
/* input stuff */
u8 pressed_keys[2];
struct input_dev *input_keys;
@ -1270,8 +1271,7 @@ static ssize_t picolcd_operation_mode_store(struct device *dev,
struct picolcd_data *data = dev_get_drvdata(dev);
struct hid_report *report = NULL;
size_t cnt = count;
int timeout = 5000;
unsigned u;
int timeout = data->opmode_delay;
unsigned long flags;
if (cnt >= 3 && strncmp("lcd", buf, 3) == 0) {
@ -1288,20 +1288,10 @@ static ssize_t picolcd_operation_mode_store(struct device *dev,
if (!report)
return -EINVAL;
while (cnt > 0 && (*buf == ' ' || *buf == '\t')) {
buf++;
cnt--;
}
while (cnt > 0 && (buf[cnt-1] == '\n' || buf[cnt-1] == '\r'))
cnt--;
if (cnt > 0) {
if (sscanf(buf, "%u", &u) != 1)
return -EINVAL;
if (u > 30000)
return -EINVAL;
else
timeout = u;
}
if (cnt != 0)
return -EINVAL;
spin_lock_irqsave(&data->lock, flags);
hid_set_field(report->field[0], 0, timeout & 0xff);
@ -1314,6 +1304,34 @@ static ssize_t picolcd_operation_mode_store(struct device *dev,
static DEVICE_ATTR(operation_mode, 0644, picolcd_operation_mode_show,
picolcd_operation_mode_store);
/*
* The "operation_mode_delay" sysfs attribute
*/
static ssize_t picolcd_operation_mode_delay_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct picolcd_data *data = dev_get_drvdata(dev);
return snprintf(buf, PAGE_SIZE, "%hu\n", data->opmode_delay);
}
static ssize_t picolcd_operation_mode_delay_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct picolcd_data *data = dev_get_drvdata(dev);
unsigned u;
if (sscanf(buf, "%u", &u) != 1)
return -EINVAL;
if (u > 30000)
return -EINVAL;
else
data->opmode_delay = u;
return count;
}
static DEVICE_ATTR(operation_mode_delay, 0644, picolcd_operation_mode_delay_show,
picolcd_operation_mode_delay_store);
#ifdef CONFIG_DEBUG_FS
/*
@ -2409,6 +2427,7 @@ static int picolcd_probe(struct hid_device *hdev,
spin_lock_init(&data->lock);
mutex_init(&data->mutex);
data->hdev = hdev;
data->opmode_delay = 5000;
if (hdev->product == USB_DEVICE_ID_PICOLCD_BOOTLOADER)
data->status |= PICOLCD_BOOTLOADER;
hid_set_drvdata(hdev, data);
@ -2436,24 +2455,32 @@ static int picolcd_probe(struct hid_device *hdev,
goto err_cleanup_hid_hw;
}
error = device_create_file(&hdev->dev, &dev_attr_operation_mode);
error = device_create_file(&hdev->dev, &dev_attr_operation_mode_delay);
if (error) {
dev_err(&hdev->dev, "failed to create sysfs attributes\n");
goto err_cleanup_hid_ll;
}
error = device_create_file(&hdev->dev, &dev_attr_operation_mode);
if (error) {
dev_err(&hdev->dev, "failed to create sysfs attributes\n");
goto err_cleanup_sysfs1;
}
if (data->status & PICOLCD_BOOTLOADER)
error = picolcd_probe_bootloader(hdev, data);
else
error = picolcd_probe_lcd(hdev, data);
if (error)
goto err_cleanup_sysfs;
goto err_cleanup_sysfs2;
dbg_hid(PICOLCD_NAME " activated and initialized\n");
return 0;
err_cleanup_sysfs:
err_cleanup_sysfs2:
device_remove_file(&hdev->dev, &dev_attr_operation_mode);
err_cleanup_sysfs1:
device_remove_file(&hdev->dev, &dev_attr_operation_mode_delay);
err_cleanup_hid_ll:
hdev->ll_driver->close(hdev);
err_cleanup_hid_hw:
@ -2478,6 +2505,7 @@ static void picolcd_remove(struct hid_device *hdev)
picolcd_exit_devfs(data);
device_remove_file(&hdev->dev, &dev_attr_operation_mode);
device_remove_file(&hdev->dev, &dev_attr_operation_mode_delay);
hdev->ll_driver->close(hdev);
hid_hw_stop(hdev);
hid_set_drvdata(hdev, NULL);