Some devices support fast access to registers using the USB interface
while others require a certain delay after each operation. This commit
adds a quirk that can be enabled by devices that don't need the delay.
Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxxxxxxxxxx>
---
drivers/staging/tm6000/tm6000-core.c | 3 ++-
drivers/staging/tm6000/tm6000.h | 6 ++++++
2 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/drivers/staging/tm6000/tm6000-core.c b/drivers/staging/tm6000/tm6000-core.c
index 64fc1c6..93a0772 100644
--- a/drivers/staging/tm6000/tm6000-core.c
+++ b/drivers/staging/tm6000/tm6000-core.c
@@ -89,7 +89,8 @@ int tm6000_read_write_usb(struct tm6000_core *dev, u8 req_type, u8 req,
kfree(data);
- msleep(5);
+ if ((dev->quirks & TM6000_QUIRK_NO_USB_DELAY) == 0)
+ msleep(5);
mutex_unlock(&dev->usb_lock);
return ret;
diff --git a/drivers/staging/tm6000/tm6000.h b/drivers/staging/tm6000/tm6000.h
index dac2063..0e35812 100644
--- a/drivers/staging/tm6000/tm6000.h
+++ b/drivers/staging/tm6000/tm6000.h
@@ -169,6 +169,10 @@ struct tm6000_endpoint {
unsigned maxsize;
};
+enum {
+ TM6000_QUIRK_NO_USB_DELAY,
+};
+
struct tm6000_core {
/* generic device properties */
char name[30]; /* name (including minor) of the device */
@@ -260,6 +264,8 @@ struct tm6000_core {
struct usb_isoc_ctl isoc_ctl;
spinlock_t slock;
+
+ unsigned long quirks;
};
enum tm6000_ops_type {
--
1.7.6.1
--
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