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USB: full autosuspend and power management support for usbsevseg

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This patch adds to the usbsevseg driver:

- suspend/resume support
- reset_resume support
- autosuspend using the display's power state to determine idleness

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Harrison Metzger <harrisonmetz@gmail.com>
This commit is contained in:
Oliver Neukum 2009-07-13 16:45:47 +02:00 committed by Greg Kroah-Hartman
parent d9bfbd167b
commit 4d155eb5f5
1 changed files with 63 additions and 6 deletions
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69
drivers/usb/misc/usbsevseg.c
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@ -38,6 +38,7 @@ static char *display_textmodes[] = {"raw", "hex", "ascii", NULL};
struct usb_sevsegdev {
struct usb_device *udev;
struct usb_interface *intf;
u8 powered;
u8 mode_msb;
@ -46,6 +47,8 @@ struct usb_sevsegdev {
u8 textmode;
u8 text[MAXLEN];
u16 textlength;
u8 shadow_power; /* for PM */
};
/* sysfs_streq can't replace this completely
@ -65,6 +68,12 @@ static void update_display_powered(struct usb_sevsegdev *mydev)
{
int rc;
if (!mydev->shadow_power && mydev->powered) {
rc = usb_autopm_get_interface(mydev->intf);
if (rc < 0)
return;
}
rc = usb_control_msg(mydev->udev,
usb_sndctrlpipe(mydev->udev, 0),
0x12,
@ -76,12 +85,18 @@ static void update_display_powered(struct usb_sevsegdev *mydev)
2000);
if (rc < 0)
dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc);
if (mydev->shadow_power && !mydev->powered)
usb_autopm_put_interface(mydev->intf);
}
static void update_display_mode(struct usb_sevsegdev *mydev)
{
int rc;
if(mydev->shadow_power != 1)
return;
rc = usb_control_msg(mydev->udev,
usb_sndctrlpipe(mydev->udev, 0),
0x12,
@ -96,14 +111,17 @@ static void update_display_mode(struct usb_sevsegdev *mydev)
dev_dbg(&mydev->udev->dev, "mode retval = %d\n", rc);
}
static void update_display_visual(struct usb_sevsegdev *mydev)
static void update_display_visual(struct usb_sevsegdev *mydev, gfp_t mf)
{
int rc;
int i;
unsigned char *buffer;
u8 decimals = 0;
buffer = kzalloc(MAXLEN, GFP_KERNEL);
if(mydev->shadow_power != 1)
return;
buffer = kzalloc(MAXLEN, mf);
if (!buffer) {
dev_err(&mydev->udev->dev, "out of memory\n");
return;
@ -163,7 +181,7 @@ static ssize_t set_attr_##name(struct device *dev, \
struct usb_sevsegdev *mydev = usb_get_intfdata(intf); \
\
mydev->name = simple_strtoul(buf, NULL, 10); \
update_fcn(mydev); \
update_fcn(mydev); \
\
return count; \
} \
@ -194,7 +212,7 @@ static ssize_t set_attr_text(struct device *dev,
if (end > 0)
memcpy(mydev->text, buf, end);
update_display_visual(mydev);
update_display_visual(mydev, GFP_KERNEL);
return count;
}
@ -242,7 +260,7 @@ static ssize_t set_attr_decimals(struct device *dev,
if (buf[i] == '1')
mydev->decimals[end-1-i] = 1;
update_display_visual(mydev);
update_display_visual(mydev, GFP_KERNEL);
return count;
}
@ -286,7 +304,7 @@ static ssize_t set_attr_textmode(struct device *dev,
for (i = 0; display_textmodes[i]; i++) {
if (sysfs_streq(display_textmodes[i], buf)) {
mydev->textmode = i;
update_display_visual(mydev);
update_display_visual(mydev, GFP_KERNEL);
return count;
}
}
@ -330,6 +348,7 @@ static int sevseg_probe(struct usb_interface *interface,
}
mydev->udev = usb_get_dev(udev);
mydev->intf = interface;
usb_set_intfdata(interface, mydev);
/*set defaults */
@ -364,11 +383,49 @@ static void sevseg_disconnect(struct usb_interface *interface)
dev_info(&interface->dev, "USB 7 Segment now disconnected\n");
}
static int sevseg_suspend(struct usb_interface *intf, pm_message_t message)
{
struct usb_sevsegdev *mydev;
mydev = usb_get_intfdata(intf);
mydev->shadow_power = 0;
return 0;
}
static int sevseg_resume(struct usb_interface *intf)
{
struct usb_sevsegdev *mydev;
mydev = usb_get_intfdata(intf);
mydev->shadow_power = 1;
update_display_mode(mydev);
update_display_visual(mydev, GFP_NOIO);
return 0;
}
static int sevseg_reset_resume(struct usb_interface *intf)
{
struct usb_sevsegdev *mydev;
mydev = usb_get_intfdata(intf);
mydev->shadow_power = 1;
update_display_mode(mydev);
update_display_visual(mydev, GFP_NOIO);
return 0;
}
static struct usb_driver sevseg_driver = {
.name = "usbsevseg",
.probe = sevseg_probe,
.disconnect = sevseg_disconnect,
.suspend = sevseg_suspend,
.resume = sevseg_resume,
.reset_resume = sevseg_reset_resume,
.id_table = id_table,
.supports_autosuspend = 1,
};
static int __init usb_sevseg_init(void)