diff options
Diffstat (limited to 'drivers/usb/misc/usbsevseg.c')
| -rw-r--r-- | drivers/usb/misc/usbsevseg.c | 69 |
1 files changed, 63 insertions, 6 deletions
diff --git a/drivers/usb/misc/usbsevseg.c b/drivers/usb/misc/usbsevseg.c index 28a6a3a0953..3db255537e7 100644 --- a/drivers/usb/misc/usbsevseg.c +++ b/drivers/usb/misc/usbsevseg.c @@ -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) |