suspend & resume implementations
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serifpersia
parent
76a3719cf9
commit
df642295da
107
us144mkii.c
107
us144mkii.c
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@ -21,9 +21,20 @@ MODULE_LICENSE("GPL");
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#define DRIVER_NAME "snd-usb-us144mkii"
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/*
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* TODO:
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* - Implement audio input capture.
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* - Implement MIDI IN/OUT.
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* - Expose hardware features via the ALSA Control API (mixers):
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* - Digital output format selection.
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*/
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/* --- Module Parameters --- */
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
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static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
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static bool enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
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static int dev_idx;
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module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for the US-144MKII soundcard.");
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@ -41,7 +52,7 @@ MODULE_PARM_DESC(enable, "Enable this US-144MKII soundcard.");
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#define EP_AUDIO_OUT 0x02
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#define EP_MIDI_IN 0x83
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#define EP_MIDI_OUT 0x04
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#define EP_CAPTURE_DATA 0x86
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#define EP_AUDIO_IN 0x86
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/* --- USB Control Message Protocol --- */
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#define RT_H2D_CLASS_EP (USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_ENDPOINT)
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@ -83,6 +94,16 @@ MODULE_PARM_DESC(enable, "Enable this US-144MKII soundcard.");
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struct tascam_card;
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static struct usb_driver tascam_alsa_driver;
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/* --- Forward Declarations --- */
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static void playback_urb_complete(struct urb *urb);
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static void feedback_urb_complete(struct urb *urb);
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static int us144mkii_configure_device_for_rate(struct tascam_card *tascam, int rate);
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static int tascam_probe(struct usb_interface *intf, const struct usb_device_id *id);
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static void tascam_disconnect(struct usb_interface *intf);
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static int tascam_suspend(struct usb_interface *intf, pm_message_t message);
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static int tascam_resume(struct usb_interface *intf);
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/* --- Rate-to-Packet Fixing Data --- */
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static const unsigned int patterns_48khz[5][8] = {
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{5, 6, 6, 6, 5, 6, 6, 6}, {5, 6, 6, 6, 6, 6, 6, 6},
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{6, 6, 6, 6, 6, 6, 6, 6}, {7, 6, 6, 6, 6, 6, 6, 6},
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@ -104,6 +125,7 @@ static const unsigned int patterns_44khz[5][8] = {
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{6, 6, 6, 5, 6, 6, 6, 5}
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};
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/* --- Main Driver Data Structure --- */
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struct tascam_card {
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struct usb_device *dev;
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struct usb_interface *iface0;
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@ -141,9 +163,6 @@ struct tascam_card {
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static const unsigned int playback_iso_packet_counts_tiers[] = { 8, 24, 40 };
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static const unsigned int hardware_feedback_packet_counts[] = { 1, 2, 5 };
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static void playback_urb_complete(struct urb *urb);
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static void feedback_urb_complete(struct urb *urb);
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static const struct snd_pcm_hardware tascam_pcm_hw = {
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.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID |
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@ -312,7 +331,7 @@ static int us144mkii_configure_device_for_rate(struct tascam_card *tascam, int r
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), VENDOR_REQ_MODE_CONTROL, RT_H2D_VENDOR_DEV, MODE_VAL_CONFIG, 0x0000, NULL, 0, USB_CTRL_TIMEOUT_MS);
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if (err < 0) goto fail;
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, RT_H2D_CLASS_EP, UAC_SAMPLING_FREQ_CONTROL, EP_CAPTURE_DATA, rate_payload_buf, 3, USB_CTRL_TIMEOUT_MS);
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, RT_H2D_CLASS_EP, UAC_SAMPLING_FREQ_CONTROL, EP_AUDIO_IN, rate_payload_buf, 3, USB_CTRL_TIMEOUT_MS);
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if (err < 0) goto fail;
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, RT_H2D_CLASS_EP, UAC_SAMPLING_FREQ_CONTROL, EP_AUDIO_OUT, rate_payload_buf, 3, USB_CTRL_TIMEOUT_MS);
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if (err < 0) goto fail;
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@ -687,13 +706,87 @@ static void tascam_card_private_free(struct snd_card *card)
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}
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}
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/**
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* tascam_suspend - Called when the device is being suspended.
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* @intf: The USB interface.
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* @message: Power management message.
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*
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* Stops all active audio streams to prepare for system sleep.
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*
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* Returns: 0 on success.
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*/
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static int tascam_suspend(struct usb_interface *intf, pm_message_t message)
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{
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struct tascam_card *tascam = usb_get_intfdata(intf);
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if (!tascam || !tascam->pcm)
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return 0;
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snd_pcm_suspend_all(tascam->pcm);
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return 0;
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}
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/**
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* tascam_resume - Called when the device is being resumed.
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* @intf: The USB interface.
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*
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* Re-initializes the device hardware after system resume, restoring its
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* alternate settings and sample rate configuration. This is necessary because
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* the device may lose its state during suspend.
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*
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* Returns: 0 on success, or a negative error code on failure.
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*/
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static int tascam_resume(struct usb_interface *intf)
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{
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struct tascam_card *tascam = usb_get_intfdata(intf);
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struct usb_device *dev;
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int err;
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if (!tascam)
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return 0;
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dev = tascam->dev;
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dev_info(&intf->dev, "Resuming and re-initializing device...\n");
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/* Re-establish alternate settings for both interfaces */
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err = usb_set_interface(dev, 0, 1);
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if (err < 0) {
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dev_err(&intf->dev, "Resume: Set Alt Setting on Intf 0 failed: %d\n", err);
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return err;
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}
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err = usb_set_interface(dev, 1, 1);
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if (err < 0) {
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dev_err(&intf->dev, "Resume: Set Alt Setting on Intf 1 failed: %d\n", err);
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return err;
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}
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/*
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* Re-configure the device for the last used sample rate.
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* If no stream was ever started, current_rate will be 0, and we skip this.
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* The ALSA core will handle resuming the PCM streams, which will
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* trigger our .prepare and .trigger ops as needed.
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*/
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if (tascam->current_rate > 0) {
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dev_info(&intf->dev, "Restoring sample rate to %d Hz\n", tascam->current_rate);
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err = us144mkii_configure_device_for_rate(tascam, tascam->current_rate);
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if (err < 0) {
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dev_err(&intf->dev, "Resume: Failed to restore sample rate configuration\n");
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/* Invalidate the rate so the next hw_params will re-configure fully. */
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tascam->current_rate = 0;
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return err;
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}
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}
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return 0;
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}
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static int tascam_probe(struct usb_interface *intf, const struct usb_device_id *usb_id)
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{
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struct usb_device *dev = interface_to_usbdev(intf);
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struct tascam_card *tascam;
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struct snd_card *card;
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int err;
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static int dev_idx;
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u8 *handshake_buf;
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if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
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@ -820,6 +913,8 @@ static struct usb_driver tascam_alsa_driver = {
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.probe = tascam_probe,
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.disconnect = tascam_disconnect,
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.id_table = tascam_id_table,
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.suspend = tascam_suspend,
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.resume = tascam_resume,
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};
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module_usb_driver(tascam_alsa_driver);
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