The following patched add suspend/resume support to all echoaudio drivers. They seem to work fine, but more testing is needed. Some testing have been performed on an IndigoIOx and a Layla3G (thanks to Mark Hills). The most important part which has not been tested is rawmidi.

Is someone willing to try ? The following patches are against alsa-driver-1.0.22.1, but should be possible to apply them cleanly on other versions as well because no changes have been done recently.

1/4 Add firmware cache #1: When CONFIG_PM is enabled the firmware cannot be released because the driver may need it again to resume the card. With this patch the firmware is passed as an index of the struct firmware card_fw[] in place of a pointer. That same index is then uses to locate the firmware in the firmware cache.

2/4 Add firmware cache #2: This patch changes get_firmware(), free_firmware() and adds free_firmware_cache(). The first two functions implement a very simple cache and the latter is used to actually release all the stored firmwares when the module is unloaded. When CONFIG_PM is not enabled those functions act as before and free_firmware_cache() is a nop.

3/4 Add suspend support: This patch adds snd_echo_suspend() and snd_echo_resume() callbacks and suspend/resume trigger event handlers. It also makes hardware initialization and mixer setup two clearly distinct stages, so they can be used also in the resume procedure without messing the settings up. As a bonus all init_hw() functions (one for each card) are a little shorter and cleaner.

4/4 patch the patch: Updates pci/echoaudio/echoaudio.patch

The patches are here, in the same order as above:

http://www.webalice.it/g_pochini/ead/fw_cache_1.patch http://www.webalice.it/g_pochini/ead/fw_cache_2.patch http://www.webalice.it/g_pochini/ead/pm_suspend_10.patch http://www.webalice.it/g_pochini/ead/echoaudio.patch.patch

Or if you prefer a single patch (54KB):

http://www.webalice.it/g_pochini/ead/all_echoaudio_suspend.patch

Please test and report, especially the rawmidi part. TIA.