From 9e15fae6c51a362418f8b3054f1322c54675df94 Mon Sep 17 00:00:00 2001 From: "Geoffrey D. Bennett" Date: Wed, 23 Jun 2021 02:32:25 +0930 Subject: [PATCH] ALSA: usb-audio: scarlett2: Allow bit-level access to config Add support for accessing configuration values when multiple values are stored in one byte. Needed by the upcoming Solo and 2i2 Gen 3 support. Signed-off-by: Geoffrey D. Bennett Link: https://lore.kernel.org/r/4e54e9e106ec7029c1a668c51b4fc769a7eb4ed0.1624379707.git.g@b4.vu Signed-off-by: Takashi Iwai --- sound/usb/mixer_scarlett_gen2.c | 68 +++++++++++++++++++++++++++++++++-------- 1 file changed, 55 insertions(+), 13 deletions(-) diff --git a/sound/usb/mixer_scarlett_gen2.c b/sound/usb/mixer_scarlett_gen2.c index 7a5346c..08e7b68 100644 --- a/sound/usb/mixer_scarlett_gen2.c +++ b/sound/usb/mixer_scarlett_gen2.c @@ -814,7 +814,7 @@ enum { }; /* Location, size, and activation command number for the configuration - * parameters + * parameters. Size is in bits and may be 1, 8, or 16. */ struct scarlett2_config { u8 offset; @@ -825,25 +825,25 @@ struct scarlett2_config { static const struct scarlett2_config scarlett2_config_items[SCARLETT2_CONFIG_COUNT] = { [SCARLETT2_CONFIG_DIM_MUTE] = { - .offset = 0x31, .size = 1, .activate = 2 }, + .offset = 0x31, .size = 8, .activate = 2 }, [SCARLETT2_CONFIG_LINE_OUT_VOLUME] = { - .offset = 0x34, .size = 2, .activate = 1 }, + .offset = 0x34, .size = 16, .activate = 1 }, [SCARLETT2_CONFIG_MUTE_SWITCH] = { - .offset = 0x5c, .size = 1, .activate = 1 }, + .offset = 0x5c, .size = 8, .activate = 1 }, [SCARLETT2_CONFIG_SW_HW_SWITCH] = { - .offset = 0x66, .size = 1, .activate = 3 }, + .offset = 0x66, .size = 8, .activate = 3 }, [SCARLETT2_CONFIG_LEVEL_SWITCH] = { - .offset = 0x7c, .size = 1, .activate = 7 }, + .offset = 0x7c, .size = 8, .activate = 7 }, [SCARLETT2_CONFIG_PAD_SWITCH] = { - .offset = 0x84, .size = 1, .activate = 8 }, + .offset = 0x84, .size = 8, .activate = 8 }, [SCARLETT2_CONFIG_MSD_SWITCH] = { - .offset = 0x9d, .size = 1, .activate = 6 }, + .offset = 0x9d, .size = 8, .activate = 6 }, }; /* proprietary request/response format */ @@ -1008,9 +1008,25 @@ static int scarlett2_usb_get_config( { const struct scarlett2_config *config_item = &scarlett2_config_items[config_item_num]; - int size = config_item->size * count; + int size, err, i; + u8 value; - return scarlett2_usb_get(mixer, config_item->offset, buf, size); + /* For byte-sized parameters, retrieve directly into buf */ + if (config_item->size >= 8) { + size = config_item->size / 8 * count; + return scarlett2_usb_get(mixer, config_item->offset, buf, size); + } + + /* For bit-sized parameters, retrieve into value */ + err = scarlett2_usb_get(mixer, config_item->offset, &value, 1); + if (err < 0) + return err; + + /* then unpack from value into buf[] */ + for (i = 0; i < 8 && i < count; i++, value >>= 1) + *(u8 *)buf++ = value & 1; + + return 0; } /* Send SCARLETT2_USB_DATA_CMD SCARLETT2_USB_CONFIG_SAVE */ @@ -1047,18 +1063,44 @@ static int scarlett2_usb_set_config( __le32 value; } __packed req; __le32 req2; + int offset, size; int err; struct scarlett2_data *private = mixer->private_data; /* Cancel any pending NVRAM save */ cancel_delayed_work_sync(&private->work); + /* Convert config_item->size in bits to size in bytes and + * calculate offset + */ + if (config_item->size >= 8) { + size = config_item->size / 8; + offset = config_item->offset + index * size; + + /* If updating a bit, retrieve the old value, set/clear the + * bit as needed, and update value + */ + } else { + u8 tmp; + + size = 1; + offset = config_item->offset; + + scarlett2_usb_get(mixer, offset, &tmp, 1); + if (value) + tmp |= (1 << index); + else + tmp &= ~(1 << index); + + value = tmp; + } + /* Send the configuration parameter data */ - req.offset = cpu_to_le32(config_item->offset + index * config_item->size); - req.bytes = cpu_to_le32(config_item->size); + req.offset = cpu_to_le32(offset); + req.bytes = cpu_to_le32(size); req.value = cpu_to_le32(value); err = scarlett2_usb(mixer, SCARLETT2_USB_SET_DATA, - &req, sizeof(u32) * 2 + config_item->size, + &req, sizeof(u32) * 2 + size, NULL, 0); if (err < 0) return err; -- 2.7.4