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ALSA: scarlett2: Add support for uploading new firmware

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Add ops.write to the hwdep interface. Once the upgrade firmware flash
segment has been erased, writes to the hwdep fd are permitted, and
translated to SCARLETT2_USB_WRITE_SEGMENT commands to the device.

Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
Link: https://lore.kernel.org/r/ZY65S0ojShSNSeRQ@m.b4.vu
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Geoffrey D. Bennett 2023-12-29 22:49:23 +10:30 committed by Takashi Iwai
parent 6a7508e64e
commit 1abfbd3c95
1 changed files with 93 additions and 3 deletions
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96
sound/usb/mixer_scarlett2.c
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@ -266,7 +266,8 @@ enum {
enum {
SCARLETT2_FLASH_WRITE_STATE_IDLE = 0,
SCARLETT2_FLASH_WRITE_STATE_SELECTED = 1,
SCARLETT2_FLASH_WRITE_STATE_ERASING = 2
SCARLETT2_FLASH_WRITE_STATE_ERASING = 2,
SCARLETT2_FLASH_WRITE_STATE_WRITE = 3
};
static const char *const scarlett2_dim_mute_names[SCARLETT2_DIM_MUTE_COUNT] = {
@ -1176,6 +1177,7 @@ static int scarlett2_get_port_start_num(
#define SCARLETT2_USB_METER_LEVELS_GET_MAGIC 1
#define SCARLETT2_FLASH_BLOCK_SIZE 4096
#define SCARLETT2_FLASH_WRITE_MAX 1024
#define SCARLETT2_SEGMENT_NUM_MIN 1
#define SCARLETT2_SEGMENT_NUM_MAX 4
@ -5079,10 +5081,10 @@ static int scarlett2_ioctl_get_erase_progress(
return -EFAULT;
/* If the erase is complete, change the state from ERASING to
* IDLE.
* WRITE.
*/
if (progress.progress == 0xff)
private->flash_write_state = SCARLETT2_FLASH_WRITE_STATE_IDLE;
private->flash_write_state = SCARLETT2_FLASH_WRITE_STATE_WRITE;
return 0;
}
@ -5135,6 +5137,93 @@ static int scarlett2_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
}
}
static long scarlett2_hwdep_write(struct snd_hwdep *hw,
const char __user *buf,
long count, loff_t *offset)
{
struct usb_mixer_interface *mixer = hw->private_data;
struct scarlett2_data *private = mixer->private_data;
int segment_id, segment_num, err, len;
int flash_size;
/* SCARLETT2_USB_WRITE_SEGMENT request data */
struct {
__le32 segment_num;
__le32 offset;
__le32 pad;
u8 data[];
} __packed *req;
/* Calculate the maximum permitted in data[] */
const size_t max_data_size = SCARLETT2_FLASH_WRITE_MAX -
offsetof(typeof(*req), data);
/* If erasing, wait for it to complete */
if (private->flash_write_state ==
SCARLETT2_FLASH_WRITE_STATE_ERASING) {
err = scarlett2_wait_for_erase(mixer);
if (err < 0)
return err;
private->flash_write_state = SCARLETT2_FLASH_WRITE_STATE_WRITE;
/* Check that an erase has been done & completed */
} else if (private->flash_write_state !=
SCARLETT2_FLASH_WRITE_STATE_WRITE) {
return -EINVAL;
}
/* Check that we're writing to the upgrade firmware */
segment_id = private->selected_flash_segment_id;
if (segment_id != SCARLETT2_SEGMENT_ID_FIRMWARE)
return -EINVAL;
segment_num = private->flash_segment_nums[segment_id];
if (segment_num < SCARLETT2_SEGMENT_NUM_MIN ||
segment_num > SCARLETT2_SEGMENT_NUM_MAX)
return -EFAULT;
/* Validate the offset and count */
flash_size = private->flash_segment_blocks[segment_id] *
SCARLETT2_FLASH_BLOCK_SIZE;
if (count < 0 || *offset < 0 || *offset + count >= flash_size)
return -EINVAL;
if (!count)
return 0;
/* Limit the *req size to SCARLETT2_FLASH_WRITE_MAX */
if (count > max_data_size)
count = max_data_size;
/* Create and send the request */
len = struct_size(req, data, count);
req = kzalloc(len, GFP_KERNEL);
if (!req)
return -ENOMEM;
req->segment_num = cpu_to_le32(segment_num);
req->offset = cpu_to_le32(*offset);
req->pad = 0;
if (copy_from_user(req->data, buf, count)) {
err = -EFAULT;
goto error;
}
err = scarlett2_usb(mixer, SCARLETT2_USB_WRITE_SEGMENT,
req, len, NULL, 0);
if (err < 0)
goto error;
*offset += count;
err = count;
error:
kfree(req);
return err;
}
static int scarlett2_hwdep_release(struct snd_hwdep *hw, struct file *file)
{
struct usb_mixer_interface *mixer = hw->private_data;
@ -5164,6 +5253,7 @@ static int scarlett2_hwdep_init(struct usb_mixer_interface *mixer)
hw->exclusive = 1;
hw->ops.open = scarlett2_hwdep_open;
hw->ops.ioctl = scarlett2_hwdep_ioctl;
hw->ops.write = scarlett2_hwdep_write;
hw->ops.release = scarlett2_hwdep_release;
return 0;