Re: [PATCH v5] ALSA: hda/tas2781: Add speaker id check for ASUS projects

From: Andy Shevchenko
Date: Mon Nov 18 2024 - 04:14:32 EST


On Sat, Nov 16, 2024 at 03:50:06PM +0800, Baojun Xu wrote:
> Add speaker id check by gpio in ACPI for ASUS projects.
> In other vendors, speaker id was checked by BIOS, and was applied in
> last bit of subsys id, so we can load corresponding firmware binary file
> for its speaker by subsys id.
> But in ASUS project, the firmware binary name will be appended an extra
> number to tell the speakers from different vendors. And this single digit
> come from gpio level of speaker id in BIOS.

...

> + // Speaker id was needed for ASUS projects.
> + if (!strncmp(sub, TAS2781_ASUS_ID, strlen(TAS2781_ASUS_ID))) {

Better approach is

ret = sscanf(sub, "%04x%04x", &vid, &did);
if (ret == 2 && vid == ASUS_ID) {
... // matched to ASUS_ID
} else {
... // no match
}

Alternatively it can be

u32 subid;

ret = kstrtou32(sub, 16, &subid);
if (ret || upper_16_bits(subid) != ASUS_ID) {
... // no match (as in previous 'else')
} else {
... // matched to ASUS_ID
}

With it it will be clearer to see what's going on here.

With the above you can get rid of the custom constant and
use PCI_VENDOR_ID_ASUSTEK directly.

--
With Best Regards,
Andy Shevchenko