Hi,
On 3/4/24 23:17, Armin Wolf wrote:
> The ACPI EC address space handler currently only supports
> reading/writing 8 bit values. Some firmware implementations however
> want to access for example 16 bit values, which is prefectly legal
> according to the ACPI spec.
>
> Add support for reading/writing such values.
>
> Tested on a Dell Inspiron 3505 and a Asus Prime B650-Plus.
>
> Signed-off-by: Armin Wolf <W_Armin@xxxxxx>
Thanks, patch looks good to me:
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Regards,
Hans
> ---
> drivers/platform/x86/wmi.c | 44 +++++++++++++++++++++++++++++---------
> 1 file changed, 34 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
> index 1920e115da89..900e0e52a5fa 100644
> --- a/drivers/platform/x86/wmi.c
> +++ b/drivers/platform/x86/wmi.c
> @@ -1153,6 +1153,32 @@ static int parse_wdg(struct device *wmi_bus_dev, struct platform_device *pdev)
> return 0;
> }
>
> +static int ec_read_multiple(u8 address, u8 *buffer, size_t bytes)
> +{
> + int i, ret;
> +
> + for (i = 0; i < bytes; i++) {
> + ret = ec_read(address + i, &buffer[i]);
> + if (ret < 0)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int ec_write_multiple(u8 address, u8 *buffer, size_t bytes)
> +{
> + int i, ret;
> +
> + for (i = 0; i < bytes; i++) {
> + ret = ec_write(address + i, buffer[i]);
> + if (ret < 0)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> /*
> * WMI can have EmbeddedControl access regions. In which case, we just want to
> * hand these off to the EC driver.
> @@ -1162,27 +1188,25 @@ acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address,
> u32 bits, u64 *value,
> void *handler_context, void *region_context)
> {
> - int result = 0;
> - u8 temp = 0;
> + int bytes = bits / 8;
> + int ret;
>
> - if ((address > 0xFF) || !value)
> + if (address > 0xFF || !value)
> return AE_BAD_PARAMETER;
>
> - if (function != ACPI_READ && function != ACPI_WRITE)
> + if (bytes > sizeof(*value))
> return AE_BAD_PARAMETER;
>
> - if (bits != 8)
> + if (function != ACPI_READ && function != ACPI_WRITE)
> return AE_BAD_PARAMETER;
>
> if (function == ACPI_READ) {
> - result = ec_read(address, &temp);
> - *value = temp;
> + ret = ec_read_multiple(address, (u8 *)value, bytes);
> } else {
> - temp = 0xff & *value;
> - result = ec_write(address, temp);
> + ret = ec_write_multiple(address, (u8 *)value, bytes);
> }
>
> - switch (result) {
> + switch (ret) {
> case -EINVAL:
> return AE_BAD_PARAMETER;
> case -ENODEV:
> --
> 2.39.2
>
