On Wed, Oct 26, 2016 at 09:57:34PM +0100, Nick Dyer wrote:
> We have encountered some RMI4 firmwares where there are blank pages in
> between PDT pages which contain functions. This change makes them
> correctly enumerate all functions on the device.
>
> Tested on S7817 (has empty page 2).
>
> Signed-off-by: Nick Dyer <nick@xxxxxxxxxxxxx>
> [Tested successfully on S7817 and S7300 Synaptics touch controllers]
> Tested-by: Chris Healy <cphealy@xxxxxxxxx>
> Reviewed-by: Andrew Duggan <aduggan@xxxxxxxxxxxxx>
Applied, thank you.
> ---
> drivers/input/rmi4/rmi_driver.c | 16 ++++++++++++++--
> 1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
> index 4a88312..425bd19 100644
> --- a/drivers/input/rmi4/rmi_driver.c
> +++ b/drivers/input/rmi4/rmi_driver.c
> @@ -422,6 +422,7 @@ static void rmi_driver_copy_pdt_to_fd(const struct pdt_entry *pdt,
>
> static int rmi_scan_pdt_page(struct rmi_device *rmi_dev,
> int page,
> + int *empty_pages,
> void *ctx,
> int (*callback)(struct rmi_device *rmi_dev,
> void *ctx,
> @@ -449,7 +450,16 @@ static int rmi_scan_pdt_page(struct rmi_device *rmi_dev,
> return retval;
> }
>
> - return (data->f01_bootloader_mode || addr == pdt_start) ?
> + /*
> + * Count number of empty PDT pages. If a gap of two pages
> + * or more is found, stop scanning.
> + */
> + if (addr == pdt_start)
> + ++*empty_pages;
> + else
> + *empty_pages = 0;
> +
> + return (data->f01_bootloader_mode || *empty_pages >= 2) ?
> RMI_SCAN_DONE : RMI_SCAN_CONTINUE;
> }
>
> @@ -459,10 +469,12 @@ static int rmi_scan_pdt(struct rmi_device *rmi_dev, void *ctx,
> const struct pdt_entry *entry))
> {
> int page;
> + int empty_pages = 0;
> int retval = RMI_SCAN_DONE;
>
> for (page = 0; page <= RMI4_MAX_PAGE; page++) {
> - retval = rmi_scan_pdt_page(rmi_dev, page, ctx, callback);
> + retval = rmi_scan_pdt_page(rmi_dev, page, &empty_pages,
> + ctx, callback);
> if (retval != RMI_SCAN_CONTINUE)
> break;
> }
> --
> 2.7.4
>
--
Dmitry
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