[PATCH i-g-t v4 1/3] lib/igt_kms: Move backlight read and write to lib

[Reddy Guddati, Santhosh]

On 24-10-2024 12:05, Thasleem, Mohammed wrote:
> 
> On 10/24/2024 10:22 AM, Santhosh Reddy Guddati wrote:
>> move backlight_read and backlight_write functions from
>> kms_pm_backlight to library to reuse in other tests.
>>
>> move and rename struct context to intel_backlight_context_t.
>> -->Please format discription correctly and start new line with capital.
>>
>> v2: Rename backlight_read to igt_backlight_read and backlight_write to
>> backlight_write (Suraj).
>> Add a new member to intel_backlight_context_t to cache vendor specific
>> backlight path.
>>     -->please allin above line with v2
		Hi Thasleem,
	Thanks for the feedback, I will make sure to update the 	 
description while merging
>>
>>
>> Signed-off-by: Santhosh Reddy Guddati <santhosh.reddy.guddati at intel.com>
>> Reviewed-by: Suraj Kandpal <suraj.kandpal at intel.com>
>> ---
>>   lib/igt_kms.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++
>>   lib/igt_kms.h | 12 ++++++++++
>>   2 files changed, 78 insertions(+)
>>
>> diff --git a/lib/igt_kms.c b/lib/igt_kms.c
>> index bb35d4b82..5d8096a17 100644
>> --- a/lib/igt_kms.c
>> +++ b/lib/igt_kms.c
>> @@ -7119,3 +7119,69 @@ void igt_reset_link_params(int drm_fd, 
>> igt_output_t *output)
>>       temp = drmModeGetConnector(drm_fd, output->config.connector- 
>> >connector_id);
>>       drmModeFreeConnector(temp);
>>   }
>> +
>> +/**
>> + * igt_backlight_read:
>> + * @result:    Pointer to store the result
>> + * @fname:    Name of the file to read
>> + * @context:    Pointer to the context structure
>> + */
>> +int igt_backlight_read(int *result, const char *fname, 
>> igt_backlight_context_t *context)
>> +{
>> +    int fd;
>> +    char full[PATH_MAX];
>> +    char dst[64];
>> +    int r, e;
>> +
>> +    igt_assert(snprintf(full, PATH_MAX, "%s/%s/%s",
>> +                context->backlight_dir_path,
>> +                context->path,
>> +                fname) < PATH_MAX);
>> +
>> +    fd = open(full, O_RDONLY);
>> +    if (fd == -1)
>> +        return -errno;
>> +
>> +    r = read(fd, dst, sizeof(dst));
>> +    e = errno;
>> +    close(fd);
>> +
>> +    if (r < 0)
>> +        return -e;
>> +
>> +    errno = 0;
>> +    *result = strtol(dst, NULL, 10);
>> +    return errno;
>> +}
>> +
>> +/**
>> + * igt_backlight_write:
>> + * @value:        Value to write
>> + * @fname:        Name of the file to write
>> + * @context:    Pointer to the context structure
>> + */
>> +int igt_backlight_write(int value, const char *fname, 
>> igt_backlight_context_t *context)
>> +{
>> +    int fd;
>> +    char full[PATH_MAX];
>> +    char src[64];
>> +    int len;
>> +
>> +    igt_assert(snprintf(full, PATH_MAX, "%s/%s/%s",
>> +                context->backlight_dir_path,
>> +                context->path,
>> +                fname) < PATH_MAX);
>> +
>> +    fd = open(full, O_WRONLY);
>> +    if (fd == -1)
>> +        return -errno;
>> +
>> +    len = snprintf(src, sizeof(src), "%i", value);
>> +    len = write(fd, src, len);
>> +    close(fd);
>> +
>> +    if (len < 0)
>> +        return len;
>> +
>> +    return 0;
>> +}
>> diff --git a/lib/igt_kms.h b/lib/igt_kms.h
>> index 2b26d2bbf..bd154d1c1 100644
>> --- a/lib/igt_kms.h
>> +++ b/lib/igt_kms.h
>> @@ -33,6 +33,7 @@
>>   #include <stdint.h>
>>   #include <stddef.h>
>>   #include <assert.h>
>> +#include <limits.h>
>>   #include <xf86drmMode.h>
>> @@ -513,6 +514,15 @@ typedef struct {
>>       uint16_t tile_h_size, tile_v_size;
>>   } igt_tile_info_t;
>> +/* Backlight context*/
>> +typedef struct {
>> +    int max;
>> +    int old;
>> +    igt_output_t *output;
>> +    char path[PATH_MAX];
>> +    char backlight_dir_path[PATH_MAX];
>> +} igt_backlight_context_t;
>> +
>>   void igt_display_reset_outputs(igt_display_t *display);
>>   void igt_display_require(igt_display_t *display, int drm_fd);
>>   void igt_display_fini(igt_display_t *display);
>> @@ -1253,5 +1263,7 @@ bool 
>> igt_has_force_link_training_failure_debugfs(int drmfd, igt_output_t 
>> *output
>>   int igt_get_dp_pending_lt_failures(int drm_fd, igt_output_t *output);
>>   int igt_get_dp_pending_retrain(int drm_fd, igt_output_t *output);
>>   void igt_reset_link_params(int drm_fd, igt_output_t *output);
>> +int igt_backlight_read(int *result, const char *fname, 
>> igt_backlight_context_t *context);
>> +int igt_backlight_write(int value, const char *fname, 
>> igt_backlight_context_t *context);
>>   #endif /* __IGT_KMS_H__ */