[media] smiapp: Allow generic quirk registers

Implement more generic quirk registers than just limit and capability
registers. This comes with the expense of a little bit more access time so
these should be only used when really needed.

Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/smiapp/smiapp-regs.c b/drivers/media/video/smiapp/smiapp-regs.c
index 9c430647..b1812b1 100644
--- a/drivers/media/video/smiapp/smiapp-regs.c
+++ b/drivers/media/video/smiapp/smiapp-regs.c
@@ -172,6 +172,9 @@
 	    && len != SMIA_REG_32BIT)
 		return -EINVAL;
 
+	if (smiapp_quirk_reg(sensor, reg, val))
+		goto found_quirk;
+
 	if (len == SMIA_REG_8BIT && !only8)
 		rval = ____smiapp_read(sensor, (u16)reg, len, val);
 	else
@@ -179,6 +182,7 @@
 	if (rval < 0)
 		return rval;
 
+found_quirk:
 	if (reg & SMIA_REG_FLAG_FLOAT)
 		*val = float_to_u32_mul_1000000(client, *val);