[PATCH 2/4] ASoC: soc.h: Add SND_SOC_BYTES_E_ACC() to allow setting access flags

[Richard Fitzgerald <rf@opensource.cirrus.com>]

Add a macro SND_SOC_BYTES_E_ACC() to allow the access permission flags
to be set. This is the same as SND_SOC_BYTES_E() but with an extra
argument for the access flags.

This will be used by the cs35l56.c driver to create a read-only
volatile byte control. It's preferable to avoid custom control macros
in codec drivers. Code maintenance is easier if all control macros are
defined together in soc.h.

This commit only creates this one macro that is actually going to be used.
There's no point cluttering soc.h with unused macros - that just adds a
maintenance burden. People can add equivalents for the other macros if
they need them.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
---
 include/sound/soc.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index b1b6b6a497da..aa0fe6b80293 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -338,6 +338,13 @@ struct platform_device;
 	.put = xhandler_put, .private_value = \
 		((unsigned long)&(struct soc_bytes) \
 		{.base = xbase, .num_regs = xregs }) }
+#define SND_SOC_BYTES_E_ACC(xname, xbase, xregs, xhandler_get, xhandler_put, xaccess) \
+{	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
+	.access = xaccess, \
+	.info = snd_soc_bytes_info, .get = xhandler_get, \
+	.put = xhandler_put, .private_value = \
+		((unsigned long)&(struct soc_bytes) \
+		{.base = xbase, .num_regs = xregs }) }
 
 #define SND_SOC_BYTES_MASK(xname, xbase, xregs, xmask)	      \
 {	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname,   \
-- 
2.47.3