uapi: wcd-spi-ac: add interface for client driver

The wcd-spi-ac (access control) driver exposes character
device to userspace to indicate information regarding
WCD SPI usage. Add uapi header file with the commands
and data expected by the character driver.

Change-Id: I41dfc3181041c7e7a1bad8695fa723d3a965036b
Signed-off-by: Bhalchandra Gajare <gajare@codeaurora.org>

include/uapi/linux/Kbuild

@@ -18,3 +18,4 @@ header-y += msm_audio_ape.h
 header-y += msm_audio_g711.h
 header-y += msm_audio_g711_dec.h
 header-y += mfd/
+header-y += wcd-spi-ac-params.h

include/uapi/linux/wcd-spi-ac-params.h

@@ -0,0 +1,52 @@
+#ifndef __UAPI_WCD_SPI_AC_PARAMS_H__
+#define __UAPI_WCD_SPI_AC_PARAMS_H__
+
+#include <linux/types.h>
+
+#define WCD_SPI_AC_CMD_CONC_BEGIN	0x01
+#define WCD_SPI_AC_CMD_CONC_END		0x02
+#define WCD_SPI_AC_CMD_BUF_DATA		0x03
+
+#define WCD_SPI_AC_MAX_BUFFERS		2
+#define WCD_SPI_AC_MAX_CH_PER_BUF	8
+
+#define WCD_SPI_AC_CLIENT_CDEV_NAME	"wcd-spi-ac-client"
+#define WCD_SPI_AC_PROCFS_DIR_NAME	"wcd-spi-ac"
+#define WCD_SPI_AC_PROCFS_STATE_NAME	"svc-state"
+
+/*
+ * wcd_spi_ac_buf_data:
+ *	Buffer address for one buffer. Should have data
+ *	for all the channels. If channels are unused, the
+ *	value must be NULL.
+ *
+ * @addr:
+ *	Address where each channel of the buffer starts.
+ */
+struct wcd_spi_ac_buf_data {
+	__u32 addr[WCD_SPI_AC_MAX_CH_PER_BUF];
+} __packed;
+
+/*
+ * wcd_spi_ac_write_cmd:
+ *	Data sent to the driver's write interface should
+ *	be packed in this format.
+ *
+ * @cmd_type:
+ *	Indicates the type of command that is sent. Should
+ *	be one of the valid commands defined with
+ *	WCD_SPI_AC_CMD_*
+ * @payload:
+ *	No payload for:
+ *		WCD_SPI_AC_CMD_CONC_BEGIN
+ *		WCD_SPI_AC_CMD_CONC_END
+ *	Upto WCD_SPI_AC_MAX_BUFFERS of type
+ *	struct wcd_spi_ac_buf_data for:
+ *		WCD_SPI_AC_CMD_BUF_DATA
+ */
+struct wcd_spi_ac_write_cmd {
+	__u32 cmd_type;
+	__u8 payload[0];
+} __packed;
+
+#endif /* end of __UAPI_WCD_SPI_AC_PARAMS_H__ */