linux-kernel - [PATCH 02/13] mfd: cros_ec: Add EC console read structures definitions

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Date:   Fri, 17 Mar 2017 14:57:43 +0100
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Olof Johansson <olof@...om.net>,
        Benson Leung <bleung@...omium.org>,
        Lee Jones <lee.jones@...aro.org>
Cc:     linux-kernel@...r.kernel.org,
        Nicolas Boichat <drinkcat@...omium.org>
Subject: [PATCH 02/13] mfd: cros_ec: Add EC console read structures definitions

From: Nicolas Boichat <drinkcat@...omium.org>

ec_params_console_read_v1 is used to capture EC logs from kernel,
and ec_params_get_cmd_versions_v1 is used to probe whether EC
supports that command.

Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
Reviewed-by: Guenter Roeck <groeck@...omium.org>
Acked-by: Lee Jones <lee.jones@...aro.org>
Tested-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
---
 include/linux/mfd/cros_ec_commands.h | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
index f1ef638..3497e1a 100644
--- a/include/linux/mfd/cros_ec_commands.h
+++ b/include/linux/mfd/cros_ec_commands.h
@@ -625,6 +625,10 @@ struct ec_params_get_cmd_versions {
 	uint8_t cmd;      /* Command to check */
 } __packed;
 
+struct ec_params_get_cmd_versions_v1 {
+	uint16_t cmd;     /* Command to check */
+} __packed;
+
 struct ec_response_get_cmd_versions {
 	/*
 	 * Mask of supported versions; use EC_VER_MASK() to compare with a
@@ -2281,13 +2285,28 @@ struct ec_params_charge_control {
 #define EC_CMD_CONSOLE_SNAPSHOT 0x97
 
 /*
- * Read next chunk of data from saved snapshot.
+ * Read data from the saved snapshot. If the subcmd parameter is
+ * CONSOLE_READ_NEXT, this will return data starting from the beginning of
+ * the latest snapshot. If it is CONSOLE_READ_RECENT, it will start from the
+ * end of the previous snapshot.
+ *
+ * The params are only looked at in version >= 1 of this command. Prior
+ * versions will just default to CONSOLE_READ_NEXT behavior.
  *
  * Response is null-terminated string.  Empty string, if there is no more
  * remaining output.
  */
 #define EC_CMD_CONSOLE_READ 0x98
 
+enum ec_console_read_subcmd {
+	CONSOLE_READ_NEXT = 0,
+	CONSOLE_READ_RECENT
+};
+
+struct ec_params_console_read_v1 {
+	uint8_t subcmd; /* enum ec_console_read_subcmd */
+} __packed;
+
 /*****************************************************************************/
 
 /*
-- 
2.9.3