platform/chrome: wilco_ec: Add debugfs test_event file

This change introduces a new debugfs file 'test_event' that when written
to causes the EC to generate a test event.
This adds a second sub cmd for the test event, and pulls out send_ec_cmd
to be a common helper between h1_gpio_get and test_event_set.

Signed-off-by: Daniel Campello <campello@chromium.org>
Reviewed-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Nick Crews <ncrews@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

diff --git a/drivers/platform/chrome/wilco_ec/debugfs.c b/drivers/platform/chrome/wilco_ec/debugfs.c
index 8d65a1e2f1a35929388d027be8f3ec860928d980..df5a5f6c3ec60f1cef51b07eca420e237a14081f 100644 (file)
--- a/drivers/platform/chrome/wilco_ec/debugfs.c
+++ b/drivers/platform/chrome/wilco_ec/debugfs.c
@@ -160,29 +160,29 @@ static const struct file_operations fops_raw = {
 
 #define CMD_KB_CHROME          0x88
 #define SUB_CMD_H1_GPIO                0x0A
+#define SUB_CMD_TEST_EVENT     0x0B
 
-struct h1_gpio_status_request {
+struct ec_request {
        u8 cmd;         /* Always CMD_KB_CHROME */
        u8 reserved;
-       u8 sub_cmd;     /* Always SUB_CMD_H1_GPIO */
+       u8 sub_cmd;
 } __packed;
 
-struct hi_gpio_status_response {
+struct ec_response {
        u8 status;      /* 0 if allowed */
-       u8 val;         /* BIT(0)=ENTRY_TO_FACT_MODE, BIT(1)=SPI_CHROME_SEL */
+       u8 val;
 } __packed;
 
-static int h1_gpio_get(void *arg, u64 *val)
+static int send_ec_cmd(struct wilco_ec_device *ec, u8 sub_cmd, u8 *out_val)
 {
-       struct wilco_ec_device *ec = arg;
-       struct h1_gpio_status_request rq;
-       struct hi_gpio_status_response rs;
+       struct ec_request rq;
+       struct ec_response rs;
        struct wilco_ec_message msg;
        int ret;
 
        memset(&rq, 0, sizeof(rq));
        rq.cmd = CMD_KB_CHROME;
-       rq.sub_cmd = SUB_CMD_H1_GPIO;
+       rq.sub_cmd = sub_cmd;
 
        memset(&msg, 0, sizeof(msg));
        msg.type = WILCO_EC_MSG_LEGACY;
@@ -196,13 +196,38 @@ static int h1_gpio_get(void *arg, u64 *val)
        if (rs.status)
                return -EIO;
 
-       *val = rs.val;
+       *out_val = rs.val;
 
        return 0;
 }
 
+/**
+ * h1_gpio_get() - Gets h1 gpio status.
+ * @arg: The wilco EC device.
+ * @val: BIT(0)=ENTRY_TO_FACT_MODE, BIT(1)=SPI_CHROME_SEL
+ */
+static int h1_gpio_get(void *arg, u64 *val)
+{
+       return send_ec_cmd(arg, SUB_CMD_H1_GPIO, (u8 *)val);
+}
+
 DEFINE_DEBUGFS_ATTRIBUTE(fops_h1_gpio, h1_gpio_get, NULL, "0x%02llx\n");
 
+/**
+ * test_event_set() - Sends command to EC to cause an EC test event.
+ * @arg: The wilco EC device.
+ * @val: unused.
+ */
+static int test_event_set(void *arg, u64 val)
+{
+       u8 ret;
+
+       return send_ec_cmd(arg, SUB_CMD_TEST_EVENT, &ret);
+}
+
+/* Format is unused since it is only required for get method which is NULL */
+DEFINE_DEBUGFS_ATTRIBUTE(fops_test_event, NULL, test_event_set, "%llu\n");
+
 /**
  * wilco_ec_debugfs_probe() - Create the debugfs node
  * @pdev: The platform device, probably created in core.c
@@ -226,6 +251,8 @@ static int wilco_ec_debugfs_probe(struct platform_device *pdev)
        debugfs_create_file("raw", 0644, debug_info->dir, NULL, &fops_raw);
        debugfs_create_file("h1_gpio", 0444, debug_info->dir, ec,
                            &fops_h1_gpio);
+       debugfs_create_file("test_event", 0200, debug_info->dir, ec,
+                           &fops_test_event);
 
        return 0;
 }