platform/chrome: cros_ec_debugfs: Add PD port info to debugfs

Add info useful for debugging USB-PD port state.

Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Benson Leung <bleung@chromium.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
index 539403022568..cc265ed8deb7 100644
--- a/drivers/platform/chrome/cros_ec_debugfs.c
+++ b/drivers/platform/chrome/cros_ec_debugfs.c
@@ -211,6 +211,58 @@ static int cros_ec_console_log_release(struct inode *inode, struct file *file)
         return 0;
 }
 
+static ssize_t cros_ec_pdinfo_read(struct file *file,
+                                   char __user *user_buf,
+                                   size_t count,
+                                   loff_t *ppos)
+{
+        char read_buf[EC_USB_PD_MAX_PORTS * 40], *p = read_buf;
+        struct cros_ec_debugfs *debug_info = file->private_data;
+        struct cros_ec_device *ec_dev = debug_info->ec->ec_dev;
+        struct {
+                struct cros_ec_command msg;
+                union {
+                        struct ec_response_usb_pd_control_v1 resp;
+                        struct ec_params_usb_pd_control params;
+                };
+        } __packed ec_buf;
+        struct cros_ec_command *msg;
+        struct ec_response_usb_pd_control_v1 *resp;
+        struct ec_params_usb_pd_control *params;
+        int i;
+
+        msg = &ec_buf.msg;
+        params = (struct ec_params_usb_pd_control *)msg->data;
+        resp = (struct ec_response_usb_pd_control_v1 *)msg->data;
+
+        msg->command = EC_CMD_USB_PD_CONTROL;
+        msg->version = 1;
+        msg->insize = sizeof(*resp);
+        msg->outsize = sizeof(*params);
+
+        /*
+         * Read status from all PD ports until failure, typically caused
+         * by attempting to read status on a port that doesn't exist.
+         */
+        for (i = 0; i < EC_USB_PD_MAX_PORTS; ++i) {
+                params->port = i;
+                params->role = 0;
+                params->mux = 0;
+                params->swap = 0;
+
+                if (cros_ec_cmd_xfer_status(ec_dev, msg) < 0)
+                        break;
+
+                p += scnprintf(p, sizeof(read_buf) + read_buf - p,
+                               "p%d: %s en:%.2x role:%.2x pol:%.2x\n", i,
+                               resp->state, resp->enabled, resp->role,
+                               resp->polarity);
+        }
+
+        return simple_read_from_buffer(user_buf, count, ppos,
+                                       read_buf, p - read_buf);
+}
+
 const struct file_operations cros_ec_console_log_fops = {
         .owner = THIS_MODULE,
         .open = cros_ec_console_log_open,
@@ -220,6 +272,13 @@ const struct file_operations cros_ec_console_log_fops = {
         .release = cros_ec_console_log_release,
 };
 
+const struct file_operations cros_ec_pdinfo_fops = {
+        .owner = THIS_MODULE,
+        .open = simple_open,
+        .read = cros_ec_pdinfo_read,
+        .llseek = default_llseek,
+};
+
 static int ec_read_version_supported(struct cros_ec_dev *ec)
 {
         struct ec_params_get_cmd_versions_v1 *params;
@@ -355,6 +414,15 @@ free:
         return ret;
 }
 
+static int cros_ec_create_pdinfo(struct cros_ec_debugfs *debug_info)
+{
+        if (!debugfs_create_file("pdinfo", 0444, debug_info->dir, debug_info,
+                                 &cros_ec_pdinfo_fops))
+                return -ENOMEM;
+
+        return 0;
+}
+
 int cros_ec_debugfs_init(struct cros_ec_dev *ec)
 {
         struct cros_ec_platform *ec_platform = dev_get_platdata(ec->dev);
@@ -379,6 +447,10 @@ int cros_ec_debugfs_init(struct cros_ec_dev *ec)
         if (ret)
                 goto remove_debugfs;
 
+        ret = cros_ec_create_pdinfo(debug_info);
+        if (ret)
+                goto remove_debugfs;
+
         ec->debug_info = debug_info;
 
         return 0;