LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Prashant Malani <pmalani@chromium.org>
To: linux-kernel@vger.kernel.org
Cc: furquan@chromium.org, Prashant Malani <pmalani@chromium.org>,
	Benson Leung <bleung@chromium.org>,
	Enric Balletbo i Serra <enric.balletbo@collabora.com>
Subject: [PATCH 3/3] platform/chrome: notify: Pull PD_HOST_EVENT status
Date: Thu, 12 Mar 2020 03:08:11 -0700	[thread overview]
Message-ID: <20200312100809.21153-4-pmalani@chromium.org> (raw)
In-Reply-To: <20200312100809.21153-1-pmalani@chromium.org>

Read the PD host even status from the EC and send that to the notifier
listeners, for more fine-grained event information.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
---
 drivers/platform/chrome/cros_usbpd_notify.c | 87 ++++++++++++++++++++-
 1 file changed, 84 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/chrome/cros_usbpd_notify.c b/drivers/platform/chrome/cros_usbpd_notify.c
index d2dbf7017e29c..3d9db4146217e 100644
--- a/drivers/platform/chrome/cros_usbpd_notify.c
+++ b/drivers/platform/chrome/cros_usbpd_notify.c
@@ -53,11 +53,91 @@ void cros_usbpd_unregister_notify(struct notifier_block *nb)
 }
 EXPORT_SYMBOL_GPL(cros_usbpd_unregister_notify);
 
+/**
+ * cros_ec_pd_command - Send a command to the EC.
+ *
+ * @ec_dev: EC device
+ * @command: EC command
+ * @outdata: EC command output data
+ * @outsize: Size of outdata
+ * @indata: EC command input data
+ * @insize: Size of indata
+ *
+ * Return: 0 on success, < 0 on failure.
+ */
+static int cros_ec_pd_command(struct cros_ec_device *ec_dev,
+			      int command,
+			      uint8_t *outdata,
+			      int outsize,
+			      uint8_t *indata,
+			      int insize)
+{
+	int ret;
+	struct cros_ec_command *msg;
+
+	msg = kzalloc(sizeof(*msg) + max(insize, outsize), GFP_KERNEL);
+	if (!msg)
+		return -EC_RES_ERROR;
+
+	msg->command = command;
+	msg->outsize = outsize;
+	msg->insize = insize;
+
+	if (outsize)
+		memcpy(msg->data, outdata, outsize);
+
+	ret = cros_ec_cmd_xfer_status(ec_dev, msg);
+	if (ret < 0)
+		goto error;
+
+	if (insize)
+		memcpy(indata, msg->data, insize);
+	ret = EC_RES_SUCCESS;
+error:
+	kfree(msg);
+	return ret;
+}
+
+static void cros_usbpd_get_event_and_notify(struct device  *dev,
+					    struct cros_ec_device *ec_dev)
+{
+	struct ec_response_host_event_status host_event_status;
+	u32 event = 0;
+	int ret;
+
+	/*
+	 * We still send a 0 event out to older devices which don't
+	 * have the updated device heirarchy.
+	 */
+	if (!ec_dev) {
+		dev_dbg(dev,
+			"EC device inaccessible; sending 0 event status.\n");
+		goto send_notify;
+	}
+
+	/* Check for PD host events on EC. */
+	ret = cros_ec_pd_command(ec_dev, EC_CMD_PD_HOST_EVENT_STATUS,
+				 NULL, 0,
+				 (uint8_t *)&host_event_status,
+				 sizeof(host_event_status));
+	if (ret < 0) {
+		dev_warn(dev, "Can't get host event status (err: %d)\n", ret);
+		goto send_notify;
+	}
+
+	event = host_event_status.status;
+
+send_notify:
+	blocking_notifier_call_chain(&cros_usbpd_notifier_list, event, NULL);
+}
+
 #ifdef CONFIG_ACPI
 
 static void cros_usbpd_notify_acpi(acpi_handle device, u32 event, void *data)
 {
-	blocking_notifier_call_chain(&cros_usbpd_notifier_list, event, NULL);
+	struct cros_usbpd_notify_data *pdnotify = data;
+
+	cros_usbpd_get_event_and_notify(pdnotify->dev, pdnotify->ec);
 }
 
 static int cros_usbpd_notify_probe_acpi(struct platform_device *pdev)
@@ -144,6 +224,8 @@ static int cros_usbpd_notify_plat(struct notifier_block *nb,
 				  unsigned long queued_during_suspend,
 				  void *data)
 {
+	struct cros_usbpd_notify_data *pdnotify = container_of(nb,
+			struct cros_usbpd_notify_data, nb);
 	struct cros_ec_device *ec_dev = (struct cros_ec_device *)data;
 	u32 host_event = cros_ec_get_host_event(ec_dev);
 
@@ -151,8 +233,7 @@ static int cros_usbpd_notify_plat(struct notifier_block *nb,
 		return NOTIFY_BAD;
 
 	if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) {
-		blocking_notifier_call_chain(&cros_usbpd_notifier_list,
-					     host_event, NULL);
+		cros_usbpd_get_event_and_notify(pdnotify->dev, ec_dev);
 		return NOTIFY_OK;
 	}
 	return NOTIFY_DONE;
-- 
2.25.1.696.g5e7596f4ac-goog


  parent reply	other threads:[~2020-03-12 10:09 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-12 10:08 [PATCH 0/3] platform/chrome: notify: Use PD_HOST_EVENT_STATUS Prashant Malani
2020-03-12 10:08 ` [PATCH 1/3] platform/chrome: notify: Add driver data struct Prashant Malani
2020-03-13 12:41   ` Enric Balletbo i Serra
2020-03-12 10:08 ` [PATCH 2/3] platform/chrome: notify: Amend ACPI driver to plat Prashant Malani
2020-03-13 12:42   ` Enric Balletbo i Serra
2020-03-15 21:38     ` Prashant Malani
2020-03-16  7:34       ` Prashant Malani
2020-03-12 10:08 ` Prashant Malani [this message]
2020-03-13 12:43   ` [PATCH 3/3] platform/chrome: notify: Pull PD_HOST_EVENT status Enric Balletbo i Serra
2020-03-15 21:41     ` Prashant Malani

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200312100809.21153-4-pmalani@chromium.org \
    --to=pmalani@chromium.org \
    --cc=bleung@chromium.org \
    --cc=enric.balletbo@collabora.com \
    --cc=furquan@chromium.org \
    --cc=linux-kernel@vger.kernel.org \
    --subject='Re: [PATCH 3/3] platform/chrome: notify: Pull PD_HOST_EVENT status' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).