linux-kernel - [PATCH v3 2/4] mfd: cros_ec: instantiate properly CrOS ISH MCU device

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Date:   Mon,  8 Apr 2019 11:41:39 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     lee.jones@...aro.org
Cc:     gwendal@...omium.org, bleung@...omium.org,
        linux-kernel@...r.kernel.org, groeck@...omium.org,
        kernel@...labora.com, dtor@...omium.org,
        rushikesh.s.kadam@...el.com,
        Andy Shevchenko <andriy.shevchenko@...el.com>
Subject: [PATCH v3 2/4] mfd: cros_ec: instantiate properly CrOS ISH MCU device

From: Rushikesh S Kadam <rushikesh.s.kadam@...el.com>

Integrated Sensor Hub (ISH) is also a MCU running EC
having feature bit EC_FEATURE_ISH. Instantiate it as
a special CrOS EC device with device name 'cros_ish'.

Signed-off-by: Rushikesh S Kadam <rushikesh.s.kadam@...el.com>
Reviewed-by: Gwendal Grignou <gwendal@...omium.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...el.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
---

Changes in v3:
- Fix Andy Shevchenko email.

Changes in v2:
- Add a patch to instantiate the CrOS ISH device to the series.

 drivers/mfd/cros_ec_dev.c   | 13 +++++++++++++
 include/linux/mfd/cros_ec.h |  5 +++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index 99cfdb5b71ef..1daccd4e05a3 100644
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -636,6 +636,19 @@ static int ec_device_probe(struct platform_device *pdev)
 	device_initialize(&ec->class_dev);
 	cdev_init(&ec->cdev, &fops);
 
+	/*
+	 * Check whether this is actually an Integrated Sensor Hub (ISH)
+	 * rather than an EC.
+	 */
+	if (cros_ec_check_features(ec, EC_FEATURE_ISH)) {
+		dev_info(dev, "CrOS ISH MCU detected.\n");
+		/*
+		 * Help userspace differentiating ECs from ISH MCU,
+		 * regardless of the probing order.
+		 */
+		ec_platform->ec_name = CROS_EC_DEV_ISH_NAME;
+	}
+
 	/*
 	 * Add the class device
 	 * Link to the character device for creating the /dev entry
diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index b6442201f77f..ce50628aa5e7 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -22,8 +22,9 @@
 #include <linux/mfd/cros_ec_commands.h>
 #include <linux/mutex.h>
 
-#define CROS_EC_DEV_NAME "cros_ec"
-#define CROS_EC_DEV_PD_NAME "cros_pd"
+#define CROS_EC_DEV_NAME	"cros_ec"
+#define CROS_EC_DEV_ISH_NAME	"cros_ish"
+#define CROS_EC_DEV_PD_NAME	"cros_pd"
 
 /*
  * The EC is unresponsive for a time after a reboot command.  Add a
-- 
2.20.1