linux-kernel - [PATCH 12/14] HID: hidraw: replace hid_output_raw

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Date:	Mon, 10 Feb 2014 12:58:57 -0500
From:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	David Herrmann <dh.herrmann@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 12/14] HID: hidraw: replace hid_output_raw_report() calls by appropriates ones

Remove hid_output_raw_report() call as it is not a ll_driver callbacj,
and switch to the hid_hw_* implementation. USB-HID used to fallback
into SET_REPORT when there were no output interrupt endpoint,
so emulating this if hid_hw_output_report() returns -ENOSYS.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
---
 drivers/hid/hidraw.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index f8708c9..704718b 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -123,10 +123,8 @@ static ssize_t hidraw_send_report(struct file *file, const char __user *buffer,
 
 	dev = hidraw_table[minor]->hid;
 
-	if (!dev->hid_output_raw_report) {
-		ret = -ENODEV;
-		goto out;
-	}
+	if (!dev->ll_driver->raw_request || !dev->ll_driver->output_report)
+		return -ENODEV;
 
 	if (count > HID_MAX_BUFFER_SIZE) {
 		hid_warn(dev, "pid %d passed too large report\n",
@@ -153,7 +151,21 @@ static ssize_t hidraw_send_report(struct file *file, const char __user *buffer,
 		goto out_free;
 	}
 
-	ret = hid_output_raw_report(dev, buf, count, report_type);
+	if (report_type == HID_OUTPUT_REPORT) {
+		ret = hid_hw_output_report(dev, buf, count);
+		/*
+		 * compatibility with old implementation of USB-HID and I2C-HID:
+		 * if the device does not support receiving output reports,
+		 * on an interrupt endpoint, then fallback to the SET_REPORT
+		 * HID command.
+		 */
+		if (ret != -ENOSYS)
+			goto out_free;
+	}
+
+	ret = hid_hw_raw_request(dev, buf[0], buf, count, report_type,
+				HID_REQ_SET_REPORT);
+
 out_free:
 	kfree(buf);
 out:
-- 
1.8.3.1

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