linux-kernel - Re: [PATCH] identify firmware version

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Message-ID: <20100906233203.GA18048@seas.upenn.edu>
Date:	Mon, 6 Sep 2010 19:32:03 -0400
From:	Rafi Rubin <rafi@...s.upenn.edu>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>, jkosina@...e.cz,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	micki@...rig.com, rydberg@...omail.se, chatty@...c.fr
Subject: Re: [PATCH] identify firmware version

On Mon, Sep 06, 2010 at 11:22:50PM +0200, Jiri Slaby wrote:
> On 09/06/2010 09:48 PM, Dmitry Torokhov wrote:
> >> @@ -848,10 +871,43 @@ static int ntrig_probe(struct hid_device *hdev, const struct hid_device_id *id)
> >>  	if (report)
> >>  		usbhid_submit_report(hdev, report, USB_DIR_OUT);
> >>  
> >> +	data = kmalloc(8, GFP_KERNEL);
> >> +	if (!data) {
> >> +		ret = -ENOMEM;
> >> +		goto err_free;
> >> +	}
> >> +
> >> +	ret = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
> >> +			      USB_REQ_CLEAR_FEATURE,
> >> +			      USB_TYPE_CLASS | USB_RECIP_INTERFACE |
> >> +			      USB_DIR_IN,
> >> +			      0x30c, 1, data, 8,
> >> +			      USB_CTRL_SET_TIMEOUT);
> >> +
> >> +	if (ret == 8) {
> >> +		buf = kmalloc(20, GFP_KERNEL);
> >> +		if (!buf) {
> >> +			ret = -ENOMEM;
> >> +			goto err_free_data;
> >> +		}
> > 
> > Why do you allocate this from heap? Surely we can spare 20 bytes on
> > stack (you aren't doing DMA into it).
> 
> Hi, yeah, I think so too.

No arguments from me, that was just sloppy.

> > I'd also split all this code into ntrig_report_version() to simplifu
> > error handling here.
> > 
> >> +
> >> +		ret = ntrig_version_string(&data[2], buf);
> >> +
> >> +		dev_info(&hdev->dev,
> >> +			 "Firmware version: %s (%02x%02x %02x%02x)\n",
> >> +			 buf, data[2], data[3], data[4], data[5]);
> >> +
> >> +		kfree(buff);
> 
> In any case, this doesn't compile...
> 
> >> +	}

Jiri, I moved the code to a separate function as Dmitry suggested, and compiled a kernel from a clean tree using 
gcc-3.4 (I think).

If this version fails for you, would you mind being a bit more verbose about the failure.

Rafi

---
 drivers/hid/hid-ntrig.c |   51 +++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 51 insertions(+), 0 deletions(-)

diff --git a/drivers/hid/hid-ntrig.c b/drivers/hid/hid-ntrig.c
index 43e95de..69169ef 100644
--- a/drivers/hid/hid-ntrig.c
+++ b/drivers/hid/hid-ntrig.c
@@ -90,6 +90,55 @@ struct ntrig_data {
 };
 
 
+/*
+ * This function converts the 4 byte raw firmware code into
+ * a string containing 5 comma separated numbers.
+ */
+static int ntrig_version_string(unsigned char *raw, char *buf)
+{
+	__u8 a =  (raw[1] & 0x0e) >> 1;
+	__u8 b =  (raw[0] & 0x3c) >> 2;
+	__u8 c = ((raw[0] & 0x03) << 3) | ((raw[3] & 0xe0) >> 5);
+	__u8 d = ((raw[3] & 0x07) << 3) | ((raw[2] & 0xe0) >> 5);
+	__u8 e =   raw[2] & 0x07;
+
+	/*
+	 * As yet unmapped bits:
+	 * 0b11000000 0b11110001 0b00011000 0b00011000
+	 */
+
+	return sprintf(buf, "%u.%u.%u.%u.%u", a, b, c, d, e);
+}
+
+static void ntrig_report_version(struct hid_device *hdev)
+{
+	int ret;
+	char buf[20];
+	struct usb_device *usb_dev = hid_to_usb_dev(hdev);
+	unsigned char *data = kmalloc(8, GFP_KERNEL);
+
+	if (!data)
+		goto err_free;
+
+	ret = usb_control_msg(usb_dev, usb_rcvctrlpipe(usb_dev, 0),
+			      USB_REQ_CLEAR_FEATURE,
+			      USB_TYPE_CLASS | USB_RECIP_INTERFACE |
+			      USB_DIR_IN,
+			      0x30c, 1, data, 8,
+			      USB_CTRL_SET_TIMEOUT);
+
+	if (ret == 8) {
+		ret = ntrig_version_string(&data[2], buf);
+
+		dev_info(&hdev->dev,
+			 "Firmware version: %s (%02x%02x %02x%02x)\n",
+			 buf, data[2], data[3], data[4], data[5]);
+	}
+
+err_free:
+	kfree(data);
+}
+
 static ssize_t show_phys_width(struct device *dev,
 			       struct device_attribute *attr,
 			       char *buf)
@@ -848,6 +897,8 @@ static int ntrig_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	if (report)
 		usbhid_submit_report(hdev, report, USB_DIR_OUT);
 
+	ntrig_report_version(hdev);
+
 	ret = sysfs_create_group(&hdev->dev.kobj,
 			&ntrig_attribute_group);
 
-- 
1.7.1


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