path: root/packages/linux/linux-ezx-2.6.24/patches/pxav4l4-8.patch.eml

Path: news.gmane.org!not-for-mail
From: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Newsgroups: gmane.comp.video.video4linux
Subject: [RFC PATCH 4/8] Add support for the MT9M001 camera
Date: Wed, 23 Jan 2008 18:41:48 +0100 (CET)
Lines: 710
Approved: news@gmane.org
Message-ID: <Pine.LNX.4.64.0801231825190.4932@axis700.grange>
References: <Pine.LNX.4.64.0801231646090.4932@axis700.grange>
NNTP-Posting-Host: lo.gmane.org
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Trace: ger.gmane.org 1201110157 28881 80.91.229.12 (23 Jan 2008 17:42:37 GMT)
X-Complaints-To: usenet@ger.gmane.org
NNTP-Posting-Date: Wed, 23 Jan 2008 17:42:37 +0000 (UTC)
To: video4linux-list@redhat.com
Original-X-From: video4linux-list-bounces@redhat.com Wed Jan 23 18:42:56 2008
Return-path: <video4linux-list-bounces@redhat.com>
Envelope-to: rh-video4linux-list@gmane.org
Original-Received: from hormel.redhat.com ([209.132.177.30])
	by lo.gmane.org with esmtp (Exim 4.50)
	id 1JHjcT-00035B-5V
	for rh-video4linux-list@gmane.org; Wed, 23 Jan 2008 18:42:38 +0100
Original-Received: from listman.util.phx.redhat.com (listman.util.phx.redhat.com [10.8.4.110])
	by hormel.redhat.com (Postfix) with ESMTP
	id 9E85472FB4; Wed, 23 Jan 2008 12:42:10 -0500 (EST)
Original-Received: from int-mx1.corp.redhat.com (int-mx1.corp.redhat.com
	[172.16.52.254])
	by listman.util.phx.redhat.com (8.13.1/8.13.1) with ESMTP id
	m0NHg8l9017245 for <video4linux-list@listman.util.phx.redhat.com>;
	Wed, 23 Jan 2008 12:42:08 -0500
Original-Received: from mx3.redhat.com (mx3.redhat.com [172.16.48.32])
	by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id m0NHg8vG028189
	for <video4linux-list@redhat.com>; Wed, 23 Jan 2008 12:42:08 -0500
Original-Received: from mail.gmx.net (mail.gmx.net [213.165.64.20])
	by mx3.redhat.com (8.13.1/8.13.1) with SMTP id m0NHfZHu001044
	for <video4linux-list@redhat.com>; Wed, 23 Jan 2008 12:41:35 -0500
Original-Received: (qmail invoked by alias); 23 Jan 2008 17:41:29 -0000
Original-Received: from p57BD2F1F.dip0.t-ipconnect.de (EHLO axis700.grange)
	[87.189.47.31]
	by mail.gmx.net (mp052) with SMTP; 23 Jan 2008 18:41:29 +0100
X-Authenticated: #20450766
X-Provags-ID: V01U2FsdGVkX18JzEdNfKMJtAD7BzHkb2TLaDIMUqlssnktvE95Pt
	3/al7Wqsw8NYli
Original-Received: from lyakh (helo=localhost)
	by axis700.grange with local-esmtp (Exim 4.63)
	(envelope-from <g.liakhovetski@gmx.de>) id 1JHjbg-00029w-Ku
	for video4linux-list@redhat.com; Wed, 23 Jan 2008 18:41:48 +0100
X-X-Sender: lyakh@axis700.grange
In-Reply-To: <Pine.LNX.4.64.0801231646090.4932@axis700.grange>
X-Y-GMX-Trusted: 0
X-RedHat-Spam-Score: 0 
X-Scanned-By: MIMEDefang 2.58 on 172.16.52.254
X-Scanned-By: MIMEDefang 2.58 on 172.16.48.32
X-loop: video4linux-list@redhat.com
X-BeenThere: video4linux-list@redhat.com
X-Mailman-Version: 2.1.5
Precedence: junk
List-Id: Linux and Kernel Video <video4linux-list.redhat.com>
List-Unsubscribe: <https://www.redhat.com/mailman/listinfo/video4linux-list>, 
	<mailto:video4linux-list-request@redhat.com?subject=unsubscribe>
List-Archive: <https://www.redhat.com/mailman/private/video4linux-list>
List-Post: <mailto:video4linux-list@redhat.com>
List-Help: <mailto:video4linux-list-request@redhat.com?subject=help>
List-Subscribe: <https://www.redhat.com/mailman/listinfo/video4linux-list>,
	<mailto:video4linux-list-request@redhat.com?subject=subscribe>
Original-Sender: video4linux-list-bounces@redhat.com
Errors-To: video4linux-list-bounces@redhat.com
Xref: news.gmane.org gmane.comp.video.video4linux:36473
Archived-At: <http://permalink.gmane.org/gmane.comp.video.video4linux/36473>

This driver supports Micron MT9M001 monochrome and colour cameras.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
---
 drivers/media/video/Kconfig   |   15 +
 drivers/media/video/Makefile  |    1 +
 drivers/media/video/mt9m001.c |  649 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 665 insertions(+), 0 deletions(-)
 create mode 100644 drivers/media/video/mt9m001.c

diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index dc0dfec..def5246 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -803,6 +803,21 @@ config SOC_CAMERA
 	  over a bus like PCI or USB. For example some i2c camera hanging
 	  directly on the data bus of an SoC.
 
+config SOC_CAMERA_MT9M001
+	tristate "mt9m001 support"
+	depends on SOC_CAMERA
+	select SENSORS_PCA9536 if MT9M001_PCA9536_SWITCH
+	help
+	  This driver supports MT9M001 cameras from Micron, monochrome
+	  and colour models.
+
+config MT9M001_PCA9536_SWITCH
+	bool "pca9536 datawidth switch for mt9m001"
+	depends on SOC_CAMERA_MT9M001
+	help
+	  Select this if your MT9M001 camera uses a PCA9536 I2C GPIO
+	  extender to switch between 8 and 10 bit datawidth modes
+
 config VIDEO_PXA27X
 	tristate "PXA27x Quick Capture Interface driver"
 	depends on VIDEO_DEV && PXA27x
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index 81b7cd6..c56bfdb 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -118,5 +118,6 @@ obj-$(CONFIG_VIDEO_VIVI) += vivi.o
 
 obj-$(CONFIG_VIDEO_PXA27X)	+= pxa_camera.o
 obj-$(CONFIG_SOC_CAMERA)	+= soc_camera.o
+obj-$(CONFIG_SOC_CAMERA_MT9M001)	+= mt9m001.o
 
 EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core
diff --git a/drivers/media/video/mt9m001.c b/drivers/media/video/mt9m001.c
new file mode 100644
index 0000000..dc4cc8f
--- /dev/null
+++ b/drivers/media/video/mt9m001.c
@@ -0,0 +1,649 @@
+/*
+ * Driver for MT9M001 CMOS Image Sensor from Micron
+ *
+ * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/videodev.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/log2.h>
+
+#include <media/v4l2-common.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/soc_camera.h>
+
+/* mt9m001 i2c address 0x5d
+ * The platform has to define i2c_board_info
+ * and call i2c_register_board_info() */
+
+/* mt9m001 selected register addresses */
+#define MT9M001_CHIP_VERSION		0x00
+#define MT9M001_ROW_START		0x01
+#define MT9M001_COLUMN_START		0x02
+#define MT9M001_WINDOW_HEIGHT		0x03
+#define MT9M001_WINDOW_WIDTH		0x04
+#define MT9M001_HORIZONTAL_BLANKING	0x05
+#define MT9M001_VERTICAL_BLANKING	0x06
+#define MT9M001_OUTPUT_CONTROL		0x07
+#define MT9M001_SHUTTER_WIDTH		0x09
+#define MT9M001_FRAME_RESTART		0x0b
+#define MT9M001_SHUTTER_DELAY		0x0c
+#define MT9M001_RESET			0x0d
+#define MT9M001_READ_OPTIONS1		0x1e
+#define MT9M001_READ_OPTIONS2		0x20
+#define MT9M001_GLOBAL_GAIN		0x35
+#define MT9M001_CHIP_ENABLE		0xF1
+
+/* must be 32 bit, bitwise coded by reg_to_int and int_to_reg below */
+struct reg_access {
+	u16	value;
+	u8	address;
+	u8	rw;
+} __attribute__ ((packed));
+
+union reg_access_32 {
+	struct reg_access	reg;
+	u32			ctrl;
+};
+
+enum reg_rw { REG_READ = 0, REG_WRITE = 1, };
+
+/*
+#define reg_to_int(rw, address, value) ({			\
+	union reg_access_32 u = {.reg = {value, address, rw}};	\
+	u.i32;							\
+})
+*/
+
+/* rw has to be numerically most significant, because
+ * maximum, minimum and value are signed */
+#ifdef __LITTLE_ENDIAN
+#define reg_to_int(rw, address, value) (((value) & 0xffff) | (((address) & 0xff) << 16) | (((rw) & 0x7f) << 24))
+#else
+#define reg_to_int(rw, address, value) ((((value) & 0xffff) << 16) | (((address) & 0xff) << 8) | ((rw) & 0x7f))
+#endif
+
+static const struct soc_camera_data_format mt9m001_colour_formats[]= {
+	{
+		.name		= "RGB Bayer (sRGB)",
+		.depth		= 16,
+		.fourcc		= V4L2_PIX_FMT_SBGGR8,
+		.colorspace	= V4L2_COLORSPACE_SRGB,
+	}
+};
+
+static const struct soc_camera_data_format mt9m001_monochrome_formats[]= {
+	{
+		.name		= "Monochrome 10 bit",
+		.depth		= 10,
+		.fourcc		= V4L2_PIX_FMT_Y16,
+	}, {
+		.name		= "Monochrome 8 bit",
+		.depth		= 8,
+		.fourcc		= V4L2_PIX_FMT_GREY,
+	},
+};
+
+enum mt9m001_model {
+	MT9M001C12ST,
+	MT9M001C12STM
+};
+
+struct mt9m001 {
+	struct i2c_client *client;
+	struct soc_camera_device icd;
+	enum mt9m001_model model;
+	struct i2c_client *data_switch;
+	unsigned char autoexposure;
+	unsigned char datawidth;
+};
+
+static int reg_read(struct soc_camera_device *icd, const u8 reg)
+{
+	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+	struct i2c_client *client = mt9m001->client;
+	s32 data = i2c_smbus_read_word_data(client, reg);
+	return data < 0 ? data : swab16(data);
+}
+
+static int reg_write(struct soc_camera_device *icd, const u8 reg,
+		     const u16 data)
+{
+	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+	return i2c_smbus_write_word_data(mt9m001->client, reg, swab16(data));
+}
+
+static int reg_set(struct soc_camera_device *icd, const u8 reg,
+		   const u16 data)
+{
+	int ret;
+
+	if ((ret = reg_read(icd, reg)) < 0)
+		return ret;
+	return reg_write(icd, reg, ret | data);
+}
+
+static int reg_clear(struct soc_camera_device *icd, const u8 reg,
+		     const u16 data)
+{
+	int ret;
+
+	if ((ret = reg_read(icd, reg)) < 0)
+		return ret;
+	return reg_write(icd, reg, ret & ~data);
+}
+
+static int mt9m001_init(struct soc_camera_device *icd)
+{
+	int ret;
+
+	/* Disable chip, synchronous option update */
+	dev_dbg(icd->vdev->dev, "%s\n", __FUNCTION__);
+
+	ret = reg_write(icd, MT9M001_RESET, 1);
+	if (ret >= 0)
+		ret = reg_write(icd, MT9M001_RESET, 0);
+	if (ret >= 0)
+		ret = reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
+
+	return ret >= 0 ? 0 : -EIO;
+}
+
+static int mt9m001_release(struct soc_camera_device *icd)
+{
+	/* Disable the chip */
+	reg_write(icd, MT9M001_OUTPUT_CONTROL, 0);
+	return 0;
+}
+
+static int mt9m001_start_capture(struct soc_camera_device *icd)
+{
+	/* Switch to master "normal" mode */
+	if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 2) < 0)
+		return -EIO;
+	return 0;
+}
+
+static int mt9m001_stop_capture(struct soc_camera_device *icd)
+{
+	/* Stop sensor readout */
+	if (reg_write(icd, MT9M001_OUTPUT_CONTROL, 0) < 0)
+		return -EIO;
+	return 0;
+}
+
+extern int pca9536_set_level(struct i2c_client *client, u8 pin, u8 level);
+
+static int external_bus_switch(struct i2c_client *extender, int go8bit)
+{
+	if (! extender)
+		return -ENODEV;
+
+#ifdef CONFIG_MT9M001_PCA9536_SWITCH
+	return pca9536_set_level(extender, 0, go8bit);
+#else
+	return -ENODEV;
+#endif
+}
+
+static int mt9m001_set_capture_format(struct soc_camera_device *icd, __u32 pixfmt,
+				      struct v4l2_rect *rect, unsigned int flags)
+{
+	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+	unsigned int width_flag = flags & (IS_DATAWIDTH_10 | IS_DATAWIDTH_9 |
+					   IS_DATAWIDTH_8);
+	int ret;
+	const u16 hblank = 9, vblank = 25;
+
+	/* MT9M001 has all capture_format parameters fixed */
+	if (! (flags & IS_MASTER) ||
+	    ! (flags & IS_PCLK_SAMPLE_RISING) ||
+	    ! (flags & IS_HSYNC_ACTIVE_HIGH) ||
+	    ! (flags & IS_VSYNC_ACTIVE_HIGH)) {
+		return -EINVAL;
+	}
+
+	/* Only one width bit may be set */
+	if (!is_power_of_2(width_flag))
+		return -EINVAL;
+
+	if ((mt9m001->datawidth != 10 && (width_flag == IS_DATAWIDTH_10)) ||
+	    (mt9m001->datawidth != 9  && (width_flag == IS_DATAWIDTH_9)) ||
+	    (mt9m001->datawidth != 8  && (width_flag == IS_DATAWIDTH_8))) {
+		/* data width switch requested */
+		if (! mt9m001->data_switch)
+			return -EINVAL;
+
+		/* Well, we actually only can do 10 or 8 bits... */
+		if (width_flag == IS_DATAWIDTH_9)
+			return -EINVAL;
+		ret = external_bus_switch(mt9m001->data_switch,
+					  width_flag == IS_DATAWIDTH_8);
+		if (ret < 0)
+			return ret;
+
+		mt9m001->datawidth = width_flag == IS_DATAWIDTH_8 ? 8 : 10;
+	}
+
+	/* Blanking and start values - default... */
+	ret = reg_write(icd, MT9M001_HORIZONTAL_BLANKING, hblank);
+	if (ret >= 0)
+		ret = reg_write(icd, MT9M001_VERTICAL_BLANKING, vblank);
+
+	/* The caller provides a supported format, as verified per
+	 * call to icd->try_fmt_cap() */
+	if (ret >= 0)
+		ret = reg_write(icd, MT9M001_COLUMN_START, rect->left);
+	if (ret >= 0)
+		ret = reg_write(icd, MT9M001_ROW_START, rect->top);
+	if (ret >= 0)
+		ret = reg_write(icd, MT9M001_WINDOW_WIDTH, rect->width - 1);
+	if (ret >= 0)
+		ret = reg_write(icd, MT9M001_WINDOW_HEIGHT, rect->height + icd->y_skip_top - 1);
+	if (ret >= 0 && mt9m001->autoexposure) {
+		ret = reg_write(icd, MT9M001_SHUTTER_WIDTH, rect->height + icd->y_skip_top + vblank);
+		if (ret >= 0) {
+			const struct v4l2_queryctrl *qctrl =
+				soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
+			icd->exposure = (524 + (rect->height + icd->y_skip_top + vblank - 1) *
+					 (qctrl->maximum - qctrl->minimum)) /
+				1048 + qctrl->minimum;
+		}
+	}
+
+	return ret < 0 ? ret : 0;
+}
+
+static int mt9m001_try_fmt_cap(struct soc_camera_device *icd,
+			       struct v4l2_format *f)
+{
+	if (f->fmt.pix.height < 32 + icd->y_skip_top)
+		f->fmt.pix.height = 32 + icd->y_skip_top;
+	if (f->fmt.pix.height > 1024 + icd->y_skip_top)
+		f->fmt.pix.height = 1024 + icd->y_skip_top;
+	if (f->fmt.pix.width < 48)
+		f->fmt.pix.width = 48;
+	if (f->fmt.pix.width > 1280)
+		f->fmt.pix.width = 1280;
+	f->fmt.pix.width &= ~0x01; /* has to be even, unsure why was ~3 */
+
+	return 0;
+}
+
+static unsigned int mt9m001_get_datawidth(struct soc_camera_device *icd)
+{
+	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+	return mt9m001->datawidth;
+}
+
+const struct v4l2_queryctrl mt9m001_controls[] = {
+	{
+		.id		= V4L2_CID_VFLIP,
+		.type		= V4L2_CTRL_TYPE_BOOLEAN,
+		.name		= "Flip Vertically",
+		.minimum	= 0,
+		.maximum	= 1,
+		.step		= 1,
+		.default_value	= 0,
+	}, {
+		.id		= V4L2_CID_GAIN,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "Gain",
+		.minimum	= 0,
+		.maximum	= 127,
+		.step		= 1,
+		.default_value	= 64,
+		.flags		= V4L2_CTRL_FLAG_SLIDER,
+	}, {
+		.id		= V4L2_CID_EXPOSURE,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "Exposure",
+		.minimum	= 1,
+		.maximum	= 255,
+		.step		= 1,
+		.default_value	= 255,
+		.flags		= V4L2_CTRL_FLAG_SLIDER,
+	}, {
+		.id		= V4L2_CID_AUTOEXPOSURE,
+		.type		= V4L2_CTRL_TYPE_BOOLEAN,
+		.name		= "Automatic Exposure",
+		.minimum	= 0,
+		.maximum	= 1,
+		.step		= 1,
+		.default_value	= 1,
+	}, {
+		.id		= V4L2_CID_PRIVATE_BASE,
+		.type		= V4L2_CTRL_TYPE_INTEGER,
+		.name		= "Register access",
+		.minimum	= reg_to_int(REG_READ, 0, 0),
+		.maximum	= reg_to_int(REG_WRITE, 0xff, (1 << 16) - 1),
+		.step		= 1,
+		.default_value	= 1,
+	}
+};
+
+static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl);
+static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl);
+
+static struct soc_camera_ops mt9m001_ops = {
+	.owner			= THIS_MODULE,
+	.init			= mt9m001_init,
+	.release		= mt9m001_release,
+	.start_capture		= mt9m001_start_capture,
+	.stop_capture		= mt9m001_stop_capture,
+	.set_capture_format	= mt9m001_set_capture_format,
+	.try_fmt_cap		= mt9m001_try_fmt_cap,
+	.formats		= NULL, /* Filled in later depending on the */
+	.num_formats		= 0,	/* camera type and data widths */
+	.get_datawidth		= mt9m001_get_datawidth,
+	.controls		= mt9m001_controls,
+	.num_controls		= ARRAY_SIZE(mt9m001_controls),
+	.get_control		= mt9m001_get_control,
+	.set_control		= mt9m001_set_control,
+};
+
+static int mt9m001_get_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
+{
+	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+	int data;
+
+	switch (ctrl->id) {
+	case V4L2_CID_VFLIP:
+		data = reg_read(icd, MT9M001_READ_OPTIONS2);
+		if (data < 0)
+			return -EIO;
+		ctrl->value = !!(data & 0x8000);
+		break;
+	case V4L2_CID_AUTOEXPOSURE:
+		ctrl->value = mt9m001->autoexposure;
+		break;
+	case V4L2_CID_PRIVATE_BASE:
+		if (1) {
+			union reg_access_32 u;
+
+			u.ctrl = ctrl->value;
+			if (u.reg.rw != REG_READ)
+				return -EINVAL;
+			data = reg_read(icd, u.reg.address);
+			if (data < 0)
+				return -EIO;
+			u.reg.value = data;
+			ctrl->value = u.ctrl;
+		}
+	}
+	return 0;
+}
+
+static int mt9m001_set_control(struct soc_camera_device *icd, struct v4l2_control *ctrl)
+{
+	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+	const struct v4l2_queryctrl *qctrl;
+	int data;
+
+	qctrl = soc_camera_find_qctrl(&mt9m001_ops, ctrl->id);
+
+	if (!qctrl)
+		return -EINVAL;
+
+	switch (ctrl->id) {
+	case V4L2_CID_VFLIP:
+		if (ctrl->value)
+			data = reg_set(icd, MT9M001_READ_OPTIONS2, 0x8000);
+		else
+			data = reg_clear(icd, MT9M001_READ_OPTIONS2, 0x8000);
+		if (data < 0)
+			return -EIO;
+		break;
+	case V4L2_CID_GAIN:
+		if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
+			return -EINVAL;
+		/* See Datasheet Table 7, Gain settings. */
+		if (ctrl->value <= qctrl->default_value) {
+			/* Pack it into 0..1 step 0.125, register values 0..8 */
+			unsigned long range = qctrl->default_value - qctrl->minimum;
+			data = ((ctrl->value - qctrl->minimum) * 8 + range / 2) / range;
+
+			printk("Setting gain %d\n", data);
+			data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
+			if (data < 0)
+				return -EIO;
+		} else {
+			/* Pack it into 1.125..15 variable step, register values 9..67 */
+			/* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
+			unsigned long range = qctrl->maximum - qctrl->default_value - 1;
+			unsigned long gain = ((ctrl->value - qctrl->default_value - 1) *
+					       111 + range / 2) / range + 9;
+
+			if (gain <= 32)
+				data = gain;
+			else if (gain <= 64)
+				data = ((gain - 32) * 16 + 16) / 32 + 80;
+			else
+				data = ((gain - 64) * 7 + 28) / 56 + 96;
+
+			dev_info(&icd->dev, "Setting gain from %d to %d\n",
+				 reg_read(icd, MT9M001_GLOBAL_GAIN), data);
+			data = reg_write(icd, MT9M001_GLOBAL_GAIN, data);
+			if (data < 0)
+				return -EIO;
+		}
+
+		/* Success */
+		icd->gain = ctrl->value;
+		break;
+	case V4L2_CID_EXPOSURE:
+		/* mt9m001 has maximum == default */
+		if (ctrl->value > qctrl->maximum || ctrl->value < qctrl->minimum)
+			return -EINVAL;
+		else {
+			unsigned long range = qctrl->maximum - qctrl->minimum;
+			unsigned long shutter = ((ctrl->value - qctrl->minimum) * 1048 +
+						 range / 2) / range + 1;
+
+			dev_info(&icd->dev, "Setting shutter width from %d to %lu\n",
+				 reg_read(icd, MT9M001_SHUTTER_WIDTH), shutter);
+			if (reg_write(icd, MT9M001_SHUTTER_WIDTH, shutter) < 0)
+				return -EIO;
+			icd->exposure = ctrl->value;
+			mt9m001->autoexposure = 0;
+		}
+		break;
+	case V4L2_CID_AUTOEXPOSURE:
+		if (ctrl->value) {
+			const u16 vblank = 25;
+			if (reg_write(icd, MT9M001_SHUTTER_WIDTH, icd->height +
+				      icd->y_skip_top + vblank) < 0)
+				return -EIO;
+			qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
+			icd->exposure = (524 + (icd->height + icd->y_skip_top + vblank - 1) *
+					 (qctrl->maximum - qctrl->minimum)) /
+				1048 + qctrl->minimum;
+			mt9m001->autoexposure = 1;
+		} else
+			mt9m001->autoexposure = 0;
+		break;
+	case V4L2_CID_PRIVATE_BASE:
+		if (1) {
+			union reg_access_32 u;
+
+			u.ctrl = ctrl->value;
+			if (u.reg.rw != REG_WRITE)
+				return -EINVAL;
+			data = reg_write(icd, u.reg.address, u.reg.value);
+			if (data < 0)
+				return -EIO;
+		}
+	}
+	return 0;
+}
+
+/* Interface active, can use i2c. If it fails, it can indeed mean, that
+ * this wasn't our capture interface, so, we wait for the right one */
+static int mt9m001_video_probe(struct soc_camera_device *icd)
+{
+	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+	s32 data;
+	int ret;
+
+	/* We must have a parent by now. And it cannot be a wrong one.
+	 * So this entire test is completely redundant. */
+	if (!icd->dev.parent ||
+	    to_soc_camera_host(icd->dev.parent)->nr != icd->iface)
+		return -ENODEV;
+
+	/* Enable the chip */
+	data = reg_write(&mt9m001->icd, MT9M001_CHIP_ENABLE, 1);
+	dev_dbg(&icd->dev, "write: %d\n", data);
+
+	/* Read out the chip version register */
+	data = reg_read(icd, MT9M001_CHIP_VERSION);
+
+	/* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
+	switch (data) {
+	case 0x8411:
+	case 0x8421:
+		mt9m001->model = MT9M001C12ST;
+		mt9m001_ops.formats = mt9m001_colour_formats;
+		mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_colour_formats);
+		break;
+	case 0x8431:
+		mt9m001->model = MT9M001C12STM;
+		mt9m001_ops.formats = mt9m001_monochrome_formats;
+		if (mt9m001->client->dev.platform_data)
+			mt9m001_ops.num_formats = ARRAY_SIZE(mt9m001_monochrome_formats);
+		else
+			mt9m001_ops.num_formats = 1;
+		break;
+	default:
+		ret = -ENODEV;
+		dev_err(&icd->dev,
+			"No MT9M001 chip detected, register read %x\n", data);
+		goto ei2c;
+	}
+
+	dev_info(&icd->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
+		 data == 0x8431 ? "C12STM" : "C12ST");
+
+	/* Now that we know the model, we can start video */
+	ret = soc_camera_video_start(icd);
+	if (ret)
+		goto eisis;
+
+	return 0;
+
+eisis:
+ei2c:
+	return ret;
+}
+
+static void mt9m001_video_remove(struct soc_camera_device *icd)
+{
+	struct mt9m001 *mt9m001 = container_of(icd, struct mt9m001, icd);
+
+	dev_dbg(&icd->dev, "Video %x removed: %p, %p\n", mt9m001->client->addr,
+		mt9m001->icd.dev.parent, mt9m001->icd.vdev);
+	soc_camera_video_stop(&mt9m001->icd);
+}
+
+static int mt9m001_probe(struct i2c_client *client)
+{
+	struct mt9m001 *mt9m001;
+	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
+	int ret;
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
+		pr_debug("%s: I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n", __FUNCTION__);
+		return -EIO;
+	}
+
+	if (!(mt9m001 = kzalloc(sizeof(struct mt9m001), GFP_KERNEL)))
+		return -ENOMEM;
+
+	mt9m001->client = client;
+	i2c_set_clientdata(client, mt9m001);
+
+	/* Second stage probe - when a capture adapter is there */
+	mt9m001->icd.probe	= mt9m001_video_probe;
+	mt9m001->icd.remove	= mt9m001_video_remove;
+	mt9m001->icd.ops	= &mt9m001_ops;
+	mt9m001->icd.control	= &client->dev;
+	mt9m001->icd.x_min	= 20;
+	mt9m001->icd.y_min	= 12;
+	mt9m001->icd.x_current	= 20;
+	mt9m001->icd.y_current	= 12;
+	mt9m001->icd.width_min	= 48;
+	mt9m001->icd.width_max	= 1280;
+	mt9m001->icd.height_min	= 32;
+	mt9m001->icd.height_max	= 1024;
+	mt9m001->icd.y_skip_top	= 1;
+	/* Default datawidth - this is the only width this camera (normally)
+	 * supports. It is only with extra logic that it can support
+	 * other widths. Therefore it seems to be a sensible default. */
+	mt9m001->datawidth = 10;
+	/* Simulated autoexposure. If enabled, we calculate shutter width
+	 * ourselves in the driver based on vertical blanking and frame width */
+	mt9m001->autoexposure = 1;
+
+	if (client->dev.platform_data) {
+		struct soc_camera_link *icl = client->dev.platform_data;
+		/* We have a data bus switch. We call pca9536 functions
+		 * explicitly by name so the driver will not be unloaded,
+		 * and we'll check mt9m001->data_switch anyway every time
+		 * before calling. The only concern is that the driver
+		 * doesn't detach itself from the device, but so far it is
+		 * not supported by the I2C layer */
+		if (icl->extender)
+			mt9m001->data_switch	= *icl->extender;
+		mt9m001->icd.iface	= icl->bus_id;
+	}
+
+	ret = soc_camera_device_register(&mt9m001->icd);
+	if (ret)
+		goto eisdr;
+
+	return 0;
+
+eisdr:
+	kfree(mt9m001);
+	return ret;
+}
+
+static int mt9m001_remove(struct i2c_client *client)
+{
+	struct mt9m001 *mt9m001 = i2c_get_clientdata(client);
+
+	soc_camera_device_unregister(&mt9m001->icd);
+	kfree(mt9m001);
+
+	return 0;
+}
+
+static struct i2c_driver mt9m001_i2c_driver = {
+	.driver = {
+		.name = "mt9m001",
+	},
+	.probe		= mt9m001_probe,
+	.remove		= mt9m001_remove,
+};
+
+static int __init mt9m001_mod_init(void)
+{
+	return i2c_add_driver(&mt9m001_i2c_driver);
+}
+
+static void __exit mt9m001_mod_exit(void)
+{
+	i2c_del_driver(&mt9m001_i2c_driver);
+}
+
+module_init(mt9m001_mod_init);
+module_exit(mt9m001_mod_exit);
+
+MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
+MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
+MODULE_LICENSE("GPL");
-- 
1.5.3.4

--
video4linux-list mailing list
Unsubscribe mailto:video4linux-list-request@redhat.com?subject=unsubscribe
https://www.redhat.com/mailman/listinfo/video4linux-list