![Javier Martin](/assets/img/avatar_default.png)
And added a missing kfree to clean up the via_camera struct. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Javier Martin <javier.martin@vista-silicon.com> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
1483 lines
37 KiB
C
1483 lines
37 KiB
C
/*
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* Driver for the VIA Chrome integrated camera controller.
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*
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* Copyright 2009,2010 Jonathan Corbet <corbet@lwn.net>
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* Distributable under the terms of the GNU General Public License, version 2
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*
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* This work was supported by the One Laptop Per Child project
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/pci.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-chip-ident.h>
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#include <media/v4l2-ctrls.h>
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#include <media/ov7670.h>
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#include <media/videobuf-dma-sg.h>
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/pm_qos.h>
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#include <linux/via-core.h>
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#include <linux/via-gpio.h>
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#include <linux/via_i2c.h>
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#include <asm/olpc.h>
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#include "via-camera.h"
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MODULE_ALIAS("platform:viafb-camera");
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MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
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MODULE_DESCRIPTION("VIA framebuffer-based camera controller driver");
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MODULE_LICENSE("GPL");
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static bool flip_image;
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module_param(flip_image, bool, 0444);
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MODULE_PARM_DESC(flip_image,
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"If set, the sensor will be instructed to flip the image "
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"vertically.");
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static bool override_serial;
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module_param(override_serial, bool, 0444);
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MODULE_PARM_DESC(override_serial,
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"The camera driver will normally refuse to load if "
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"the XO 1.5 serial port is enabled. Set this option "
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"to force-enable the camera.");
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/*
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* Basic window sizes.
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*/
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#define VGA_WIDTH 640
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#define VGA_HEIGHT 480
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#define QCIF_WIDTH 176
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#define QCIF_HEIGHT 144
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/*
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* The structure describing our camera.
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*/
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enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 };
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struct via_camera {
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struct v4l2_device v4l2_dev;
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struct v4l2_ctrl_handler ctrl_handler;
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struct video_device vdev;
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struct v4l2_subdev *sensor;
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struct platform_device *platdev;
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struct viafb_dev *viadev;
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struct mutex lock;
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enum viacam_opstate opstate;
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unsigned long flags;
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struct pm_qos_request qos_request;
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/*
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* GPIO info for power/reset management
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*/
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int power_gpio;
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int reset_gpio;
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/*
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* I/O memory stuff.
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*/
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void __iomem *mmio; /* Where the registers live */
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void __iomem *fbmem; /* Frame buffer memory */
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u32 fb_offset; /* Reserved memory offset (FB) */
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/*
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* Capture buffers and related. The controller supports
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* up to three, so that's what we have here. These buffers
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* live in frame buffer memory, so we don't call them "DMA".
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*/
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unsigned int cb_offsets[3]; /* offsets into fb mem */
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u8 *cb_addrs[3]; /* Kernel-space addresses */
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int n_cap_bufs; /* How many are we using? */
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int next_buf;
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struct videobuf_queue vb_queue;
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struct list_head buffer_queue; /* prot. by reg_lock */
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/*
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* User tracking.
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*/
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int users;
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struct file *owner;
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/*
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* Video format information. sensor_format is kept in a form
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* that we can use to pass to the sensor. We always run the
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* sensor in VGA resolution, though, and let the controller
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* downscale things if need be. So we keep the "real*
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* dimensions separately.
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*/
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struct v4l2_pix_format sensor_format;
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struct v4l2_pix_format user_format;
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enum v4l2_mbus_pixelcode mbus_code;
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};
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/*
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* Yes, this is a hack, but there's only going to be one of these
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* on any system we know of.
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*/
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static struct via_camera *via_cam_info;
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/*
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* Flag values, manipulated with bitops
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*/
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#define CF_DMA_ACTIVE 0 /* A frame is incoming */
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#define CF_CONFIG_NEEDED 1 /* Must configure hardware */
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/*
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* Nasty ugly v4l2 boilerplate.
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*/
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#define sensor_call(cam, optype, func, args...) \
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v4l2_subdev_call(cam->sensor, optype, func, ##args)
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/*
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* Debugging and related.
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*/
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#define cam_err(cam, fmt, arg...) \
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dev_err(&(cam)->platdev->dev, fmt, ##arg);
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#define cam_warn(cam, fmt, arg...) \
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dev_warn(&(cam)->platdev->dev, fmt, ##arg);
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#define cam_dbg(cam, fmt, arg...) \
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dev_dbg(&(cam)->platdev->dev, fmt, ##arg);
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/*
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* Format handling. This is ripped almost directly from Hans's changes
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* to cafe_ccic.c. It's a little unfortunate; until this change, we
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* didn't need to know anything about the format except its byte depth;
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* now this information must be managed at this level too.
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*/
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static struct via_format {
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__u8 *desc;
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__u32 pixelformat;
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int bpp; /* Bytes per pixel */
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enum v4l2_mbus_pixelcode mbus_code;
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} via_formats[] = {
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{
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.desc = "YUYV 4:2:2",
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.pixelformat = V4L2_PIX_FMT_YUYV,
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.mbus_code = V4L2_MBUS_FMT_YUYV8_2X8,
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.bpp = 2,
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},
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/* RGB444 and Bayer should be doable, but have never been
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tested with this driver. RGB565 seems to work at the default
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resolution, but results in color corruption when being scaled by
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viacam_set_scaled(), and is disabled as a result. */
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};
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#define N_VIA_FMTS ARRAY_SIZE(via_formats)
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static struct via_format *via_find_format(u32 pixelformat)
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{
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unsigned i;
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for (i = 0; i < N_VIA_FMTS; i++)
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if (via_formats[i].pixelformat == pixelformat)
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return via_formats + i;
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/* Not found? Then return the first format. */
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return via_formats;
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}
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/*--------------------------------------------------------------------------*/
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/*
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* Sensor power/reset management. This piece is OLPC-specific for
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* sure; other configurations will have things connected differently.
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*/
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static int via_sensor_power_setup(struct via_camera *cam)
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{
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int ret;
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cam->power_gpio = viafb_gpio_lookup("VGPIO3");
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cam->reset_gpio = viafb_gpio_lookup("VGPIO2");
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if (cam->power_gpio < 0 || cam->reset_gpio < 0) {
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dev_err(&cam->platdev->dev, "Unable to find GPIO lines\n");
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return -EINVAL;
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}
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ret = gpio_request(cam->power_gpio, "viafb-camera");
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if (ret) {
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dev_err(&cam->platdev->dev, "Unable to request power GPIO\n");
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return ret;
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}
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ret = gpio_request(cam->reset_gpio, "viafb-camera");
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if (ret) {
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dev_err(&cam->platdev->dev, "Unable to request reset GPIO\n");
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gpio_free(cam->power_gpio);
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return ret;
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}
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gpio_direction_output(cam->power_gpio, 0);
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gpio_direction_output(cam->reset_gpio, 0);
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return 0;
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}
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/*
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* Power up the sensor and perform the reset dance.
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*/
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static void via_sensor_power_up(struct via_camera *cam)
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{
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gpio_set_value(cam->power_gpio, 1);
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gpio_set_value(cam->reset_gpio, 0);
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msleep(20); /* Probably excessive */
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gpio_set_value(cam->reset_gpio, 1);
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msleep(20);
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}
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static void via_sensor_power_down(struct via_camera *cam)
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{
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gpio_set_value(cam->power_gpio, 0);
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gpio_set_value(cam->reset_gpio, 0);
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}
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static void via_sensor_power_release(struct via_camera *cam)
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{
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via_sensor_power_down(cam);
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gpio_free(cam->power_gpio);
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gpio_free(cam->reset_gpio);
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}
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/* --------------------------------------------------------------------------*/
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/* Sensor ops */
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/*
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* Manage the ov7670 "flip" bit, which needs special help.
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*/
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static int viacam_set_flip(struct via_camera *cam)
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{
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struct v4l2_control ctrl;
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memset(&ctrl, 0, sizeof(ctrl));
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ctrl.id = V4L2_CID_VFLIP;
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ctrl.value = flip_image;
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return sensor_call(cam, core, s_ctrl, &ctrl);
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}
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/*
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* Configure the sensor. It's up to the caller to ensure
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* that the camera is in the correct operating state.
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*/
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static int viacam_configure_sensor(struct via_camera *cam)
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{
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struct v4l2_mbus_framefmt mbus_fmt;
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int ret;
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v4l2_fill_mbus_format(&mbus_fmt, &cam->sensor_format, cam->mbus_code);
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ret = sensor_call(cam, core, init, 0);
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if (ret == 0)
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ret = sensor_call(cam, video, s_mbus_fmt, &mbus_fmt);
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/*
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* OV7670 does weird things if flip is set *before* format...
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*/
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if (ret == 0)
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ret = viacam_set_flip(cam);
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return ret;
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}
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/* --------------------------------------------------------------------------*/
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/*
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* Some simple register accessors; they assume that the lock is held.
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*
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* Should we want to support the second capture engine, we could
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* hide the register difference by adding 0x1000 to registers in the
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* 0x300-350 range.
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*/
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static inline void viacam_write_reg(struct via_camera *cam,
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int reg, int value)
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{
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iowrite32(value, cam->mmio + reg);
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}
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static inline int viacam_read_reg(struct via_camera *cam, int reg)
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{
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return ioread32(cam->mmio + reg);
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}
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static inline void viacam_write_reg_mask(struct via_camera *cam,
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int reg, int value, int mask)
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{
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int tmp = viacam_read_reg(cam, reg);
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tmp = (tmp & ~mask) | (value & mask);
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viacam_write_reg(cam, reg, tmp);
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}
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/* --------------------------------------------------------------------------*/
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/* Interrupt management and handling */
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static irqreturn_t viacam_quick_irq(int irq, void *data)
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{
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struct via_camera *cam = data;
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irqreturn_t ret = IRQ_NONE;
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int icv;
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/*
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* All we do here is to clear the interrupts and tell
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* the handler thread to wake up.
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*/
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spin_lock(&cam->viadev->reg_lock);
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icv = viacam_read_reg(cam, VCR_INTCTRL);
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if (icv & VCR_IC_EAV) {
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icv |= VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL;
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viacam_write_reg(cam, VCR_INTCTRL, icv);
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ret = IRQ_WAKE_THREAD;
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}
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spin_unlock(&cam->viadev->reg_lock);
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return ret;
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}
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/*
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* Find the next videobuf buffer which has somebody waiting on it.
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*/
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static struct videobuf_buffer *viacam_next_buffer(struct via_camera *cam)
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{
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unsigned long flags;
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struct videobuf_buffer *buf = NULL;
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spin_lock_irqsave(&cam->viadev->reg_lock, flags);
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if (cam->opstate != S_RUNNING)
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goto out;
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if (list_empty(&cam->buffer_queue))
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goto out;
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buf = list_entry(cam->buffer_queue.next, struct videobuf_buffer, queue);
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if (!waitqueue_active(&buf->done)) {/* Nobody waiting */
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buf = NULL;
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goto out;
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}
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list_del(&buf->queue);
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buf->state = VIDEOBUF_ACTIVE;
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out:
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spin_unlock_irqrestore(&cam->viadev->reg_lock, flags);
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return buf;
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}
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/*
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* The threaded IRQ handler.
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*/
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static irqreturn_t viacam_irq(int irq, void *data)
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{
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int bufn;
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struct videobuf_buffer *vb;
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struct via_camera *cam = data;
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struct videobuf_dmabuf *vdma;
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/*
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* If there is no place to put the data frame, don't bother
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* with anything else.
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*/
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vb = viacam_next_buffer(cam);
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if (vb == NULL)
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goto done;
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/*
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* Figure out which buffer we just completed.
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*/
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bufn = (viacam_read_reg(cam, VCR_INTCTRL) & VCR_IC_ACTBUF) >> 3;
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bufn -= 1;
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if (bufn < 0)
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bufn = cam->n_cap_bufs - 1;
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/*
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* Copy over the data and let any waiters know.
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*/
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vdma = videobuf_to_dma(vb);
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viafb_dma_copy_out_sg(cam->cb_offsets[bufn], vdma->sglist, vdma->sglen);
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vb->state = VIDEOBUF_DONE;
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vb->size = cam->user_format.sizeimage;
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wake_up(&vb->done);
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done:
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return IRQ_HANDLED;
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}
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/*
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* These functions must mess around with the general interrupt
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* control register, which is relevant to much more than just the
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* camera. Nothing else uses interrupts, though, as of this writing.
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* Should that situation change, we'll have to improve support at
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* the via-core level.
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*/
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static void viacam_int_enable(struct via_camera *cam)
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{
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viacam_write_reg(cam, VCR_INTCTRL,
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VCR_IC_INTEN|VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL);
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viafb_irq_enable(VDE_I_C0AVEN);
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}
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static void viacam_int_disable(struct via_camera *cam)
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{
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viafb_irq_disable(VDE_I_C0AVEN);
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viacam_write_reg(cam, VCR_INTCTRL, 0);
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}
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/* --------------------------------------------------------------------------*/
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/* Controller operations */
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/*
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* Set up our capture buffers in framebuffer memory.
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*/
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static int viacam_ctlr_cbufs(struct via_camera *cam)
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{
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int nbuf = cam->viadev->camera_fbmem_size/cam->sensor_format.sizeimage;
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int i;
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unsigned int offset;
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/*
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* See how many buffers we can work with.
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*/
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if (nbuf >= 3) {
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cam->n_cap_bufs = 3;
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viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_3BUFS,
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VCR_CI_3BUFS);
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} else if (nbuf == 2) {
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cam->n_cap_bufs = 2;
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viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_3BUFS);
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} else {
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cam_warn(cam, "Insufficient frame buffer memory\n");
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return -ENOMEM;
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}
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/*
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* Set them up.
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*/
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offset = cam->fb_offset;
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for (i = 0; i < cam->n_cap_bufs; i++) {
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cam->cb_offsets[i] = offset;
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cam->cb_addrs[i] = cam->fbmem + offset;
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viacam_write_reg(cam, VCR_VBUF1 + i*4, offset & VCR_VBUF_MASK);
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offset += cam->sensor_format.sizeimage;
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}
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return 0;
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}
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/*
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* Set the scaling register for downscaling the image.
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*
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* This register works like this... Vertical scaling is enabled
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* by bit 26; if that bit is set, downscaling is controlled by the
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* value in bits 16:25. Those bits are divided by 1024 to get
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* the scaling factor; setting just bit 25 thus cuts the height
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* in half.
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*
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* Horizontal scaling works about the same, but it's enabled by
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* bit 11, with bits 0:10 giving the numerator of a fraction
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* (over 2048) for the scaling value.
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*
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* This function is naive in that, if the user departs from
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* the 3x4 VGA scaling factor, the image will distort. We
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* could work around that if it really seemed important.
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*/
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static void viacam_set_scale(struct via_camera *cam)
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{
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unsigned int avscale;
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int sf;
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if (cam->user_format.width == VGA_WIDTH)
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avscale = 0;
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else {
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sf = (cam->user_format.width*2048)/VGA_WIDTH;
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avscale = VCR_AVS_HEN | sf;
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}
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if (cam->user_format.height < VGA_HEIGHT) {
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sf = (1024*cam->user_format.height)/VGA_HEIGHT;
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avscale |= VCR_AVS_VEN | (sf << 16);
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}
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viacam_write_reg(cam, VCR_AVSCALE, avscale);
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}
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/*
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* Configure image-related information into the capture engine.
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*/
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static void viacam_ctlr_image(struct via_camera *cam)
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{
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int cicreg;
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/*
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* Disable clock before messing with stuff - from the via
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* sample driver.
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*/
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viacam_write_reg(cam, VCR_CAPINTC, ~(VCR_CI_ENABLE|VCR_CI_CLKEN));
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/*
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* Set up the controller for VGA resolution, modulo magic
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* offsets from the via sample driver.
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*/
|
|
viacam_write_reg(cam, VCR_HORRANGE, 0x06200120);
|
|
viacam_write_reg(cam, VCR_VERTRANGE, 0x01de0000);
|
|
viacam_set_scale(cam);
|
|
/*
|
|
* Image size info.
|
|
*/
|
|
viacam_write_reg(cam, VCR_MAXDATA,
|
|
(cam->sensor_format.height << 16) |
|
|
(cam->sensor_format.bytesperline >> 3));
|
|
viacam_write_reg(cam, VCR_MAXVBI, 0);
|
|
viacam_write_reg(cam, VCR_VSTRIDE,
|
|
cam->user_format.bytesperline & VCR_VS_STRIDE);
|
|
/*
|
|
* Set up the capture interface control register,
|
|
* everything but the "go" bit.
|
|
*
|
|
* The FIFO threshold is a bit of a magic number; 8 is what
|
|
* VIA's sample code uses.
|
|
*/
|
|
cicreg = VCR_CI_CLKEN |
|
|
0x08000000 | /* FIFO threshold */
|
|
VCR_CI_FLDINV | /* OLPC-specific? */
|
|
VCR_CI_VREFINV | /* OLPC-specific? */
|
|
VCR_CI_DIBOTH | /* Capture both fields */
|
|
VCR_CI_CCIR601_8;
|
|
if (cam->n_cap_bufs == 3)
|
|
cicreg |= VCR_CI_3BUFS;
|
|
/*
|
|
* YUV formats need different byte swapping than RGB.
|
|
*/
|
|
if (cam->user_format.pixelformat == V4L2_PIX_FMT_YUYV)
|
|
cicreg |= VCR_CI_YUYV;
|
|
else
|
|
cicreg |= VCR_CI_UYVY;
|
|
viacam_write_reg(cam, VCR_CAPINTC, cicreg);
|
|
}
|
|
|
|
|
|
static int viacam_config_controller(struct via_camera *cam)
|
|
{
|
|
int ret;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cam->viadev->reg_lock, flags);
|
|
ret = viacam_ctlr_cbufs(cam);
|
|
if (!ret)
|
|
viacam_ctlr_image(cam);
|
|
spin_unlock_irqrestore(&cam->viadev->reg_lock, flags);
|
|
clear_bit(CF_CONFIG_NEEDED, &cam->flags);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Make it start grabbing data.
|
|
*/
|
|
static void viacam_start_engine(struct via_camera *cam)
|
|
{
|
|
spin_lock_irq(&cam->viadev->reg_lock);
|
|
cam->next_buf = 0;
|
|
viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_ENABLE, VCR_CI_ENABLE);
|
|
viacam_int_enable(cam);
|
|
(void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */
|
|
cam->opstate = S_RUNNING;
|
|
spin_unlock_irq(&cam->viadev->reg_lock);
|
|
}
|
|
|
|
|
|
static void viacam_stop_engine(struct via_camera *cam)
|
|
{
|
|
spin_lock_irq(&cam->viadev->reg_lock);
|
|
viacam_int_disable(cam);
|
|
viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_ENABLE);
|
|
(void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */
|
|
cam->opstate = S_IDLE;
|
|
spin_unlock_irq(&cam->viadev->reg_lock);
|
|
}
|
|
|
|
|
|
/* --------------------------------------------------------------------------*/
|
|
/* Videobuf callback ops */
|
|
|
|
/*
|
|
* buffer_setup. The purpose of this one would appear to be to tell
|
|
* videobuf how big a single image is. It's also evidently up to us
|
|
* to put some sort of limit on the maximum number of buffers allowed.
|
|
*/
|
|
static int viacam_vb_buf_setup(struct videobuf_queue *q,
|
|
unsigned int *count, unsigned int *size)
|
|
{
|
|
struct via_camera *cam = q->priv_data;
|
|
|
|
*size = cam->user_format.sizeimage;
|
|
if (*count == 0 || *count > 6) /* Arbitrary number */
|
|
*count = 6;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Prepare a buffer.
|
|
*/
|
|
static int viacam_vb_buf_prepare(struct videobuf_queue *q,
|
|
struct videobuf_buffer *vb, enum v4l2_field field)
|
|
{
|
|
struct via_camera *cam = q->priv_data;
|
|
|
|
vb->size = cam->user_format.sizeimage;
|
|
vb->width = cam->user_format.width; /* bytesperline???? */
|
|
vb->height = cam->user_format.height;
|
|
vb->field = field;
|
|
if (vb->state == VIDEOBUF_NEEDS_INIT) {
|
|
int ret = videobuf_iolock(q, vb, NULL);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
vb->state = VIDEOBUF_PREPARED;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We've got a buffer to put data into.
|
|
*
|
|
* FIXME: check for a running engine and valid buffers?
|
|
*/
|
|
static void viacam_vb_buf_queue(struct videobuf_queue *q,
|
|
struct videobuf_buffer *vb)
|
|
{
|
|
struct via_camera *cam = q->priv_data;
|
|
|
|
/*
|
|
* Note that videobuf holds the lock when it calls
|
|
* us, so we need not (indeed, cannot) take it here.
|
|
*/
|
|
vb->state = VIDEOBUF_QUEUED;
|
|
list_add_tail(&vb->queue, &cam->buffer_queue);
|
|
}
|
|
|
|
/*
|
|
* Free a buffer.
|
|
*/
|
|
static void viacam_vb_buf_release(struct videobuf_queue *q,
|
|
struct videobuf_buffer *vb)
|
|
{
|
|
struct via_camera *cam = q->priv_data;
|
|
|
|
videobuf_dma_unmap(&cam->platdev->dev, videobuf_to_dma(vb));
|
|
videobuf_dma_free(videobuf_to_dma(vb));
|
|
vb->state = VIDEOBUF_NEEDS_INIT;
|
|
}
|
|
|
|
static const struct videobuf_queue_ops viacam_vb_ops = {
|
|
.buf_setup = viacam_vb_buf_setup,
|
|
.buf_prepare = viacam_vb_buf_prepare,
|
|
.buf_queue = viacam_vb_buf_queue,
|
|
.buf_release = viacam_vb_buf_release,
|
|
};
|
|
|
|
/* --------------------------------------------------------------------------*/
|
|
/* File operations */
|
|
|
|
static int viacam_open(struct file *filp)
|
|
{
|
|
struct via_camera *cam = video_drvdata(filp);
|
|
|
|
filp->private_data = cam;
|
|
/*
|
|
* Note the new user. If this is the first one, we'll also
|
|
* need to power up the sensor.
|
|
*/
|
|
mutex_lock(&cam->lock);
|
|
if (cam->users == 0) {
|
|
int ret = viafb_request_dma();
|
|
|
|
if (ret) {
|
|
mutex_unlock(&cam->lock);
|
|
return ret;
|
|
}
|
|
via_sensor_power_up(cam);
|
|
set_bit(CF_CONFIG_NEEDED, &cam->flags);
|
|
/*
|
|
* Hook into videobuf. Evidently this cannot fail.
|
|
*/
|
|
videobuf_queue_sg_init(&cam->vb_queue, &viacam_vb_ops,
|
|
&cam->platdev->dev, &cam->viadev->reg_lock,
|
|
V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
|
|
sizeof(struct videobuf_buffer), cam, NULL);
|
|
}
|
|
(cam->users)++;
|
|
mutex_unlock(&cam->lock);
|
|
return 0;
|
|
}
|
|
|
|
static int viacam_release(struct file *filp)
|
|
{
|
|
struct via_camera *cam = video_drvdata(filp);
|
|
|
|
mutex_lock(&cam->lock);
|
|
(cam->users)--;
|
|
/*
|
|
* If the "owner" is closing, shut down any ongoing
|
|
* operations.
|
|
*/
|
|
if (filp == cam->owner) {
|
|
videobuf_stop(&cam->vb_queue);
|
|
/*
|
|
* We don't hold the spinlock here, but, if release()
|
|
* is being called by the owner, nobody else will
|
|
* be changing the state. And an extra stop would
|
|
* not hurt anyway.
|
|
*/
|
|
if (cam->opstate != S_IDLE)
|
|
viacam_stop_engine(cam);
|
|
cam->owner = NULL;
|
|
}
|
|
/*
|
|
* Last one out needs to turn out the lights.
|
|
*/
|
|
if (cam->users == 0) {
|
|
videobuf_mmap_free(&cam->vb_queue);
|
|
via_sensor_power_down(cam);
|
|
viafb_release_dma();
|
|
}
|
|
mutex_unlock(&cam->lock);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read a frame from the device.
|
|
*/
|
|
static ssize_t viacam_read(struct file *filp, char __user *buffer,
|
|
size_t len, loff_t *pos)
|
|
{
|
|
struct via_camera *cam = video_drvdata(filp);
|
|
int ret;
|
|
|
|
mutex_lock(&cam->lock);
|
|
/*
|
|
* Enforce the V4l2 "only one owner gets to read data" rule.
|
|
*/
|
|
if (cam->owner && cam->owner != filp) {
|
|
ret = -EBUSY;
|
|
goto out_unlock;
|
|
}
|
|
cam->owner = filp;
|
|
/*
|
|
* Do we need to configure the hardware?
|
|
*/
|
|
if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) {
|
|
ret = viacam_configure_sensor(cam);
|
|
if (!ret)
|
|
ret = viacam_config_controller(cam);
|
|
if (ret)
|
|
goto out_unlock;
|
|
}
|
|
/*
|
|
* Fire up the capture engine, then have videobuf do
|
|
* the heavy lifting. Someday it would be good to avoid
|
|
* stopping and restarting the engine each time.
|
|
*/
|
|
INIT_LIST_HEAD(&cam->buffer_queue);
|
|
viacam_start_engine(cam);
|
|
ret = videobuf_read_stream(&cam->vb_queue, buffer, len, pos, 0,
|
|
filp->f_flags & O_NONBLOCK);
|
|
viacam_stop_engine(cam);
|
|
/* videobuf_stop() ?? */
|
|
|
|
out_unlock:
|
|
mutex_unlock(&cam->lock);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static unsigned int viacam_poll(struct file *filp, struct poll_table_struct *pt)
|
|
{
|
|
struct via_camera *cam = video_drvdata(filp);
|
|
|
|
return videobuf_poll_stream(filp, &cam->vb_queue, pt);
|
|
}
|
|
|
|
|
|
static int viacam_mmap(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
struct via_camera *cam = video_drvdata(filp);
|
|
|
|
return videobuf_mmap_mapper(&cam->vb_queue, vma);
|
|
}
|
|
|
|
|
|
|
|
static const struct v4l2_file_operations viacam_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = viacam_open,
|
|
.release = viacam_release,
|
|
.read = viacam_read,
|
|
.poll = viacam_poll,
|
|
.mmap = viacam_mmap,
|
|
.unlocked_ioctl = video_ioctl2,
|
|
};
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/*
|
|
* The long list of v4l2 ioctl ops
|
|
*/
|
|
|
|
static int viacam_g_chip_ident(struct file *file, void *priv,
|
|
struct v4l2_dbg_chip_ident *ident)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
|
|
ident->ident = V4L2_IDENT_NONE;
|
|
ident->revision = 0;
|
|
if (v4l2_chip_match_host(&ident->match)) {
|
|
ident->ident = V4L2_IDENT_VIA_VX855;
|
|
return 0;
|
|
}
|
|
return sensor_call(cam, core, g_chip_ident, ident);
|
|
}
|
|
|
|
/*
|
|
* Only one input.
|
|
*/
|
|
static int viacam_enum_input(struct file *filp, void *priv,
|
|
struct v4l2_input *input)
|
|
{
|
|
if (input->index != 0)
|
|
return -EINVAL;
|
|
|
|
input->type = V4L2_INPUT_TYPE_CAMERA;
|
|
input->std = V4L2_STD_ALL; /* Not sure what should go here */
|
|
strcpy(input->name, "Camera");
|
|
return 0;
|
|
}
|
|
|
|
static int viacam_g_input(struct file *filp, void *priv, unsigned int *i)
|
|
{
|
|
*i = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int viacam_s_input(struct file *filp, void *priv, unsigned int i)
|
|
{
|
|
if (i != 0)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
static int viacam_s_std(struct file *filp, void *priv, v4l2_std_id *std)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Video format stuff. Here is our default format until
|
|
* user space messes with things.
|
|
*/
|
|
static const struct v4l2_pix_format viacam_def_pix_format = {
|
|
.width = VGA_WIDTH,
|
|
.height = VGA_HEIGHT,
|
|
.pixelformat = V4L2_PIX_FMT_YUYV,
|
|
.field = V4L2_FIELD_NONE,
|
|
.bytesperline = VGA_WIDTH * 2,
|
|
.sizeimage = VGA_WIDTH * VGA_HEIGHT * 2,
|
|
};
|
|
|
|
static const enum v4l2_mbus_pixelcode via_def_mbus_code = V4L2_MBUS_FMT_YUYV8_2X8;
|
|
|
|
static int viacam_enum_fmt_vid_cap(struct file *filp, void *priv,
|
|
struct v4l2_fmtdesc *fmt)
|
|
{
|
|
if (fmt->index >= N_VIA_FMTS)
|
|
return -EINVAL;
|
|
strlcpy(fmt->description, via_formats[fmt->index].desc,
|
|
sizeof(fmt->description));
|
|
fmt->pixelformat = via_formats[fmt->index].pixelformat;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Figure out proper image dimensions, but always force the
|
|
* sensor to VGA.
|
|
*/
|
|
static void viacam_fmt_pre(struct v4l2_pix_format *userfmt,
|
|
struct v4l2_pix_format *sensorfmt)
|
|
{
|
|
*sensorfmt = *userfmt;
|
|
if (userfmt->width < QCIF_WIDTH || userfmt->height < QCIF_HEIGHT) {
|
|
userfmt->width = QCIF_WIDTH;
|
|
userfmt->height = QCIF_HEIGHT;
|
|
}
|
|
if (userfmt->width > VGA_WIDTH || userfmt->height > VGA_HEIGHT) {
|
|
userfmt->width = VGA_WIDTH;
|
|
userfmt->height = VGA_HEIGHT;
|
|
}
|
|
sensorfmt->width = VGA_WIDTH;
|
|
sensorfmt->height = VGA_HEIGHT;
|
|
}
|
|
|
|
static void viacam_fmt_post(struct v4l2_pix_format *userfmt,
|
|
struct v4l2_pix_format *sensorfmt)
|
|
{
|
|
struct via_format *f = via_find_format(userfmt->pixelformat);
|
|
|
|
sensorfmt->bytesperline = sensorfmt->width * f->bpp;
|
|
sensorfmt->sizeimage = sensorfmt->height * sensorfmt->bytesperline;
|
|
userfmt->pixelformat = sensorfmt->pixelformat;
|
|
userfmt->field = sensorfmt->field;
|
|
userfmt->bytesperline = 2 * userfmt->width;
|
|
userfmt->sizeimage = userfmt->bytesperline * userfmt->height;
|
|
}
|
|
|
|
|
|
/*
|
|
* The real work of figuring out a workable format.
|
|
*/
|
|
static int viacam_do_try_fmt(struct via_camera *cam,
|
|
struct v4l2_pix_format *upix, struct v4l2_pix_format *spix)
|
|
{
|
|
int ret;
|
|
struct v4l2_mbus_framefmt mbus_fmt;
|
|
struct via_format *f = via_find_format(upix->pixelformat);
|
|
|
|
upix->pixelformat = f->pixelformat;
|
|
viacam_fmt_pre(upix, spix);
|
|
v4l2_fill_mbus_format(&mbus_fmt, spix, f->mbus_code);
|
|
ret = sensor_call(cam, video, try_mbus_fmt, &mbus_fmt);
|
|
v4l2_fill_pix_format(spix, &mbus_fmt);
|
|
viacam_fmt_post(upix, spix);
|
|
return ret;
|
|
}
|
|
|
|
|
|
|
|
static int viacam_try_fmt_vid_cap(struct file *filp, void *priv,
|
|
struct v4l2_format *fmt)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
struct v4l2_format sfmt;
|
|
int ret;
|
|
|
|
mutex_lock(&cam->lock);
|
|
ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix);
|
|
mutex_unlock(&cam->lock);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int viacam_g_fmt_vid_cap(struct file *filp, void *priv,
|
|
struct v4l2_format *fmt)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
|
|
mutex_lock(&cam->lock);
|
|
fmt->fmt.pix = cam->user_format;
|
|
mutex_unlock(&cam->lock);
|
|
return 0;
|
|
}
|
|
|
|
static int viacam_s_fmt_vid_cap(struct file *filp, void *priv,
|
|
struct v4l2_format *fmt)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
int ret;
|
|
struct v4l2_format sfmt;
|
|
struct via_format *f = via_find_format(fmt->fmt.pix.pixelformat);
|
|
|
|
/*
|
|
* Camera must be idle or we can't mess with the
|
|
* video setup.
|
|
*/
|
|
mutex_lock(&cam->lock);
|
|
if (cam->opstate != S_IDLE) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
/*
|
|
* Let the sensor code look over and tweak the
|
|
* requested formatting.
|
|
*/
|
|
ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix);
|
|
if (ret)
|
|
goto out;
|
|
/*
|
|
* OK, let's commit to the new format.
|
|
*/
|
|
cam->user_format = fmt->fmt.pix;
|
|
cam->sensor_format = sfmt.fmt.pix;
|
|
cam->mbus_code = f->mbus_code;
|
|
ret = viacam_configure_sensor(cam);
|
|
if (!ret)
|
|
ret = viacam_config_controller(cam);
|
|
out:
|
|
mutex_unlock(&cam->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int viacam_querycap(struct file *filp, void *priv,
|
|
struct v4l2_capability *cap)
|
|
{
|
|
strcpy(cap->driver, "via-camera");
|
|
strcpy(cap->card, "via-camera");
|
|
cap->version = 1;
|
|
cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
|
|
V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Streaming operations - pure videobuf stuff.
|
|
*/
|
|
static int viacam_reqbufs(struct file *filp, void *priv,
|
|
struct v4l2_requestbuffers *rb)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
|
|
return videobuf_reqbufs(&cam->vb_queue, rb);
|
|
}
|
|
|
|
static int viacam_querybuf(struct file *filp, void *priv,
|
|
struct v4l2_buffer *buf)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
|
|
return videobuf_querybuf(&cam->vb_queue, buf);
|
|
}
|
|
|
|
static int viacam_qbuf(struct file *filp, void *priv, struct v4l2_buffer *buf)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
|
|
return videobuf_qbuf(&cam->vb_queue, buf);
|
|
}
|
|
|
|
static int viacam_dqbuf(struct file *filp, void *priv, struct v4l2_buffer *buf)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
|
|
return videobuf_dqbuf(&cam->vb_queue, buf, filp->f_flags & O_NONBLOCK);
|
|
}
|
|
|
|
static int viacam_streamon(struct file *filp, void *priv, enum v4l2_buf_type t)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
int ret = 0;
|
|
|
|
if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&cam->lock);
|
|
if (cam->opstate != S_IDLE) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
/*
|
|
* Enforce the V4l2 "only one owner gets to read data" rule.
|
|
*/
|
|
if (cam->owner && cam->owner != filp) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
cam->owner = filp;
|
|
/*
|
|
* Configure things if need be.
|
|
*/
|
|
if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) {
|
|
ret = viacam_configure_sensor(cam);
|
|
if (ret)
|
|
goto out;
|
|
ret = viacam_config_controller(cam);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
/*
|
|
* If the CPU goes into C3, the DMA transfer gets corrupted and
|
|
* users start filing unsightly bug reports. Put in a "latency"
|
|
* requirement which will keep the CPU out of the deeper sleep
|
|
* states.
|
|
*/
|
|
pm_qos_add_request(&cam->qos_request, PM_QOS_CPU_DMA_LATENCY, 50);
|
|
/*
|
|
* Fire things up.
|
|
*/
|
|
INIT_LIST_HEAD(&cam->buffer_queue);
|
|
ret = videobuf_streamon(&cam->vb_queue);
|
|
if (!ret)
|
|
viacam_start_engine(cam);
|
|
out:
|
|
mutex_unlock(&cam->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int viacam_streamoff(struct file *filp, void *priv, enum v4l2_buf_type t)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
int ret;
|
|
|
|
if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE)
|
|
return -EINVAL;
|
|
mutex_lock(&cam->lock);
|
|
if (cam->opstate != S_RUNNING) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
pm_qos_remove_request(&cam->qos_request);
|
|
viacam_stop_engine(cam);
|
|
/*
|
|
* Videobuf will recycle all of the outstanding buffers, but
|
|
* we should be sure we don't retain any references to
|
|
* any of them.
|
|
*/
|
|
ret = videobuf_streamoff(&cam->vb_queue);
|
|
INIT_LIST_HEAD(&cam->buffer_queue);
|
|
out:
|
|
mutex_unlock(&cam->lock);
|
|
return ret;
|
|
}
|
|
|
|
/* G/S_PARM */
|
|
|
|
static int viacam_g_parm(struct file *filp, void *priv,
|
|
struct v4l2_streamparm *parm)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
int ret;
|
|
|
|
mutex_lock(&cam->lock);
|
|
ret = sensor_call(cam, video, g_parm, parm);
|
|
mutex_unlock(&cam->lock);
|
|
parm->parm.capture.readbuffers = cam->n_cap_bufs;
|
|
return ret;
|
|
}
|
|
|
|
static int viacam_s_parm(struct file *filp, void *priv,
|
|
struct v4l2_streamparm *parm)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
int ret;
|
|
|
|
mutex_lock(&cam->lock);
|
|
ret = sensor_call(cam, video, s_parm, parm);
|
|
mutex_unlock(&cam->lock);
|
|
parm->parm.capture.readbuffers = cam->n_cap_bufs;
|
|
return ret;
|
|
}
|
|
|
|
static int viacam_enum_framesizes(struct file *filp, void *priv,
|
|
struct v4l2_frmsizeenum *sizes)
|
|
{
|
|
if (sizes->index != 0)
|
|
return -EINVAL;
|
|
sizes->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
|
|
sizes->stepwise.min_width = QCIF_WIDTH;
|
|
sizes->stepwise.min_height = QCIF_HEIGHT;
|
|
sizes->stepwise.max_width = VGA_WIDTH;
|
|
sizes->stepwise.max_height = VGA_HEIGHT;
|
|
sizes->stepwise.step_width = sizes->stepwise.step_height = 1;
|
|
return 0;
|
|
}
|
|
|
|
static int viacam_enum_frameintervals(struct file *filp, void *priv,
|
|
struct v4l2_frmivalenum *interval)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
int ret;
|
|
|
|
mutex_lock(&cam->lock);
|
|
ret = sensor_call(cam, video, enum_frameintervals, interval);
|
|
mutex_unlock(&cam->lock);
|
|
return ret;
|
|
}
|
|
|
|
|
|
|
|
static const struct v4l2_ioctl_ops viacam_ioctl_ops = {
|
|
.vidioc_g_chip_ident = viacam_g_chip_ident,
|
|
.vidioc_enum_input = viacam_enum_input,
|
|
.vidioc_g_input = viacam_g_input,
|
|
.vidioc_s_input = viacam_s_input,
|
|
.vidioc_s_std = viacam_s_std,
|
|
.vidioc_enum_fmt_vid_cap = viacam_enum_fmt_vid_cap,
|
|
.vidioc_try_fmt_vid_cap = viacam_try_fmt_vid_cap,
|
|
.vidioc_g_fmt_vid_cap = viacam_g_fmt_vid_cap,
|
|
.vidioc_s_fmt_vid_cap = viacam_s_fmt_vid_cap,
|
|
.vidioc_querycap = viacam_querycap,
|
|
.vidioc_reqbufs = viacam_reqbufs,
|
|
.vidioc_querybuf = viacam_querybuf,
|
|
.vidioc_qbuf = viacam_qbuf,
|
|
.vidioc_dqbuf = viacam_dqbuf,
|
|
.vidioc_streamon = viacam_streamon,
|
|
.vidioc_streamoff = viacam_streamoff,
|
|
.vidioc_g_parm = viacam_g_parm,
|
|
.vidioc_s_parm = viacam_s_parm,
|
|
.vidioc_enum_framesizes = viacam_enum_framesizes,
|
|
.vidioc_enum_frameintervals = viacam_enum_frameintervals,
|
|
};
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Power management.
|
|
*/
|
|
#ifdef CONFIG_PM
|
|
|
|
static int viacam_suspend(void *priv)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
enum viacam_opstate state = cam->opstate;
|
|
|
|
if (cam->opstate != S_IDLE) {
|
|
viacam_stop_engine(cam);
|
|
cam->opstate = state; /* So resume restarts */
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int viacam_resume(void *priv)
|
|
{
|
|
struct via_camera *cam = priv;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Get back to a reasonable operating state.
|
|
*/
|
|
via_write_reg_mask(VIASR, 0x78, 0, 0x80);
|
|
via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0);
|
|
viacam_int_disable(cam);
|
|
set_bit(CF_CONFIG_NEEDED, &cam->flags);
|
|
/*
|
|
* Make sure the sensor's power state is correct
|
|
*/
|
|
if (cam->users > 0)
|
|
via_sensor_power_up(cam);
|
|
else
|
|
via_sensor_power_down(cam);
|
|
/*
|
|
* If it was operating, try to restart it.
|
|
*/
|
|
if (cam->opstate != S_IDLE) {
|
|
mutex_lock(&cam->lock);
|
|
ret = viacam_configure_sensor(cam);
|
|
if (!ret)
|
|
ret = viacam_config_controller(cam);
|
|
mutex_unlock(&cam->lock);
|
|
if (!ret)
|
|
viacam_start_engine(cam);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct viafb_pm_hooks viacam_pm_hooks = {
|
|
.suspend = viacam_suspend,
|
|
.resume = viacam_resume
|
|
};
|
|
|
|
#endif /* CONFIG_PM */
|
|
|
|
/*
|
|
* Setup stuff.
|
|
*/
|
|
|
|
static struct video_device viacam_v4l_template = {
|
|
.name = "via-camera",
|
|
.minor = -1,
|
|
.tvnorms = V4L2_STD_NTSC_M,
|
|
.current_norm = V4L2_STD_NTSC_M,
|
|
.fops = &viacam_fops,
|
|
.ioctl_ops = &viacam_ioctl_ops,
|
|
.release = video_device_release_empty, /* Check this */
|
|
};
|
|
|
|
/*
|
|
* The OLPC folks put the serial port on the same pin as
|
|
* the camera. They also get grumpy if we break the
|
|
* serial port and keep them from using it. So we have
|
|
* to check the serial enable bit and not step on it.
|
|
*/
|
|
#define VIACAM_SERIAL_DEVFN 0x88
|
|
#define VIACAM_SERIAL_CREG 0x46
|
|
#define VIACAM_SERIAL_BIT 0x40
|
|
|
|
static bool viacam_serial_is_enabled(void)
|
|
{
|
|
struct pci_bus *pbus = pci_find_bus(0, 0);
|
|
u8 cbyte;
|
|
|
|
if (!pbus)
|
|
return false;
|
|
pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN,
|
|
VIACAM_SERIAL_CREG, &cbyte);
|
|
if ((cbyte & VIACAM_SERIAL_BIT) == 0)
|
|
return false; /* Not enabled */
|
|
if (override_serial == 0) {
|
|
printk(KERN_NOTICE "Via camera: serial port is enabled, " \
|
|
"refusing to load.\n");
|
|
printk(KERN_NOTICE "Specify override_serial=1 to force " \
|
|
"module loading.\n");
|
|
return true;
|
|
}
|
|
printk(KERN_NOTICE "Via camera: overriding serial port\n");
|
|
pci_bus_write_config_byte(pbus, VIACAM_SERIAL_DEVFN,
|
|
VIACAM_SERIAL_CREG, cbyte & ~VIACAM_SERIAL_BIT);
|
|
return false;
|
|
}
|
|
|
|
static struct ov7670_config sensor_cfg = {
|
|
/* The XO-1.5 (only known user) clocks the camera at 90MHz. */
|
|
.clock_speed = 90,
|
|
};
|
|
|
|
static int viacam_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
struct i2c_adapter *sensor_adapter;
|
|
struct viafb_dev *viadev = pdev->dev.platform_data;
|
|
struct i2c_board_info ov7670_info = {
|
|
.type = "ov7670",
|
|
.addr = 0x42 >> 1,
|
|
.platform_data = &sensor_cfg,
|
|
};
|
|
|
|
/*
|
|
* Note that there are actually two capture channels on
|
|
* the device. We only deal with one for now. That
|
|
* is encoded here; nothing else assumes it's dealing with
|
|
* a unique capture device.
|
|
*/
|
|
struct via_camera *cam;
|
|
|
|
/*
|
|
* Ensure that frame buffer memory has been set aside for
|
|
* this purpose. As an arbitrary limit, refuse to work
|
|
* with less than two frames of VGA 16-bit data.
|
|
*
|
|
* If we ever support the second port, we'll need to set
|
|
* aside more memory.
|
|
*/
|
|
if (viadev->camera_fbmem_size < (VGA_HEIGHT*VGA_WIDTH*4)) {
|
|
printk(KERN_ERR "viacam: insufficient FB memory reserved\n");
|
|
return -ENOMEM;
|
|
}
|
|
if (viadev->engine_mmio == NULL) {
|
|
printk(KERN_ERR "viacam: No I/O memory, so no pictures\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (machine_is_olpc() && viacam_serial_is_enabled())
|
|
return -EBUSY;
|
|
|
|
/*
|
|
* Basic structure initialization.
|
|
*/
|
|
cam = kzalloc (sizeof(struct via_camera), GFP_KERNEL);
|
|
if (cam == NULL)
|
|
return -ENOMEM;
|
|
via_cam_info = cam;
|
|
cam->platdev = pdev;
|
|
cam->viadev = viadev;
|
|
cam->users = 0;
|
|
cam->owner = NULL;
|
|
cam->opstate = S_IDLE;
|
|
cam->user_format = cam->sensor_format = viacam_def_pix_format;
|
|
mutex_init(&cam->lock);
|
|
INIT_LIST_HEAD(&cam->buffer_queue);
|
|
cam->mmio = viadev->engine_mmio;
|
|
cam->fbmem = viadev->fbmem;
|
|
cam->fb_offset = viadev->camera_fbmem_offset;
|
|
cam->flags = 1 << CF_CONFIG_NEEDED;
|
|
cam->mbus_code = via_def_mbus_code;
|
|
/*
|
|
* Tell V4L that we exist.
|
|
*/
|
|
ret = v4l2_device_register(&pdev->dev, &cam->v4l2_dev);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Unable to register v4l2 device\n");
|
|
goto out_free;
|
|
}
|
|
ret = v4l2_ctrl_handler_init(&cam->ctrl_handler, 10);
|
|
if (ret)
|
|
goto out_unregister;
|
|
cam->v4l2_dev.ctrl_handler = &cam->ctrl_handler;
|
|
/*
|
|
* Convince the system that we can do DMA.
|
|
*/
|
|
pdev->dev.dma_mask = &viadev->pdev->dma_mask;
|
|
dma_set_mask(&pdev->dev, 0xffffffff);
|
|
/*
|
|
* Fire up the capture port. The write to 0x78 looks purely
|
|
* OLPCish; any system will need to tweak 0x1e.
|
|
*/
|
|
via_write_reg_mask(VIASR, 0x78, 0, 0x80);
|
|
via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0);
|
|
/*
|
|
* Get the sensor powered up.
|
|
*/
|
|
ret = via_sensor_power_setup(cam);
|
|
if (ret)
|
|
goto out_ctrl_hdl_free;
|
|
via_sensor_power_up(cam);
|
|
|
|
/*
|
|
* See if we can't find it on the bus. The VIA_PORT_31 assumption
|
|
* is OLPC-specific. 0x42 assumption is ov7670-specific.
|
|
*/
|
|
sensor_adapter = viafb_find_i2c_adapter(VIA_PORT_31);
|
|
cam->sensor = v4l2_i2c_new_subdev_board(&cam->v4l2_dev, sensor_adapter,
|
|
&ov7670_info, NULL);
|
|
if (cam->sensor == NULL) {
|
|
dev_err(&pdev->dev, "Unable to find the sensor!\n");
|
|
ret = -ENODEV;
|
|
goto out_power_down;
|
|
}
|
|
/*
|
|
* Get the IRQ.
|
|
*/
|
|
viacam_int_disable(cam);
|
|
ret = request_threaded_irq(viadev->pdev->irq, viacam_quick_irq,
|
|
viacam_irq, IRQF_SHARED, "via-camera", cam);
|
|
if (ret)
|
|
goto out_power_down;
|
|
/*
|
|
* Tell V4l2 that we exist.
|
|
*/
|
|
cam->vdev = viacam_v4l_template;
|
|
cam->vdev.v4l2_dev = &cam->v4l2_dev;
|
|
ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1);
|
|
if (ret)
|
|
goto out_irq;
|
|
video_set_drvdata(&cam->vdev, cam);
|
|
|
|
#ifdef CONFIG_PM
|
|
/*
|
|
* Hook into PM events
|
|
*/
|
|
viacam_pm_hooks.private = cam;
|
|
viafb_pm_register(&viacam_pm_hooks);
|
|
#endif
|
|
|
|
/* Power the sensor down until somebody opens the device */
|
|
via_sensor_power_down(cam);
|
|
return 0;
|
|
|
|
out_irq:
|
|
free_irq(viadev->pdev->irq, cam);
|
|
out_power_down:
|
|
via_sensor_power_release(cam);
|
|
out_ctrl_hdl_free:
|
|
v4l2_ctrl_handler_free(&cam->ctrl_handler);
|
|
out_unregister:
|
|
v4l2_device_unregister(&cam->v4l2_dev);
|
|
out_free:
|
|
kfree(cam);
|
|
return ret;
|
|
}
|
|
|
|
static int viacam_remove(struct platform_device *pdev)
|
|
{
|
|
struct via_camera *cam = via_cam_info;
|
|
struct viafb_dev *viadev = pdev->dev.platform_data;
|
|
|
|
video_unregister_device(&cam->vdev);
|
|
v4l2_device_unregister(&cam->v4l2_dev);
|
|
free_irq(viadev->pdev->irq, cam);
|
|
via_sensor_power_release(cam);
|
|
v4l2_ctrl_handler_free(&cam->ctrl_handler);
|
|
kfree(cam);
|
|
via_cam_info = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver viacam_driver = {
|
|
.driver = {
|
|
.name = "viafb-camera",
|
|
},
|
|
.probe = viacam_probe,
|
|
.remove = viacam_remove,
|
|
};
|
|
|
|
module_platform_driver(viacam_driver);
|