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SubjectRe: [PATCH 5/5] Add the viafb video capture driver
Hi Jon,

Jonathan Corbet wrote:
> Add a driver for the video capture port on VIA integrated chipsets. This
> version has a remaining OLPCism or two and expects to be talking to an
> ov7670; those can be improved as the need arises.
>
> This work was supported by the One Laptop Per Child project.
>
> Signed-off-by: Jonathan Corbet <corbet@lwn.net>

The driver is OK to my eyes. I just found 2 minor coding style issues.
it is ok to me if you want to sent it via your git tree.

Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>


PS.: sorry for not reviewing it earlier... I was a little busy during this
cycle, and I had some travels that delayed my tasks even further, causing
-ETOMANYPATCHES on my queue.

> ---
> drivers/media/video/Kconfig | 10 +
> drivers/media/video/Makefile | 2 +
> drivers/media/video/via-camera.c | 1368 ++++++++++++++++++++++++++++++++++++++
> drivers/media/video/via-camera.h | 93 +++
> drivers/video/via/accel.c | 2 +-
> drivers/video/via/via-core.c | 16 +-
> include/linux/via-core.h | 4 +-
> include/media/v4l2-chip-ident.h | 4 +
> 8 files changed, 1495 insertions(+), 4 deletions(-)
> create mode 100644 drivers/media/video/via-camera.c
> create mode 100644 drivers/media/video/via-camera.h
>
> diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
> index f8fc865..198636b 100644
> --- a/drivers/media/video/Kconfig
> +++ b/drivers/media/video/Kconfig
> @@ -833,6 +833,16 @@ config VIDEO_CAFE_CCIC
> CMOS camera controller. This is the controller found on first-
> generation OLPC systems.
>
> +config VIDEO_VIA_CAMERA
> + tristate "VIAFB camera controller support"
> + depends on FB_VIA
> + select VIDEOBUF_DMA_SG
> + select VIDEO_OV7670
> + help
> + Driver support for the integrated camera controller in VIA
> + Chrome9 chipsets. Currently only tested on OLPC xo-1.5 systems
> + with ov7670 sensors.
> +
> config SOC_CAMERA
> tristate "SoC camera support"
> depends on VIDEO_V4L2 && HAS_DMA && I2C
> diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
> index b88b617..089bb24 100644
> --- a/drivers/media/video/Makefile
> +++ b/drivers/media/video/Makefile
> @@ -123,6 +123,8 @@ obj-$(CONFIG_VIDEO_CX2341X) += cx2341x.o
>
> obj-$(CONFIG_VIDEO_CAFE_CCIC) += cafe_ccic.o
>
> +obj-$(CONFIG_VIDEO_VIA_CAMERA) += via-camera.o
> +
> obj-$(CONFIG_USB_DABUSB) += dabusb.o
> obj-$(CONFIG_USB_OV511) += ov511.o
> obj-$(CONFIG_USB_SE401) += se401.o
> diff --git a/drivers/media/video/via-camera.c b/drivers/media/video/via-camera.c
> new file mode 100644
> index 0000000..7b1ff0c
> --- /dev/null
> +++ b/drivers/media/video/via-camera.c
> @@ -0,0 +1,1368 @@
> +/*
> + * Driver for the VIA Chrome integrated camera controller.
> + *
> + * Copyright 2009,2010 Jonathan Corbet <corbet@lwn.net>
> + * Distributable under the terms of the GNU General Public License, version 2
> + *
> + * This work was supported by the One Laptop Per Child project
> + */
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/device.h>
> +#include <linux/list.h>
> +#include <linux/pci.h>
> +#include <linux/gpio.h>
> +#include <linux/interrupt.h>
> +#include <linux/pci.h>
> +#include <linux/platform_device.h>
> +#include <linux/videodev2.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-chip-ident.h>
> +#include <media/videobuf-dma-sg.h>
> +#include <linux/device.h>
> +#include <linux/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/pm_qos_params.h>
> +#include <linux/via-core.h>
> +#include <linux/via-gpio.h>
> +#include <linux/via_i2c.h>
> +
> +#include "via-camera.h"
> +
> +MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
> +MODULE_DESCRIPTION("VIA framebuffer-based camera controller driver");
> +MODULE_LICENSE("GPL");
> +
> +static int flip_image;
> +module_param(flip_image, bool, 0444);
> +MODULE_PARM_DESC(flip_image,
> + "If set, the sensor will be instructed to flip the image "
> + "vertically.");
> +
> +#ifdef CONFIG_OLPC_XO_1_5
> +static int override_serial;
> +module_param(override_serial, bool, 0444);
> +MODULE_PARM_DESC(override_serial,
> + "The camera driver will normally refuse to load if "
> + "the XO 1.5 serial port is enabled. Set this option "
> + "to force the issue.");
> +#endif
> +
> +/*
> + * Basic window sizes.
> + */
> +#define VGA_WIDTH 640
> +#define VGA_HEIGHT 480
> +#define QCIF_WIDTH 176
> +#define QCIF_HEIGHT 144
> +
> +/*
> + * The structure describing our camera.
> + */
> +enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 };
> +
> +static struct via_camera {
> + struct v4l2_device v4l2_dev;
> + struct video_device vdev;
> + struct v4l2_subdev *sensor;
> + struct platform_device *platdev;
> + struct viafb_dev *viadev;
> + struct mutex lock;
> + enum viacam_opstate opstate;
> + unsigned long flags;
> + /*
> + * GPIO info for power/reset management
> + */
> + int power_gpio;
> + int reset_gpio;
> + /*
> + * I/O memory stuff.
> + */
> + void __iomem *mmio; /* Where the registers live */
> + void __iomem *fbmem; /* Frame buffer memory */
> + u32 fb_offset; /* Reserved memory offset (FB) */
> + /*
> + * Capture buffers and related. The controller supports
> + * up to three, so that's what we have here. These buffers
> + * live in frame buffer memory, so we don't call them "DMA".
> + */
> + unsigned int cb_offsets[3]; /* offsets into fb mem */
> + u8 *cb_addrs[3]; /* Kernel-space addresses */
> + int n_cap_bufs; /* How many are we using? */
> + int next_buf;
> + struct videobuf_queue vb_queue;
> + struct list_head buffer_queue; /* prot. by reg_lock */
> + /*
> + * User tracking.
> + */
> + int users;
> + struct file *owner;
> + /*
> + * Video format information. sensor_format is kept in a form
> + * that we can use to pass to the sensor. We always run the
> + * sensor in VGA resolution, though, and let the controller
> + * downscale things if need be. So we keep the "real*
> + * dimensions separately.
> + */
> + struct v4l2_pix_format sensor_format;
> + struct v4l2_pix_format user_format;
> +} via_cam_info;
> +
> +/*
> + * Flag values, manipulated with bitops
> + */
> +#define CF_DMA_ACTIVE 0 /* A frame is incoming */
> +#define CF_CONFIG_NEEDED 1 /* Must configure hardware */
> +
> +
> +/*
> + * Nasty ugly v4l2 boilerplate.
> + */
> +#define sensor_call(cam, optype, func, args...) \
> + v4l2_subdev_call(cam->sensor, optype, func, ##args)
> +
> +/*
> + * Debugging and related.
> + */
> +#define cam_err(cam, fmt, arg...) \
> + dev_err(&(cam)->platdev->dev, fmt, ##arg);
> +#define cam_warn(cam, fmt, arg...) \
> + dev_warn(&(cam)->platdev->dev, fmt, ##arg);
> +#define cam_dbg(cam, fmt, arg...) \
> + dev_dbg(&(cam)->platdev->dev, fmt, ##arg);
> +
> +
> +/*--------------------------------------------------------------------------*/
> +/*
> + * Sensor power/reset management. This piece is OLPC-specific for
> + * sure; other configurations will have things connected differently.
> + */
> +static int via_sensor_power_setup(struct via_camera *cam)
> +{
> + int ret;
> +
> + cam->power_gpio = viafb_gpio_lookup("VGPIO3");
> + cam->reset_gpio = viafb_gpio_lookup("VGPIO2");
> + if (cam->power_gpio < 0 || cam->reset_gpio < 0) {
> + dev_err(&cam->platdev->dev, "Unable to find GPIO lines\n");
> + return -EINVAL;
> + }
> + ret = gpio_request(cam->power_gpio, "viafb-camera");
> + if (ret) {
> + dev_err(&cam->platdev->dev, "Unable to request power GPIO\n");
> + return ret;
> + }
> + ret = gpio_request(cam->reset_gpio, "viafb-camera");
> + if (ret) {
> + dev_err(&cam->platdev->dev, "Unable to request reset GPIO\n");
> + gpio_free(cam->power_gpio);
> + return ret;
> + }
> + gpio_direction_output(cam->power_gpio, 0);
> + gpio_direction_output(cam->reset_gpio, 0);
> + return 0;
> +}
> +
> +/*
> + * Power up the sensor and perform the reset dance.
> + */
> +static void via_sensor_power_up(struct via_camera *cam)
> +{
> + gpio_set_value(cam->power_gpio, 1);
> + gpio_set_value(cam->reset_gpio, 0);
> + msleep(20); /* Probably excessive */
> + gpio_set_value(cam->reset_gpio, 1);
> + msleep(20);
> +}
> +
> +static void via_sensor_power_down(struct via_camera *cam)
> +{
> + gpio_set_value(cam->power_gpio, 0);
> + gpio_set_value(cam->reset_gpio, 0);
> +}
> +
> +
> +static void via_sensor_power_release(struct via_camera *cam)
> +{
> + via_sensor_power_down(cam);
> + gpio_free(cam->power_gpio);
> + gpio_free(cam->reset_gpio);
> +}
> +
> +/* --------------------------------------------------------------------------*/
> +/* Sensor ops */
> +
> +/*
> + * Manage the ov7670 "flip" bit, which needs special help.
> + */
> +static int viacam_set_flip(struct via_camera *cam)
> +{
> + struct v4l2_control ctrl;
> +
> + memset(&ctrl, 0, sizeof(ctrl));
> + ctrl.id = V4L2_CID_VFLIP;
> + ctrl.value = flip_image;
> + return sensor_call(cam, core, s_ctrl, &ctrl);
> +}
> +
> +/*
> + * Configure the sensor. It's up to the caller to ensure
> + * that the camera is in the correct operating state.
> + */
> +static int viacam_configure_sensor(struct via_camera *cam)
> +{
> + struct v4l2_format fmt;
> + int ret;
> +
> + fmt.fmt.pix = cam->sensor_format;
> + ret = sensor_call(cam, core, init, 0);
> + if (ret == 0)
> + ret = sensor_call(cam, video, s_fmt, &fmt);
> + /*
> + * OV7670 does weird things if flip is set *before* format...
> + */
> + if (ret == 0)
> + ret = viacam_set_flip(cam);
> + return ret;
> +}
> +
> +
> +
> +/* --------------------------------------------------------------------------*/
> +/*
> + * Some simple register accessors; they assume that the lock is held.
> + *
> + * Should we want to support the second capture engine, we could
> + * hide the register difference by adding 0x1000 to registers in the
> + * 0x300-350 range.
> + */
> +static inline void viacam_write_reg(struct via_camera *cam,
> + int reg, int value)
> +{
> + iowrite32(value, cam->mmio + reg);
> +}
> +
> +static inline int viacam_read_reg(struct via_camera *cam, int reg)
> +{
> + return ioread32(cam->mmio + reg);
> +}
> +
> +static inline void viacam_write_reg_mask(struct via_camera *cam,
> + int reg, int value, int mask)
> +{
> + int tmp = viacam_read_reg(cam, reg);
> +
> + tmp = (tmp & ~mask) | (value & mask);
> + viacam_write_reg(cam, reg, tmp);
> +}
> +
> +
> +/* --------------------------------------------------------------------------*/
> +/* Interrupt management and handling */
> +
> +static irqreturn_t viacam_quick_irq(int irq, void *data)
> +{
> + struct via_camera *cam = data;
> + irqreturn_t ret = IRQ_NONE;
> + int icv;
> +
> + /*
> + * All we do here is to clear the interrupts and tell
> + * the handler thread to wake up.
> + */
> + spin_lock(&cam->viadev->reg_lock);
> + icv = viacam_read_reg(cam, VCR_INTCTRL);
> + if (icv & VCR_IC_EAV) {
> + icv |= VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL;
> + viacam_write_reg(cam, VCR_INTCTRL, icv);
> + ret = IRQ_WAKE_THREAD;
> + }
> + spin_unlock(&cam->viadev->reg_lock);
> + return ret;
> +}
> +
> +/*
> + * Find the next videobuf buffer which has somebody waiting on it.
> + */
> +static struct videobuf_buffer *viacam_next_buffer(struct via_camera *cam)
> +{
> + unsigned long flags;
> + struct videobuf_buffer *buf = NULL;
> +
> + spin_lock_irqsave(&cam->viadev->reg_lock, flags);
> + if (cam->opstate != S_RUNNING)
> + goto out;
> + if (list_empty(&cam->buffer_queue))
> + goto out;
> + buf = list_entry(cam->buffer_queue.next, struct videobuf_buffer, queue);
> + if (!waitqueue_active(&buf->done)) {/* Nobody waiting */
> + buf = NULL;
> + goto out;
> + }
> + list_del(&buf->queue);
> + buf->state = VIDEOBUF_ACTIVE;
> +out:
> + spin_unlock_irqrestore(&cam->viadev->reg_lock, flags);
> + return buf;
> +}
> +
> +/*
> + * The threaded IRQ handler.
> + */
> +static irqreturn_t viacam_irq(int irq, void *data)
> +{
> + int bufn;
> + struct videobuf_buffer *vb;
> + struct via_camera *cam = data;
> + struct videobuf_dmabuf *vdma;
> +
> + /*
> + * If there is no place to put the data frame, don't bother
> + * with anything else.
> + */
> + vb = viacam_next_buffer(cam);
> + if (vb == NULL)
> + goto done;
> + /*
> + * Figure out which buffer we just completed.
> + */
> + bufn = (viacam_read_reg(cam, VCR_INTCTRL) & VCR_IC_ACTBUF) >> 3;
> + bufn -= 1;
> + if (bufn < 0)
> + bufn = cam->n_cap_bufs - 1;
> + /*
> + * Copy over the data and let any waiters know.
> + */
> + vdma = videobuf_to_dma(vb);
> + viafb_dma_copy_out_sg(cam->cb_offsets[bufn], vdma->sglist, vdma->sglen);
> + vb->state = VIDEOBUF_DONE;
> + vb->size = cam->user_format.sizeimage;
> + wake_up(&vb->done);
> +done:
> + return IRQ_HANDLED;
> +}
> +
> +
> +/*
> + * These functions must mess around with the general interrupt
> + * control register, which is relevant to much more than just the
> + * camera. Nothing else uses interrupts, though, as of this writing.
> + * Should that situation change, we'll have to improve support at
> + * the via-core level.
> + */
> +static void viacam_int_enable(struct via_camera *cam)
> +{
> + viacam_write_reg(cam, VCR_INTCTRL,
> + VCR_IC_INTEN|VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL);
> + viafb_irq_enable(VDE_I_C0AVEN);
> +}
> +
> +static void viacam_int_disable(struct via_camera *cam)
> +{
> + viafb_irq_disable(VDE_I_C0AVEN);
> + viacam_write_reg(cam, VCR_INTCTRL, 0);
> +}
> +
> +
> +
> +/* --------------------------------------------------------------------------*/
> +/* Controller operations */
> +
> +/*
> + * Set up our capture buffers in framebuffer memory.
> + */
> +static int viacam_ctlr_cbufs(struct via_camera *cam)
> +{
> + int nbuf = cam->viadev->camera_fbmem_size/cam->sensor_format.sizeimage;
> + int i;
> + unsigned int offset;
> +
> + /*
> + * See how many buffers we can work with.
> + */
> + if (nbuf >= 3) {
> + cam->n_cap_bufs = 3;
> + viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_3BUFS,
> + VCR_CI_3BUFS);
> + } else if (nbuf == 2) {
> + cam->n_cap_bufs = 2;
> + viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_3BUFS);
> + } else {
> + cam_warn(cam, "Insufficient frame buffer memory\n");
> + return -ENOMEM;
> + }
> + /*
> + * Set them up.
> + */
> + offset = cam->fb_offset;
> + for (i = 0; i < cam->n_cap_bufs; i++) {
> + cam->cb_offsets[i] = offset;
> + cam->cb_addrs[i] = cam->fbmem + offset;
> + viacam_write_reg(cam, VCR_VBUF1 + i*4, offset & VCR_VBUF_MASK);
> + offset += cam->sensor_format.sizeimage;
> + }
> + return 0;
> +}
> +
> +/*
> + * Set the scaling register for downscaling the image.
> + *
> + * This register works like this... Vertical scaling is enabled
> + * by bit 26; if that bit is set, downscaling is controlled by the
> + * value in bits 16:25. Those bits are divided by 1024 to get
> + * the scaling factor; setting just bit 25 thus cuts the height
> + * in half.
> + *
> + * Horizontal scaling works about the same, but it's enabled by
> + * bit 11, with bits 0:10 giving the numerator of a fraction
> + * (over 2048) for the scaling value.
> + *
> + * This function is naive in that, if the user departs from
> + * the 3x4 VGA scaling factor, the image will distort. We
> + * could work around that if it really seemed important.
> + */
> +static void viacam_set_scale(struct via_camera *cam)
> +{
> + unsigned int avscale;
> + int sf;
> +
> + if (cam->user_format.width == VGA_WIDTH)
> + avscale = 0;
> + else {
> + sf = (cam->user_format.width*2048)/VGA_WIDTH;
> + avscale = VCR_AVS_HEN | sf;
> + }
> + if (cam->user_format.height < VGA_HEIGHT) {
> + sf = (1024*cam->user_format.height)/VGA_HEIGHT;
> + avscale |= VCR_AVS_VEN | (sf << 16);
> + }
> + viacam_write_reg(cam, VCR_AVSCALE, avscale);
> +}
> +
> +
> +/*
> + * Configure image-related information into the capture engine.
> + */
> +static void viacam_ctlr_image(struct via_camera *cam)
> +{
> + int cicreg;
> +
> + /*
> + * Disable clock before messing with stuff - from the via
> + * sample driver.
> + */
> + viacam_write_reg(cam, VCR_CAPINTC, ~VCR_CI_ENABLE);
> + viacam_write_reg(cam, VCR_CAPINTC, ~(VCR_CI_ENABLE|VCR_CI_CLKEN));
> + /*
> + * Disable a bunch of stuff.
> + */
> + 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)
> +{
> + videobuf_dma_unmap(q, 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);
> + }
> + (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);
> + 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,
> + .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);
> +}
> +
> +/*
> + * Control ops are passed through to the sensor.
> + */
> +static int viacam_queryctrl(struct file *filp, void *priv,
> + struct v4l2_queryctrl *qc)
> +{
> + struct via_camera *cam = priv;
> + int ret;
> +
> + mutex_lock(&cam->lock);
> + ret = sensor_call(cam, core, queryctrl, qc);
> + mutex_unlock(&cam->lock);
> + return ret;
> +}
> +
> +
> +static int viacam_g_ctrl(struct file *filp, void *priv,
> + struct v4l2_control *ctrl)
> +{
> + struct via_camera *cam = priv;
> + int ret;
> +
> + mutex_lock(&cam->lock);
> + ret = sensor_call(cam, core, g_ctrl, ctrl);
> + mutex_unlock(&cam->lock);
> + return ret;
> +}
> +
> +
> +static int viacam_s_ctrl(struct file *filp, void *priv,
> + struct v4l2_control *ctrl)
> +{
> + struct via_camera *cam = priv;
> + int ret;
> +
> + mutex_lock(&cam->lock);
> + ret = sensor_call(cam, core, s_ctrl, ctrl);
> + mutex_unlock(&cam->lock);
> + return ret;
> +}
> +
> +/*
> + * 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 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,

CodingStyle: please use spaces between values/operators. Not sure why, but
newer versions of checkpatch.pl don't complain anymore on some cases.

> +};
> +
> +static int viacam_enum_fmt_vid_cap(struct file *filp, void *priv,
> + struct v4l2_fmtdesc *fmt)
> +{
> + struct via_camera *cam = priv;
> + int ret;
> +
> + mutex_lock(&cam->lock);
> + ret = sensor_call(cam, video, enum_fmt, fmt);
> + mutex_unlock(&cam->lock);
> + return ret;
> +}
> +
> +/*
> + * 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)
> +{
> + userfmt->pixelformat = sensorfmt->pixelformat;
> + userfmt->field = sensorfmt->field;
> + userfmt->bytesperline = 2*userfmt->width;

CodingStyle: please use spaces between values/operators. Not sure why, but
newer versions of checkpatch.pl don't complain anymore on some cases.

> + userfmt->sizeimage = userfmt->bytesperline*userfmt->height;
> +}
> +
> +static int viacam_try_fmt_vid_cap(struct file *filp, void *priv,
> + struct v4l2_format *fmt)
> +{
> + struct via_camera *cam = priv;
> + int ret;
> + struct v4l2_format sfmt;
> +
> + viacam_fmt_pre(&fmt->fmt.pix, &sfmt.fmt.pix);
> + mutex_lock(&cam->lock);
> + ret = sensor_call(cam, video, try_fmt, &sfmt);
> + mutex_unlock(&cam->lock);
> + viacam_fmt_post(&fmt->fmt.pix, &sfmt.fmt.pix);
> + return ret;
> +}
> +
> +static int viacam_g_fmt_vid_cap(struct file *filp, void *priv,
> + struct v4l2_format *fmt)
> +{
> + struct via_camera *cam = priv;
> +
> + fmt->fmt.pix = cam->user_format;
> + 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;
> +
> + /*
> + * Camera must be idle or we can't mess with the
> + * video setup.
> + */
> + if (cam->opstate != S_IDLE)
> + return -EBUSY;
> + /*
> + * Let the sensor code look over and tweak the
> + * requested formatting.
> + */
> + mutex_lock(&cam->lock);
> + viacam_fmt_pre(&fmt->fmt.pix, &sfmt.fmt.pix);
> + ret = sensor_call(cam, video, try_fmt, &sfmt);
> + if (ret)
> + goto out;
> + viacam_fmt_post(&fmt->fmt.pix, &sfmt.fmt.pix);
> + /*
> + * OK, let's commit to the new format.
> + */
> + cam->user_format = fmt->fmt.pix;
> + cam->sensor_format = sfmt.fmt.pix;
> + 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;
> + if (cam->opstate != S_IDLE)
> + return -EBUSY;
> + /*
> + * Enforce the V4l2 "only one owner gets to read data" rule.
> + */

This is not really a V4L2 rule, but a hardware limitation. On most devices,
only one stream can be produced.

> + if (cam->owner && cam->owner != filp)
> + return -EBUSY;
> + cam->owner = filp;
> + /*
> + * Configure things if need be.
> + */
> + if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) {
> + mutex_lock(&cam->lock);
> + ret = viacam_configure_sensor(cam);
> + if (!ret)
> + ret = viacam_config_controller(cam);
> + mutex_unlock(&cam->lock);
> + }
> + /*
> + * 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_requirement(PM_QOS_CPU_DMA_LATENCY, "viafb-dma", 50);
> + /*
> + * Fire things up.
> + */
> + if (!ret) {
> + INIT_LIST_HEAD(&cam->buffer_queue);
> + ret = videobuf_streamon(&cam->vb_queue);
> + if (!ret)
> + viacam_start_engine(cam);
> + }
> + 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;
> + pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY, "viafb-dma");
> + 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);
> + return ret;
> +}
> +
> +#ifdef CONFIG_VIDEO_V4L1_COMPAT
> +static int viacam_vidiocgmbuf(struct file *filp, void *priv,
> + struct video_mbuf *mbuf)
> +{
> + struct via_camera *cam = priv;
> +
> + return videobuf_cgmbuf(&cam->vb_queue, mbuf, 6);
> +}
> +#endif
> +
> +/* 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_queryctrl = viacam_queryctrl,
> + .vidioc_g_ctrl = viacam_g_ctrl,
> + .vidioc_s_ctrl = viacam_s_ctrl,
> + .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,
> +#ifdef CONFIG_VIDEO_V4L1_COMPAT
> + .vidiocgmbuf = viacam_vidiocgmbuf,
> +#endif
> +};
> +
> +/*----------------------------------------------------------------------------*/
> +
> +/*
> + * Power management.
> + */
> +
> +/*
> + * 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 */
> +};
> +
> +
> +static __devinit int viacam_probe(struct platform_device *pdev)
> +{
> + int ret;
> + struct i2c_adapter *sensor_adapter;
> + struct viafb_dev *viadev = pdev->dev.platform_data;
> +
> + /*
> + * 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 = &via_cam_info;
> +
> + /*
> + * 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;
> + }
> + /*
> + * Basic structure initialization.
> + */
> + 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;
> + /*
> + * 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");
> + return ret;
> + }
> + /*
> + * 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_unregister;
> + 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(&cam->v4l2_dev, sensor_adapter,
> + "ov7670", "ov7670", 0x42 >> 1, 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);
> +
> + /* 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_unregister:
> + v4l2_device_unregister(&cam->v4l2_dev);
> + return ret;
> +}
> +
> +static __devexit 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);
> + return 0;
> +}
> +
> +
> +static struct platform_driver viacam_driver = {
> + .driver = {
> + .name = "viafb-camera",
> + },
> + .probe = viacam_probe,
> + .remove = viacam_remove,
> +};
> +
> +
> +#ifdef CONFIG_OLPC_XO_1_5
> +/*
> + * 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 __devinit int viacam_check_serial_port(void)
> +{
> + struct pci_bus *pbus = pci_find_bus(0, 0);
> + u8 cbyte;
> +
> + pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN,
> + VIACAM_SERIAL_CREG, &cbyte);
> + if ((cbyte & VIACAM_SERIAL_BIT) == 0)
> + return 0; /* 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 -EBUSY;
> + }
> + 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 0;
> +}
> +#endif
> +
> +
> +
> +
> +static int viacam_init(void)
> +{
> +#ifdef CONFIG_OLPC_XO_1_5
> + if (viacam_check_serial_port())
> + return -EBUSY;
> +#endif
> + return platform_driver_register(&viacam_driver);
> +}
> +module_init(viacam_init);
> +
> +static void viacam_exit(void)
> +{
> + platform_driver_unregister(&viacam_driver);
> +}
> +module_exit(viacam_exit);
> diff --git a/drivers/media/video/via-camera.h b/drivers/media/video/via-camera.h
> new file mode 100644
> index 0000000..b12a4b3
> --- /dev/null
> +++ b/drivers/media/video/via-camera.h
> @@ -0,0 +1,93 @@
> +/*
> + * VIA Camera register definitions.
> + */
> +#define VCR_INTCTRL 0x300 /* Capture interrupt control */
> +#define VCR_IC_EAV 0x0001 /* End of active video status */
> +#define VCR_IC_EVBI 0x0002 /* End of VBI status */
> +#define VCR_IC_FBOTFLD 0x0004 /* "flipping" Bottom field is active */
> +#define VCR_IC_ACTBUF 0x0018 /* Active video buffer */
> +#define VCR_IC_VSYNC 0x0020 /* 0 = VB, 1 = active video */
> +#define VCR_IC_BOTFLD 0x0040 /* Bottom field is active */
> +#define VCR_IC_FFULL 0x0080 /* FIFO full */
> +#define VCR_IC_INTEN 0x0100 /* End of active video int. enable */
> +#define VCR_IC_VBIINT 0x0200 /* End of VBI int enable */
> +#define VCR_IC_VBIBUF 0x0400 /* Current VBI buffer */
> +
> +#define VCR_TSC 0x308 /* Transport stream control */
> +#define VCR_TSC_ENABLE 0x000001 /* Transport stream input enable */
> +#define VCR_TSC_DROPERR 0x000002 /* Drop error packets */
> +#define VCR_TSC_METHOD 0x00000c /* DMA method (non-functional) */
> +#define VCR_TSC_COUNT 0x07fff0 /* KByte or packet count */
> +#define VCR_TSC_CBMODE 0x080000 /* Change buffer by byte count */
> +#define VCR_TSC_PSSIG 0x100000 /* Packet starting signal disable */
> +#define VCR_TSC_BE 0x200000 /* MSB first (serial mode) */
> +#define VCR_TSC_SERIAL 0x400000 /* Serial input (0 = parallel) */
> +
> +#define VCR_CAPINTC 0x310 /* Capture interface control */
> +#define VCR_CI_ENABLE 0x00000001 /* Capture enable */
> +#define VCR_CI_BSS 0x00000002 /* WTF "bit stream selection" */
> +#define VCR_CI_3BUFS 0x00000004 /* 1 = 3 buffers, 0 = 2 buffers */
> +#define VCR_CI_VIPEN 0x00000008 /* VIP enable */
> +#define VCR_CI_CCIR601_8 0 /* CCIR601 input stream, 8 bit */
> +#define VCR_CI_CCIR656_8 0x00000010 /* ... CCIR656, 8 bit */
> +#define VCR_CI_CCIR601_16 0x00000020 /* ... CCIR601, 16 bit */
> +#define VCR_CI_CCIR656_16 0x00000030 /* ... CCIR656, 16 bit */
> +#define VCR_CI_HDMODE 0x00000040 /* CCIR656-16 hdr decode mode; 1=16b */
> +#define VCR_CI_BSWAP 0x00000080 /* Swap bytes (16-bit) */
> +#define VCR_CI_YUYV 0 /* Byte order 0123 */
> +#define VCR_CI_UYVY 0x00000100 /* Byte order 1032 */
> +#define VCR_CI_YVYU 0x00000200 /* Byte order 0321 */
> +#define VCR_CI_VYUY 0x00000300 /* Byte order 3012 */
> +#define VCR_CI_VIPTYPE 0x00000400 /* VIP type */
> +#define VCR_CI_IFSEN 0x00000800 /* Input field signal enable */
> +#define VCR_CI_DIODD 0 /* De-interlace odd, 30fps */
> +#define VCR_CI_DIEVEN 0x00001000 /* ...even field, 30fps */
> +#define VCR_CI_DIBOTH 0x00002000 /* ...both fields, 60fps */
> +#define VCR_CI_DIBOTH30 0x00003000 /* ...both fields, 30fps interlace */
> +#define VCR_CI_CONVTYPE 0x00004000 /* 4:2:2 to 4:4:4; 1 = interpolate */
> +#define VCR_CI_CFC 0x00008000 /* Capture flipping control */
> +#define VCR_CI_FILTER 0x00070000 /* Horiz filter mode select
> + 000 = none
> + 001 = 2 tap
> + 010 = 3 tap
> + 011 = 4 tap
> + 100 = 5 tap */
> +#define VCR_CI_CLKINV 0x00080000 /* Input CLK inverted */
> +#define VCR_CI_VREFINV 0x00100000 /* VREF inverted */
> +#define VCR_CI_HREFINV 0x00200000 /* HREF inverted */
> +#define VCR_CI_FLDINV 0x00400000 /* Field inverted */
> +#define VCR_CI_CLKPIN 0x00800000 /* Capture clock pin */
> +#define VCR_CI_THRESH 0x0f000000 /* Capture fifo threshold */
> +#define VCR_CI_HRLE 0x10000000 /* Positive edge of HREF */
> +#define VCR_CI_VRLE 0x20000000 /* Positive edge of VREF */
> +#define VCR_CI_OFLDINV 0x40000000 /* Field output inverted */
> +#define VCR_CI_CLKEN 0x80000000 /* Capture clock enable */
> +
> +#define VCR_HORRANGE 0x314 /* Active video horizontal range */
> +#define VCR_VERTRANGE 0x318 /* Active video vertical range */
> +#define VCR_AVSCALE 0x31c /* Active video scaling control */
> +#define VCR_AVS_HEN 0x00000800 /* Horizontal scale enable */
> +#define VCR_AVS_VEN 0x04000000 /* Vertical enable */
> +#define VCR_VBIHOR 0x320 /* VBI Data horizontal range */
> +#define VCR_VBIVERT 0x324 /* VBI data vertical range */
> +#define VCR_VBIBUF1 0x328 /* First VBI buffer */
> +#define VCR_VBISTRIDE 0x32c /* VBI stride */
> +#define VCR_ANCDATACNT 0x330 /* Ancillary data count setting */
> +#define VCR_MAXDATA 0x334 /* Active data count of active video */
> +#define VCR_MAXVBI 0x338 /* Maximum data count of VBI */
> +#define VCR_CAPDATA 0x33c /* Capture data count */
> +#define VCR_VBUF1 0x340 /* First video buffer */
> +#define VCR_VBUF2 0x344 /* Second video buffer */
> +#define VCR_VBUF3 0x348 /* Third video buffer */
> +#define VCR_VBUF_MASK 0x1ffffff0 /* Bits 28:4 */
> +#define VCR_VBIBUF2 0x34c /* Second VBI buffer */
> +#define VCR_VSTRIDE 0x350 /* Stride of video + coring control */
> +#define VCR_VS_STRIDE_SHIFT 4
> +#define VCR_VS_STRIDE 0x00001ff0 /* Stride (8-byte units) */
> +#define VCR_VS_CCD 0x007f0000 /* Coring compare data */
> +#define VCR_VS_COREEN 0x00800000 /* Coring enable */
> +#define VCR_TS0ERR 0x354 /* TS buffer 0 error indicator */
> +#define VCR_TS1ERR 0x358 /* TS buffer 0 error indicator */
> +#define VCR_TS2ERR 0x35c /* TS buffer 0 error indicator */
> +
> +/* Add 0x1000 for the second capture engine registers */
> diff --git a/drivers/video/via/accel.c b/drivers/video/via/accel.c
> index e44893e..04bec05 100644
> --- a/drivers/video/via/accel.c
> +++ b/drivers/video/via/accel.c
> @@ -370,7 +370,7 @@ int viafb_init_engine(struct fb_info *info)
> viapar->shared->vq_vram_addr = viapar->fbmem_free;
> viapar->fbmem_used += VQ_SIZE;
>
> -#if defined(CONFIG_FB_VIA_CAMERA) || defined(CONFIG_FB_VIA_CAMERA_MODULE)
> +#if defined(CONFIG_VIDEO_VIA_CAMERA) || defined(CONFIG_VIDEO_VIA_CAMERA_MODULE)
> /*
> * Set aside a chunk of framebuffer memory for the camera
> * driver. Someday this driver probably needs a proper allocator
> diff --git a/drivers/video/via/via-core.c b/drivers/video/via/via-core.c
> index 15fcaab..ce13fc9 100644
> --- a/drivers/video/via/via-core.c
> +++ b/drivers/video/via/via-core.c
> @@ -95,6 +95,13 @@ EXPORT_SYMBOL_GPL(viafb_irq_disable);
>
> /* ---------------------------------------------------------------------- */
> /*
> + * Currently, the camera driver is the only user of the DMA code, so we
> + * only compile it in if the camera driver is being built. Chances are,
> + * most viafb systems will not need to have this extra code for a while.
> + * As soon as another user comes long, the ifdef can be removed.
> + */
> +#if defined(CONFIG_VIDEO_VIA_CAMERA) || defined(CONFIG_VIDEO_VIA_CAMERA_MODULE)
> +/*
> * Access to the DMA engine. This currently provides what the camera
> * driver needs (i.e. outgoing only) but is easily expandable if need
> * be.
> @@ -322,7 +329,7 @@ int viafb_dma_copy_out_sg(unsigned int offset, struct scatterlist *sg, int nsg)
> return 0;
> }
> EXPORT_SYMBOL_GPL(viafb_dma_copy_out_sg);
> -
> +#endif /* CONFIG_VIDEO_VIA_CAMERA */
>
> /* ---------------------------------------------------------------------- */
> /*
> @@ -507,7 +514,12 @@ static struct viafb_subdev_info {
> },
> {
> .name = "viafb-i2c",
> - }
> + },
> +#if defined(CONFIG_VIDEO_VIA_CAMERA) || defined(CONFIG_VIDEO_VIA_CAMERA_MODULE)
> + {
> + .name = "viafb-camera",
> + },
> +#endif
> };
> #define N_SUBDEVS ARRAY_SIZE(viafb_subdevs)
>
> diff --git a/include/linux/via-core.h b/include/linux/via-core.h
> index 7ffb521..38bffd8 100644
> --- a/include/linux/via-core.h
> +++ b/include/linux/via-core.h
> @@ -81,7 +81,7 @@ struct viafb_dev {
> unsigned long fbmem_start;
> long fbmem_len;
> void __iomem *fbmem;
> -#if defined(CONFIG_FB_VIA_CAMERA) || defined(CONFIG_FB_VIA_CAMERA_MODULE)
> +#if defined(CONFIG_VIDEO_VIA_CAMERA) || defined(CONFIG_VIDEO_VIA_CAMERA_MODULE)
> long camera_fbmem_offset;
> long camera_fbmem_size;
> #endif
> @@ -138,6 +138,7 @@ void viafb_irq_disable(u32 mask);
> #define VDE_I_LVDSSIEN 0x40000000 /* LVDS Sense enable */
> #define VDE_I_ENABLE 0x80000000 /* Global interrupt enable */
>
> +#if defined(CONFIG_VIDEO_VIA_CAMERA) || defined(CONFIG_VIDEO_VIA_CAMERA_MODULE)
> /*
> * DMA management.
> */
> @@ -172,6 +173,7 @@ int viafb_dma_copy_out_sg(unsigned int offset, struct scatterlist *sg, int nsg);
> */
> #define VGA_WIDTH 640
> #define VGA_HEIGHT 480
> +#endif /* CONFIG_VIDEO_VIA_CAMERA */
>
> /*
> * Indexed port operations. Note that these are all multi-op
> diff --git a/include/media/v4l2-chip-ident.h b/include/media/v4l2-chip-ident.h
> index 56abf21..d1c4bd3 100644
> --- a/include/media/v4l2-chip-ident.h
> +++ b/include/media/v4l2-chip-ident.h
> @@ -107,6 +107,10 @@ enum {
> V4L2_IDENT_VPX3216B = 3216,
> V4L2_IDENT_VPX3220A = 3220,
>
> + /* VX855 just ident 3409 */
> + /* Other via devs could use 3314, 3324, 3327, 3336, 3364, 3353 */
> + V4L2_IDENT_VIA_VX855 = 3409,
> +
> /* module tvp5150 */
> V4L2_IDENT_TVP5150 = 5150,
>


--

Cheers,
Mauro


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