| /* |
| * 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/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/delay.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/pm_qos.h> |
| #include <linux/via-core.h> |
| #include <linux/via-gpio.h> |
| #include <linux/via_i2c.h> |
| #include <asm/olpc.h> |
| |
| #include "via-camera.h" |
| |
| MODULE_ALIAS("platform:viafb-camera"); |
| 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."); |
| |
| 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-enable the camera."); |
| |
| /* |
| * 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 }; |
| |
| 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; |
| struct pm_qos_request qos_request; |
| /* |
| * 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; |
| enum v4l2_mbus_pixelcode mbus_code; |
| }; |
| |
| /* |
| * Yes, this is a hack, but there's only going to be one of these |
| * on any system we know of. |
| */ |
| static struct via_camera *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); |
| |
| /* |
| * Format handling. This is ripped almost directly from Hans's changes |
| * to cafe_ccic.c. It's a little unfortunate; until this change, we |
| * didn't need to know anything about the format except its byte depth; |
| * now this information must be managed at this level too. |
| */ |
| static struct via_format { |
| __u8 *desc; |
| __u32 pixelformat; |
| int bpp; /* Bytes per pixel */ |
| enum v4l2_mbus_pixelcode mbus_code; |
| } via_formats[] = { |
| { |
| .desc = "YUYV 4:2:2", |
| .pixelformat = V4L2_PIX_FMT_YUYV, |
| .mbus_code = V4L2_MBUS_FMT_YUYV8_2X8, |
| .bpp = 2, |
| }, |
| /* RGB444 and Bayer should be doable, but have never been |
| tested with this driver. RGB565 seems to work at the default |
| resolution, but results in color corruption when being scaled by |
| viacam_set_scaled(), and is disabled as a result. */ |
| }; |
| #define N_VIA_FMTS ARRAY_SIZE(via_formats) |
| |
| static struct via_format *via_find_format(u32 pixelformat) |
| { |
| unsigned i; |
| |
| for (i = 0; i < N_VIA_FMTS; i++) |
| if (via_formats[i].pixelformat == pixelformat) |
| return via_formats + i; |
| /* Not found? Then return the first format. */ |
| return via_formats; |
| } |
| |
| |
| /*--------------------------------------------------------------------------*/ |
| /* |
| * 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_mbus_framefmt mbus_fmt; |
| int ret; |
| |
| v4l2_fill_mbus_format(&mbus_fmt, &cam->sensor_format, cam->mbus_code); |
| ret = sensor_call(cam, core, init, 0); |
| if (ret == 0) |
| ret = sensor_call(cam, video, s_mbus_fmt, &mbus_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|VCR_CI_CLKEN)); |
| /* |
| * Set up the controller for VGA resolution, modulo magic |
| * offsets from the via sample driver. |
| */ |
| 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); |
| } |
| |
| /* |
| * 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 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, upix, 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_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, |
| }; |
| |
| /*----------------------------------------------------------------------------*/ |
| |
| /* |
| * 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 __devinit 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 __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; |
| |
| /* |
| * 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"); |
| 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", 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); |
| |
| #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_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); |
| via_cam_info = NULL; |
| return 0; |
| } |
| |
| static struct platform_driver viacam_driver = { |
| .driver = { |
| .name = "viafb-camera", |
| }, |
| .probe = viacam_probe, |
| .remove = viacam_remove, |
| }; |
| |
| static int viacam_init(void) |
| { |
| return platform_driver_register(&viacam_driver); |
| } |
| module_init(viacam_init); |
| |
| static void viacam_exit(void) |
| { |
| platform_driver_unregister(&viacam_driver); |
| } |
| module_exit(viacam_exit); |