diff options
Diffstat (limited to 'drivers/media/video/via-camera.c')
| -rw-r--r-- | drivers/media/video/via-camera.c | 1514 |
1 files changed, 0 insertions, 1514 deletions
diff --git a/drivers/media/video/via-camera.c b/drivers/media/video/via-camera.c deleted file mode 100644 index eb404c2ce27..00000000000 --- a/drivers/media/video/via-camera.c +++ /dev/null @@ -1,1514 +0,0 @@ -/* - * 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/ov7670.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 bool 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 bool 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, spix, f->mbus_code); - ret = sensor_call(cam, video, try_mbus_fmt, &mbus_fmt); - v4l2_fill_pix_format(spix, &mbus_fmt); - viacam_fmt_post(upix, spix); - return ret; -} - - - -static int viacam_try_fmt_vid_cap(struct file *filp, void *priv, - struct v4l2_format *fmt) -{ - struct via_camera *cam = priv; - struct v4l2_format sfmt; - int ret; - - mutex_lock(&cam->lock); - ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix); - mutex_unlock(&cam->lock); - return ret; -} - - -static int viacam_g_fmt_vid_cap(struct file *filp, void *priv, - struct v4l2_format *fmt) -{ - struct via_camera *cam = priv; - - mutex_lock(&cam->lock); - fmt->fmt.pix = cam->user_format; - mutex_unlock(&cam->lock); - return 0; -} - -static int viacam_s_fmt_vid_cap(struct file *filp, void *priv, - struct v4l2_format *fmt) -{ - struct via_camera *cam = priv; - int ret; - struct v4l2_format sfmt; - struct via_format *f = via_find_format(fmt->fmt.pix.pixelformat); - - /* - * Camera must be idle or we can't mess with the - * video setup. - */ - mutex_lock(&cam->lock); - if (cam->opstate != S_IDLE) { - ret = -EBUSY; - goto out; - } - /* - * Let the sensor code look over and tweak the - * requested formatting. - */ - ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix); - if (ret) - goto out; - /* - * OK, let's commit to the new format. - */ - cam->user_format = fmt->fmt.pix; - cam->sensor_format = sfmt.fmt.pix; - cam->mbus_code = f->mbus_code; - ret = viacam_configure_sensor(cam); - if (!ret) - ret = viacam_config_controller(cam); -out: - mutex_unlock(&cam->lock); - return ret; -} - -static int viacam_querycap(struct file *filp, void *priv, - struct v4l2_capability *cap) -{ - strcpy(cap->driver, "via-camera"); - strcpy(cap->card, "via-camera"); - cap->version = 1; - cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | - V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; - return 0; -} - -/* - * Streaming operations - pure videobuf stuff. - */ -static int viacam_reqbufs(struct file *filp, void *priv, - struct v4l2_requestbuffers *rb) -{ - struct via_camera *cam = priv; - - return videobuf_reqbufs(&cam->vb_queue, rb); -} - -static int viacam_querybuf(struct file *filp, void *priv, - struct v4l2_buffer *buf) -{ - struct via_camera *cam = priv; - - return videobuf_querybuf(&cam->vb_queue, buf); -} - -static int viacam_qbuf(struct file *filp, void *priv, struct v4l2_buffer *buf) -{ - struct via_camera *cam = priv; - - return videobuf_qbuf(&cam->vb_queue, buf); -} - -static int viacam_dqbuf(struct file *filp, void *priv, struct v4l2_buffer *buf) -{ - struct via_camera *cam = priv; - - return videobuf_dqbuf(&cam->vb_queue, buf, filp->f_flags & O_NONBLOCK); -} - -static int viacam_streamon(struct file *filp, void *priv, enum v4l2_buf_type t) -{ - struct via_camera *cam = priv; - int ret = 0; - - if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE) - return -EINVAL; - - mutex_lock(&cam->lock); - if (cam->opstate != S_IDLE) { - ret = -EBUSY; - goto out; - } - /* - * Enforce the V4l2 "only one owner gets to read data" rule. - */ - if (cam->owner && cam->owner != filp) { - ret = -EBUSY; - goto out; - } - cam->owner = filp; - /* - * Configure things if need be. - */ - if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) { - ret = viacam_configure_sensor(cam); - if (ret) - goto out; - ret = viacam_config_controller(cam); - if (ret) - goto out; - } - /* - * If the CPU goes into C3, the DMA transfer gets corrupted and - * users start filing unsightly bug reports. Put in a "latency" - * requirement which will keep the CPU out of the deeper sleep - * states. - */ - pm_qos_add_request(&cam->qos_request, PM_QOS_CPU_DMA_LATENCY, 50); - /* - * Fire things up. - */ - INIT_LIST_HEAD(&cam->buffer_queue); - ret = videobuf_streamon(&cam->vb_queue); - if (!ret) - viacam_start_engine(cam); -out: - mutex_unlock(&cam->lock); - return ret; -} - -static int viacam_streamoff(struct file *filp, void *priv, enum v4l2_buf_type t) -{ - struct via_camera *cam = priv; - int ret; - - if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE) - return -EINVAL; - mutex_lock(&cam->lock); - if (cam->opstate != S_RUNNING) { - ret = -EINVAL; - goto out; - } - pm_qos_remove_request(&cam->qos_request); - viacam_stop_engine(cam); - /* - * Videobuf will recycle all of the outstanding buffers, but - * we should be sure we don't retain any references to - * any of them. - */ - ret = videobuf_streamoff(&cam->vb_queue); - INIT_LIST_HEAD(&cam->buffer_queue); -out: - mutex_unlock(&cam->lock); - return ret; -} - -/* G/S_PARM */ - -static int viacam_g_parm(struct file *filp, void *priv, - struct v4l2_streamparm *parm) -{ - struct via_camera *cam = priv; - int ret; - - mutex_lock(&cam->lock); - ret = sensor_call(cam, video, g_parm, parm); - mutex_unlock(&cam->lock); - parm->parm.capture.readbuffers = cam->n_cap_bufs; - return ret; -} - -static int viacam_s_parm(struct file *filp, void *priv, - struct v4l2_streamparm *parm) -{ - struct via_camera *cam = priv; - int ret; - - mutex_lock(&cam->lock); - ret = sensor_call(cam, video, s_parm, parm); - mutex_unlock(&cam->lock); - parm->parm.capture.readbuffers = cam->n_cap_bufs; - return ret; -} - -static int viacam_enum_framesizes(struct file *filp, void *priv, - struct v4l2_frmsizeenum *sizes) -{ - if (sizes->index != 0) - return -EINVAL; - sizes->type = V4L2_FRMSIZE_TYPE_CONTINUOUS; - sizes->stepwise.min_width = QCIF_WIDTH; - sizes->stepwise.min_height = QCIF_HEIGHT; - sizes->stepwise.max_width = VGA_WIDTH; - sizes->stepwise.max_height = VGA_HEIGHT; - sizes->stepwise.step_width = sizes->stepwise.step_height = 1; - return 0; -} - -static int viacam_enum_frameintervals(struct file *filp, void *priv, - struct v4l2_frmivalenum *interval) -{ - struct via_camera *cam = priv; - int ret; - - mutex_lock(&cam->lock); - ret = sensor_call(cam, video, enum_frameintervals, interval); - mutex_unlock(&cam->lock); - return ret; -} - - - -static const struct v4l2_ioctl_ops viacam_ioctl_ops = { - .vidioc_g_chip_ident = viacam_g_chip_ident, - .vidioc_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 struct ov7670_config sensor_cfg = { - /* The XO-1.5 (only known user) clocks the camera at 90MHz. */ - .clock_speed = 90, -}; - -static __devinit int viacam_probe(struct platform_device *pdev) -{ - int ret; - struct i2c_adapter *sensor_adapter; - struct viafb_dev *viadev = pdev->dev.platform_data; - struct i2c_board_info ov7670_info = { - .type = "ov7670", - .addr = 0x42 >> 1, - .platform_data = &sensor_cfg, - }; - - /* - * Note that there are actually two capture channels on - * the device. We only deal with one for now. That - * is encoded here; nothing else assumes it's dealing with - * a unique capture device. - */ - struct via_camera *cam; - - /* - * Ensure that frame buffer memory has been set aside for - * this purpose. As an arbitrary limit, refuse to work - * with less than two frames of VGA 16-bit data. - * - * If we ever support the second port, we'll need to set - * aside more memory. - */ - if (viadev->camera_fbmem_size < (VGA_HEIGHT*VGA_WIDTH*4)) { - printk(KERN_ERR "viacam: insufficient FB memory reserved\n"); - return -ENOMEM; - } - if (viadev->engine_mmio == NULL) { - printk(KERN_ERR "viacam: No I/O memory, so no pictures\n"); - return -ENOMEM; - } - - if (machine_is_olpc() && viacam_serial_is_enabled()) - return -EBUSY; - - /* - * Basic structure initialization. - */ - cam = kzalloc (sizeof(struct via_camera), GFP_KERNEL); - if (cam == NULL) - return -ENOMEM; - via_cam_info = cam; - cam->platdev = pdev; - cam->viadev = viadev; - cam->users = 0; - cam->owner = NULL; - cam->opstate = S_IDLE; - cam->user_format = cam->sensor_format = viacam_def_pix_format; - mutex_init(&cam->lock); - INIT_LIST_HEAD(&cam->buffer_queue); - cam->mmio = viadev->engine_mmio; - cam->fbmem = viadev->fbmem; - cam->fb_offset = viadev->camera_fbmem_offset; - cam->flags = 1 << CF_CONFIG_NEEDED; - cam->mbus_code = via_def_mbus_code; - /* - * Tell V4L that we exist. - */ - ret = v4l2_device_register(&pdev->dev, &cam->v4l2_dev); - if (ret) { - dev_err(&pdev->dev, "Unable to register v4l2 device\n"); - 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_board(&cam->v4l2_dev, sensor_adapter, - &ov7670_info, NULL); - if (cam->sensor == NULL) { - dev_err(&pdev->dev, "Unable to find the sensor!\n"); - ret = -ENODEV; - goto out_power_down; - } - /* - * Get the IRQ. - */ - viacam_int_disable(cam); - ret = request_threaded_irq(viadev->pdev->irq, viacam_quick_irq, - viacam_irq, IRQF_SHARED, "via-camera", cam); - if (ret) - goto out_power_down; - /* - * Tell V4l2 that we exist. - */ - cam->vdev = viacam_v4l_template; - cam->vdev.v4l2_dev = &cam->v4l2_dev; - ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1); - if (ret) - goto out_irq; - video_set_drvdata(&cam->vdev, cam); - -#ifdef CONFIG_PM - /* - * Hook into PM events - */ - viacam_pm_hooks.private = cam; - viafb_pm_register(&viacam_pm_hooks); -#endif - - /* Power the sensor down until somebody opens the device */ - via_sensor_power_down(cam); - return 0; - -out_irq: - free_irq(viadev->pdev->irq, cam); -out_power_down: - via_sensor_power_release(cam); -out_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, -}; - -module_platform_driver(viacam_driver); |