diff options
Diffstat (limited to 'kernel/drivers/media/platform/via-camera.c')
| -rw-r--r-- | kernel/drivers/media/platform/via-camera.c | 1476 |
1 files changed, 1476 insertions, 0 deletions
diff --git a/kernel/drivers/media/platform/via-camera.c b/kernel/drivers/media/platform/via-camera.c new file mode 100644 index 000000000..678ed9f35 --- /dev/null +++ b/kernel/drivers/media/platform/via-camera.c @@ -0,0 +1,1476 @@ +/* + * 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-ctrls.h> +#include <media/v4l2-image-sizes.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."); + +/* + * The structure describing our camera. + */ +enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 }; + +struct via_camera { + struct v4l2_device v4l2_dev; + struct v4l2_ctrl_handler ctrl_handler; + 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 __iomem *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; + u32 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 */ + u32 mbus_code; +} via_formats[] = { + { + .desc = "YUYV 4:2:2", + .pixelformat = V4L2_PIX_FMT_YUYV, + .mbus_code = MEDIA_BUS_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 + */ + +/* + * 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; +} + +static int viacam_g_std(struct file *filp, void *priv, v4l2_std_id *std) +{ + *std = V4L2_STD_NTSC_M; + 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 u32 via_def_mbus_code = MEDIA_BUS_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->device_caps = V4L2_CAP_VIDEO_CAPTURE | + V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; + cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; + 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; + struct v4l2_subdev_frame_interval_enum fie = { + .index = interval->index, + .code = cam->mbus_code, + .width = cam->sensor_format.width, + .height = cam->sensor_format.height, + .which = V4L2_SUBDEV_FORMAT_ACTIVE, + }; + int ret; + + mutex_lock(&cam->lock); + ret = sensor_call(cam, pad, enum_frame_interval, NULL, &fie); + mutex_unlock(&cam->lock); + if (ret) + return ret; + interval->type = V4L2_FRMIVAL_TYPE_DISCRETE; + interval->discrete = fie.interval; + return 0; +} + + + +static const struct v4l2_ioctl_ops viacam_ioctl_ops = { + .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_g_std = viacam_g_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, + .fops = &viacam_fops, + .ioctl_ops = &viacam_ioctl_ops, + .release = video_device_release_empty, /* Check this */ +}; + +/* + * The OLPC folks put the serial port on the same pin as + * the camera. They also get grumpy if we break the + * serial port and keep them from using it. So we have + * to check the serial enable bit and not step on it. + */ +#define VIACAM_SERIAL_DEVFN 0x88 +#define VIACAM_SERIAL_CREG 0x46 +#define VIACAM_SERIAL_BIT 0x40 + +static bool viacam_serial_is_enabled(void) +{ + struct pci_bus *pbus = pci_find_bus(0, 0); + u8 cbyte; + + if (!pbus) + return false; + pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN, + VIACAM_SERIAL_CREG, &cbyte); + if ((cbyte & VIACAM_SERIAL_BIT) == 0) + return false; /* Not enabled */ + if (!override_serial) { + printk(KERN_NOTICE "Via camera: serial port is enabled, " \ + "refusing to load.\n"); + printk(KERN_NOTICE "Specify override_serial=1 to force " \ + "module loading.\n"); + return true; + } + printk(KERN_NOTICE "Via camera: overriding serial port\n"); + pci_bus_write_config_byte(pbus, VIACAM_SERIAL_DEVFN, + VIACAM_SERIAL_CREG, cbyte & ~VIACAM_SERIAL_BIT); + return false; +} + +static struct ov7670_config sensor_cfg = { + /* The XO-1.5 (only known user) clocks the camera at 90MHz. */ + .clock_speed = 90, +}; + +static int viacam_probe(struct platform_device *pdev) +{ + int ret; + struct i2c_adapter *sensor_adapter; + struct viafb_dev *viadev = pdev->dev.platform_data; + struct i2c_board_info ov7670_info = { + .type = "ov7670", + .addr = 0x42 >> 1, + .platform_data = &sensor_cfg, + }; + + /* + * Note that there are actually two capture channels on + * the device. We only deal with one for now. That + * is encoded here; nothing else assumes it's dealing with + * a unique capture device. + */ + struct via_camera *cam; + + /* + * Ensure that frame buffer memory has been set aside for + * this purpose. As an arbitrary limit, refuse to work + * with less than two frames of VGA 16-bit data. + * + * If we ever support the second port, we'll need to set + * aside more memory. + */ + if (viadev->camera_fbmem_size < (VGA_HEIGHT*VGA_WIDTH*4)) { + printk(KERN_ERR "viacam: insufficient FB memory reserved\n"); + return -ENOMEM; + } + if (viadev->engine_mmio == NULL) { + printk(KERN_ERR "viacam: No I/O memory, so no pictures\n"); + return -ENOMEM; + } + + if (machine_is_olpc() && viacam_serial_is_enabled()) + return -EBUSY; + + /* + * Basic structure initialization. + */ + cam = kzalloc (sizeof(struct via_camera), GFP_KERNEL); + if (cam == NULL) + return -ENOMEM; + via_cam_info = cam; + cam->platdev = pdev; + cam->viadev = viadev; + cam->users = 0; + cam->owner = NULL; + cam->opstate = S_IDLE; + cam->user_format = cam->sensor_format = viacam_def_pix_format; + mutex_init(&cam->lock); + INIT_LIST_HEAD(&cam->buffer_queue); + cam->mmio = viadev->engine_mmio; + cam->fbmem = viadev->fbmem; + cam->fb_offset = viadev->camera_fbmem_offset; + cam->flags = 1 << CF_CONFIG_NEEDED; + cam->mbus_code = via_def_mbus_code; + /* + * Tell V4L that we exist. + */ + ret = v4l2_device_register(&pdev->dev, &cam->v4l2_dev); + if (ret) { + dev_err(&pdev->dev, "Unable to register v4l2 device\n"); + goto out_free; + } + ret = v4l2_ctrl_handler_init(&cam->ctrl_handler, 10); + if (ret) + goto out_unregister; + cam->v4l2_dev.ctrl_handler = &cam->ctrl_handler; + /* + * Convince the system that we can do DMA. + */ + pdev->dev.dma_mask = &viadev->pdev->dma_mask; + dma_set_mask(&pdev->dev, 0xffffffff); + /* + * Fire up the capture port. The write to 0x78 looks purely + * OLPCish; any system will need to tweak 0x1e. + */ + via_write_reg_mask(VIASR, 0x78, 0, 0x80); + via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0); + /* + * Get the sensor powered up. + */ + ret = via_sensor_power_setup(cam); + if (ret) + goto out_ctrl_hdl_free; + via_sensor_power_up(cam); + + /* + * See if we can't find it on the bus. The VIA_PORT_31 assumption + * is OLPC-specific. 0x42 assumption is ov7670-specific. + */ + sensor_adapter = viafb_find_i2c_adapter(VIA_PORT_31); + cam->sensor = v4l2_i2c_new_subdev_board(&cam->v4l2_dev, sensor_adapter, + &ov7670_info, NULL); + if (cam->sensor == NULL) { + dev_err(&pdev->dev, "Unable to find the sensor!\n"); + ret = -ENODEV; + goto out_power_down; + } + /* + * Get the IRQ. + */ + viacam_int_disable(cam); + ret = request_threaded_irq(viadev->pdev->irq, viacam_quick_irq, + viacam_irq, IRQF_SHARED, "via-camera", cam); + if (ret) + goto out_power_down; + /* + * Tell V4l2 that we exist. + */ + cam->vdev = viacam_v4l_template; + cam->vdev.v4l2_dev = &cam->v4l2_dev; + ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1); + if (ret) + goto out_irq; + video_set_drvdata(&cam->vdev, cam); + +#ifdef CONFIG_PM + /* + * Hook into PM events + */ + viacam_pm_hooks.private = cam; + viafb_pm_register(&viacam_pm_hooks); +#endif + + /* Power the sensor down until somebody opens the device */ + via_sensor_power_down(cam); + return 0; + +out_irq: + free_irq(viadev->pdev->irq, cam); +out_power_down: + via_sensor_power_release(cam); +out_ctrl_hdl_free: + v4l2_ctrl_handler_free(&cam->ctrl_handler); +out_unregister: + v4l2_device_unregister(&cam->v4l2_dev); +out_free: + kfree(cam); + return ret; +} + +static int viacam_remove(struct platform_device *pdev) +{ + struct via_camera *cam = via_cam_info; + struct viafb_dev *viadev = pdev->dev.platform_data; + + video_unregister_device(&cam->vdev); + v4l2_device_unregister(&cam->v4l2_dev); + free_irq(viadev->pdev->irq, cam); + via_sensor_power_release(cam); + v4l2_ctrl_handler_free(&cam->ctrl_handler); + kfree(cam); + via_cam_info = NULL; + return 0; +} + +static struct platform_driver viacam_driver = { + .driver = { + .name = "viafb-camera", + }, + .probe = viacam_probe, + .remove = viacam_remove, +}; + +module_platform_driver(viacam_driver); |