| /* |
| * A driver for the CMOS camera controller in the Marvell 88ALP01 "cafe" |
| * multifunction chip. Currently works with the Omnivision OV7670 |
| * sensor. |
| * |
| * The data sheet for this device can be found at: |
| * http://www.marvell.com/products/pcconn/88ALP01.jsp |
| * |
| * Copyright 2006 One Laptop Per Child Association, Inc. |
| * Copyright 2006-7 Jonathan Corbet <corbet@lwn.net> |
| * |
| * Written by Jonathan Corbet, corbet@lwn.net. |
| * |
| * This file may be distributed under the terms of the GNU General |
| * Public License, version 2. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/fs.h> |
| #include <linux/mm.h> |
| #include <linux/pci.h> |
| #include <linux/i2c.h> |
| #include <linux/interrupt.h> |
| #include <linux/spinlock.h> |
| #include <linux/videodev2.h> |
| #include <media/v4l2-common.h> |
| #include <media/v4l2-ioctl.h> |
| #include <media/v4l2-chip-ident.h> |
| #include <linux/device.h> |
| #include <linux/wait.h> |
| #include <linux/list.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/delay.h> |
| #include <linux/debugfs.h> |
| #include <linux/jiffies.h> |
| #include <linux/vmalloc.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/io.h> |
| |
| #include "cafe_ccic-regs.h" |
| |
| #define CAFE_VERSION 0x000002 |
| |
| |
| /* |
| * Parameters. |
| */ |
| MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>"); |
| MODULE_DESCRIPTION("Marvell 88ALP01 CMOS Camera Controller driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_SUPPORTED_DEVICE("Video"); |
| |
| /* |
| * Internal DMA buffer management. Since the controller cannot do S/G I/O, |
| * we must have physically contiguous buffers to bring frames into. |
| * These parameters control how many buffers we use, whether we |
| * allocate them at load time (better chance of success, but nails down |
| * memory) or when somebody tries to use the camera (riskier), and, |
| * for load-time allocation, how big they should be. |
| * |
| * The controller can cycle through three buffers. We could use |
| * more by flipping pointers around, but it probably makes little |
| * sense. |
| */ |
| |
| #define MAX_DMA_BUFS 3 |
| static int alloc_bufs_at_read; |
| module_param(alloc_bufs_at_read, bool, 0444); |
| MODULE_PARM_DESC(alloc_bufs_at_read, |
| "Non-zero value causes DMA buffers to be allocated when the " |
| "video capture device is read, rather than at module load " |
| "time. This saves memory, but decreases the chances of " |
| "successfully getting those buffers."); |
| |
| static int n_dma_bufs = 3; |
| module_param(n_dma_bufs, uint, 0644); |
| MODULE_PARM_DESC(n_dma_bufs, |
| "The number of DMA buffers to allocate. Can be either two " |
| "(saves memory, makes timing tighter) or three."); |
| |
| static int dma_buf_size = VGA_WIDTH * VGA_HEIGHT * 2; /* Worst case */ |
| module_param(dma_buf_size, uint, 0444); |
| MODULE_PARM_DESC(dma_buf_size, |
| "The size of the allocated DMA buffers. If actual operating " |
| "parameters require larger buffers, an attempt to reallocate " |
| "will be made."); |
| |
| static int min_buffers = 1; |
| module_param(min_buffers, uint, 0644); |
| MODULE_PARM_DESC(min_buffers, |
| "The minimum number of streaming I/O buffers we are willing " |
| "to work with."); |
| |
| static int max_buffers = 10; |
| module_param(max_buffers, uint, 0644); |
| MODULE_PARM_DESC(max_buffers, |
| "The maximum number of streaming I/O buffers an application " |
| "will be allowed to allocate. These buffers are big and live " |
| "in vmalloc space."); |
| |
| static int flip; |
| module_param(flip, bool, 0444); |
| MODULE_PARM_DESC(flip, |
| "If set, the sensor will be instructed to flip the image " |
| "vertically."); |
| |
| |
| enum cafe_state { |
| S_NOTREADY, /* Not yet initialized */ |
| S_IDLE, /* Just hanging around */ |
| S_FLAKED, /* Some sort of problem */ |
| S_SINGLEREAD, /* In read() */ |
| S_SPECREAD, /* Speculative read (for future read()) */ |
| S_STREAMING /* Streaming data */ |
| }; |
| |
| /* |
| * Tracking of streaming I/O buffers. |
| */ |
| struct cafe_sio_buffer { |
| struct list_head list; |
| struct v4l2_buffer v4lbuf; |
| char *buffer; /* Where it lives in kernel space */ |
| int mapcount; |
| struct cafe_camera *cam; |
| }; |
| |
| /* |
| * A description of one of our devices. |
| * Locking: controlled by s_mutex. Certain fields, however, require |
| * the dev_lock spinlock; they are marked as such by comments. |
| * dev_lock is also required for access to device registers. |
| */ |
| struct cafe_camera |
| { |
| enum cafe_state state; |
| unsigned long flags; /* Buffer status, mainly (dev_lock) */ |
| int users; /* How many open FDs */ |
| struct file *owner; /* Who has data access (v4l2) */ |
| |
| /* |
| * Subsystem structures. |
| */ |
| struct pci_dev *pdev; |
| struct video_device v4ldev; |
| struct i2c_adapter i2c_adapter; |
| struct i2c_client *sensor; |
| |
| unsigned char __iomem *regs; |
| struct list_head dev_list; /* link to other devices */ |
| |
| /* DMA buffers */ |
| unsigned int nbufs; /* How many are alloc'd */ |
| int next_buf; /* Next to consume (dev_lock) */ |
| unsigned int dma_buf_size; /* allocated size */ |
| void *dma_bufs[MAX_DMA_BUFS]; /* Internal buffer addresses */ |
| dma_addr_t dma_handles[MAX_DMA_BUFS]; /* Buffer bus addresses */ |
| unsigned int specframes; /* Unconsumed spec frames (dev_lock) */ |
| unsigned int sequence; /* Frame sequence number */ |
| unsigned int buf_seq[MAX_DMA_BUFS]; /* Sequence for individual buffers */ |
| |
| /* Streaming buffers */ |
| unsigned int n_sbufs; /* How many we have */ |
| struct cafe_sio_buffer *sb_bufs; /* The array of housekeeping structs */ |
| struct list_head sb_avail; /* Available for data (we own) (dev_lock) */ |
| struct list_head sb_full; /* With data (user space owns) (dev_lock) */ |
| struct tasklet_struct s_tasklet; |
| |
| /* Current operating parameters */ |
| u32 sensor_type; /* Currently ov7670 only */ |
| struct v4l2_pix_format pix_format; |
| |
| /* Locks */ |
| struct mutex s_mutex; /* Access to this structure */ |
| spinlock_t dev_lock; /* Access to device */ |
| |
| /* Misc */ |
| wait_queue_head_t smbus_wait; /* Waiting on i2c events */ |
| wait_queue_head_t iowait; /* Waiting on frame data */ |
| #ifdef CONFIG_VIDEO_ADV_DEBUG |
| struct dentry *dfs_regs; |
| struct dentry *dfs_cam_regs; |
| #endif |
| }; |
| |
| /* |
| * Status flags. Always manipulated with bit operations. |
| */ |
| #define CF_BUF0_VALID 0 /* Buffers valid - first three */ |
| #define CF_BUF1_VALID 1 |
| #define CF_BUF2_VALID 2 |
| #define CF_DMA_ACTIVE 3 /* A frame is incoming */ |
| #define CF_CONFIG_NEEDED 4 /* Must configure hardware */ |
| |
| |
| |
| /* |
| * Start over with DMA buffers - dev_lock needed. |
| */ |
| static void cafe_reset_buffers(struct cafe_camera *cam) |
| { |
| int i; |
| |
| cam->next_buf = -1; |
| for (i = 0; i < cam->nbufs; i++) |
| clear_bit(i, &cam->flags); |
| cam->specframes = 0; |
| } |
| |
| static inline int cafe_needs_config(struct cafe_camera *cam) |
| { |
| return test_bit(CF_CONFIG_NEEDED, &cam->flags); |
| } |
| |
| static void cafe_set_config_needed(struct cafe_camera *cam, int needed) |
| { |
| if (needed) |
| set_bit(CF_CONFIG_NEEDED, &cam->flags); |
| else |
| clear_bit(CF_CONFIG_NEEDED, &cam->flags); |
| } |
| |
| |
| |
| |
| /* |
| * Debugging and related. |
| */ |
| #define cam_err(cam, fmt, arg...) \ |
| dev_err(&(cam)->pdev->dev, fmt, ##arg); |
| #define cam_warn(cam, fmt, arg...) \ |
| dev_warn(&(cam)->pdev->dev, fmt, ##arg); |
| #define cam_dbg(cam, fmt, arg...) \ |
| dev_dbg(&(cam)->pdev->dev, fmt, ##arg); |
| |
| |
| /* ---------------------------------------------------------------------*/ |
| /* |
| * We keep a simple list of known devices to search at open time. |
| */ |
| static LIST_HEAD(cafe_dev_list); |
| static DEFINE_MUTEX(cafe_dev_list_lock); |
| |
| static void cafe_add_dev(struct cafe_camera *cam) |
| { |
| mutex_lock(&cafe_dev_list_lock); |
| list_add_tail(&cam->dev_list, &cafe_dev_list); |
| mutex_unlock(&cafe_dev_list_lock); |
| } |
| |
| static void cafe_remove_dev(struct cafe_camera *cam) |
| { |
| mutex_lock(&cafe_dev_list_lock); |
| list_del(&cam->dev_list); |
| mutex_unlock(&cafe_dev_list_lock); |
| } |
| |
| static struct cafe_camera *cafe_find_dev(int minor) |
| { |
| struct cafe_camera *cam; |
| |
| mutex_lock(&cafe_dev_list_lock); |
| list_for_each_entry(cam, &cafe_dev_list, dev_list) { |
| if (cam->v4ldev.minor == minor) |
| goto done; |
| } |
| cam = NULL; |
| done: |
| mutex_unlock(&cafe_dev_list_lock); |
| return cam; |
| } |
| |
| |
| static struct cafe_camera *cafe_find_by_pdev(struct pci_dev *pdev) |
| { |
| struct cafe_camera *cam; |
| |
| mutex_lock(&cafe_dev_list_lock); |
| list_for_each_entry(cam, &cafe_dev_list, dev_list) { |
| if (cam->pdev == pdev) |
| goto done; |
| } |
| cam = NULL; |
| done: |
| mutex_unlock(&cafe_dev_list_lock); |
| return cam; |
| } |
| |
| |
| /* ------------------------------------------------------------------------ */ |
| /* |
| * Device register I/O |
| */ |
| static inline void cafe_reg_write(struct cafe_camera *cam, unsigned int reg, |
| unsigned int val) |
| { |
| iowrite32(val, cam->regs + reg); |
| } |
| |
| static inline unsigned int cafe_reg_read(struct cafe_camera *cam, |
| unsigned int reg) |
| { |
| return ioread32(cam->regs + reg); |
| } |
| |
| |
| static inline void cafe_reg_write_mask(struct cafe_camera *cam, unsigned int reg, |
| unsigned int val, unsigned int mask) |
| { |
| unsigned int v = cafe_reg_read(cam, reg); |
| |
| v = (v & ~mask) | (val & mask); |
| cafe_reg_write(cam, reg, v); |
| } |
| |
| static inline void cafe_reg_clear_bit(struct cafe_camera *cam, |
| unsigned int reg, unsigned int val) |
| { |
| cafe_reg_write_mask(cam, reg, 0, val); |
| } |
| |
| static inline void cafe_reg_set_bit(struct cafe_camera *cam, |
| unsigned int reg, unsigned int val) |
| { |
| cafe_reg_write_mask(cam, reg, val, val); |
| } |
| |
| |
| |
| /* -------------------------------------------------------------------- */ |
| /* |
| * The I2C/SMBUS interface to the camera itself starts here. The |
| * controller handles SMBUS itself, presenting a relatively simple register |
| * interface; all we have to do is to tell it where to route the data. |
| */ |
| #define CAFE_SMBUS_TIMEOUT (HZ) /* generous */ |
| |
| static int cafe_smbus_write_done(struct cafe_camera *cam) |
| { |
| unsigned long flags; |
| int c1; |
| |
| /* |
| * We must delay after the interrupt, or the controller gets confused |
| * and never does give us good status. Fortunately, we don't do this |
| * often. |
| */ |
| udelay(20); |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| c1 = cafe_reg_read(cam, REG_TWSIC1); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| return (c1 & (TWSIC1_WSTAT|TWSIC1_ERROR)) != TWSIC1_WSTAT; |
| } |
| |
| static int cafe_smbus_write_data(struct cafe_camera *cam, |
| u16 addr, u8 command, u8 value) |
| { |
| unsigned int rval; |
| unsigned long flags; |
| DEFINE_WAIT(the_wait); |
| |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID); |
| rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */ |
| /* |
| * Marvell sez set clkdiv to all 1's for now. |
| */ |
| rval |= TWSIC0_CLKDIV; |
| cafe_reg_write(cam, REG_TWSIC0, rval); |
| (void) cafe_reg_read(cam, REG_TWSIC1); /* force write */ |
| rval = value | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR); |
| cafe_reg_write(cam, REG_TWSIC1, rval); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| |
| /* |
| * Time to wait for the write to complete. THIS IS A RACY |
| * WAY TO DO IT, but the sad fact is that reading the TWSIC1 |
| * register too quickly after starting the operation sends |
| * the device into a place that may be kinder and better, but |
| * which is absolutely useless for controlling the sensor. In |
| * practice we have plenty of time to get into our sleep state |
| * before the interrupt hits, and the worst case is that we |
| * time out and then see that things completed, so this seems |
| * the best way for now. |
| */ |
| do { |
| prepare_to_wait(&cam->smbus_wait, &the_wait, |
| TASK_UNINTERRUPTIBLE); |
| schedule_timeout(1); /* even 1 jiffy is too long */ |
| finish_wait(&cam->smbus_wait, &the_wait); |
| } while (!cafe_smbus_write_done(cam)); |
| |
| #ifdef IF_THE_CAFE_HARDWARE_WORKED_RIGHT |
| wait_event_timeout(cam->smbus_wait, cafe_smbus_write_done(cam), |
| CAFE_SMBUS_TIMEOUT); |
| #endif |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| rval = cafe_reg_read(cam, REG_TWSIC1); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| |
| if (rval & TWSIC1_WSTAT) { |
| cam_err(cam, "SMBUS write (%02x/%02x/%02x) timed out\n", addr, |
| command, value); |
| return -EIO; |
| } |
| if (rval & TWSIC1_ERROR) { |
| cam_err(cam, "SMBUS write (%02x/%02x/%02x) error\n", addr, |
| command, value); |
| return -EIO; |
| } |
| return 0; |
| } |
| |
| |
| |
| static int cafe_smbus_read_done(struct cafe_camera *cam) |
| { |
| unsigned long flags; |
| int c1; |
| |
| /* |
| * We must delay after the interrupt, or the controller gets confused |
| * and never does give us good status. Fortunately, we don't do this |
| * often. |
| */ |
| udelay(20); |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| c1 = cafe_reg_read(cam, REG_TWSIC1); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| return c1 & (TWSIC1_RVALID|TWSIC1_ERROR); |
| } |
| |
| |
| |
| static int cafe_smbus_read_data(struct cafe_camera *cam, |
| u16 addr, u8 command, u8 *value) |
| { |
| unsigned int rval; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID); |
| rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */ |
| /* |
| * Marvel sez set clkdiv to all 1's for now. |
| */ |
| rval |= TWSIC0_CLKDIV; |
| cafe_reg_write(cam, REG_TWSIC0, rval); |
| (void) cafe_reg_read(cam, REG_TWSIC1); /* force write */ |
| rval = TWSIC1_READ | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR); |
| cafe_reg_write(cam, REG_TWSIC1, rval); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| |
| wait_event_timeout(cam->smbus_wait, |
| cafe_smbus_read_done(cam), CAFE_SMBUS_TIMEOUT); |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| rval = cafe_reg_read(cam, REG_TWSIC1); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| |
| if (rval & TWSIC1_ERROR) { |
| cam_err(cam, "SMBUS read (%02x/%02x) error\n", addr, command); |
| return -EIO; |
| } |
| if (! (rval & TWSIC1_RVALID)) { |
| cam_err(cam, "SMBUS read (%02x/%02x) timed out\n", addr, |
| command); |
| return -EIO; |
| } |
| *value = rval & 0xff; |
| return 0; |
| } |
| |
| /* |
| * Perform a transfer over SMBUS. This thing is called under |
| * the i2c bus lock, so we shouldn't race with ourselves... |
| */ |
| static int cafe_smbus_xfer(struct i2c_adapter *adapter, u16 addr, |
| unsigned short flags, char rw, u8 command, |
| int size, union i2c_smbus_data *data) |
| { |
| struct cafe_camera *cam = i2c_get_adapdata(adapter); |
| int ret = -EINVAL; |
| |
| /* |
| * Refuse to talk to anything but OV cam chips. We should |
| * never even see an attempt to do so, but one never knows. |
| */ |
| if (cam->sensor && addr != cam->sensor->addr) { |
| cam_err(cam, "funky smbus addr %d\n", addr); |
| return -EINVAL; |
| } |
| /* |
| * This interface would appear to only do byte data ops. OK |
| * it can do word too, but the cam chip has no use for that. |
| */ |
| if (size != I2C_SMBUS_BYTE_DATA) { |
| cam_err(cam, "funky xfer size %d\n", size); |
| return -EINVAL; |
| } |
| |
| if (rw == I2C_SMBUS_WRITE) |
| ret = cafe_smbus_write_data(cam, addr, command, data->byte); |
| else if (rw == I2C_SMBUS_READ) |
| ret = cafe_smbus_read_data(cam, addr, command, &data->byte); |
| return ret; |
| } |
| |
| |
| static void cafe_smbus_enable_irq(struct cafe_camera *cam) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| cafe_reg_set_bit(cam, REG_IRQMASK, TWSIIRQS); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| } |
| |
| static u32 cafe_smbus_func(struct i2c_adapter *adapter) |
| { |
| return I2C_FUNC_SMBUS_READ_BYTE_DATA | |
| I2C_FUNC_SMBUS_WRITE_BYTE_DATA; |
| } |
| |
| static struct i2c_algorithm cafe_smbus_algo = { |
| .smbus_xfer = cafe_smbus_xfer, |
| .functionality = cafe_smbus_func |
| }; |
| |
| /* Somebody is on the bus */ |
| static int cafe_cam_init(struct cafe_camera *cam); |
| static void cafe_ctlr_stop_dma(struct cafe_camera *cam); |
| static void cafe_ctlr_power_down(struct cafe_camera *cam); |
| |
| static int cafe_smbus_attach(struct i2c_client *client) |
| { |
| struct cafe_camera *cam = i2c_get_adapdata(client->adapter); |
| |
| /* |
| * Don't talk to chips we don't recognize. |
| */ |
| if (client->driver->id == I2C_DRIVERID_OV7670) { |
| cam->sensor = client; |
| return cafe_cam_init(cam); |
| } |
| return -EINVAL; |
| } |
| |
| static int cafe_smbus_detach(struct i2c_client *client) |
| { |
| struct cafe_camera *cam = i2c_get_adapdata(client->adapter); |
| |
| if (cam->sensor == client) { |
| cafe_ctlr_stop_dma(cam); |
| cafe_ctlr_power_down(cam); |
| cam_err(cam, "lost the sensor!\n"); |
| cam->sensor = NULL; /* Bummer, no camera */ |
| cam->state = S_NOTREADY; |
| } |
| return 0; |
| } |
| |
| static int cafe_smbus_setup(struct cafe_camera *cam) |
| { |
| struct i2c_adapter *adap = &cam->i2c_adapter; |
| int ret; |
| |
| cafe_smbus_enable_irq(cam); |
| adap->id = I2C_HW_SMBUS_CAFE; |
| adap->class = I2C_CLASS_CAM_DIGITAL; |
| adap->owner = THIS_MODULE; |
| adap->client_register = cafe_smbus_attach; |
| adap->client_unregister = cafe_smbus_detach; |
| adap->algo = &cafe_smbus_algo; |
| strcpy(adap->name, "cafe_ccic"); |
| adap->dev.parent = &cam->pdev->dev; |
| i2c_set_adapdata(adap, cam); |
| ret = i2c_add_adapter(adap); |
| if (ret) |
| printk(KERN_ERR "Unable to register cafe i2c adapter\n"); |
| return ret; |
| } |
| |
| static void cafe_smbus_shutdown(struct cafe_camera *cam) |
| { |
| i2c_del_adapter(&cam->i2c_adapter); |
| } |
| |
| |
| /* ------------------------------------------------------------------- */ |
| /* |
| * Deal with the controller. |
| */ |
| |
| /* |
| * Do everything we think we need to have the interface operating |
| * according to the desired format. |
| */ |
| static void cafe_ctlr_dma(struct cafe_camera *cam) |
| { |
| /* |
| * Store the first two Y buffers (we aren't supporting |
| * planar formats for now, so no UV bufs). Then either |
| * set the third if it exists, or tell the controller |
| * to just use two. |
| */ |
| cafe_reg_write(cam, REG_Y0BAR, cam->dma_handles[0]); |
| cafe_reg_write(cam, REG_Y1BAR, cam->dma_handles[1]); |
| if (cam->nbufs > 2) { |
| cafe_reg_write(cam, REG_Y2BAR, cam->dma_handles[2]); |
| cafe_reg_clear_bit(cam, REG_CTRL1, C1_TWOBUFS); |
| } |
| else |
| cafe_reg_set_bit(cam, REG_CTRL1, C1_TWOBUFS); |
| cafe_reg_write(cam, REG_UBAR, 0); /* 32 bits only for now */ |
| } |
| |
| static void cafe_ctlr_image(struct cafe_camera *cam) |
| { |
| int imgsz; |
| struct v4l2_pix_format *fmt = &cam->pix_format; |
| |
| imgsz = ((fmt->height << IMGSZ_V_SHIFT) & IMGSZ_V_MASK) | |
| (fmt->bytesperline & IMGSZ_H_MASK); |
| cafe_reg_write(cam, REG_IMGSIZE, imgsz); |
| cafe_reg_write(cam, REG_IMGOFFSET, 0); |
| /* YPITCH just drops the last two bits */ |
| cafe_reg_write_mask(cam, REG_IMGPITCH, fmt->bytesperline, |
| IMGP_YP_MASK); |
| /* |
| * Tell the controller about the image format we are using. |
| */ |
| switch (cam->pix_format.pixelformat) { |
| case V4L2_PIX_FMT_YUYV: |
| cafe_reg_write_mask(cam, REG_CTRL0, |
| C0_DF_YUV|C0_YUV_PACKED|C0_YUVE_YUYV, |
| C0_DF_MASK); |
| break; |
| |
| case V4L2_PIX_FMT_RGB444: |
| cafe_reg_write_mask(cam, REG_CTRL0, |
| C0_DF_RGB|C0_RGBF_444|C0_RGB4_XRGB, |
| C0_DF_MASK); |
| /* Alpha value? */ |
| break; |
| |
| case V4L2_PIX_FMT_RGB565: |
| cafe_reg_write_mask(cam, REG_CTRL0, |
| C0_DF_RGB|C0_RGBF_565|C0_RGB5_BGGR, |
| C0_DF_MASK); |
| break; |
| |
| default: |
| cam_err(cam, "Unknown format %x\n", cam->pix_format.pixelformat); |
| break; |
| } |
| /* |
| * Make sure it knows we want to use hsync/vsync. |
| */ |
| cafe_reg_write_mask(cam, REG_CTRL0, C0_SIF_HVSYNC, |
| C0_SIFM_MASK); |
| } |
| |
| |
| /* |
| * Configure the controller for operation; caller holds the |
| * device mutex. |
| */ |
| static int cafe_ctlr_configure(struct cafe_camera *cam) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| cafe_ctlr_dma(cam); |
| cafe_ctlr_image(cam); |
| cafe_set_config_needed(cam, 0); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| return 0; |
| } |
| |
| static void cafe_ctlr_irq_enable(struct cafe_camera *cam) |
| { |
| /* |
| * Clear any pending interrupts, since we do not |
| * expect to have I/O active prior to enabling. |
| */ |
| cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS); |
| cafe_reg_set_bit(cam, REG_IRQMASK, FRAMEIRQS); |
| } |
| |
| static void cafe_ctlr_irq_disable(struct cafe_camera *cam) |
| { |
| cafe_reg_clear_bit(cam, REG_IRQMASK, FRAMEIRQS); |
| } |
| |
| /* |
| * Make the controller start grabbing images. Everything must |
| * be set up before doing this. |
| */ |
| static void cafe_ctlr_start(struct cafe_camera *cam) |
| { |
| /* set_bit performs a read, so no other barrier should be |
| needed here */ |
| cafe_reg_set_bit(cam, REG_CTRL0, C0_ENABLE); |
| } |
| |
| static void cafe_ctlr_stop(struct cafe_camera *cam) |
| { |
| cafe_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE); |
| } |
| |
| static void cafe_ctlr_init(struct cafe_camera *cam) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| /* |
| * Added magic to bring up the hardware on the B-Test board |
| */ |
| cafe_reg_write(cam, 0x3038, 0x8); |
| cafe_reg_write(cam, 0x315c, 0x80008); |
| /* |
| * Go through the dance needed to wake the device up. |
| * Note that these registers are global and shared |
| * with the NAND and SD devices. Interaction between the |
| * three still needs to be examined. |
| */ |
| cafe_reg_write(cam, REG_GL_CSR, GCSR_SRS|GCSR_MRS); /* Needed? */ |
| cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRC); |
| cafe_reg_write(cam, REG_GL_CSR, GCSR_SRC|GCSR_MRS); |
| /* |
| * Here we must wait a bit for the controller to come around. |
| */ |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| msleep(5); |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| |
| cafe_reg_write(cam, REG_GL_CSR, GCSR_CCIC_EN|GCSR_SRC|GCSR_MRC); |
| cafe_reg_set_bit(cam, REG_GL_IMASK, GIMSK_CCIC_EN); |
| /* |
| * Make sure it's not powered down. |
| */ |
| cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN); |
| /* |
| * Turn off the enable bit. It sure should be off anyway, |
| * but it's good to be sure. |
| */ |
| cafe_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE); |
| /* |
| * Mask all interrupts. |
| */ |
| cafe_reg_write(cam, REG_IRQMASK, 0); |
| /* |
| * Clock the sensor appropriately. Controller clock should |
| * be 48MHz, sensor "typical" value is half that. |
| */ |
| cafe_reg_write_mask(cam, REG_CLKCTRL, 2, CLK_DIV_MASK); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| } |
| |
| |
| /* |
| * Stop the controller, and don't return until we're really sure that no |
| * further DMA is going on. |
| */ |
| static void cafe_ctlr_stop_dma(struct cafe_camera *cam) |
| { |
| unsigned long flags; |
| |
| /* |
| * Theory: stop the camera controller (whether it is operating |
| * or not). Delay briefly just in case we race with the SOF |
| * interrupt, then wait until no DMA is active. |
| */ |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| cafe_ctlr_stop(cam); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| mdelay(1); |
| wait_event_timeout(cam->iowait, |
| !test_bit(CF_DMA_ACTIVE, &cam->flags), HZ); |
| if (test_bit(CF_DMA_ACTIVE, &cam->flags)) |
| cam_err(cam, "Timeout waiting for DMA to end\n"); |
| /* This would be bad news - what now? */ |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| cam->state = S_IDLE; |
| cafe_ctlr_irq_disable(cam); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| } |
| |
| /* |
| * Power up and down. |
| */ |
| static void cafe_ctlr_power_up(struct cafe_camera *cam) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| cafe_reg_clear_bit(cam, REG_CTRL1, C1_PWRDWN); |
| /* |
| * Part one of the sensor dance: turn the global |
| * GPIO signal on. |
| */ |
| cafe_reg_write(cam, REG_GL_FCR, GFCR_GPIO_ON); |
| cafe_reg_write(cam, REG_GL_GPIOR, GGPIO_OUT|GGPIO_VAL); |
| /* |
| * Put the sensor into operational mode (assumes OLPC-style |
| * wiring). Control 0 is reset - set to 1 to operate. |
| * Control 1 is power down, set to 0 to operate. |
| */ |
| cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN); /* pwr up, reset */ |
| // mdelay(1); /* Marvell says 1ms will do it */ |
| cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C0); |
| // mdelay(1); /* Enough? */ |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| msleep(5); /* Just to be sure */ |
| } |
| |
| static void cafe_ctlr_power_down(struct cafe_camera *cam) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| cafe_reg_write(cam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C1); |
| cafe_reg_write(cam, REG_GL_FCR, GFCR_GPIO_ON); |
| cafe_reg_write(cam, REG_GL_GPIOR, GGPIO_OUT); |
| cafe_reg_set_bit(cam, REG_CTRL1, C1_PWRDWN); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| } |
| |
| /* -------------------------------------------------------------------- */ |
| /* |
| * Communications with the sensor. |
| */ |
| |
| static int __cafe_cam_cmd(struct cafe_camera *cam, int cmd, void *arg) |
| { |
| struct i2c_client *sc = cam->sensor; |
| int ret; |
| |
| if (sc == NULL || sc->driver == NULL || sc->driver->command == NULL) |
| return -EINVAL; |
| ret = sc->driver->command(sc, cmd, arg); |
| if (ret == -EPERM) /* Unsupported command */ |
| return 0; |
| return ret; |
| } |
| |
| static int __cafe_cam_reset(struct cafe_camera *cam) |
| { |
| int zero = 0; |
| return __cafe_cam_cmd(cam, VIDIOC_INT_RESET, &zero); |
| } |
| |
| /* |
| * We have found the sensor on the i2c. Let's try to have a |
| * conversation. |
| */ |
| static int cafe_cam_init(struct cafe_camera *cam) |
| { |
| struct v4l2_chip_ident chip = { V4L2_CHIP_MATCH_I2C_ADDR, 0, 0, 0 }; |
| int ret; |
| |
| mutex_lock(&cam->s_mutex); |
| if (cam->state != S_NOTREADY) |
| cam_warn(cam, "Cam init with device in funky state %d", |
| cam->state); |
| ret = __cafe_cam_reset(cam); |
| if (ret) |
| goto out; |
| chip.match_chip = cam->sensor->addr; |
| ret = __cafe_cam_cmd(cam, VIDIOC_G_CHIP_IDENT, &chip); |
| if (ret) |
| goto out; |
| cam->sensor_type = chip.ident; |
| // if (cam->sensor->addr != OV7xx0_SID) { |
| if (cam->sensor_type != V4L2_IDENT_OV7670) { |
| cam_err(cam, "Unsupported sensor type %d", cam->sensor->addr); |
| ret = -EINVAL; |
| goto out; |
| } |
| /* Get/set parameters? */ |
| ret = 0; |
| cam->state = S_IDLE; |
| out: |
| cafe_ctlr_power_down(cam); |
| mutex_unlock(&cam->s_mutex); |
| return ret; |
| } |
| |
| /* |
| * Configure the sensor to match the parameters we have. Caller should |
| * hold s_mutex |
| */ |
| static int cafe_cam_set_flip(struct cafe_camera *cam) |
| { |
| struct v4l2_control ctrl; |
| |
| memset(&ctrl, 0, sizeof(ctrl)); |
| ctrl.id = V4L2_CID_VFLIP; |
| ctrl.value = flip; |
| return __cafe_cam_cmd(cam, VIDIOC_S_CTRL, &ctrl); |
| } |
| |
| |
| static int cafe_cam_configure(struct cafe_camera *cam) |
| { |
| struct v4l2_format fmt; |
| int ret, zero = 0; |
| |
| if (cam->state != S_IDLE) |
| return -EINVAL; |
| fmt.fmt.pix = cam->pix_format; |
| ret = __cafe_cam_cmd(cam, VIDIOC_INT_INIT, &zero); |
| if (ret == 0) |
| ret = __cafe_cam_cmd(cam, VIDIOC_S_FMT, &fmt); |
| /* |
| * OV7670 does weird things if flip is set *before* format... |
| */ |
| ret += cafe_cam_set_flip(cam); |
| return ret; |
| } |
| |
| /* -------------------------------------------------------------------- */ |
| /* |
| * DMA buffer management. These functions need s_mutex held. |
| */ |
| |
| /* FIXME: this is inefficient as hell, since dma_alloc_coherent just |
| * does a get_free_pages() call, and we waste a good chunk of an orderN |
| * allocation. Should try to allocate the whole set in one chunk. |
| */ |
| static int cafe_alloc_dma_bufs(struct cafe_camera *cam, int loadtime) |
| { |
| int i; |
| |
| cafe_set_config_needed(cam, 1); |
| if (loadtime) |
| cam->dma_buf_size = dma_buf_size; |
| else |
| cam->dma_buf_size = cam->pix_format.sizeimage; |
| if (n_dma_bufs > 3) |
| n_dma_bufs = 3; |
| |
| cam->nbufs = 0; |
| for (i = 0; i < n_dma_bufs; i++) { |
| cam->dma_bufs[i] = dma_alloc_coherent(&cam->pdev->dev, |
| cam->dma_buf_size, cam->dma_handles + i, |
| GFP_KERNEL); |
| if (cam->dma_bufs[i] == NULL) { |
| cam_warn(cam, "Failed to allocate DMA buffer\n"); |
| break; |
| } |
| /* For debug, remove eventually */ |
| memset(cam->dma_bufs[i], 0xcc, cam->dma_buf_size); |
| (cam->nbufs)++; |
| } |
| |
| switch (cam->nbufs) { |
| case 1: |
| dma_free_coherent(&cam->pdev->dev, cam->dma_buf_size, |
| cam->dma_bufs[0], cam->dma_handles[0]); |
| cam->nbufs = 0; |
| case 0: |
| cam_err(cam, "Insufficient DMA buffers, cannot operate\n"); |
| return -ENOMEM; |
| |
| case 2: |
| if (n_dma_bufs > 2) |
| cam_warn(cam, "Will limp along with only 2 buffers\n"); |
| break; |
| } |
| return 0; |
| } |
| |
| static void cafe_free_dma_bufs(struct cafe_camera *cam) |
| { |
| int i; |
| |
| for (i = 0; i < cam->nbufs; i++) { |
| dma_free_coherent(&cam->pdev->dev, cam->dma_buf_size, |
| cam->dma_bufs[i], cam->dma_handles[i]); |
| cam->dma_bufs[i] = NULL; |
| } |
| cam->nbufs = 0; |
| } |
| |
| |
| |
| |
| |
| /* ----------------------------------------------------------------------- */ |
| /* |
| * Here starts the V4L2 interface code. |
| */ |
| |
| /* |
| * Read an image from the device. |
| */ |
| static ssize_t cafe_deliver_buffer(struct cafe_camera *cam, |
| char __user *buffer, size_t len, loff_t *pos) |
| { |
| int bufno; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| if (cam->next_buf < 0) { |
| cam_err(cam, "deliver_buffer: No next buffer\n"); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| return -EIO; |
| } |
| bufno = cam->next_buf; |
| clear_bit(bufno, &cam->flags); |
| if (++(cam->next_buf) >= cam->nbufs) |
| cam->next_buf = 0; |
| if (! test_bit(cam->next_buf, &cam->flags)) |
| cam->next_buf = -1; |
| cam->specframes = 0; |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| |
| if (len > cam->pix_format.sizeimage) |
| len = cam->pix_format.sizeimage; |
| if (copy_to_user(buffer, cam->dma_bufs[bufno], len)) |
| return -EFAULT; |
| (*pos) += len; |
| return len; |
| } |
| |
| /* |
| * Get everything ready, and start grabbing frames. |
| */ |
| static int cafe_read_setup(struct cafe_camera *cam, enum cafe_state state) |
| { |
| int ret; |
| unsigned long flags; |
| |
| /* |
| * Configuration. If we still don't have DMA buffers, |
| * make one last, desperate attempt. |
| */ |
| if (cam->nbufs == 0) |
| if (cafe_alloc_dma_bufs(cam, 0)) |
| return -ENOMEM; |
| |
| if (cafe_needs_config(cam)) { |
| cafe_cam_configure(cam); |
| ret = cafe_ctlr_configure(cam); |
| if (ret) |
| return ret; |
| } |
| |
| /* |
| * Turn it loose. |
| */ |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| cafe_reset_buffers(cam); |
| cafe_ctlr_irq_enable(cam); |
| cam->state = state; |
| cafe_ctlr_start(cam); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| return 0; |
| } |
| |
| |
| static ssize_t cafe_v4l_read(struct file *filp, |
| char __user *buffer, size_t len, loff_t *pos) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| int ret = 0; |
| |
| /* |
| * Perhaps we're in speculative read mode and already |
| * have data? |
| */ |
| mutex_lock(&cam->s_mutex); |
| if (cam->state == S_SPECREAD) { |
| if (cam->next_buf >= 0) { |
| ret = cafe_deliver_buffer(cam, buffer, len, pos); |
| if (ret != 0) |
| goto out_unlock; |
| } |
| } else if (cam->state == S_FLAKED || cam->state == S_NOTREADY) { |
| ret = -EIO; |
| goto out_unlock; |
| } else if (cam->state != S_IDLE) { |
| ret = -EBUSY; |
| goto out_unlock; |
| } |
| |
| /* |
| * v4l2: multiple processes can open the device, but only |
| * one gets to grab data from it. |
| */ |
| if (cam->owner && cam->owner != filp) { |
| ret = -EBUSY; |
| goto out_unlock; |
| } |
| cam->owner = filp; |
| |
| /* |
| * Do setup if need be. |
| */ |
| if (cam->state != S_SPECREAD) { |
| ret = cafe_read_setup(cam, S_SINGLEREAD); |
| if (ret) |
| goto out_unlock; |
| } |
| /* |
| * Wait for something to happen. This should probably |
| * be interruptible (FIXME). |
| */ |
| wait_event_timeout(cam->iowait, cam->next_buf >= 0, HZ); |
| if (cam->next_buf < 0) { |
| cam_err(cam, "read() operation timed out\n"); |
| cafe_ctlr_stop_dma(cam); |
| ret = -EIO; |
| goto out_unlock; |
| } |
| /* |
| * Give them their data and we should be done. |
| */ |
| ret = cafe_deliver_buffer(cam, buffer, len, pos); |
| |
| out_unlock: |
| mutex_unlock(&cam->s_mutex); |
| return ret; |
| } |
| |
| |
| |
| |
| |
| |
| |
| |
| /* |
| * Streaming I/O support. |
| */ |
| |
| |
| |
| static int cafe_vidioc_streamon(struct file *filp, void *priv, |
| enum v4l2_buf_type type) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| int ret = -EINVAL; |
| |
| if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE) |
| goto out; |
| mutex_lock(&cam->s_mutex); |
| if (cam->state != S_IDLE || cam->n_sbufs == 0) |
| goto out_unlock; |
| |
| cam->sequence = 0; |
| ret = cafe_read_setup(cam, S_STREAMING); |
| |
| out_unlock: |
| mutex_unlock(&cam->s_mutex); |
| out: |
| return ret; |
| } |
| |
| |
| static int cafe_vidioc_streamoff(struct file *filp, void *priv, |
| enum v4l2_buf_type type) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| int ret = -EINVAL; |
| |
| if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE) |
| goto out; |
| mutex_lock(&cam->s_mutex); |
| if (cam->state != S_STREAMING) |
| goto out_unlock; |
| |
| cafe_ctlr_stop_dma(cam); |
| ret = 0; |
| |
| out_unlock: |
| mutex_unlock(&cam->s_mutex); |
| out: |
| return ret; |
| } |
| |
| |
| |
| static int cafe_setup_siobuf(struct cafe_camera *cam, int index) |
| { |
| struct cafe_sio_buffer *buf = cam->sb_bufs + index; |
| |
| INIT_LIST_HEAD(&buf->list); |
| buf->v4lbuf.length = PAGE_ALIGN(cam->pix_format.sizeimage); |
| buf->buffer = vmalloc_user(buf->v4lbuf.length); |
| if (buf->buffer == NULL) |
| return -ENOMEM; |
| buf->mapcount = 0; |
| buf->cam = cam; |
| |
| buf->v4lbuf.index = index; |
| buf->v4lbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| buf->v4lbuf.field = V4L2_FIELD_NONE; |
| buf->v4lbuf.memory = V4L2_MEMORY_MMAP; |
| /* |
| * Offset: must be 32-bit even on a 64-bit system. videobuf-dma-sg |
| * just uses the length times the index, but the spec warns |
| * against doing just that - vma merging problems. So we |
| * leave a gap between each pair of buffers. |
| */ |
| buf->v4lbuf.m.offset = 2*index*buf->v4lbuf.length; |
| return 0; |
| } |
| |
| static int cafe_free_sio_buffers(struct cafe_camera *cam) |
| { |
| int i; |
| |
| /* |
| * If any buffers are mapped, we cannot free them at all. |
| */ |
| for (i = 0; i < cam->n_sbufs; i++) |
| if (cam->sb_bufs[i].mapcount > 0) |
| return -EBUSY; |
| /* |
| * OK, let's do it. |
| */ |
| for (i = 0; i < cam->n_sbufs; i++) |
| vfree(cam->sb_bufs[i].buffer); |
| cam->n_sbufs = 0; |
| kfree(cam->sb_bufs); |
| cam->sb_bufs = NULL; |
| INIT_LIST_HEAD(&cam->sb_avail); |
| INIT_LIST_HEAD(&cam->sb_full); |
| return 0; |
| } |
| |
| |
| |
| static int cafe_vidioc_reqbufs(struct file *filp, void *priv, |
| struct v4l2_requestbuffers *req) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| int ret = 0; /* Silence warning */ |
| |
| /* |
| * Make sure it's something we can do. User pointers could be |
| * implemented without great pain, but that's not been done yet. |
| */ |
| if (req->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) |
| return -EINVAL; |
| if (req->memory != V4L2_MEMORY_MMAP) |
| return -EINVAL; |
| /* |
| * If they ask for zero buffers, they really want us to stop streaming |
| * (if it's happening) and free everything. Should we check owner? |
| */ |
| mutex_lock(&cam->s_mutex); |
| if (req->count == 0) { |
| if (cam->state == S_STREAMING) |
| cafe_ctlr_stop_dma(cam); |
| ret = cafe_free_sio_buffers (cam); |
| goto out; |
| } |
| /* |
| * Device needs to be idle and working. We *could* try to do the |
| * right thing in S_SPECREAD by shutting things down, but it |
| * probably doesn't matter. |
| */ |
| if (cam->state != S_IDLE || (cam->owner && cam->owner != filp)) { |
| ret = -EBUSY; |
| goto out; |
| } |
| cam->owner = filp; |
| |
| if (req->count < min_buffers) |
| req->count = min_buffers; |
| else if (req->count > max_buffers) |
| req->count = max_buffers; |
| if (cam->n_sbufs > 0) { |
| ret = cafe_free_sio_buffers(cam); |
| if (ret) |
| goto out; |
| } |
| |
| cam->sb_bufs = kzalloc(req->count*sizeof(struct cafe_sio_buffer), |
| GFP_KERNEL); |
| if (cam->sb_bufs == NULL) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| for (cam->n_sbufs = 0; cam->n_sbufs < req->count; (cam->n_sbufs++)) { |
| ret = cafe_setup_siobuf(cam, cam->n_sbufs); |
| if (ret) |
| break; |
| } |
| |
| if (cam->n_sbufs == 0) /* no luck at all - ret already set */ |
| kfree(cam->sb_bufs); |
| req->count = cam->n_sbufs; /* In case of partial success */ |
| |
| out: |
| mutex_unlock(&cam->s_mutex); |
| return ret; |
| } |
| |
| |
| static int cafe_vidioc_querybuf(struct file *filp, void *priv, |
| struct v4l2_buffer *buf) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| int ret = -EINVAL; |
| |
| mutex_lock(&cam->s_mutex); |
| if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) |
| goto out; |
| if (buf->index < 0 || buf->index >= cam->n_sbufs) |
| goto out; |
| *buf = cam->sb_bufs[buf->index].v4lbuf; |
| ret = 0; |
| out: |
| mutex_unlock(&cam->s_mutex); |
| return ret; |
| } |
| |
| static int cafe_vidioc_qbuf(struct file *filp, void *priv, |
| struct v4l2_buffer *buf) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| struct cafe_sio_buffer *sbuf; |
| int ret = -EINVAL; |
| unsigned long flags; |
| |
| mutex_lock(&cam->s_mutex); |
| if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) |
| goto out; |
| if (buf->index < 0 || buf->index >= cam->n_sbufs) |
| goto out; |
| sbuf = cam->sb_bufs + buf->index; |
| if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_QUEUED) { |
| ret = 0; /* Already queued?? */ |
| goto out; |
| } |
| if (sbuf->v4lbuf.flags & V4L2_BUF_FLAG_DONE) { |
| /* Spec doesn't say anything, seems appropriate tho */ |
| ret = -EBUSY; |
| goto out; |
| } |
| sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_QUEUED; |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| list_add(&sbuf->list, &cam->sb_avail); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| ret = 0; |
| out: |
| mutex_unlock(&cam->s_mutex); |
| return ret; |
| } |
| |
| static int cafe_vidioc_dqbuf(struct file *filp, void *priv, |
| struct v4l2_buffer *buf) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| struct cafe_sio_buffer *sbuf; |
| int ret = -EINVAL; |
| unsigned long flags; |
| |
| mutex_lock(&cam->s_mutex); |
| if (buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) |
| goto out_unlock; |
| if (cam->state != S_STREAMING) |
| goto out_unlock; |
| if (list_empty(&cam->sb_full) && filp->f_flags & O_NONBLOCK) { |
| ret = -EAGAIN; |
| goto out_unlock; |
| } |
| |
| while (list_empty(&cam->sb_full) && cam->state == S_STREAMING) { |
| mutex_unlock(&cam->s_mutex); |
| if (wait_event_interruptible(cam->iowait, |
| !list_empty(&cam->sb_full))) { |
| ret = -ERESTARTSYS; |
| goto out; |
| } |
| mutex_lock(&cam->s_mutex); |
| } |
| |
| if (cam->state != S_STREAMING) |
| ret = -EINTR; |
| else { |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| /* Should probably recheck !list_empty() here */ |
| sbuf = list_entry(cam->sb_full.next, |
| struct cafe_sio_buffer, list); |
| list_del_init(&sbuf->list); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_DONE; |
| *buf = sbuf->v4lbuf; |
| ret = 0; |
| } |
| |
| out_unlock: |
| mutex_unlock(&cam->s_mutex); |
| out: |
| return ret; |
| } |
| |
| |
| |
| static void cafe_v4l_vm_open(struct vm_area_struct *vma) |
| { |
| struct cafe_sio_buffer *sbuf = vma->vm_private_data; |
| /* |
| * Locking: done under mmap_sem, so we don't need to |
| * go back to the camera lock here. |
| */ |
| sbuf->mapcount++; |
| } |
| |
| |
| static void cafe_v4l_vm_close(struct vm_area_struct *vma) |
| { |
| struct cafe_sio_buffer *sbuf = vma->vm_private_data; |
| |
| mutex_lock(&sbuf->cam->s_mutex); |
| sbuf->mapcount--; |
| /* Docs say we should stop I/O too... */ |
| if (sbuf->mapcount == 0) |
| sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_MAPPED; |
| mutex_unlock(&sbuf->cam->s_mutex); |
| } |
| |
| static struct vm_operations_struct cafe_v4l_vm_ops = { |
| .open = cafe_v4l_vm_open, |
| .close = cafe_v4l_vm_close |
| }; |
| |
| |
| static int cafe_v4l_mmap(struct file *filp, struct vm_area_struct *vma) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; |
| int ret = -EINVAL; |
| int i; |
| struct cafe_sio_buffer *sbuf = NULL; |
| |
| if (! (vma->vm_flags & VM_WRITE) || ! (vma->vm_flags & VM_SHARED)) |
| return -EINVAL; |
| /* |
| * Find the buffer they are looking for. |
| */ |
| mutex_lock(&cam->s_mutex); |
| for (i = 0; i < cam->n_sbufs; i++) |
| if (cam->sb_bufs[i].v4lbuf.m.offset == offset) { |
| sbuf = cam->sb_bufs + i; |
| break; |
| } |
| if (sbuf == NULL) |
| goto out; |
| |
| ret = remap_vmalloc_range(vma, sbuf->buffer, 0); |
| if (ret) |
| goto out; |
| vma->vm_flags |= VM_DONTEXPAND; |
| vma->vm_private_data = sbuf; |
| vma->vm_ops = &cafe_v4l_vm_ops; |
| sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_MAPPED; |
| cafe_v4l_vm_open(vma); |
| ret = 0; |
| out: |
| mutex_unlock(&cam->s_mutex); |
| return ret; |
| } |
| |
| |
| |
| static int cafe_v4l_open(struct inode *inode, struct file *filp) |
| { |
| struct cafe_camera *cam; |
| |
| lock_kernel(); |
| cam = cafe_find_dev(iminor(inode)); |
| if (cam == NULL) { |
| unlock_kernel(); |
| return -ENODEV; |
| } |
| filp->private_data = cam; |
| |
| mutex_lock(&cam->s_mutex); |
| if (cam->users == 0) { |
| cafe_ctlr_power_up(cam); |
| __cafe_cam_reset(cam); |
| cafe_set_config_needed(cam, 1); |
| /* FIXME make sure this is complete */ |
| } |
| (cam->users)++; |
| mutex_unlock(&cam->s_mutex); |
| unlock_kernel(); |
| return 0; |
| } |
| |
| |
| static int cafe_v4l_release(struct inode *inode, struct file *filp) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| |
| mutex_lock(&cam->s_mutex); |
| (cam->users)--; |
| if (filp == cam->owner) { |
| cafe_ctlr_stop_dma(cam); |
| cafe_free_sio_buffers(cam); |
| cam->owner = NULL; |
| } |
| if (cam->users == 0) { |
| cafe_ctlr_power_down(cam); |
| if (alloc_bufs_at_read) |
| cafe_free_dma_bufs(cam); |
| } |
| mutex_unlock(&cam->s_mutex); |
| return 0; |
| } |
| |
| |
| |
| static unsigned int cafe_v4l_poll(struct file *filp, |
| struct poll_table_struct *pt) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| |
| poll_wait(filp, &cam->iowait, pt); |
| if (cam->next_buf >= 0) |
| return POLLIN | POLLRDNORM; |
| return 0; |
| } |
| |
| |
| |
| static int cafe_vidioc_queryctrl(struct file *filp, void *priv, |
| struct v4l2_queryctrl *qc) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| int ret; |
| |
| mutex_lock(&cam->s_mutex); |
| ret = __cafe_cam_cmd(cam, VIDIOC_QUERYCTRL, qc); |
| mutex_unlock(&cam->s_mutex); |
| return ret; |
| } |
| |
| |
| static int cafe_vidioc_g_ctrl(struct file *filp, void *priv, |
| struct v4l2_control *ctrl) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| int ret; |
| |
| mutex_lock(&cam->s_mutex); |
| ret = __cafe_cam_cmd(cam, VIDIOC_G_CTRL, ctrl); |
| mutex_unlock(&cam->s_mutex); |
| return ret; |
| } |
| |
| |
| static int cafe_vidioc_s_ctrl(struct file *filp, void *priv, |
| struct v4l2_control *ctrl) |
| { |
| struct cafe_camera *cam = filp->private_data; |
| int ret; |
| |
| mutex_lock(&cam->s_mutex); |
| ret = __cafe_cam_cmd(cam, VIDIOC_S_CTRL, ctrl); |
| mutex_unlock(&cam->s_mutex); |
| return ret; |
| } |
| |
| |
| |
| |
| |
| static int cafe_vidioc_querycap(struct file *file, void *priv, |
| struct v4l2_capability *cap) |
| { |
| strcpy(cap->driver, "cafe_ccic"); |
| strcpy(cap->card, "cafe_ccic"); |
| cap->version = CAFE_VERSION; |
| cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | |
| V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; |
| return 0; |
| } |
| |
| |
| /* |
| * The default format we use until somebody says otherwise. |
| */ |
| static struct v4l2_pix_format cafe_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 int cafe_vidioc_enum_fmt_vid_cap(struct file *filp, |
| void *priv, struct v4l2_fmtdesc *fmt) |
| { |
| struct cafe_camera *cam = priv; |
| int ret; |
| |
| if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) |
| return -EINVAL; |
| mutex_lock(&cam->s_mutex); |
| ret = __cafe_cam_cmd(cam, VIDIOC_ENUM_FMT, fmt); |
| mutex_unlock(&cam->s_mutex); |
| return ret; |
| } |
| |
| |
| static int cafe_vidioc_try_fmt_vid_cap(struct file *filp, void *priv, |
| struct v4l2_format *fmt) |
| { |
| struct cafe_camera *cam = priv; |
| int ret; |
| |
| mutex_lock(&cam->s_mutex); |
| ret = __cafe_cam_cmd(cam, VIDIOC_TRY_FMT, fmt); |
| mutex_unlock(&cam->s_mutex); |
| return ret; |
| } |
| |
| static int cafe_vidioc_s_fmt_vid_cap(struct file *filp, void *priv, |
| struct v4l2_format *fmt) |
| { |
| struct cafe_camera *cam = priv; |
| int ret; |
| |
| /* |
| * Can't do anything if the device is not idle |
| * Also can't if there are streaming buffers in place. |
| */ |
| if (cam->state != S_IDLE || cam->n_sbufs > 0) |
| return -EBUSY; |
| /* |
| * See if the formatting works in principle. |
| */ |
| ret = cafe_vidioc_try_fmt_vid_cap(filp, priv, fmt); |
| if (ret) |
| return ret; |
| /* |
| * Now we start to change things for real, so let's do it |
| * under lock. |
| */ |
| mutex_lock(&cam->s_mutex); |
| cam->pix_format = fmt->fmt.pix; |
| /* |
| * Make sure we have appropriate DMA buffers. |
| */ |
| ret = -ENOMEM; |
| if (cam->nbufs > 0 && cam->dma_buf_size < cam->pix_format.sizeimage) |
| cafe_free_dma_bufs(cam); |
| if (cam->nbufs == 0) { |
| if (cafe_alloc_dma_bufs(cam, 0)) |
| goto out; |
| } |
| /* |
| * It looks like this might work, so let's program the sensor. |
| */ |
| ret = cafe_cam_configure(cam); |
| if (! ret) |
| ret = cafe_ctlr_configure(cam); |
| out: |
| mutex_unlock(&cam->s_mutex); |
| return ret; |
| } |
| |
| /* |
| * Return our stored notion of how the camera is/should be configured. |
| * The V4l2 spec wants us to be smarter, and actually get this from |
| * the camera (and not mess with it at open time). Someday. |
| */ |
| static int cafe_vidioc_g_fmt_vid_cap(struct file *filp, void *priv, |
| struct v4l2_format *f) |
| { |
| struct cafe_camera *cam = priv; |
| |
| f->fmt.pix = cam->pix_format; |
| return 0; |
| } |
| |
| /* |
| * We only have one input - the sensor - so minimize the nonsense here. |
| */ |
| static int cafe_vidioc_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 cafe_vidioc_g_input(struct file *filp, void *priv, unsigned int *i) |
| { |
| *i = 0; |
| return 0; |
| } |
| |
| static int cafe_vidioc_s_input(struct file *filp, void *priv, unsigned int i) |
| { |
| if (i != 0) |
| return -EINVAL; |
| return 0; |
| } |
| |
| /* from vivi.c */ |
| static int cafe_vidioc_s_std(struct file *filp, void *priv, v4l2_std_id *a) |
| { |
| return 0; |
| } |
| |
| /* |
| * G/S_PARM. Most of this is done by the sensor, but we are |
| * the level which controls the number of read buffers. |
| */ |
| static int cafe_vidioc_g_parm(struct file *filp, void *priv, |
| struct v4l2_streamparm *parms) |
| { |
| struct cafe_camera *cam = priv; |
| int ret; |
| |
| mutex_lock(&cam->s_mutex); |
| ret = __cafe_cam_cmd(cam, VIDIOC_G_PARM, parms); |
| mutex_unlock(&cam->s_mutex); |
| parms->parm.capture.readbuffers = n_dma_bufs; |
| return ret; |
| } |
| |
| static int cafe_vidioc_s_parm(struct file *filp, void *priv, |
| struct v4l2_streamparm *parms) |
| { |
| struct cafe_camera *cam = priv; |
| int ret; |
| |
| mutex_lock(&cam->s_mutex); |
| ret = __cafe_cam_cmd(cam, VIDIOC_S_PARM, parms); |
| mutex_unlock(&cam->s_mutex); |
| parms->parm.capture.readbuffers = n_dma_bufs; |
| return ret; |
| } |
| |
| |
| static void cafe_v4l_dev_release(struct video_device *vd) |
| { |
| struct cafe_camera *cam = container_of(vd, struct cafe_camera, v4ldev); |
| |
| kfree(cam); |
| } |
| |
| |
| /* |
| * This template device holds all of those v4l2 methods; we |
| * clone it for specific real devices. |
| */ |
| |
| static const struct file_operations cafe_v4l_fops = { |
| .owner = THIS_MODULE, |
| .open = cafe_v4l_open, |
| .release = cafe_v4l_release, |
| .read = cafe_v4l_read, |
| .poll = cafe_v4l_poll, |
| .mmap = cafe_v4l_mmap, |
| .ioctl = video_ioctl2, |
| .llseek = no_llseek, |
| }; |
| |
| static const struct v4l2_ioctl_ops cafe_v4l_ioctl_ops = { |
| .vidioc_querycap = cafe_vidioc_querycap, |
| .vidioc_enum_fmt_vid_cap = cafe_vidioc_enum_fmt_vid_cap, |
| .vidioc_try_fmt_vid_cap = cafe_vidioc_try_fmt_vid_cap, |
| .vidioc_s_fmt_vid_cap = cafe_vidioc_s_fmt_vid_cap, |
| .vidioc_g_fmt_vid_cap = cafe_vidioc_g_fmt_vid_cap, |
| .vidioc_enum_input = cafe_vidioc_enum_input, |
| .vidioc_g_input = cafe_vidioc_g_input, |
| .vidioc_s_input = cafe_vidioc_s_input, |
| .vidioc_s_std = cafe_vidioc_s_std, |
| .vidioc_reqbufs = cafe_vidioc_reqbufs, |
| .vidioc_querybuf = cafe_vidioc_querybuf, |
| .vidioc_qbuf = cafe_vidioc_qbuf, |
| .vidioc_dqbuf = cafe_vidioc_dqbuf, |
| .vidioc_streamon = cafe_vidioc_streamon, |
| .vidioc_streamoff = cafe_vidioc_streamoff, |
| .vidioc_queryctrl = cafe_vidioc_queryctrl, |
| .vidioc_g_ctrl = cafe_vidioc_g_ctrl, |
| .vidioc_s_ctrl = cafe_vidioc_s_ctrl, |
| .vidioc_g_parm = cafe_vidioc_g_parm, |
| .vidioc_s_parm = cafe_vidioc_s_parm, |
| }; |
| |
| static struct video_device cafe_v4l_template = { |
| .name = "cafe", |
| .minor = -1, /* Get one dynamically */ |
| .tvnorms = V4L2_STD_NTSC_M, |
| .current_norm = V4L2_STD_NTSC_M, /* make mplayer happy */ |
| |
| .fops = &cafe_v4l_fops, |
| .ioctl_ops = &cafe_v4l_ioctl_ops, |
| .release = cafe_v4l_dev_release, |
| }; |
| |
| |
| |
| |
| |
| |
| |
| /* ---------------------------------------------------------------------- */ |
| /* |
| * Interrupt handler stuff |
| */ |
| |
| |
| |
| static void cafe_frame_tasklet(unsigned long data) |
| { |
| struct cafe_camera *cam = (struct cafe_camera *) data; |
| int i; |
| unsigned long flags; |
| struct cafe_sio_buffer *sbuf; |
| |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| for (i = 0; i < cam->nbufs; i++) { |
| int bufno = cam->next_buf; |
| if (bufno < 0) { /* "will never happen" */ |
| cam_err(cam, "No valid bufs in tasklet!\n"); |
| break; |
| } |
| if (++(cam->next_buf) >= cam->nbufs) |
| cam->next_buf = 0; |
| if (! test_bit(bufno, &cam->flags)) |
| continue; |
| if (list_empty(&cam->sb_avail)) |
| break; /* Leave it valid, hope for better later */ |
| clear_bit(bufno, &cam->flags); |
| sbuf = list_entry(cam->sb_avail.next, |
| struct cafe_sio_buffer, list); |
| /* |
| * Drop the lock during the big copy. This *should* be safe... |
| */ |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| memcpy(sbuf->buffer, cam->dma_bufs[bufno], |
| cam->pix_format.sizeimage); |
| sbuf->v4lbuf.bytesused = cam->pix_format.sizeimage; |
| sbuf->v4lbuf.sequence = cam->buf_seq[bufno]; |
| sbuf->v4lbuf.flags &= ~V4L2_BUF_FLAG_QUEUED; |
| sbuf->v4lbuf.flags |= V4L2_BUF_FLAG_DONE; |
| spin_lock_irqsave(&cam->dev_lock, flags); |
| list_move_tail(&sbuf->list, &cam->sb_full); |
| } |
| if (! list_empty(&cam->sb_full)) |
| wake_up(&cam->iowait); |
| spin_unlock_irqrestore(&cam->dev_lock, flags); |
| } |
| |
| |
| |
| static void cafe_frame_complete(struct cafe_camera *cam, int frame) |
| { |
| /* |
| * Basic frame housekeeping. |
| */ |
| if (test_bit(frame, &cam->flags) && printk_ratelimit()) |
| cam_err(cam, "Frame overrun on %d, frames lost\n", frame); |
| set_bit(frame, &cam->flags); |
| clear_bit(CF_DMA_ACTIVE, &cam->flags); |
| if (cam->next_buf < 0) |
| cam->next_buf = frame; |
| cam->buf_seq[frame] = ++(cam->sequence); |
| |
| switch (cam->state) { |
| /* |
| * If in single read mode, try going speculative. |
| */ |
| case S_SINGLEREAD: |
| cam->state = S_SPECREAD; |
| cam->specframes = 0; |
| wake_up(&cam->iowait); |
| break; |
| |
| /* |
| * If we are already doing speculative reads, and nobody is |
| * reading them, just stop. |
| */ |
| case S_SPECREAD: |
| if (++(cam->specframes) >= cam->nbufs) { |
| cafe_ctlr_stop(cam); |
| cafe_ctlr_irq_disable(cam); |
| cam->state = S_IDLE; |
| } |
| wake_up(&cam->iowait); |
| break; |
| /* |
| * For the streaming case, we defer the real work to the |
| * camera tasklet. |
| * |
| * FIXME: if the application is not consuming the buffers, |
| * we should eventually put things on hold and restart in |
| * vidioc_dqbuf(). |
| */ |
| case S_STREAMING: |
| tasklet_schedule(&cam->s_tasklet); |
| break; |
| |
| default: |
| cam_err(cam, "Frame interrupt in non-operational state\n"); |
| break; |
| } |
| } |
| |
| |
| |
| |
| static void cafe_frame_irq(struct cafe_camera *cam, unsigned int irqs) |
| { |
| unsigned int frame; |
| |
| cafe_reg_write(cam, REG_IRQSTAT, FRAMEIRQS); /* Clear'em all */ |
| /* |
| * Handle any frame completions. There really should |
| * not be more than one of these, or we have fallen |
| * far behind. |
| */ |
| for (frame = 0; frame < cam->nbufs; frame++) |
| if (irqs & (IRQ_EOF0 << frame)) |
| cafe_frame_complete(cam, frame); |
| /* |
| * If a frame starts, note that we have DMA active. This |
| * code assumes that we won't get multiple frame interrupts |
| * at once; may want to rethink that. |
| */ |
| if (irqs & (IRQ_SOF0 | IRQ_SOF1 | IRQ_SOF2)) |
| set_bit(CF_DMA_ACTIVE, &cam->flags); |
| } |
| |
| |
| |
| static irqreturn_t cafe_irq(int irq, void *data) |
| { |
| struct cafe_camera *cam = data; |
| unsigned int irqs; |
| |
| spin_lock(&cam->dev_lock); |
| irqs = cafe_reg_read(cam, REG_IRQSTAT); |
| if ((irqs & ALLIRQS) == 0) { |
| spin_unlock(&cam->dev_lock); |
| return IRQ_NONE; |
| } |
| if (irqs & FRAMEIRQS) |
| cafe_frame_irq(cam, irqs); |
| if (irqs & TWSIIRQS) { |
| cafe_reg_write(cam, REG_IRQSTAT, TWSIIRQS); |
| wake_up(&cam->smbus_wait); |
| } |
| spin_unlock(&cam->dev_lock); |
| return IRQ_HANDLED; |
| } |
| |
| |
| /* -------------------------------------------------------------------------- */ |
| #ifdef CONFIG_VIDEO_ADV_DEBUG |
| /* |
| * Debugfs stuff. |
| */ |
| |
| static char cafe_debug_buf[1024]; |
| static struct dentry *cafe_dfs_root; |
| |
| static void cafe_dfs_setup(void) |
| { |
| cafe_dfs_root = debugfs_create_dir("cafe_ccic", NULL); |
| if (IS_ERR(cafe_dfs_root)) { |
| cafe_dfs_root = NULL; /* Never mind */ |
| printk(KERN_NOTICE "cafe_ccic unable to set up debugfs\n"); |
| } |
| } |
| |
| static void cafe_dfs_shutdown(void) |
| { |
| if (cafe_dfs_root) |
| debugfs_remove(cafe_dfs_root); |
| } |
| |
| static int cafe_dfs_open(struct inode *inode, struct file *file) |
| { |
| file->private_data = inode->i_private; |
| return 0; |
| } |
| |
| static ssize_t cafe_dfs_read_regs(struct file *file, |
| char __user *buf, size_t count, loff_t *ppos) |
| { |
| struct cafe_camera *cam = file->private_data; |
| char *s = cafe_debug_buf; |
| int offset; |
| |
| for (offset = 0; offset < 0x44; offset += 4) |
| s += sprintf(s, "%02x: %08x\n", offset, |
| cafe_reg_read(cam, offset)); |
| for (offset = 0x88; offset <= 0x90; offset += 4) |
| s += sprintf(s, "%02x: %08x\n", offset, |
| cafe_reg_read(cam, offset)); |
| for (offset = 0xb4; offset <= 0xbc; offset += 4) |
| s += sprintf(s, "%02x: %08x\n", offset, |
| cafe_reg_read(cam, offset)); |
| for (offset = 0x3000; offset <= 0x300c; offset += 4) |
| s += sprintf(s, "%04x: %08x\n", offset, |
| cafe_reg_read(cam, offset)); |
| return simple_read_from_buffer(buf, count, ppos, cafe_debug_buf, |
| s - cafe_debug_buf); |
| } |
| |
| static const struct file_operations cafe_dfs_reg_ops = { |
| .owner = THIS_MODULE, |
| .read = cafe_dfs_read_regs, |
| .open = cafe_dfs_open |
| }; |
| |
| static ssize_t cafe_dfs_read_cam(struct file *file, |
| char __user *buf, size_t count, loff_t *ppos) |
| { |
| struct cafe_camera *cam = file->private_data; |
| char *s = cafe_debug_buf; |
| int offset; |
| |
| if (! cam->sensor) |
| return -EINVAL; |
| for (offset = 0x0; offset < 0x8a; offset++) |
| { |
| u8 v; |
| |
| cafe_smbus_read_data(cam, cam->sensor->addr, offset, &v); |
| s += sprintf(s, "%02x: %02x\n", offset, v); |
| } |
| return simple_read_from_buffer(buf, count, ppos, cafe_debug_buf, |
| s - cafe_debug_buf); |
| } |
| |
| static const struct file_operations cafe_dfs_cam_ops = { |
| .owner = THIS_MODULE, |
| .read = cafe_dfs_read_cam, |
| .open = cafe_dfs_open |
| }; |
| |
| |
| |
| static void cafe_dfs_cam_setup(struct cafe_camera *cam) |
| { |
| char fname[40]; |
| |
| if (!cafe_dfs_root) |
| return; |
| sprintf(fname, "regs-%d", cam->v4ldev.minor); |
| cam->dfs_regs = debugfs_create_file(fname, 0444, cafe_dfs_root, |
| cam, &cafe_dfs_reg_ops); |
| sprintf(fname, "cam-%d", cam->v4ldev.minor); |
| cam->dfs_cam_regs = debugfs_create_file(fname, 0444, cafe_dfs_root, |
| cam, &cafe_dfs_cam_ops); |
| } |
| |
| |
| static void cafe_dfs_cam_shutdown(struct cafe_camera *cam) |
| { |
| if (! IS_ERR(cam->dfs_regs)) |
| debugfs_remove(cam->dfs_regs); |
| if (! IS_ERR(cam->dfs_cam_regs)) |
| debugfs_remove(cam->dfs_cam_regs); |
| } |
| |
| #else |
| |
| #define cafe_dfs_setup() |
| #define cafe_dfs_shutdown() |
| #define cafe_dfs_cam_setup(cam) |
| #define cafe_dfs_cam_shutdown(cam) |
| #endif /* CONFIG_VIDEO_ADV_DEBUG */ |
| |
| |
| |
| |
| /* ------------------------------------------------------------------------*/ |
| /* |
| * PCI interface stuff. |
| */ |
| |
| static int cafe_pci_probe(struct pci_dev *pdev, |
| const struct pci_device_id *id) |
| { |
| int ret; |
| u16 classword; |
| struct cafe_camera *cam; |
| /* |
| * Make sure we have a camera here - we'll get calls for |
| * the other cafe devices as well. |
| */ |
| pci_read_config_word(pdev, PCI_CLASS_DEVICE, &classword); |
| if (classword != PCI_CLASS_MULTIMEDIA_VIDEO) |
| return -ENODEV; |
| /* |
| * Start putting together one of our big camera structures. |
| */ |
| ret = -ENOMEM; |
| cam = kzalloc(sizeof(struct cafe_camera), GFP_KERNEL); |
| if (cam == NULL) |
| goto out; |
| mutex_init(&cam->s_mutex); |
| mutex_lock(&cam->s_mutex); |
| spin_lock_init(&cam->dev_lock); |
| cam->state = S_NOTREADY; |
| cafe_set_config_needed(cam, 1); |
| init_waitqueue_head(&cam->smbus_wait); |
| init_waitqueue_head(&cam->iowait); |
| cam->pdev = pdev; |
| cam->pix_format = cafe_def_pix_format; |
| INIT_LIST_HEAD(&cam->dev_list); |
| INIT_LIST_HEAD(&cam->sb_avail); |
| INIT_LIST_HEAD(&cam->sb_full); |
| tasklet_init(&cam->s_tasklet, cafe_frame_tasklet, (unsigned long) cam); |
| /* |
| * Get set up on the PCI bus. |
| */ |
| ret = pci_enable_device(pdev); |
| if (ret) |
| goto out_free; |
| pci_set_master(pdev); |
| |
| ret = -EIO; |
| cam->regs = pci_iomap(pdev, 0, 0); |
| if (! cam->regs) { |
| printk(KERN_ERR "Unable to ioremap cafe-ccic regs\n"); |
| goto out_free; |
| } |
| ret = request_irq(pdev->irq, cafe_irq, IRQF_SHARED, "cafe-ccic", cam); |
| if (ret) |
| goto out_iounmap; |
| /* |
| * Initialize the controller and leave it powered up. It will |
| * stay that way until the sensor driver shows up. |
| */ |
| cafe_ctlr_init(cam); |
| cafe_ctlr_power_up(cam); |
| /* |
| * Set up I2C/SMBUS communications. We have to drop the mutex here |
| * because the sensor could attach in this call chain, leading to |
| * unsightly deadlocks. |
| */ |
| mutex_unlock(&cam->s_mutex); /* attach can deadlock */ |
| ret = cafe_smbus_setup(cam); |
| if (ret) |
| goto out_freeirq; |
| /* |
| * Get the v4l2 setup done. |
| */ |
| mutex_lock(&cam->s_mutex); |
| cam->v4ldev = cafe_v4l_template; |
| cam->v4ldev.debug = 0; |
| // cam->v4ldev.debug = V4L2_DEBUG_IOCTL_ARG; |
| cam->v4ldev.parent = &pdev->dev; |
| ret = video_register_device(&cam->v4ldev, VFL_TYPE_GRABBER, -1); |
| if (ret) |
| goto out_smbus; |
| /* |
| * If so requested, try to get our DMA buffers now. |
| */ |
| if (!alloc_bufs_at_read) { |
| if (cafe_alloc_dma_bufs(cam, 1)) |
| cam_warn(cam, "Unable to alloc DMA buffers at load" |
| " will try again later."); |
| } |
| |
| cafe_dfs_cam_setup(cam); |
| mutex_unlock(&cam->s_mutex); |
| cafe_add_dev(cam); |
| return 0; |
| |
| out_smbus: |
| cafe_smbus_shutdown(cam); |
| out_freeirq: |
| cafe_ctlr_power_down(cam); |
| free_irq(pdev->irq, cam); |
| out_iounmap: |
| pci_iounmap(pdev, cam->regs); |
| out_free: |
| kfree(cam); |
| out: |
| return ret; |
| } |
| |
| |
| /* |
| * Shut down an initialized device |
| */ |
| static void cafe_shutdown(struct cafe_camera *cam) |
| { |
| /* FIXME: Make sure we take care of everything here */ |
| cafe_dfs_cam_shutdown(cam); |
| if (cam->n_sbufs > 0) |
| /* What if they are still mapped? Shouldn't be, but... */ |
| cafe_free_sio_buffers(cam); |
| cafe_remove_dev(cam); |
| cafe_ctlr_stop_dma(cam); |
| cafe_ctlr_power_down(cam); |
| cafe_smbus_shutdown(cam); |
| cafe_free_dma_bufs(cam); |
| free_irq(cam->pdev->irq, cam); |
| pci_iounmap(cam->pdev, cam->regs); |
| video_unregister_device(&cam->v4ldev); |
| /* kfree(cam); done in v4l_release () */ |
| } |
| |
| |
| static void cafe_pci_remove(struct pci_dev *pdev) |
| { |
| struct cafe_camera *cam = cafe_find_by_pdev(pdev); |
| |
| if (cam == NULL) { |
| printk(KERN_WARNING "pci_remove on unknown pdev %p\n", pdev); |
| return; |
| } |
| mutex_lock(&cam->s_mutex); |
| if (cam->users > 0) |
| cam_warn(cam, "Removing a device with users!\n"); |
| cafe_shutdown(cam); |
| /* No unlock - it no longer exists */ |
| } |
| |
| |
| #ifdef CONFIG_PM |
| /* |
| * Basic power management. |
| */ |
| static int cafe_pci_suspend(struct pci_dev *pdev, pm_message_t state) |
| { |
| struct cafe_camera *cam = cafe_find_by_pdev(pdev); |
| int ret; |
| enum cafe_state cstate; |
| |
| ret = pci_save_state(pdev); |
| if (ret) |
| return ret; |
| cstate = cam->state; /* HACK - stop_dma sets to idle */ |
| cafe_ctlr_stop_dma(cam); |
| cafe_ctlr_power_down(cam); |
| pci_disable_device(pdev); |
| cam->state = cstate; |
| return 0; |
| } |
| |
| |
| static int cafe_pci_resume(struct pci_dev *pdev) |
| { |
| struct cafe_camera *cam = cafe_find_by_pdev(pdev); |
| int ret = 0; |
| |
| ret = pci_restore_state(pdev); |
| if (ret) |
| return ret; |
| ret = pci_enable_device(pdev); |
| |
| if (ret) { |
| cam_warn(cam, "Unable to re-enable device on resume!\n"); |
| return ret; |
| } |
| cafe_ctlr_init(cam); |
| cafe_ctlr_power_down(cam); |
| |
| mutex_lock(&cam->s_mutex); |
| if (cam->users > 0) { |
| cafe_ctlr_power_up(cam); |
| __cafe_cam_reset(cam); |
| } |
| mutex_unlock(&cam->s_mutex); |
| |
| set_bit(CF_CONFIG_NEEDED, &cam->flags); |
| if (cam->state == S_SPECREAD) |
| cam->state = S_IDLE; /* Don't bother restarting */ |
| else if (cam->state == S_SINGLEREAD || cam->state == S_STREAMING) |
| ret = cafe_read_setup(cam, cam->state); |
| return ret; |
| } |
| |
| #endif /* CONFIG_PM */ |
| |
| |
| static struct pci_device_id cafe_ids[] = { |
| { PCI_DEVICE(0x11ab, 0x4100) }, /* Eventual real ID */ |
| { PCI_DEVICE(0x11ab, 0x4102) }, /* Really eventual real ID */ |
| { 0, } |
| }; |
| |
| MODULE_DEVICE_TABLE(pci, cafe_ids); |
| |
| static struct pci_driver cafe_pci_driver = { |
| .name = "cafe1000-ccic", |
| .id_table = cafe_ids, |
| .probe = cafe_pci_probe, |
| .remove = cafe_pci_remove, |
| #ifdef CONFIG_PM |
| .suspend = cafe_pci_suspend, |
| .resume = cafe_pci_resume, |
| #endif |
| }; |
| |
| |
| |
| |
| static int __init cafe_init(void) |
| { |
| int ret; |
| |
| printk(KERN_NOTICE "Marvell M88ALP01 'CAFE' Camera Controller version %d\n", |
| CAFE_VERSION); |
| cafe_dfs_setup(); |
| ret = pci_register_driver(&cafe_pci_driver); |
| if (ret) { |
| printk(KERN_ERR "Unable to register cafe_ccic driver\n"); |
| goto out; |
| } |
| request_module("ov7670"); /* FIXME want something more general */ |
| ret = 0; |
| |
| out: |
| return ret; |
| } |
| |
| |
| static void __exit cafe_exit(void) |
| { |
| pci_unregister_driver(&cafe_pci_driver); |
| cafe_dfs_shutdown(); |
| } |
| |
| module_init(cafe_init); |
| module_exit(cafe_exit); |