Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 1 | /* |
| 2 | * Driver for the VIA Chrome integrated camera controller. |
| 3 | * |
| 4 | * Copyright 2009,2010 Jonathan Corbet <corbet@lwn.net> |
| 5 | * Distributable under the terms of the GNU General Public License, version 2 |
| 6 | * |
| 7 | * This work was supported by the One Laptop Per Child project |
| 8 | */ |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/device.h> |
| 12 | #include <linux/list.h> |
| 13 | #include <linux/pci.h> |
| 14 | #include <linux/gpio.h> |
| 15 | #include <linux/interrupt.h> |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 16 | #include <linux/platform_device.h> |
| 17 | #include <linux/videodev2.h> |
| 18 | #include <media/v4l2-device.h> |
| 19 | #include <media/v4l2-ioctl.h> |
| 20 | #include <media/v4l2-chip-ident.h> |
Daniel Drake | a39fbb1 | 2012-04-30 18:06:27 -0300 | [diff] [blame] | 21 | #include <media/ov7670.h> |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 22 | #include <media/videobuf-dma-sg.h> |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 23 | #include <linux/delay.h> |
| 24 | #include <linux/dma-mapping.h> |
Jean Pihet | e8db0be | 2011-08-25 15:35:03 +0200 | [diff] [blame] | 25 | #include <linux/pm_qos.h> |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 26 | #include <linux/via-core.h> |
| 27 | #include <linux/via-gpio.h> |
| 28 | #include <linux/via_i2c.h> |
Daniel Drake | c6384c8 | 2011-03-03 16:03:31 -0300 | [diff] [blame] | 29 | #include <asm/olpc.h> |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 30 | |
| 31 | #include "via-camera.h" |
| 32 | |
Daniel Drake | 027e99a | 2011-04-29 18:45:01 -0300 | [diff] [blame] | 33 | MODULE_ALIAS("platform:viafb-camera"); |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 34 | MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>"); |
| 35 | MODULE_DESCRIPTION("VIA framebuffer-based camera controller driver"); |
| 36 | MODULE_LICENSE("GPL"); |
| 37 | |
Rusty Russell | 90ab5ee | 2012-01-13 09:32:20 +1030 | [diff] [blame] | 38 | static bool flip_image; |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 39 | module_param(flip_image, bool, 0444); |
| 40 | MODULE_PARM_DESC(flip_image, |
| 41 | "If set, the sensor will be instructed to flip the image " |
| 42 | "vertically."); |
| 43 | |
Rusty Russell | 90ab5ee | 2012-01-13 09:32:20 +1030 | [diff] [blame] | 44 | static bool override_serial; |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 45 | module_param(override_serial, bool, 0444); |
| 46 | MODULE_PARM_DESC(override_serial, |
| 47 | "The camera driver will normally refuse to load if " |
| 48 | "the XO 1.5 serial port is enabled. Set this option " |
Daniel Drake | c6384c8 | 2011-03-03 16:03:31 -0300 | [diff] [blame] | 49 | "to force-enable the camera."); |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 50 | |
| 51 | /* |
| 52 | * Basic window sizes. |
| 53 | */ |
| 54 | #define VGA_WIDTH 640 |
| 55 | #define VGA_HEIGHT 480 |
| 56 | #define QCIF_WIDTH 176 |
| 57 | #define QCIF_HEIGHT 144 |
| 58 | |
| 59 | /* |
| 60 | * The structure describing our camera. |
| 61 | */ |
| 62 | enum viacam_opstate { S_IDLE = 0, S_RUNNING = 1 }; |
| 63 | |
| 64 | struct via_camera { |
| 65 | struct v4l2_device v4l2_dev; |
| 66 | struct video_device vdev; |
| 67 | struct v4l2_subdev *sensor; |
| 68 | struct platform_device *platdev; |
| 69 | struct viafb_dev *viadev; |
| 70 | struct mutex lock; |
| 71 | enum viacam_opstate opstate; |
| 72 | unsigned long flags; |
Jean Pihet | cc74998 | 2011-08-25 15:35:12 +0200 | [diff] [blame] | 73 | struct pm_qos_request qos_request; |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 74 | /* |
| 75 | * GPIO info for power/reset management |
| 76 | */ |
| 77 | int power_gpio; |
| 78 | int reset_gpio; |
| 79 | /* |
| 80 | * I/O memory stuff. |
| 81 | */ |
| 82 | void __iomem *mmio; /* Where the registers live */ |
| 83 | void __iomem *fbmem; /* Frame buffer memory */ |
| 84 | u32 fb_offset; /* Reserved memory offset (FB) */ |
| 85 | /* |
| 86 | * Capture buffers and related. The controller supports |
| 87 | * up to three, so that's what we have here. These buffers |
| 88 | * live in frame buffer memory, so we don't call them "DMA". |
| 89 | */ |
| 90 | unsigned int cb_offsets[3]; /* offsets into fb mem */ |
| 91 | u8 *cb_addrs[3]; /* Kernel-space addresses */ |
| 92 | int n_cap_bufs; /* How many are we using? */ |
| 93 | int next_buf; |
| 94 | struct videobuf_queue vb_queue; |
| 95 | struct list_head buffer_queue; /* prot. by reg_lock */ |
| 96 | /* |
| 97 | * User tracking. |
| 98 | */ |
| 99 | int users; |
| 100 | struct file *owner; |
| 101 | /* |
| 102 | * Video format information. sensor_format is kept in a form |
| 103 | * that we can use to pass to the sensor. We always run the |
| 104 | * sensor in VGA resolution, though, and let the controller |
| 105 | * downscale things if need be. So we keep the "real* |
| 106 | * dimensions separately. |
| 107 | */ |
| 108 | struct v4l2_pix_format sensor_format; |
| 109 | struct v4l2_pix_format user_format; |
| 110 | enum v4l2_mbus_pixelcode mbus_code; |
| 111 | }; |
| 112 | |
| 113 | /* |
| 114 | * Yes, this is a hack, but there's only going to be one of these |
| 115 | * on any system we know of. |
| 116 | */ |
| 117 | static struct via_camera *via_cam_info; |
| 118 | |
| 119 | /* |
| 120 | * Flag values, manipulated with bitops |
| 121 | */ |
| 122 | #define CF_DMA_ACTIVE 0 /* A frame is incoming */ |
| 123 | #define CF_CONFIG_NEEDED 1 /* Must configure hardware */ |
| 124 | |
| 125 | |
| 126 | /* |
| 127 | * Nasty ugly v4l2 boilerplate. |
| 128 | */ |
| 129 | #define sensor_call(cam, optype, func, args...) \ |
| 130 | v4l2_subdev_call(cam->sensor, optype, func, ##args) |
| 131 | |
| 132 | /* |
| 133 | * Debugging and related. |
| 134 | */ |
| 135 | #define cam_err(cam, fmt, arg...) \ |
| 136 | dev_err(&(cam)->platdev->dev, fmt, ##arg); |
| 137 | #define cam_warn(cam, fmt, arg...) \ |
| 138 | dev_warn(&(cam)->platdev->dev, fmt, ##arg); |
| 139 | #define cam_dbg(cam, fmt, arg...) \ |
| 140 | dev_dbg(&(cam)->platdev->dev, fmt, ##arg); |
| 141 | |
| 142 | /* |
| 143 | * Format handling. This is ripped almost directly from Hans's changes |
| 144 | * to cafe_ccic.c. It's a little unfortunate; until this change, we |
| 145 | * didn't need to know anything about the format except its byte depth; |
| 146 | * now this information must be managed at this level too. |
| 147 | */ |
| 148 | static struct via_format { |
| 149 | __u8 *desc; |
| 150 | __u32 pixelformat; |
| 151 | int bpp; /* Bytes per pixel */ |
| 152 | enum v4l2_mbus_pixelcode mbus_code; |
| 153 | } via_formats[] = { |
| 154 | { |
| 155 | .desc = "YUYV 4:2:2", |
| 156 | .pixelformat = V4L2_PIX_FMT_YUYV, |
| 157 | .mbus_code = V4L2_MBUS_FMT_YUYV8_2X8, |
| 158 | .bpp = 2, |
| 159 | }, |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 160 | /* RGB444 and Bayer should be doable, but have never been |
Daniel Drake | 9c900f0 | 2011-10-26 09:16:50 -0300 | [diff] [blame] | 161 | tested with this driver. RGB565 seems to work at the default |
| 162 | resolution, but results in color corruption when being scaled by |
| 163 | viacam_set_scaled(), and is disabled as a result. */ |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 164 | }; |
| 165 | #define N_VIA_FMTS ARRAY_SIZE(via_formats) |
| 166 | |
| 167 | static struct via_format *via_find_format(u32 pixelformat) |
| 168 | { |
| 169 | unsigned i; |
| 170 | |
| 171 | for (i = 0; i < N_VIA_FMTS; i++) |
| 172 | if (via_formats[i].pixelformat == pixelformat) |
| 173 | return via_formats + i; |
| 174 | /* Not found? Then return the first format. */ |
| 175 | return via_formats; |
| 176 | } |
| 177 | |
| 178 | |
| 179 | /*--------------------------------------------------------------------------*/ |
| 180 | /* |
| 181 | * Sensor power/reset management. This piece is OLPC-specific for |
| 182 | * sure; other configurations will have things connected differently. |
| 183 | */ |
| 184 | static int via_sensor_power_setup(struct via_camera *cam) |
| 185 | { |
| 186 | int ret; |
| 187 | |
| 188 | cam->power_gpio = viafb_gpio_lookup("VGPIO3"); |
| 189 | cam->reset_gpio = viafb_gpio_lookup("VGPIO2"); |
| 190 | if (cam->power_gpio < 0 || cam->reset_gpio < 0) { |
| 191 | dev_err(&cam->platdev->dev, "Unable to find GPIO lines\n"); |
| 192 | return -EINVAL; |
| 193 | } |
| 194 | ret = gpio_request(cam->power_gpio, "viafb-camera"); |
| 195 | if (ret) { |
| 196 | dev_err(&cam->platdev->dev, "Unable to request power GPIO\n"); |
| 197 | return ret; |
| 198 | } |
| 199 | ret = gpio_request(cam->reset_gpio, "viafb-camera"); |
| 200 | if (ret) { |
| 201 | dev_err(&cam->platdev->dev, "Unable to request reset GPIO\n"); |
| 202 | gpio_free(cam->power_gpio); |
| 203 | return ret; |
| 204 | } |
| 205 | gpio_direction_output(cam->power_gpio, 0); |
| 206 | gpio_direction_output(cam->reset_gpio, 0); |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | /* |
| 211 | * Power up the sensor and perform the reset dance. |
| 212 | */ |
| 213 | static void via_sensor_power_up(struct via_camera *cam) |
| 214 | { |
| 215 | gpio_set_value(cam->power_gpio, 1); |
| 216 | gpio_set_value(cam->reset_gpio, 0); |
| 217 | msleep(20); /* Probably excessive */ |
| 218 | gpio_set_value(cam->reset_gpio, 1); |
| 219 | msleep(20); |
| 220 | } |
| 221 | |
| 222 | static void via_sensor_power_down(struct via_camera *cam) |
| 223 | { |
| 224 | gpio_set_value(cam->power_gpio, 0); |
| 225 | gpio_set_value(cam->reset_gpio, 0); |
| 226 | } |
| 227 | |
| 228 | |
| 229 | static void via_sensor_power_release(struct via_camera *cam) |
| 230 | { |
| 231 | via_sensor_power_down(cam); |
| 232 | gpio_free(cam->power_gpio); |
| 233 | gpio_free(cam->reset_gpio); |
| 234 | } |
| 235 | |
| 236 | /* --------------------------------------------------------------------------*/ |
| 237 | /* Sensor ops */ |
| 238 | |
| 239 | /* |
| 240 | * Manage the ov7670 "flip" bit, which needs special help. |
| 241 | */ |
| 242 | static int viacam_set_flip(struct via_camera *cam) |
| 243 | { |
| 244 | struct v4l2_control ctrl; |
| 245 | |
| 246 | memset(&ctrl, 0, sizeof(ctrl)); |
| 247 | ctrl.id = V4L2_CID_VFLIP; |
| 248 | ctrl.value = flip_image; |
| 249 | return sensor_call(cam, core, s_ctrl, &ctrl); |
| 250 | } |
| 251 | |
| 252 | /* |
| 253 | * Configure the sensor. It's up to the caller to ensure |
| 254 | * that the camera is in the correct operating state. |
| 255 | */ |
| 256 | static int viacam_configure_sensor(struct via_camera *cam) |
| 257 | { |
| 258 | struct v4l2_mbus_framefmt mbus_fmt; |
| 259 | int ret; |
| 260 | |
| 261 | v4l2_fill_mbus_format(&mbus_fmt, &cam->sensor_format, cam->mbus_code); |
| 262 | ret = sensor_call(cam, core, init, 0); |
| 263 | if (ret == 0) |
| 264 | ret = sensor_call(cam, video, s_mbus_fmt, &mbus_fmt); |
| 265 | /* |
| 266 | * OV7670 does weird things if flip is set *before* format... |
| 267 | */ |
| 268 | if (ret == 0) |
| 269 | ret = viacam_set_flip(cam); |
| 270 | return ret; |
| 271 | } |
| 272 | |
| 273 | |
| 274 | |
| 275 | /* --------------------------------------------------------------------------*/ |
| 276 | /* |
| 277 | * Some simple register accessors; they assume that the lock is held. |
| 278 | * |
| 279 | * Should we want to support the second capture engine, we could |
| 280 | * hide the register difference by adding 0x1000 to registers in the |
| 281 | * 0x300-350 range. |
| 282 | */ |
| 283 | static inline void viacam_write_reg(struct via_camera *cam, |
| 284 | int reg, int value) |
| 285 | { |
| 286 | iowrite32(value, cam->mmio + reg); |
| 287 | } |
| 288 | |
| 289 | static inline int viacam_read_reg(struct via_camera *cam, int reg) |
| 290 | { |
| 291 | return ioread32(cam->mmio + reg); |
| 292 | } |
| 293 | |
| 294 | static inline void viacam_write_reg_mask(struct via_camera *cam, |
| 295 | int reg, int value, int mask) |
| 296 | { |
| 297 | int tmp = viacam_read_reg(cam, reg); |
| 298 | |
| 299 | tmp = (tmp & ~mask) | (value & mask); |
| 300 | viacam_write_reg(cam, reg, tmp); |
| 301 | } |
| 302 | |
| 303 | |
| 304 | /* --------------------------------------------------------------------------*/ |
| 305 | /* Interrupt management and handling */ |
| 306 | |
| 307 | static irqreturn_t viacam_quick_irq(int irq, void *data) |
| 308 | { |
| 309 | struct via_camera *cam = data; |
| 310 | irqreturn_t ret = IRQ_NONE; |
| 311 | int icv; |
| 312 | |
| 313 | /* |
| 314 | * All we do here is to clear the interrupts and tell |
| 315 | * the handler thread to wake up. |
| 316 | */ |
| 317 | spin_lock(&cam->viadev->reg_lock); |
| 318 | icv = viacam_read_reg(cam, VCR_INTCTRL); |
| 319 | if (icv & VCR_IC_EAV) { |
| 320 | icv |= VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL; |
| 321 | viacam_write_reg(cam, VCR_INTCTRL, icv); |
| 322 | ret = IRQ_WAKE_THREAD; |
| 323 | } |
| 324 | spin_unlock(&cam->viadev->reg_lock); |
| 325 | return ret; |
| 326 | } |
| 327 | |
| 328 | /* |
| 329 | * Find the next videobuf buffer which has somebody waiting on it. |
| 330 | */ |
| 331 | static struct videobuf_buffer *viacam_next_buffer(struct via_camera *cam) |
| 332 | { |
| 333 | unsigned long flags; |
| 334 | struct videobuf_buffer *buf = NULL; |
| 335 | |
| 336 | spin_lock_irqsave(&cam->viadev->reg_lock, flags); |
| 337 | if (cam->opstate != S_RUNNING) |
| 338 | goto out; |
| 339 | if (list_empty(&cam->buffer_queue)) |
| 340 | goto out; |
| 341 | buf = list_entry(cam->buffer_queue.next, struct videobuf_buffer, queue); |
| 342 | if (!waitqueue_active(&buf->done)) {/* Nobody waiting */ |
| 343 | buf = NULL; |
| 344 | goto out; |
| 345 | } |
| 346 | list_del(&buf->queue); |
| 347 | buf->state = VIDEOBUF_ACTIVE; |
| 348 | out: |
| 349 | spin_unlock_irqrestore(&cam->viadev->reg_lock, flags); |
| 350 | return buf; |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * The threaded IRQ handler. |
| 355 | */ |
| 356 | static irqreturn_t viacam_irq(int irq, void *data) |
| 357 | { |
| 358 | int bufn; |
| 359 | struct videobuf_buffer *vb; |
| 360 | struct via_camera *cam = data; |
| 361 | struct videobuf_dmabuf *vdma; |
| 362 | |
| 363 | /* |
| 364 | * If there is no place to put the data frame, don't bother |
| 365 | * with anything else. |
| 366 | */ |
| 367 | vb = viacam_next_buffer(cam); |
| 368 | if (vb == NULL) |
| 369 | goto done; |
| 370 | /* |
| 371 | * Figure out which buffer we just completed. |
| 372 | */ |
| 373 | bufn = (viacam_read_reg(cam, VCR_INTCTRL) & VCR_IC_ACTBUF) >> 3; |
| 374 | bufn -= 1; |
| 375 | if (bufn < 0) |
| 376 | bufn = cam->n_cap_bufs - 1; |
| 377 | /* |
| 378 | * Copy over the data and let any waiters know. |
| 379 | */ |
| 380 | vdma = videobuf_to_dma(vb); |
| 381 | viafb_dma_copy_out_sg(cam->cb_offsets[bufn], vdma->sglist, vdma->sglen); |
| 382 | vb->state = VIDEOBUF_DONE; |
| 383 | vb->size = cam->user_format.sizeimage; |
| 384 | wake_up(&vb->done); |
| 385 | done: |
| 386 | return IRQ_HANDLED; |
| 387 | } |
| 388 | |
| 389 | |
| 390 | /* |
| 391 | * These functions must mess around with the general interrupt |
| 392 | * control register, which is relevant to much more than just the |
| 393 | * camera. Nothing else uses interrupts, though, as of this writing. |
| 394 | * Should that situation change, we'll have to improve support at |
| 395 | * the via-core level. |
| 396 | */ |
| 397 | static void viacam_int_enable(struct via_camera *cam) |
| 398 | { |
| 399 | viacam_write_reg(cam, VCR_INTCTRL, |
| 400 | VCR_IC_INTEN|VCR_IC_EAV|VCR_IC_EVBI|VCR_IC_FFULL); |
| 401 | viafb_irq_enable(VDE_I_C0AVEN); |
| 402 | } |
| 403 | |
| 404 | static void viacam_int_disable(struct via_camera *cam) |
| 405 | { |
| 406 | viafb_irq_disable(VDE_I_C0AVEN); |
| 407 | viacam_write_reg(cam, VCR_INTCTRL, 0); |
| 408 | } |
| 409 | |
| 410 | |
| 411 | |
| 412 | /* --------------------------------------------------------------------------*/ |
| 413 | /* Controller operations */ |
| 414 | |
| 415 | /* |
| 416 | * Set up our capture buffers in framebuffer memory. |
| 417 | */ |
| 418 | static int viacam_ctlr_cbufs(struct via_camera *cam) |
| 419 | { |
| 420 | int nbuf = cam->viadev->camera_fbmem_size/cam->sensor_format.sizeimage; |
| 421 | int i; |
| 422 | unsigned int offset; |
| 423 | |
| 424 | /* |
| 425 | * See how many buffers we can work with. |
| 426 | */ |
| 427 | if (nbuf >= 3) { |
| 428 | cam->n_cap_bufs = 3; |
| 429 | viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_3BUFS, |
| 430 | VCR_CI_3BUFS); |
| 431 | } else if (nbuf == 2) { |
| 432 | cam->n_cap_bufs = 2; |
| 433 | viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_3BUFS); |
| 434 | } else { |
| 435 | cam_warn(cam, "Insufficient frame buffer memory\n"); |
| 436 | return -ENOMEM; |
| 437 | } |
| 438 | /* |
| 439 | * Set them up. |
| 440 | */ |
| 441 | offset = cam->fb_offset; |
| 442 | for (i = 0; i < cam->n_cap_bufs; i++) { |
| 443 | cam->cb_offsets[i] = offset; |
| 444 | cam->cb_addrs[i] = cam->fbmem + offset; |
| 445 | viacam_write_reg(cam, VCR_VBUF1 + i*4, offset & VCR_VBUF_MASK); |
| 446 | offset += cam->sensor_format.sizeimage; |
| 447 | } |
| 448 | return 0; |
| 449 | } |
| 450 | |
| 451 | /* |
| 452 | * Set the scaling register for downscaling the image. |
| 453 | * |
| 454 | * This register works like this... Vertical scaling is enabled |
| 455 | * by bit 26; if that bit is set, downscaling is controlled by the |
| 456 | * value in bits 16:25. Those bits are divided by 1024 to get |
| 457 | * the scaling factor; setting just bit 25 thus cuts the height |
| 458 | * in half. |
| 459 | * |
| 460 | * Horizontal scaling works about the same, but it's enabled by |
| 461 | * bit 11, with bits 0:10 giving the numerator of a fraction |
| 462 | * (over 2048) for the scaling value. |
| 463 | * |
| 464 | * This function is naive in that, if the user departs from |
| 465 | * the 3x4 VGA scaling factor, the image will distort. We |
| 466 | * could work around that if it really seemed important. |
| 467 | */ |
| 468 | static void viacam_set_scale(struct via_camera *cam) |
| 469 | { |
| 470 | unsigned int avscale; |
| 471 | int sf; |
| 472 | |
| 473 | if (cam->user_format.width == VGA_WIDTH) |
| 474 | avscale = 0; |
| 475 | else { |
| 476 | sf = (cam->user_format.width*2048)/VGA_WIDTH; |
| 477 | avscale = VCR_AVS_HEN | sf; |
| 478 | } |
| 479 | if (cam->user_format.height < VGA_HEIGHT) { |
| 480 | sf = (1024*cam->user_format.height)/VGA_HEIGHT; |
| 481 | avscale |= VCR_AVS_VEN | (sf << 16); |
| 482 | } |
| 483 | viacam_write_reg(cam, VCR_AVSCALE, avscale); |
| 484 | } |
| 485 | |
| 486 | |
| 487 | /* |
| 488 | * Configure image-related information into the capture engine. |
| 489 | */ |
| 490 | static void viacam_ctlr_image(struct via_camera *cam) |
| 491 | { |
| 492 | int cicreg; |
| 493 | |
| 494 | /* |
| 495 | * Disable clock before messing with stuff - from the via |
| 496 | * sample driver. |
| 497 | */ |
| 498 | viacam_write_reg(cam, VCR_CAPINTC, ~(VCR_CI_ENABLE|VCR_CI_CLKEN)); |
| 499 | /* |
| 500 | * Set up the controller for VGA resolution, modulo magic |
| 501 | * offsets from the via sample driver. |
| 502 | */ |
| 503 | viacam_write_reg(cam, VCR_HORRANGE, 0x06200120); |
| 504 | viacam_write_reg(cam, VCR_VERTRANGE, 0x01de0000); |
| 505 | viacam_set_scale(cam); |
| 506 | /* |
| 507 | * Image size info. |
| 508 | */ |
| 509 | viacam_write_reg(cam, VCR_MAXDATA, |
| 510 | (cam->sensor_format.height << 16) | |
| 511 | (cam->sensor_format.bytesperline >> 3)); |
| 512 | viacam_write_reg(cam, VCR_MAXVBI, 0); |
| 513 | viacam_write_reg(cam, VCR_VSTRIDE, |
| 514 | cam->user_format.bytesperline & VCR_VS_STRIDE); |
| 515 | /* |
| 516 | * Set up the capture interface control register, |
| 517 | * everything but the "go" bit. |
| 518 | * |
| 519 | * The FIFO threshold is a bit of a magic number; 8 is what |
| 520 | * VIA's sample code uses. |
| 521 | */ |
| 522 | cicreg = VCR_CI_CLKEN | |
| 523 | 0x08000000 | /* FIFO threshold */ |
| 524 | VCR_CI_FLDINV | /* OLPC-specific? */ |
| 525 | VCR_CI_VREFINV | /* OLPC-specific? */ |
| 526 | VCR_CI_DIBOTH | /* Capture both fields */ |
| 527 | VCR_CI_CCIR601_8; |
| 528 | if (cam->n_cap_bufs == 3) |
| 529 | cicreg |= VCR_CI_3BUFS; |
| 530 | /* |
| 531 | * YUV formats need different byte swapping than RGB. |
| 532 | */ |
| 533 | if (cam->user_format.pixelformat == V4L2_PIX_FMT_YUYV) |
| 534 | cicreg |= VCR_CI_YUYV; |
| 535 | else |
| 536 | cicreg |= VCR_CI_UYVY; |
| 537 | viacam_write_reg(cam, VCR_CAPINTC, cicreg); |
| 538 | } |
| 539 | |
| 540 | |
| 541 | static int viacam_config_controller(struct via_camera *cam) |
| 542 | { |
| 543 | int ret; |
| 544 | unsigned long flags; |
| 545 | |
| 546 | spin_lock_irqsave(&cam->viadev->reg_lock, flags); |
| 547 | ret = viacam_ctlr_cbufs(cam); |
| 548 | if (!ret) |
| 549 | viacam_ctlr_image(cam); |
| 550 | spin_unlock_irqrestore(&cam->viadev->reg_lock, flags); |
| 551 | clear_bit(CF_CONFIG_NEEDED, &cam->flags); |
| 552 | return ret; |
| 553 | } |
| 554 | |
| 555 | /* |
| 556 | * Make it start grabbing data. |
| 557 | */ |
| 558 | static void viacam_start_engine(struct via_camera *cam) |
| 559 | { |
| 560 | spin_lock_irq(&cam->viadev->reg_lock); |
| 561 | cam->next_buf = 0; |
| 562 | viacam_write_reg_mask(cam, VCR_CAPINTC, VCR_CI_ENABLE, VCR_CI_ENABLE); |
| 563 | viacam_int_enable(cam); |
| 564 | (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */ |
| 565 | cam->opstate = S_RUNNING; |
| 566 | spin_unlock_irq(&cam->viadev->reg_lock); |
| 567 | } |
| 568 | |
| 569 | |
| 570 | static void viacam_stop_engine(struct via_camera *cam) |
| 571 | { |
| 572 | spin_lock_irq(&cam->viadev->reg_lock); |
| 573 | viacam_int_disable(cam); |
| 574 | viacam_write_reg_mask(cam, VCR_CAPINTC, 0, VCR_CI_ENABLE); |
| 575 | (void) viacam_read_reg(cam, VCR_CAPINTC); /* Force post */ |
| 576 | cam->opstate = S_IDLE; |
| 577 | spin_unlock_irq(&cam->viadev->reg_lock); |
| 578 | } |
| 579 | |
| 580 | |
| 581 | /* --------------------------------------------------------------------------*/ |
| 582 | /* Videobuf callback ops */ |
| 583 | |
| 584 | /* |
| 585 | * buffer_setup. The purpose of this one would appear to be to tell |
| 586 | * videobuf how big a single image is. It's also evidently up to us |
| 587 | * to put some sort of limit on the maximum number of buffers allowed. |
| 588 | */ |
| 589 | static int viacam_vb_buf_setup(struct videobuf_queue *q, |
| 590 | unsigned int *count, unsigned int *size) |
| 591 | { |
| 592 | struct via_camera *cam = q->priv_data; |
| 593 | |
| 594 | *size = cam->user_format.sizeimage; |
| 595 | if (*count == 0 || *count > 6) /* Arbitrary number */ |
| 596 | *count = 6; |
| 597 | return 0; |
| 598 | } |
| 599 | |
| 600 | /* |
| 601 | * Prepare a buffer. |
| 602 | */ |
| 603 | static int viacam_vb_buf_prepare(struct videobuf_queue *q, |
| 604 | struct videobuf_buffer *vb, enum v4l2_field field) |
| 605 | { |
| 606 | struct via_camera *cam = q->priv_data; |
| 607 | |
| 608 | vb->size = cam->user_format.sizeimage; |
| 609 | vb->width = cam->user_format.width; /* bytesperline???? */ |
| 610 | vb->height = cam->user_format.height; |
| 611 | vb->field = field; |
| 612 | if (vb->state == VIDEOBUF_NEEDS_INIT) { |
| 613 | int ret = videobuf_iolock(q, vb, NULL); |
| 614 | if (ret) |
| 615 | return ret; |
| 616 | } |
| 617 | vb->state = VIDEOBUF_PREPARED; |
| 618 | return 0; |
| 619 | } |
| 620 | |
| 621 | /* |
| 622 | * We've got a buffer to put data into. |
| 623 | * |
| 624 | * FIXME: check for a running engine and valid buffers? |
| 625 | */ |
| 626 | static void viacam_vb_buf_queue(struct videobuf_queue *q, |
| 627 | struct videobuf_buffer *vb) |
| 628 | { |
| 629 | struct via_camera *cam = q->priv_data; |
| 630 | |
| 631 | /* |
| 632 | * Note that videobuf holds the lock when it calls |
| 633 | * us, so we need not (indeed, cannot) take it here. |
| 634 | */ |
| 635 | vb->state = VIDEOBUF_QUEUED; |
| 636 | list_add_tail(&vb->queue, &cam->buffer_queue); |
| 637 | } |
| 638 | |
| 639 | /* |
| 640 | * Free a buffer. |
| 641 | */ |
| 642 | static void viacam_vb_buf_release(struct videobuf_queue *q, |
| 643 | struct videobuf_buffer *vb) |
| 644 | { |
| 645 | struct via_camera *cam = q->priv_data; |
| 646 | |
| 647 | videobuf_dma_unmap(&cam->platdev->dev, videobuf_to_dma(vb)); |
| 648 | videobuf_dma_free(videobuf_to_dma(vb)); |
| 649 | vb->state = VIDEOBUF_NEEDS_INIT; |
| 650 | } |
| 651 | |
| 652 | static const struct videobuf_queue_ops viacam_vb_ops = { |
| 653 | .buf_setup = viacam_vb_buf_setup, |
| 654 | .buf_prepare = viacam_vb_buf_prepare, |
| 655 | .buf_queue = viacam_vb_buf_queue, |
| 656 | .buf_release = viacam_vb_buf_release, |
| 657 | }; |
| 658 | |
| 659 | /* --------------------------------------------------------------------------*/ |
| 660 | /* File operations */ |
| 661 | |
| 662 | static int viacam_open(struct file *filp) |
| 663 | { |
| 664 | struct via_camera *cam = video_drvdata(filp); |
| 665 | |
| 666 | filp->private_data = cam; |
| 667 | /* |
| 668 | * Note the new user. If this is the first one, we'll also |
| 669 | * need to power up the sensor. |
| 670 | */ |
| 671 | mutex_lock(&cam->lock); |
| 672 | if (cam->users == 0) { |
| 673 | int ret = viafb_request_dma(); |
| 674 | |
| 675 | if (ret) { |
| 676 | mutex_unlock(&cam->lock); |
| 677 | return ret; |
| 678 | } |
| 679 | via_sensor_power_up(cam); |
| 680 | set_bit(CF_CONFIG_NEEDED, &cam->flags); |
| 681 | /* |
| 682 | * Hook into videobuf. Evidently this cannot fail. |
| 683 | */ |
| 684 | videobuf_queue_sg_init(&cam->vb_queue, &viacam_vb_ops, |
| 685 | &cam->platdev->dev, &cam->viadev->reg_lock, |
| 686 | V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE, |
| 687 | sizeof(struct videobuf_buffer), cam, NULL); |
| 688 | } |
| 689 | (cam->users)++; |
| 690 | mutex_unlock(&cam->lock); |
| 691 | return 0; |
| 692 | } |
| 693 | |
| 694 | static int viacam_release(struct file *filp) |
| 695 | { |
| 696 | struct via_camera *cam = video_drvdata(filp); |
| 697 | |
| 698 | mutex_lock(&cam->lock); |
| 699 | (cam->users)--; |
| 700 | /* |
| 701 | * If the "owner" is closing, shut down any ongoing |
| 702 | * operations. |
| 703 | */ |
| 704 | if (filp == cam->owner) { |
| 705 | videobuf_stop(&cam->vb_queue); |
| 706 | /* |
| 707 | * We don't hold the spinlock here, but, if release() |
| 708 | * is being called by the owner, nobody else will |
| 709 | * be changing the state. And an extra stop would |
| 710 | * not hurt anyway. |
| 711 | */ |
| 712 | if (cam->opstate != S_IDLE) |
| 713 | viacam_stop_engine(cam); |
| 714 | cam->owner = NULL; |
| 715 | } |
| 716 | /* |
| 717 | * Last one out needs to turn out the lights. |
| 718 | */ |
| 719 | if (cam->users == 0) { |
| 720 | videobuf_mmap_free(&cam->vb_queue); |
| 721 | via_sensor_power_down(cam); |
| 722 | viafb_release_dma(); |
| 723 | } |
| 724 | mutex_unlock(&cam->lock); |
| 725 | return 0; |
| 726 | } |
| 727 | |
| 728 | /* |
| 729 | * Read a frame from the device. |
| 730 | */ |
| 731 | static ssize_t viacam_read(struct file *filp, char __user *buffer, |
| 732 | size_t len, loff_t *pos) |
| 733 | { |
| 734 | struct via_camera *cam = video_drvdata(filp); |
| 735 | int ret; |
| 736 | |
| 737 | mutex_lock(&cam->lock); |
| 738 | /* |
| 739 | * Enforce the V4l2 "only one owner gets to read data" rule. |
| 740 | */ |
| 741 | if (cam->owner && cam->owner != filp) { |
| 742 | ret = -EBUSY; |
| 743 | goto out_unlock; |
| 744 | } |
| 745 | cam->owner = filp; |
| 746 | /* |
| 747 | * Do we need to configure the hardware? |
| 748 | */ |
| 749 | if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) { |
| 750 | ret = viacam_configure_sensor(cam); |
| 751 | if (!ret) |
| 752 | ret = viacam_config_controller(cam); |
| 753 | if (ret) |
| 754 | goto out_unlock; |
| 755 | } |
| 756 | /* |
| 757 | * Fire up the capture engine, then have videobuf do |
| 758 | * the heavy lifting. Someday it would be good to avoid |
| 759 | * stopping and restarting the engine each time. |
| 760 | */ |
| 761 | INIT_LIST_HEAD(&cam->buffer_queue); |
| 762 | viacam_start_engine(cam); |
| 763 | ret = videobuf_read_stream(&cam->vb_queue, buffer, len, pos, 0, |
| 764 | filp->f_flags & O_NONBLOCK); |
| 765 | viacam_stop_engine(cam); |
| 766 | /* videobuf_stop() ?? */ |
| 767 | |
| 768 | out_unlock: |
| 769 | mutex_unlock(&cam->lock); |
| 770 | return ret; |
| 771 | } |
| 772 | |
| 773 | |
| 774 | static unsigned int viacam_poll(struct file *filp, struct poll_table_struct *pt) |
| 775 | { |
| 776 | struct via_camera *cam = video_drvdata(filp); |
| 777 | |
| 778 | return videobuf_poll_stream(filp, &cam->vb_queue, pt); |
| 779 | } |
| 780 | |
| 781 | |
| 782 | static int viacam_mmap(struct file *filp, struct vm_area_struct *vma) |
| 783 | { |
| 784 | struct via_camera *cam = video_drvdata(filp); |
| 785 | |
| 786 | return videobuf_mmap_mapper(&cam->vb_queue, vma); |
| 787 | } |
| 788 | |
| 789 | |
| 790 | |
| 791 | static const struct v4l2_file_operations viacam_fops = { |
| 792 | .owner = THIS_MODULE, |
| 793 | .open = viacam_open, |
| 794 | .release = viacam_release, |
| 795 | .read = viacam_read, |
| 796 | .poll = viacam_poll, |
| 797 | .mmap = viacam_mmap, |
| 798 | .unlocked_ioctl = video_ioctl2, |
| 799 | }; |
| 800 | |
| 801 | /*----------------------------------------------------------------------------*/ |
| 802 | /* |
| 803 | * The long list of v4l2 ioctl ops |
| 804 | */ |
| 805 | |
| 806 | static int viacam_g_chip_ident(struct file *file, void *priv, |
| 807 | struct v4l2_dbg_chip_ident *ident) |
| 808 | { |
| 809 | struct via_camera *cam = priv; |
| 810 | |
| 811 | ident->ident = V4L2_IDENT_NONE; |
| 812 | ident->revision = 0; |
| 813 | if (v4l2_chip_match_host(&ident->match)) { |
| 814 | ident->ident = V4L2_IDENT_VIA_VX855; |
| 815 | return 0; |
| 816 | } |
| 817 | return sensor_call(cam, core, g_chip_ident, ident); |
| 818 | } |
| 819 | |
| 820 | /* |
| 821 | * Control ops are passed through to the sensor. |
| 822 | */ |
| 823 | static int viacam_queryctrl(struct file *filp, void *priv, |
| 824 | struct v4l2_queryctrl *qc) |
| 825 | { |
| 826 | struct via_camera *cam = priv; |
| 827 | int ret; |
| 828 | |
| 829 | mutex_lock(&cam->lock); |
| 830 | ret = sensor_call(cam, core, queryctrl, qc); |
| 831 | mutex_unlock(&cam->lock); |
| 832 | return ret; |
| 833 | } |
| 834 | |
| 835 | |
| 836 | static int viacam_g_ctrl(struct file *filp, void *priv, |
| 837 | struct v4l2_control *ctrl) |
| 838 | { |
| 839 | struct via_camera *cam = priv; |
| 840 | int ret; |
| 841 | |
| 842 | mutex_lock(&cam->lock); |
| 843 | ret = sensor_call(cam, core, g_ctrl, ctrl); |
| 844 | mutex_unlock(&cam->lock); |
| 845 | return ret; |
| 846 | } |
| 847 | |
| 848 | |
| 849 | static int viacam_s_ctrl(struct file *filp, void *priv, |
| 850 | struct v4l2_control *ctrl) |
| 851 | { |
| 852 | struct via_camera *cam = priv; |
| 853 | int ret; |
| 854 | |
| 855 | mutex_lock(&cam->lock); |
| 856 | ret = sensor_call(cam, core, s_ctrl, ctrl); |
| 857 | mutex_unlock(&cam->lock); |
| 858 | return ret; |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * Only one input. |
| 863 | */ |
| 864 | static int viacam_enum_input(struct file *filp, void *priv, |
| 865 | struct v4l2_input *input) |
| 866 | { |
| 867 | if (input->index != 0) |
| 868 | return -EINVAL; |
| 869 | |
| 870 | input->type = V4L2_INPUT_TYPE_CAMERA; |
| 871 | input->std = V4L2_STD_ALL; /* Not sure what should go here */ |
| 872 | strcpy(input->name, "Camera"); |
| 873 | return 0; |
| 874 | } |
| 875 | |
| 876 | static int viacam_g_input(struct file *filp, void *priv, unsigned int *i) |
| 877 | { |
| 878 | *i = 0; |
| 879 | return 0; |
| 880 | } |
| 881 | |
| 882 | static int viacam_s_input(struct file *filp, void *priv, unsigned int i) |
| 883 | { |
| 884 | if (i != 0) |
| 885 | return -EINVAL; |
| 886 | return 0; |
| 887 | } |
| 888 | |
| 889 | static int viacam_s_std(struct file *filp, void *priv, v4l2_std_id *std) |
| 890 | { |
| 891 | return 0; |
| 892 | } |
| 893 | |
| 894 | /* |
| 895 | * Video format stuff. Here is our default format until |
| 896 | * user space messes with things. |
| 897 | */ |
| 898 | static const struct v4l2_pix_format viacam_def_pix_format = { |
| 899 | .width = VGA_WIDTH, |
| 900 | .height = VGA_HEIGHT, |
| 901 | .pixelformat = V4L2_PIX_FMT_YUYV, |
| 902 | .field = V4L2_FIELD_NONE, |
| 903 | .bytesperline = VGA_WIDTH * 2, |
| 904 | .sizeimage = VGA_WIDTH * VGA_HEIGHT * 2, |
| 905 | }; |
| 906 | |
| 907 | static const enum v4l2_mbus_pixelcode via_def_mbus_code = V4L2_MBUS_FMT_YUYV8_2X8; |
| 908 | |
| 909 | static int viacam_enum_fmt_vid_cap(struct file *filp, void *priv, |
| 910 | struct v4l2_fmtdesc *fmt) |
| 911 | { |
| 912 | if (fmt->index >= N_VIA_FMTS) |
| 913 | return -EINVAL; |
| 914 | strlcpy(fmt->description, via_formats[fmt->index].desc, |
| 915 | sizeof(fmt->description)); |
| 916 | fmt->pixelformat = via_formats[fmt->index].pixelformat; |
| 917 | return 0; |
| 918 | } |
| 919 | |
| 920 | /* |
| 921 | * Figure out proper image dimensions, but always force the |
| 922 | * sensor to VGA. |
| 923 | */ |
| 924 | static void viacam_fmt_pre(struct v4l2_pix_format *userfmt, |
| 925 | struct v4l2_pix_format *sensorfmt) |
| 926 | { |
| 927 | *sensorfmt = *userfmt; |
| 928 | if (userfmt->width < QCIF_WIDTH || userfmt->height < QCIF_HEIGHT) { |
| 929 | userfmt->width = QCIF_WIDTH; |
| 930 | userfmt->height = QCIF_HEIGHT; |
| 931 | } |
| 932 | if (userfmt->width > VGA_WIDTH || userfmt->height > VGA_HEIGHT) { |
| 933 | userfmt->width = VGA_WIDTH; |
| 934 | userfmt->height = VGA_HEIGHT; |
| 935 | } |
| 936 | sensorfmt->width = VGA_WIDTH; |
| 937 | sensorfmt->height = VGA_HEIGHT; |
| 938 | } |
| 939 | |
| 940 | static void viacam_fmt_post(struct v4l2_pix_format *userfmt, |
| 941 | struct v4l2_pix_format *sensorfmt) |
| 942 | { |
| 943 | struct via_format *f = via_find_format(userfmt->pixelformat); |
| 944 | |
| 945 | sensorfmt->bytesperline = sensorfmt->width * f->bpp; |
| 946 | sensorfmt->sizeimage = sensorfmt->height * sensorfmt->bytesperline; |
| 947 | userfmt->pixelformat = sensorfmt->pixelformat; |
| 948 | userfmt->field = sensorfmt->field; |
| 949 | userfmt->bytesperline = 2 * userfmt->width; |
| 950 | userfmt->sizeimage = userfmt->bytesperline * userfmt->height; |
| 951 | } |
| 952 | |
| 953 | |
| 954 | /* |
| 955 | * The real work of figuring out a workable format. |
| 956 | */ |
| 957 | static int viacam_do_try_fmt(struct via_camera *cam, |
| 958 | struct v4l2_pix_format *upix, struct v4l2_pix_format *spix) |
| 959 | { |
| 960 | int ret; |
| 961 | struct v4l2_mbus_framefmt mbus_fmt; |
| 962 | struct via_format *f = via_find_format(upix->pixelformat); |
| 963 | |
| 964 | upix->pixelformat = f->pixelformat; |
| 965 | viacam_fmt_pre(upix, spix); |
| 966 | v4l2_fill_mbus_format(&mbus_fmt, upix, f->mbus_code); |
| 967 | ret = sensor_call(cam, video, try_mbus_fmt, &mbus_fmt); |
| 968 | v4l2_fill_pix_format(spix, &mbus_fmt); |
| 969 | viacam_fmt_post(upix, spix); |
| 970 | return ret; |
| 971 | } |
| 972 | |
| 973 | |
| 974 | |
| 975 | static int viacam_try_fmt_vid_cap(struct file *filp, void *priv, |
| 976 | struct v4l2_format *fmt) |
| 977 | { |
| 978 | struct via_camera *cam = priv; |
| 979 | struct v4l2_format sfmt; |
| 980 | int ret; |
| 981 | |
| 982 | mutex_lock(&cam->lock); |
| 983 | ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix); |
| 984 | mutex_unlock(&cam->lock); |
| 985 | return ret; |
| 986 | } |
| 987 | |
| 988 | |
| 989 | static int viacam_g_fmt_vid_cap(struct file *filp, void *priv, |
| 990 | struct v4l2_format *fmt) |
| 991 | { |
| 992 | struct via_camera *cam = priv; |
| 993 | |
| 994 | mutex_lock(&cam->lock); |
| 995 | fmt->fmt.pix = cam->user_format; |
| 996 | mutex_unlock(&cam->lock); |
| 997 | return 0; |
| 998 | } |
| 999 | |
| 1000 | static int viacam_s_fmt_vid_cap(struct file *filp, void *priv, |
| 1001 | struct v4l2_format *fmt) |
| 1002 | { |
| 1003 | struct via_camera *cam = priv; |
| 1004 | int ret; |
| 1005 | struct v4l2_format sfmt; |
| 1006 | struct via_format *f = via_find_format(fmt->fmt.pix.pixelformat); |
| 1007 | |
| 1008 | /* |
| 1009 | * Camera must be idle or we can't mess with the |
| 1010 | * video setup. |
| 1011 | */ |
| 1012 | mutex_lock(&cam->lock); |
| 1013 | if (cam->opstate != S_IDLE) { |
| 1014 | ret = -EBUSY; |
| 1015 | goto out; |
| 1016 | } |
| 1017 | /* |
| 1018 | * Let the sensor code look over and tweak the |
| 1019 | * requested formatting. |
| 1020 | */ |
| 1021 | ret = viacam_do_try_fmt(cam, &fmt->fmt.pix, &sfmt.fmt.pix); |
| 1022 | if (ret) |
| 1023 | goto out; |
| 1024 | /* |
| 1025 | * OK, let's commit to the new format. |
| 1026 | */ |
| 1027 | cam->user_format = fmt->fmt.pix; |
| 1028 | cam->sensor_format = sfmt.fmt.pix; |
| 1029 | cam->mbus_code = f->mbus_code; |
| 1030 | ret = viacam_configure_sensor(cam); |
| 1031 | if (!ret) |
| 1032 | ret = viacam_config_controller(cam); |
| 1033 | out: |
| 1034 | mutex_unlock(&cam->lock); |
| 1035 | return ret; |
| 1036 | } |
| 1037 | |
| 1038 | static int viacam_querycap(struct file *filp, void *priv, |
| 1039 | struct v4l2_capability *cap) |
| 1040 | { |
| 1041 | strcpy(cap->driver, "via-camera"); |
| 1042 | strcpy(cap->card, "via-camera"); |
| 1043 | cap->version = 1; |
| 1044 | cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | |
| 1045 | V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; |
| 1046 | return 0; |
| 1047 | } |
| 1048 | |
| 1049 | /* |
| 1050 | * Streaming operations - pure videobuf stuff. |
| 1051 | */ |
| 1052 | static int viacam_reqbufs(struct file *filp, void *priv, |
| 1053 | struct v4l2_requestbuffers *rb) |
| 1054 | { |
| 1055 | struct via_camera *cam = priv; |
| 1056 | |
| 1057 | return videobuf_reqbufs(&cam->vb_queue, rb); |
| 1058 | } |
| 1059 | |
| 1060 | static int viacam_querybuf(struct file *filp, void *priv, |
| 1061 | struct v4l2_buffer *buf) |
| 1062 | { |
| 1063 | struct via_camera *cam = priv; |
| 1064 | |
| 1065 | return videobuf_querybuf(&cam->vb_queue, buf); |
| 1066 | } |
| 1067 | |
| 1068 | static int viacam_qbuf(struct file *filp, void *priv, struct v4l2_buffer *buf) |
| 1069 | { |
| 1070 | struct via_camera *cam = priv; |
| 1071 | |
| 1072 | return videobuf_qbuf(&cam->vb_queue, buf); |
| 1073 | } |
| 1074 | |
| 1075 | static int viacam_dqbuf(struct file *filp, void *priv, struct v4l2_buffer *buf) |
| 1076 | { |
| 1077 | struct via_camera *cam = priv; |
| 1078 | |
| 1079 | return videobuf_dqbuf(&cam->vb_queue, buf, filp->f_flags & O_NONBLOCK); |
| 1080 | } |
| 1081 | |
| 1082 | static int viacam_streamon(struct file *filp, void *priv, enum v4l2_buf_type t) |
| 1083 | { |
| 1084 | struct via_camera *cam = priv; |
| 1085 | int ret = 0; |
| 1086 | |
| 1087 | if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE) |
| 1088 | return -EINVAL; |
| 1089 | |
| 1090 | mutex_lock(&cam->lock); |
| 1091 | if (cam->opstate != S_IDLE) { |
| 1092 | ret = -EBUSY; |
| 1093 | goto out; |
| 1094 | } |
| 1095 | /* |
| 1096 | * Enforce the V4l2 "only one owner gets to read data" rule. |
| 1097 | */ |
| 1098 | if (cam->owner && cam->owner != filp) { |
| 1099 | ret = -EBUSY; |
| 1100 | goto out; |
| 1101 | } |
| 1102 | cam->owner = filp; |
| 1103 | /* |
| 1104 | * Configure things if need be. |
| 1105 | */ |
| 1106 | if (test_bit(CF_CONFIG_NEEDED, &cam->flags)) { |
| 1107 | ret = viacam_configure_sensor(cam); |
| 1108 | if (ret) |
| 1109 | goto out; |
| 1110 | ret = viacam_config_controller(cam); |
| 1111 | if (ret) |
| 1112 | goto out; |
| 1113 | } |
| 1114 | /* |
| 1115 | * If the CPU goes into C3, the DMA transfer gets corrupted and |
| 1116 | * users start filing unsightly bug reports. Put in a "latency" |
| 1117 | * requirement which will keep the CPU out of the deeper sleep |
| 1118 | * states. |
| 1119 | */ |
| 1120 | pm_qos_add_request(&cam->qos_request, PM_QOS_CPU_DMA_LATENCY, 50); |
| 1121 | /* |
| 1122 | * Fire things up. |
| 1123 | */ |
| 1124 | INIT_LIST_HEAD(&cam->buffer_queue); |
| 1125 | ret = videobuf_streamon(&cam->vb_queue); |
| 1126 | if (!ret) |
| 1127 | viacam_start_engine(cam); |
| 1128 | out: |
| 1129 | mutex_unlock(&cam->lock); |
| 1130 | return ret; |
| 1131 | } |
| 1132 | |
| 1133 | static int viacam_streamoff(struct file *filp, void *priv, enum v4l2_buf_type t) |
| 1134 | { |
| 1135 | struct via_camera *cam = priv; |
| 1136 | int ret; |
| 1137 | |
| 1138 | if (t != V4L2_BUF_TYPE_VIDEO_CAPTURE) |
| 1139 | return -EINVAL; |
| 1140 | mutex_lock(&cam->lock); |
| 1141 | if (cam->opstate != S_RUNNING) { |
| 1142 | ret = -EINVAL; |
| 1143 | goto out; |
| 1144 | } |
| 1145 | pm_qos_remove_request(&cam->qos_request); |
| 1146 | viacam_stop_engine(cam); |
| 1147 | /* |
| 1148 | * Videobuf will recycle all of the outstanding buffers, but |
| 1149 | * we should be sure we don't retain any references to |
| 1150 | * any of them. |
| 1151 | */ |
| 1152 | ret = videobuf_streamoff(&cam->vb_queue); |
| 1153 | INIT_LIST_HEAD(&cam->buffer_queue); |
| 1154 | out: |
| 1155 | mutex_unlock(&cam->lock); |
| 1156 | return ret; |
| 1157 | } |
| 1158 | |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 1159 | /* G/S_PARM */ |
| 1160 | |
| 1161 | static int viacam_g_parm(struct file *filp, void *priv, |
| 1162 | struct v4l2_streamparm *parm) |
| 1163 | { |
| 1164 | struct via_camera *cam = priv; |
| 1165 | int ret; |
| 1166 | |
| 1167 | mutex_lock(&cam->lock); |
| 1168 | ret = sensor_call(cam, video, g_parm, parm); |
| 1169 | mutex_unlock(&cam->lock); |
| 1170 | parm->parm.capture.readbuffers = cam->n_cap_bufs; |
| 1171 | return ret; |
| 1172 | } |
| 1173 | |
| 1174 | static int viacam_s_parm(struct file *filp, void *priv, |
| 1175 | struct v4l2_streamparm *parm) |
| 1176 | { |
| 1177 | struct via_camera *cam = priv; |
| 1178 | int ret; |
| 1179 | |
| 1180 | mutex_lock(&cam->lock); |
| 1181 | ret = sensor_call(cam, video, s_parm, parm); |
| 1182 | mutex_unlock(&cam->lock); |
| 1183 | parm->parm.capture.readbuffers = cam->n_cap_bufs; |
| 1184 | return ret; |
| 1185 | } |
| 1186 | |
| 1187 | static int viacam_enum_framesizes(struct file *filp, void *priv, |
| 1188 | struct v4l2_frmsizeenum *sizes) |
| 1189 | { |
| 1190 | if (sizes->index != 0) |
| 1191 | return -EINVAL; |
| 1192 | sizes->type = V4L2_FRMSIZE_TYPE_CONTINUOUS; |
| 1193 | sizes->stepwise.min_width = QCIF_WIDTH; |
| 1194 | sizes->stepwise.min_height = QCIF_HEIGHT; |
| 1195 | sizes->stepwise.max_width = VGA_WIDTH; |
| 1196 | sizes->stepwise.max_height = VGA_HEIGHT; |
| 1197 | sizes->stepwise.step_width = sizes->stepwise.step_height = 1; |
| 1198 | return 0; |
| 1199 | } |
| 1200 | |
| 1201 | static int viacam_enum_frameintervals(struct file *filp, void *priv, |
| 1202 | struct v4l2_frmivalenum *interval) |
| 1203 | { |
| 1204 | struct via_camera *cam = priv; |
| 1205 | int ret; |
| 1206 | |
| 1207 | mutex_lock(&cam->lock); |
| 1208 | ret = sensor_call(cam, video, enum_frameintervals, interval); |
| 1209 | mutex_unlock(&cam->lock); |
| 1210 | return ret; |
| 1211 | } |
| 1212 | |
| 1213 | |
| 1214 | |
| 1215 | static const struct v4l2_ioctl_ops viacam_ioctl_ops = { |
| 1216 | .vidioc_g_chip_ident = viacam_g_chip_ident, |
| 1217 | .vidioc_queryctrl = viacam_queryctrl, |
| 1218 | .vidioc_g_ctrl = viacam_g_ctrl, |
| 1219 | .vidioc_s_ctrl = viacam_s_ctrl, |
| 1220 | .vidioc_enum_input = viacam_enum_input, |
| 1221 | .vidioc_g_input = viacam_g_input, |
| 1222 | .vidioc_s_input = viacam_s_input, |
| 1223 | .vidioc_s_std = viacam_s_std, |
| 1224 | .vidioc_enum_fmt_vid_cap = viacam_enum_fmt_vid_cap, |
| 1225 | .vidioc_try_fmt_vid_cap = viacam_try_fmt_vid_cap, |
| 1226 | .vidioc_g_fmt_vid_cap = viacam_g_fmt_vid_cap, |
| 1227 | .vidioc_s_fmt_vid_cap = viacam_s_fmt_vid_cap, |
| 1228 | .vidioc_querycap = viacam_querycap, |
| 1229 | .vidioc_reqbufs = viacam_reqbufs, |
| 1230 | .vidioc_querybuf = viacam_querybuf, |
| 1231 | .vidioc_qbuf = viacam_qbuf, |
| 1232 | .vidioc_dqbuf = viacam_dqbuf, |
| 1233 | .vidioc_streamon = viacam_streamon, |
| 1234 | .vidioc_streamoff = viacam_streamoff, |
| 1235 | .vidioc_g_parm = viacam_g_parm, |
| 1236 | .vidioc_s_parm = viacam_s_parm, |
| 1237 | .vidioc_enum_framesizes = viacam_enum_framesizes, |
| 1238 | .vidioc_enum_frameintervals = viacam_enum_frameintervals, |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 1239 | }; |
| 1240 | |
| 1241 | /*----------------------------------------------------------------------------*/ |
| 1242 | |
| 1243 | /* |
| 1244 | * Power management. |
| 1245 | */ |
Daniel Drake | 0522921 | 2011-02-11 18:15:02 -0300 | [diff] [blame] | 1246 | #ifdef CONFIG_PM |
| 1247 | |
| 1248 | static int viacam_suspend(void *priv) |
| 1249 | { |
| 1250 | struct via_camera *cam = priv; |
| 1251 | enum viacam_opstate state = cam->opstate; |
| 1252 | |
| 1253 | if (cam->opstate != S_IDLE) { |
| 1254 | viacam_stop_engine(cam); |
| 1255 | cam->opstate = state; /* So resume restarts */ |
| 1256 | } |
| 1257 | |
| 1258 | return 0; |
| 1259 | } |
| 1260 | |
| 1261 | static int viacam_resume(void *priv) |
| 1262 | { |
| 1263 | struct via_camera *cam = priv; |
| 1264 | int ret = 0; |
| 1265 | |
| 1266 | /* |
| 1267 | * Get back to a reasonable operating state. |
| 1268 | */ |
| 1269 | via_write_reg_mask(VIASR, 0x78, 0, 0x80); |
| 1270 | via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0); |
| 1271 | viacam_int_disable(cam); |
| 1272 | set_bit(CF_CONFIG_NEEDED, &cam->flags); |
| 1273 | /* |
| 1274 | * Make sure the sensor's power state is correct |
| 1275 | */ |
| 1276 | if (cam->users > 0) |
| 1277 | via_sensor_power_up(cam); |
| 1278 | else |
| 1279 | via_sensor_power_down(cam); |
| 1280 | /* |
| 1281 | * If it was operating, try to restart it. |
| 1282 | */ |
| 1283 | if (cam->opstate != S_IDLE) { |
| 1284 | mutex_lock(&cam->lock); |
| 1285 | ret = viacam_configure_sensor(cam); |
| 1286 | if (!ret) |
| 1287 | ret = viacam_config_controller(cam); |
| 1288 | mutex_unlock(&cam->lock); |
| 1289 | if (!ret) |
| 1290 | viacam_start_engine(cam); |
| 1291 | } |
| 1292 | |
| 1293 | return ret; |
| 1294 | } |
| 1295 | |
| 1296 | static struct viafb_pm_hooks viacam_pm_hooks = { |
| 1297 | .suspend = viacam_suspend, |
| 1298 | .resume = viacam_resume |
| 1299 | }; |
| 1300 | |
| 1301 | #endif /* CONFIG_PM */ |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 1302 | |
| 1303 | /* |
| 1304 | * Setup stuff. |
| 1305 | */ |
| 1306 | |
| 1307 | static struct video_device viacam_v4l_template = { |
| 1308 | .name = "via-camera", |
| 1309 | .minor = -1, |
| 1310 | .tvnorms = V4L2_STD_NTSC_M, |
| 1311 | .current_norm = V4L2_STD_NTSC_M, |
| 1312 | .fops = &viacam_fops, |
| 1313 | .ioctl_ops = &viacam_ioctl_ops, |
| 1314 | .release = video_device_release_empty, /* Check this */ |
| 1315 | }; |
| 1316 | |
Daniel Drake | c6384c8 | 2011-03-03 16:03:31 -0300 | [diff] [blame] | 1317 | /* |
| 1318 | * The OLPC folks put the serial port on the same pin as |
| 1319 | * the camera. They also get grumpy if we break the |
| 1320 | * serial port and keep them from using it. So we have |
| 1321 | * to check the serial enable bit and not step on it. |
| 1322 | */ |
| 1323 | #define VIACAM_SERIAL_DEVFN 0x88 |
| 1324 | #define VIACAM_SERIAL_CREG 0x46 |
| 1325 | #define VIACAM_SERIAL_BIT 0x40 |
| 1326 | |
| 1327 | static __devinit bool viacam_serial_is_enabled(void) |
| 1328 | { |
| 1329 | struct pci_bus *pbus = pci_find_bus(0, 0); |
| 1330 | u8 cbyte; |
| 1331 | |
Jesper Juhl | c8814df | 2011-08-01 18:39:17 -0300 | [diff] [blame] | 1332 | if (!pbus) |
| 1333 | return false; |
Daniel Drake | c6384c8 | 2011-03-03 16:03:31 -0300 | [diff] [blame] | 1334 | pci_bus_read_config_byte(pbus, VIACAM_SERIAL_DEVFN, |
| 1335 | VIACAM_SERIAL_CREG, &cbyte); |
| 1336 | if ((cbyte & VIACAM_SERIAL_BIT) == 0) |
| 1337 | return false; /* Not enabled */ |
| 1338 | if (override_serial == 0) { |
| 1339 | printk(KERN_NOTICE "Via camera: serial port is enabled, " \ |
| 1340 | "refusing to load.\n"); |
| 1341 | printk(KERN_NOTICE "Specify override_serial=1 to force " \ |
| 1342 | "module loading.\n"); |
| 1343 | return true; |
| 1344 | } |
| 1345 | printk(KERN_NOTICE "Via camera: overriding serial port\n"); |
| 1346 | pci_bus_write_config_byte(pbus, VIACAM_SERIAL_DEVFN, |
| 1347 | VIACAM_SERIAL_CREG, cbyte & ~VIACAM_SERIAL_BIT); |
| 1348 | return false; |
| 1349 | } |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 1350 | |
Daniel Drake | a39fbb1 | 2012-04-30 18:06:27 -0300 | [diff] [blame] | 1351 | static struct ov7670_config sensor_cfg = { |
| 1352 | /* The XO-1.5 (only known user) clocks the camera at 90MHz. */ |
| 1353 | .clock_speed = 90, |
| 1354 | }; |
| 1355 | |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 1356 | static __devinit int viacam_probe(struct platform_device *pdev) |
| 1357 | { |
| 1358 | int ret; |
| 1359 | struct i2c_adapter *sensor_adapter; |
| 1360 | struct viafb_dev *viadev = pdev->dev.platform_data; |
Daniel Drake | a39fbb1 | 2012-04-30 18:06:27 -0300 | [diff] [blame] | 1361 | struct i2c_board_info ov7670_info = { |
| 1362 | .type = "ov7670", |
| 1363 | .addr = 0x42 >> 1, |
| 1364 | .platform_data = &sensor_cfg, |
| 1365 | }; |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 1366 | |
| 1367 | /* |
| 1368 | * Note that there are actually two capture channels on |
| 1369 | * the device. We only deal with one for now. That |
| 1370 | * is encoded here; nothing else assumes it's dealing with |
| 1371 | * a unique capture device. |
| 1372 | */ |
| 1373 | struct via_camera *cam; |
| 1374 | |
| 1375 | /* |
| 1376 | * Ensure that frame buffer memory has been set aside for |
| 1377 | * this purpose. As an arbitrary limit, refuse to work |
| 1378 | * with less than two frames of VGA 16-bit data. |
| 1379 | * |
| 1380 | * If we ever support the second port, we'll need to set |
| 1381 | * aside more memory. |
| 1382 | */ |
| 1383 | if (viadev->camera_fbmem_size < (VGA_HEIGHT*VGA_WIDTH*4)) { |
| 1384 | printk(KERN_ERR "viacam: insufficient FB memory reserved\n"); |
| 1385 | return -ENOMEM; |
| 1386 | } |
| 1387 | if (viadev->engine_mmio == NULL) { |
| 1388 | printk(KERN_ERR "viacam: No I/O memory, so no pictures\n"); |
| 1389 | return -ENOMEM; |
| 1390 | } |
Daniel Drake | c6384c8 | 2011-03-03 16:03:31 -0300 | [diff] [blame] | 1391 | |
| 1392 | if (machine_is_olpc() && viacam_serial_is_enabled()) |
| 1393 | return -EBUSY; |
| 1394 | |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 1395 | /* |
| 1396 | * Basic structure initialization. |
| 1397 | */ |
| 1398 | cam = kzalloc (sizeof(struct via_camera), GFP_KERNEL); |
| 1399 | if (cam == NULL) |
| 1400 | return -ENOMEM; |
| 1401 | via_cam_info = cam; |
| 1402 | cam->platdev = pdev; |
| 1403 | cam->viadev = viadev; |
| 1404 | cam->users = 0; |
| 1405 | cam->owner = NULL; |
| 1406 | cam->opstate = S_IDLE; |
| 1407 | cam->user_format = cam->sensor_format = viacam_def_pix_format; |
| 1408 | mutex_init(&cam->lock); |
| 1409 | INIT_LIST_HEAD(&cam->buffer_queue); |
| 1410 | cam->mmio = viadev->engine_mmio; |
| 1411 | cam->fbmem = viadev->fbmem; |
| 1412 | cam->fb_offset = viadev->camera_fbmem_offset; |
| 1413 | cam->flags = 1 << CF_CONFIG_NEEDED; |
| 1414 | cam->mbus_code = via_def_mbus_code; |
| 1415 | /* |
| 1416 | * Tell V4L that we exist. |
| 1417 | */ |
| 1418 | ret = v4l2_device_register(&pdev->dev, &cam->v4l2_dev); |
| 1419 | if (ret) { |
| 1420 | dev_err(&pdev->dev, "Unable to register v4l2 device\n"); |
| 1421 | return ret; |
| 1422 | } |
| 1423 | /* |
| 1424 | * Convince the system that we can do DMA. |
| 1425 | */ |
| 1426 | pdev->dev.dma_mask = &viadev->pdev->dma_mask; |
| 1427 | dma_set_mask(&pdev->dev, 0xffffffff); |
| 1428 | /* |
| 1429 | * Fire up the capture port. The write to 0x78 looks purely |
| 1430 | * OLPCish; any system will need to tweak 0x1e. |
| 1431 | */ |
| 1432 | via_write_reg_mask(VIASR, 0x78, 0, 0x80); |
| 1433 | via_write_reg_mask(VIASR, 0x1e, 0xc0, 0xc0); |
| 1434 | /* |
| 1435 | * Get the sensor powered up. |
| 1436 | */ |
| 1437 | ret = via_sensor_power_setup(cam); |
| 1438 | if (ret) |
| 1439 | goto out_unregister; |
| 1440 | via_sensor_power_up(cam); |
| 1441 | |
| 1442 | /* |
| 1443 | * See if we can't find it on the bus. The VIA_PORT_31 assumption |
| 1444 | * is OLPC-specific. 0x42 assumption is ov7670-specific. |
| 1445 | */ |
| 1446 | sensor_adapter = viafb_find_i2c_adapter(VIA_PORT_31); |
Daniel Drake | a39fbb1 | 2012-04-30 18:06:27 -0300 | [diff] [blame] | 1447 | cam->sensor = v4l2_i2c_new_subdev_board(&cam->v4l2_dev, sensor_adapter, |
| 1448 | &ov7670_info, NULL); |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 1449 | if (cam->sensor == NULL) { |
| 1450 | dev_err(&pdev->dev, "Unable to find the sensor!\n"); |
| 1451 | ret = -ENODEV; |
| 1452 | goto out_power_down; |
| 1453 | } |
| 1454 | /* |
| 1455 | * Get the IRQ. |
| 1456 | */ |
| 1457 | viacam_int_disable(cam); |
| 1458 | ret = request_threaded_irq(viadev->pdev->irq, viacam_quick_irq, |
| 1459 | viacam_irq, IRQF_SHARED, "via-camera", cam); |
| 1460 | if (ret) |
| 1461 | goto out_power_down; |
| 1462 | /* |
| 1463 | * Tell V4l2 that we exist. |
| 1464 | */ |
| 1465 | cam->vdev = viacam_v4l_template; |
| 1466 | cam->vdev.v4l2_dev = &cam->v4l2_dev; |
| 1467 | ret = video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1); |
| 1468 | if (ret) |
| 1469 | goto out_irq; |
| 1470 | video_set_drvdata(&cam->vdev, cam); |
| 1471 | |
Daniel Drake | 0522921 | 2011-02-11 18:15:02 -0300 | [diff] [blame] | 1472 | #ifdef CONFIG_PM |
| 1473 | /* |
| 1474 | * Hook into PM events |
| 1475 | */ |
| 1476 | viacam_pm_hooks.private = cam; |
| 1477 | viafb_pm_register(&viacam_pm_hooks); |
| 1478 | #endif |
| 1479 | |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 1480 | /* Power the sensor down until somebody opens the device */ |
| 1481 | via_sensor_power_down(cam); |
| 1482 | return 0; |
| 1483 | |
| 1484 | out_irq: |
| 1485 | free_irq(viadev->pdev->irq, cam); |
| 1486 | out_power_down: |
| 1487 | via_sensor_power_release(cam); |
| 1488 | out_unregister: |
| 1489 | v4l2_device_unregister(&cam->v4l2_dev); |
| 1490 | return ret; |
| 1491 | } |
| 1492 | |
| 1493 | static __devexit int viacam_remove(struct platform_device *pdev) |
| 1494 | { |
| 1495 | struct via_camera *cam = via_cam_info; |
| 1496 | struct viafb_dev *viadev = pdev->dev.platform_data; |
| 1497 | |
| 1498 | video_unregister_device(&cam->vdev); |
| 1499 | v4l2_device_unregister(&cam->v4l2_dev); |
| 1500 | free_irq(viadev->pdev->irq, cam); |
| 1501 | via_sensor_power_release(cam); |
| 1502 | via_cam_info = NULL; |
| 1503 | return 0; |
| 1504 | } |
| 1505 | |
Jonathan Corbet | 024fafbac | 2010-10-19 21:32:11 -0300 | [diff] [blame] | 1506 | static struct platform_driver viacam_driver = { |
| 1507 | .driver = { |
| 1508 | .name = "viafb-camera", |
| 1509 | }, |
| 1510 | .probe = viacam_probe, |
| 1511 | .remove = viacam_remove, |
| 1512 | }; |
| 1513 | |
Axel Lin | 1d6629b | 2012-01-10 03:21:49 -0300 | [diff] [blame] | 1514 | module_platform_driver(viacam_driver); |