--- /dev/null
+/*
+ * gspca ViCam subdriver
+ *
+ * Copyright (C) 2011 Hans de Goede <hdegoede@redhat.com>
+ *
+ * Based on the usbvideo vicam driver, which is:
+ *
+ * Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
+ * Christopher L Cheney (ccheney@cheney.cx),
+ * Pavel Machek (pavel@ucw.cz),
+ * John Tyner (jtyner@cs.ucr.edu),
+ * Monroe Williams (monroe@pobox.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#define MODULE_NAME "vicam"
+#define HEADER_SIZE 64
+
+#include <linux/workqueue.h>
+#include <linux/slab.h>
+#include <linux/firmware.h>
+#include <linux/ihex.h>
+#include "gspca.h"
+
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_DESCRIPTION("GSPCA ViCam USB Camera Driver");
+MODULE_LICENSE("GPL");
+
+enum e_ctrl {
+ GAIN,
+ EXPOSURE,
+ NCTRL /* number of controls */
+};
+
+struct sd {
+ struct gspca_dev gspca_dev; /* !! must be the first item */
+ struct work_struct work_struct;
+ struct workqueue_struct *work_thread;
+ struct gspca_ctrl ctrls[NCTRL];
+};
+
+/* The vicam sensor has a resolution of 512 x 244, with I believe square
+ pixels, but this is forced to a 4:3 ratio by optics. So it has
+ non square pixels :( */
+static struct v4l2_pix_format vicam_mode[] = {
+ { 256, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
+ .bytesperline = 256,
+ .sizeimage = 256 * 122,
+ .colorspace = V4L2_COLORSPACE_SRGB,},
+ /* 2 modes with somewhat more square pixels */
+ { 256, 200, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
+ .bytesperline = 256,
+ .sizeimage = 256 * 200,
+ .colorspace = V4L2_COLORSPACE_SRGB,},
+ { 256, 240, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
+ .bytesperline = 256,
+ .sizeimage = 256 * 240,
+ .colorspace = V4L2_COLORSPACE_SRGB,},
+#if 0 /* This mode has extremely non square pixels, testing use only */
+ { 512, 122, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
+ .bytesperline = 512,
+ .sizeimage = 512 * 122,
+ .colorspace = V4L2_COLORSPACE_SRGB,},
+#endif
+ { 512, 244, V4L2_PIX_FMT_SGRBG8, V4L2_FIELD_NONE,
+ .bytesperline = 512,
+ .sizeimage = 512 * 244,
+ .colorspace = V4L2_COLORSPACE_SRGB,},
+};
+
+static const struct ctrl sd_ctrls[] = {
+[GAIN] = {
+ {
+ .id = V4L2_CID_GAIN,
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .name = "Gain",
+ .minimum = 0,
+ .maximum = 255,
+ .step = 1,
+ .default_value = 200,
+ },
+ },
+[EXPOSURE] = {
+ {
+ .id = V4L2_CID_EXPOSURE,
+ .type = V4L2_CTRL_TYPE_INTEGER,
+ .name = "Exposure",
+ .minimum = 0,
+ .maximum = 2047,
+ .step = 1,
+ .default_value = 256,
+ },
+ },
+};
+
+static int vicam_control_msg(struct gspca_dev *gspca_dev, u8 request,
+ u16 value, u16 index, u8 *data, u16 len)
+{
+ int ret;
+
+ ret = usb_control_msg(gspca_dev->dev,
+ usb_sndctrlpipe(gspca_dev->dev, 0),
+ request,
+ USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ value, index, data, len, 1000);
+ if (ret < 0)
+ err("control msg req %02X error %d", request, ret);
+
+ return ret;
+}
+
+static int vicam_set_camera_power(struct gspca_dev *gspca_dev, int state)
+{
+ int ret;
+
+ ret = vicam_control_msg(gspca_dev, 0x50, state, 0, NULL, 0);
+ if (ret < 0)
+ return ret;
+
+ if (state)
+ ret = vicam_control_msg(gspca_dev, 0x55, 1, 0, NULL, 0);
+
+ return ret;
+}
+
+/*
+ * request and read a block of data - see warning on vicam_command.
+ */
+static int vicam_read_frame(struct gspca_dev *gspca_dev, u8 *data, int size)
+{
+ struct sd *sd = (struct sd *)gspca_dev;
+ int ret, unscaled_height, act_len = 0;
+ u8 *req_data = gspca_dev->usb_buf;
+
+ memset(req_data, 0, 16);
+ req_data[0] = sd->ctrls[GAIN].val;
+ if (gspca_dev->width == 256)
+ req_data[1] |= 0x01; /* low nibble x-scale */
+ if (gspca_dev->height <= 122) {
+ req_data[1] |= 0x10; /* high nibble y-scale */
+ unscaled_height = gspca_dev->height * 2;
+ } else
+ unscaled_height = gspca_dev->height;
+ req_data[2] = 0x90; /* unknown, does not seem to do anything */
+ if (unscaled_height <= 200)
+ req_data[3] = 0x06; /* vend? */
+ else if (unscaled_height <= 242) /* Yes 242 not 240 */
+ req_data[3] = 0x07; /* vend? */
+ else /* Up to 244 lines with req_data[3] == 0x08 */
+ req_data[3] = 0x08; /* vend? */
+
+ if (sd->ctrls[EXPOSURE].val < 256) {
+ /* Frame rate maxed out, use partial frame expo time */
+ req_data[4] = 255 - sd->ctrls[EXPOSURE].val;
+ req_data[5] = 0x00;
+ req_data[6] = 0x00;
+ req_data[7] = 0x01;
+ } else {
+ /* Modify frame rate */
+ req_data[4] = 0x00;
+ req_data[5] = 0x00;
+ req_data[6] = sd->ctrls[EXPOSURE].val & 0xFF;
+ req_data[7] = sd->ctrls[EXPOSURE].val >> 8;
+ }
+ req_data[8] = ((244 - unscaled_height) / 2) & ~0x01; /* vstart */
+ /* bytes 9-15 do not seem to affect exposure or image quality */
+
+ mutex_lock(&gspca_dev->usb_lock);
+ ret = vicam_control_msg(gspca_dev, 0x51, 0x80, 0, req_data, 16);
+ mutex_unlock(&gspca_dev->usb_lock);
+ if (ret < 0)
+ return ret;
+
+ ret = usb_bulk_msg(gspca_dev->dev,
+ usb_rcvbulkpipe(gspca_dev->dev, 0x81),
+ data, size, &act_len, 10000);
+ /* successful, it returns 0, otherwise negative */
+ if (ret < 0 || act_len != size) {
+ err("bulk read fail (%d) len %d/%d",
+ ret, act_len, size);
+ return -EIO;
+ }
+ return 0;
+}
+
+/* This function is called as a workqueue function and runs whenever the camera
+ * is streaming data. Because it is a workqueue function it is allowed to sleep
+ * so we can use synchronous USB calls. To avoid possible collisions with other
+ * threads attempting to use the camera's USB interface we take the gspca
+ * usb_lock when performing USB operations. In practice the only thing we need
+ * to protect against is the usb_set_interface call that gspca makes during
+ * stream_off as the camera doesn't provide any controls that the user could try
+ * to change.
+ */
+static void vicam_dostream(struct work_struct *work)
+{
+ struct sd *sd = container_of(work, struct sd, work_struct);
+ struct gspca_dev *gspca_dev = &sd->gspca_dev;
+ int ret, frame_sz;
+ u8 *buffer;
+
+ frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage +
+ HEADER_SIZE;
+ buffer = kmalloc(frame_sz, GFP_KERNEL | GFP_DMA);
+ if (!buffer) {
+ err("Couldn't allocate USB buffer");
+ goto exit;
+ }
+
+ while (gspca_dev->present && gspca_dev->streaming) {
+ ret = vicam_read_frame(gspca_dev, buffer, frame_sz);
+ if (ret < 0)
+ break;
+
+ /* Note the frame header contents seem to be completely
+ constant, they do not change with either image, or
+ settings. So we simply discard it. The frames have
+ a very similar 64 byte footer, which we don't even
+ bother reading from the cam */
+ gspca_frame_add(gspca_dev, FIRST_PACKET,
+ buffer + HEADER_SIZE,
+ frame_sz - HEADER_SIZE);
+ gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
+ }
+exit:
+ kfree(buffer);
+}
+
+/* This function is called at probe time just before sd_init */
+static int sd_config(struct gspca_dev *gspca_dev,
+ const struct usb_device_id *id)
+{
+ struct cam *cam = &gspca_dev->cam;
+ struct sd *sd = (struct sd *)gspca_dev;
+
+ /* We don't use the buffer gspca allocates so make it small. */
+ cam->bulk = 1;
+ cam->bulk_size = 64;
+ cam->cam_mode = vicam_mode;
+ cam->nmodes = ARRAY_SIZE(vicam_mode);
+ cam->ctrls = sd->ctrls;
+
+ INIT_WORK(&sd->work_struct, vicam_dostream);
+
+ return 0;
+}
+
+/* this function is called at probe and resume time */
+static int sd_init(struct gspca_dev *gspca_dev)
+{
+ int ret;
+ const struct ihex_binrec *rec;
+ const struct firmware *uninitialized_var(fw);
+ u8 *firmware_buf;
+
+ ret = request_ihex_firmware(&fw, "vicam/firmware.fw",
+ &gspca_dev->dev->dev);
+ if (ret) {
+ err("Failed to load \"vicam/firmware.fw\": %d\n", ret);
+ return ret;
+ }
+
+ firmware_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!firmware_buf) {
+ ret = -ENOMEM;
+ goto exit;
+ }
+ for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
+ memcpy(firmware_buf, rec->data, be16_to_cpu(rec->len));
+ ret = vicam_control_msg(gspca_dev, 0xff, 0, 0, firmware_buf,
+ be16_to_cpu(rec->len));
+ if (ret < 0)
+ break;
+ }
+
+ kfree(firmware_buf);
+exit:
+ release_firmware(fw);
+ return ret;
+}
+
+/* Set up for getting frames. */
+static int sd_start(struct gspca_dev *gspca_dev)
+{
+ struct sd *sd = (struct sd *)gspca_dev;
+ int ret;
+
+ ret = vicam_set_camera_power(gspca_dev, 1);
+ if (ret < 0)
+ return ret;
+
+ /* Start the workqueue function to do the streaming */
+ sd->work_thread = create_singlethread_workqueue(MODULE_NAME);
+ queue_work(sd->work_thread, &sd->work_struct);
+
+ return 0;
+}
+
+/* called on streamoff with alt==0 and on disconnect */
+/* the usb_lock is held at entry - restore on exit */
+static void sd_stop0(struct gspca_dev *gspca_dev)
+{
+ struct sd *dev = (struct sd *)gspca_dev;
+
+ /* wait for the work queue to terminate */
+ mutex_unlock(&gspca_dev->usb_lock);
+ /* This waits for vicam_dostream to finish */
+ destroy_workqueue(dev->work_thread);
+ dev->work_thread = NULL;
+ mutex_lock(&gspca_dev->usb_lock);
+
+ vicam_set_camera_power(gspca_dev, 0);
+}
+
+/* Table of supported USB devices */
+static const struct usb_device_id device_table[] = {
+ {USB_DEVICE(0x04c1, 0x009d)},
+ {USB_DEVICE(0x0602, 0x1001)},
+ {}
+};
+
+MODULE_DEVICE_TABLE(usb, device_table);
+
+/* sub-driver description */
+static const struct sd_desc sd_desc = {
+ .name = MODULE_NAME,
+ .ctrls = sd_ctrls,
+ .nctrls = ARRAY_SIZE(sd_ctrls),
+ .config = sd_config,
+ .init = sd_init,
+ .start = sd_start,
+ .stop0 = sd_stop0,
+};
+
+/* -- device connect -- */
+static int sd_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ return gspca_dev_probe(intf, id,
+ &sd_desc,
+ sizeof(struct sd),
+ THIS_MODULE);
+}
+
+static struct usb_driver sd_driver = {
+ .name = MODULE_NAME,
+ .id_table = device_table,
+ .probe = sd_probe,
+ .disconnect = gspca_disconnect,
+#ifdef CONFIG_PM
+ .suspend = gspca_suspend,
+ .resume = gspca_resume,
+#endif
+};
+
+/* -- module insert / remove -- */
+static int __init sd_mod_init(void)
+{
+ return usb_register(&sd_driver);
+}
+
+static void __exit sd_mod_exit(void)
+{
+ usb_deregister(&sd_driver);
+}
+
+module_init(sd_mod_init);
+module_exit(sd_mod_exit);
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff