[media] gspca: Add new vicam subdriver

This is a complete rewrite of the old v4l1 vicam subdriver, featuring
multiple resolutions, gain + exposure control and still has less code.

Oh and it is a v4l2 driver rather then v4l1 ofcourse :)

Many thanks to Devin Heitmueller <dheitmueller@kernellabs.com> for
donating his 3com homeconnect to me, which made this rewrite possible.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 393 insertions, 0 deletions

diff --git a/drivers/media/video/gspca/Kconfig b/drivers/media/video/gspca/Kconfig
index dda56ff834f..a20f6ae8825 100644
--- a/drivers/media/video/gspca/Kconfig
+++ b/drivers/media/video/gspca/Kconfig
@@ -346,6 +346,16 @@ config USB_GSPCA_VC032X
           To compile this driver as a module, choose M here: the
           module will be called gspca_vc032x.
 
+config USB_GSPCA_VICAM
+        tristate "ViCam USB Camera Driver"
+        depends on VIDEO_V4L2 && USB_GSPCA
+        help
+          Say Y here if you want support for the 3com homeconnect camera
+          (vicam).
+
+          To compile this driver as a module, choose M here: the
+          module will be called gspca_vicam.
+
 config USB_GSPCA_XIRLINK_CIT
         tristate "Xirlink C-It USB Camera Driver"
         depends on VIDEO_V4L2 && USB_GSPCA
diff --git a/drivers/media/video/gspca/Makefile b/drivers/media/video/gspca/Makefile
index 24e695b8b07..a0dbcfbab29 100644
--- a/drivers/media/video/gspca/Makefile
+++ b/drivers/media/video/gspca/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_USB_GSPCA_STV0680)  += gspca_stv0680.o
 obj-$(CONFIG_USB_GSPCA_T613)     += gspca_t613.o
 obj-$(CONFIG_USB_GSPCA_TV8532)   += gspca_tv8532.o
 obj-$(CONFIG_USB_GSPCA_VC032X)   += gspca_vc032x.o
+obj-$(CONFIG_USB_GSPCA_VICAM)    += gspca_vicam.o
 obj-$(CONFIG_USB_GSPCA_XIRLINK_CIT) += gspca_xirlink_cit.o
 obj-$(CONFIG_USB_GSPCA_ZC3XX)    += gspca_zc3xx.o
 
@@ -73,6 +74,7 @@ gspca_sunplus-objs  := sunplus.o
 gspca_t613-objs     := t613.o
 gspca_tv8532-objs   := tv8532.o
 gspca_vc032x-objs   := vc032x.o
+gspca_vicam-objs    := vicam.o
 gspca_xirlink_cit-objs := xirlink_cit.o
 gspca_zc3xx-objs    := zc3xx.o
 
diff --git a/drivers/media/video/gspca/vicam.c b/drivers/media/video/gspca/vicam.c
new file mode 100644
index 00000000000..84dfbab923b
--- /dev/null
+++ b/drivers/media/video/gspca/vicam.c
@@ -0,0 +1,381 @@
+/*
+ * 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);