V4L/DVB (5863): TCM825x: Add driver.

Add a driver for Toshiba TCM825x VGA camera sensor. This sensor is used
e.g. in Nokia N800 internet tablet.

This driver uses the new V4L2 internal ioctl interface.

Signed-off-by: Sakari Ailus <sakari.ailus@nokia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 942 insertions, 0 deletions

diff --git a/drivers/media/video/tcm825x.c b/drivers/media/video/tcm825x.c
new file mode 100644
index 000000000000..4b973b099e59
--- /dev/null
+++ b/drivers/media/video/tcm825x.c
@@ -0,0 +1,942 @@
+/*
+ * drivers/media/video/tcm825x.c
+ *
+ * TCM825X camera sensor driver.
+ *
+ * Copyright (C) 2007 Nokia Corporation.
+ *
+ * Contact: Sakari Ailus <sakari.ailus@nokia.com>
+ *
+ * Based on code from David Cohen <david.cohen@indt.org.br>
+ *
+ * This driver was based on ov9640 sensor driver from MontaVista
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/i2c.h>
+#include <media/v4l2-int-device.h>
+
+#include "tcm825x.h"
+
+/*
+ * The sensor has two fps modes: the lower one just gives half the fps
+ * at the same xclk than the high one.
+ */
+#define MAX_FPS 30
+#define MIN_FPS 8
+#define MAX_HALF_FPS (MAX_FPS / 2)
+#define HIGH_FPS_MODE_LOWER_LIMIT 14
+#define DEFAULT_FPS MAX_HALF_FPS
+
+struct tcm825x_sensor {
+        const struct tcm825x_platform_data *platform_data;
+        struct v4l2_int_device *v4l2_int_device;
+        struct i2c_client *i2c_client;
+        struct v4l2_pix_format pix;
+        struct v4l2_fract timeperframe;
+};
+
+/* list of image formats supported by TCM825X sensor */
+const static struct v4l2_fmtdesc tcm825x_formats[] = {
+        {
+                .description = "YUYV (YUV 4:2:2), packed",
+                .pixelformat = V4L2_PIX_FMT_UYVY,
+        }, {
+                /* Note:  V4L2 defines RGB565 as:
+                 *
+                 *      Byte 0                    Byte 1
+                 *      g2 g1 g0 r4 r3 r2 r1 r0   b4 b3 b2 b1 b0 g5 g4 g3
+                 *
+                 * We interpret RGB565 as:
+                 *
+                 *      Byte 0                    Byte 1
+                 *      g2 g1 g0 b4 b3 b2 b1 b0   r4 r3 r2 r1 r0 g5 g4 g3
+                 */
+                .description = "RGB565, le",
+                .pixelformat = V4L2_PIX_FMT_RGB565,
+        },
+};
+
+#define TCM825X_NUM_CAPTURE_FORMATS     ARRAY_SIZE(tcm825x_formats)
+
+/*
+ * TCM825X register configuration for all combinations of pixel format and
+ * image size
+ */
+const static struct tcm825x_reg subqcif =       { 0x20, TCM825X_PICSIZ };
+const static struct tcm825x_reg qcif    =       { 0x18, TCM825X_PICSIZ };
+const static struct tcm825x_reg cif     =       { 0x14, TCM825X_PICSIZ };
+const static struct tcm825x_reg qqvga   =       { 0x0c, TCM825X_PICSIZ };
+const static struct tcm825x_reg qvga    =       { 0x04, TCM825X_PICSIZ };
+const static struct tcm825x_reg vga     =       { 0x00, TCM825X_PICSIZ };
+
+const static struct tcm825x_reg yuv422  =       { 0x00, TCM825X_PICFMT };
+const static struct tcm825x_reg rgb565  =       { 0x02, TCM825X_PICFMT };
+
+/* Our own specific controls */
+#define V4L2_CID_ALC                            V4L2_CID_PRIVATE_BASE
+#define V4L2_CID_H_EDGE_EN                      V4L2_CID_PRIVATE_BASE + 1
+#define V4L2_CID_V_EDGE_EN                      V4L2_CID_PRIVATE_BASE + 2
+#define V4L2_CID_LENS                           V4L2_CID_PRIVATE_BASE + 3
+#define V4L2_CID_MAX_EXPOSURE_TIME              V4L2_CID_PRIVATE_BASE + 4
+#define V4L2_CID_LAST_PRIV                      V4L2_CID_MAX_EXPOSURE_TIME
+
+/*  Video controls  */
+static struct vcontrol {
+        struct v4l2_queryctrl qc;
+        u16 reg;
+        u16 start_bit;
+} video_control[] = {
+        {
+                {
+                        .id = V4L2_CID_GAIN,
+                        .type = V4L2_CTRL_TYPE_INTEGER,
+                        .name = "Gain",
+                        .minimum = 0,
+                        .maximum = 63,
+                        .step = 1,
+                },
+                .reg = TCM825X_AG,
+                .start_bit = 0,
+        },
+        {
+                {
+                        .id = V4L2_CID_RED_BALANCE,
+                        .type = V4L2_CTRL_TYPE_INTEGER,
+                        .name = "Red Balance",
+                        .minimum = 0,
+                        .maximum = 255,
+                        .step = 1,
+                },
+                .reg = TCM825X_MRG,
+                .start_bit = 0,
+        },
+        {
+                {
+                        .id = V4L2_CID_BLUE_BALANCE,
+                        .type = V4L2_CTRL_TYPE_INTEGER,
+                        .name = "Blue Balance",
+                        .minimum = 0,
+                        .maximum = 255,
+                        .step = 1,
+                },
+                .reg = TCM825X_MBG,
+                .start_bit = 0,
+        },
+        {
+                {
+                        .id = V4L2_CID_AUTO_WHITE_BALANCE,
+                        .type = V4L2_CTRL_TYPE_BOOLEAN,
+                        .name = "Auto White Balance",
+                        .minimum = 0,
+                        .maximum = 1,
+                        .step = 0,
+                },
+                .reg = TCM825X_AWBSW,
+                .start_bit = 7,
+        },
+        {
+                {
+                        .id = V4L2_CID_EXPOSURE,
+                        .type = V4L2_CTRL_TYPE_INTEGER,
+                        .name = "Exposure Time",
+                        .minimum = 0,
+                        .maximum = 0x1fff,
+                        .step = 1,
+                },
+                .reg = TCM825X_ESRSPD_U,
+                .start_bit = 0,
+        },
+        {
+                {
+                        .id = V4L2_CID_HFLIP,
+                        .type = V4L2_CTRL_TYPE_BOOLEAN,
+                        .name = "Mirror Image",
+                        .minimum = 0,
+                        .maximum = 1,
+                        .step = 0,
+                },
+                .reg = TCM825X_H_INV,
+                .start_bit = 6,
+        },
+        {
+                {
+                        .id = V4L2_CID_VFLIP,
+                        .type = V4L2_CTRL_TYPE_BOOLEAN,
+                        .name = "Vertical Flip",
+                        .minimum = 0,
+                        .maximum = 1,
+                        .step = 0,
+                },
+                .reg = TCM825X_V_INV,
+                .start_bit = 7,
+        },
+        /* Private controls */
+        {
+                {
+                        .id = V4L2_CID_ALC,
+                        .type = V4L2_CTRL_TYPE_BOOLEAN,
+                        .name = "Auto Luminance Control",
+                        .minimum = 0,
+                        .maximum = 1,
+                        .step = 0,
+                },
+                .reg = TCM825X_ALCSW,
+                .start_bit = 7,
+        },
+        {
+                {
+                        .id = V4L2_CID_H_EDGE_EN,
+                        .type = V4L2_CTRL_TYPE_INTEGER,
+                        .name = "Horizontal Edge Enhancement",
+                        .minimum = 0,
+                        .maximum = 0xff,
+                        .step = 1,
+                },
+                .reg = TCM825X_HDTG,
+                .start_bit = 0,
+        },
+        {
+                {
+                        .id = V4L2_CID_V_EDGE_EN,
+                        .type = V4L2_CTRL_TYPE_INTEGER,
+                        .name = "Vertical Edge Enhancement",
+                        .minimum = 0,
+                        .maximum = 0xff,
+                        .step = 1,
+                },
+                .reg = TCM825X_VDTG,
+                .start_bit = 0,
+        },
+        {
+                {
+                        .id = V4L2_CID_LENS,
+                        .type = V4L2_CTRL_TYPE_INTEGER,
+                        .name = "Lens Shading Compensation",
+                        .minimum = 0,
+                        .maximum = 0x3f,
+                        .step = 1,
+                },
+                .reg = TCM825X_LENS,
+                .start_bit = 0,
+        },
+        {
+                {
+                        .id = V4L2_CID_MAX_EXPOSURE_TIME,
+                        .type = V4L2_CTRL_TYPE_INTEGER,
+                        .name = "Maximum Exposure Time",
+                        .minimum = 0,
+                        .maximum = 0x3,
+                        .step = 1,
+                },
+                .reg = TCM825X_ESRLIM,
+                .start_bit = 5,
+        },
+};
+
+
+const static struct tcm825x_reg *tcm825x_siz_reg[NUM_IMAGE_SIZES] =
+{ &subqcif, &qqvga, &qcif, &qvga, &cif, &vga };
+
+const static struct tcm825x_reg *tcm825x_fmt_reg[NUM_PIXEL_FORMATS] =
+{ &yuv422, &rgb565 };
+
+/*
+ * Read a value from a register in an TCM825X sensor device.  The value is
+ * returned in 'val'.
+ * Returns zero if successful, or non-zero otherwise.
+ */
+static int tcm825x_read_reg(struct i2c_client *client, int reg)
+{
+        int err;
+        struct i2c_msg msg[2];
+        u8 reg_buf, data_buf = 0;
+
+        if (!client->adapter)
+                return -ENODEV;
+
+        msg[0].addr = client->addr;
+        msg[0].flags = 0;
+        msg[0].len = 1;
+        msg[0].buf = &reg_buf;
+        msg[1].addr = client->addr;
+        msg[1].flags = I2C_M_RD;
+        msg[1].len = 1;
+        msg[1].buf = &data_buf;
+
+        reg_buf = reg;
+
+        err = i2c_transfer(client->adapter, msg, 2);
+        if (err < 0)
+                return err;
+        return data_buf;
+}
+
+/*
+ * Write a value to a register in an TCM825X sensor device.
+ * Returns zero if successful, or non-zero otherwise.
+ */
+static int tcm825x_write_reg(struct i2c_client *client, u8 reg, u8 val)
+{
+        int err;
+        struct i2c_msg msg[1];
+        unsigned char data[2];
+
+        if (!client->adapter)
+                return -ENODEV;
+
+        msg->addr = client->addr;
+        msg->flags = 0;
+        msg->len = 2;
+        msg->buf = data;
+        data[0] = reg;
+        data[1] = val;
+        err = i2c_transfer(client->adapter, msg, 1);
+        if (err >= 0)
+                return 0;
+        return err;
+}
+
+static int __tcm825x_write_reg_mask(struct i2c_client *client,
+                                    u8 reg, u8 val, u8 mask)
+{
+        int rc;
+
+        /* need to do read - modify - write */
+        rc = tcm825x_read_reg(client, reg);
+        if (rc < 0)
+                return rc;
+
+        rc &= (~mask);  /* Clear the masked bits */
+        val &= mask;    /* Enforce mask on value */
+        val |= rc;
+
+        /* write the new value to the register */
+        rc = tcm825x_write_reg(client, reg, val);
+        if (rc)
+                return rc;
+
+        return 0;
+}
+
+#define tcm825x_write_reg_mask(client, regmask, val)                    \
+        __tcm825x_write_reg_mask(client, TCM825X_ADDR((regmask)), val,  \
+                                 TCM825X_MASK((regmask)))
+
+
+/*
+ * Initialize a list of TCM825X registers.
+ * The list of registers is terminated by the pair of values
+ * { TCM825X_REG_TERM, TCM825X_VAL_TERM }.
+ * Returns zero if successful, or non-zero otherwise.
+ */
+static int tcm825x_write_default_regs(struct i2c_client *client,
+                                      const struct tcm825x_reg *reglist)
+{
+        int err;
+        const struct tcm825x_reg *next = reglist;
+
+        while (!((next->reg == TCM825X_REG_TERM)
+                 && (next->val == TCM825X_VAL_TERM))) {
+                err = tcm825x_write_reg(client, next->reg, next->val);
+                if (err) {
+                        dev_err(&client->dev, "register writing failed\n");
+                        return err;
+                }
+                next++;
+        }
+
+        return 0;
+}
+
+static struct vcontrol *find_vctrl(int id)
+{
+        int i;
+
+        if (id < V4L2_CID_BASE)
+                return NULL;
+
+        for (i = 0; i < ARRAY_SIZE(video_control); i++)
+                if (video_control[i].qc.id == id)
+                        return &video_control[i];
+
+        return NULL;
+}
+
+/*
+ * Find the best match for a requested image capture size.  The best match
+ * is chosen as the nearest match that has the same number or fewer pixels
+ * as the requested size, or the smallest image size if the requested size
+ * has fewer pixels than the smallest image.
+ */
+static enum image_size tcm825x_find_size(struct v4l2_int_device *s,
+                                         unsigned int width,
+                                         unsigned int height)
+{
+        enum image_size isize;
+        unsigned long pixels = width * height;
+        struct tcm825x_sensor *sensor = s->priv;
+
+        for (isize = subQCIF; isize < VGA; isize++) {
+                if (tcm825x_sizes[isize + 1].height
+                    * tcm825x_sizes[isize + 1].width > pixels) {
+                        dev_dbg(&sensor->i2c_client->dev, "size %d\n", isize);
+
+                        return isize;
+                }
+        }
+
+        dev_dbg(&sensor->i2c_client->dev, "format default VGA\n");
+
+        return VGA;
+}
+
+/*
+ * Configure the TCM825X for current image size, pixel format, and
+ * frame period. fper is the frame period (in seconds) expressed as a
+ * fraction. Returns zero if successful, or non-zero otherwise. The
+ * actual frame period is returned in fper.
+ */
+static int tcm825x_configure(struct v4l2_int_device *s)
+{
+        struct tcm825x_sensor *sensor = s->priv;
+        struct v4l2_pix_format *pix = &sensor->pix;
+        enum image_size isize = tcm825x_find_size(s, pix->width, pix->height);
+        struct v4l2_fract *fper = &sensor->timeperframe;
+        enum pixel_format pfmt;
+        int err;
+        u32 tgt_fps;
+        u8 val;
+
+        /* common register initialization */
+        err = tcm825x_write_default_regs(
+                sensor->i2c_client, sensor->platform_data->default_regs());
+        if (err)
+                return err;
+
+        /* configure image size */
+        val = tcm825x_siz_reg[isize]->val;
+        dev_dbg(&sensor->i2c_client->dev,
+                "configuring image size %d\n", isize);
+        err = tcm825x_write_reg_mask(sensor->i2c_client,
+                                     tcm825x_siz_reg[isize]->reg, val);
+        if (err)
+                return err;
+
+        /* configure pixel format */
+        switch (pix->pixelformat) {
+        default:
+        case V4L2_PIX_FMT_RGB565:
+                pfmt = RGB565;
+                break;
+        case V4L2_PIX_FMT_UYVY:
+                pfmt = YUV422;
+                break;
+        }
+
+        dev_dbg(&sensor->i2c_client->dev,
+                "configuring pixel format %d\n", pfmt);
+        val = tcm825x_fmt_reg[pfmt]->val;
+
+        err = tcm825x_write_reg_mask(sensor->i2c_client,
+                                     tcm825x_fmt_reg[pfmt]->reg, val);
+        if (err)
+                return err;
+
+        /*
+         * For frame rate < 15, the FPS reg (addr 0x02, bit 7) must be
+         * set. Frame rate will be halved from the normal.
+         */
+        tgt_fps = fper->denominator / fper->numerator;
+        if (tgt_fps <= HIGH_FPS_MODE_LOWER_LIMIT) {
+                val = tcm825x_read_reg(sensor->i2c_client, 0x02);
+                val |= 0x80;
+                tcm825x_write_reg(sensor->i2c_client, 0x02, val);
+        }
+
+        return 0;
+}
+
+/*
+ * Given the image capture format in pix, the nominal frame period in
+ * timeperframe, calculate the required xclk frequency.
+ *
+ * TCM825X input frequency characteristics are:
+ *     Minimum 11.9 MHz, Typical 24.57 MHz and maximum 25/27 MHz
+ */
+#define XCLK_MIN 11900000
+#define XCLK_MAX 25000000
+
+static int ioctl_g_ext_clk(struct v4l2_int_device *s, u32 *xclk)
+{
+        struct tcm825x_sensor *sensor = s->priv;
+        struct v4l2_fract *timeperframe = &sensor->timeperframe;
+        u32 tgt_xclk;   /* target xclk */
+        u32 tgt_fps;    /* target frames per secound */
+
+        tgt_fps = timeperframe->denominator / timeperframe->numerator;
+
+        tgt_xclk = (tgt_fps <= HIGH_FPS_MODE_LOWER_LIMIT) ?
+                (2457 * tgt_fps) / MAX_HALF_FPS :
+                (2457 * tgt_fps) / MAX_FPS;
+        tgt_xclk *= 10000;
+
+        tgt_xclk = min(tgt_xclk, (u32)XCLK_MAX);
+        tgt_xclk = max(tgt_xclk, (u32)XCLK_MIN);
+
+        *xclk = tgt_xclk;
+
+        return 0;
+}
+
+static int ioctl_s_ext_clk(struct v4l2_int_device *s, u32 xclk)
+{
+        if (xclk > XCLK_MAX || xclk < XCLK_MIN)
+                return -EINVAL;
+
+        return 0;
+}
+
+static int ioctl_queryctrl(struct v4l2_int_device *s,
+                                struct v4l2_queryctrl *qc)
+{
+        struct vcontrol *control;
+
+        control = find_vctrl(qc->id);
+
+        if (control == NULL)
+                return -EINVAL;
+
+        *qc = control->qc;
+
+        return 0;
+}
+
+static int ioctl_g_ctrl(struct v4l2_int_device *s,
+                             struct v4l2_control *vc)
+{
+        struct tcm825x_sensor *sensor = s->priv;
+        struct i2c_client *client = sensor->i2c_client;
+        int val, r;
+        struct vcontrol *lvc;
+
+        /* exposure time is special, spread accross 2 registers */
+        if (vc->id == V4L2_CID_EXPOSURE) {
+                int val_lower, val_upper;
+
+                val_upper = tcm825x_read_reg(client,
+                                             TCM825X_ADDR(TCM825X_ESRSPD_U));
+                if (val_upper < 0)
+                        return val_upper;
+                val_lower = tcm825x_read_reg(client,
+                                             TCM825X_ADDR(TCM825X_ESRSPD_L));
+                if (val_lower < 0)
+                        return val_lower;
+
+                vc->value = ((val_upper & 0x1f) << 8) | (val_lower);
+                return 0;
+        }
+
+        lvc = find_vctrl(vc->id);
+        if (lvc == NULL)
+                return -EINVAL;
+
+        r = tcm825x_read_reg(client, TCM825X_ADDR(lvc->reg));
+        if (r < 0)
+                return r;
+        val = r & TCM825X_MASK(lvc->reg);
+        val >>= lvc->start_bit;
+
+        if (val < 0)
+                return val;
+
+        vc->value = val;
+        return 0;
+}
+
+static int ioctl_s_ctrl(struct v4l2_int_device *s,
+                             struct v4l2_control *vc)
+{
+        struct tcm825x_sensor *sensor = s->priv;
+        struct i2c_client *client = sensor->i2c_client;
+        struct vcontrol *lvc;
+        int val = vc->value;
+
+        /* exposure time is special, spread accross 2 registers */
+        if (vc->id == V4L2_CID_EXPOSURE) {
+                int val_lower, val_upper;
+                val_lower = val & TCM825X_MASK(TCM825X_ESRSPD_L);
+                val_upper = (val >> 8) & TCM825X_MASK(TCM825X_ESRSPD_U);
+
+                if (tcm825x_write_reg_mask(client,
+                                           TCM825X_ESRSPD_U, val_upper))
+                        return -EIO;
+
+                if (tcm825x_write_reg_mask(client,
+                                           TCM825X_ESRSPD_L, val_lower))
+                        return -EIO;
+
+                return 0;
+        }
+
+        lvc = find_vctrl(vc->id);
+        if (lvc == NULL)
+                return -EINVAL;
+
+        val = val << lvc->start_bit;
+        if (tcm825x_write_reg_mask(client, lvc->reg, val))
+                return -EIO;
+
+        return 0;
+}
+
+static int ioctl_enum_fmt_cap(struct v4l2_int_device *s,
+                                   struct v4l2_fmtdesc *fmt)
+{
+        int index = fmt->index;
+
+        switch (fmt->type) {
+        case V4L2_BUF_TYPE_VIDEO_CAPTURE:
+                if (index >= TCM825X_NUM_CAPTURE_FORMATS)
+                        return -EINVAL;
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        fmt->flags = tcm825x_formats[index].flags;
+        strlcpy(fmt->description, tcm825x_formats[index].description,
+                sizeof(fmt->description));
+        fmt->pixelformat = tcm825x_formats[index].pixelformat;
+
+        return 0;
+}
+
+static int ioctl_try_fmt_cap(struct v4l2_int_device *s,
+                             struct v4l2_format *f)
+{
+        struct tcm825x_sensor *sensor = s->priv;
+        enum image_size isize;
+        int ifmt;
+        struct v4l2_pix_format *pix = &f->fmt.pix;
+
+        isize = tcm825x_find_size(s, pix->width, pix->height);
+        dev_dbg(&sensor->i2c_client->dev, "isize = %d num_capture = %d\n",
+                isize, TCM825X_NUM_CAPTURE_FORMATS);
+
+        pix->width = tcm825x_sizes[isize].width;
+        pix->height = tcm825x_sizes[isize].height;
+
+        for (ifmt = 0; ifmt < TCM825X_NUM_CAPTURE_FORMATS; ifmt++)
+                if (pix->pixelformat == tcm825x_formats[ifmt].pixelformat)
+                        break;
+
+        if (ifmt == TCM825X_NUM_CAPTURE_FORMATS)
+                ifmt = 0;       /* Default = YUV 4:2:2 */
+
+        pix->pixelformat = tcm825x_formats[ifmt].pixelformat;
+        pix->field = V4L2_FIELD_NONE;
+        pix->bytesperline = pix->width * TCM825X_BYTES_PER_PIXEL;
+        pix->sizeimage = pix->bytesperline * pix->height;
+        pix->priv = 0;
+        dev_dbg(&sensor->i2c_client->dev, "format = 0x%08x\n",
+                pix->pixelformat);
+
+        switch (pix->pixelformat) {
+        case V4L2_PIX_FMT_UYVY:
+        default:
+                pix->colorspace = V4L2_COLORSPACE_JPEG;
+                break;
+        case V4L2_PIX_FMT_RGB565:
+                pix->colorspace = V4L2_COLORSPACE_SRGB;
+                break;
+        }
+
+        return 0;
+}
+
+static int ioctl_s_fmt_cap(struct v4l2_int_device *s,
+                                struct v4l2_format *f)
+{
+        struct tcm825x_sensor *sensor = s->priv;
+        struct v4l2_pix_format *pix = &f->fmt.pix;
+        int rval;
+
+        rval = ioctl_try_fmt_cap(s, f);
+        if (rval)
+                return rval;
+
+        rval = tcm825x_configure(s);
+
+        sensor->pix = *pix;
+
+        return rval;
+}
+
+static int ioctl_g_fmt_cap(struct v4l2_int_device *s,
+                                struct v4l2_format *f)
+{
+        struct tcm825x_sensor *sensor = s->priv;
+
+        f->fmt.pix = sensor->pix;
+
+        return 0;
+}
+
+static int ioctl_g_parm(struct v4l2_int_device *s,
+                             struct v4l2_streamparm *a)
+{
+        struct tcm825x_sensor *sensor = s->priv;
+        struct v4l2_captureparm *cparm = &a->parm.capture;
+
+        if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+                return -EINVAL;
+
+        memset(a, 0, sizeof(*a));
+        a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+
+        cparm->capability = V4L2_CAP_TIMEPERFRAME;
+        cparm->timeperframe = sensor->timeperframe;
+
+        return 0;
+}
+
+static int ioctl_s_parm(struct v4l2_int_device *s,
+                             struct v4l2_streamparm *a)
+{
+        struct tcm825x_sensor *sensor = s->priv;
+        struct v4l2_fract *timeperframe = &a->parm.capture.timeperframe;
+        u32 tgt_fps;    /* target frames per secound */
+        int rval;
+
+        if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+                return -EINVAL;
+
+        if ((timeperframe->numerator == 0)
+            || (timeperframe->denominator == 0)) {
+                timeperframe->denominator = DEFAULT_FPS;
+                timeperframe->numerator = 1;
+        }
+
+        tgt_fps = timeperframe->denominator / timeperframe->numerator;
+
+        if (tgt_fps > MAX_FPS) {
+                timeperframe->denominator = MAX_FPS;
+                timeperframe->numerator = 1;
+        } else if (tgt_fps < MIN_FPS) {
+                timeperframe->denominator = MIN_FPS;
+                timeperframe->numerator = 1;
+        }
+
+        sensor->timeperframe = *timeperframe;
+
+        rval = tcm825x_configure(s);
+
+        return rval;
+}
+
+static int ioctl_s_power(struct v4l2_int_device *s, int on)
+{
+        struct tcm825x_sensor *sensor = s->priv;
+
+        return sensor->platform_data->power_set(on);
+}
+
+static int ioctl_g_needs_reset(struct v4l2_int_device *s, void *buf)
+{
+        struct tcm825x_sensor *sensor = s->priv;
+
+        return sensor->platform_data->needs_reset(s, buf, &sensor->pix);
+}
+
+static int ioctl_reset(struct v4l2_int_device *s)
+{
+        return -EBUSY;
+}
+
+static int ioctl_init(struct v4l2_int_device *s)
+{
+        return tcm825x_configure(s);
+}
+
+static int ioctl_dev_exit(struct v4l2_int_device *s)
+{
+        return 0;
+}
+
+static int ioctl_dev_init(struct v4l2_int_device *s)
+{
+        struct tcm825x_sensor *sensor = s->priv;
+        int r;
+
+        r = tcm825x_read_reg(sensor->i2c_client, 0x01);
+        if (r < 0)
+                return r;
+        if (r == 0) {
+                dev_err(&sensor->i2c_client->dev, "device not detected\n");
+                return -EIO;
+        }
+        return 0;
+}
+
+#define NUM_IOCTLS 17
+
+static struct v4l2_int_ioctl_desc tcm825x_ioctl_desc[NUM_IOCTLS] = {
+        { vidioc_int_dev_init_num,
+          (v4l2_int_ioctl_func *)&ioctl_dev_init },
+        { vidioc_int_dev_exit_num,
+          (v4l2_int_ioctl_func *)&ioctl_dev_exit },
+        { vidioc_int_s_power_num,
+          (v4l2_int_ioctl_func *)&ioctl_s_power },
+        { vidioc_int_g_ext_clk_num,
+          (v4l2_int_ioctl_func *)&ioctl_g_ext_clk },
+        { vidioc_int_s_ext_clk_num,
+          (v4l2_int_ioctl_func *)&ioctl_s_ext_clk },
+        { vidioc_int_g_needs_reset_num,
+          (v4l2_int_ioctl_func *)&ioctl_g_needs_reset },
+        { vidioc_int_reset_num,
+          (v4l2_int_ioctl_func *)&ioctl_reset },
+        { vidioc_int_init_num,
+          (v4l2_int_ioctl_func *)&ioctl_init },
+        { vidioc_int_enum_fmt_cap_num,
+          (v4l2_int_ioctl_func *)&ioctl_enum_fmt_cap },
+        { vidioc_int_try_fmt_cap_num,
+          (v4l2_int_ioctl_func *)&ioctl_try_fmt_cap },
+        { vidioc_int_g_fmt_cap_num,
+          (v4l2_int_ioctl_func *)&ioctl_g_fmt_cap },
+        { vidioc_int_s_fmt_cap_num,
+          (v4l2_int_ioctl_func *)&ioctl_s_fmt_cap },
+        { vidioc_int_g_parm_num,
+          (v4l2_int_ioctl_func *)&ioctl_g_parm },
+        { vidioc_int_s_parm_num,
+          (v4l2_int_ioctl_func *)&ioctl_s_parm },
+        { vidioc_int_queryctrl_num,
+          (v4l2_int_ioctl_func *)&ioctl_queryctrl },
+        { vidioc_int_g_ctrl_num,
+          (v4l2_int_ioctl_func *)&ioctl_g_ctrl },
+        { vidioc_int_s_ctrl_num,
+          (v4l2_int_ioctl_func *)&ioctl_s_ctrl },
+};
+
+static struct v4l2_int_slave tcm825x_slave = {
+        .ioctls = tcm825x_ioctl_desc,
+        .num_ioctls = ARRAY_SIZE(tcm825x_ioctl_desc),
+};
+
+static struct tcm825x_sensor tcm825x;
+
+static struct v4l2_int_device tcm825x_int_device = {
+        .module = THIS_MODULE,
+        .name = TCM825X_NAME,
+        .priv = &tcm825x,
+        .type = v4l2_int_type_slave,
+        .u = {
+                .slave = &tcm825x_slave,
+        },
+};
+
+static int tcm825x_probe(struct i2c_client *client)
+{
+        struct tcm825x_sensor *sensor = &tcm825x;
+        int rval;
+
+        if (i2c_get_clientdata(client))
+                return -EBUSY;
+
+        sensor->platform_data = client->dev.platform_data;
+
+        if (sensor->platform_data == NULL
+            && !sensor->platform_data->is_okay())
+                return -ENODEV;
+
+        sensor->v4l2_int_device = &tcm825x_int_device;
+
+        sensor->i2c_client = client;
+        i2c_set_clientdata(client, sensor);
+
+        /* Make the default capture format QVGA RGB565 */
+        sensor->pix.width = tcm825x_sizes[QVGA].width;
+        sensor->pix.height = tcm825x_sizes[QVGA].height;
+        sensor->pix.pixelformat = V4L2_PIX_FMT_RGB565;
+
+        rval = v4l2_int_device_register(sensor->v4l2_int_device);
+        if (rval)
+                i2c_set_clientdata(client, NULL);
+
+        return rval;
+}
+
+static int __exit tcm825x_remove(struct i2c_client *client)
+{
+        struct tcm825x_sensor *sensor = i2c_get_clientdata(client);
+
+        if (!client->adapter)
+                return -ENODEV; /* our client isn't attached */
+
+        v4l2_int_device_unregister(sensor->v4l2_int_device);
+        i2c_set_clientdata(client, NULL);
+
+        return 0;
+}
+
+static struct i2c_driver tcm825x_i2c_driver = {
+        .driver = {
+                .name = TCM825X_NAME,
+        },
+        .probe = &tcm825x_probe,
+        .remove = __exit_p(&tcm825x_remove),
+};
+
+static struct tcm825x_sensor tcm825x = {
+        .timeperframe = {
+                .numerator = 1,
+                .denominator = DEFAULT_FPS,
+        },
+};
+
+static int __init tcm825x_init(void)
+{
+        int rval;
+        int i = 0;
+
+        /* Just an experiment --- don't use *_cb functions yet. */
+        tcm825x_ioctl_desc[i++] = vidioc_int_dev_init_cb(&ioctl_dev_init);
+        BUG_ON(i >= NUM_IOCTLS);
+
+        rval = i2c_add_driver(&tcm825x_i2c_driver);
+        if (rval)
+                printk(KERN_INFO "%s: failed registering " TCM825X_NAME "\n",
+                       __FUNCTION__);
+
+        return rval;
+}
+
+static void __exit tcm825x_exit(void)
+{
+        i2c_del_driver(&tcm825x_i2c_driver);
+}
+
+/*
+ * FIXME: Menelaus isn't ready (?) at module_init stage, so use
+ * late_initcall for now.
+ */
+late_initcall(tcm825x_init);
+module_exit(tcm825x_exit);
+
+MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>");
+MODULE_DESCRIPTION("TCM825x camera sensor driver");
+MODULE_LICENSE("GPL");