2 * drivers/media/i2c/tcm825x.c
4 * TCM825X camera sensor driver.
6 * Copyright (C) 2007 Nokia Corporation.
8 * Contact: Sakari Ailus <sakari.ailus@nokia.com>
10 * Based on code from David Cohen <david.cohen@indt.org.br>
12 * This driver was based on ov9640 sensor driver from MontaVista
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * version 2 as published by the Free Software Foundation.
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
29 #include <linux/i2c.h>
30 #include <linux/module.h>
31 #include "v4l2-int-device.h"
36 * The sensor has two fps modes: the lower one just gives half the fps
37 * at the same xclk than the high one.
41 #define MAX_HALF_FPS (MAX_FPS / 2)
42 #define HIGH_FPS_MODE_LOWER_LIMIT 14
43 #define DEFAULT_FPS MAX_HALF_FPS
45 struct tcm825x_sensor {
46 const struct tcm825x_platform_data *platform_data;
47 struct v4l2_int_device *v4l2_int_device;
48 struct i2c_client *i2c_client;
49 struct v4l2_pix_format pix;
50 struct v4l2_fract timeperframe;
53 /* list of image formats supported by TCM825X sensor */
54 static const struct v4l2_fmtdesc tcm825x_formats[] = {
56 .description = "YUYV (YUV 4:2:2), packed",
57 .pixelformat = V4L2_PIX_FMT_UYVY,
59 /* Note: V4L2 defines RGB565 as:
62 * g2 g1 g0 r4 r3 r2 r1 r0 b4 b3 b2 b1 b0 g5 g4 g3
64 * We interpret RGB565 as:
67 * g2 g1 g0 b4 b3 b2 b1 b0 r4 r3 r2 r1 r0 g5 g4 g3
69 .description = "RGB565, le",
70 .pixelformat = V4L2_PIX_FMT_RGB565,
74 #define TCM825X_NUM_CAPTURE_FORMATS ARRAY_SIZE(tcm825x_formats)
77 * TCM825X register configuration for all combinations of pixel format and
80 static const struct tcm825x_reg subqcif = { 0x20, TCM825X_PICSIZ };
81 static const struct tcm825x_reg qcif = { 0x18, TCM825X_PICSIZ };
82 static const struct tcm825x_reg cif = { 0x14, TCM825X_PICSIZ };
83 static const struct tcm825x_reg qqvga = { 0x0c, TCM825X_PICSIZ };
84 static const struct tcm825x_reg qvga = { 0x04, TCM825X_PICSIZ };
85 static const struct tcm825x_reg vga = { 0x00, TCM825X_PICSIZ };
87 static const struct tcm825x_reg yuv422 = { 0x00, TCM825X_PICFMT };
88 static const struct tcm825x_reg rgb565 = { 0x02, TCM825X_PICFMT };
90 /* Our own specific controls */
91 #define V4L2_CID_ALC V4L2_CID_PRIVATE_BASE
92 #define V4L2_CID_H_EDGE_EN (V4L2_CID_PRIVATE_BASE + 1)
93 #define V4L2_CID_V_EDGE_EN (V4L2_CID_PRIVATE_BASE + 2)
94 #define V4L2_CID_LENS (V4L2_CID_PRIVATE_BASE + 3)
95 #define V4L2_CID_MAX_EXPOSURE_TIME (V4L2_CID_PRIVATE_BASE + 4)
96 #define V4L2_CID_LAST_PRIV V4L2_CID_MAX_EXPOSURE_TIME
99 static struct vcontrol {
100 struct v4l2_queryctrl qc;
103 } video_control[] = {
107 .type = V4L2_CTRL_TYPE_INTEGER,
118 .id = V4L2_CID_RED_BALANCE,
119 .type = V4L2_CTRL_TYPE_INTEGER,
120 .name = "Red Balance",
130 .id = V4L2_CID_BLUE_BALANCE,
131 .type = V4L2_CTRL_TYPE_INTEGER,
132 .name = "Blue Balance",
142 .id = V4L2_CID_AUTO_WHITE_BALANCE,
143 .type = V4L2_CTRL_TYPE_BOOLEAN,
144 .name = "Auto White Balance",
149 .reg = TCM825X_AWBSW,
154 .id = V4L2_CID_EXPOSURE,
155 .type = V4L2_CTRL_TYPE_INTEGER,
156 .name = "Exposure Time",
161 .reg = TCM825X_ESRSPD_U,
166 .id = V4L2_CID_HFLIP,
167 .type = V4L2_CTRL_TYPE_BOOLEAN,
168 .name = "Mirror Image",
173 .reg = TCM825X_H_INV,
178 .id = V4L2_CID_VFLIP,
179 .type = V4L2_CTRL_TYPE_BOOLEAN,
180 .name = "Vertical Flip",
185 .reg = TCM825X_V_INV,
188 /* Private controls */
192 .type = V4L2_CTRL_TYPE_BOOLEAN,
193 .name = "Auto Luminance Control",
198 .reg = TCM825X_ALCSW,
203 .id = V4L2_CID_H_EDGE_EN,
204 .type = V4L2_CTRL_TYPE_INTEGER,
205 .name = "Horizontal Edge Enhancement",
215 .id = V4L2_CID_V_EDGE_EN,
216 .type = V4L2_CTRL_TYPE_INTEGER,
217 .name = "Vertical Edge Enhancement",
228 .type = V4L2_CTRL_TYPE_INTEGER,
229 .name = "Lens Shading Compensation",
239 .id = V4L2_CID_MAX_EXPOSURE_TIME,
240 .type = V4L2_CTRL_TYPE_INTEGER,
241 .name = "Maximum Exposure Time",
246 .reg = TCM825X_ESRLIM,
252 static const struct tcm825x_reg *tcm825x_siz_reg[NUM_IMAGE_SIZES] = {
253 &subqcif, &qqvga, &qcif, &qvga, &cif, &vga };
255 static const struct tcm825x_reg *tcm825x_fmt_reg[NUM_PIXEL_FORMATS] = {
259 * Read a value from a register in an TCM825X sensor device. The value is
261 * Returns zero if successful, or non-zero otherwise.
263 static int tcm825x_read_reg(struct i2c_client *client, int reg)
266 struct i2c_msg msg[2];
267 u8 reg_buf, data_buf = 0;
269 if (!client->adapter)
272 msg[0].addr = client->addr;
275 msg[0].buf = ®_buf;
276 msg[1].addr = client->addr;
277 msg[1].flags = I2C_M_RD;
279 msg[1].buf = &data_buf;
283 err = i2c_transfer(client->adapter, msg, 2);
290 * Write a value to a register in an TCM825X sensor device.
291 * Returns zero if successful, or non-zero otherwise.
293 static int tcm825x_write_reg(struct i2c_client *client, u8 reg, u8 val)
296 struct i2c_msg msg[1];
297 unsigned char data[2];
299 if (!client->adapter)
302 msg->addr = client->addr;
308 err = i2c_transfer(client->adapter, msg, 1);
314 static int __tcm825x_write_reg_mask(struct i2c_client *client,
315 u8 reg, u8 val, u8 mask)
319 /* need to do read - modify - write */
320 rc = tcm825x_read_reg(client, reg);
324 rc &= (~mask); /* Clear the masked bits */
325 val &= mask; /* Enforce mask on value */
328 /* write the new value to the register */
329 rc = tcm825x_write_reg(client, reg, val);
336 #define tcm825x_write_reg_mask(client, regmask, val) \
337 __tcm825x_write_reg_mask(client, TCM825X_ADDR((regmask)), val, \
338 TCM825X_MASK((regmask)))
342 * Initialize a list of TCM825X registers.
343 * The list of registers is terminated by the pair of values
344 * { TCM825X_REG_TERM, TCM825X_VAL_TERM }.
345 * Returns zero if successful, or non-zero otherwise.
347 static int tcm825x_write_default_regs(struct i2c_client *client,
348 const struct tcm825x_reg *reglist)
351 const struct tcm825x_reg *next = reglist;
353 while (!((next->reg == TCM825X_REG_TERM)
354 && (next->val == TCM825X_VAL_TERM))) {
355 err = tcm825x_write_reg(client, next->reg, next->val);
357 dev_err(&client->dev, "register writing failed\n");
366 static struct vcontrol *find_vctrl(int id)
370 if (id < V4L2_CID_BASE)
373 for (i = 0; i < ARRAY_SIZE(video_control); i++)
374 if (video_control[i].qc.id == id)
375 return &video_control[i];
381 * Find the best match for a requested image capture size. The best match
382 * is chosen as the nearest match that has the same number or fewer pixels
383 * as the requested size, or the smallest image size if the requested size
384 * has fewer pixels than the smallest image.
386 static enum image_size tcm825x_find_size(struct v4l2_int_device *s,
390 enum image_size isize;
391 unsigned long pixels = width * height;
392 struct tcm825x_sensor *sensor = s->priv;
394 for (isize = subQCIF; isize < VGA; isize++) {
395 if (tcm825x_sizes[isize + 1].height
396 * tcm825x_sizes[isize + 1].width > pixels) {
397 dev_dbg(&sensor->i2c_client->dev, "size %d\n", isize);
403 dev_dbg(&sensor->i2c_client->dev, "format default VGA\n");
409 * Configure the TCM825X for current image size, pixel format, and
410 * frame period. fper is the frame period (in seconds) expressed as a
411 * fraction. Returns zero if successful, or non-zero otherwise. The
412 * actual frame period is returned in fper.
414 static int tcm825x_configure(struct v4l2_int_device *s)
416 struct tcm825x_sensor *sensor = s->priv;
417 struct v4l2_pix_format *pix = &sensor->pix;
418 enum image_size isize = tcm825x_find_size(s, pix->width, pix->height);
419 struct v4l2_fract *fper = &sensor->timeperframe;
420 enum pixel_format pfmt;
425 /* common register initialization */
426 err = tcm825x_write_default_regs(
427 sensor->i2c_client, sensor->platform_data->default_regs());
431 /* configure image size */
432 val = tcm825x_siz_reg[isize]->val;
433 dev_dbg(&sensor->i2c_client->dev,
434 "configuring image size %d\n", isize);
435 err = tcm825x_write_reg_mask(sensor->i2c_client,
436 tcm825x_siz_reg[isize]->reg, val);
440 /* configure pixel format */
441 switch (pix->pixelformat) {
443 case V4L2_PIX_FMT_RGB565:
446 case V4L2_PIX_FMT_UYVY:
451 dev_dbg(&sensor->i2c_client->dev,
452 "configuring pixel format %d\n", pfmt);
453 val = tcm825x_fmt_reg[pfmt]->val;
455 err = tcm825x_write_reg_mask(sensor->i2c_client,
456 tcm825x_fmt_reg[pfmt]->reg, val);
461 * For frame rate < 15, the FPS reg (addr 0x02, bit 7) must be
462 * set. Frame rate will be halved from the normal.
464 tgt_fps = fper->denominator / fper->numerator;
465 if (tgt_fps <= HIGH_FPS_MODE_LOWER_LIMIT) {
466 val = tcm825x_read_reg(sensor->i2c_client, 0x02);
468 tcm825x_write_reg(sensor->i2c_client, 0x02, val);
474 static int ioctl_queryctrl(struct v4l2_int_device *s,
475 struct v4l2_queryctrl *qc)
477 struct vcontrol *control;
479 control = find_vctrl(qc->id);
489 static int ioctl_g_ctrl(struct v4l2_int_device *s,
490 struct v4l2_control *vc)
492 struct tcm825x_sensor *sensor = s->priv;
493 struct i2c_client *client = sensor->i2c_client;
495 struct vcontrol *lvc;
497 /* exposure time is special, spread across 2 registers */
498 if (vc->id == V4L2_CID_EXPOSURE) {
499 int val_lower, val_upper;
501 val_upper = tcm825x_read_reg(client,
502 TCM825X_ADDR(TCM825X_ESRSPD_U));
505 val_lower = tcm825x_read_reg(client,
506 TCM825X_ADDR(TCM825X_ESRSPD_L));
510 vc->value = ((val_upper & 0x1f) << 8) | (val_lower);
514 lvc = find_vctrl(vc->id);
518 r = tcm825x_read_reg(client, TCM825X_ADDR(lvc->reg));
521 val = r & TCM825X_MASK(lvc->reg);
522 val >>= lvc->start_bit;
527 if (vc->id == V4L2_CID_HFLIP || vc->id == V4L2_CID_VFLIP)
528 val ^= sensor->platform_data->is_upside_down();
534 static int ioctl_s_ctrl(struct v4l2_int_device *s,
535 struct v4l2_control *vc)
537 struct tcm825x_sensor *sensor = s->priv;
538 struct i2c_client *client = sensor->i2c_client;
539 struct vcontrol *lvc;
542 /* exposure time is special, spread across 2 registers */
543 if (vc->id == V4L2_CID_EXPOSURE) {
544 int val_lower, val_upper;
546 val_lower = val & TCM825X_MASK(TCM825X_ESRSPD_L);
547 val_upper = (val >> 8) & TCM825X_MASK(TCM825X_ESRSPD_U);
549 if (tcm825x_write_reg_mask(client,
550 TCM825X_ESRSPD_U, val_upper))
553 if (tcm825x_write_reg_mask(client,
554 TCM825X_ESRSPD_L, val_lower))
560 lvc = find_vctrl(vc->id);
564 if (vc->id == V4L2_CID_HFLIP || vc->id == V4L2_CID_VFLIP)
565 val ^= sensor->platform_data->is_upside_down();
567 val = val << lvc->start_bit;
568 if (tcm825x_write_reg_mask(client, lvc->reg, val))
574 static int ioctl_enum_fmt_cap(struct v4l2_int_device *s,
575 struct v4l2_fmtdesc *fmt)
577 int index = fmt->index;
580 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
581 if (index >= TCM825X_NUM_CAPTURE_FORMATS)
589 fmt->flags = tcm825x_formats[index].flags;
590 strlcpy(fmt->description, tcm825x_formats[index].description,
591 sizeof(fmt->description));
592 fmt->pixelformat = tcm825x_formats[index].pixelformat;
597 static int ioctl_try_fmt_cap(struct v4l2_int_device *s,
598 struct v4l2_format *f)
600 struct tcm825x_sensor *sensor = s->priv;
601 enum image_size isize;
603 struct v4l2_pix_format *pix = &f->fmt.pix;
605 isize = tcm825x_find_size(s, pix->width, pix->height);
606 dev_dbg(&sensor->i2c_client->dev, "isize = %d num_capture = %lu\n",
607 isize, (unsigned long)TCM825X_NUM_CAPTURE_FORMATS);
609 pix->width = tcm825x_sizes[isize].width;
610 pix->height = tcm825x_sizes[isize].height;
612 for (ifmt = 0; ifmt < TCM825X_NUM_CAPTURE_FORMATS; ifmt++)
613 if (pix->pixelformat == tcm825x_formats[ifmt].pixelformat)
616 if (ifmt == TCM825X_NUM_CAPTURE_FORMATS)
617 ifmt = 0; /* Default = YUV 4:2:2 */
619 pix->pixelformat = tcm825x_formats[ifmt].pixelformat;
620 pix->field = V4L2_FIELD_NONE;
621 pix->bytesperline = pix->width * TCM825X_BYTES_PER_PIXEL;
622 pix->sizeimage = pix->bytesperline * pix->height;
624 dev_dbg(&sensor->i2c_client->dev, "format = 0x%08x\n",
627 switch (pix->pixelformat) {
628 case V4L2_PIX_FMT_UYVY:
630 pix->colorspace = V4L2_COLORSPACE_JPEG;
632 case V4L2_PIX_FMT_RGB565:
633 pix->colorspace = V4L2_COLORSPACE_SRGB;
640 static int ioctl_s_fmt_cap(struct v4l2_int_device *s,
641 struct v4l2_format *f)
643 struct tcm825x_sensor *sensor = s->priv;
644 struct v4l2_pix_format *pix = &f->fmt.pix;
647 rval = ioctl_try_fmt_cap(s, f);
651 rval = tcm825x_configure(s);
658 static int ioctl_g_fmt_cap(struct v4l2_int_device *s,
659 struct v4l2_format *f)
661 struct tcm825x_sensor *sensor = s->priv;
663 f->fmt.pix = sensor->pix;
668 static int ioctl_g_parm(struct v4l2_int_device *s,
669 struct v4l2_streamparm *a)
671 struct tcm825x_sensor *sensor = s->priv;
672 struct v4l2_captureparm *cparm = &a->parm.capture;
674 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
677 memset(a, 0, sizeof(*a));
678 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
680 cparm->capability = V4L2_CAP_TIMEPERFRAME;
681 cparm->timeperframe = sensor->timeperframe;
686 static int ioctl_s_parm(struct v4l2_int_device *s,
687 struct v4l2_streamparm *a)
689 struct tcm825x_sensor *sensor = s->priv;
690 struct v4l2_fract *timeperframe = &a->parm.capture.timeperframe;
691 u32 tgt_fps; /* target frames per secound */
694 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
697 if ((timeperframe->numerator == 0)
698 || (timeperframe->denominator == 0)) {
699 timeperframe->denominator = DEFAULT_FPS;
700 timeperframe->numerator = 1;
703 tgt_fps = timeperframe->denominator / timeperframe->numerator;
705 if (tgt_fps > MAX_FPS) {
706 timeperframe->denominator = MAX_FPS;
707 timeperframe->numerator = 1;
708 } else if (tgt_fps < MIN_FPS) {
709 timeperframe->denominator = MIN_FPS;
710 timeperframe->numerator = 1;
713 sensor->timeperframe = *timeperframe;
715 rval = tcm825x_configure(s);
720 static int ioctl_s_power(struct v4l2_int_device *s, int on)
722 struct tcm825x_sensor *sensor = s->priv;
724 return sensor->platform_data->power_set(on);
728 * Given the image capture format in pix, the nominal frame period in
729 * timeperframe, calculate the required xclk frequency.
731 * TCM825X input frequency characteristics are:
732 * Minimum 11.9 MHz, Typical 24.57 MHz and maximum 25/27 MHz
735 static int ioctl_g_ifparm(struct v4l2_int_device *s, struct v4l2_ifparm *p)
737 struct tcm825x_sensor *sensor = s->priv;
738 struct v4l2_fract *timeperframe = &sensor->timeperframe;
739 u32 tgt_xclk; /* target xclk */
740 u32 tgt_fps; /* target frames per secound */
743 rval = sensor->platform_data->ifparm(p);
747 tgt_fps = timeperframe->denominator / timeperframe->numerator;
749 tgt_xclk = (tgt_fps <= HIGH_FPS_MODE_LOWER_LIMIT) ?
750 (2457 * tgt_fps) / MAX_HALF_FPS :
751 (2457 * tgt_fps) / MAX_FPS;
754 tgt_xclk = min(tgt_xclk, (u32)TCM825X_XCLK_MAX);
755 tgt_xclk = max(tgt_xclk, (u32)TCM825X_XCLK_MIN);
757 p->u.bt656.clock_curr = tgt_xclk;
762 static int ioctl_g_needs_reset(struct v4l2_int_device *s, void *buf)
764 struct tcm825x_sensor *sensor = s->priv;
766 return sensor->platform_data->needs_reset(s, buf, &sensor->pix);
769 static int ioctl_reset(struct v4l2_int_device *s)
774 static int ioctl_init(struct v4l2_int_device *s)
776 return tcm825x_configure(s);
779 static int ioctl_dev_exit(struct v4l2_int_device *s)
784 static int ioctl_dev_init(struct v4l2_int_device *s)
786 struct tcm825x_sensor *sensor = s->priv;
789 r = tcm825x_read_reg(sensor->i2c_client, 0x01);
793 dev_err(&sensor->i2c_client->dev, "device not detected\n");
799 static struct v4l2_int_ioctl_desc tcm825x_ioctl_desc[] = {
800 { vidioc_int_dev_init_num,
801 (v4l2_int_ioctl_func *)ioctl_dev_init },
802 { vidioc_int_dev_exit_num,
803 (v4l2_int_ioctl_func *)ioctl_dev_exit },
804 { vidioc_int_s_power_num,
805 (v4l2_int_ioctl_func *)ioctl_s_power },
806 { vidioc_int_g_ifparm_num,
807 (v4l2_int_ioctl_func *)ioctl_g_ifparm },
808 { vidioc_int_g_needs_reset_num,
809 (v4l2_int_ioctl_func *)ioctl_g_needs_reset },
810 { vidioc_int_reset_num,
811 (v4l2_int_ioctl_func *)ioctl_reset },
812 { vidioc_int_init_num,
813 (v4l2_int_ioctl_func *)ioctl_init },
814 { vidioc_int_enum_fmt_cap_num,
815 (v4l2_int_ioctl_func *)ioctl_enum_fmt_cap },
816 { vidioc_int_try_fmt_cap_num,
817 (v4l2_int_ioctl_func *)ioctl_try_fmt_cap },
818 { vidioc_int_g_fmt_cap_num,
819 (v4l2_int_ioctl_func *)ioctl_g_fmt_cap },
820 { vidioc_int_s_fmt_cap_num,
821 (v4l2_int_ioctl_func *)ioctl_s_fmt_cap },
822 { vidioc_int_g_parm_num,
823 (v4l2_int_ioctl_func *)ioctl_g_parm },
824 { vidioc_int_s_parm_num,
825 (v4l2_int_ioctl_func *)ioctl_s_parm },
826 { vidioc_int_queryctrl_num,
827 (v4l2_int_ioctl_func *)ioctl_queryctrl },
828 { vidioc_int_g_ctrl_num,
829 (v4l2_int_ioctl_func *)ioctl_g_ctrl },
830 { vidioc_int_s_ctrl_num,
831 (v4l2_int_ioctl_func *)ioctl_s_ctrl },
834 static struct v4l2_int_slave tcm825x_slave = {
835 .ioctls = tcm825x_ioctl_desc,
836 .num_ioctls = ARRAY_SIZE(tcm825x_ioctl_desc),
839 static struct tcm825x_sensor tcm825x;
841 static struct v4l2_int_device tcm825x_int_device = {
842 .module = THIS_MODULE,
843 .name = TCM825X_NAME,
845 .type = v4l2_int_type_slave,
847 .slave = &tcm825x_slave,
851 static int tcm825x_probe(struct i2c_client *client,
852 const struct i2c_device_id *did)
854 struct tcm825x_sensor *sensor = &tcm825x;
856 if (i2c_get_clientdata(client))
859 sensor->platform_data = client->dev.platform_data;
861 if (sensor->platform_data == NULL
862 || !sensor->platform_data->is_okay())
865 sensor->v4l2_int_device = &tcm825x_int_device;
867 sensor->i2c_client = client;
868 i2c_set_clientdata(client, sensor);
870 /* Make the default capture format QVGA RGB565 */
871 sensor->pix.width = tcm825x_sizes[QVGA].width;
872 sensor->pix.height = tcm825x_sizes[QVGA].height;
873 sensor->pix.pixelformat = V4L2_PIX_FMT_RGB565;
875 return v4l2_int_device_register(sensor->v4l2_int_device);
878 static int tcm825x_remove(struct i2c_client *client)
880 struct tcm825x_sensor *sensor = i2c_get_clientdata(client);
882 if (!client->adapter)
883 return -ENODEV; /* our client isn't attached */
885 v4l2_int_device_unregister(sensor->v4l2_int_device);
890 static const struct i2c_device_id tcm825x_id[] = {
894 MODULE_DEVICE_TABLE(i2c, tcm825x_id);
896 static struct i2c_driver tcm825x_i2c_driver = {
898 .name = TCM825X_NAME,
900 .probe = tcm825x_probe,
901 .remove = tcm825x_remove,
902 .id_table = tcm825x_id,
905 static struct tcm825x_sensor tcm825x = {
908 .denominator = DEFAULT_FPS,
912 static int __init tcm825x_init(void)
916 rval = i2c_add_driver(&tcm825x_i2c_driver);
918 pr_info("%s: failed registering " TCM825X_NAME "\n",
924 static void __exit tcm825x_exit(void)
926 i2c_del_driver(&tcm825x_i2c_driver);
930 * FIXME: Menelaus isn't ready (?) at module_init stage, so use
931 * late_initcall for now.
933 late_initcall(tcm825x_init);
934 module_exit(tcm825x_exit);
936 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>");
937 MODULE_DESCRIPTION("TCM825x camera sensor driver");
938 MODULE_LICENSE("GPL");