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0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * Driver for MT9M001 CMOS Image Sensor from Micron
0004  *
0005  * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
0006  */
0007 
0008 #include <linux/clk.h>
0009 #include <linux/delay.h>
0010 #include <linux/gpio/consumer.h>
0011 #include <linux/i2c.h>
0012 #include <linux/log2.h>
0013 #include <linux/module.h>
0014 #include <linux/pm_runtime.h>
0015 #include <linux/slab.h>
0016 #include <linux/videodev2.h>
0017 
0018 #include <media/v4l2-ctrls.h>
0019 #include <media/v4l2-device.h>
0020 #include <media/v4l2-event.h>
0021 #include <media/v4l2-subdev.h>
0022 
0023 /*
0024  * mt9m001 i2c address 0x5d
0025  */
0026 
0027 /* mt9m001 selected register addresses */
0028 #define MT9M001_CHIP_VERSION        0x00
0029 #define MT9M001_ROW_START       0x01
0030 #define MT9M001_COLUMN_START        0x02
0031 #define MT9M001_WINDOW_HEIGHT       0x03
0032 #define MT9M001_WINDOW_WIDTH        0x04
0033 #define MT9M001_HORIZONTAL_BLANKING 0x05
0034 #define MT9M001_VERTICAL_BLANKING   0x06
0035 #define MT9M001_OUTPUT_CONTROL      0x07
0036 #define MT9M001_SHUTTER_WIDTH       0x09
0037 #define MT9M001_FRAME_RESTART       0x0b
0038 #define MT9M001_SHUTTER_DELAY       0x0c
0039 #define MT9M001_RESET           0x0d
0040 #define MT9M001_READ_OPTIONS1       0x1e
0041 #define MT9M001_READ_OPTIONS2       0x20
0042 #define MT9M001_GLOBAL_GAIN     0x35
0043 #define MT9M001_CHIP_ENABLE     0xF1
0044 
0045 #define MT9M001_MAX_WIDTH       1280
0046 #define MT9M001_MAX_HEIGHT      1024
0047 #define MT9M001_MIN_WIDTH       48
0048 #define MT9M001_MIN_HEIGHT      32
0049 #define MT9M001_COLUMN_SKIP     20
0050 #define MT9M001_ROW_SKIP        12
0051 #define MT9M001_DEFAULT_HBLANK      9
0052 #define MT9M001_DEFAULT_VBLANK      25
0053 
0054 /* MT9M001 has only one fixed colorspace per pixelcode */
0055 struct mt9m001_datafmt {
0056     u32 code;
0057     enum v4l2_colorspace        colorspace;
0058 };
0059 
0060 /* Find a data format by a pixel code in an array */
0061 static const struct mt9m001_datafmt *mt9m001_find_datafmt(
0062     u32 code, const struct mt9m001_datafmt *fmt,
0063     int n)
0064 {
0065     int i;
0066     for (i = 0; i < n; i++)
0067         if (fmt[i].code == code)
0068             return fmt + i;
0069 
0070     return NULL;
0071 }
0072 
0073 static const struct mt9m001_datafmt mt9m001_colour_fmts[] = {
0074     /*
0075      * Order important: first natively supported,
0076      * second supported with a GPIO extender
0077      */
0078     {MEDIA_BUS_FMT_SBGGR10_1X10, V4L2_COLORSPACE_SRGB},
0079     {MEDIA_BUS_FMT_SBGGR8_1X8, V4L2_COLORSPACE_SRGB},
0080 };
0081 
0082 static const struct mt9m001_datafmt mt9m001_monochrome_fmts[] = {
0083     /* Order important - see above */
0084     {MEDIA_BUS_FMT_Y10_1X10, V4L2_COLORSPACE_JPEG},
0085     {MEDIA_BUS_FMT_Y8_1X8, V4L2_COLORSPACE_JPEG},
0086 };
0087 
0088 struct mt9m001 {
0089     struct v4l2_subdev subdev;
0090     struct v4l2_ctrl_handler hdl;
0091     struct {
0092         /* exposure/auto-exposure cluster */
0093         struct v4l2_ctrl *autoexposure;
0094         struct v4l2_ctrl *exposure;
0095     };
0096     bool streaming;
0097     struct mutex mutex;
0098     struct v4l2_rect rect;  /* Sensor window */
0099     struct clk *clk;
0100     struct gpio_desc *standby_gpio;
0101     struct gpio_desc *reset_gpio;
0102     const struct mt9m001_datafmt *fmt;
0103     const struct mt9m001_datafmt *fmts;
0104     int num_fmts;
0105     unsigned int total_h;
0106     unsigned short y_skip_top;  /* Lines to skip at the top */
0107     struct media_pad pad;
0108 };
0109 
0110 static struct mt9m001 *to_mt9m001(const struct i2c_client *client)
0111 {
0112     return container_of(i2c_get_clientdata(client), struct mt9m001, subdev);
0113 }
0114 
0115 static int reg_read(struct i2c_client *client, const u8 reg)
0116 {
0117     return i2c_smbus_read_word_swapped(client, reg);
0118 }
0119 
0120 static int reg_write(struct i2c_client *client, const u8 reg,
0121              const u16 data)
0122 {
0123     return i2c_smbus_write_word_swapped(client, reg, data);
0124 }
0125 
0126 static int reg_set(struct i2c_client *client, const u8 reg,
0127            const u16 data)
0128 {
0129     int ret;
0130 
0131     ret = reg_read(client, reg);
0132     if (ret < 0)
0133         return ret;
0134     return reg_write(client, reg, ret | data);
0135 }
0136 
0137 static int reg_clear(struct i2c_client *client, const u8 reg,
0138              const u16 data)
0139 {
0140     int ret;
0141 
0142     ret = reg_read(client, reg);
0143     if (ret < 0)
0144         return ret;
0145     return reg_write(client, reg, ret & ~data);
0146 }
0147 
0148 struct mt9m001_reg {
0149     u8 reg;
0150     u16 data;
0151 };
0152 
0153 static int multi_reg_write(struct i2c_client *client,
0154                const struct mt9m001_reg *regs, int num)
0155 {
0156     int i;
0157 
0158     for (i = 0; i < num; i++) {
0159         int ret = reg_write(client, regs[i].reg, regs[i].data);
0160 
0161         if (ret)
0162             return ret;
0163     }
0164 
0165     return 0;
0166 }
0167 
0168 static int mt9m001_init(struct i2c_client *client)
0169 {
0170     static const struct mt9m001_reg init_regs[] = {
0171         /*
0172          * Issue a soft reset. This returns all registers to their
0173          * default values.
0174          */
0175         { MT9M001_RESET, 1 },
0176         { MT9M001_RESET, 0 },
0177         /* Disable chip, synchronous option update */
0178         { MT9M001_OUTPUT_CONTROL, 0 }
0179     };
0180 
0181     dev_dbg(&client->dev, "%s\n", __func__);
0182 
0183     return multi_reg_write(client, init_regs, ARRAY_SIZE(init_regs));
0184 }
0185 
0186 static int mt9m001_apply_selection(struct v4l2_subdev *sd)
0187 {
0188     struct i2c_client *client = v4l2_get_subdevdata(sd);
0189     struct mt9m001 *mt9m001 = to_mt9m001(client);
0190     const struct mt9m001_reg regs[] = {
0191         /* Blanking and start values - default... */
0192         { MT9M001_HORIZONTAL_BLANKING, MT9M001_DEFAULT_HBLANK },
0193         { MT9M001_VERTICAL_BLANKING, MT9M001_DEFAULT_VBLANK },
0194         /*
0195          * The caller provides a supported format, as verified per
0196          * call to .set_fmt(FORMAT_TRY).
0197          */
0198         { MT9M001_COLUMN_START, mt9m001->rect.left },
0199         { MT9M001_ROW_START, mt9m001->rect.top },
0200         { MT9M001_WINDOW_WIDTH, mt9m001->rect.width - 1 },
0201         { MT9M001_WINDOW_HEIGHT,
0202             mt9m001->rect.height + mt9m001->y_skip_top - 1 },
0203     };
0204 
0205     return multi_reg_write(client, regs, ARRAY_SIZE(regs));
0206 }
0207 
0208 static int mt9m001_s_stream(struct v4l2_subdev *sd, int enable)
0209 {
0210     struct i2c_client *client = v4l2_get_subdevdata(sd);
0211     struct mt9m001 *mt9m001 = to_mt9m001(client);
0212     int ret = 0;
0213 
0214     mutex_lock(&mt9m001->mutex);
0215 
0216     if (mt9m001->streaming == enable)
0217         goto done;
0218 
0219     if (enable) {
0220         ret = pm_runtime_resume_and_get(&client->dev);
0221         if (ret < 0)
0222             goto unlock;
0223 
0224         ret = mt9m001_apply_selection(sd);
0225         if (ret)
0226             goto put_unlock;
0227 
0228         ret = __v4l2_ctrl_handler_setup(&mt9m001->hdl);
0229         if (ret)
0230             goto put_unlock;
0231 
0232         /* Switch to master "normal" mode */
0233         ret = reg_write(client, MT9M001_OUTPUT_CONTROL, 2);
0234         if (ret < 0)
0235             goto put_unlock;
0236     } else {
0237         /* Switch to master stop sensor readout */
0238         reg_write(client, MT9M001_OUTPUT_CONTROL, 0);
0239         pm_runtime_put(&client->dev);
0240     }
0241 
0242     mt9m001->streaming = enable;
0243 done:
0244     mutex_unlock(&mt9m001->mutex);
0245 
0246     return 0;
0247 
0248 put_unlock:
0249     pm_runtime_put(&client->dev);
0250 unlock:
0251     mutex_unlock(&mt9m001->mutex);
0252 
0253     return ret;
0254 }
0255 
0256 static int mt9m001_set_selection(struct v4l2_subdev *sd,
0257         struct v4l2_subdev_state *sd_state,
0258         struct v4l2_subdev_selection *sel)
0259 {
0260     struct i2c_client *client = v4l2_get_subdevdata(sd);
0261     struct mt9m001 *mt9m001 = to_mt9m001(client);
0262     struct v4l2_rect rect = sel->r;
0263 
0264     if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE ||
0265         sel->target != V4L2_SEL_TGT_CROP)
0266         return -EINVAL;
0267 
0268     if (mt9m001->fmts == mt9m001_colour_fmts)
0269         /*
0270          * Bayer format - even number of rows for simplicity,
0271          * but let the user play with the top row.
0272          */
0273         rect.height = ALIGN(rect.height, 2);
0274 
0275     /* Datasheet requirement: see register description */
0276     rect.width = ALIGN(rect.width, 2);
0277     rect.left = ALIGN(rect.left, 2);
0278 
0279     rect.width = clamp_t(u32, rect.width, MT9M001_MIN_WIDTH,
0280             MT9M001_MAX_WIDTH);
0281     rect.left = clamp_t(u32, rect.left, MT9M001_COLUMN_SKIP,
0282             MT9M001_COLUMN_SKIP + MT9M001_MAX_WIDTH - rect.width);
0283 
0284     rect.height = clamp_t(u32, rect.height, MT9M001_MIN_HEIGHT,
0285             MT9M001_MAX_HEIGHT);
0286     rect.top = clamp_t(u32, rect.top, MT9M001_ROW_SKIP,
0287             MT9M001_ROW_SKIP + MT9M001_MAX_HEIGHT - rect.height);
0288 
0289     mt9m001->total_h = rect.height + mt9m001->y_skip_top +
0290                MT9M001_DEFAULT_VBLANK;
0291 
0292     mt9m001->rect = rect;
0293 
0294     return 0;
0295 }
0296 
0297 static int mt9m001_get_selection(struct v4l2_subdev *sd,
0298         struct v4l2_subdev_state *sd_state,
0299         struct v4l2_subdev_selection *sel)
0300 {
0301     struct i2c_client *client = v4l2_get_subdevdata(sd);
0302     struct mt9m001 *mt9m001 = to_mt9m001(client);
0303 
0304     if (sel->which != V4L2_SUBDEV_FORMAT_ACTIVE)
0305         return -EINVAL;
0306 
0307     switch (sel->target) {
0308     case V4L2_SEL_TGT_CROP_BOUNDS:
0309         sel->r.left = MT9M001_COLUMN_SKIP;
0310         sel->r.top = MT9M001_ROW_SKIP;
0311         sel->r.width = MT9M001_MAX_WIDTH;
0312         sel->r.height = MT9M001_MAX_HEIGHT;
0313         return 0;
0314     case V4L2_SEL_TGT_CROP:
0315         sel->r = mt9m001->rect;
0316         return 0;
0317     default:
0318         return -EINVAL;
0319     }
0320 }
0321 
0322 static int mt9m001_get_fmt(struct v4l2_subdev *sd,
0323         struct v4l2_subdev_state *sd_state,
0324         struct v4l2_subdev_format *format)
0325 {
0326     struct i2c_client *client = v4l2_get_subdevdata(sd);
0327     struct mt9m001 *mt9m001 = to_mt9m001(client);
0328     struct v4l2_mbus_framefmt *mf = &format->format;
0329 
0330     if (format->pad)
0331         return -EINVAL;
0332 
0333     if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
0334         mf = v4l2_subdev_get_try_format(sd, sd_state, 0);
0335         format->format = *mf;
0336         return 0;
0337     }
0338 
0339     mf->width   = mt9m001->rect.width;
0340     mf->height  = mt9m001->rect.height;
0341     mf->code    = mt9m001->fmt->code;
0342     mf->colorspace  = mt9m001->fmt->colorspace;
0343     mf->field   = V4L2_FIELD_NONE;
0344     mf->ycbcr_enc   = V4L2_YCBCR_ENC_DEFAULT;
0345     mf->quantization = V4L2_QUANTIZATION_DEFAULT;
0346     mf->xfer_func   = V4L2_XFER_FUNC_DEFAULT;
0347 
0348     return 0;
0349 }
0350 
0351 static int mt9m001_s_fmt(struct v4l2_subdev *sd,
0352              const struct mt9m001_datafmt *fmt,
0353              struct v4l2_mbus_framefmt *mf)
0354 {
0355     struct i2c_client *client = v4l2_get_subdevdata(sd);
0356     struct mt9m001 *mt9m001 = to_mt9m001(client);
0357     struct v4l2_subdev_selection sel = {
0358         .which = V4L2_SUBDEV_FORMAT_ACTIVE,
0359         .target = V4L2_SEL_TGT_CROP,
0360         .r.left = mt9m001->rect.left,
0361         .r.top = mt9m001->rect.top,
0362         .r.width = mf->width,
0363         .r.height = mf->height,
0364     };
0365     int ret;
0366 
0367     /* No support for scaling so far, just crop. TODO: use skipping */
0368     ret = mt9m001_set_selection(sd, NULL, &sel);
0369     if (!ret) {
0370         mf->width   = mt9m001->rect.width;
0371         mf->height  = mt9m001->rect.height;
0372         mt9m001->fmt    = fmt;
0373         mf->colorspace  = fmt->colorspace;
0374     }
0375 
0376     return ret;
0377 }
0378 
0379 static int mt9m001_set_fmt(struct v4l2_subdev *sd,
0380         struct v4l2_subdev_state *sd_state,
0381         struct v4l2_subdev_format *format)
0382 {
0383     struct v4l2_mbus_framefmt *mf = &format->format;
0384     struct i2c_client *client = v4l2_get_subdevdata(sd);
0385     struct mt9m001 *mt9m001 = to_mt9m001(client);
0386     const struct mt9m001_datafmt *fmt;
0387 
0388     if (format->pad)
0389         return -EINVAL;
0390 
0391     v4l_bound_align_image(&mf->width, MT9M001_MIN_WIDTH,
0392         MT9M001_MAX_WIDTH, 1,
0393         &mf->height, MT9M001_MIN_HEIGHT + mt9m001->y_skip_top,
0394         MT9M001_MAX_HEIGHT + mt9m001->y_skip_top, 0, 0);
0395 
0396     if (mt9m001->fmts == mt9m001_colour_fmts)
0397         mf->height = ALIGN(mf->height - 1, 2);
0398 
0399     fmt = mt9m001_find_datafmt(mf->code, mt9m001->fmts,
0400                    mt9m001->num_fmts);
0401     if (!fmt) {
0402         fmt = mt9m001->fmt;
0403         mf->code = fmt->code;
0404     }
0405 
0406     mf->colorspace  = fmt->colorspace;
0407     mf->field   = V4L2_FIELD_NONE;
0408     mf->ycbcr_enc   = V4L2_YCBCR_ENC_DEFAULT;
0409     mf->quantization = V4L2_QUANTIZATION_DEFAULT;
0410     mf->xfer_func   = V4L2_XFER_FUNC_DEFAULT;
0411 
0412     if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE)
0413         return mt9m001_s_fmt(sd, fmt, mf);
0414     sd_state->pads->try_fmt = *mf;
0415     return 0;
0416 }
0417 
0418 #ifdef CONFIG_VIDEO_ADV_DEBUG
0419 static int mt9m001_g_register(struct v4l2_subdev *sd,
0420                   struct v4l2_dbg_register *reg)
0421 {
0422     struct i2c_client *client = v4l2_get_subdevdata(sd);
0423 
0424     if (reg->reg > 0xff)
0425         return -EINVAL;
0426 
0427     reg->size = 2;
0428     reg->val = reg_read(client, reg->reg);
0429 
0430     if (reg->val > 0xffff)
0431         return -EIO;
0432 
0433     return 0;
0434 }
0435 
0436 static int mt9m001_s_register(struct v4l2_subdev *sd,
0437                   const struct v4l2_dbg_register *reg)
0438 {
0439     struct i2c_client *client = v4l2_get_subdevdata(sd);
0440 
0441     if (reg->reg > 0xff)
0442         return -EINVAL;
0443 
0444     if (reg_write(client, reg->reg, reg->val) < 0)
0445         return -EIO;
0446 
0447     return 0;
0448 }
0449 #endif
0450 
0451 static int mt9m001_power_on(struct device *dev)
0452 {
0453     struct i2c_client *client = to_i2c_client(dev);
0454     struct mt9m001 *mt9m001 = to_mt9m001(client);
0455     int ret;
0456 
0457     ret = clk_prepare_enable(mt9m001->clk);
0458     if (ret)
0459         return ret;
0460 
0461     if (mt9m001->standby_gpio) {
0462         gpiod_set_value_cansleep(mt9m001->standby_gpio, 0);
0463         usleep_range(1000, 2000);
0464     }
0465 
0466     if (mt9m001->reset_gpio) {
0467         gpiod_set_value_cansleep(mt9m001->reset_gpio, 1);
0468         usleep_range(1000, 2000);
0469         gpiod_set_value_cansleep(mt9m001->reset_gpio, 0);
0470         usleep_range(1000, 2000);
0471     }
0472 
0473     return 0;
0474 }
0475 
0476 static int mt9m001_power_off(struct device *dev)
0477 {
0478     struct i2c_client *client = to_i2c_client(dev);
0479     struct mt9m001 *mt9m001 = to_mt9m001(client);
0480 
0481     gpiod_set_value_cansleep(mt9m001->standby_gpio, 1);
0482     clk_disable_unprepare(mt9m001->clk);
0483 
0484     return 0;
0485 }
0486 
0487 static int mt9m001_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
0488 {
0489     struct mt9m001 *mt9m001 = container_of(ctrl->handler,
0490                            struct mt9m001, hdl);
0491     s32 min, max;
0492 
0493     switch (ctrl->id) {
0494     case V4L2_CID_EXPOSURE_AUTO:
0495         min = mt9m001->exposure->minimum;
0496         max = mt9m001->exposure->maximum;
0497         mt9m001->exposure->val =
0498             (524 + (mt9m001->total_h - 1) * (max - min)) / 1048 + min;
0499         break;
0500     }
0501     return 0;
0502 }
0503 
0504 static int mt9m001_s_ctrl(struct v4l2_ctrl *ctrl)
0505 {
0506     struct mt9m001 *mt9m001 = container_of(ctrl->handler,
0507                            struct mt9m001, hdl);
0508     struct v4l2_subdev *sd = &mt9m001->subdev;
0509     struct i2c_client *client = v4l2_get_subdevdata(sd);
0510     struct v4l2_ctrl *exp = mt9m001->exposure;
0511     int data;
0512     int ret;
0513 
0514     if (!pm_runtime_get_if_in_use(&client->dev))
0515         return 0;
0516 
0517     switch (ctrl->id) {
0518     case V4L2_CID_VFLIP:
0519         if (ctrl->val)
0520             ret = reg_set(client, MT9M001_READ_OPTIONS2, 0x8000);
0521         else
0522             ret = reg_clear(client, MT9M001_READ_OPTIONS2, 0x8000);
0523         break;
0524 
0525     case V4L2_CID_GAIN:
0526         /* See Datasheet Table 7, Gain settings. */
0527         if (ctrl->val <= ctrl->default_value) {
0528             /* Pack it into 0..1 step 0.125, register values 0..8 */
0529             unsigned long range = ctrl->default_value - ctrl->minimum;
0530             data = ((ctrl->val - (s32)ctrl->minimum) * 8 + range / 2) / range;
0531 
0532             dev_dbg(&client->dev, "Setting gain %d\n", data);
0533             ret = reg_write(client, MT9M001_GLOBAL_GAIN, data);
0534         } else {
0535             /* Pack it into 1.125..15 variable step, register values 9..67 */
0536             /* We assume qctrl->maximum - qctrl->default_value - 1 > 0 */
0537             unsigned long range = ctrl->maximum - ctrl->default_value - 1;
0538             unsigned long gain = ((ctrl->val - (s32)ctrl->default_value - 1) *
0539                            111 + range / 2) / range + 9;
0540 
0541             if (gain <= 32)
0542                 data = gain;
0543             else if (gain <= 64)
0544                 data = ((gain - 32) * 16 + 16) / 32 + 80;
0545             else
0546                 data = ((gain - 64) * 7 + 28) / 56 + 96;
0547 
0548             dev_dbg(&client->dev, "Setting gain from %d to %d\n",
0549                  reg_read(client, MT9M001_GLOBAL_GAIN), data);
0550             ret = reg_write(client, MT9M001_GLOBAL_GAIN, data);
0551         }
0552         break;
0553 
0554     case V4L2_CID_EXPOSURE_AUTO:
0555         if (ctrl->val == V4L2_EXPOSURE_MANUAL) {
0556             unsigned long range = exp->maximum - exp->minimum;
0557             unsigned long shutter = ((exp->val - (s32)exp->minimum) * 1048 +
0558                          range / 2) / range + 1;
0559 
0560             dev_dbg(&client->dev,
0561                 "Setting shutter width from %d to %lu\n",
0562                 reg_read(client, MT9M001_SHUTTER_WIDTH), shutter);
0563             ret = reg_write(client, MT9M001_SHUTTER_WIDTH, shutter);
0564         } else {
0565             mt9m001->total_h = mt9m001->rect.height +
0566                 mt9m001->y_skip_top + MT9M001_DEFAULT_VBLANK;
0567             ret = reg_write(client, MT9M001_SHUTTER_WIDTH,
0568                     mt9m001->total_h);
0569         }
0570         break;
0571     default:
0572         ret = -EINVAL;
0573         break;
0574     }
0575 
0576     pm_runtime_put(&client->dev);
0577 
0578     return ret;
0579 }
0580 
0581 /*
0582  * Interface active, can use i2c. If it fails, it can indeed mean, that
0583  * this wasn't our capture interface, so, we wait for the right one
0584  */
0585 static int mt9m001_video_probe(struct i2c_client *client)
0586 {
0587     struct mt9m001 *mt9m001 = to_mt9m001(client);
0588     s32 data;
0589     int ret;
0590 
0591     /* Enable the chip */
0592     data = reg_write(client, MT9M001_CHIP_ENABLE, 1);
0593     dev_dbg(&client->dev, "write: %d\n", data);
0594 
0595     /* Read out the chip version register */
0596     data = reg_read(client, MT9M001_CHIP_VERSION);
0597 
0598     /* must be 0x8411 or 0x8421 for colour sensor and 8431 for bw */
0599     switch (data) {
0600     case 0x8411:
0601     case 0x8421:
0602         mt9m001->fmts = mt9m001_colour_fmts;
0603         mt9m001->num_fmts = ARRAY_SIZE(mt9m001_colour_fmts);
0604         break;
0605     case 0x8431:
0606         mt9m001->fmts = mt9m001_monochrome_fmts;
0607         mt9m001->num_fmts = ARRAY_SIZE(mt9m001_monochrome_fmts);
0608         break;
0609     default:
0610         dev_err(&client->dev,
0611             "No MT9M001 chip detected, register read %x\n", data);
0612         ret = -ENODEV;
0613         goto done;
0614     }
0615 
0616     mt9m001->fmt = &mt9m001->fmts[0];
0617 
0618     dev_info(&client->dev, "Detected a MT9M001 chip ID %x (%s)\n", data,
0619          data == 0x8431 ? "C12STM" : "C12ST");
0620 
0621     ret = mt9m001_init(client);
0622     if (ret < 0) {
0623         dev_err(&client->dev, "Failed to initialise the camera\n");
0624         goto done;
0625     }
0626 
0627     /* mt9m001_init() has reset the chip, returning registers to defaults */
0628     ret = v4l2_ctrl_handler_setup(&mt9m001->hdl);
0629 
0630 done:
0631     return ret;
0632 }
0633 
0634 static int mt9m001_g_skip_top_lines(struct v4l2_subdev *sd, u32 *lines)
0635 {
0636     struct i2c_client *client = v4l2_get_subdevdata(sd);
0637     struct mt9m001 *mt9m001 = to_mt9m001(client);
0638 
0639     *lines = mt9m001->y_skip_top;
0640 
0641     return 0;
0642 }
0643 
0644 static const struct v4l2_ctrl_ops mt9m001_ctrl_ops = {
0645     .g_volatile_ctrl = mt9m001_g_volatile_ctrl,
0646     .s_ctrl = mt9m001_s_ctrl,
0647 };
0648 
0649 static const struct v4l2_subdev_core_ops mt9m001_subdev_core_ops = {
0650     .log_status = v4l2_ctrl_subdev_log_status,
0651     .subscribe_event = v4l2_ctrl_subdev_subscribe_event,
0652     .unsubscribe_event = v4l2_event_subdev_unsubscribe,
0653 #ifdef CONFIG_VIDEO_ADV_DEBUG
0654     .g_register = mt9m001_g_register,
0655     .s_register = mt9m001_s_register,
0656 #endif
0657 };
0658 
0659 static int mt9m001_init_cfg(struct v4l2_subdev *sd,
0660                 struct v4l2_subdev_state *sd_state)
0661 {
0662     struct i2c_client *client = v4l2_get_subdevdata(sd);
0663     struct mt9m001 *mt9m001 = to_mt9m001(client);
0664     struct v4l2_mbus_framefmt *try_fmt =
0665         v4l2_subdev_get_try_format(sd, sd_state, 0);
0666 
0667     try_fmt->width      = MT9M001_MAX_WIDTH;
0668     try_fmt->height     = MT9M001_MAX_HEIGHT;
0669     try_fmt->code       = mt9m001->fmts[0].code;
0670     try_fmt->colorspace = mt9m001->fmts[0].colorspace;
0671     try_fmt->field      = V4L2_FIELD_NONE;
0672     try_fmt->ycbcr_enc  = V4L2_YCBCR_ENC_DEFAULT;
0673     try_fmt->quantization   = V4L2_QUANTIZATION_DEFAULT;
0674     try_fmt->xfer_func  = V4L2_XFER_FUNC_DEFAULT;
0675 
0676     return 0;
0677 }
0678 
0679 static int mt9m001_enum_mbus_code(struct v4l2_subdev *sd,
0680         struct v4l2_subdev_state *sd_state,
0681         struct v4l2_subdev_mbus_code_enum *code)
0682 {
0683     struct i2c_client *client = v4l2_get_subdevdata(sd);
0684     struct mt9m001 *mt9m001 = to_mt9m001(client);
0685 
0686     if (code->pad || code->index >= mt9m001->num_fmts)
0687         return -EINVAL;
0688 
0689     code->code = mt9m001->fmts[code->index].code;
0690     return 0;
0691 }
0692 
0693 static int mt9m001_get_mbus_config(struct v4l2_subdev *sd,
0694                    unsigned int pad,
0695                    struct v4l2_mbus_config *cfg)
0696 {
0697     /* MT9M001 has all capture_format parameters fixed */
0698     cfg->type = V4L2_MBUS_PARALLEL;
0699     cfg->bus.parallel.flags = V4L2_MBUS_PCLK_SAMPLE_FALLING |
0700                   V4L2_MBUS_HSYNC_ACTIVE_HIGH |
0701                   V4L2_MBUS_VSYNC_ACTIVE_HIGH |
0702                   V4L2_MBUS_DATA_ACTIVE_HIGH |
0703                   V4L2_MBUS_MASTER;
0704 
0705     return 0;
0706 }
0707 
0708 static const struct v4l2_subdev_video_ops mt9m001_subdev_video_ops = {
0709     .s_stream   = mt9m001_s_stream,
0710 };
0711 
0712 static const struct v4l2_subdev_sensor_ops mt9m001_subdev_sensor_ops = {
0713     .g_skip_top_lines   = mt9m001_g_skip_top_lines,
0714 };
0715 
0716 static const struct v4l2_subdev_pad_ops mt9m001_subdev_pad_ops = {
0717     .init_cfg   = mt9m001_init_cfg,
0718     .enum_mbus_code = mt9m001_enum_mbus_code,
0719     .get_selection  = mt9m001_get_selection,
0720     .set_selection  = mt9m001_set_selection,
0721     .get_fmt    = mt9m001_get_fmt,
0722     .set_fmt    = mt9m001_set_fmt,
0723     .get_mbus_config = mt9m001_get_mbus_config,
0724 };
0725 
0726 static const struct v4l2_subdev_ops mt9m001_subdev_ops = {
0727     .core   = &mt9m001_subdev_core_ops,
0728     .video  = &mt9m001_subdev_video_ops,
0729     .sensor = &mt9m001_subdev_sensor_ops,
0730     .pad    = &mt9m001_subdev_pad_ops,
0731 };
0732 
0733 static int mt9m001_probe(struct i2c_client *client)
0734 {
0735     struct mt9m001 *mt9m001;
0736     struct i2c_adapter *adapter = client->adapter;
0737     int ret;
0738 
0739     if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
0740         dev_warn(&adapter->dev,
0741              "I2C-Adapter doesn't support I2C_FUNC_SMBUS_WORD\n");
0742         return -EIO;
0743     }
0744 
0745     mt9m001 = devm_kzalloc(&client->dev, sizeof(*mt9m001), GFP_KERNEL);
0746     if (!mt9m001)
0747         return -ENOMEM;
0748 
0749     mt9m001->clk = devm_clk_get(&client->dev, NULL);
0750     if (IS_ERR(mt9m001->clk))
0751         return PTR_ERR(mt9m001->clk);
0752 
0753     mt9m001->standby_gpio = devm_gpiod_get_optional(&client->dev, "standby",
0754                             GPIOD_OUT_LOW);
0755     if (IS_ERR(mt9m001->standby_gpio))
0756         return PTR_ERR(mt9m001->standby_gpio);
0757 
0758     mt9m001->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
0759                               GPIOD_OUT_LOW);
0760     if (IS_ERR(mt9m001->reset_gpio))
0761         return PTR_ERR(mt9m001->reset_gpio);
0762 
0763     v4l2_i2c_subdev_init(&mt9m001->subdev, client, &mt9m001_subdev_ops);
0764     mt9m001->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
0765                  V4L2_SUBDEV_FL_HAS_EVENTS;
0766     v4l2_ctrl_handler_init(&mt9m001->hdl, 4);
0767     v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
0768             V4L2_CID_VFLIP, 0, 1, 1, 0);
0769     v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
0770             V4L2_CID_GAIN, 0, 127, 1, 64);
0771     mt9m001->exposure = v4l2_ctrl_new_std(&mt9m001->hdl, &mt9m001_ctrl_ops,
0772             V4L2_CID_EXPOSURE, 1, 255, 1, 255);
0773     /*
0774      * Simulated autoexposure. If enabled, we calculate shutter width
0775      * ourselves in the driver based on vertical blanking and frame width
0776      */
0777     mt9m001->autoexposure = v4l2_ctrl_new_std_menu(&mt9m001->hdl,
0778             &mt9m001_ctrl_ops, V4L2_CID_EXPOSURE_AUTO, 1, 0,
0779             V4L2_EXPOSURE_AUTO);
0780     mt9m001->subdev.ctrl_handler = &mt9m001->hdl;
0781     if (mt9m001->hdl.error)
0782         return mt9m001->hdl.error;
0783 
0784     v4l2_ctrl_auto_cluster(2, &mt9m001->autoexposure,
0785                     V4L2_EXPOSURE_MANUAL, true);
0786 
0787     mutex_init(&mt9m001->mutex);
0788     mt9m001->hdl.lock = &mt9m001->mutex;
0789 
0790     /* Second stage probe - when a capture adapter is there */
0791     mt9m001->y_skip_top = 0;
0792     mt9m001->rect.left  = MT9M001_COLUMN_SKIP;
0793     mt9m001->rect.top   = MT9M001_ROW_SKIP;
0794     mt9m001->rect.width = MT9M001_MAX_WIDTH;
0795     mt9m001->rect.height    = MT9M001_MAX_HEIGHT;
0796 
0797     ret = mt9m001_power_on(&client->dev);
0798     if (ret)
0799         goto error_hdl_free;
0800 
0801     pm_runtime_set_active(&client->dev);
0802     pm_runtime_enable(&client->dev);
0803 
0804     ret = mt9m001_video_probe(client);
0805     if (ret)
0806         goto error_power_off;
0807 
0808     mt9m001->pad.flags = MEDIA_PAD_FL_SOURCE;
0809     mt9m001->subdev.entity.function = MEDIA_ENT_F_CAM_SENSOR;
0810     ret = media_entity_pads_init(&mt9m001->subdev.entity, 1, &mt9m001->pad);
0811     if (ret)
0812         goto error_power_off;
0813 
0814     ret = v4l2_async_register_subdev(&mt9m001->subdev);
0815     if (ret)
0816         goto error_entity_cleanup;
0817 
0818     pm_runtime_idle(&client->dev);
0819 
0820     return 0;
0821 
0822 error_entity_cleanup:
0823     media_entity_cleanup(&mt9m001->subdev.entity);
0824 error_power_off:
0825     pm_runtime_disable(&client->dev);
0826     pm_runtime_set_suspended(&client->dev);
0827     mt9m001_power_off(&client->dev);
0828 
0829 error_hdl_free:
0830     v4l2_ctrl_handler_free(&mt9m001->hdl);
0831     mutex_destroy(&mt9m001->mutex);
0832 
0833     return ret;
0834 }
0835 
0836 static int mt9m001_remove(struct i2c_client *client)
0837 {
0838     struct mt9m001 *mt9m001 = to_mt9m001(client);
0839 
0840     /*
0841      * As it increments RPM usage_count even on errors, we don't need to
0842      * check the returned code here.
0843      */
0844     pm_runtime_get_sync(&client->dev);
0845 
0846     v4l2_async_unregister_subdev(&mt9m001->subdev);
0847     media_entity_cleanup(&mt9m001->subdev.entity);
0848 
0849     pm_runtime_disable(&client->dev);
0850     pm_runtime_set_suspended(&client->dev);
0851     pm_runtime_put_noidle(&client->dev);
0852     mt9m001_power_off(&client->dev);
0853 
0854     v4l2_ctrl_handler_free(&mt9m001->hdl);
0855     mutex_destroy(&mt9m001->mutex);
0856 
0857     return 0;
0858 }
0859 
0860 static const struct i2c_device_id mt9m001_id[] = {
0861     { "mt9m001", 0 },
0862     { }
0863 };
0864 MODULE_DEVICE_TABLE(i2c, mt9m001_id);
0865 
0866 static const struct dev_pm_ops mt9m001_pm_ops = {
0867     SET_RUNTIME_PM_OPS(mt9m001_power_off, mt9m001_power_on, NULL)
0868 };
0869 
0870 static const struct of_device_id mt9m001_of_match[] = {
0871     { .compatible = "onnn,mt9m001", },
0872     { /* sentinel */ },
0873 };
0874 MODULE_DEVICE_TABLE(of, mt9m001_of_match);
0875 
0876 static struct i2c_driver mt9m001_i2c_driver = {
0877     .driver = {
0878         .name = "mt9m001",
0879         .pm = &mt9m001_pm_ops,
0880         .of_match_table = mt9m001_of_match,
0881     },
0882     .probe_new  = mt9m001_probe,
0883     .remove     = mt9m001_remove,
0884     .id_table   = mt9m001_id,
0885 };
0886 
0887 module_i2c_driver(mt9m001_i2c_driver);
0888 
0889 MODULE_DESCRIPTION("Micron MT9M001 Camera driver");
0890 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
0891 MODULE_LICENSE("GPL v2");
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