drivers/media/i2c/adv748x/adv748x-csi2.c

   1 /*
   2  * Driver for Analog Devices ADV748X CSI-2 Transmitter
   3  *
   4  * Copyright (C) 2017 Renesas Electronics Corp.
   5  *
   6  * This program is free software; you can redistribute  it and/or modify it
   7  * under  the terms of  the GNU General  Public License as published by the
   8  * Free Software Foundation;  either version 2 of the  License, or (at your
   9  * option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/mutex.h>
  14
  15 #include <media/v4l2-ctrls.h>
  16 #include <media/v4l2-device.h>
  17 #include <media/v4l2-ioctl.h>
  18
  19 #include "adv748x.h"
  20
  21 static bool is_txa(struct adv748x_csi2 *tx)
  22 {
  23         return tx == &tx->state->txa;
  24 }
  25
  26 static int adv748x_csi2_set_virtual_channel(struct adv748x_csi2 *tx,
  27                                             unsigned int vc)
  28 {
  29         return tx_write(tx, ADV748X_CSI_VC_REF, vc << ADV748X_CSI_VC_REF_SHIFT);
  30 }
  31
  32 /**
  33  * adv748x_csi2_register_link : Register and link internal entities
  34  *
  35  * @tx: CSI2 private entity
  36  * @v4l2_dev: Video registration device
  37  * @src: Source subdevice to establish link
  38  * @src_pad: Pad number of source to link to this @tx
  39  *
  40  * Ensure that the subdevice is registered against the v4l2_device, and link the
  41  * source pad to the sink pad of the CSI2 bus entity.
  42  */
  43 static int adv748x_csi2_register_link(struct adv748x_csi2 *tx,
  44                                       struct v4l2_device *v4l2_dev,
  45                                       struct v4l2_subdev *src,
  46                                       unsigned int src_pad)
  47 {
  48         int enabled = MEDIA_LNK_FL_ENABLED;
  49         int ret;
  50
  51         /*
  52          * Dynamic linking of the AFE is not supported.
  53          * Register the links as immutable.
  54          */
  55         enabled |= MEDIA_LNK_FL_IMMUTABLE;
  56
  57         if (!src->v4l2_dev) {
  58                 ret = v4l2_device_register_subdev(v4l2_dev, src);
  59                 if (ret)
  60                         return ret;
  61         }
  62
  63         return media_create_pad_link(&src->entity, src_pad,
  64                                      &tx->sd.entity, ADV748X_CSI2_SINK,
  65                                      enabled);
  66 }
  67
  68 /* -----------------------------------------------------------------------------
  69  * v4l2_subdev_internal_ops
  70  *
  71  * We use the internal registered operation to be able to ensure that our
  72  * incremental subdevices (not connected in the forward path) can be registered
  73  * against the resulting video path and media device.
  74  */
  75
  76 static int adv748x_csi2_registered(struct v4l2_subdev *sd)
  77 {
  78         struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
  79         struct adv748x_state *state = tx->state;
  80
  81         adv_dbg(state, "Registered %s (%s)", is_txa(tx) ? "TXA":"TXB",
  82                         sd->name);
  83
  84         /*
  85          * The adv748x hardware allows the AFE to route through the TXA, however
  86          * this is not currently supported in this driver.
  87          *
  88          * Link HDMI->TXA, and AFE->TXB directly.
  89          */
  90         if (is_txa(tx)) {
  91                 return adv748x_csi2_register_link(tx, sd->v4l2_dev,
  92                                                   &state->hdmi.sd,
  93                                                   ADV748X_HDMI_SOURCE);
  94         } else {
  95                 return adv748x_csi2_register_link(tx, sd->v4l2_dev,
  96                                                   &state->afe.sd,
  97                                                   ADV748X_AFE_SOURCE);
  98         }
  99 }
 100
 101 static const struct v4l2_subdev_internal_ops adv748x_csi2_internal_ops = {
 102         .registered = adv748x_csi2_registered,
 103 };
 104
 105 /* -----------------------------------------------------------------------------
 106  * v4l2_subdev_video_ops
 107  */
 108
 109 static int adv748x_csi2_s_stream(struct v4l2_subdev *sd, int enable)
 110 {
 111         struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
 112         struct v4l2_subdev *src;
 113
 114         src = adv748x_get_remote_sd(&tx->pads[ADV748X_CSI2_SINK]);
 115         if (!src)
 116                 return -EPIPE;
 117
 118         return v4l2_subdev_call(src, video, s_stream, enable);
 119 }
 120
 121 static const struct v4l2_subdev_video_ops adv748x_csi2_video_ops = {
 122         .s_stream = adv748x_csi2_s_stream,
 123 };
 124
 125 /* -----------------------------------------------------------------------------
 126  * v4l2_subdev_pad_ops
 127  *
 128  * The CSI2 bus pads are ignorant to the data sizes or formats.
 129  * But we must support setting the pad formats for format propagation.
 130  */
 131
 132 static struct v4l2_mbus_framefmt *
 133 adv748x_csi2_get_pad_format(struct v4l2_subdev *sd,
 134                             struct v4l2_subdev_pad_config *cfg,
 135                             unsigned int pad, u32 which)
 136 {
 137         struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
 138
 139         if (which == V4L2_SUBDEV_FORMAT_TRY)
 140                 return v4l2_subdev_get_try_format(sd, cfg, pad);
 141
 142         return &tx->format;
 143 }
 144
 145 static int adv748x_csi2_get_format(struct v4l2_subdev *sd,
 146                                    struct v4l2_subdev_pad_config *cfg,
 147                                    struct v4l2_subdev_format *sdformat)
 148 {
 149         struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
 150         struct adv748x_state *state = tx->state;
 151         struct v4l2_mbus_framefmt *mbusformat;
 152
 153         mbusformat = adv748x_csi2_get_pad_format(sd, cfg, sdformat->pad,
 154                                                  sdformat->which);
 155         if (!mbusformat)
 156                 return -EINVAL;
 157
 158         mutex_lock(&state->mutex);
 159
 160         sdformat->format = *mbusformat;
 161
 162         mutex_unlock(&state->mutex);
 163
 164         return 0;
 165 }
 166
 167 static int adv748x_csi2_set_format(struct v4l2_subdev *sd,
 168                                    struct v4l2_subdev_pad_config *cfg,
 169                                    struct v4l2_subdev_format *sdformat)
 170 {
 171         struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
 172         struct adv748x_state *state = tx->state;
 173         struct v4l2_mbus_framefmt *mbusformat;
 174         int ret = 0;
 175
 176         mbusformat = adv748x_csi2_get_pad_format(sd, cfg, sdformat->pad,
 177                                                  sdformat->which);
 178         if (!mbusformat)
 179                 return -EINVAL;
 180
 181         mutex_lock(&state->mutex);
 182
 183         if (sdformat->pad == ADV748X_CSI2_SOURCE) {
 184                 const struct v4l2_mbus_framefmt *sink_fmt;
 185
 186                 sink_fmt = adv748x_csi2_get_pad_format(sd, cfg,
 187                                                        ADV748X_CSI2_SINK,
 188                                                        sdformat->which);
 189
 190                 if (!sink_fmt) {
 191                         ret = -EINVAL;
 192                         goto unlock;
 193                 }
 194
 195                 sdformat->format = *sink_fmt;
 196         }
 197
 198         *mbusformat = sdformat->format;
 199
 200 unlock:
 201         mutex_unlock(&state->mutex);
 202
 203         return ret;
 204 }
 205
 206 static const struct v4l2_subdev_pad_ops adv748x_csi2_pad_ops = {
 207         .get_fmt = adv748x_csi2_get_format,
 208         .set_fmt = adv748x_csi2_set_format,
 209 };
 210
 211 /* -----------------------------------------------------------------------------
 212  * v4l2_subdev_ops
 213  */
 214
 215 static const struct v4l2_subdev_ops adv748x_csi2_ops = {
 216         .video = &adv748x_csi2_video_ops,
 217         .pad = &adv748x_csi2_pad_ops,
 218 };
 219
 220 /* -----------------------------------------------------------------------------
 221  * Subdev module and controls
 222  */
 223
 224 int adv748x_csi2_set_pixelrate(struct v4l2_subdev *sd, s64 rate)
 225 {
 226         struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
 227
 228         if (!tx->pixel_rate)
 229                 return -EINVAL;
 230
 231         return v4l2_ctrl_s_ctrl_int64(tx->pixel_rate, rate);
 232 }
 233
 234 static int adv748x_csi2_s_ctrl(struct v4l2_ctrl *ctrl)
 235 {
 236         switch (ctrl->id) {
 237         case V4L2_CID_PIXEL_RATE:
 238                 return 0;
 239         default:
 240                 return -EINVAL;
 241         }
 242 }
 243
 244 static const struct v4l2_ctrl_ops adv748x_csi2_ctrl_ops = {
 245         .s_ctrl = adv748x_csi2_s_ctrl,
 246 };
 247
 248 static int adv748x_csi2_init_controls(struct adv748x_csi2 *tx)
 249 {
 250
 251         v4l2_ctrl_handler_init(&tx->ctrl_hdl, 1);
 252
 253         tx->pixel_rate = v4l2_ctrl_new_std(&tx->ctrl_hdl,
 254                                            &adv748x_csi2_ctrl_ops,
 255                                            V4L2_CID_PIXEL_RATE, 1, INT_MAX,
 256                                            1, 1);
 257
 258         tx->sd.ctrl_handler = &tx->ctrl_hdl;
 259         if (tx->ctrl_hdl.error) {
 260                 v4l2_ctrl_handler_free(&tx->ctrl_hdl);
 261                 return tx->ctrl_hdl.error;
 262         }
 263
 264         return v4l2_ctrl_handler_setup(&tx->ctrl_hdl);
 265 }
 266
 267 int adv748x_csi2_init(struct adv748x_state *state, struct adv748x_csi2 *tx)
 268 {
 269         struct device_node *ep;
 270         int ret;
 271
 272         /* We can not use container_of to get back to the state with two TXs */
 273         tx->state = state;
 274         tx->page = is_txa(tx) ? ADV748X_PAGE_TXA : ADV748X_PAGE_TXB;
 275
 276         ep = state->endpoints[is_txa(tx) ? ADV748X_PORT_TXA : ADV748X_PORT_TXB];
 277         if (!ep) {
 278                 adv_err(state, "No endpoint found for %s\n",
 279                                 is_txa(tx) ? "txa" : "txb");
 280                 return -ENODEV;
 281         }
 282
 283         /* Initialise the virtual channel */
 284         adv748x_csi2_set_virtual_channel(tx, 0);
 285
 286         adv748x_subdev_init(&tx->sd, state, &adv748x_csi2_ops,
 287                             MEDIA_ENT_F_UNKNOWN,
 288                             is_txa(tx) ? "txa" : "txb");
 289
 290         /* Ensure that matching is based upon the endpoint fwnodes */
 291         tx->sd.fwnode = of_fwnode_handle(ep);
 292
 293         /* Register internal ops for incremental subdev registration */
 294         tx->sd.internal_ops = &adv748x_csi2_internal_ops;
 295
 296         tx->pads[ADV748X_CSI2_SINK].flags = MEDIA_PAD_FL_SINK;
 297         tx->pads[ADV748X_CSI2_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
 298
 299         ret = media_entity_pads_init(&tx->sd.entity, ADV748X_CSI2_NR_PADS,
 300                                      tx->pads);
 301         if (ret)
 302                 return ret;
 303
 304         ret = adv748x_csi2_init_controls(tx);
 305         if (ret)
 306                 goto err_free_media;
 307
 308         ret = v4l2_async_register_subdev(&tx->sd);
 309         if (ret)
 310                 goto err_free_ctrl;
 311
 312         return 0;
 313
 314 err_free_ctrl:
 315         v4l2_ctrl_handler_free(&tx->ctrl_hdl);
 316 err_free_media:
 317         media_entity_cleanup(&tx->sd.entity);
 318
 319         return ret;
 320 }
 321
 322 void adv748x_csi2_cleanup(struct adv748x_csi2 *tx)
 323 {
 324         v4l2_async_unregister_subdev(&tx->sd);
 325         media_entity_cleanup(&tx->sd.entity);
 326         v4l2_ctrl_handler_free(&tx->ctrl_hdl);
 327 }