LCOV - code coverage report
Current view: top level - drivers/media/v4l2-core - v4l2-i2c.c (source / functions) Hit Total Coverage
Test: gcov_data_raspi2_real_modules_combined.info Lines: 0 44 0.0 %
Date: 2020-09-30 20:25:40 Functions: 0 7 0.0 %
Branches: 0 33 0.0 %

           Branch data     Line data    Source code
       1                 :            : // SPDX-License-Identifier: GPL-2.0-or-later
       2                 :            : /*
       3                 :            :  * v4l2-i2c - I2C helpers for Video4Linux2
       4                 :            :  */
       5                 :            : 
       6                 :            : #include <linux/i2c.h>
       7                 :            : #include <linux/module.h>
       8                 :            : #include <media/v4l2-common.h>
       9                 :            : #include <media/v4l2-device.h>
      10                 :            : 
      11                 :          0 : void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd)
      12                 :            : {
      13                 :            :         struct i2c_client *client = v4l2_get_subdevdata(sd);
      14                 :            : 
      15                 :            :         /*
      16                 :            :          * We need to unregister the i2c client
      17                 :            :          * explicitly. We cannot rely on
      18                 :            :          * i2c_del_adapter to always unregister
      19                 :            :          * clients for us, since if the i2c bus is a
      20                 :            :          * platform bus, then it is never deleted.
      21                 :            :          *
      22                 :            :          * Device tree or ACPI based devices must not
      23                 :            :          * be unregistered as they have not been
      24                 :            :          * registered by us, and would not be
      25                 :            :          * re-created by just probing the V4L2 driver.
      26                 :            :          */
      27   [ #  #  #  #  :          0 :         if (client && !client->dev.of_node && !client->dev.fwnode)
                   #  # ]
      28                 :          0 :                 i2c_unregister_device(client);
      29                 :          0 : }
      30                 :            : 
      31                 :          0 : void v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd,
      32                 :            :                               struct i2c_client *client,
      33                 :            :                               const char *devname, const char *postfix)
      34                 :            : {
      35         [ #  # ]:          0 :         if (!devname)
      36                 :          0 :                 devname = client->dev.driver->name;
      37         [ #  # ]:          0 :         if (!postfix)
      38                 :            :                 postfix = "";
      39                 :            : 
      40                 :          0 :         snprintf(sd->name, sizeof(sd->name), "%s%s %d-%04x", devname, postfix,
      41                 :          0 :                  i2c_adapter_id(client->adapter), client->addr);
      42                 :          0 : }
      43                 :            : EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_set_name);
      44                 :            : 
      45                 :          0 : void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client,
      46                 :            :                           const struct v4l2_subdev_ops *ops)
      47                 :            : {
      48                 :          0 :         v4l2_subdev_init(sd, ops);
      49                 :          0 :         sd->flags |= V4L2_SUBDEV_FL_IS_I2C;
      50                 :            :         /* the owner is the same as the i2c_client's driver owner */
      51                 :          0 :         sd->owner = client->dev.driver->owner;
      52                 :          0 :         sd->dev = &client->dev;
      53                 :            :         /* i2c_client and v4l2_subdev point to one another */
      54                 :            :         v4l2_set_subdevdata(sd, client);
      55                 :            :         i2c_set_clientdata(client, sd);
      56                 :          0 :         v4l2_i2c_subdev_set_name(sd, client, NULL, NULL);
      57                 :          0 : }
      58                 :            : EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_init);
      59                 :            : 
      60                 :            : /* Load an i2c sub-device. */
      61                 :            : struct v4l2_subdev
      62                 :          0 : *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
      63                 :            :                            struct i2c_adapter *adapter,
      64                 :            :                            struct i2c_board_info *info,
      65                 :            :                            const unsigned short *probe_addrs)
      66                 :            : {
      67                 :            :         struct v4l2_subdev *sd = NULL;
      68                 :            :         struct i2c_client *client;
      69                 :            : 
      70         [ #  # ]:          0 :         if (!v4l2_dev)
      71                 :            :                 return NULL;
      72                 :            : 
      73                 :          0 :         request_module(I2C_MODULE_PREFIX "%s", info->type);
      74                 :            : 
      75                 :            :         /* Create the i2c client */
      76   [ #  #  #  # ]:          0 :         if (info->addr == 0 && probe_addrs)
      77                 :          0 :                 client = i2c_new_probed_device(adapter, info, probe_addrs,
      78                 :            :                                                NULL);
      79                 :            :         else
      80                 :          0 :                 client = i2c_new_device(adapter, info);
      81                 :            : 
      82                 :            :         /*
      83                 :            :          * Note: by loading the module first we are certain that c->driver
      84                 :            :          * will be set if the driver was found. If the module was not loaded
      85                 :            :          * first, then the i2c core tries to delay-load the module for us,
      86                 :            :          * and then c->driver is still NULL until the module is finally
      87                 :            :          * loaded. This delay-load mechanism doesn't work if other drivers
      88                 :            :          * want to use the i2c device, so explicitly loading the module
      89                 :            :          * is the best alternative.
      90                 :            :          */
      91   [ #  #  #  # ]:          0 :         if (!client || !client->dev.driver)
      92                 :            :                 goto error;
      93                 :            : 
      94                 :            :         /* Lock the module so we can safely get the v4l2_subdev pointer */
      95         [ #  # ]:          0 :         if (!try_module_get(client->dev.driver->owner))
      96                 :            :                 goto error;
      97                 :            :         sd = i2c_get_clientdata(client);
      98                 :            : 
      99                 :            :         /*
     100                 :            :          * Register with the v4l2_device which increases the module's
     101                 :            :          * use count as well.
     102                 :            :          */
     103         [ #  # ]:          0 :         if (v4l2_device_register_subdev(v4l2_dev, sd))
     104                 :            :                 sd = NULL;
     105                 :            :         /* Decrease the module use count to match the first try_module_get. */
     106                 :          0 :         module_put(client->dev.driver->owner);
     107                 :            : 
     108                 :            : error:
     109                 :            :         /*
     110                 :            :          * If we have a client but no subdev, then something went wrong and
     111                 :            :          * we must unregister the client.
     112                 :            :          */
     113         [ #  # ]:          0 :         if (client && !sd)
     114                 :          0 :                 i2c_unregister_device(client);
     115                 :          0 :         return sd;
     116                 :            : }
     117                 :            : EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev_board);
     118                 :            : 
     119                 :          0 : struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev,
     120                 :            :                                         struct i2c_adapter *adapter,
     121                 :            :                                         const char *client_type,
     122                 :            :                                         u8 addr,
     123                 :            :                                         const unsigned short *probe_addrs)
     124                 :            : {
     125                 :            :         struct i2c_board_info info;
     126                 :            : 
     127                 :            :         /*
     128                 :            :          * Setup the i2c board info with the device type and
     129                 :            :          * the device address.
     130                 :            :          */
     131                 :          0 :         memset(&info, 0, sizeof(info));
     132                 :          0 :         strscpy(info.type, client_type, sizeof(info.type));
     133                 :          0 :         info.addr = addr;
     134                 :            : 
     135                 :          0 :         return v4l2_i2c_new_subdev_board(v4l2_dev, adapter, &info,
     136                 :            :                                          probe_addrs);
     137                 :            : }
     138                 :            : EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev);
     139                 :            : 
     140                 :            : /* Return i2c client address of v4l2_subdev. */
     141                 :          0 : unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd)
     142                 :            : {
     143                 :            :         struct i2c_client *client = v4l2_get_subdevdata(sd);
     144                 :            : 
     145         [ #  # ]:          0 :         return client ? client->addr : I2C_CLIENT_END;
     146                 :            : }
     147                 :            : EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_addr);
     148                 :            : 
     149                 :            : /*
     150                 :            :  * Return a list of I2C tuner addresses to probe. Use only if the tuner
     151                 :            :  * addresses are unknown.
     152                 :            :  */
     153                 :          0 : const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type)
     154                 :            : {
     155                 :            :         static const unsigned short radio_addrs[] = {
     156                 :            : #if IS_ENABLED(CONFIG_MEDIA_TUNER_TEA5761)
     157                 :            :                 0x10,
     158                 :            : #endif
     159                 :            :                 0x60,
     160                 :            :                 I2C_CLIENT_END
     161                 :            :         };
     162                 :            :         static const unsigned short demod_addrs[] = {
     163                 :            :                 0x42, 0x43, 0x4a, 0x4b,
     164                 :            :                 I2C_CLIENT_END
     165                 :            :         };
     166                 :            :         static const unsigned short tv_addrs[] = {
     167                 :            :                 0x42, 0x43, 0x4a, 0x4b,         /* tda8290 */
     168                 :            :                 0x60, 0x61, 0x62, 0x63, 0x64,
     169                 :            :                 I2C_CLIENT_END
     170                 :            :         };
     171                 :            : 
     172   [ #  #  #  #  :          0 :         switch (type) {
                      # ]
     173                 :            :         case ADDRS_RADIO:
     174                 :            :                 return radio_addrs;
     175                 :            :         case ADDRS_DEMOD:
     176                 :          0 :                 return demod_addrs;
     177                 :            :         case ADDRS_TV:
     178                 :          0 :                 return tv_addrs;
     179                 :            :         case ADDRS_TV_WITH_DEMOD:
     180                 :          0 :                 return tv_addrs + 4;
     181                 :            :         }
     182                 :          0 :         return NULL;
     183                 :            : }
     184                 :            : EXPORT_SYMBOL_GPL(v4l2_i2c_tuner_addrs);

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