drivers/media/radio/radio-isa.h

   1 /*
   2  * Framework for ISA radio drivers.
   3  * This takes care of all the V4L2 scaffolding, allowing the ISA drivers
   4  * to concentrate on the actual hardware operation.
   5  *
   6  * Copyright (C) 2012 Hans Verkuil <hans.verkuil@cisco.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  */
  22
  23 #ifndef _RADIO_ISA_H_
  24 #define _RADIO_ISA_H_
  25
  26 #include <linux/isa.h>
  27 #include <linux/pnp.h>
  28 #include <linux/videodev2.h>
  29 #include <media/v4l2-device.h>
  30 #include <media/v4l2-ctrls.h>
  31
  32 struct radio_isa_driver;
  33 struct radio_isa_ops;
  34
  35 /* Core structure for radio ISA cards */
  36 struct radio_isa_card {
  37         const struct radio_isa_driver *drv;
  38         struct v4l2_device v4l2_dev;
  39         struct v4l2_ctrl_handler hdl;
  40         struct video_device vdev;
  41         struct mutex lock;
  42         const struct radio_isa_ops *ops;
  43         struct {        /* mute/volume cluster */
  44                 struct v4l2_ctrl *mute;
  45                 struct v4l2_ctrl *volume;
  46         };
  47         /* I/O port */
  48         int io;
  49
  50         /* Card is in stereo audio mode */
  51         bool stereo;
  52         /* Current frequency */
  53         u32 freq;
  54 };
  55
  56 struct radio_isa_ops {
  57         /* Allocate and initialize a radio_isa_card struct */
  58         struct radio_isa_card *(*alloc)(void);
  59         /* Probe whether a card is present at the given port */
  60         bool (*probe)(struct radio_isa_card *isa, int io);
  61         /* Special card initialization can be done here, this is called after
  62          * the standard controls are registered, but before they are setup,
  63          * thus allowing drivers to add their own controls here. */
  64         int (*init)(struct radio_isa_card *isa);
  65         /* Set mute and volume. */
  66         int (*s_mute_volume)(struct radio_isa_card *isa, bool mute, int volume);
  67         /* Set frequency */
  68         int (*s_frequency)(struct radio_isa_card *isa, u32 freq);
  69         /* Set stereo/mono audio mode */
  70         int (*s_stereo)(struct radio_isa_card *isa, bool stereo);
  71         /* Get rxsubchans value for VIDIOC_G_TUNER */
  72         u32 (*g_rxsubchans)(struct radio_isa_card *isa);
  73         /* Get the signal strength for VIDIOC_G_TUNER */
  74         u32 (*g_signal)(struct radio_isa_card *isa);
  75 };
  76
  77 /* Top level structure needed to instantiate the cards */
  78 struct radio_isa_driver {
  79         struct isa_driver driver;
  80 #ifdef CONFIG_PNP
  81         struct pnp_driver pnp_driver;
  82 #endif
  83         const struct radio_isa_ops *ops;
  84         /* The module_param_array with the specified I/O ports */
  85         int *io_params;
  86         /* The module_param_array with the radio_nr values */
  87         int *radio_nr_params;
  88         /* Whether we should probe for possible cards */
  89         bool probe;
  90         /* The list of possible I/O ports */
  91         const int *io_ports;
  92         /* The size of that list */
  93         int num_of_io_ports;
  94         /* The region size to request */
  95         unsigned region_size;
  96         /* The name of the card */
  97         const char *card;
  98         /* Card can capture stereo audio */
  99         bool has_stereo;
 100         /* The maximum volume for the volume control. If 0, then there
 101            is no volume control possible. */
 102         int max_volume;
 103 };
 104
 105 int radio_isa_match(struct device *pdev, unsigned int dev);
 106 int radio_isa_probe(struct device *pdev, unsigned int dev);
 107 int radio_isa_remove(struct device *pdev, unsigned int dev);
 108 #ifdef CONFIG_PNP
 109 int radio_isa_pnp_probe(struct pnp_dev *dev,
 110                         const struct pnp_device_id *dev_id);
 111 void radio_isa_pnp_remove(struct pnp_dev *dev);
 112 #endif
 113
 114 #endif