root/drivers/media/radio/radio-maxiradio.c

DEFINITIONS

1. to_maxiradio
2. maxiradio_tea575x_set_pins
3. maxiradio_tea575x_get_pins
4. maxiradio_tea575x_set_direction
5. maxiradio_probe
6. maxiradio_remove

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Guillemot Maxi Radio FM 2000 PCI radio card driver for Linux
   4  * (C) 2001 Dimitromanolakis Apostolos <apdim@grecian.net>
   5  *
   6  * Based in the radio Maestro PCI driver. Actually it uses the same chip
   7  * for radio but different pci controller.
   8  *
   9  * I didn't have any specs I reversed engineered the protocol from
  10  * the windows driver (radio.dll).
  11  *
  12  * The card uses the TEA5757 chip that includes a search function but it
  13  * is useless as I haven't found any way to read back the frequency. If
  14  * anybody does please mail me.
  15  *
  16  * For the pdf file see:
  17  * http://www.nxp.com/acrobat_download2/expired_datasheets/TEA5757_5759_3.pdf
  18  *
  19  *
  20  * CHANGES:
  21  *   0.75b
  22  *     - better pci interface thanks to Francois Romieu <romieu@cogenit.fr>
  23  *
  24  *   0.75      Sun Feb  4 22:51:27 EET 2001
  25  *     - tiding up
  26  *     - removed support for multiple devices as it didn't work anyway
  27  *
  28  * BUGS:
  29  *   - card unmutes if you change frequency
  30  *
  31  * (c) 2006, 2007 by Mauro Carvalho Chehab <mchehab@kernel.org>:
  32  *      - Conversion to V4L2 API
  33  *      - Uses video_ioctl2 for parsing and to add debug support
  34  */
  35 
  36 
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/ioport.h>
  40 #include <linux/delay.h>
  41 #include <linux/mutex.h>
  42 #include <linux/pci.h>
  43 #include <linux/videodev2.h>
  44 #include <linux/io.h>
  45 #include <linux/slab.h>
  46 #include <media/drv-intf/tea575x.h>
  47 #include <media/v4l2-device.h>
  48 #include <media/v4l2-ioctl.h>
  49 #include <media/v4l2-fh.h>
  50 #include <media/v4l2-ctrls.h>
  51 #include <media/v4l2-event.h>
  52 
  53 MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
  54 MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000.");
  55 MODULE_LICENSE("GPL");
  56 MODULE_VERSION("1.0.0");
  57 
  58 static int radio_nr = -1;
  59 module_param(radio_nr, int, 0644);
  60 MODULE_PARM_DESC(radio_nr, "Radio device number");
  61 
  62 /* TEA5757 pin mappings */
  63 static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16;
  64 
  65 static atomic_t maxiradio_instance = ATOMIC_INIT(0);
  66 
  67 #define PCI_VENDOR_ID_GUILLEMOT 0x5046
  68 #define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
  69 
  70 struct maxiradio
  71 {
  72         struct snd_tea575x tea;
  73         struct v4l2_device v4l2_dev;
  74         struct pci_dev *pdev;
  75 
  76         u16     io;     /* base of radio io */
  77 };
  78 
  79 static inline struct maxiradio *to_maxiradio(struct v4l2_device *v4l2_dev)
  80 {
  81         return container_of(v4l2_dev, struct maxiradio, v4l2_dev);
  82 }
  83 
  84 static void maxiradio_tea575x_set_pins(struct snd_tea575x *tea, u8 pins)
  85 {
  86         struct maxiradio *dev = tea->private_data;
  87         u8 bits = 0;
  88 
  89         bits |= (pins & TEA575X_DATA) ? data : 0;
  90         bits |= (pins & TEA575X_CLK)  ? clk  : 0;
  91         bits |= (pins & TEA575X_WREN) ? wren : 0;
  92         bits |= power;
  93 
  94         outb(bits, dev->io);
  95 }
  96 
  97 /* Note: this card cannot read out the data of the shift registers,
  98    only the mono/stereo pin works. */
  99 static u8 maxiradio_tea575x_get_pins(struct snd_tea575x *tea)
 100 {
 101         struct maxiradio *dev = tea->private_data;
 102         u8 bits = inb(dev->io);
 103 
 104         return  ((bits & data) ? TEA575X_DATA : 0) |
 105                 ((bits & mo_st) ? TEA575X_MOST : 0);
 106 }
 107 
 108 static void maxiradio_tea575x_set_direction(struct snd_tea575x *tea, bool output)
 109 {
 110 }
 111 
 112 static const struct snd_tea575x_ops maxiradio_tea_ops = {
 113         .set_pins = maxiradio_tea575x_set_pins,
 114         .get_pins = maxiradio_tea575x_get_pins,
 115         .set_direction = maxiradio_tea575x_set_direction,
 116 };
 117 
 118 static int maxiradio_probe(struct pci_dev *pdev,
 119                            const struct pci_device_id *ent)
 120 {
 121         struct maxiradio *dev;
 122         struct v4l2_device *v4l2_dev;
 123         int retval = -ENOMEM;
 124 
 125         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 126         if (dev == NULL) {
 127                 dev_err(&pdev->dev, "not enough memory\n");
 128                 return -ENOMEM;
 129         }
 130 
 131         v4l2_dev = &dev->v4l2_dev;
 132         v4l2_device_set_name(v4l2_dev, "maxiradio", &maxiradio_instance);
 133 
 134         retval = v4l2_device_register(&pdev->dev, v4l2_dev);
 135         if (retval < 0) {
 136                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 137                 goto errfr;
 138         }
 139         dev->tea.private_data = dev;
 140         dev->tea.ops = &maxiradio_tea_ops;
 141         /* The data pin cannot be read. This may be a hardware limitation, or
 142            we just don't know how to read it. */
 143         dev->tea.cannot_read_data = true;
 144         dev->tea.v4l2_dev = v4l2_dev;
 145         dev->tea.radio_nr = radio_nr;
 146         strscpy(dev->tea.card, "Maxi Radio FM2000", sizeof(dev->tea.card));
 147         snprintf(dev->tea.bus_info, sizeof(dev->tea.bus_info),
 148                         "PCI:%s", pci_name(pdev));
 149 
 150         retval = -ENODEV;
 151 
 152         if (!request_region(pci_resource_start(pdev, 0),
 153                            pci_resource_len(pdev, 0), v4l2_dev->name)) {
 154                 dev_err(&pdev->dev, "can't reserve I/O ports\n");
 155                 goto err_hdl;
 156         }
 157 
 158         if (pci_enable_device(pdev))
 159                 goto err_out_free_region;
 160 
 161         dev->io = pci_resource_start(pdev, 0);
 162         if (snd_tea575x_init(&dev->tea, THIS_MODULE)) {
 163                 printk(KERN_ERR "radio-maxiradio: Unable to detect TEA575x tuner\n");
 164                 goto err_out_free_region;
 165         }
 166         return 0;
 167 
 168 err_out_free_region:
 169         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 170 err_hdl:
 171         v4l2_device_unregister(v4l2_dev);
 172 errfr:
 173         kfree(dev);
 174         return retval;
 175 }
 176 
 177 static void maxiradio_remove(struct pci_dev *pdev)
 178 {
 179         struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev);
 180         struct maxiradio *dev = to_maxiradio(v4l2_dev);
 181 
 182         snd_tea575x_exit(&dev->tea);
 183         /* Turn off power */
 184         outb(0, dev->io);
 185         v4l2_device_unregister(v4l2_dev);
 186         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 187         kfree(dev);
 188 }
 189 
 190 static const struct pci_device_id maxiradio_pci_tbl[] = {
 191         { PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
 192                 PCI_ANY_ID, PCI_ANY_ID, },
 193         { 0 }
 194 };
 195 
 196 MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
 197 
 198 static struct pci_driver maxiradio_driver = {
 199         .name           = "radio-maxiradio",
 200         .id_table       = maxiradio_pci_tbl,
 201         .probe          = maxiradio_probe,
 202         .remove         = maxiradio_remove,
 203 };
 204 
 205 module_pci_driver(maxiradio_driver);