drivers/media/radio/radio-maxiradio.c

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