204 lines
5.4 KiB
C
204 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Guillemot Maxi Radio FM 2000 PCI radio card driver for Linux
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* (C) 2001 Dimitromanolakis Apostolos <apdim@grecian.net>
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*
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* Based in the radio Maestro PCI driver. Actually it uses the same chip
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* for radio but different pci controller.
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*
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* I didn't have any specs I reversed engineered the protocol from
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* the windows driver (radio.dll).
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*
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* The card uses the TEA5757 chip that includes a search function but it
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* is useless as I haven't found any way to read back the frequency. If
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* anybody does please mail me.
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*
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* For the pdf file see:
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* http://www.nxp.com/acrobat_download2/expired_datasheets/TEA5757_5759_3.pdf
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*
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*
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* CHANGES:
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* 0.75b
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* - better pci interface thanks to Francois Romieu <romieu@cogenit.fr>
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*
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* 0.75 Sun Feb 4 22:51:27 EET 2001
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* - tiding up
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* - removed support for multiple devices as it didn't work anyway
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*
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* BUGS:
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* - card unmutes if you change frequency
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*
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* (c) 2006, 2007 by Mauro Carvalho Chehab <mchehab@kernel.org>:
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* - Conversion to V4L2 API
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* - Uses video_ioctl2 for parsing and to add debug support
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <linux/pci.h>
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#include <linux/videodev2.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <media/drv-intf/tea575x.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-fh.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-event.h>
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MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
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MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000.");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("1.0.0");
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static int radio_nr = -1;
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module_param(radio_nr, int, 0644);
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MODULE_PARM_DESC(radio_nr, "Radio device number");
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/* TEA5757 pin mappings */
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static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16;
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static atomic_t maxiradio_instance = ATOMIC_INIT(0);
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#define PCI_VENDOR_ID_GUILLEMOT 0x5046
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#define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
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struct maxiradio
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{
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struct snd_tea575x tea;
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struct v4l2_device v4l2_dev;
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struct pci_dev *pdev;
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u16 io; /* base of radio io */
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};
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static inline struct maxiradio *to_maxiradio(struct v4l2_device *v4l2_dev)
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{
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return container_of(v4l2_dev, struct maxiradio, v4l2_dev);
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}
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static void maxiradio_tea575x_set_pins(struct snd_tea575x *tea, u8 pins)
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{
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struct maxiradio *dev = tea->private_data;
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u8 bits = 0;
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bits |= (pins & TEA575X_DATA) ? data : 0;
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bits |= (pins & TEA575X_CLK) ? clk : 0;
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bits |= (pins & TEA575X_WREN) ? wren : 0;
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bits |= power;
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outb(bits, dev->io);
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}
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/* Note: this card cannot read out the data of the shift registers,
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only the mono/stereo pin works. */
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static u8 maxiradio_tea575x_get_pins(struct snd_tea575x *tea)
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{
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struct maxiradio *dev = tea->private_data;
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u8 bits = inb(dev->io);
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return ((bits & data) ? TEA575X_DATA : 0) |
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((bits & mo_st) ? TEA575X_MOST : 0);
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}
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static void maxiradio_tea575x_set_direction(struct snd_tea575x *tea, bool output)
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{
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}
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static const struct snd_tea575x_ops maxiradio_tea_ops = {
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.set_pins = maxiradio_tea575x_set_pins,
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.get_pins = maxiradio_tea575x_get_pins,
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.set_direction = maxiradio_tea575x_set_direction,
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};
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static int maxiradio_probe(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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struct maxiradio *dev;
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struct v4l2_device *v4l2_dev;
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int retval = -ENOMEM;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (dev == NULL) {
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dev_err(&pdev->dev, "not enough memory\n");
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return -ENOMEM;
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}
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v4l2_dev = &dev->v4l2_dev;
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v4l2_device_set_name(v4l2_dev, "maxiradio", &maxiradio_instance);
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retval = v4l2_device_register(&pdev->dev, v4l2_dev);
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if (retval < 0) {
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v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
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goto errfr;
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}
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dev->tea.private_data = dev;
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dev->tea.ops = &maxiradio_tea_ops;
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/* The data pin cannot be read. This may be a hardware limitation, or
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we just don't know how to read it. */
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dev->tea.cannot_read_data = true;
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dev->tea.v4l2_dev = v4l2_dev;
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dev->tea.radio_nr = radio_nr;
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strscpy(dev->tea.card, "Maxi Radio FM2000", sizeof(dev->tea.card));
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retval = -ENODEV;
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if (!request_region(pci_resource_start(pdev, 0),
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pci_resource_len(pdev, 0), v4l2_dev->name)) {
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dev_err(&pdev->dev, "can't reserve I/O ports\n");
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goto err_hdl;
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}
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if (pci_enable_device(pdev))
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goto err_out_free_region;
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dev->io = pci_resource_start(pdev, 0);
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if (snd_tea575x_init(&dev->tea, THIS_MODULE)) {
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printk(KERN_ERR "radio-maxiradio: Unable to detect TEA575x tuner\n");
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goto err_out_free_region;
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}
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return 0;
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err_out_free_region:
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release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
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err_hdl:
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v4l2_device_unregister(v4l2_dev);
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errfr:
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kfree(dev);
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return retval;
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}
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static void maxiradio_remove(struct pci_dev *pdev)
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{
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struct v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
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struct maxiradio *dev = to_maxiradio(v4l2_dev);
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snd_tea575x_exit(&dev->tea);
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/* Turn off power */
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outb(0, dev->io);
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v4l2_device_unregister(v4l2_dev);
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release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
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kfree(dev);
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}
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static const struct pci_device_id maxiradio_pci_tbl[] = {
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{ PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
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PCI_ANY_ID, PCI_ANY_ID, },
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{ 0 }
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};
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MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
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static struct pci_driver maxiradio_driver = {
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.name = "radio-maxiradio",
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.id_table = maxiradio_pci_tbl,
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.probe = maxiradio_probe,
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.remove = maxiradio_remove,
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};
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module_pci_driver(maxiradio_driver);
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