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
to_maxiradio(struct v4l2_device * v4l2_dev)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
maxiradio_tea575x_set_pins(struct snd_tea575x * tea,u8 pins)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. */
maxiradio_tea575x_get_pins(struct snd_tea575x * tea)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
maxiradio_tea575x_set_direction(struct snd_tea575x * tea,bool output)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
maxiradio_probe(struct pci_dev * pdev,const struct pci_device_id * ent)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
148 retval = -ENODEV;
149
150 if (!request_region(pci_resource_start(pdev, 0),
151 pci_resource_len(pdev, 0), v4l2_dev->name)) {
152 dev_err(&pdev->dev, "can't reserve I/O ports\n");
153 goto err_hdl;
154 }
155
156 if (pci_enable_device(pdev))
157 goto err_out_free_region;
158
159 dev->io = pci_resource_start(pdev, 0);
160 if (snd_tea575x_init(&dev->tea, THIS_MODULE)) {
161 printk(KERN_ERR "radio-maxiradio: Unable to detect TEA575x tuner\n");
162 goto err_out_free_region;
163 }
164 return 0;
165
166 err_out_free_region:
167 release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
168 err_hdl:
169 v4l2_device_unregister(v4l2_dev);
170 errfr:
171 kfree(dev);
172 return retval;
173 }
174
maxiradio_remove(struct pci_dev * pdev)175 static void maxiradio_remove(struct pci_dev *pdev)
176 {
177 struct v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
178 struct maxiradio *dev = to_maxiradio(v4l2_dev);
179
180 snd_tea575x_exit(&dev->tea);
181 /* Turn off power */
182 outb(0, dev->io);
183 v4l2_device_unregister(v4l2_dev);
184 release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
185 kfree(dev);
186 }
187
188 static const struct pci_device_id maxiradio_pci_tbl[] = {
189 { PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
190 PCI_ANY_ID, PCI_ANY_ID, },
191 { 0 }
192 };
193
194 MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
195
196 static struct pci_driver maxiradio_driver = {
197 .name = "radio-maxiradio",
198 .id_table = maxiradio_pci_tbl,
199 .probe = maxiradio_probe,
200 .remove = maxiradio_remove,
201 };
202
203 module_pci_driver(maxiradio_driver);
204