Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/media/radio/radio-gemtek.c

  1 /*
  2  * GemTek radio card driver
  3  *
  4  * Copyright 1998 Jonas Munsin <jmunsin@iki.fi>
  5  *
  6  * GemTek hasn't released any specs on the card, so the protocol had to
  7  * be reverse engineered with dosemu.
  8  *
  9  * Besides the protocol changes, this is mostly a copy of:
 10  *
 11  *    RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
 12  *
 13  *    Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
 14  *    Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
 15  *    Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
 16  *
 17  * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
 18  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
 19  *
 20  * Note: this card seems to swap the left and right audio channels!
 21  *
 22  * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
 23  */
 24 
 25 #include <linux/module.h>       /* Modules                      */
 26 #include <linux/init.h>         /* Initdata                     */
 27 #include <linux/ioport.h>       /* request_region               */
 28 #include <linux/delay.h>        /* udelay                       */
 29 #include <linux/videodev2.h>    /* kernel radio structs         */
 30 #include <linux/mutex.h>
 31 #include <linux/io.h>           /* outb, outb_p                 */
 32 #include <linux/pnp.h>
 33 #include <linux/slab.h>
 34 #include <media/v4l2-ioctl.h>
 35 #include <media/v4l2-device.h>
 36 #include "radio-isa.h"
 37 
 38 /*
 39  * Module info.
 40  */
 41 
 42 MODULE_AUTHOR("Jonas Munsin, Pekka Seppänen <pexu@kapsi.fi>");
 43 MODULE_DESCRIPTION("A driver for the GemTek Radio card.");
 44 MODULE_LICENSE("GPL");
 45 MODULE_VERSION("1.0.0");
 46 
 47 /*
 48  * Module params.
 49  */
 50 
 51 #ifndef CONFIG_RADIO_GEMTEK_PORT
 52 #define CONFIG_RADIO_GEMTEK_PORT -1
 53 #endif
 54 #ifndef CONFIG_RADIO_GEMTEK_PROBE
 55 #define CONFIG_RADIO_GEMTEK_PROBE 1
 56 #endif
 57 
 58 #define GEMTEK_MAX 4
 59 
 60 static bool probe = CONFIG_RADIO_GEMTEK_PROBE;
 61 static bool hardmute;
 62 static int io[GEMTEK_MAX] = { [0] = CONFIG_RADIO_GEMTEK_PORT,
 63                               [1 ... (GEMTEK_MAX - 1)] = -1 };
 64 static int radio_nr[GEMTEK_MAX] = { [0 ... (GEMTEK_MAX - 1)] = -1 };
 65 
 66 module_param(probe, bool, 0444);
 67 MODULE_PARM_DESC(probe, "Enable automatic device probing.");
 68 
 69 module_param(hardmute, bool, 0644);
 70 MODULE_PARM_DESC(hardmute, "Enable 'hard muting' by shutting down PLL, may "
 71          "reduce static noise.");
 72 
 73 module_param_array(io, int, NULL, 0444);
 74 MODULE_PARM_DESC(io, "Force I/O ports for the GemTek Radio card if automatic "
 75          "probing is disabled or fails. The most common I/O ports are: 0x20c "
 76          "0x30c, 0x24c or 0x34c (0x20c, 0x248 and 0x28c have been reported to "
 77          "work for the combined sound/radiocard).");
 78 
 79 module_param_array(radio_nr, int, NULL, 0444);
 80 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
 81 
 82 /*
 83  * Frequency calculation constants.  Intermediate frequency 10.52 MHz (nominal
 84  * value 10.7 MHz), reference divisor 6.39 kHz (nominal 6.25 kHz).
 85  */
 86 #define FSCALE          8
 87 #define IF_OFFSET       ((unsigned int)(10.52 * 16000 * (1<<FSCALE)))
 88 #define REF_FREQ        ((unsigned int)(6.39 * 16 * (1<<FSCALE)))
 89 
 90 #define GEMTEK_CK               0x01    /* Clock signal                 */
 91 #define GEMTEK_DA               0x02    /* Serial data                  */
 92 #define GEMTEK_CE               0x04    /* Chip enable                  */
 93 #define GEMTEK_NS               0x08    /* No signal                    */
 94 #define GEMTEK_MT               0x10    /* Line mute                    */
 95 #define GEMTEK_STDF_3_125_KHZ   0x01    /* Standard frequency 3.125 kHz */
 96 #define GEMTEK_PLL_OFF          0x07    /* PLL off                      */
 97 
 98 #define BU2614_BUS_SIZE 32      /* BU2614 / BU2614FS bus size           */
 99 
100 #define SHORT_DELAY 5           /* usec */
101 #define LONG_DELAY 75           /* usec */
102 
103 struct gemtek {
104         struct radio_isa_card isa;
105         bool muted;
106         u32 bu2614data;
107 };
108 
109 #define BU2614_FREQ_BITS        16 /* D0..D15, Frequency data           */
110 #define BU2614_PORT_BITS        3 /* P0..P2, Output port control data   */
111 #define BU2614_VOID_BITS        4 /* unused                             */
112 #define BU2614_FMES_BITS        1 /* CT, Frequency measurement beginning data */
113 #define BU2614_STDF_BITS        3 /* R0..R2, Standard frequency data    */
114 #define BU2614_SWIN_BITS        1 /* S, Switch between FMIN / AMIN      */
115 #define BU2614_SWAL_BITS        1 /* PS, Swallow counter division (AMIN only)*/
116 #define BU2614_VOID2_BITS       1 /* unused                             */
117 #define BU2614_FMUN_BITS        1 /* GT, Frequency measurement time & unlock */
118 #define BU2614_TEST_BITS        1 /* TS, Test data is input             */
119 
120 #define BU2614_FREQ_SHIFT       0
121 #define BU2614_PORT_SHIFT       (BU2614_FREQ_BITS + BU2614_FREQ_SHIFT)
122 #define BU2614_VOID_SHIFT       (BU2614_PORT_BITS + BU2614_PORT_SHIFT)
123 #define BU2614_FMES_SHIFT       (BU2614_VOID_BITS + BU2614_VOID_SHIFT)
124 #define BU2614_STDF_SHIFT       (BU2614_FMES_BITS + BU2614_FMES_SHIFT)
125 #define BU2614_SWIN_SHIFT       (BU2614_STDF_BITS + BU2614_STDF_SHIFT)
126 #define BU2614_SWAL_SHIFT       (BU2614_SWIN_BITS + BU2614_SWIN_SHIFT)
127 #define BU2614_VOID2_SHIFT      (BU2614_SWAL_BITS + BU2614_SWAL_SHIFT)
128 #define BU2614_FMUN_SHIFT       (BU2614_VOID2_BITS + BU2614_VOID2_SHIFT)
129 #define BU2614_TEST_SHIFT       (BU2614_FMUN_BITS + BU2614_FMUN_SHIFT)
130 
131 #define MKMASK(field)   (((1<<BU2614_##field##_BITS) - 1) << \
132                         BU2614_##field##_SHIFT)
133 #define BU2614_PORT_MASK        MKMASK(PORT)
134 #define BU2614_FREQ_MASK        MKMASK(FREQ)
135 #define BU2614_VOID_MASK        MKMASK(VOID)
136 #define BU2614_FMES_MASK        MKMASK(FMES)
137 #define BU2614_STDF_MASK        MKMASK(STDF)
138 #define BU2614_SWIN_MASK        MKMASK(SWIN)
139 #define BU2614_SWAL_MASK        MKMASK(SWAL)
140 #define BU2614_VOID2_MASK       MKMASK(VOID2)
141 #define BU2614_FMUN_MASK        MKMASK(FMUN)
142 #define BU2614_TEST_MASK        MKMASK(TEST)
143 
144 /*
145  * Set data which will be sent to BU2614FS.
146  */
147 #define gemtek_bu2614_set(dev, field, data) ((dev)->bu2614data = \
148         ((dev)->bu2614data & ~field##_MASK) | ((data) << field##_SHIFT))
149 
150 /*
151  * Transmit settings to BU2614FS over GemTek IC.
152  */
153 static void gemtek_bu2614_transmit(struct gemtek *gt)
154 {
155         struct radio_isa_card *isa = &gt->isa;
156         int i, bit, q, mute;
157 
158         mute = gt->muted ? GEMTEK_MT : 0x00;
159 
160         outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, isa->io);
161         udelay(LONG_DELAY);
162 
163         for (i = 0, q = gt->bu2614data; i < 32; i++, q >>= 1) {
164                 bit = (q & 1) ? GEMTEK_DA : 0;
165                 outb_p(mute | GEMTEK_CE | bit, isa->io);
166                 udelay(SHORT_DELAY);
167                 outb_p(mute | GEMTEK_CE | bit | GEMTEK_CK, isa->io);
168                 udelay(SHORT_DELAY);
169         }
170 
171         outb_p(mute | GEMTEK_DA | GEMTEK_CK, isa->io);
172         udelay(SHORT_DELAY);
173 }
174 
175 /*
176  * Calculate divisor from FM-frequency for BU2614FS (3.125 KHz STDF expected).
177  */
178 static unsigned long gemtek_convfreq(unsigned long freq)
179 {
180         return ((freq << FSCALE) + IF_OFFSET + REF_FREQ / 2) / REF_FREQ;
181 }
182 
183 static struct radio_isa_card *gemtek_alloc(void)
184 {
185         struct gemtek *gt = kzalloc(sizeof(*gt), GFP_KERNEL);
186 
187         if (gt)
188                 gt->muted = true;
189         return gt ? &gt->isa : NULL;
190 }
191 
192 /*
193  * Set FM-frequency.
194  */
195 static int gemtek_s_frequency(struct radio_isa_card *isa, u32 freq)
196 {
197         struct gemtek *gt = container_of(isa, struct gemtek, isa);
198 
199         if (hardmute && gt->muted)
200                 return 0;
201 
202         gemtek_bu2614_set(gt, BU2614_PORT, 0);
203         gemtek_bu2614_set(gt, BU2614_FMES, 0);
204         gemtek_bu2614_set(gt, BU2614_SWIN, 0);  /* FM-mode      */
205         gemtek_bu2614_set(gt, BU2614_SWAL, 0);
206         gemtek_bu2614_set(gt, BU2614_FMUN, 1);  /* GT bit set   */
207         gemtek_bu2614_set(gt, BU2614_TEST, 0);
208         gemtek_bu2614_set(gt, BU2614_STDF, GEMTEK_STDF_3_125_KHZ);
209         gemtek_bu2614_set(gt, BU2614_FREQ, gemtek_convfreq(freq));
210         gemtek_bu2614_transmit(gt);
211         return 0;
212 }
213 
214 /*
215  * Set mute flag.
216  */
217 static int gemtek_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
218 {
219         struct gemtek *gt = container_of(isa, struct gemtek, isa);
220         int i;
221 
222         gt->muted = mute;
223         if (hardmute) {
224                 if (!mute)
225                         return gemtek_s_frequency(isa, isa->freq);
226 
227                 /* Turn off PLL, disable data output */
228                 gemtek_bu2614_set(gt, BU2614_PORT, 0);
229                 gemtek_bu2614_set(gt, BU2614_FMES, 0);  /* CT bit off   */
230                 gemtek_bu2614_set(gt, BU2614_SWIN, 0);  /* FM-mode      */
231                 gemtek_bu2614_set(gt, BU2614_SWAL, 0);
232                 gemtek_bu2614_set(gt, BU2614_FMUN, 0);  /* GT bit off   */
233                 gemtek_bu2614_set(gt, BU2614_TEST, 0);
234                 gemtek_bu2614_set(gt, BU2614_STDF, GEMTEK_PLL_OFF);
235                 gemtek_bu2614_set(gt, BU2614_FREQ, 0);
236                 gemtek_bu2614_transmit(gt);
237                 return 0;
238         }
239 
240         /* Read bus contents (CE, CK and DA). */
241         i = inb_p(isa->io);
242         /* Write it back with mute flag set. */
243         outb_p((i >> 5) | (mute ? GEMTEK_MT : 0), isa->io);
244         udelay(SHORT_DELAY);
245         return 0;
246 }
247 
248 static u32 gemtek_g_rxsubchans(struct radio_isa_card *isa)
249 {
250         if (inb_p(isa->io) & GEMTEK_NS)
251                 return V4L2_TUNER_SUB_MONO;
252         return V4L2_TUNER_SUB_STEREO;
253 }
254 
255 /*
256  * Check if requested card acts like GemTek Radio card.
257  */
258 static bool gemtek_probe(struct radio_isa_card *isa, int io)
259 {
260         int i, q;
261 
262         q = inb_p(io);  /* Read bus contents before probing. */
263         /* Try to turn on CE, CK and DA respectively and check if card responds
264            properly. */
265         for (i = 0; i < 3; ++i) {
266                 outb_p(1 << i, io);
267                 udelay(SHORT_DELAY);
268 
269                 if ((inb_p(io) & ~GEMTEK_NS) != (0x17 | (1 << (i + 5))))
270                         return false;
271         }
272         outb_p(q >> 5, io);     /* Write bus contents back. */
273         udelay(SHORT_DELAY);
274         return true;
275 }
276 
277 static const struct radio_isa_ops gemtek_ops = {
278         .alloc = gemtek_alloc,
279         .probe = gemtek_probe,
280         .s_mute_volume = gemtek_s_mute_volume,
281         .s_frequency = gemtek_s_frequency,
282         .g_rxsubchans = gemtek_g_rxsubchans,
283 };
284 
285 static const int gemtek_ioports[] = { 0x20c, 0x30c, 0x24c, 0x34c, 0x248, 0x28c };
286 
287 #ifdef CONFIG_PNP
288 static struct pnp_device_id gemtek_pnp_devices[] = {
289         /* AOpen FX-3D/Pro Radio */
290         {.id = "ADS7183", .driver_data = 0},
291         {.id = ""}
292 };
293 
294 MODULE_DEVICE_TABLE(pnp, gemtek_pnp_devices);
295 #endif
296 
297 static struct radio_isa_driver gemtek_driver = {
298         .driver = {
299                 .match          = radio_isa_match,
300                 .probe          = radio_isa_probe,
301                 .remove         = radio_isa_remove,
302                 .driver         = {
303                         .name   = "radio-gemtek",
304                 },
305         },
306 #ifdef CONFIG_PNP
307         .pnp_driver = {
308                 .name           = "radio-gemtek",
309                 .id_table       = gemtek_pnp_devices,
310                 .probe          = radio_isa_pnp_probe,
311                 .remove         = radio_isa_pnp_remove,
312         },
313 #endif
314         .io_params = io,
315         .radio_nr_params = radio_nr,
316         .io_ports = gemtek_ioports,
317         .num_of_io_ports = ARRAY_SIZE(gemtek_ioports),
318         .region_size = 1,
319         .card = "GemTek Radio",
320         .ops = &gemtek_ops,
321         .has_stereo = true,
322 };
323 
324 static int __init gemtek_init(void)
325 {
326         gemtek_driver.probe = probe;
327 #ifdef CONFIG_PNP
328         pnp_register_driver(&gemtek_driver.pnp_driver);
329 #endif
330         return isa_register_driver(&gemtek_driver.driver, GEMTEK_MAX);
331 }
332 
333 static void __exit gemtek_exit(void)
334 {
335         hardmute = 1;   /* Turn off PLL */
336 #ifdef CONFIG_PNP
337         pnp_unregister_driver(&gemtek_driver.pnp_driver);
338 #endif
339         isa_unregister_driver(&gemtek_driver.driver);
340 }
341 
342 module_init(gemtek_init);
343 module_exit(gemtek_exit);
344 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us