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radio-sf16fmr2.c
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1 /* SF16-FMR2 and SF16-FMD2 radio driver for Linux
2  * Copyright (c) 2011 Ondrej Zary
3  *
4  * Original driver was (c) 2000-2002 Ziglio Frediano, [email protected]
5  * but almost nothing remained here after conversion to generic TEA575x
6  * implementation
7  */
8 
9 #include <linux/delay.h>
10 #include <linux/module.h> /* Modules */
11 #include <linux/init.h> /* Initdata */
12 #include <linux/slab.h>
13 #include <linux/ioport.h> /* request_region */
14 #include <linux/io.h> /* outb, outb_p */
15 #include <linux/isa.h>
16 #include <linux/pnp.h>
17 #include <sound/tea575x-tuner.h>
18 
19 MODULE_AUTHOR("Ondrej Zary");
20 MODULE_DESCRIPTION("MediaForte SF16-FMR2 and SF16-FMD2 FM radio card driver");
21 MODULE_LICENSE("GPL");
22 
23 /* these cards can only use two different ports (0x384 and 0x284) */
24 #define FMR2_MAX 2
25 
26 static int radio_nr[FMR2_MAX] = { [0 ... (FMR2_MAX - 1)] = -1 };
27 module_param_array(radio_nr, int, NULL, 0444);
28 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
29 
30 struct fmr2 {
31  int io;
33  struct snd_tea575x tea;
34  struct v4l2_ctrl *volume;
35  struct v4l2_ctrl *balance;
36  bool is_fmd2;
37 };
38 
39 static int num_fmr2_cards;
40 static struct fmr2 *fmr2_cards[FMR2_MAX];
41 static bool isa_registered;
42 static bool pnp_registered;
43 
44 /* the port is hardwired on SF16-FMR2 */
45 #define FMR2_PORT 0x384
46 
47 /* TEA575x tuner pins */
48 #define STR_DATA (1 << 0)
49 #define STR_CLK (1 << 1)
50 #define STR_WREN (1 << 2)
51 #define STR_MOST (1 << 3)
52 /* PT2254A/TC9154A volume control pins */
53 #define PT_ST (1 << 4)
54 #define PT_CK (1 << 5)
55 #define PT_DATA (1 << 6)
56 /* volume control presence pin */
57 #define FMR2_HASVOL (1 << 7)
58 
59 static void fmr2_tea575x_set_pins(struct snd_tea575x *tea, u8 pins)
60 {
61  struct fmr2 *fmr2 = tea->private_data;
62  u8 bits = 0;
63 
64  bits |= (pins & TEA575X_DATA) ? STR_DATA : 0;
65  bits |= (pins & TEA575X_CLK) ? STR_CLK : 0;
66  /* WRITE_ENABLE is inverted, DATA must be high during read */
67  bits |= (pins & TEA575X_WREN) ? 0 : STR_WREN | STR_DATA;
68 
69  outb(bits, fmr2->io);
70 }
71 
72 static u8 fmr2_tea575x_get_pins(struct snd_tea575x *tea)
73 {
74  struct fmr2 *fmr2 = tea->private_data;
75  u8 bits = inb(fmr2->io);
76 
77  return (bits & STR_DATA) ? TEA575X_DATA : 0 |
78  (bits & STR_MOST) ? TEA575X_MOST : 0;
79 }
80 
81 static void fmr2_tea575x_set_direction(struct snd_tea575x *tea, bool output)
82 {
83 }
84 
85 static struct snd_tea575x_ops fmr2_tea_ops = {
86  .set_pins = fmr2_tea575x_set_pins,
87  .get_pins = fmr2_tea575x_get_pins,
88  .set_direction = fmr2_tea575x_set_direction,
89 };
90 
91 /* TC9154A/PT2254A volume control */
92 
93 /* 18-bit shift register bit definitions */
94 #define TC9154A_ATT_MAJ_0DB (1 << 0)
95 #define TC9154A_ATT_MAJ_10DB (1 << 1)
96 #define TC9154A_ATT_MAJ_20DB (1 << 2)
97 #define TC9154A_ATT_MAJ_30DB (1 << 3)
98 #define TC9154A_ATT_MAJ_40DB (1 << 4)
99 #define TC9154A_ATT_MAJ_50DB (1 << 5)
100 #define TC9154A_ATT_MAJ_60DB (1 << 6)
101 
102 #define TC9154A_ATT_MIN_0DB (1 << 7)
103 #define TC9154A_ATT_MIN_2DB (1 << 8)
104 #define TC9154A_ATT_MIN_4DB (1 << 9)
105 #define TC9154A_ATT_MIN_6DB (1 << 10)
106 #define TC9154A_ATT_MIN_8DB (1 << 11)
107 /* bit 12 is ignored */
108 #define TC9154A_CHANNEL_LEFT (1 << 13)
109 #define TC9154A_CHANNEL_RIGHT (1 << 14)
110 /* bits 15, 16, 17 must be 0 */
111 
112 #define TC9154A_ATT_MAJ(x) (1 << x)
113 #define TC9154A_ATT_MIN(x) (1 << (7 + x))
114 
115 static void tc9154a_set_pins(struct fmr2 *fmr2, u8 pins)
116 {
117  if (!fmr2->tea.mute)
118  pins |= STR_WREN;
119 
120  outb(pins, fmr2->io);
121 }
122 
123 static void tc9154a_set_attenuation(struct fmr2 *fmr2, int att, u32 channel)
124 {
125  int i;
126  u32 reg;
127  u8 bit;
128 
129  reg = TC9154A_ATT_MAJ(att / 10) | TC9154A_ATT_MIN((att % 10) / 2);
130  reg |= channel;
131  /* write 18-bit shift register, LSB first */
132  for (i = 0; i < 18; i++) {
133  bit = reg & (1 << i) ? PT_DATA : 0;
134  tc9154a_set_pins(fmr2, bit);
135  udelay(5);
136  tc9154a_set_pins(fmr2, bit | PT_CK);
137  udelay(5);
138  tc9154a_set_pins(fmr2, bit);
139  }
140 
141  /* latch register data */
142  udelay(5);
143  tc9154a_set_pins(fmr2, PT_ST);
144  udelay(5);
145  tc9154a_set_pins(fmr2, 0);
146 }
147 
148 static int fmr2_s_ctrl(struct v4l2_ctrl *ctrl)
149 {
150  struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
151  struct fmr2 *fmr2 = tea->private_data;
152  int volume, balance, left, right;
153 
154  switch (ctrl->id) {
156  volume = ctrl->val;
157  balance = fmr2->balance->cur.val;
158  break;
160  balance = ctrl->val;
161  volume = fmr2->volume->cur.val;
162  break;
163  default:
164  return -EINVAL;
165  }
166 
167  left = right = volume;
168  if (balance < 0)
169  right = max(0, right + balance);
170  if (balance > 0)
171  left = max(0, left - balance);
172 
173  tc9154a_set_attenuation(fmr2, abs(left - 68), TC9154A_CHANNEL_LEFT);
174  tc9154a_set_attenuation(fmr2, abs(right - 68), TC9154A_CHANNEL_RIGHT);
175 
176  return 0;
177 }
178 
179 static const struct v4l2_ctrl_ops fmr2_ctrl_ops = {
180  .s_ctrl = fmr2_s_ctrl,
181 };
182 
183 static int fmr2_tea_ext_init(struct snd_tea575x *tea)
184 {
185  struct fmr2 *fmr2 = tea->private_data;
186 
187  /* FMR2 can have volume control, FMD2 can't (uses SB16 mixer) */
188  if (!fmr2->is_fmd2 && inb(fmr2->io) & FMR2_HASVOL) {
189  fmr2->volume = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_VOLUME, 0, 68, 2, 56);
190  fmr2->balance = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_BALANCE, -68, 68, 2, 0);
191  if (tea->ctrl_handler.error) {
192  printk(KERN_ERR "radio-sf16fmr2: can't initialize controls\n");
193  return tea->ctrl_handler.error;
194  }
195  }
196 
197  return 0;
198 }
199 
200 static struct pnp_device_id fmr2_pnp_ids[] __devinitdata = {
201  { .id = "MFRad13" }, /* tuner subdevice of SF16-FMD2 */
202  { .id = "" }
203 };
204 MODULE_DEVICE_TABLE(pnp, fmr2_pnp_ids);
205 
206 static int __devinit fmr2_probe(struct fmr2 *fmr2, struct device *pdev, int io)
207 {
208  int err, i;
209  char *card_name = fmr2->is_fmd2 ? "SF16-FMD2" : "SF16-FMR2";
210 
211  /* avoid errors if a card was already registered at given port */
212  for (i = 0; i < num_fmr2_cards; i++)
213  if (io == fmr2_cards[i]->io)
214  return -EBUSY;
215 
216  strlcpy(fmr2->v4l2_dev.name, "radio-sf16fmr2",
217  sizeof(fmr2->v4l2_dev.name)),
218  fmr2->io = io;
219 
220  if (!request_region(fmr2->io, 2, fmr2->v4l2_dev.name)) {
221  printk(KERN_ERR "radio-sf16fmr2: I/O port 0x%x already in use\n", fmr2->io);
222  return -EBUSY;
223  }
224 
225  dev_set_drvdata(pdev, fmr2);
226  err = v4l2_device_register(pdev, &fmr2->v4l2_dev);
227  if (err < 0) {
228  v4l2_err(&fmr2->v4l2_dev, "Could not register v4l2_device\n");
229  release_region(fmr2->io, 2);
230  return err;
231  }
232  fmr2->tea.v4l2_dev = &fmr2->v4l2_dev;
233  fmr2->tea.private_data = fmr2;
234  fmr2->tea.radio_nr = radio_nr[num_fmr2_cards];
235  fmr2->tea.ops = &fmr2_tea_ops;
236  fmr2->tea.ext_init = fmr2_tea_ext_init;
237  strlcpy(fmr2->tea.card, card_name, sizeof(fmr2->tea.card));
238  snprintf(fmr2->tea.bus_info, sizeof(fmr2->tea.bus_info), "%s:%s",
239  fmr2->is_fmd2 ? "PnP" : "ISA", dev_name(pdev));
240 
241  if (snd_tea575x_init(&fmr2->tea, THIS_MODULE)) {
242  printk(KERN_ERR "radio-sf16fmr2: Unable to detect TEA575x tuner\n");
243  release_region(fmr2->io, 2);
244  return -ENODEV;
245  }
246 
247  printk(KERN_INFO "radio-sf16fmr2: %s radio card at 0x%x.\n",
248  card_name, fmr2->io);
249  return 0;
250 }
251 
252 static int __devinit fmr2_isa_match(struct device *pdev, unsigned int ndev)
253 {
254  struct fmr2 *fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
255  if (!fmr2)
256  return 0;
257 
258  if (fmr2_probe(fmr2, pdev, FMR2_PORT)) {
259  kfree(fmr2);
260  return 0;
261  }
262  dev_set_drvdata(pdev, fmr2);
263  fmr2_cards[num_fmr2_cards++] = fmr2;
264 
265  return 1;
266 }
267 
268 static int __devinit fmr2_pnp_probe(struct pnp_dev *pdev,
269  const struct pnp_device_id *id)
270 {
271  int ret;
272  struct fmr2 *fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
273  if (!fmr2)
274  return -ENOMEM;
275 
276  fmr2->is_fmd2 = true;
277  ret = fmr2_probe(fmr2, &pdev->dev, pnp_port_start(pdev, 0));
278  if (ret) {
279  kfree(fmr2);
280  return ret;
281  }
282  pnp_set_drvdata(pdev, fmr2);
283  fmr2_cards[num_fmr2_cards++] = fmr2;
284 
285  return 0;
286 }
287 
288 static void __devexit fmr2_remove(struct fmr2 *fmr2)
289 {
290  snd_tea575x_exit(&fmr2->tea);
291  release_region(fmr2->io, 2);
293  kfree(fmr2);
294 }
295 
296 static int __devexit fmr2_isa_remove(struct device *pdev, unsigned int ndev)
297 {
298  fmr2_remove(dev_get_drvdata(pdev));
299  dev_set_drvdata(pdev, NULL);
300 
301  return 0;
302 }
303 
304 static void __devexit fmr2_pnp_remove(struct pnp_dev *pdev)
305 {
306  fmr2_remove(pnp_get_drvdata(pdev));
307  pnp_set_drvdata(pdev, NULL);
308 }
309 
311  .match = fmr2_isa_match,
312  .remove = __devexit_p(fmr2_isa_remove),
313  .driver = {
314  .name = "radio-sf16fmr2",
315  },
316 };
317 
319  .name = "radio-sf16fmr2",
320  .id_table = fmr2_pnp_ids,
321  .probe = fmr2_pnp_probe,
322  .remove = __devexit_p(fmr2_pnp_remove),
323 };
324 
325 static int __init fmr2_init(void)
326 {
327  int ret;
328 
329  ret = pnp_register_driver(&fmr2_pnp_driver);
330  if (!ret)
331  pnp_registered = true;
332  ret = isa_register_driver(&fmr2_isa_driver, 1);
333  if (!ret)
334  isa_registered = true;
335 
336  return (pnp_registered || isa_registered) ? 0 : ret;
337 }
338 
339 static void __exit fmr2_exit(void)
340 {
341  if (pnp_registered)
342  pnp_unregister_driver(&fmr2_pnp_driver);
343  if (isa_registered)
344  isa_unregister_driver(&fmr2_isa_driver);
345 }
346 
347 module_init(fmr2_init);
348 module_exit(fmr2_exit);