1 // SPDX-License-Identifier: GPL-2.0-only
2 /* SF16-FMR2 and SF16-FMD2 radio driver for Linux
3 * Copyright (c) 2011 Ondrej Zary
4 *
5 * Original driver was (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
6 * but almost nothing remained here after conversion to generic TEA575x
7 * implementation
8 */
9
10 #include <linux/delay.h>
11 #include <linux/module.h> /* Modules */
12 #include <linux/init.h> /* Initdata */
13 #include <linux/slab.h>
14 #include <linux/ioport.h> /* request_region */
15 #include <linux/io.h> /* outb, outb_p */
16 #include <linux/isa.h>
17 #include <linux/pnp.h>
18 #include <media/drv-intf/tea575x.h>
19
20 MODULE_AUTHOR("Ondrej Zary");
21 MODULE_DESCRIPTION("MediaForte SF16-FMR2 and SF16-FMD2 FM radio card driver");
22 MODULE_LICENSE("GPL");
23
24 /* these cards can only use two different ports (0x384 and 0x284) */
25 #define FMR2_MAX 2
26
27 static int radio_nr[FMR2_MAX] = { [0 ... (FMR2_MAX - 1)] = -1 };
28 module_param_array(radio_nr, int, NULL, 0444);
29 MODULE_PARM_DESC(radio_nr, "Radio device numbers");
30
31 struct fmr2 {
32 int io;
33 struct v4l2_device v4l2_dev;
34 struct snd_tea575x tea;
35 struct v4l2_ctrl *volume;
36 struct v4l2_ctrl *balance;
37 bool is_fmd2;
38 };
39
40 static int num_fmr2_cards;
41 static struct fmr2 *fmr2_cards[FMR2_MAX];
42 static bool isa_registered;
43 static bool pnp_registered;
44
45 /* the port is hardwired on SF16-FMR2 */
46 #define FMR2_PORT 0x384
47
48 /* TEA575x tuner pins */
49 #define STR_DATA (1 << 0)
50 #define STR_CLK (1 << 1)
51 #define STR_WREN (1 << 2)
52 #define STR_MOST (1 << 3)
53 /* PT2254A/TC9154A volume control pins */
54 #define PT_ST (1 << 4)
55 #define PT_CK (1 << 5)
56 #define PT_DATA (1 << 6)
57 /* volume control presence pin */
58 #define FMR2_HASVOL (1 << 7)
59
fmr2_tea575x_set_pins(struct snd_tea575x * tea,u8 pins)60 static void fmr2_tea575x_set_pins(struct snd_tea575x *tea, u8 pins)
61 {
62 struct fmr2 *fmr2 = tea->private_data;
63 u8 bits = 0;
64
65 bits |= (pins & TEA575X_DATA) ? STR_DATA : 0;
66 bits |= (pins & TEA575X_CLK) ? STR_CLK : 0;
67 /* WRITE_ENABLE is inverted, DATA must be high during read */
68 bits |= (pins & TEA575X_WREN) ? 0 : STR_WREN | STR_DATA;
69
70 outb(bits, fmr2->io);
71 }
72
fmr2_tea575x_get_pins(struct snd_tea575x * tea)73 static u8 fmr2_tea575x_get_pins(struct snd_tea575x *tea)
74 {
75 struct fmr2 *fmr2 = tea->private_data;
76 u8 bits = inb(fmr2->io);
77
78 return ((bits & STR_DATA) ? TEA575X_DATA : 0) |
79 ((bits & STR_MOST) ? TEA575X_MOST : 0);
80 }
81
fmr2_tea575x_set_direction(struct snd_tea575x * tea,bool output)82 static void fmr2_tea575x_set_direction(struct snd_tea575x *tea, bool output)
83 {
84 }
85
86 static const struct snd_tea575x_ops fmr2_tea_ops = {
87 .set_pins = fmr2_tea575x_set_pins,
88 .get_pins = fmr2_tea575x_get_pins,
89 .set_direction = fmr2_tea575x_set_direction,
90 };
91
92 /* TC9154A/PT2254A volume control */
93
94 /* 18-bit shift register bit definitions */
95 #define TC9154A_ATT_MAJ_0DB (1 << 0)
96 #define TC9154A_ATT_MAJ_10DB (1 << 1)
97 #define TC9154A_ATT_MAJ_20DB (1 << 2)
98 #define TC9154A_ATT_MAJ_30DB (1 << 3)
99 #define TC9154A_ATT_MAJ_40DB (1 << 4)
100 #define TC9154A_ATT_MAJ_50DB (1 << 5)
101 #define TC9154A_ATT_MAJ_60DB (1 << 6)
102
103 #define TC9154A_ATT_MIN_0DB (1 << 7)
104 #define TC9154A_ATT_MIN_2DB (1 << 8)
105 #define TC9154A_ATT_MIN_4DB (1 << 9)
106 #define TC9154A_ATT_MIN_6DB (1 << 10)
107 #define TC9154A_ATT_MIN_8DB (1 << 11)
108 /* bit 12 is ignored */
109 #define TC9154A_CHANNEL_LEFT (1 << 13)
110 #define TC9154A_CHANNEL_RIGHT (1 << 14)
111 /* bits 15, 16, 17 must be 0 */
112
113 #define TC9154A_ATT_MAJ(x) (1 << x)
114 #define TC9154A_ATT_MIN(x) (1 << (7 + x))
115
tc9154a_set_pins(struct fmr2 * fmr2,u8 pins)116 static void tc9154a_set_pins(struct fmr2 *fmr2, u8 pins)
117 {
118 if (!fmr2->tea.mute)
119 pins |= STR_WREN;
120
121 outb(pins, fmr2->io);
122 }
123
tc9154a_set_attenuation(struct fmr2 * fmr2,int att,u32 channel)124 static void tc9154a_set_attenuation(struct fmr2 *fmr2, int att, u32 channel)
125 {
126 int i;
127 u32 reg;
128 u8 bit;
129
130 reg = TC9154A_ATT_MAJ(att / 10) | TC9154A_ATT_MIN((att % 10) / 2);
131 reg |= channel;
132 /* write 18-bit shift register, LSB first */
133 for (i = 0; i < 18; i++) {
134 bit = reg & (1 << i) ? PT_DATA : 0;
135 tc9154a_set_pins(fmr2, bit);
136 udelay(5);
137 tc9154a_set_pins(fmr2, bit | PT_CK);
138 udelay(5);
139 tc9154a_set_pins(fmr2, bit);
140 }
141
142 /* latch register data */
143 udelay(5);
144 tc9154a_set_pins(fmr2, PT_ST);
145 udelay(5);
146 tc9154a_set_pins(fmr2, 0);
147 }
148
fmr2_s_ctrl(struct v4l2_ctrl * ctrl)149 static int fmr2_s_ctrl(struct v4l2_ctrl *ctrl)
150 {
151 struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
152 struct fmr2 *fmr2 = tea->private_data;
153 int volume, balance, left, right;
154
155 switch (ctrl->id) {
156 case V4L2_CID_AUDIO_VOLUME:
157 volume = ctrl->val;
158 balance = fmr2->balance->cur.val;
159 break;
160 case V4L2_CID_AUDIO_BALANCE:
161 balance = ctrl->val;
162 volume = fmr2->volume->cur.val;
163 break;
164 default:
165 return -EINVAL;
166 }
167
168 left = right = volume;
169 if (balance < 0)
170 right = max(0, right + balance);
171 if (balance > 0)
172 left = max(0, left - balance);
173
174 tc9154a_set_attenuation(fmr2, abs(left - 68), TC9154A_CHANNEL_LEFT);
175 tc9154a_set_attenuation(fmr2, abs(right - 68), TC9154A_CHANNEL_RIGHT);
176
177 return 0;
178 }
179
180 static const struct v4l2_ctrl_ops fmr2_ctrl_ops = {
181 .s_ctrl = fmr2_s_ctrl,
182 };
183
fmr2_tea_ext_init(struct snd_tea575x * tea)184 static int fmr2_tea_ext_init(struct snd_tea575x *tea)
185 {
186 struct fmr2 *fmr2 = tea->private_data;
187
188 /* FMR2 can have volume control, FMD2 can't (uses SB16 mixer) */
189 if (!fmr2->is_fmd2 && inb(fmr2->io) & FMR2_HASVOL) {
190 fmr2->volume = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_VOLUME, 0, 68, 2, 56);
191 fmr2->balance = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_BALANCE, -68, 68, 2, 0);
192 if (tea->ctrl_handler.error) {
193 printk(KERN_ERR "radio-sf16fmr2: can't initialize controls\n");
194 return tea->ctrl_handler.error;
195 }
196 }
197
198 return 0;
199 }
200
201 static const struct pnp_device_id fmr2_pnp_ids[] = {
202 { .id = "MFRad13" }, /* tuner subdevice of SF16-FMD2 */
203 { .id = "" }
204 };
205 MODULE_DEVICE_TABLE(pnp, fmr2_pnp_ids);
206
fmr2_probe(struct fmr2 * fmr2,struct device * pdev,int io)207 static int fmr2_probe(struct fmr2 *fmr2, struct device *pdev, int io)
208 {
209 int err, i;
210 char *card_name = fmr2->is_fmd2 ? "SF16-FMD2" : "SF16-FMR2";
211
212 /* avoid errors if a card was already registered at given port */
213 for (i = 0; i < num_fmr2_cards; i++)
214 if (io == fmr2_cards[i]->io)
215 return -EBUSY;
216
217 strscpy(fmr2->v4l2_dev.name, "radio-sf16fmr2",
218 sizeof(fmr2->v4l2_dev.name));
219 fmr2->io = io;
220
221 if (!request_region(fmr2->io, 2, fmr2->v4l2_dev.name)) {
222 printk(KERN_ERR "radio-sf16fmr2: I/O port 0x%x already in use\n", fmr2->io);
223 return -EBUSY;
224 }
225
226 dev_set_drvdata(pdev, fmr2);
227 err = v4l2_device_register(pdev, &fmr2->v4l2_dev);
228 if (err < 0) {
229 v4l2_err(&fmr2->v4l2_dev, "Could not register v4l2_device\n");
230 release_region(fmr2->io, 2);
231 return err;
232 }
233 fmr2->tea.v4l2_dev = &fmr2->v4l2_dev;
234 fmr2->tea.private_data = fmr2;
235 fmr2->tea.radio_nr = radio_nr[num_fmr2_cards];
236 fmr2->tea.ops = &fmr2_tea_ops;
237 fmr2->tea.ext_init = fmr2_tea_ext_init;
238 strscpy(fmr2->tea.card, card_name, sizeof(fmr2->tea.card));
239 snprintf(fmr2->tea.bus_info, sizeof(fmr2->tea.bus_info), "%s:%s",
240 fmr2->is_fmd2 ? "PnP" : "ISA", dev_name(pdev));
241
242 if (snd_tea575x_init(&fmr2->tea, THIS_MODULE)) {
243 printk(KERN_ERR "radio-sf16fmr2: Unable to detect TEA575x tuner\n");
244 release_region(fmr2->io, 2);
245 return -ENODEV;
246 }
247
248 printk(KERN_INFO "radio-sf16fmr2: %s radio card at 0x%x.\n",
249 card_name, fmr2->io);
250 return 0;
251 }
252
fmr2_isa_match(struct device * pdev,unsigned int ndev)253 static int fmr2_isa_match(struct device *pdev, unsigned int ndev)
254 {
255 struct fmr2 *fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
256 if (!fmr2)
257 return 0;
258
259 if (fmr2_probe(fmr2, pdev, FMR2_PORT)) {
260 kfree(fmr2);
261 return 0;
262 }
263 dev_set_drvdata(pdev, fmr2);
264 fmr2_cards[num_fmr2_cards++] = fmr2;
265
266 return 1;
267 }
268
fmr2_pnp_probe(struct pnp_dev * pdev,const struct pnp_device_id * id)269 static int fmr2_pnp_probe(struct pnp_dev *pdev, 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
fmr2_remove(struct fmr2 * fmr2)288 static void fmr2_remove(struct fmr2 *fmr2)
289 {
290 snd_tea575x_exit(&fmr2->tea);
291 release_region(fmr2->io, 2);
292 v4l2_device_unregister(&fmr2->v4l2_dev);
293 kfree(fmr2);
294 }
295
fmr2_isa_remove(struct device * pdev,unsigned int ndev)296 static void fmr2_isa_remove(struct device *pdev, unsigned int ndev)
297 {
298 fmr2_remove(dev_get_drvdata(pdev));
299 }
300
fmr2_pnp_remove(struct pnp_dev * pdev)301 static void fmr2_pnp_remove(struct pnp_dev *pdev)
302 {
303 fmr2_remove(pnp_get_drvdata(pdev));
304 pnp_set_drvdata(pdev, NULL);
305 }
306
307 static struct isa_driver fmr2_isa_driver = {
308 .match = fmr2_isa_match,
309 .remove = fmr2_isa_remove,
310 .driver = {
311 .name = "radio-sf16fmr2",
312 },
313 };
314
315 static struct pnp_driver fmr2_pnp_driver = {
316 .name = "radio-sf16fmr2",
317 .id_table = fmr2_pnp_ids,
318 .probe = fmr2_pnp_probe,
319 .remove = fmr2_pnp_remove,
320 };
321
fmr2_init(void)322 static int __init fmr2_init(void)
323 {
324 int ret;
325
326 ret = pnp_register_driver(&fmr2_pnp_driver);
327 if (!ret)
328 pnp_registered = true;
329 ret = isa_register_driver(&fmr2_isa_driver, 1);
330 if (!ret)
331 isa_registered = true;
332
333 return (pnp_registered || isa_registered) ? 0 : ret;
334 }
335
fmr2_exit(void)336 static void __exit fmr2_exit(void)
337 {
338 if (pnp_registered)
339 pnp_unregister_driver(&fmr2_pnp_driver);
340 if (isa_registered)
341 isa_unregister_driver(&fmr2_isa_driver);
342 }
343
344 module_init(fmr2_init);
345 module_exit(fmr2_exit);
346