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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
296 static int fmr2_isa_remove(struct device *pdev, unsigned int ndev)
297 {
298 	fmr2_remove(dev_get_drvdata(pdev));
299 
300 	return 0;
301 }
302 
303 static void fmr2_pnp_remove(struct pnp_dev *pdev)
304 {
305 	fmr2_remove(pnp_get_drvdata(pdev));
306 	pnp_set_drvdata(pdev, NULL);
307 }
308 
309 static struct isa_driver fmr2_isa_driver = {
310 	.match		= fmr2_isa_match,
311 	.remove		= fmr2_isa_remove,
312 	.driver		= {
313 		.name	= "radio-sf16fmr2",
314 	},
315 };
316 
317 static struct pnp_driver fmr2_pnp_driver = {
318 	.name		= "radio-sf16fmr2",
319 	.id_table	= fmr2_pnp_ids,
320 	.probe		= fmr2_pnp_probe,
321 	.remove		= fmr2_pnp_remove,
322 };
323 
324 static int __init fmr2_init(void)
325 {
326 	int ret;
327 
328 	ret = pnp_register_driver(&fmr2_pnp_driver);
329 	if (!ret)
330 		pnp_registered = true;
331 	ret = isa_register_driver(&fmr2_isa_driver, 1);
332 	if (!ret)
333 		isa_registered = true;
334 
335 	return (pnp_registered || isa_registered) ? 0 : ret;
336 }
337 
338 static void __exit fmr2_exit(void)
339 {
340 	if (pnp_registered)
341 		pnp_unregister_driver(&fmr2_pnp_driver);
342 	if (isa_registered)
343 		isa_unregister_driver(&fmr2_isa_driver);
344 }
345 
346 module_init(fmr2_init);
347 module_exit(fmr2_exit);
348