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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, freddy77@angelfire.com
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 <media/tea575x.h>
18
19MODULE_AUTHOR("Ondrej Zary");
20MODULE_DESCRIPTION("MediaForte SF16-FMR2 and SF16-FMD2 FM radio card driver");
21MODULE_LICENSE("GPL");
22
23/* these cards can only use two different ports (0x384 and 0x284) */
24#define FMR2_MAX 2
25
26static int radio_nr[FMR2_MAX] = { [0 ... (FMR2_MAX - 1)] = -1 };
27module_param_array(radio_nr, int, NULL, 0444);
28MODULE_PARM_DESC(radio_nr, "Radio device numbers");
29
30struct fmr2 {
31	int io;
32	struct v4l2_device v4l2_dev;
33	struct snd_tea575x tea;
34	struct v4l2_ctrl *volume;
35	struct v4l2_ctrl *balance;
36	bool is_fmd2;
37};
38
39static int num_fmr2_cards;
40static struct fmr2 *fmr2_cards[FMR2_MAX];
41static bool isa_registered;
42static 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
59static 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
72static 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
81static void fmr2_tea575x_set_direction(struct snd_tea575x *tea, bool output)
82{
83}
84
85static 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
115static 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
123static 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
148static 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) {
155	case V4L2_CID_AUDIO_VOLUME:
156		volume = ctrl->val;
157		balance = fmr2->balance->cur.val;
158		break;
159	case V4L2_CID_AUDIO_BALANCE:
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
179static const struct v4l2_ctrl_ops fmr2_ctrl_ops = {
180	.s_ctrl = fmr2_s_ctrl,
181};
182
183static 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
200static struct pnp_device_id fmr2_pnp_ids[] = {
201	{ .id = "MFRad13" }, /* tuner subdevice of SF16-FMD2 */
202	{ .id = "" }
203};
204MODULE_DEVICE_TABLE(pnp, fmr2_pnp_ids);
205
206static int 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
252static int 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
268static int fmr2_pnp_probe(struct pnp_dev *pdev, const struct pnp_device_id *id)
269{
270	int ret;
271	struct fmr2 *fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
272	if (!fmr2)
273		return -ENOMEM;
274
275	fmr2->is_fmd2 = true;
276	ret = fmr2_probe(fmr2, &pdev->dev, pnp_port_start(pdev, 0));
277	if (ret) {
278		kfree(fmr2);
279		return ret;
280	}
281	pnp_set_drvdata(pdev, fmr2);
282	fmr2_cards[num_fmr2_cards++] = fmr2;
283
284	return 0;
285}
286
287static void fmr2_remove(struct fmr2 *fmr2)
288{
289	snd_tea575x_exit(&fmr2->tea);
290	release_region(fmr2->io, 2);
291	v4l2_device_unregister(&fmr2->v4l2_dev);
292	kfree(fmr2);
293}
294
295static int fmr2_isa_remove(struct device *pdev, unsigned int ndev)
296{
297	fmr2_remove(dev_get_drvdata(pdev));
298
299	return 0;
300}
301
302static void fmr2_pnp_remove(struct pnp_dev *pdev)
303{
304	fmr2_remove(pnp_get_drvdata(pdev));
305	pnp_set_drvdata(pdev, NULL);
306}
307
308static struct isa_driver fmr2_isa_driver = {
309	.match		= fmr2_isa_match,
310	.remove		= fmr2_isa_remove,
311	.driver		= {
312		.name	= "radio-sf16fmr2",
313	},
314};
315
316static struct pnp_driver fmr2_pnp_driver = {
317	.name		= "radio-sf16fmr2",
318	.id_table	= fmr2_pnp_ids,
319	.probe		= fmr2_pnp_probe,
320	.remove		= fmr2_pnp_remove,
321};
322
323static int __init fmr2_init(void)
324{
325	int ret;
326
327	ret = pnp_register_driver(&fmr2_pnp_driver);
328	if (!ret)
329		pnp_registered = true;
330	ret = isa_register_driver(&fmr2_isa_driver, 1);
331	if (!ret)
332		isa_registered = true;
333
334	return (pnp_registered || isa_registered) ? 0 : ret;
335}
336
337static void __exit fmr2_exit(void)
338{
339	if (pnp_registered)
340		pnp_unregister_driver(&fmr2_pnp_driver);
341	if (isa_registered)
342		isa_unregister_driver(&fmr2_isa_driver);
343}
344
345module_init(fmr2_init);
346module_exit(fmr2_exit);
347