1 /* SF16-FMR2 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 <sound/tea575x-tuner.h>
17
18 MODULE_AUTHOR("Ondrej Zary");
19 MODULE_DESCRIPTION("MediaForte SF16-FMR2 FM radio card driver");
20 MODULE_LICENSE("GPL");
21
22 static int radio_nr = -1;
23 module_param(radio_nr, int, 0444);
24 MODULE_PARM_DESC(radio_nr, "Radio device number");
25
26 struct fmr2 {
27 int io;
28 struct v4l2_device v4l2_dev;
29 struct snd_tea575x tea;
30 struct v4l2_ctrl *volume;
31 struct v4l2_ctrl *balance;
32 };
33
34 /* the port is hardwired so no need to support multiple cards */
35 #define FMR2_PORT 0x384
36
37 /* TEA575x tuner pins */
38 #define STR_DATA (1 << 0)
39 #define STR_CLK (1 << 1)
40 #define STR_WREN (1 << 2)
41 #define STR_MOST (1 << 3)
42 /* PT2254A/TC9154A volume control pins */
43 #define PT_ST (1 << 4)
44 #define PT_CK (1 << 5)
45 #define PT_DATA (1 << 6)
46 /* volume control presence pin */
47 #define FMR2_HASVOL (1 << 7)
48
fmr2_tea575x_set_pins(struct snd_tea575x * tea,u8 pins)49 static void fmr2_tea575x_set_pins(struct snd_tea575x *tea, u8 pins)
50 {
51 struct fmr2 *fmr2 = tea->private_data;
52 u8 bits = 0;
53
54 bits |= (pins & TEA575X_DATA) ? STR_DATA : 0;
55 bits |= (pins & TEA575X_CLK) ? STR_CLK : 0;
56 /* WRITE_ENABLE is inverted, DATA must be high during read */
57 bits |= (pins & TEA575X_WREN) ? 0 : STR_WREN | STR_DATA;
58
59 outb(bits, fmr2->io);
60 }
61
fmr2_tea575x_get_pins(struct snd_tea575x * tea)62 static u8 fmr2_tea575x_get_pins(struct snd_tea575x *tea)
63 {
64 struct fmr2 *fmr2 = tea->private_data;
65 u8 bits = inb(fmr2->io);
66
67 return (bits & STR_DATA) ? TEA575X_DATA : 0 |
68 (bits & STR_MOST) ? TEA575X_MOST : 0;
69 }
70
fmr2_tea575x_set_direction(struct snd_tea575x * tea,bool output)71 static void fmr2_tea575x_set_direction(struct snd_tea575x *tea, bool output)
72 {
73 }
74
75 static struct snd_tea575x_ops fmr2_tea_ops = {
76 .set_pins = fmr2_tea575x_set_pins,
77 .get_pins = fmr2_tea575x_get_pins,
78 .set_direction = fmr2_tea575x_set_direction,
79 };
80
81 /* TC9154A/PT2254A volume control */
82
83 /* 18-bit shift register bit definitions */
84 #define TC9154A_ATT_MAJ_0DB (1 << 0)
85 #define TC9154A_ATT_MAJ_10DB (1 << 1)
86 #define TC9154A_ATT_MAJ_20DB (1 << 2)
87 #define TC9154A_ATT_MAJ_30DB (1 << 3)
88 #define TC9154A_ATT_MAJ_40DB (1 << 4)
89 #define TC9154A_ATT_MAJ_50DB (1 << 5)
90 #define TC9154A_ATT_MAJ_60DB (1 << 6)
91
92 #define TC9154A_ATT_MIN_0DB (1 << 7)
93 #define TC9154A_ATT_MIN_2DB (1 << 8)
94 #define TC9154A_ATT_MIN_4DB (1 << 9)
95 #define TC9154A_ATT_MIN_6DB (1 << 10)
96 #define TC9154A_ATT_MIN_8DB (1 << 11)
97 /* bit 12 is ignored */
98 #define TC9154A_CHANNEL_LEFT (1 << 13)
99 #define TC9154A_CHANNEL_RIGHT (1 << 14)
100 /* bits 15, 16, 17 must be 0 */
101
102 #define TC9154A_ATT_MAJ(x) (1 << x)
103 #define TC9154A_ATT_MIN(x) (1 << (7 + x))
104
tc9154a_set_pins(struct fmr2 * fmr2,u8 pins)105 static void tc9154a_set_pins(struct fmr2 *fmr2, u8 pins)
106 {
107 if (!fmr2->tea.mute)
108 pins |= STR_WREN;
109
110 outb(pins, fmr2->io);
111 }
112
tc9154a_set_attenuation(struct fmr2 * fmr2,int att,u32 channel)113 static void tc9154a_set_attenuation(struct fmr2 *fmr2, int att, u32 channel)
114 {
115 int i;
116 u32 reg;
117 u8 bit;
118
119 reg = TC9154A_ATT_MAJ(att / 10) | TC9154A_ATT_MIN((att % 10) / 2);
120 reg |= channel;
121 /* write 18-bit shift register, LSB first */
122 for (i = 0; i < 18; i++) {
123 bit = reg & (1 << i) ? PT_DATA : 0;
124 tc9154a_set_pins(fmr2, bit);
125 udelay(5);
126 tc9154a_set_pins(fmr2, bit | PT_CK);
127 udelay(5);
128 tc9154a_set_pins(fmr2, bit);
129 }
130
131 /* latch register data */
132 udelay(5);
133 tc9154a_set_pins(fmr2, PT_ST);
134 udelay(5);
135 tc9154a_set_pins(fmr2, 0);
136 }
137
fmr2_s_ctrl(struct v4l2_ctrl * ctrl)138 static int fmr2_s_ctrl(struct v4l2_ctrl *ctrl)
139 {
140 struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
141 struct fmr2 *fmr2 = tea->private_data;
142 int volume, balance, left, right;
143
144 switch (ctrl->id) {
145 case V4L2_CID_AUDIO_VOLUME:
146 volume = ctrl->val;
147 balance = fmr2->balance->cur.val;
148 break;
149 case V4L2_CID_AUDIO_BALANCE:
150 balance = ctrl->val;
151 volume = fmr2->volume->cur.val;
152 break;
153 default:
154 return -EINVAL;
155 }
156
157 left = right = volume;
158 if (balance < 0)
159 right = max(0, right + balance);
160 if (balance > 0)
161 left = max(0, left - balance);
162
163 tc9154a_set_attenuation(fmr2, abs(left - 68), TC9154A_CHANNEL_LEFT);
164 tc9154a_set_attenuation(fmr2, abs(right - 68), TC9154A_CHANNEL_RIGHT);
165
166 return 0;
167 }
168
169 static const struct v4l2_ctrl_ops fmr2_ctrl_ops = {
170 .s_ctrl = fmr2_s_ctrl,
171 };
172
fmr2_tea_ext_init(struct snd_tea575x * tea)173 static int fmr2_tea_ext_init(struct snd_tea575x *tea)
174 {
175 struct fmr2 *fmr2 = tea->private_data;
176
177 if (inb(fmr2->io) & FMR2_HASVOL) {
178 fmr2->volume = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_VOLUME, 0, 68, 2, 56);
179 fmr2->balance = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_BALANCE, -68, 68, 2, 0);
180 if (tea->ctrl_handler.error) {
181 printk(KERN_ERR "radio-sf16fmr2: can't initialize controls\n");
182 return tea->ctrl_handler.error;
183 }
184 }
185
186 return 0;
187 }
188
fmr2_probe(struct device * pdev,unsigned int dev)189 static int __devinit fmr2_probe(struct device *pdev, unsigned int dev)
190 {
191 struct fmr2 *fmr2;
192 int err;
193
194 fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
195 if (fmr2 == NULL)
196 return -ENOMEM;
197
198 strlcpy(fmr2->v4l2_dev.name, dev_name(pdev),
199 sizeof(fmr2->v4l2_dev.name));
200 fmr2->io = FMR2_PORT;
201
202 if (!request_region(fmr2->io, 2, fmr2->v4l2_dev.name)) {
203 printk(KERN_ERR "radio-sf16fmr2: I/O port 0x%x already in use\n", fmr2->io);
204 kfree(fmr2);
205 return -EBUSY;
206 }
207
208 dev_set_drvdata(pdev, fmr2);
209 err = v4l2_device_register(pdev, &fmr2->v4l2_dev);
210 if (err < 0) {
211 v4l2_err(&fmr2->v4l2_dev, "Could not register v4l2_device\n");
212 release_region(fmr2->io, 2);
213 kfree(fmr2);
214 return err;
215 }
216 fmr2->tea.v4l2_dev = &fmr2->v4l2_dev;
217 fmr2->tea.private_data = fmr2;
218 fmr2->tea.radio_nr = radio_nr;
219 fmr2->tea.ops = &fmr2_tea_ops;
220 fmr2->tea.ext_init = fmr2_tea_ext_init;
221 strlcpy(fmr2->tea.card, "SF16-FMR2", sizeof(fmr2->tea.card));
222 snprintf(fmr2->tea.bus_info, sizeof(fmr2->tea.bus_info), "ISA:%s",
223 fmr2->v4l2_dev.name);
224
225 if (snd_tea575x_init(&fmr2->tea)) {
226 printk(KERN_ERR "radio-sf16fmr2: Unable to detect TEA575x tuner\n");
227 release_region(fmr2->io, 2);
228 kfree(fmr2);
229 return -ENODEV;
230 }
231
232 printk(KERN_INFO "radio-sf16fmr2: SF16-FMR2 radio card at 0x%x.\n", fmr2->io);
233 return 0;
234 }
235
fmr2_remove(struct device * pdev,unsigned int dev)236 static int __exit fmr2_remove(struct device *pdev, unsigned int dev)
237 {
238 struct fmr2 *fmr2 = dev_get_drvdata(pdev);
239
240 snd_tea575x_exit(&fmr2->tea);
241 release_region(fmr2->io, 2);
242 v4l2_device_unregister(&fmr2->v4l2_dev);
243 kfree(fmr2);
244 return 0;
245 }
246
247 struct isa_driver fmr2_driver = {
248 .probe = fmr2_probe,
249 .remove = fmr2_remove,
250 .driver = {
251 .name = "radio-sf16fmr2",
252 },
253 };
254
fmr2_init(void)255 static int __init fmr2_init(void)
256 {
257 return isa_register_driver(&fmr2_driver, 1);
258 }
259
fmr2_exit(void)260 static void __exit fmr2_exit(void)
261 {
262 isa_unregister_driver(&fmr2_driver);
263 }
264
265 module_init(fmr2_init);
266 module_exit(fmr2_exit);
267