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1da177e4 LT |
1 | /* Maestro PCI sound card radio driver for Linux support |
2 | * (c) 2000 A. Tlalka, atlka@pg.gda.pl | |
3 | * Notes on the hardware | |
4 | * | |
5 | * + Frequency control is done digitally | |
6 | * + No volume control - only mute/unmute - you have to use Aux line volume | |
7 | * control on Maestro card to set the volume | |
8 | * + Radio status (tuned/not_tuned and stereo/mono) is valid some time after | |
9 | * frequency setting (>100ms) and only when the radio is unmuted. | |
10 | * version 0.02 | |
11 | * + io port is automatically detected - only the first radio is used | |
12 | * version 0.03 | |
13 | * + thread access locking additions | |
14 | * version 0.04 | |
15 | * + code improvements | |
16 | * + VIDEO_TUNER_LOW is permanent | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/ioport.h> | |
22 | #include <linux/delay.h> | |
23 | #include <linux/sched.h> | |
24 | #include <asm/io.h> | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/semaphore.h> | |
27 | #include <linux/pci.h> | |
28 | #include <linux/videodev.h> | |
29 | ||
30 | #define DRIVER_VERSION "0.04" | |
31 | ||
32 | #define PCI_VENDOR_ESS 0x125D | |
33 | #define PCI_DEVICE_ID_ESS_ESS1968 0x1968 /* Maestro 2 */ | |
34 | #define PCI_DEVICE_ID_ESS_ESS1978 0x1978 /* Maestro 2E */ | |
35 | ||
36 | #define GPIO_DATA 0x60 /* port offset from ESS_IO_BASE */ | |
37 | ||
38 | #define IO_MASK 4 /* mask register offset from GPIO_DATA | |
39 | bits 1=unmask write to given bit */ | |
40 | #define IO_DIR 8 /* direction register offset from GPIO_DATA | |
41 | bits 0/1=read/write direction */ | |
42 | ||
43 | #define GPIO6 0x0040 /* mask bits for GPIO lines */ | |
44 | #define GPIO7 0x0080 | |
45 | #define GPIO8 0x0100 | |
46 | #define GPIO9 0x0200 | |
47 | ||
48 | #define STR_DATA GPIO6 /* radio TEA5757 pins and GPIO bits */ | |
49 | #define STR_CLK GPIO7 | |
50 | #define STR_WREN GPIO8 | |
51 | #define STR_MOST GPIO9 | |
52 | ||
53 | #define FREQ_LO 50*16000 | |
54 | #define FREQ_HI 150*16000 | |
55 | ||
56 | #define FREQ_IF 171200 /* 10.7*16000 */ | |
57 | #define FREQ_STEP 200 /* 12.5*16 */ | |
58 | ||
59 | #define FREQ2BITS(x) ((((unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1))\ | |
60 | /(FREQ_STEP<<2))<<2) /* (x==fmhz*16*1000) -> bits */ | |
61 | ||
62 | #define BITS2FREQ(x) ((x) * FREQ_STEP - FREQ_IF) | |
63 | ||
64 | static int radio_nr = -1; | |
65 | module_param(radio_nr, int, 0); | |
66 | ||
67 | static int radio_ioctl(struct inode *inode, struct file *file, | |
68 | unsigned int cmd, unsigned long arg); | |
69 | ||
70 | static struct file_operations maestro_fops = { | |
71 | .owner = THIS_MODULE, | |
72 | .open = video_exclusive_open, | |
73 | .release = video_exclusive_release, | |
74 | .ioctl = radio_ioctl, | |
75 | .llseek = no_llseek, | |
76 | }; | |
77 | ||
78 | static struct video_device maestro_radio= | |
79 | { | |
80 | .owner = THIS_MODULE, | |
81 | .name = "Maestro radio", | |
82 | .type = VID_TYPE_TUNER, | |
83 | .hardware = VID_HARDWARE_SF16MI, | |
84 | .fops = &maestro_fops, | |
85 | }; | |
86 | ||
87 | static struct radio_device | |
88 | { | |
89 | __u16 io, /* base of Maestro card radio io (GPIO_DATA)*/ | |
90 | muted, /* VIDEO_AUDIO_MUTE */ | |
91 | stereo, /* VIDEO_TUNER_STEREO_ON */ | |
92 | tuned; /* signal strength (0 or 0xffff) */ | |
93 | struct semaphore lock; | |
94 | } radio_unit = {0, 0, 0, 0, }; | |
95 | ||
96 | static __u32 radio_bits_get(struct radio_device *dev) | |
97 | { | |
98 | register __u16 io=dev->io, l, rdata; | |
99 | register __u32 data=0; | |
100 | __u16 omask; | |
101 | omask = inw(io + IO_MASK); | |
102 | outw(~(STR_CLK | STR_WREN), io + IO_MASK); | |
103 | outw(0, io); | |
104 | udelay(16); | |
105 | ||
106 | for (l=24;l--;) { | |
107 | outw(STR_CLK, io); /* HI state */ | |
108 | udelay(2); | |
109 | if(!l) | |
110 | dev->tuned = inw(io) & STR_MOST ? 0 : 0xffff; | |
111 | outw(0, io); /* LO state */ | |
112 | udelay(2); | |
113 | data <<= 1; /* shift data */ | |
114 | rdata = inw(io); | |
115 | if(!l) | |
116 | dev->stereo = rdata & STR_MOST ? | |
117 | 0 : VIDEO_TUNER_STEREO_ON; | |
118 | else | |
119 | if(rdata & STR_DATA) | |
120 | data++; | |
121 | udelay(2); | |
122 | } | |
123 | if(dev->muted) | |
124 | outw(STR_WREN, io); | |
125 | udelay(4); | |
126 | outw(omask, io + IO_MASK); | |
127 | return data & 0x3ffe; | |
128 | } | |
129 | ||
130 | static void radio_bits_set(struct radio_device *dev, __u32 data) | |
131 | { | |
132 | register __u16 io=dev->io, l, bits; | |
133 | __u16 omask, odir; | |
134 | omask = inw(io + IO_MASK); | |
135 | odir = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN); | |
136 | outw(odir | STR_DATA, io + IO_DIR); | |
137 | outw(~(STR_DATA | STR_CLK | STR_WREN), io + IO_MASK); | |
138 | udelay(16); | |
139 | for (l=25;l;l--) { | |
140 | bits = ((data >> 18) & STR_DATA) | STR_WREN ; | |
141 | data <<= 1; /* shift data */ | |
142 | outw(bits, io); /* start strobe */ | |
143 | udelay(2); | |
144 | outw(bits | STR_CLK, io); /* HI level */ | |
145 | udelay(2); | |
146 | outw(bits, io); /* LO level */ | |
147 | udelay(4); | |
148 | } | |
149 | if(!dev->muted) | |
150 | outw(0, io); | |
151 | udelay(4); | |
152 | outw(omask, io + IO_MASK); | |
153 | outw(odir, io + IO_DIR); | |
154 | msleep(125); | |
155 | } | |
156 | ||
157 | inline static int radio_function(struct inode *inode, struct file *file, | |
158 | unsigned int cmd, void *arg) | |
159 | { | |
160 | struct video_device *dev = video_devdata(file); | |
161 | struct radio_device *card=dev->priv; | |
162 | ||
163 | switch(cmd) { | |
164 | case VIDIOCGCAP: { | |
165 | struct video_capability *v = arg; | |
166 | memset(v,0,sizeof(*v)); | |
167 | strcpy(v->name, "Maestro radio"); | |
168 | v->type=VID_TYPE_TUNER; | |
169 | v->channels=v->audios=1; | |
170 | return 0; | |
171 | } | |
172 | case VIDIOCGTUNER: { | |
173 | struct video_tuner *v = arg; | |
174 | if(v->tuner) | |
175 | return -EINVAL; | |
176 | (void)radio_bits_get(card); | |
177 | v->flags = VIDEO_TUNER_LOW | card->stereo; | |
178 | v->signal = card->tuned; | |
179 | strcpy(v->name, "FM"); | |
180 | v->rangelow = FREQ_LO; | |
181 | v->rangehigh = FREQ_HI; | |
182 | v->mode = VIDEO_MODE_AUTO; | |
183 | return 0; | |
184 | } | |
185 | case VIDIOCSTUNER: { | |
186 | struct video_tuner *v = arg; | |
187 | if(v->tuner!=0) | |
188 | return -EINVAL; | |
189 | return 0; | |
190 | } | |
191 | case VIDIOCGFREQ: { | |
192 | unsigned long *freq = arg; | |
193 | *freq = BITS2FREQ(radio_bits_get(card)); | |
194 | return 0; | |
195 | } | |
196 | case VIDIOCSFREQ: { | |
197 | unsigned long *freq = arg; | |
198 | if (*freq<FREQ_LO || *freq>FREQ_HI ) | |
199 | return -EINVAL; | |
200 | radio_bits_set(card, FREQ2BITS(*freq)); | |
201 | return 0; | |
202 | } | |
203 | case VIDIOCGAUDIO: { | |
204 | struct video_audio *v = arg; | |
205 | memset(v,0,sizeof(*v)); | |
206 | strcpy(v->name, "Radio"); | |
207 | v->flags=VIDEO_AUDIO_MUTABLE | card->muted; | |
208 | v->mode=VIDEO_SOUND_STEREO; | |
209 | return 0; | |
210 | } | |
211 | case VIDIOCSAUDIO: { | |
212 | struct video_audio *v = arg; | |
213 | if(v->audio) | |
214 | return -EINVAL; | |
215 | { | |
216 | register __u16 io=card->io; | |
217 | register __u16 omask = inw(io + IO_MASK); | |
218 | outw(~STR_WREN, io + IO_MASK); | |
219 | outw((card->muted = v->flags & VIDEO_AUDIO_MUTE) | |
220 | ? STR_WREN : 0, io); | |
221 | udelay(4); | |
222 | outw(omask, io + IO_MASK); | |
223 | msleep(125); | |
224 | return 0; | |
225 | } | |
226 | } | |
227 | case VIDIOCGUNIT: { | |
228 | struct video_unit *v = arg; | |
229 | v->video=VIDEO_NO_UNIT; | |
230 | v->vbi=VIDEO_NO_UNIT; | |
231 | v->radio=dev->minor; | |
232 | v->audio=0; | |
233 | v->teletext=VIDEO_NO_UNIT; | |
234 | return 0; | |
235 | } | |
236 | default: return -ENOIOCTLCMD; | |
237 | } | |
238 | } | |
239 | ||
240 | static int radio_ioctl(struct inode *inode, struct file *file, | |
241 | unsigned int cmd, unsigned long arg) | |
242 | { | |
243 | struct video_device *dev = video_devdata(file); | |
244 | struct radio_device *card=dev->priv; | |
245 | int ret; | |
246 | ||
247 | down(&card->lock); | |
248 | ret = video_usercopy(inode, file, cmd, arg, radio_function); | |
249 | up(&card->lock); | |
250 | return ret; | |
251 | } | |
252 | ||
253 | static __u16 radio_install(struct pci_dev *pcidev); | |
254 | ||
255 | MODULE_AUTHOR("Adam Tlalka, atlka@pg.gda.pl"); | |
256 | MODULE_DESCRIPTION("Radio driver for the Maestro PCI sound card radio."); | |
257 | MODULE_LICENSE("GPL"); | |
258 | ||
259 | static void __exit maestro_radio_exit(void) | |
260 | { | |
261 | video_unregister_device(&maestro_radio); | |
262 | } | |
263 | ||
264 | static int __init maestro_radio_init(void) | |
265 | { | |
266 | register __u16 found=0; | |
267 | struct pci_dev *pcidev = NULL; | |
268 | while(!found && (pcidev = pci_find_device(PCI_VENDOR_ESS, | |
269 | PCI_DEVICE_ID_ESS_ESS1968, | |
270 | pcidev))) | |
271 | found |= radio_install(pcidev); | |
272 | while(!found && (pcidev = pci_find_device(PCI_VENDOR_ESS, | |
273 | PCI_DEVICE_ID_ESS_ESS1978, | |
274 | pcidev))) | |
275 | found |= radio_install(pcidev); | |
276 | if(!found) { | |
277 | printk(KERN_INFO "radio-maestro: no devices found.\n"); | |
278 | return -ENODEV; | |
279 | } | |
280 | return 0; | |
281 | } | |
282 | ||
283 | module_init(maestro_radio_init); | |
284 | module_exit(maestro_radio_exit); | |
285 | ||
286 | inline static __u16 radio_power_on(struct radio_device *dev) | |
287 | { | |
288 | register __u16 io=dev->io; | |
289 | register __u32 ofreq; | |
290 | __u16 omask, odir; | |
291 | omask = inw(io + IO_MASK); | |
292 | odir = (inw(io + IO_DIR) & ~STR_DATA) | (STR_CLK | STR_WREN); | |
293 | outw(odir & ~STR_WREN, io + IO_DIR); | |
294 | dev->muted = inw(io) & STR_WREN ? 0 : VIDEO_AUDIO_MUTE; | |
295 | outw(odir, io + IO_DIR); | |
296 | outw(~(STR_WREN | STR_CLK), io + IO_MASK); | |
297 | outw(dev->muted ? 0 : STR_WREN, io); | |
298 | udelay(16); | |
299 | outw(omask, io + IO_MASK); | |
300 | ofreq = radio_bits_get(dev); | |
301 | if((ofreq<FREQ2BITS(FREQ_LO)) || (ofreq>FREQ2BITS(FREQ_HI))) | |
302 | ofreq = FREQ2BITS(FREQ_LO); | |
303 | radio_bits_set(dev, ofreq); | |
304 | return (ofreq == radio_bits_get(dev)); | |
305 | } | |
306 | ||
307 | static __u16 radio_install(struct pci_dev *pcidev) | |
308 | { | |
309 | if(((pcidev->class >> 8) & 0xffff) != PCI_CLASS_MULTIMEDIA_AUDIO) | |
310 | return 0; | |
311 | ||
312 | radio_unit.io = pcidev->resource[0].start + GPIO_DATA; | |
313 | maestro_radio.priv = &radio_unit; | |
314 | init_MUTEX(&radio_unit.lock); | |
315 | ||
316 | if(radio_power_on(&radio_unit)) { | |
317 | if(video_register_device(&maestro_radio, VFL_TYPE_RADIO, radio_nr)==-1) { | |
318 | printk("radio-maestro: can't register device!"); | |
319 | return 0; | |
320 | } | |
321 | printk(KERN_INFO "radio-maestro: version " | |
322 | DRIVER_VERSION | |
323 | " time " | |
324 | __TIME__ " " | |
325 | __DATE__ | |
326 | "\n"); | |
327 | printk(KERN_INFO "radio-maestro: radio chip initialized\n"); | |
328 | return 1; | |
329 | } else | |
330 | return 0; | |
331 | } | |
332 |