1 /*
2 bttv-if.c -- interfaces to other kernel modules
3 all the i2c code is here
4 also the gpio interface exported by bttv (used by lirc)
5
6 bttv - Bt848 frame grabber driver
7
8 Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de)
9 & Marcus Metzler (mocm@thp.uni-koeln.de)
10 (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
11
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
16
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
21
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25
26 */
27
28 #include <linux/module.h>
29 #include <linux/init.h>
30
31 #include <asm/io.h>
32
33 #include "bttvp.h"
34
35 static struct i2c_algo_bit_data bttv_i2c_algo_template;
36 static struct i2c_adapter bttv_i2c_adap_template;
37 static struct i2c_client bttv_i2c_client_template;
38
39 EXPORT_SYMBOL(bttv_get_cardinfo);
40 EXPORT_SYMBOL(bttv_get_pcidev);
41 EXPORT_SYMBOL(bttv_get_id);
42 EXPORT_SYMBOL(bttv_gpio_enable);
43 EXPORT_SYMBOL(bttv_read_gpio);
44 EXPORT_SYMBOL(bttv_write_gpio);
45 EXPORT_SYMBOL(bttv_get_gpio_queue);
46 EXPORT_SYMBOL(bttv_i2c_call);
47
48 /* ----------------------------------------------------------------------- */
49 /* Exported functions - for other modules which want to access the */
50 /* gpio ports (IR for example) */
51 /* see bttv.h for comments */
52
bttv_get_cardinfo(unsigned int card,int * type,unsigned * cardid)53 int bttv_get_cardinfo(unsigned int card, int *type, unsigned *cardid)
54 {
55 if (card >= bttv_num) {
56 return -1;
57 }
58 *type = bttvs[card].type;
59 *cardid = bttvs[card].cardid;
60 return 0;
61 }
62
bttv_get_pcidev(unsigned int card)63 struct pci_dev* bttv_get_pcidev(unsigned int card)
64 {
65 if (card >= bttv_num)
66 return NULL;
67 return bttvs[card].dev;
68 }
69
bttv_get_id(unsigned int card)70 int bttv_get_id(unsigned int card)
71 {
72 printk("bttv_get_id is obsolete, use bttv_get_cardinfo instead\n");
73 if (card >= bttv_num) {
74 return -1;
75 }
76 return bttvs[card].type;
77 }
78
bttv_gpio_enable(unsigned int card,unsigned long mask,unsigned long data)79 int bttv_gpio_enable(unsigned int card, unsigned long mask, unsigned long data)
80 {
81 struct bttv *btv;
82
83 if (card >= bttv_num) {
84 return -EINVAL;
85 }
86
87 btv = &bttvs[card];
88 btaor(data, ~mask, BT848_GPIO_OUT_EN);
89 if (bttv_gpio)
90 bttv_gpio_tracking(btv,"extern enable");
91 return 0;
92 }
93
bttv_read_gpio(unsigned int card,unsigned long * data)94 int bttv_read_gpio(unsigned int card, unsigned long *data)
95 {
96 struct bttv *btv;
97
98 if (card >= bttv_num) {
99 return -EINVAL;
100 }
101
102 btv = &bttvs[card];
103
104 if(btv->shutdown) {
105 return -ENODEV;
106 }
107
108 /* prior setting BT848_GPIO_REG_INP is (probably) not needed
109 because we set direct input on init */
110 *data = btread(BT848_GPIO_DATA);
111 return 0;
112 }
113
bttv_write_gpio(unsigned int card,unsigned long mask,unsigned long data)114 int bttv_write_gpio(unsigned int card, unsigned long mask, unsigned long data)
115 {
116 struct bttv *btv;
117
118 if (card >= bttv_num) {
119 return -EINVAL;
120 }
121
122 btv = &bttvs[card];
123
124 /* prior setting BT848_GPIO_REG_INP is (probably) not needed
125 because direct input is set on init */
126 btaor(data & mask, ~mask, BT848_GPIO_DATA);
127 if (bttv_gpio)
128 bttv_gpio_tracking(btv,"extern write");
129 return 0;
130 }
131
bttv_get_gpio_queue(unsigned int card)132 wait_queue_head_t* bttv_get_gpio_queue(unsigned int card)
133 {
134 struct bttv *btv;
135
136 if (card >= bttv_num) {
137 return NULL;
138 }
139
140 btv = &bttvs[card];
141 if (bttvs[card].shutdown) {
142 return NULL;
143 }
144 return &btv->gpioq;
145 }
146
147
148 /* ----------------------------------------------------------------------- */
149 /* I2C functions */
150
bttv_bit_setscl(void * data,int state)151 void bttv_bit_setscl(void *data, int state)
152 {
153 struct bttv *btv = (struct bttv*)data;
154
155 if (state)
156 btv->i2c_state |= 0x02;
157 else
158 btv->i2c_state &= ~0x02;
159 btwrite(btv->i2c_state, BT848_I2C);
160 btread(BT848_I2C);
161 }
162
bttv_bit_setsda(void * data,int state)163 void bttv_bit_setsda(void *data, int state)
164 {
165 struct bttv *btv = (struct bttv*)data;
166
167 if (state)
168 btv->i2c_state |= 0x01;
169 else
170 btv->i2c_state &= ~0x01;
171 btwrite(btv->i2c_state, BT848_I2C);
172 btread(BT848_I2C);
173 }
174
bttv_bit_getscl(void * data)175 static int bttv_bit_getscl(void *data)
176 {
177 struct bttv *btv = (struct bttv*)data;
178 int state;
179
180 state = btread(BT848_I2C) & 0x02 ? 1 : 0;
181 return state;
182 }
183
bttv_bit_getsda(void * data)184 static int bttv_bit_getsda(void *data)
185 {
186 struct bttv *btv = (struct bttv*)data;
187 int state;
188
189 state = btread(BT848_I2C) & 0x01;
190 return state;
191 }
192
bttv_inc_use(struct i2c_adapter * adap)193 static void bttv_inc_use(struct i2c_adapter *adap)
194 {
195 MOD_INC_USE_COUNT;
196 }
197
bttv_dec_use(struct i2c_adapter * adap)198 static void bttv_dec_use(struct i2c_adapter *adap)
199 {
200 MOD_DEC_USE_COUNT;
201 }
202
attach_inform(struct i2c_client * client)203 static int attach_inform(struct i2c_client *client)
204 {
205 struct bttv *btv = i2c_get_adapdata(client->adapter);
206
207 if (btv->tuner_type != UNSET)
208 bttv_call_i2c_clients(btv,TUNER_SET_TYPE,&btv->tuner_type);
209 if (btv->pinnacle_id != UNSET)
210 bttv_call_i2c_clients(btv,AUDC_CONFIG_PINNACLE,
211 &btv->pinnacle_id);
212
213 if (bttv_debug)
214 printk("bttv%d: i2c attach [client=%s]\n",
215 btv->nr, i2c_clientname(client));
216 return 0;
217 }
218
bttv_call_i2c_clients(struct bttv * btv,unsigned int cmd,void * arg)219 void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
220 {
221 if (0 != btv->i2c_rc)
222 return;
223 i2c_clients_command(&btv->i2c_adap, cmd, arg);
224 }
225
bttv_i2c_call(unsigned int card,unsigned int cmd,void * arg)226 void bttv_i2c_call(unsigned int card, unsigned int cmd, void *arg)
227 {
228 if (card >= bttv_num)
229 return;
230 bttv_call_i2c_clients(&bttvs[card], cmd, arg);
231 }
232
233 static struct i2c_algo_bit_data bttv_i2c_algo_template = {
234 .setsda = bttv_bit_setsda,
235 .setscl = bttv_bit_setscl,
236 .getsda = bttv_bit_getsda,
237 .getscl = bttv_bit_getscl,
238 .udelay = 16,
239 .mdelay = 10,
240 .timeout = 200,
241 };
242
243 static struct i2c_adapter bttv_i2c_adap_template = {
244 .inc_use = bttv_inc_use,
245 .dec_use = bttv_dec_use,
246 #ifdef I2C_ADAP_CLASS_TV_ANALOG
247 .class = I2C_ADAP_CLASS_TV_ANALOG,
248 #endif
249 I2C_DEVNAME("bt848"),
250 .id = I2C_HW_B_BT848,
251 .client_register = attach_inform,
252 };
253
254 static struct i2c_client bttv_i2c_client_template = {
255 I2C_DEVNAME("bttv internal"),
256 .id = -1,
257 };
258
259
260 /* read I2C */
bttv_I2CRead(struct bttv * btv,unsigned char addr,char * probe_for)261 int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
262 {
263 unsigned char buffer = 0;
264
265 if (0 != btv->i2c_rc)
266 return -1;
267 if (bttv_verbose && NULL != probe_for)
268 printk(KERN_INFO "bttv%d: i2c: checking for %s @ 0x%02x... ",
269 btv->nr,probe_for,addr);
270 btv->i2c_client.addr = addr >> 1;
271 if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
272 if (NULL != probe_for) {
273 if (bttv_verbose)
274 printk("not found\n");
275 } else
276 printk(KERN_WARNING "bttv%d: i2c read 0x%x: error\n",
277 btv->nr,addr);
278 return -1;
279 }
280 if (bttv_verbose && NULL != probe_for)
281 printk("found\n");
282 return buffer;
283 }
284
285 /* write I2C */
bttv_I2CWrite(struct bttv * btv,unsigned char addr,unsigned char b1,unsigned char b2,int both)286 int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
287 unsigned char b2, int both)
288 {
289 unsigned char buffer[2];
290 int bytes = both ? 2 : 1;
291
292 if (0 != btv->i2c_rc)
293 return -1;
294 btv->i2c_client.addr = addr >> 1;
295 buffer[0] = b1;
296 buffer[1] = b2;
297 if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
298 return -1;
299 return 0;
300 }
301
302 /* read EEPROM content */
bttv_readee(struct bttv * btv,unsigned char * eedata,int addr)303 void __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
304 {
305 int i;
306
307 if (bttv_I2CWrite(btv, addr, 0, -1, 0)<0) {
308 printk(KERN_WARNING "bttv: readee error\n");
309 return;
310 }
311 btv->i2c_client.addr = addr >> 1;
312 for (i=0; i<256; i+=16) {
313 if (16 != i2c_master_recv(&btv->i2c_client,eedata+i,16)) {
314 printk(KERN_WARNING "bttv: readee error\n");
315 break;
316 }
317 }
318 }
319
320 /* init + register i2c algo-bit adapter */
init_bttv_i2c(struct bttv * btv)321 int __devinit init_bttv_i2c(struct bttv *btv)
322 {
323 memcpy(&btv->i2c_adap, &bttv_i2c_adap_template,
324 sizeof(struct i2c_adapter));
325 memcpy(&btv->i2c_algo, &bttv_i2c_algo_template,
326 sizeof(struct i2c_algo_bit_data));
327 memcpy(&btv->i2c_client, &bttv_i2c_client_template,
328 sizeof(struct i2c_client));
329
330 sprintf(btv->i2c_adap.name, "bt848 #%d", btv->nr);
331
332 btv->i2c_algo.data = btv;
333 i2c_set_adapdata(&btv->i2c_adap, btv);
334 btv->i2c_adap.algo_data = &btv->i2c_algo;
335 btv->i2c_client.adapter = &btv->i2c_adap;
336
337 bttv_bit_setscl(btv,1);
338 bttv_bit_setsda(btv,1);
339
340 btv->i2c_rc = i2c_bit_add_bus(&btv->i2c_adap);
341 return btv->i2c_rc;
342 }
343
344 /*
345 * Local variables:
346 * c-basic-offset: 8
347 * End:
348 */
349