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beceem: update TODO list
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / tm6000 / tm6000-i2c.c
1 /*
2 * tm6000-i2c.c - driver for TM5600/TM6000/TM6010 USB video capture devices
3 *
4 * Copyright (C) 2006-2007 Mauro Carvalho Chehab <mchehab@infradead.org>
5 *
6 * Copyright (C) 2007 Michel Ludwig <michel.ludwig@gmail.com>
7 * - Fix SMBus Read Byte command
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation version 2
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23 #include <linux/module.h>
24 #include <linux/kernel.h>
25 #include <linux/usb.h>
26 #include <linux/i2c.h>
27
28 #include "tm6000.h"
29 #include "tm6000-regs.h"
30 #include <media/v4l2-common.h>
31 #include <media/tuner.h>
32 #include "tuner-xc2028.h"
33
34
35 /* ----------------------------------------------------------- */
36
37 static unsigned int i2c_debug;
38 module_param(i2c_debug, int, 0644);
39 MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
40
41 #define i2c_dprintk(lvl, fmt, args...) if (i2c_debug >= lvl) do { \
42 printk(KERN_DEBUG "%s at %s: " fmt, \
43 dev->name, __FUNCTION__ , ##args); } while (0)
44
45 static int tm6000_i2c_send_regs(struct tm6000_core *dev, unsigned char addr,
46 __u8 reg, char *buf, int len)
47 {
48 int rc;
49 unsigned int tsleep;
50 unsigned int i2c_packet_limit = 16;
51
52 if (dev->dev_type == TM6010)
53 i2c_packet_limit = 64;
54
55 if (!buf)
56 return -1;
57
58 if (len < 1 || len > i2c_packet_limit) {
59 printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
60 len, i2c_packet_limit);
61 return -1;
62 }
63
64 /* capture mutex */
65 rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
66 USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
67 addr | reg << 8, 0, buf, len);
68
69 if (rc < 0) {
70 /* release mutex */
71 return rc;
72 }
73
74 /* Calculate delay time, 14000us for 64 bytes */
75 tsleep = ((len * 200) + 200 + 1000) / 1000;
76 msleep(tsleep);
77
78 /* release mutex */
79 return rc;
80 }
81
82 /* Generic read - doesn't work fine with 16bit registers */
83 static int tm6000_i2c_recv_regs(struct tm6000_core *dev, unsigned char addr,
84 __u8 reg, char *buf, int len)
85 {
86 int rc;
87 u8 b[2];
88 unsigned int i2c_packet_limit = 16;
89
90 if (dev->dev_type == TM6010)
91 i2c_packet_limit = 64;
92
93 if (!buf)
94 return -1;
95
96 if (len < 1 || len > i2c_packet_limit) {
97 printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
98 len, i2c_packet_limit);
99 return -1;
100 }
101
102 /* capture mutex */
103 if ((dev->caps.has_zl10353) && (dev->demod_addr << 1 == addr) && (reg % 2 == 0)) {
104 /*
105 * Workaround an I2C bug when reading from zl10353
106 */
107 reg -= 1;
108 len += 1;
109
110 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
111 REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, b, len);
112
113 *buf = b[1];
114 } else {
115 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
116 REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, buf, len);
117 }
118
119 /* release mutex */
120 return rc;
121 }
122
123 /*
124 * read from a 16bit register
125 * for example xc2028, xc3028 or xc3028L
126 */
127 static int tm6000_i2c_recv_regs16(struct tm6000_core *dev, unsigned char addr,
128 __u16 reg, char *buf, int len)
129 {
130 int rc;
131 unsigned char ureg;
132
133 if (!buf || len != 2)
134 return -1;
135
136 /* capture mutex */
137 if (dev->dev_type == TM6010) {
138 ureg = reg & 0xFF;
139 rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
140 USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
141 addr | (reg & 0xFF00), 0, &ureg, 1);
142
143 if (rc < 0) {
144 /* release mutex */
145 return rc;
146 }
147
148 msleep(1400 / 1000);
149 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
150 USB_RECIP_DEVICE, REQ_35_AFTEK_TUNER_READ,
151 reg, 0, buf, len);
152 } else {
153 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
154 USB_RECIP_DEVICE, REQ_14_SET_GET_I2C_WR2_RDN,
155 addr, reg, buf, len);
156 }
157
158 /* release mutex */
159 return rc;
160 }
161
162 static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap,
163 struct i2c_msg msgs[], int num)
164 {
165 struct tm6000_core *dev = i2c_adap->algo_data;
166 int addr, rc, i, byte;
167
168 if (num <= 0)
169 return 0;
170 for (i = 0; i < num; i++) {
171 addr = (msgs[i].addr << 1) & 0xff;
172 i2c_dprintk(2, "%s %s addr=0x%x len=%d:",
173 (msgs[i].flags & I2C_M_RD) ? "read" : "write",
174 i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
175 if (msgs[i].flags & I2C_M_RD) {
176 /* read request without preceding register selection */
177 /*
178 * The TM6000 only supports a read transaction
179 * immediately after a 1 or 2 byte write to select
180 * a register. We cannot fulfil this request.
181 */
182 i2c_dprintk(2, " read without preceding write not"
183 " supported");
184 rc = -EOPNOTSUPP;
185 goto err;
186 } else if (i + 1 < num && msgs[i].len <= 2 &&
187 (msgs[i + 1].flags & I2C_M_RD) &&
188 msgs[i].addr == msgs[i + 1].addr) {
189 /* 1 or 2 byte write followed by a read */
190 if (i2c_debug >= 2)
191 for (byte = 0; byte < msgs[i].len; byte++)
192 printk(" %02x", msgs[i].buf[byte]);
193 i2c_dprintk(2, "; joined to read %s len=%d:",
194 i == num - 2 ? "stop" : "nonstop",
195 msgs[i + 1].len);
196
197 if (msgs[i].len == 2) {
198 rc = tm6000_i2c_recv_regs16(dev, addr,
199 msgs[i].buf[0] << 8 | msgs[i].buf[1],
200 msgs[i + 1].buf, msgs[i + 1].len);
201 } else {
202 rc = tm6000_i2c_recv_regs(dev, addr, msgs[i].buf[0],
203 msgs[i + 1].buf, msgs[i + 1].len);
204 }
205
206 i++;
207
208 if (addr == dev->tuner_addr << 1) {
209 tm6000_set_reg(dev, REQ_50_SET_START, 0, 0);
210 tm6000_set_reg(dev, REQ_51_SET_STOP, 0, 0);
211 }
212 if (i2c_debug >= 2)
213 for (byte = 0; byte < msgs[i].len; byte++)
214 printk(" %02x", msgs[i].buf[byte]);
215 } else {
216 /* write bytes */
217 if (i2c_debug >= 2)
218 for (byte = 0; byte < msgs[i].len; byte++)
219 printk(" %02x", msgs[i].buf[byte]);
220 rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0],
221 msgs[i].buf + 1, msgs[i].len - 1);
222
223 if (addr == dev->tuner_addr << 1) {
224 tm6000_set_reg(dev, REQ_50_SET_START, 0, 0);
225 tm6000_set_reg(dev, REQ_51_SET_STOP, 0, 0);
226 }
227 }
228 if (i2c_debug >= 2)
229 printk("\n");
230 if (rc < 0)
231 goto err;
232 }
233
234 return num;
235 err:
236 i2c_dprintk(2, " ERROR: %i\n", rc);
237 return rc;
238 }
239
240 static int tm6000_i2c_eeprom(struct tm6000_core *dev,
241 unsigned char *eedata, int len)
242 {
243 int i, rc;
244 unsigned char *p = eedata;
245 unsigned char bytes[17];
246
247 dev->i2c_client.addr = 0xa0 >> 1;
248
249 bytes[16] = '\0';
250 for (i = 0; i < len; ) {
251 *p = i;
252 rc = tm6000_i2c_recv_regs(dev, 0xa0, i, p, 1);
253 if (rc < 1) {
254 if (p == eedata)
255 goto noeeprom;
256 else {
257 printk(KERN_WARNING
258 "%s: i2c eeprom read error (err=%d)\n",
259 dev->name, rc);
260 }
261 return -1;
262 }
263 p++;
264 if (0 == (i % 16))
265 printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
266 printk(" %02x", eedata[i]);
267 if ((eedata[i] >= ' ') && (eedata[i] <= 'z'))
268 bytes[i%16] = eedata[i];
269 else
270 bytes[i%16] = '.';
271
272 i++;
273
274 if (0 == (i % 16)) {
275 bytes[16] = '\0';
276 printk(" %s\n", bytes);
277 }
278 }
279 if (0 != (i%16)) {
280 bytes[i%16] = '\0';
281 for (i %= 16; i < 16; i++)
282 printk(" ");
283 }
284 printk(" %s\n", bytes);
285
286 return 0;
287
288 noeeprom:
289 printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
290 dev->name, rc);
291 return rc;
292 }
293
294 /* ----------------------------------------------------------- */
295
296 /*
297 * functionality()
298 */
299 static u32 functionality(struct i2c_adapter *adap)
300 {
301 return I2C_FUNC_SMBUS_EMUL;
302 }
303
304 #define mass_write(addr, reg, data...) \
305 { static const u8 _val[] = data; \
306 rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR, \
307 REQ_16_SET_GET_I2C_WR1_RDN, (reg<<8)+addr, 0x00, (u8 *) _val, \
308 ARRAY_SIZE(_val)); \
309 if (rc < 0) { \
310 printk(KERN_ERR "Error on line %d: %d\n", __LINE__, rc); \
311 return rc; \
312 } \
313 msleep(10); \
314 }
315
316 static struct i2c_algorithm tm6000_algo = {
317 .master_xfer = tm6000_i2c_xfer,
318 .functionality = functionality,
319 };
320
321 static struct i2c_adapter tm6000_adap_template = {
322 .owner = THIS_MODULE,
323 .class = I2C_CLASS_TV_ANALOG | I2C_CLASS_TV_DIGITAL,
324 .name = "tm6000",
325 .algo = &tm6000_algo,
326 };
327
328 static struct i2c_client tm6000_client_template = {
329 .name = "tm6000 internal",
330 };
331
332 /* ----------------------------------------------------------- */
333
334 /*
335 * tm6000_i2c_register()
336 * register i2c bus
337 */
338 int tm6000_i2c_register(struct tm6000_core *dev)
339 {
340 unsigned char eedata[256];
341
342 dev->i2c_adap = tm6000_adap_template;
343 dev->i2c_adap.dev.parent = &dev->udev->dev;
344 strcpy(dev->i2c_adap.name, dev->name);
345 dev->i2c_adap.algo_data = dev;
346 i2c_add_adapter(&dev->i2c_adap);
347
348 dev->i2c_client = tm6000_client_template;
349 dev->i2c_client.adapter = &dev->i2c_adap;
350
351 i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
352
353 tm6000_i2c_eeprom(dev, eedata, sizeof(eedata));
354
355 return 0;
356 }
357
358 /*
359 * tm6000_i2c_unregister()
360 * unregister i2c_bus
361 */
362 int tm6000_i2c_unregister(struct tm6000_core *dev)
363 {
364 i2c_del_adapter(&dev->i2c_adap);
365 return 0;
366 }
kernel source for telekom puls (alcatel/mediatek)