Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[linux-2.6.git] / drivers / media / video / 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, __func__, ##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 i2c_packet_limit = 16;
50
51         if (dev->dev_type == TM6010)
52                 i2c_packet_limit = 80;
53
54         if (!buf)
55                 return -1;
56
57         if (len < 1 || len > i2c_packet_limit) {
58                 printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
59                         len, i2c_packet_limit);
60                 return -1;
61         }
62
63         /* capture mutex */
64         rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
65                 USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
66                 addr | reg << 8, 0, buf, len);
67
68         if (rc < 0) {
69                 /* release mutex */
70                 return rc;
71         }
72
73         /* release mutex */
74         return rc;
75 }
76
77 /* Generic read - doesn't work fine with 16bit registers */
78 static int tm6000_i2c_recv_regs(struct tm6000_core *dev, unsigned char addr,
79                                 __u8 reg, char *buf, int len)
80 {
81         int rc;
82         u8 b[2];
83         unsigned int i2c_packet_limit = 16;
84
85         if (dev->dev_type == TM6010)
86                 i2c_packet_limit = 64;
87
88         if (!buf)
89                 return -1;
90
91         if (len < 1 || len > i2c_packet_limit) {
92                 printk(KERN_ERR "Incorrect length of i2c packet = %d, limit set to %d\n",
93                         len, i2c_packet_limit);
94                 return -1;
95         }
96
97         /* capture mutex */
98         if ((dev->caps.has_zl10353) && (dev->demod_addr << 1 == addr) && (reg % 2 == 0)) {
99                 /*
100                  * Workaround an I2C bug when reading from zl10353
101                  */
102                 reg -= 1;
103                 len += 1;
104
105                 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
106                         REQ_16_SET_GET_I2C_WR1_RDN, addr | reg << 8, 0, b, len);
107
108                 *buf = b[1];
109         } else {
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, buf, len);
112         }
113
114         /* release mutex */
115         return rc;
116 }
117
118 /*
119  * read from a 16bit register
120  * for example xc2028, xc3028 or xc3028L
121  */
122 static int tm6000_i2c_recv_regs16(struct tm6000_core *dev, unsigned char addr,
123                                   __u16 reg, char *buf, int len)
124 {
125         int rc;
126         unsigned char ureg;
127
128         if (!buf || len != 2)
129                 return -1;
130
131         /* capture mutex */
132         if (dev->dev_type == TM6010) {
133                 ureg = reg & 0xFF;
134                 rc = tm6000_read_write_usb(dev, USB_DIR_OUT | USB_TYPE_VENDOR |
135                         USB_RECIP_DEVICE, REQ_16_SET_GET_I2C_WR1_RDN,
136                         addr | (reg & 0xFF00), 0, &ureg, 1);
137
138                 if (rc < 0) {
139                         /* release mutex */
140                         return rc;
141                 }
142
143                 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
144                         USB_RECIP_DEVICE, REQ_35_AFTEK_TUNER_READ,
145                         reg, 0, buf, len);
146         } else {
147                 rc = tm6000_read_write_usb(dev, USB_DIR_IN | USB_TYPE_VENDOR |
148                         USB_RECIP_DEVICE, REQ_14_SET_GET_I2C_WR2_RDN,
149                         addr, reg, buf, len);
150         }
151
152         /* release mutex */
153         return rc;
154 }
155
156 static int tm6000_i2c_xfer(struct i2c_adapter *i2c_adap,
157                            struct i2c_msg msgs[], int num)
158 {
159         struct tm6000_core *dev = i2c_adap->algo_data;
160         int addr, rc, i, byte;
161
162         if (num <= 0)
163                 return 0;
164         for (i = 0; i < num; i++) {
165                 addr = (msgs[i].addr << 1) & 0xff;
166                 i2c_dprintk(2, "%s %s addr=0x%x len=%d:",
167                          (msgs[i].flags & I2C_M_RD) ? "read" : "write",
168                          i == num - 1 ? "stop" : "nonstop", addr, msgs[i].len);
169                 if (msgs[i].flags & I2C_M_RD) {
170                         /* read request without preceding register selection */
171                         /*
172                          * The TM6000 only supports a read transaction
173                          * immediately after a 1 or 2 byte write to select
174                          * a register.  We cannot fulfil this request.
175                          */
176                         i2c_dprintk(2, " read without preceding write not"
177                                        " supported");
178                         rc = -EOPNOTSUPP;
179                         goto err;
180                 } else if (i + 1 < num && msgs[i].len <= 2 &&
181                            (msgs[i + 1].flags & I2C_M_RD) &&
182                            msgs[i].addr == msgs[i + 1].addr) {
183                         /* 1 or 2 byte write followed by a read */
184                         if (i2c_debug >= 2)
185                                 for (byte = 0; byte < msgs[i].len; byte++)
186                                         printk(KERN_CONT " %02x", msgs[i].buf[byte]);
187                         i2c_dprintk(2, "; joined to read %s len=%d:",
188                                     i == num - 2 ? "stop" : "nonstop",
189                                     msgs[i + 1].len);
190
191                         if (msgs[i].len == 2) {
192                                 rc = tm6000_i2c_recv_regs16(dev, addr,
193                                         msgs[i].buf[0] << 8 | msgs[i].buf[1],
194                                         msgs[i + 1].buf, msgs[i + 1].len);
195                         } else {
196                                 rc = tm6000_i2c_recv_regs(dev, addr, msgs[i].buf[0],
197                                         msgs[i + 1].buf, msgs[i + 1].len);
198                         }
199
200                         i++;
201
202                         if (addr == dev->tuner_addr << 1) {
203                                 tm6000_set_reg(dev, REQ_50_SET_START, 0, 0);
204                                 tm6000_set_reg(dev, REQ_51_SET_STOP, 0, 0);
205                         }
206                         if (i2c_debug >= 2)
207                                 for (byte = 0; byte < msgs[i].len; byte++)
208                                         printk(KERN_CONT " %02x", msgs[i].buf[byte]);
209                 } else {
210                         /* write bytes */
211                         if (i2c_debug >= 2)
212                                 for (byte = 0; byte < msgs[i].len; byte++)
213                                         printk(KERN_CONT " %02x", msgs[i].buf[byte]);
214                         rc = tm6000_i2c_send_regs(dev, addr, msgs[i].buf[0],
215                                 msgs[i].buf + 1, msgs[i].len - 1);
216                 }
217                 if (i2c_debug >= 2)
218                         printk(KERN_CONT "\n");
219                 if (rc < 0)
220                         goto err;
221         }
222
223         return num;
224 err:
225         i2c_dprintk(2, " ERROR: %i\n", rc);
226         return rc;
227 }
228
229 static int tm6000_i2c_eeprom(struct tm6000_core *dev)
230 {
231         int i, rc;
232         unsigned char *p = dev->eedata;
233         unsigned char bytes[17];
234
235         dev->i2c_client.addr = 0xa0 >> 1;
236         dev->eedata_size = 0;
237
238         bytes[16] = '\0';
239         for (i = 0; i < sizeof(dev->eedata); ) {
240                 *p = i;
241                 rc = tm6000_i2c_recv_regs(dev, 0xa0, i, p, 1);
242                 if (rc < 1) {
243                         if (p == dev->eedata)
244                                 goto noeeprom;
245                         else {
246                                 printk(KERN_WARNING
247                                 "%s: i2c eeprom read error (err=%d)\n",
248                                 dev->name, rc);
249                         }
250                         return -EINVAL;
251                 }
252                 dev->eedata_size++;
253                 p++;
254                 if (0 == (i % 16))
255                         printk(KERN_INFO "%s: i2c eeprom %02x:", dev->name, i);
256                 printk(KERN_CONT " %02x", dev->eedata[i]);
257                 if ((dev->eedata[i] >= ' ') && (dev->eedata[i] <= 'z'))
258                         bytes[i%16] = dev->eedata[i];
259                 else
260                         bytes[i%16] = '.';
261
262                 i++;
263
264                 if (0 == (i % 16)) {
265                         bytes[16] = '\0';
266                         printk(KERN_CONT "  %s\n", bytes);
267                 }
268         }
269         if (0 != (i%16)) {
270                 bytes[i%16] = '\0';
271                 for (i %= 16; i < 16; i++)
272                         printk(KERN_CONT "   ");
273                 printk(KERN_CONT "  %s\n", bytes);
274         }
275
276         return 0;
277
278 noeeprom:
279         printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
280                dev->name, rc);
281         return -EINVAL;
282 }
283
284 /* ----------------------------------------------------------- */
285
286 /*
287  * functionality()
288  */
289 static u32 functionality(struct i2c_adapter *adap)
290 {
291         return I2C_FUNC_SMBUS_EMUL;
292 }
293
294 static const struct i2c_algorithm tm6000_algo = {
295         .master_xfer   = tm6000_i2c_xfer,
296         .functionality = functionality,
297 };
298
299 /* ----------------------------------------------------------- */
300
301 /*
302  * tm6000_i2c_register()
303  * register i2c bus
304  */
305 int tm6000_i2c_register(struct tm6000_core *dev)
306 {
307         int rc;
308
309         dev->i2c_adap.owner = THIS_MODULE;
310         dev->i2c_adap.algo = &tm6000_algo;
311         dev->i2c_adap.dev.parent = &dev->udev->dev;
312         strlcpy(dev->i2c_adap.name, dev->name, sizeof(dev->i2c_adap.name));
313         dev->i2c_adap.algo_data = dev;
314         i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
315         rc = i2c_add_adapter(&dev->i2c_adap);
316         if (rc)
317                 return rc;
318
319         dev->i2c_client.adapter = &dev->i2c_adap;
320         strlcpy(dev->i2c_client.name, "tm6000 internal", I2C_NAME_SIZE);
321         tm6000_i2c_eeprom(dev);
322
323         return 0;
324 }
325
326 /*
327  * tm6000_i2c_unregister()
328  * unregister i2c_bus
329  */
330 int tm6000_i2c_unregister(struct tm6000_core *dev)
331 {
332         i2c_del_adapter(&dev->i2c_adap);
333         return 0;
334 }