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pvrusb2-eeprom.c
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1 /*
2  *
3  *
4  * Copyright (C) 2005 Mike Isely <[email protected]>
5  * Copyright (C) 2004 Aurelien Alleaume <[email protected]>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  *
20  */
21 
22 #include <linux/slab.h>
23 #include "pvrusb2-eeprom.h"
24 #include "pvrusb2-hdw-internal.h"
25 #include "pvrusb2-debug.h"
26 
27 #define trace_eeprom(...) pvr2_trace(PVR2_TRACE_EEPROM,__VA_ARGS__)
28 
29 
30 
31 /*
32 
33  Read and analyze data in the eeprom. Use tveeprom to figure out
34  the packet structure, since this is another Hauppauge device and
35  internally it has a family resemblance to ivtv-type devices
36 
37 */
38 
39 #include <media/tveeprom.h>
40 
41 /* We seem to only be interested in the last 128 bytes of the EEPROM */
42 #define EEPROM_SIZE 128
43 
44 /* Grab EEPROM contents, needed for direct method. */
45 static u8 *pvr2_eeprom_fetch(struct pvr2_hdw *hdw)
46 {
47  struct i2c_msg msg[2];
48  u8 *eeprom;
49  u8 iadd[2];
50  u8 addr;
51  u16 eepromSize;
52  unsigned int offs;
53  int ret;
54  int mode16 = 0;
55  unsigned pcnt,tcnt;
56  eeprom = kmalloc(EEPROM_SIZE,GFP_KERNEL);
57  if (!eeprom) {
59  "Failed to allocate memory"
60  " required to read eeprom");
61  return NULL;
62  }
63 
64  trace_eeprom("Value for eeprom addr from controller was 0x%x",
65  hdw->eeprom_addr);
66  addr = hdw->eeprom_addr;
67  /* Seems that if the high bit is set, then the *real* eeprom
68  address is shifted right now bit position (noticed this in
69  newer PVR USB2 hardware) */
70  if (addr & 0x80) addr >>= 1;
71 
72  /* FX2 documentation states that a 16bit-addressed eeprom is
73  expected if the I2C address is an odd number (yeah, this is
74  strange but it's what they do) */
75  mode16 = (addr & 1);
76  eepromSize = (mode16 ? 4096 : 256);
77  trace_eeprom("Examining %d byte eeprom at location 0x%x"
78  " using %d bit addressing",eepromSize,addr,
79  mode16 ? 16 : 8);
80 
81  msg[0].addr = addr;
82  msg[0].flags = 0;
83  msg[0].len = mode16 ? 2 : 1;
84  msg[0].buf = iadd;
85  msg[1].addr = addr;
86  msg[1].flags = I2C_M_RD;
87 
88  /* We have to do the actual eeprom data fetch ourselves, because
89  (1) we're only fetching part of the eeprom, and (2) if we were
90  getting the whole thing our I2C driver can't grab it in one
91  pass - which is what tveeprom is otherwise going to attempt */
92  memset(eeprom,0,EEPROM_SIZE);
93  for (tcnt = 0; tcnt < EEPROM_SIZE; tcnt += pcnt) {
94  pcnt = 16;
95  if (pcnt + tcnt > EEPROM_SIZE) pcnt = EEPROM_SIZE-tcnt;
96  offs = tcnt + (eepromSize - EEPROM_SIZE);
97  if (mode16) {
98  iadd[0] = offs >> 8;
99  iadd[1] = offs;
100  } else {
101  iadd[0] = offs;
102  }
103  msg[1].len = pcnt;
104  msg[1].buf = eeprom+tcnt;
105  if ((ret = i2c_transfer(&hdw->i2c_adap,
106  msg,ARRAY_SIZE(msg))) != 2) {
108  "eeprom fetch set offs err=%d",ret);
109  kfree(eeprom);
110  return NULL;
111  }
112  }
113  return eeprom;
114 }
115 
116 
117 /* Directly call eeprom analysis function within tveeprom. */
119 {
120  u8 *eeprom;
121  struct tveeprom tvdata;
122 
123  memset(&tvdata,0,sizeof(tvdata));
124 
125  eeprom = pvr2_eeprom_fetch(hdw);
126  if (!eeprom) return -EINVAL;
127 
128  {
129  struct i2c_client fake_client;
130  /* Newer version expects a useless client interface */
131  fake_client.addr = hdw->eeprom_addr;
132  fake_client.adapter = &hdw->i2c_adap;
133  tveeprom_hauppauge_analog(&fake_client,&tvdata,eeprom);
134  }
135 
136  trace_eeprom("eeprom assumed v4l tveeprom module");
137  trace_eeprom("eeprom direct call results:");
138  trace_eeprom("has_radio=%d",tvdata.has_radio);
139  trace_eeprom("tuner_type=%d",tvdata.tuner_type);
140  trace_eeprom("tuner_formats=0x%x",tvdata.tuner_formats);
141  trace_eeprom("audio_processor=%d",tvdata.audio_processor);
142  trace_eeprom("model=%d",tvdata.model);
143  trace_eeprom("revision=%d",tvdata.revision);
144  trace_eeprom("serial_number=%d",tvdata.serial_number);
145  trace_eeprom("rev_str=%s",tvdata.rev_str);
146  hdw->tuner_type = tvdata.tuner_type;
147  hdw->tuner_updated = !0;
148  hdw->serial_number = tvdata.serial_number;
149  hdw->std_mask_eeprom = tvdata.tuner_formats;
150 
151  kfree(eeprom);
152 
153  return 0;
154 }
155 
156 /*
157  Stuff for Emacs to see, in order to encourage consistent editing style:
158  *** Local Variables: ***
159  *** mode: c ***
160  *** fill-column: 70 ***
161  *** tab-width: 8 ***
162  *** c-basic-offset: 8 ***
163  *** End: ***
164  */