1 /*
2  *
3  *
4  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
5  *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
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) {
58 		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
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) {
107 			pvr2_trace(PVR2_TRACE_ERROR_LEGS,
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. */
118 int pvr2_eeprom_analyze(struct pvr2_hdw *hdw)
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   */
165