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. */
45static 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. */
118int 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