1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *
4  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
5  *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
6  */
7 
8 #include <linux/slab.h>
9 #include "pvrusb2-eeprom.h"
10 #include "pvrusb2-hdw-internal.h"
11 #include "pvrusb2-debug.h"
12 
13 #define trace_eeprom(...) pvr2_trace(PVR2_TRACE_EEPROM,__VA_ARGS__)
14 
15 
16 
17 /*
18 
19    Read and analyze data in the eeprom.  Use tveeprom to figure out
20    the packet structure, since this is another Hauppauge device and
21    internally it has a family resemblance to ivtv-type devices
22 
23 */
24 
25 #include <media/tveeprom.h>
26 
27 /* We seem to only be interested in the last 128 bytes of the EEPROM */
28 #define EEPROM_SIZE 128
29 
30 /* Grab EEPROM contents, needed for direct method. */
pvr2_eeprom_fetch(struct pvr2_hdw * hdw)31 static u8 *pvr2_eeprom_fetch(struct pvr2_hdw *hdw)
32 {
33 	struct i2c_msg msg[2];
34 	u8 *eeprom;
35 	u8 iadd[2];
36 	u8 addr;
37 	u16 eepromSize;
38 	unsigned int offs;
39 	int ret;
40 	int mode16 = 0;
41 	unsigned pcnt,tcnt;
42 	eeprom = kzalloc(EEPROM_SIZE, GFP_KERNEL);
43 	if (!eeprom) {
44 		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
45 			   "Failed to allocate memory required to read eeprom");
46 		return NULL;
47 	}
48 
49 	trace_eeprom("Value for eeprom addr from controller was 0x%x",
50 		     hdw->eeprom_addr);
51 	addr = hdw->eeprom_addr;
52 	/* Seems that if the high bit is set, then the *real* eeprom
53 	   address is shifted right now bit position (noticed this in
54 	   newer PVR USB2 hardware) */
55 	if (addr & 0x80) addr >>= 1;
56 
57 	/* FX2 documentation states that a 16bit-addressed eeprom is
58 	   expected if the I2C address is an odd number (yeah, this is
59 	   strange but it's what they do) */
60 	mode16 = (addr & 1);
61 	eepromSize = (mode16 ? 4096 : 256);
62 	trace_eeprom("Examining %d byte eeprom at location 0x%x using %d bit addressing",
63 		     eepromSize, addr,
64 		     mode16 ? 16 : 8);
65 
66 	msg[0].addr = addr;
67 	msg[0].flags = 0;
68 	msg[0].len = mode16 ? 2 : 1;
69 	msg[0].buf = iadd;
70 	msg[1].addr = addr;
71 	msg[1].flags = I2C_M_RD;
72 
73 	/* We have to do the actual eeprom data fetch ourselves, because
74 	   (1) we're only fetching part of the eeprom, and (2) if we were
75 	   getting the whole thing our I2C driver can't grab it in one
76 	   pass - which is what tveeprom is otherwise going to attempt */
77 	for (tcnt = 0; tcnt < EEPROM_SIZE; tcnt += pcnt) {
78 		pcnt = 16;
79 		if (pcnt + tcnt > EEPROM_SIZE) pcnt = EEPROM_SIZE-tcnt;
80 		offs = tcnt + (eepromSize - EEPROM_SIZE);
81 		if (mode16) {
82 			iadd[0] = offs >> 8;
83 			iadd[1] = offs;
84 		} else {
85 			iadd[0] = offs;
86 		}
87 		msg[1].len = pcnt;
88 		msg[1].buf = eeprom+tcnt;
89 		if ((ret = i2c_transfer(&hdw->i2c_adap,
90 					msg,ARRAY_SIZE(msg))) != 2) {
91 			pvr2_trace(PVR2_TRACE_ERROR_LEGS,
92 				   "eeprom fetch set offs err=%d",ret);
93 			kfree(eeprom);
94 			return NULL;
95 		}
96 	}
97 	return eeprom;
98 }
99 
100 
101 /* Directly call eeprom analysis function within tveeprom. */
pvr2_eeprom_analyze(struct pvr2_hdw * hdw)102 int pvr2_eeprom_analyze(struct pvr2_hdw *hdw)
103 {
104 	u8 *eeprom;
105 	struct tveeprom tvdata;
106 
107 	memset(&tvdata,0,sizeof(tvdata));
108 
109 	eeprom = pvr2_eeprom_fetch(hdw);
110 	if (!eeprom)
111 		return -EINVAL;
112 
113 	tveeprom_hauppauge_analog(&tvdata, eeprom);
114 
115 	trace_eeprom("eeprom assumed v4l tveeprom module");
116 	trace_eeprom("eeprom direct call results:");
117 	trace_eeprom("has_radio=%d",tvdata.has_radio);
118 	trace_eeprom("tuner_type=%d",tvdata.tuner_type);
119 	trace_eeprom("tuner_formats=0x%x",tvdata.tuner_formats);
120 	trace_eeprom("audio_processor=%d",tvdata.audio_processor);
121 	trace_eeprom("model=%d",tvdata.model);
122 	trace_eeprom("revision=%d",tvdata.revision);
123 	trace_eeprom("serial_number=%d",tvdata.serial_number);
124 	trace_eeprom("rev_str=%s",tvdata.rev_str);
125 	hdw->tuner_type = tvdata.tuner_type;
126 	hdw->tuner_updated = !0;
127 	hdw->serial_number = tvdata.serial_number;
128 	hdw->std_mask_eeprom = tvdata.tuner_formats;
129 
130 	kfree(eeprom);
131 
132 	return 0;
133 }
134