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. */ 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. */ 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