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X-Received-From: 2607:f8b0:400e:c05::242 Subject: [Qemu-devel] [PATCH 02/14] i2c:pm_smbus: Fix the semantics of block I2C transfers X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Corey Minyard , Paolo Bonzini , "Michael S . Tsirkin" Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" From: Corey Minyard The I2C block transfer commands was not implemented correctly, it read a length byte and such like it was an smbus transfer. So fix the smbus_read_block() and smbus_write_block() functions so they can properly handle I2C transfers, and normal SMBus transfers (for upcoming changes). Pass in a transfer size and a bool to know whether to use the size byte (like SMBus) or use the length given (like I2C). Signed-off-by: Corey Minyard Cc: Michael S. Tsirkin Cc: Paolo Bonzini --- hw/i2c/pm_smbus.c | 10 ++++++++-- hw/i2c/smbus.c | 37 ++++++++++++++++++++++++------------- include/hw/i2c/smbus.h | 17 +++++++++++++++-- 3 files changed, 47 insertions(+), 17 deletions(-) -- 2.7.4 diff --git a/hw/i2c/pm_smbus.c b/hw/i2c/pm_smbus.c index 92c3aebd..679edbc 100644 --- a/hw/i2c/pm_smbus.c +++ b/hw/i2c/pm_smbus.c @@ -115,10 +115,16 @@ static void smb_transaction(PMSMBus *s) break; case PROT_I2C_BLOCK_DATA: if (read) { - ret = smbus_read_block(bus, addr, cmd, s->smb_data); + int xfersize = s->smb_data0; + if (xfersize > sizeof(s->smb_data)) { + xfersize = sizeof(s->smb_data); + } + ret = smbus_read_block(bus, addr, s->smb_data1, s->smb_data, + xfersize, false, true); goto data8; } else { - ret = smbus_write_block(bus, addr, cmd, s->smb_data, s->smb_data0); + ret = smbus_write_block(bus, addr, cmd, s->smb_data, s->smb_data0, + false); goto done; } break; diff --git a/hw/i2c/smbus.c b/hw/i2c/smbus.c index 2d1b79a..4b0e264 100644 --- a/hw/i2c/smbus.c +++ b/hw/i2c/smbus.c @@ -301,33 +301,42 @@ int smbus_write_word(I2CBus *bus, uint8_t addr, uint8_t command, uint16_t data) return 0; } -int smbus_read_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data) +int smbus_read_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data, + int len, bool recv_len, bool send_cmd) { - int len; + int rlen; int i; - if (i2c_start_transfer(bus, addr, 0)) { - return -1; + if (send_cmd) { + if (i2c_start_transfer(bus, addr, 0)) { + return -1; + } + i2c_send(bus, command); } - i2c_send(bus, command); if (i2c_start_transfer(bus, addr, 1)) { - i2c_end_transfer(bus); + if (send_cmd) { + i2c_end_transfer(bus); + } return -1; } - len = i2c_recv(bus); - if (len > 32) { - len = 0; + if (recv_len) { + rlen = i2c_recv(bus); + } else { + rlen = len; } - for (i = 0; i < len; i++) { + if (rlen > len) { + rlen = 0; + } + for (i = 0; i < rlen; i++) { data[i] = i2c_recv(bus); } i2c_nack(bus); i2c_end_transfer(bus); - return len; + return rlen; } int smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data, - int len) + int len, bool send_len) { int i; @@ -338,7 +347,9 @@ int smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data, return -1; } i2c_send(bus, command); - i2c_send(bus, len); + if (send_len) { + i2c_send(bus, len); + } for (i = 0; i < len; i++) { i2c_send(bus, data[i]); } diff --git a/include/hw/i2c/smbus.h b/include/hw/i2c/smbus.h index 544bbc1..f1b8078 100644 --- a/include/hw/i2c/smbus.h +++ b/include/hw/i2c/smbus.h @@ -73,9 +73,22 @@ int smbus_read_byte(I2CBus *bus, uint8_t addr, uint8_t command); int smbus_write_byte(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t data); int smbus_read_word(I2CBus *bus, uint8_t addr, uint8_t command); int smbus_write_word(I2CBus *bus, uint8_t addr, uint8_t command, uint16_t data); -int smbus_read_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data); + +/* + * Do a block transfer from an I2C device. If recv_len is set, then the + * first received byte is a length field and is used to know how much data + * to receive. Otherwise receive "len" bytes. If send_cmd is set, send + * the command byte first before receiving the data. + */ +int smbus_read_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data, + int len, bool recv_len, bool send_cmd); + +/* + * Do a block transfer to an I2C device. If send_len is set, send the + * "len" value before the data. + */ int smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data, - int len); + int len, bool send_len); void smbus_eeprom_init(I2CBus *smbus, int nb_eeprom, const uint8_t *eeprom_spd, int size);