i2c: pm_smbus: Fix the semantics of block I2C transfers

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 <cminyard@mvista.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1534796770-10295-3-git-send-email-minyard@acm.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 32 insertions, 15 deletions

diff --git a/hw/i2c/pm_smbus.c b/hw/i2c/pm_smbus.c
index 83c2377..f1fe889 100644
--- a/hw/i2c/pm_smbus.c
+++ b/hw/i2c/pm_smbus.c
@@ -117,10 +117,16 @@ 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 587ce1a..6ff77c5 100644
--- a/hw/i2c/smbus.c
+++ b/hw/i2c/smbus.c
@@ -293,33 +293,42 @@ 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;
 
@@ -330,7 +339,9 @@ 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]);
     }