libqos: split I2CAdapter initialization and allocation

Provide *_init functions that populate an I2CAdapter struct without
allocating one, and make the existing *_create functions wrap them.

Because in the new setup *_create might return a pointer inside the
IMXI2C or OMAPI2C struct, create companion *_free functions to go
back to the outer pointer.

All this is temporary until allocation will be handled entirely by
qgraph.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

3 files changed, 61 insertions, 28 deletions

diff --git a/tests/libqos/i2c-imx.c b/tests/libqos/i2c-imx.c
index 0945f2ecdc..28289c521a 100644
--- a/tests/libqos/i2c-imx.c
+++ b/tests/libqos/i2c-imx.c
@@ -30,13 +30,6 @@ enum IMXI2CDirection {
     IMX_I2C_WRITE,
 };
 
-typedef struct IMXI2C {
-    I2CAdapter parent;
-
-    uint64_t addr;
-} IMXI2C;
-
-
 static void imx_i2c_set_slave_addr(IMXI2C *s, uint8_t addr,
                                    enum IMXI2CDirection direction)
 {
@@ -47,7 +40,7 @@ static void imx_i2c_set_slave_addr(IMXI2C *s, uint8_t addr,
 static void imx_i2c_send(I2CAdapter *i2c, uint8_t addr,
                          const uint8_t *buf, uint16_t len)
 {
-    IMXI2C *s = (IMXI2C *)i2c;
+    IMXI2C *s = container_of(i2c, IMXI2C, parent);
     uint8_t data;
     uint8_t status;
     uint16_t size = 0;
@@ -107,7 +100,7 @@ static void imx_i2c_send(I2CAdapter *i2c, uint8_t addr,
 static void imx_i2c_recv(I2CAdapter *i2c, uint8_t addr,
                          uint8_t *buf, uint16_t len)
 {
-    IMXI2C *s = (IMXI2C *)i2c;
+    IMXI2C *s = container_of(i2c, IMXI2C, parent);
     uint8_t data;
     uint8_t status;
     uint16_t size = 0;
@@ -193,16 +186,30 @@ static void imx_i2c_recv(I2CAdapter *i2c, uint8_t addr,
     g_assert((status & I2SR_IBB) == 0);
 }
 
+void imx_i2c_init(IMXI2C *s, QTestState *qts, uint64_t addr)
+{
+    s->addr = addr;
+
+    s->parent.send = imx_i2c_send;
+    s->parent.recv = imx_i2c_recv;
+    s->parent.qts = qts;
+}
+
 I2CAdapter *imx_i2c_create(QTestState *qts, uint64_t addr)
 {
     IMXI2C *s = g_malloc0(sizeof(*s));
-    I2CAdapter *i2c = (I2CAdapter *)s;
 
-    s->addr = addr;
+    imx_i2c_init(s, qts, addr);
+    return &s->parent;
+}
 
-    i2c->send = imx_i2c_send;
-    i2c->recv = imx_i2c_recv;
-    i2c->qts = qts;
+void imx_i2c_free(I2CAdapter *i2c)
+{
+    IMXI2C *s;
 
-    return i2c;
+    if (!i2c) {
+        return;
+    }
+    s = container_of(i2c, IMXI2C, parent);
+    g_free(s);
 }
diff --git a/tests/libqos/i2c-omap.c b/tests/libqos/i2c-omap.c
index bb65336832..c7cbb9ecdd 100644
--- a/tests/libqos/i2c-omap.c
+++ b/tests/libqos/i2c-omap.c
@@ -40,12 +40,6 @@ enum OMAPI2CCONBits {
     OMAP_I2C_CON_I2C_EN = 1 << 15,
 };
 
-typedef struct OMAPI2C {
-    I2CAdapter parent;
-
-    uint64_t addr;
-} OMAPI2C;
-
 
 static void omap_i2c_set_slave_addr(OMAPI2C *s, uint8_t addr)
 {
@@ -59,7 +53,7 @@ static void omap_i2c_set_slave_addr(OMAPI2C *s, uint8_t addr)
 static void omap_i2c_send(I2CAdapter *i2c, uint8_t addr,
                           const uint8_t *buf, uint16_t len)
 {
-    OMAPI2C *s = (OMAPI2C *)i2c;
+    OMAPI2C *s = container_of(i2c, OMAPI2C, parent);
     uint16_t data;
 
     omap_i2c_set_slave_addr(s, addr);
@@ -103,7 +97,7 @@ static void omap_i2c_send(I2CAdapter *i2c, uint8_t addr,
 static void omap_i2c_recv(I2CAdapter *i2c, uint8_t addr,
                           uint8_t *buf, uint16_t len)
 {
-    OMAPI2C *s = (OMAPI2C *)i2c;
+    OMAPI2C *s = container_of(i2c, OMAPI2C, parent);
     uint16_t data, stat;
     uint16_t orig_len = len;
 
@@ -161,9 +155,8 @@ static void omap_i2c_recv(I2CAdapter *i2c, uint8_t addr,
     g_assert((data & OMAP_I2C_CON_STP) == 0);
 }
 
-I2CAdapter *omap_i2c_create(QTestState *qts, uint64_t addr)
+void omap_i2c_init(OMAPI2C *s, QTestState *qts, uint64_t addr)
 {
-    OMAPI2C *s = g_malloc0(sizeof(*s));
     I2CAdapter *i2c = (I2CAdapter *)s;
     uint16_t data;
 
@@ -176,6 +169,23 @@ I2CAdapter *omap_i2c_create(QTestState *qts, uint64_t addr)
     /* verify the mmio address by looking for a known signature */
     data = qtest_readw(qts, addr + OMAP_I2C_REV);
     g_assert_cmphex(data, ==, 0x34);
+}
+
+I2CAdapter *omap_i2c_create(QTestState *qts, uint64_t addr)
+{
+    OMAPI2C *s = g_malloc0(sizeof(*s));
+
+    omap_i2c_init(s, qts, addr);
+    return &s->parent;
+}
 
-    return i2c;
+void omap_i2c_free(I2CAdapter *i2c)
+{
+    OMAPI2C *s;
+
+    if (!i2c) {
+        return;
+    }
+    s = container_of(i2c, OMAPI2C, parent);
+    g_free(s);
 }
diff --git a/tests/libqos/i2c.h b/tests/libqos/i2c.h
index a462114597..877d2ab0e8 100644
--- a/tests/libqos/i2c.h
+++ b/tests/libqos/i2c.h
@@ -39,10 +39,26 @@ void i2c_set8(I2CAdapter *i2c, uint8_t addr, uint8_t reg,
 void i2c_set16(I2CAdapter *i2c, uint8_t addr, uint8_t reg,
                uint16_t value);
 
-/* libi2c-omap.c */
+/* i2c-omap.c */
+typedef struct OMAPI2C {
+    I2CAdapter parent;
+
+    uint64_t addr;
+} OMAPI2C;
+
+void omap_i2c_init(OMAPI2C *s, QTestState *qts, uint64_t addr);
 I2CAdapter *omap_i2c_create(QTestState *qts, uint64_t addr);
+void omap_i2c_free(I2CAdapter *i2c);
+
+/* i2c-imx.c */
+typedef struct IMXI2C {
+    I2CAdapter parent;
+
+    uint64_t addr;
+} IMXI2C;
 
-/* libi2c-imx.c */
+void imx_i2c_init(IMXI2C *s, QTestState *qts, uint64_t addr);
 I2CAdapter *imx_i2c_create(QTestState *qts, uint64_t addr);
+void imx_i2c_free(I2CAdapter *i2c);
 
 #endif