[PATCH 17/17] Replace uses of FROM_SSI_SLAVE() macro with QOM casts

[Peter Maydell]

The FROM_SSI_SLAVE() macro predates QOM and is used as a typesafe way
to cast from an SSISlave* to the instance struct of a subtype of
TYPE_SSI_SLAVE.  Switch to using the QOM cast macros instead, which
have the same effect (by writing the QOM macros if the types were
previously missing them.)

(The FROM_SSI_SLAVE() macro allows the SSISlave member of the
subtype's struct to be anywhere as long as it is named "ssidev",
whereas a QOM cast macro insists that it is the first thing in the
subtype's struct.  This is true for all the types we convert here.)

This removes all the uses of FROM_SSI_SLAVE() so we can delete the
definition.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 include/hw/ssi/ssi.h |  2 --
 hw/arm/z2.c          | 11 +++++++----
 hw/display/ads7846.c |  9 ++++++---
 hw/display/ssd0323.c | 10 +++++++---
 hw/sd/ssi-sd.c       |  4 ++--
 5 files changed, 22 insertions(+), 14 deletions(-)

diff --git a/include/hw/ssi/ssi.h b/include/hw/ssi/ssi.h
index 5fd411f2e4e..eac168aa1db 100644
--- a/include/hw/ssi/ssi.h
+++ b/include/hw/ssi/ssi.h
@@ -66,8 +66,6 @@ struct SSISlave {
     bool cs;
 };
 
-#define FROM_SSI_SLAVE(type, dev) DO_UPCAST(type, ssidev, dev)
-
 extern const VMStateDescription vmstate_ssi_slave;
 
 #define VMSTATE_SSI_SLAVE(_field, _state) {                          \
diff --git a/hw/arm/z2.c b/hw/arm/z2.c
index a0f40959904..e1f22f58681 100644
--- a/hw/arm/z2.c
+++ b/hw/arm/z2.c
@@ -111,9 +111,12 @@ typedef struct {
     int pos;
 } ZipitLCD;
 
+#define TYPE_ZIPIT_LCD "zipit-lcd"
+#define ZIPIT_LCD(obj) OBJECT_CHECK(ZipitLCD, (obj), TYPE_ZIPIT_LCD)
+
 static uint32_t zipit_lcd_transfer(SSISlave *dev, uint32_t value)
 {
-    ZipitLCD *z = FROM_SSI_SLAVE(ZipitLCD, dev);
+    ZipitLCD *z = ZIPIT_LCD(dev);
     uint16_t val;
     if (z->selected) {
         z->buf[z->pos] = value & 0xff;
@@ -153,7 +156,7 @@ static void z2_lcd_cs(void *opaque, int line, int level)
 
 static void zipit_lcd_realize(SSISlave *dev, Error **errp)
 {
-    ZipitLCD *z = FROM_SSI_SLAVE(ZipitLCD, dev);
+    ZipitLCD *z = ZIPIT_LCD(dev);
     z->selected = 0;
     z->enabled = 0;
     z->pos = 0;
@@ -185,7 +188,7 @@ static void zipit_lcd_class_init(ObjectClass *klass, void 
*data)
 }
 
 static const TypeInfo zipit_lcd_info = {
-    .name          = "zipit-lcd",
+    .name          = TYPE_ZIPIT_LCD,
     .parent        = TYPE_SSI_SLAVE,
     .instance_size = sizeof(ZipitLCD),
     .class_init    = zipit_lcd_class_init,
@@ -325,7 +328,7 @@ static void z2_init(MachineState *machine)
 
     type_register_static(&zipit_lcd_info);
     type_register_static(&aer915_info);
-    z2_lcd = ssi_create_slave(mpu->ssp[1], "zipit-lcd");
+    z2_lcd = ssi_create_slave(mpu->ssp[1], TYPE_ZIPIT_LCD);
     bus = pxa2xx_i2c_bus(mpu->i2c[0]);
     i2c_create_slave(bus, TYPE_AER915, 0x55);
     wm = i2c_create_slave(bus, TYPE_WM8750, 0x1b);
diff --git a/hw/display/ads7846.c b/hw/display/ads7846.c
index 9228b40b1af..56bf82fe079 100644
--- a/hw/display/ads7846.c
+++ b/hw/display/ads7846.c
@@ -29,6 +29,9 @@ typedef struct {
     int output;
 } ADS7846State;
 
+#define TYPE_ADS7846 "ads7846"
+#define ADS7846(obj) OBJECT_CHECK(ADS7846State, (obj), TYPE_ADS7846)
+
 /* Control-byte bitfields */
 #define CB_PD0         (1 << 0)
 #define CB_PD1         (1 << 1)
@@ -61,7 +64,7 @@ static void ads7846_int_update(ADS7846State *s)
 
 static uint32_t ads7846_transfer(SSISlave *dev, uint32_t value)
 {
-    ADS7846State *s = FROM_SSI_SLAVE(ADS7846State, dev);
+    ADS7846State *s = ADS7846(dev);
 
     switch (s->cycle ++) {
     case 0:
@@ -139,7 +142,7 @@ static const VMStateDescription vmstate_ads7846 = {
 static void ads7846_realize(SSISlave *d, Error **errp)
 {
     DeviceState *dev = DEVICE(d);
-    ADS7846State *s = FROM_SSI_SLAVE(ADS7846State, d);
+    ADS7846State *s = ADS7846(d);
 
     qdev_init_gpio_out(dev, &s->interrupt, 1);
 
@@ -166,7 +169,7 @@ static void ads7846_class_init(ObjectClass *klass, void 
*data)
 }
 
 static const TypeInfo ads7846_info = {
-    .name          = "ads7846",
+    .name          = TYPE_ADS7846,
     .parent        = TYPE_SSI_SLAVE,
     .instance_size = sizeof(ADS7846State),
     .class_init    = ads7846_class_init,
diff --git a/hw/display/ssd0323.c b/hw/display/ssd0323.c
index c3bdb18742c..32d27f008ae 100644
--- a/hw/display/ssd0323.c
+++ b/hw/display/ssd0323.c
@@ -66,9 +66,13 @@ typedef struct {
     uint8_t framebuffer[128 * 80 / 2];
 } ssd0323_state;
 
+#define TYPE_SSD0323 "ssd0323"
+#define SSD0323(obj) OBJECT_CHECK(ssd0323_state, (obj), TYPE_SSD0323)
+
+
 static uint32_t ssd0323_transfer(SSISlave *dev, uint32_t data)
 {
-    ssd0323_state *s = FROM_SSI_SLAVE(ssd0323_state, dev);
+    ssd0323_state *s = SSD0323(dev);
 
     switch (s->mode) {
     case SSD0323_DATA:
@@ -346,7 +350,7 @@ static const GraphicHwOps ssd0323_ops = {
 static void ssd0323_realize(SSISlave *d, Error **errp)
 {
     DeviceState *dev = DEVICE(d);
-    ssd0323_state *s = FROM_SSI_SLAVE(ssd0323_state, d);
+    ssd0323_state *s = SSD0323(d);
 
     s->col_end = 63;
     s->row_end = 79;
@@ -368,7 +372,7 @@ static void ssd0323_class_init(ObjectClass *klass, void 
*data)
 }
 
 static const TypeInfo ssd0323_info = {
-    .name          = "ssd0323",
+    .name          = TYPE_SSD0323,
     .parent        = TYPE_SSI_SLAVE,
     .instance_size = sizeof(ssd0323_state),
     .class_init    = ssd0323_class_init,
diff --git a/hw/sd/ssi-sd.c b/hw/sd/ssi-sd.c
index 25cec2ddeaa..25cdf4c966d 100644
--- a/hw/sd/ssi-sd.c
+++ b/hw/sd/ssi-sd.c
@@ -74,7 +74,7 @@ typedef struct {
 
 static uint32_t ssi_sd_transfer(SSISlave *dev, uint32_t val)
 {
-    ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, dev);
+    ssi_sd_state *s = SSI_SD(dev);
 
     /* Special case: allow CMD12 (STOP TRANSMISSION) while reading data.  */
     if (s->mode == SSI_SD_DATA_READ && val == 0x4d) {
@@ -241,7 +241,7 @@ static const VMStateDescription vmstate_ssi_sd = {
 
 static void ssi_sd_realize(SSISlave *d, Error **errp)
 {
-    ssi_sd_state *s = FROM_SSI_SLAVE(ssi_sd_state, d);
+    ssi_sd_state *s = SSI_SD(d);
     DeviceState *carddev;
     DriveInfo *dinfo;
     Error *err = NULL;
-- 
2.20.1