[PULL 10/17] hw/i2c: Enable an id for the pca954x devices

[Philippe Mathieu-Daudé]

From: Patrick Venture <venture@google.com>

This allows the devices to be more readily found and specified.
Without setting the name field, they can only be found by device type
name, which doesn't let you specify the second of the same device type
behind a bus.

Tested: Verified that by default the device was findable with the name
'pca954x[77]', for an instance attached at that address.

Signed-off-by: Patrick Venture <venture@google.com>
Reviewed-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Corey Minyard <cminyard@mvista.com>
Message-Id: <20230322172136.48010-1-venture@google.com>
[PMD: Fix typo in property name]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/i2c/i2c_mux_pca954x.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/hw/i2c/i2c_mux_pca954x.c b/hw/i2c/i2c_mux_pca954x.c
index 3945de795c..db5db956a6 100644
--- a/hw/i2c/i2c_mux_pca954x.c
+++ b/hw/i2c/i2c_mux_pca954x.c
@@ -20,6 +20,7 @@
 #include "hw/i2c/i2c_mux_pca954x.h"
 #include "hw/i2c/smbus_slave.h"
 #include "hw/qdev-core.h"
+#include "hw/qdev-properties.h"
 #include "hw/sysbus.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
@@ -43,6 +44,8 @@ typedef struct Pca954xState {
 
     bool enabled[PCA9548_CHANNEL_COUNT];
     I2CBus *bus[PCA9548_CHANNEL_COUNT];
+
+    char *name;
 } Pca954xState;
 
 /*
@@ -181,6 +184,17 @@ static void pca9548_class_init(ObjectClass *klass, void 
*data)
     s->nchans = PCA9548_CHANNEL_COUNT;
 }
 
+static void pca954x_realize(DeviceState *dev, Error **errp)
+{
+    Pca954xState *s = PCA954X(dev);
+    DeviceState *d = DEVICE(s);
+    if (s->name) {
+        d->id = g_strdup(s->name);
+    } else {
+        d->id = g_strdup_printf("pca954x[%x]", s->parent.i2c.address);
+    }
+}
+
 static void pca954x_init(Object *obj)
 {
     Pca954xState *s = PCA954X(obj);
@@ -197,6 +211,11 @@ static void pca954x_init(Object *obj)
     }
 }
 
+static Property pca954x_props[] = {
+    DEFINE_PROP_STRING("name", Pca954xState, name),
+    DEFINE_PROP_END_OF_LIST()
+};
+
 static void pca954x_class_init(ObjectClass *klass, void *data)
 {
     I2CSlaveClass *sc = I2C_SLAVE_CLASS(klass);
@@ -209,9 +228,12 @@ static void pca954x_class_init(ObjectClass *klass, void 
*data)
     rc->phases.enter = pca954x_enter_reset;
 
     dc->desc = "Pca954x i2c-mux";
+    dc->realize = pca954x_realize;
 
     k->write_data = pca954x_write_data;
     k->receive_byte = pca954x_read_byte;
+
+    device_class_set_props(dc, pca954x_props);
 }
 
 static const TypeInfo pca954x_info[] = {
-- 
2.38.1