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@@ -6,8 +6,85 @@
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#include <common.h>
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#include <dm.h>
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#include <i2c.h>
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+#include <dm/device-internal.h>
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+#include <dm/uclass-internal.h>
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+
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+/*
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+ * i2c emulation works using an 'emul' node at the bus level. Each device in
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+ * that node is in the UCLASS_I2C_EMUL uclass, and emulates one i2c device. A
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+ * pointer to the device it emulates is in the 'dev' property of the emul device
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+ * uclass platdata (struct i2c_emul_platdata), put there by i2c_emul_find().
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+ * When sandbox wants an emulator for a device, it calls i2c_emul_find() which
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+ * searches for the emulator with the correct address. To find the device for an
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+ * emulator, call i2c_emul_get_device().
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+ *
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+ * The 'emul' node is in the UCLASS_I2C_EMUL_PARENT uclass. We use a separate
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+ * uclass so avoid having strange devices on the I2C bus.
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+ */
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+
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+/**
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+ * struct i2c_emul_uc_platdata - information about the emulator for this device
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+ *
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+ * This is used by devices in UCLASS_I2C_EMUL to record information about the
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+ * device being emulated. It is accessible with dev_get_uclass_platdata()
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+ *
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+ * @dev: Device being emulated
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+ */
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+struct i2c_emul_uc_platdata {
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+ struct udevice *dev;
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+};
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+
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+struct udevice *i2c_emul_get_device(struct udevice *emul)
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+{
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+ struct i2c_emul_uc_platdata *uc_plat = dev_get_uclass_platdata(emul);
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+
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+ return uc_plat->dev;
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+}
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+
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+int i2c_emul_find(struct udevice *dev, struct udevice **emulp)
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+{
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+ struct i2c_emul_uc_platdata *uc_plat;
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+ struct udevice *emul;
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+ int ret;
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+
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+ ret = uclass_find_device_by_phandle(UCLASS_I2C_EMUL, dev,
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+ "sandbox,emul", &emul);
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+ if (ret) {
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+ log_err("No emulators for device '%s'\n", dev->name);
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+ return ret;
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+ }
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+ uc_plat = dev_get_uclass_platdata(emul);
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+ uc_plat->dev = dev;
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+ *emulp = emul;
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+
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+ return device_probe(emul);
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+}
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UCLASS_DRIVER(i2c_emul) = {
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.id = UCLASS_I2C_EMUL,
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.name = "i2c_emul",
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+ .per_device_platdata_auto_alloc_size =
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+ sizeof(struct i2c_emul_uc_platdata),
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+};
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+
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+/*
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+ * This uclass is a child of the i2c bus. Its platdata is not defined here so
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+ * is defined by its parent, UCLASS_I2C, which uses struct dm_i2c_chip. See
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+ * per_child_platdata_auto_alloc_size in UCLASS_DRIVER(i2c).
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+ */
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+UCLASS_DRIVER(i2c_emul_parent) = {
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+ .id = UCLASS_I2C_EMUL_PARENT,
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+ .name = "i2c_emul_parent",
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+ .post_bind = dm_scan_fdt_dev,
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+};
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+
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+static const struct udevice_id i2c_emul_parent_ids[] = {
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+ { .compatible = "sandbox,i2c-emul-parent" },
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+ { }
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+};
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+
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+U_BOOT_DRIVER(i2c_emul_parent_drv) = {
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+ .name = "i2c_emul_parent_drv",
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+ .id = UCLASS_I2C_EMUL_PARENT,
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+ .of_match = i2c_emul_parent_ids,
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};
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