To enable testing of I2C, add a simple I2C EEPROM simulator for sandbox.
It supports reading and writing from a small data store.
Signed-off-by: Simon Glass <s...@chromium.org>
---
Changes in v3:
- Update emulator for new uclass interface
Changes in v2: None
drivers/misc/Makefile | 3 ++
drivers/misc/i2c_eeprom_emul.c | 108 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 111 insertions(+)
create mode 100644 drivers/misc/i2c_eeprom_emul.c
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 2f2e48f..ff02184 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -20,6 +20,9 @@ obj-$(CONFIG_MXC_OCOTP) += mxc_ocotp.o
obj-$(CONFIG_MXS_OCOTP) += mxs_ocotp.o
obj-$(CONFIG_NS87308) += ns87308.o
obj-$(CONFIG_PDSP188x) += pdsp188x.o
+ifdef CONFIG_DM_I2C
+obj-$(CONFIG_SANDBOX) += i2c_eeprom_emul.o
+endif
obj-$(CONFIG_STATUS_LED) += status_led.o
obj-$(CONFIG_TWL4030_LED) += twl4030_led.o
obj-$(CONFIG_FSL_IFC) += fsl_ifc.o
diff --git a/drivers/misc/i2c_eeprom_emul.c b/drivers/misc/i2c_eeprom_emul.c
new file mode 100644
index 0000000..4cdf442
--- /dev/null
+++ b/drivers/misc/i2c_eeprom_emul.c
@@ -0,0 +1,108 @@
+/*
+ * Simulate an I2C eeprom
+ *
+ * Copyright (c) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <fdtdec.h>
+#include <i2c.h>
+#include <malloc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct sandbox_i2c_flash_plat_data {
+ const char *filename;
+ int size;
+};
+
+struct sandbox_i2c_flash {
+ uint8_t *data;
+};
+
+static int sandbox_i2c_eprom_xfer(struct udevice *emul, struct i2c_msg *msg,
+ int nmsgs)
+{
+ int offset = 0;
+
+ /* Always let probe succeed */
+ if (nmsgs == 1 && msg->len == 1) {
+ printf("%s: Detected probe\n", __func__);
+ return 0;
+ }
+
+ for (; nmsgs > 0; nmsgs--, msg++) {
+ struct sandbox_i2c_flash_plat_data *plat =
+ dev_get_platdata(emul);
+ struct sandbox_i2c_flash *priv = dev_get_priv(emul);
+
+ if (!plat->size)
+ return -ENODEV;
+ if (msg->addr + msg->len > plat->size) {
+ debug("%s: Address %x, len %x is outside range 0..%x\n",
+ __func__, msg->addr, msg->len, plat->size);
+ return -EINVAL;
+ }
+ if (msg->flags & I2C_M_RD) {
+ memcpy(msg->buf, priv->data + offset, msg->len);
+ } else {
+ offset = *msg->buf;
+ memcpy(priv->data + offset, msg->buf + 1,
+ msg->len - 1);
+ }
+ }
+
+ return 0;
+}
+
+struct dm_i2c_ops sandbox_i2c_emul_ops = {
+ .xfer = sandbox_i2c_eprom_xfer,
+};
+
+static int sandbox_i2c_eeprom_ofdata_to_platdata(struct udevice *dev)
+{
+ struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev);
+
+ plat->size = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+ "sandbox,size", 32);
+ plat->filename = fdt_getprop(gd->fdt_blob, dev->of_offset,
+ "sandbox,filename", NULL);
+ if (!plat->filename) {
+ debug("%s: No filename for device '%s'\n", __func__,
+ dev->name);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int sandbox_i2c_eeprom_probe(struct udevice *dev)
+{
+ struct sandbox_i2c_flash_plat_data *plat = dev_get_platdata(dev);
+ struct sandbox_i2c_flash *priv = dev_get_priv(dev);
+
+ priv->data = calloc(1, plat->size);
+ if (!priv->data)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static const struct udevice_id sandbox_i2c_ids[] = {
+ { .compatible = "sandbox,i2c-eeprom" },
+ { }
+};
+
+U_BOOT_DRIVER(sandbox_i2c_emul) = {
+ .name = "sandbox_i2c_eeprom_emul",
+ .id = UCLASS_I2C_EMUL,
+ .of_match = sandbox_i2c_ids,
+ .ofdata_to_platdata = sandbox_i2c_eeprom_ofdata_to_platdata,
+ .probe = sandbox_i2c_eeprom_probe,
+ .priv_auto_alloc_size = sizeof(struct sandbox_i2c_flash),
+ .platdata_auto_alloc_size = sizeof(struct sandbox_i2c_flash_plat_data),
+ .ops = &sandbox_i2c_emul_ops,
+};
--
2.1.0.rc2.206.gedb03e5
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