[U-Boot] [PATCH v2 11/17] dm: i2c: Add a sandbox I2C driver

Simon Glass
2014-11-11T17:46:27Z

This driver includes some test features such as only supporting certain
bus speeds. It passes its I2C traffic through to an emulator.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

Changes in v2: None

drivers/i2c/Makefile | 2 +-
drivers/i2c/sandbox_i2c.c | 148 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 149 insertions(+), 1 deletion(-)
create mode 100644 drivers/i2c/sandbox_i2c.c

diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 4c9db51..eba3a71 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -27,7 +27,7 @@ obj-$(CONFIG_SYS_I2C_OMAP34XX) += omap24xx_i2c.o
obj-$(CONFIG_SYS_I2C_PPC4XX) += ppc4xx_i2c.o
obj-$(CONFIG_SYS_I2C_RCAR) += rcar_i2c.o
obj-$(CONFIG_SYS_I2C_S3C24X0) += s3c24x0_i2c.o
-obj-$(CONFIG_SYS_I2C_SANDBOX) += i2c-emul-uclass.o
+obj-$(CONFIG_SYS_I2C_SANDBOX) += sandbox_i2c.o i2c-emul-uclass.o
obj-$(CONFIG_SYS_I2C_SH) += sh_i2c.o
obj-$(CONFIG_SYS_I2C_SOFT) += soft_i2c.o
obj-$(CONFIG_SYS_I2C_TEGRA) += tegra_i2c.o
diff --git a/drivers/i2c/sandbox_i2c.c b/drivers/i2c/sandbox_i2c.c
new file mode 100644
index 0000000..3beb0f9
--- /dev/null
+++ b/drivers/i2c/sandbox_i2c.c
@@ -0,0 +1,148 @@
+/*
+ * Simulate an I2C port
+ *
+ * Copyright (c) 2014 Google, Inc
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <i2c.h>
+#include <dm/lists.h>
+#include <dm/device-internal.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct dm_sandbox_i2c_emul_priv {
+ struct udevice *emul;
+};
+
+static int get_emul(struct udevice *bus, uint chip_addr, struct udevice **devp,
+ struct dm_i2c_ops **opsp)
+{
+ const void *blob = gd->fdt_blob;
+ struct dm_i2c_chip *priv;
+ struct udevice *dev;
+ int ret;
+
+ ret = i2c_get_chip(bus, chip_addr, &dev);
+ if (ret)
+ return ret;
+ priv = dev_get_parentdata(dev);
+ if (!priv->emul) {
+ int node;
+
+ debug("Scanning i2c bus '%s' for devices\n", dev->name);
+ for (node = fdt_first_subnode(blob, dev->of_offset);
+ node >= 0;
+ node = fdt_next_subnode(blob, node)) {
+ int ret;
+
+ ret = lists_bind_fdt(dev, blob, node, &priv->emul);
+ if (ret)
+ return ret;
+ debug("Found emul '%s' for i2c device '%s'\n",
+ priv->emul->name, dev->name);
+ break;
+ }
+ }
+
+ if (!priv->emul)
+ return -ENODEV;
+ ret = device_probe(priv->emul);
+ if (ret)
+ return ret;
+ *devp = priv->emul;
+ *opsp = i2c_get_ops(priv->emul);
+
+ return 0;
+}
+
+static int sandbox_i2c_probe_chip(struct udevice *bus, uint chip_addr)
+{
+ struct dm_i2c_ops *ops;
+ struct udevice *emul;
+ int ret;
+
+ ret = get_emul(bus, chip_addr, &emul, &ops);
+ if (ret)
+ return ret;
+
+ return ops->probe(emul, chip_addr);
+}
+
+static int sandbox_i2c_read(struct udevice *bus, uint chip_addr, uint addr,
+ uint alen, uint8_t *buffer, int len)
+{
+ struct dm_i2c_bus *i2c = bus->uclass_priv;
+ struct dm_i2c_ops *ops;
+ struct udevice *emul;
+ int ret;
+
+ ret = get_emul(bus, chip_addr, &emul, &ops);
+ if (ret)
+ return ret;
+
+ /* For testing, don't allow reading above 400KHz */
+ if (i2c->speed_hz > 400000 || alen != 1)
+ return -EINVAL;
+ return ops->read(emul, chip_addr, addr, alen, buffer, len);
+}
+
+static int sandbox_i2c_write(struct udevice *bus, uint chip_addr, uint addr,
+ uint alen, const uint8_t *buffer, int len)
+{
+ struct dm_i2c_bus *i2c = bus->uclass_priv;
+ struct dm_i2c_ops *ops;
+ struct udevice *emul;
+ int ret;
+
+ ret = get_emul(bus, chip_addr, &emul, &ops);
+ if (ret)
+ return ret;
+
+ /* For testing, don't allow writing above 100KHz */
+ if (i2c->speed_hz > 100000 || alen != 1)
+ return -EINVAL;
+ return ops->write(emul, chip_addr, addr, alen, buffer, len);
+}
+
+static int sandbox_i2c_set_addr_len(struct udevice *dev, uint addr_len)
+{
+ if (addr_len == 3)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const struct dm_i2c_ops sandbox_i2c_ops = {
+ .probe = sandbox_i2c_probe_chip,
+ .read = sandbox_i2c_read,
+ .write = sandbox_i2c_write,
+ .set_addr_len = sandbox_i2c_set_addr_len,
+};
+
+static int sandbox_i2c_child_pre_probe(struct udevice *dev)
+{
+ struct dm_i2c_chip *i2c_chip = dev_get_parentdata(dev);
+
+ return i2c_chip_ofdata_to_platdata(gd->fdt_blob, dev->of_offset,
+ i2c_chip);
+}
+
+static const struct udevice_id sandbox_i2c_ids[] = {
+ { .compatible = "sandbox,i2c" },
+ { }
+};
+
+U_BOOT_DRIVER(i2c_sandbox) = {
+ .name = "i2c_sandbox",
+ .id = UCLASS_I2C,
+ .of_match = sandbox_i2c_ids,
+ .per_child_auto_alloc_size = sizeof(struct dm_i2c_chip),
+ .child_pre_probe = sandbox_i2c_child_pre_probe,
+ .ops = &sandbox_i2c_ops,
+};
--
2.1.0.rc2.206.gedb03e5