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Diffstat (limited to 'drivers/i2c/cros_ec_ldo.c')
-rw-r--r--drivers/i2c/cros_ec_ldo.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/i2c/cros_ec_ldo.c b/drivers/i2c/cros_ec_ldo.c
new file mode 100644
index 0000000000..b817c61f1c
--- /dev/null
+++ b/drivers/i2c/cros_ec_ldo.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <cros_ec.h>
+#include <errno.h>
+#include <i2c.h>
+#include <power/tps65090.h>
+
+static int cros_ec_ldo_set_bus_speed(struct udevice *dev, unsigned int speed)
+{
+ return 0;
+}
+
+static int cros_ec_ldo_xfer(struct udevice *dev, struct i2c_msg *msg,
+ int nmsgs)
+{
+ bool is_read = nmsgs > 1;
+ int fet_id, ret;
+
+ /*
+ * Look for reads and writes of the LDO registers. In either case the
+ * first message is a write with the register number as the first byte.
+ */
+ if (!nmsgs || !msg->len || (msg->flags & I2C_M_RD)) {
+ debug("%s: Invalid message\n", __func__);
+ goto err;
+ }
+
+ fet_id = msg->buf[0] - REG_FET_BASE;
+ if (fet_id < 1 || fet_id > MAX_FET_NUM) {
+ debug("%s: Invalid FET %d\n", __func__, fet_id);
+ goto err;
+ }
+
+ if (is_read) {
+ uint8_t state;
+
+ ret = cros_ec_get_ldo(dev->parent, fet_id, &state);
+ if (!ret)
+ msg[1].buf[0] = state ?
+ FET_CTRL_ENFET | FET_CTRL_PGFET : 0;
+ } else {
+ bool on = msg->buf[1] & FET_CTRL_ENFET;
+
+ ret = cros_ec_set_ldo(dev->parent, fet_id, on);
+ }
+
+ return ret;
+
+err:
+ /* Indicate that the message is unimplemented */
+ return -ENOSYS;
+}
+
+static const struct dm_i2c_ops cros_ec_i2c_ops = {
+ .xfer = cros_ec_ldo_xfer,
+ .set_bus_speed = cros_ec_ldo_set_bus_speed,
+};
+
+static const struct udevice_id cros_ec_i2c_ids[] = {
+ { .compatible = "google,cros-ec-ldo-tunnel" },
+ { }
+};
+
+U_BOOT_DRIVER(cros_ec_ldo) = {
+ .name = "cros_ec_ldo_tunnel",
+ .id = UCLASS_I2C,
+ .of_match = cros_ec_i2c_ids,
+ .per_child_auto_alloc_size = sizeof(struct dm_i2c_chip),
+ .ops = &cros_ec_i2c_ops,
+};
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