Plankton: Add console command to reset USB hub

This command resets the USB hub through the IO expander.

BUG=None
TEST=Reset the hub on Plankton.
BRANCH=None

Change-Id: Ia77a1e326adc6aba65438534158a4c461479727a
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/218758
Reviewed-by: Alec Berg <alecaberg@chromium.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/driver/ioexpander_pca9534.c b/driver/ioexpander_pca9534.c
new file mode 100644
index 0000000000..1ac9a5164b
--- /dev/null
+++ b/driver/ioexpander_pca9534.c
@@ -0,0 +1,44 @@
+/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * NXP PCA9534 I/O expander
+ */
+
+#include "i2c.h"
+#include "ioexpander_pca9534.h"
+
+static int pca9534_pin_read(int port, int addr, int reg, int pin, int *val)
+{
+	int ret;
+	ret = i2c_read8(port, addr, reg, val);
+	*val = (*val & (1 << pin)) ? 1 : 0;
+	return ret;
+}
+
+static int pca9534_pin_write(int port, int addr, int reg, int pin, int val)
+{
+	int ret, v;
+	ret = i2c_read8(port, addr, reg, &v);
+	if (ret != EC_SUCCESS)
+		return ret;
+	v &= ~(1 << pin);
+	if (val)
+		v |= 1 << pin;
+	return i2c_write8(port, addr, reg, v);
+}
+
+int pca9534_get_level(int port, int addr, int pin, int *level)
+{
+	return pca9534_pin_read(port, addr, PCA9534_REG_INPUT, pin, level);
+}
+
+int pca9534_set_level(int port, int addr, int pin, int level)
+{
+	return pca9534_pin_write(port, addr, PCA9534_REG_OUTPUT, pin, level);
+}
+
+int pca9534_config_pin(int port, int addr, int pin, int is_input)
+{
+	return pca9534_pin_write(port, addr, PCA9534_REG_CONFIG, pin, is_input);
+}