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cc0843d270
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>
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* NXP PCA9534 I/O expander
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*/
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#include "i2c.h"
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#include "ioexpander_pca9534.h"
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static int pca9534_pin_read(int port, int addr, int reg, int pin, int *val)
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{
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int ret;
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ret = i2c_read8(port, addr, reg, val);
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*val = (*val & (1 << pin)) ? 1 : 0;
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return ret;
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}
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static int pca9534_pin_write(int port, int addr, int reg, int pin, int val)
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{
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int ret, v;
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ret = i2c_read8(port, addr, reg, &v);
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if (ret != EC_SUCCESS)
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return ret;
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v &= ~(1 << pin);
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if (val)
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v |= 1 << pin;
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return i2c_write8(port, addr, reg, v);
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}
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int pca9534_get_level(int port, int addr, int pin, int *level)
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{
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return pca9534_pin_read(port, addr, PCA9534_REG_INPUT, pin, level);
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}
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int pca9534_set_level(int port, int addr, int pin, int level)
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{
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return pca9534_pin_write(port, addr, PCA9534_REG_OUTPUT, pin, level);
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}
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int pca9534_config_pin(int port, int addr, int pin, int is_input)
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{
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return pca9534_pin_write(port, addr, PCA9534_REG_CONFIG, pin, is_input);
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}
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