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ea32f132f7
The two I2C commands for battery cut-off must be sent out back to back. Thus we need to guard them with I2C port lock to prevent being preempted. BUG=chrome-os-partner:19901 TEST=Check battery cutoff still works. BRANCH=spring Change-Id: Iac51037432b108d4cac29d5c73cafa9ce2310b12 Signed-off-by: Vic Yang <victoryang@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/57598 Reviewed-by: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org>
38 lines
961 B
C
38 lines
961 B
C
/* Copyright (c) 2013 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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* Smart battery driver for Spring.
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*/
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#include "host_command.h"
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#include "i2c.h"
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#include "smart_battery.h"
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#include "util.h"
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#define PARAM_CUT_OFF_LOW 0x10
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#define PARAM_CUT_OFF_HIGH 0x00
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int battery_command_cut_off(struct host_cmd_handler_args *args)
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{
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int rv;
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uint8_t buf[3];
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buf[0] = SB_MANUFACTURER_ACCESS & 0xff;
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buf[1] = PARAM_CUT_OFF_LOW;
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buf[2] = PARAM_CUT_OFF_HIGH;
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i2c_lock(I2C_PORT_BATTERY, 1);
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rv = i2c_xfer(I2C_PORT_BATTERY, BATTERY_ADDR, buf, 3, NULL, 0,
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I2C_XFER_SINGLE);
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rv = i2c_xfer(I2C_PORT_BATTERY, BATTERY_ADDR, buf, 3, NULL, 0,
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I2C_XFER_SINGLE);
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i2c_lock(I2C_PORT_BATTERY, 0);
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if (rv)
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return EC_RES_ERROR;
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return EC_RES_SUCCESS;
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}
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DECLARE_HOST_COMMAND(EC_CMD_BATTERY_CUT_OFF, battery_command_cut_off,
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EC_VER_MASK(0));
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