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https://github.com/Telecominfraproject/OpenCellular.git
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dcb9bb6026
- Removed duplicate (similar) i2c_read_string functions. - Kept one generic (weak) copy in common/i2c.c. - TBD: Need support start/stop flags for STM32 family devices BUG=chrome-os-partner:23569 BRANCH=ToT TEST=Verified with smart battery firmware update application on glimmer. Passed LGC & Simplo Battery. Change-Id: I6d9446c60b6a36aef9a6179242c081084199c8e2 Signed-off-by: Sheng-Liang Song <ssl@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/209866 Reviewed-by: Randall Spangler <rspangler@chromium.org>
40 lines
967 B
C
40 lines
967 B
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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/* STM32 common I2C code for Chrome EC */
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#include "i2c.h"
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#include "util.h"
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/* Maximum transfer of a SMBUS block transfer */
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#define SMBUS_MAX_BLOCK 32
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int i2c_read_string(int port, int slave_addr,
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int offset, uint8_t *data, int len)
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{
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int rv;
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uint8_t reg, block_length;
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if ((len <= 0) || (len > SMBUS_MAX_BLOCK))
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return EC_ERROR_INVAL;
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i2c_lock(port, 1);
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/* Read the counted string into the output buffer */
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reg = offset;
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rv = i2c_xfer(port, slave_addr, ®, 1, data, len, I2C_XFER_SINGLE);
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if (rv == EC_SUCCESS) {
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/* Block length is the first byte of the returned buffer */
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block_length = MIN(data[0], len - 1);
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/* Move data down, then null-terminate it */
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memmove(data, data + 1, block_length);
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data[block_length] = 0;
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}
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i2c_lock(port, 0);
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return rv;
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}
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