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![Randall Spangler](/assets/img/avatar_default.png)
Version 1 protocols (without command version) were already no longer supported in cros_ec.c. This removes some dead code from the cros_ec_i2c driver. Version 2 protcols (with command version) are now called protocol_version=2, instead of cmd_version_is_supported=1. A subsequent change will introduce protocol version 3 for SPI. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Randall Spangler <rspangler@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org>
177 lines
4.2 KiB
C
177 lines
4.2 KiB
C
/*
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* Chromium OS cros_ec driver - I2C interface
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*
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* Copyright (c) 2012 The Chromium OS Authors.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* The Matrix Keyboard Protocol driver handles talking to the keyboard
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* controller chip. Mostly this is for keyboard functions, but some other
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* things have slipped in, so we provide generic services to talk to the
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* KBC.
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*/
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#include <common.h>
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#include <i2c.h>
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#include <cros_ec.h>
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#ifdef DEBUG_TRACE
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#define debug_trace(fmt, b...) debug(fmt, #b)
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#else
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#define debug_trace(fmt, b...)
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#endif
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int cros_ec_i2c_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version,
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const uint8_t *dout, int dout_len,
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uint8_t **dinp, int din_len)
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{
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int old_bus = 0;
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/* version8, cmd8, arglen8, out8[dout_len], csum8 */
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int out_bytes = dout_len + 4;
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/* response8, arglen8, in8[din_len], checksum8 */
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int in_bytes = din_len + 3;
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uint8_t *ptr;
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/* Receive input data, so that args will be dword aligned */
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uint8_t *in_ptr;
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int len, csum, ret;
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old_bus = i2c_get_bus_num();
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/*
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* Sanity-check I/O sizes given transaction overhead in internal
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* buffers.
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*/
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if (out_bytes > sizeof(dev->dout)) {
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debug("%s: Cannot send %d bytes\n", __func__, dout_len);
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return -1;
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}
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if (in_bytes > sizeof(dev->din)) {
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debug("%s: Cannot receive %d bytes\n", __func__, din_len);
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return -1;
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}
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assert(dout_len >= 0);
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assert(dinp);
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/*
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* Copy command and data into output buffer so we can do a single I2C
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* burst transaction.
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*/
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ptr = dev->dout;
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/*
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* in_ptr starts of pointing to a dword-aligned input data buffer.
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* We decrement it back by the number of header bytes we expect to
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* receive, so that the first parameter of the resulting input data
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* will be dword aligned.
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*/
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in_ptr = dev->din + sizeof(int64_t);
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if (dev->protocol_version != 2) {
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/* Something we don't support */
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debug("%s: Protocol version %d unsupported\n",
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__func__, dev->protocol_version);
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return -1;
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}
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*ptr++ = EC_CMD_VERSION0 + cmd_version;
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*ptr++ = cmd;
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*ptr++ = dout_len;
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in_ptr -= 2; /* Expect status, length bytes */
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memcpy(ptr, dout, dout_len);
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ptr += dout_len;
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*ptr++ = (uint8_t)
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cros_ec_calc_checksum(dev->dout, dout_len + 3);
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/* Set to the proper i2c bus */
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if (i2c_set_bus_num(dev->bus_num)) {
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debug("%s: Cannot change to I2C bus %d\n", __func__,
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dev->bus_num);
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return -1;
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}
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/* Send output data */
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cros_ec_dump_data("out", -1, dev->dout, out_bytes);
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ret = i2c_write(dev->addr, 0, 0, dev->dout, out_bytes);
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if (ret) {
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debug("%s: Cannot complete I2C write to 0x%x\n",
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__func__, dev->addr);
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ret = -1;
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}
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if (!ret) {
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ret = i2c_read(dev->addr, 0, 0, in_ptr, in_bytes);
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if (ret) {
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debug("%s: Cannot complete I2C read from 0x%x\n",
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__func__, dev->addr);
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ret = -1;
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}
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}
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/* Return to original bus number */
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i2c_set_bus_num(old_bus);
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if (ret)
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return ret;
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if (*in_ptr != EC_RES_SUCCESS) {
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debug("%s: Received bad result code %d\n", __func__, *in_ptr);
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return -(int)*in_ptr;
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}
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len = in_ptr[1];
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if (len + 3 > sizeof(dev->din)) {
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debug("%s: Received length %#02x too large\n",
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__func__, len);
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return -1;
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}
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csum = cros_ec_calc_checksum(in_ptr, 2 + len);
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if (csum != in_ptr[2 + len]) {
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debug("%s: Invalid checksum rx %#02x, calced %#02x\n",
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__func__, in_ptr[2 + din_len], csum);
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return -1;
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}
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din_len = min(din_len, len);
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cros_ec_dump_data("in", -1, in_ptr, din_len + 3);
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/* Return pointer to dword-aligned input data, if any */
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*dinp = dev->din + sizeof(int64_t);
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return din_len;
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}
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int cros_ec_i2c_decode_fdt(struct cros_ec_dev *dev, const void *blob)
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{
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/* Decode interface-specific FDT params */
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dev->max_frequency = fdtdec_get_int(blob, dev->node,
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"i2c-max-frequency", 100000);
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dev->bus_num = i2c_get_bus_num_fdt(dev->parent_node);
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if (dev->bus_num == -1) {
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debug("%s: Failed to read bus number\n", __func__);
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return -1;
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}
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dev->addr = fdtdec_get_int(blob, dev->node, "reg", -1);
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if (dev->addr == -1) {
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debug("%s: Failed to read device address\n", __func__);
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return -1;
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}
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return 0;
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}
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/**
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* Initialize I2C protocol.
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*
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* @param dev CROS_EC device
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* @param blob Device tree blob
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* @return 0 if ok, -1 on error
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*/
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int cros_ec_i2c_init(struct cros_ec_dev *dev, const void *blob)
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{
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i2c_init(dev->max_frequency, dev->addr);
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return 0;
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}
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