124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
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/* Copyright 2019 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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* MAX6958/MAX6959 7-Segment LED Display Driver
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*/
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#include "common.h"
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#include "console.h"
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#include "display_7seg.h"
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#include "hooks.h"
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#include "i2c.h"
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#include "max695x.h"
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#include "util.h"
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#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ## args)
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static inline int max695x_i2c_write8(uint8_t offset, uint8_t data)
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{
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return i2c_write8(I2C_PORT_PORT80, PORT80_I2C_ADDR,
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offset, (int)data);
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}
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static inline int max695x_i2c_write(uint8_t offset, uint8_t *data, int len)
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{
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/*
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* The address pointer stored in the MAX695x increments after
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* each data byte is written unless the address equals 01111111
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*/
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return i2c_write_block(I2C_PORT_PORT80, PORT80_I2C_ADDR,
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offset, data, len);
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}
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int display_7seg_write(enum seven_seg_module_display module, uint16_t data)
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{
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uint8_t buf[4];
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/*
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* Convert the data into binary coded hexadecimal value i.e.
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* in hexadecimal code-decode mode, the decoder prints 1 byte
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* on two segments. It checks the lower nibble of the data in
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* the digit register (D3–D0), disregarding bits D7–D4. Hence,
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* preparing the hexadecimal buffer to be sent.
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*
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* Segment 3-2 : Module name
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* 0xEC : EC
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* 0x80 : PORT80
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* Segment 1-0 : Data
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* For console Command segment 3-0 : Data
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*/
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switch (module) {
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case SEVEN_SEG_CONSOLE_DISPLAY:
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/* Segment - 3 */
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buf[0] = (data >> 12) & 0x0F;
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/* Segment - 2 */
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buf[1] = (data >> 8) & 0x0F;
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break;
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case SEVEN_SEG_EC_DISPLAY:
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/* Segment - 3 */
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buf[0] = 0x0E;
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/* Segment - 2 */
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buf[1] = 0x0C;
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break;
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case SEVEN_SEG_PORT80_DISPLAY:
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/* Segment - 3 */
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buf[0] = 0x08;
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/* Segment - 2 */
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buf[1] = 0x00;
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break;
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default:
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CPRINTS("Unknown Module");
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return EC_ERROR_UNKNOWN;
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}
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/* Segment - 1 */
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buf[2] = (data >> 4) & 0x0F;
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/* Segment - 0 */
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buf[3] = data & 0x0F;
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return max695x_i2c_write(MAX695X_DIGIT0_ADDR, buf, ARRAY_SIZE(buf));
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}
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/**
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* Initialise MAX656x 7-segment display.
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*/
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static void max695x_init(void)
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{
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uint8_t buf[4] = {
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[0] = MAX695X_DECODE_MODE_HEX_DECODE,
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[1] = MAX695X_INTENSITY_MEDIUM,
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[2] = MAX695X_SCAN_LIMIT_4,
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[3] = MAX695X_CONFIG_OPR_NORMAL
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};
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max695x_i2c_write(MAX695X_REG_DECODE_MODE, buf, ARRAY_SIZE(buf));
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}
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DECLARE_HOOK(HOOK_INIT, max695x_init, HOOK_PRIO_DEFAULT);
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static void max695x_shutdown(void)
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{
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max695x_i2c_write8(MAX695X_REG_CONFIG,
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MAX695X_CONFIG_OPR_SHUTDOWN);
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}
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DECLARE_HOOK(HOOK_CHIPSET_SHUTDOWN, max695x_shutdown, HOOK_PRIO_DEFAULT);
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#ifdef CONFIG_CMD_SEVEN_SEG_DISPLAY
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static int console_command_max695x_write(int argc, char **argv)
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{
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char *e;
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int val;
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if (argc < 2)
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return EC_ERROR_PARAM_COUNT;
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/* Get value to be written to the seven segment display*/
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val = strtoi(argv[1], &e, 0);
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if (*e || val < 0 || val > UINT16_MAX)
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return EC_ERROR_PARAM1;
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return display_7seg_write(SEVEN_SEG_CONSOLE_DISPLAY, val);
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}
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DECLARE_CONSOLE_COMMAND(seg, console_command_max695x_write,
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"<val>",
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"Write to 7 segment display in hex");
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#endif
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