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