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/* Copyright 2022 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.
*/
#include <string.h>
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "i2c.h"
#include "rgb_keyboard.h"
#include "stddef.h"
#include "timer.h"
#define CPRINTF(fmt, args...) cprintf(CC_RGBKBD, "AW20198: " fmt, ##args)
#define CPRINTS(fmt, args...) cprints(CC_RGBKBD, "AW20198: " fmt, ##args)
/* This depends on AD0 and Ad1. (GRD, GRD) = 0x20. */
#define AW20198_I2C_ADDR_FLAG 0x20
#define AW20198_ROW_SIZE 6
#define AW20198_COL_SIZE 11
#define AW20198_GRID_SIZE (AW20198_COL_SIZE * AW20198_ROW_SIZE)
#define AW20198_BUF_SIZE (SIZE_OF_RGB * AW20198_GRID_SIZE)
#define AW20198_PAGE_FUNC 0xC0
#define AW20198_PAGE_PWM 0xC1
#define AW20198_PAGE_SCALE 0xC2
#define AW20198_REG_GCR 0x00
#define AW20198_REG_GCC 0x01
#define AW20198_REG_RSTN 0x2F
#define AW20198_REG_MIXCR 0x46
#define AW20198_REG_PAGE 0xF0
#define AW20198_RESET_MAGIC 0xAE
static int aw20198_read(struct rgbkbd *ctx, uint8_t addr, uint8_t *value)
{
return i2c_xfer(ctx->cfg->i2c, AW20198_I2C_ADDR_FLAG,
&addr, sizeof(addr), value, sizeof(*value));
}
static int aw20198_write(struct rgbkbd *ctx, uint8_t addr, uint8_t value)
{
uint8_t buf[2] = {
[0] = addr,
[1] = value,
};
return i2c_xfer(ctx->cfg->i2c, AW20198_I2C_ADDR_FLAG,
buf, sizeof(buf), NULL, 0);
}
static int aw20198_set_page(struct rgbkbd *ctx, uint8_t page)
{
return aw20198_write(ctx, AW20198_REG_PAGE, page);
}
static int aw20198_get_config(struct rgbkbd *ctx, uint8_t addr, uint8_t *value)
{
int rv = aw20198_set_page(ctx, AW20198_PAGE_FUNC);
if (rv) {
return rv;
}
return aw20198_read(ctx, addr, value);
}
static int aw20198_set_config(struct rgbkbd *ctx, uint8_t addr, uint8_t value)
{
int rv = aw20198_set_page(ctx, AW20198_PAGE_FUNC);
if (rv) {
return rv;
}
return aw20198_write(ctx, addr, value);
}
static int aw20198_reset(struct rgbkbd *ctx)
{
return aw20198_set_config(ctx, AW20198_REG_RSTN, AW20198_RESET_MAGIC);
}
static int aw20198_enable(struct rgbkbd *ctx, bool enable)
{
uint8_t cfg;
int rv;
rv = aw20198_get_config(ctx, AW20198_REG_GCR, &cfg);
if (rv) {
return rv;
}
return aw20198_write(ctx, AW20198_REG_GCR,
cfg | (enable ? BIT(0) : 0));
}
static int aw20198_set_color(struct rgbkbd *ctx, uint8_t offset,
struct rgb_s *color, uint8_t len)
{
uint8_t buf[sizeof(offset) + AW20198_BUF_SIZE];
const int frame_len = len * SIZE_OF_RGB + sizeof(offset);
const int frame_offset = offset * SIZE_OF_RGB;
int i, rv;
if (frame_offset + frame_len > sizeof(buf)) {
return EC_ERROR_OVERFLOW;
}
rv = aw20198_set_page(ctx, AW20198_PAGE_PWM);
if (rv) {
return rv;
}
buf[0] = offset * SIZE_OF_RGB;
for (i = 0; i < len; i++) {
buf[i * SIZE_OF_RGB + 1] = color[i].r;
buf[i * SIZE_OF_RGB + 2] = color[i].g;
buf[i * SIZE_OF_RGB + 3] = color[i].b;
}
return i2c_xfer(ctx->cfg->i2c, AW20198_I2C_ADDR_FLAG,
buf, frame_len, NULL, 0);
}
static int aw20198_set_scale(struct rgbkbd *ctx, uint8_t offset, uint8_t scale,
uint8_t len)
{
uint8_t buf[sizeof(offset) + AW20198_BUF_SIZE];
const int frame_len = len * SIZE_OF_RGB + sizeof(offset);
const int frame_offset = offset * SIZE_OF_RGB;
int rv;
if (frame_offset + frame_len > sizeof(buf)) {
return EC_ERROR_OVERFLOW;
}
rv = aw20198_set_page(ctx, AW20198_PAGE_SCALE);
if (rv) {
return rv;
}
buf[0] = offset * SIZE_OF_RGB;
memset(&buf[1], scale, len * SIZE_OF_RGB);
return i2c_xfer(ctx->cfg->i2c, AW20198_I2C_ADDR_FLAG,
buf, frame_len, NULL, 0);
}
static int aw20198_set_gcc(struct rgbkbd *ctx, uint8_t level)
{
return aw20198_set_config(ctx, AW20198_REG_GCC, level);
}
static int aw20198_init(struct rgbkbd *ctx)
{
uint8_t id;
int rv;
rv = aw20198_reset(ctx);
msleep(3);
rv |= aw20198_enable(ctx, true);
if (rv) {
CPRINTS("Failed to enable or reset (%d)", rv);
return rv;
}
/* Read chip ID, assuming page is still 0. */
rv = aw20198_read(ctx, AW20198_REG_RSTN, &id);
if (rv) {
return rv;
}
CPRINTS("ID=0x%02x", id);
return rv;
}
const struct rgbkbd_drv aw20198_drv = {
.reset = aw20198_reset,
.init = aw20198_init,
.enable = aw20198_enable,
.set_color = aw20198_set_color,
.set_scale = aw20198_set_scale,
.set_gcc = aw20198_set_gcc,
};
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