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hekate/bdk/power/bm92t36.c

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/*
* USB-PD driver for Nintendo Switch's TI BM92T36
*
* Copyright (c) 2020 CTCaer
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include "bm92t36.h"
#include <soc/i2c.h>
#include <utils/util.h>
#define ALERT_STATUS_REG 0x2
#define STATUS1_REG 0x3
#define STATUS2_REG 0x4
#define COMMAND_REG 0x5
#define CONFIG1_REG 0x6
#define DEV_CAPS_REG 0x7
#define READ_PDOS_SRC_REG 0x8
#define CONFIG2_REG 0x17
#define DP_STATUS_REG 0x18
#define DP_ALERT_EN_REG 0x19
#define VENDOR_CONFIG_REG 0x1A
#define AUTO_NGT_FIXED_REG 0x20
#define AUTO_NGT_BATT_REG 0x23
#define SYS_CONFIG1_REG 0x26
#define SYS_CONFIG2_REG 0x27
#define CURRENT_PDO_REG 0x28
#define CURRENT_RDO_REG 0x2B
#define ALERT_ENABLE_REG 0x2E
#define SYS_CONFIG3_REG 0x2F
#define SET_RDO_REG 0x30
#define PDOS_SNK_REG 0x33
#define PDOS_SRC_PROV_REG 0x3C
#define FW_TYPE_REG 0x4B
#define FW_REVISION_REG 0x4C
#define MAN_ID_REG 0x4D
#define DEV_ID_REG 0x4E
#define REV_ID_REG 0x4F
#define INCOMING_VDM_REG 0x50
#define OUTGOING_VDM_REG 0x60
#define STATUS1_INSERT BIT(7) // Cable inserted.
typedef struct _pd_object_t {
unsigned int amp:10;
unsigned int volt:10;
unsigned int info:10;
unsigned int type:2;
} __attribute__((packed)) pd_object_t;
static int _bm92t36_read_reg(u8 *buf, u32 size, u32 reg)
{
return i2c_recv_buf_big(buf, size, I2C_1, BM92T36_I2C_ADDR, reg);
}
void bm92t36_get_sink_info(bool *inserted, usb_pd_objects_t *usb_pd)
{
u8 buf[32];
pd_object_t pdos[7];
if (inserted)
{
_bm92t36_read_reg(buf, 2, STATUS1_REG);
*inserted = buf[0] & STATUS1_INSERT ? true : false;
}
if (usb_pd)
{
_bm92t36_read_reg(buf, 29, READ_PDOS_SRC_REG);
memcpy(pdos, &buf[1], 28);
memset(usb_pd, 0, sizeof(usb_pd_objects_t));
usb_pd->pdo_no = buf[0] / sizeof(pd_object_t);
for (u32 i = 0; i < usb_pd->pdo_no; i++)
{
usb_pd->pdos[i].amperage = pdos[i].amp * 10;
usb_pd->pdos[i].voltage = (pdos[i].volt * 50) / 1000;
}
_bm92t36_read_reg(buf, 5, CURRENT_PDO_REG);
memcpy(pdos, &buf[1], 4);
usb_pd->selected_pdo.amperage = pdos[0].amp * 10;
usb_pd->selected_pdo.voltage = (pdos[0].volt * 50) / 1000;
}
}