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