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https://github.com/HamletDuFromage/aio-switch-updater.git
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65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/*
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* USB-PD driver for Nintendo Switch's TI BM92T30
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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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/*
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* TODO:
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* This driver is a stub and relies on incorrect I2C requests.
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* The I2C driver needs to be updated with proper multi-xfer support.
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*
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* For now it replies its whole register range, according to request
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* size. That's because the IC does not support the classic single
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* transfer request-response style.
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*/
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#include <string.h>
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#include "bm92t30_stub.h"
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#include <soc/i2c.h>
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#include <utils/util.h>
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#define STATUS1_INSERT 0x80
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typedef struct _pdo_t{
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u32 amp:10;
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u32 volt:10;
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u32 info:10;
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u32 type:2;
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} pdo_t;
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void bm92t30_get_charger_type(bool *inserted, usb_pd_objects_t *usb_pd)
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{
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u8 buf[32];
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pdo_t pdos[7];
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i2c_recv_buf_big(buf, 32, I2C_1, BM92T30_I2C_ADDR, 0);
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if (inserted)
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*inserted = buf[6] & STATUS1_INSERT ? true : false;
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memcpy(pdos, &buf[17], 15); // We can only get max 4 objects.
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if (usb_pd)
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{
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memset(usb_pd, 0, sizeof(usb_pd_objects_t));
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usb_pd->pdo_no = MIN(buf[16] / sizeof(pdo_t), 4); // We can only get max 4 objects.
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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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}
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}
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