/* SPDX-License-Identifier: GPL-2.0-only OR MIT */ #include <console/console.h> #include <device/i2c_simple.h> #include <soc/mt6691.h> #define MT6691_MIN_VOLTAGE 300000 #define MT6691_MAX_VOLTAGE 1300000 #define MT6691_STEP_UV 5000 enum { MT6691_SLAVE_ADDR = 0x51, }; int mt6691_set_voltage(uint8_t i2c_num, unsigned int volt_uv) { uint8_t selector; if (volt_uv > MT6691_MAX_VOLTAGE || volt_uv < MT6691_MIN_VOLTAGE) { printk(BIOS_ERR, "%s: voltage out of range\n", __func__); return -1; } selector = DIV_ROUND_UP(volt_uv - MT6691_MIN_VOLTAGE, MT6691_STEP_UV); return i2c_write_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_VSEL0, selector, 0xFF, 0); } int mt6691_get_voltage(uint8_t i2c_num) { uint8_t selector = 0; unsigned int volt; if (i2c_read_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_VSEL0, &selector, 0xFF, 0) < 0) { printk(BIOS_ERR, "%s: failed to get voltage from i2c\n", __func__); return -1; } volt = (selector * MT6691_STEP_UV) + MT6691_MIN_VOLTAGE; if (volt > MT6691_MAX_VOLTAGE) { printk(BIOS_ERR, "%s: voltage out of range\n", __func__); return -1; } return volt; } static uint8_t get_mt6691_chip_id(uint8_t i2c_num) { uint8_t id; if (i2c_read_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_MONITOR, &id, 0x1, MT6691_PGOOD_SHIFT) < 0) { printk(BIOS_ERR, "%s: failed to read from i2c", __func__); return 0; } return id; } void mt6691_probe(uint8_t i2c_num) { /* Check device ID is MT6691 */ if (!get_mt6691_chip_id(i2c_num)) { printk(BIOS_ERR, "unknown MT6691 chip_id\n"); return; } /* Slew rate 12mV */ i2c_write_field(i2c_num, MT6691_SLAVE_ADDR, MT6691_CTRL2, 0x1, MT6691_DN_SR_MASK, MT6691_DN_SR_SHIFT); }