/* * Copyright (c) 2023-2024 Analog Devices, Inc. * * SPDX-License-Identifier: Apache-2.0 */ #include #include #include #include #include #define DT_DRV_COMPAT adi_max32_w1 LOG_MODULE_REGISTER(w1_max32, CONFIG_W1_LOG_LEVEL); struct max32_w1_config { struct w1_master_config w1_config; mxc_owm_regs_t *regs; const struct pinctrl_dev_config *pctrl; const struct device *clock; struct max32_perclk perclk; uint8_t internal_pullup; uint8_t external_pullup; uint8_t long_line_mode; }; struct max32_w1_data { struct w1_master_data w1_data; uint8_t reg_device_config; }; static int api_reset_bus(const struct device *dev) { int ret; const struct max32_w1_config *const cfg = dev->config; mxc_owm_regs_t *regs = cfg->regs; /* 0 if no 1-wire devices responded during the presence pulse, 1 otherwise */ ret = MXC_OWM_Reset(); if (ret > 0) { /* Check OW pin input state due to presence detect pin seems not work well */ if (regs->ctrl_stat & MXC_F_OWM_CTRL_STAT_OW_INPUT) { ret = 1; /* At least 1 device on the line */ } else { ret = 0; /* no device on the line */ } } return ret; } static int api_read_bit(const struct device *dev) { int ret; ret = MXC_OWM_ReadBit(); if (ret < 0) { if (MXC_OWM_GetPresenceDetect() == 0) { /* if no slave connected to the bus, read bits shall be logical ones */ ret = 1; } else { return -EIO; } } return ret; } static int api_write_bit(const struct device *dev, bool bit) { int ret; ret = MXC_OWM_WriteBit(bit); if (ret < 0) { if (MXC_OWM_GetPresenceDetect() == 0) { /* if no slave connected to the bus, write shall success */ ret = 0; } else { return -EIO; } } return ret; } static int api_read_byte(const struct device *dev) { int ret; ret = MXC_OWM_ReadByte(); if (ret < 0) { if (MXC_OWM_GetPresenceDetect() == 0) { /* if no slave connected to the bus, read bits shall be logical ones */ ret = 0xff; } else { return -EIO; } } return ret; } static int api_write_byte(const struct device *dev, uint8_t byte) { int ret; ret = MXC_OWM_WriteByte(byte); if (ret < 0) { if (MXC_OWM_GetPresenceDetect() == 0) { /* if no slave connected to the bus, write shall success */ ret = 0; } else { return -EIO; } } return ret; } static int api_configure(const struct device *dev, enum w1_settings_type type, uint32_t value) { int ret = 0; switch (type) { case W1_SETTING_SPEED: MXC_OWM_SetOverdrive(value); break; case W1_SETTING_STRONG_PULLUP: const struct max32_w1_config *const dev_config = dev->config; mxc_owm_regs_t *regs = dev_config->regs; if (value == 1) { regs->cfg |= MXC_F_OWM_CFG_EXT_PULLUP_MODE; } else { regs->cfg &= ~MXC_F_OWM_CFG_EXT_PULLUP_MODE; } break; default: return -EINVAL; } return ret; } static int w1_max32_init(const struct device *dev) { int ret; const struct max32_w1_config *const cfg = dev->config; mxc_owm_cfg_t mxc_owm_cfg; if (!device_is_ready(cfg->clock)) { LOG_ERR("clock control device not ready"); return -ENODEV; } MXC_OWM_Shutdown(); ret = clock_control_on(cfg->clock, (clock_control_subsys_t)&cfg->perclk); if (ret != 0) { LOG_ERR("cannot enable OWM clock"); return ret; } ret = pinctrl_apply_state(cfg->pctrl, PINCTRL_STATE_DEFAULT); if (ret) { return ret; } mxc_owm_cfg.int_pu_en = cfg->internal_pullup; mxc_owm_cfg.ext_pu_mode = cfg->external_pullup; mxc_owm_cfg.long_line_mode = cfg->long_line_mode; ret = Wrap_MXC_OWM_Init(&mxc_owm_cfg); return ret; } static const struct w1_driver_api w1_max32_driver_api = { .reset_bus = api_reset_bus, .read_bit = api_read_bit, .write_bit = api_write_bit, .read_byte = api_read_byte, .write_byte = api_write_byte, .configure = api_configure, }; #define MAX32_W1_INIT(_num) \ PINCTRL_DT_INST_DEFINE(_num); \ static const struct max32_w1_config max32_w1_config_##_num = { \ .w1_config.slave_count = W1_INST_SLAVE_COUNT(_num), \ .regs = (mxc_owm_regs_t *)DT_INST_REG_ADDR(_num), \ .pctrl = PINCTRL_DT_INST_DEV_CONFIG_GET(_num), \ .clock = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(_num)), \ .perclk.bus = DT_INST_CLOCKS_CELL(_num, offset), \ .perclk.bit = DT_INST_CLOCKS_CELL(_num, bit), \ .internal_pullup = DT_INST_PROP(_num, internal_pullup), \ .external_pullup = DT_INST_PROP_OR(_num, external_pullup, 0), \ .long_line_mode = DT_INST_PROP(_num, long_line_mode), \ }; \ static struct max32_w1_data max32_owm_data##_num; \ DEVICE_DT_INST_DEFINE(_num, w1_max32_init, NULL, &max32_owm_data##_num, \ &max32_w1_config_##_num, POST_KERNEL, CONFIG_W1_INIT_PRIORITY, \ &w1_max32_driver_api); DT_INST_FOREACH_STATUS_OKAY(MAX32_W1_INIT)