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126 lines
3.6 KiB
126 lines
3.6 KiB
/* |
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* Copyright (c) 2021 Nuvoton Technology Corporation. |
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* |
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* SPDX-License-Identifier: Apache-2.0 |
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*/ |
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#define DT_DRV_COMPAT nuvoton_npcx_ps2_channel |
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/** |
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* @file |
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* @brief Nuvoton NPCX PS/2 driver |
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* |
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* This file contains the driver of PS/2 buses (channels) which provides the |
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* connection between Zephyr PS/2 API functions and NPCX PS/2 controller driver |
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* to support PS/2 transactions. |
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* |
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*/ |
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#include <zephyr/drivers/clock_control.h> |
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#include <zephyr/drivers/pinctrl.h> |
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#include <zephyr/drivers/ps2.h> |
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#include <soc.h> |
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#include <zephyr/logging/log.h> |
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LOG_MODULE_REGISTER(ps2_npcx_channel, CONFIG_PS2_LOG_LEVEL); |
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#include "ps2_npcx_controller.h" |
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/* Device config */ |
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struct ps2_npcx_ch_config { |
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/* Indicate the channel's number of the PS/2 channel device */ |
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uint8_t channel_id; |
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const struct device *ps2_ctrl; |
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/* pinmux configuration */ |
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const struct pinctrl_dev_config *pcfg; |
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}; |
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/* PS/2 api functions */ |
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static int ps2_npcx_ch_configure(const struct device *dev, |
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ps2_callback_t callback_isr) |
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{ |
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const struct ps2_npcx_ch_config *const config = dev->config; |
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int ret; |
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ret = ps2_npcx_ctrl_configure(config->ps2_ctrl, config->channel_id, |
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callback_isr); |
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if (ret != 0) { |
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return ret; |
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} |
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return ps2_npcx_ctrl_enable_interface(config->ps2_ctrl, |
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config->channel_id, 1); |
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} |
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static int ps2_npcx_ch_write(const struct device *dev, uint8_t value) |
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{ |
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const struct ps2_npcx_ch_config *const config = dev->config; |
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return ps2_npcx_ctrl_write(config->ps2_ctrl, config->channel_id, value); |
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} |
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static int ps2_npcx_ch_enable_interface(const struct device *dev) |
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{ |
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const struct ps2_npcx_ch_config *const config = dev->config; |
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return ps2_npcx_ctrl_enable_interface(config->ps2_ctrl, |
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config->channel_id, 1); |
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} |
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static int ps2_npcx_ch_inhibit_interface(const struct device *dev) |
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{ |
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const struct ps2_npcx_ch_config *const config = dev->config; |
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return ps2_npcx_ctrl_enable_interface(config->ps2_ctrl, |
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config->channel_id, 0); |
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} |
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/* PS/2 driver registration */ |
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static int ps2_npcx_channel_init(const struct device *dev) |
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{ |
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const struct ps2_npcx_ch_config *const config = dev->config; |
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int ret; |
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if (!device_is_ready(config->ps2_ctrl)) { |
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LOG_ERR("%s device not ready", config->ps2_ctrl->name); |
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return -ENODEV; |
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} |
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/* Configure pin-mux for PS/2 device */ |
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ret = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT); |
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if (ret < 0) { |
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LOG_ERR("PS2 pinctrl setup failed (%d)", ret); |
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return ret; |
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} |
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return 0; |
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} |
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static DEVICE_API(ps2, ps2_channel_npcx_driver_api) = { |
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.config = ps2_npcx_ch_configure, |
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.read = NULL, |
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.write = ps2_npcx_ch_write, |
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.disable_callback = ps2_npcx_ch_inhibit_interface, |
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.enable_callback = ps2_npcx_ch_enable_interface, |
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}; |
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/* PS/2 channel initialization macro functions */ |
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#define NPCX_PS2_CHANNEL_INIT(inst) \ |
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\ |
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PINCTRL_DT_INST_DEFINE(inst); \ |
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\ |
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static const struct ps2_npcx_ch_config ps2_npcx_ch_cfg_##inst = { \ |
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.channel_id = DT_INST_PROP(inst, channel), \ |
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.ps2_ctrl = DEVICE_DT_GET(DT_INST_PARENT(inst)), \ |
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.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(inst), \ |
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}; \ |
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\ |
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DEVICE_DT_INST_DEFINE(inst, ps2_npcx_channel_init, NULL, NULL, \ |
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&ps2_npcx_ch_cfg_##inst, POST_KERNEL, \ |
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CONFIG_PS2_CHANNEL_INIT_PRIORITY, \ |
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&ps2_channel_npcx_driver_api); |
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DT_INST_FOREACH_STATUS_OKAY(NPCX_PS2_CHANNEL_INIT) |
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/* PS/2 channel driver must be initialized after PS/2 controller driver */ |
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BUILD_ASSERT(CONFIG_PS2_CHANNEL_INIT_PRIORITY > CONFIG_PS2_INIT_PRIORITY);
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