1 /*
2 * Copyright (c) 2021 Nuvoton Technology Corporation.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #define DT_DRV_COMPAT nuvoton_nct38xx_gpio
8
9 #include <zephyr/device.h>
10 #include <zephyr/drivers/gpio.h>
11 #include <zephyr/drivers/gpio/gpio_nct38xx.h>
12 #include <zephyr/kernel.h>
13 #include <zephyr/sys/util_macro.h>
14
15 #include "gpio_nct38xx.h"
16
17 #include <zephyr/logging/log.h>
18 LOG_MODULE_REGISTER(gpio_ntc38xx, CONFIG_GPIO_LOG_LEVEL);
19
nct38xx_gpio_alert_handler(const struct device * dev)20 void nct38xx_gpio_alert_handler(const struct device *dev)
21 {
22 const struct gpio_nct38xx_config *const config = dev->config;
23
24 for (int i = 0; i < config->sub_gpio_port_num; i++) {
25 gpio_nct38xx_dispatch_port_isr(config->sub_gpio_dev[i]);
26 }
27 }
28
nct38xx_init_interrupt(const struct device * dev)29 static int nct38xx_init_interrupt(const struct device *dev)
30 {
31 uint16_t alert, alert_mask = 0;
32
33 /* Disable all interrupt */
34 if (nct38xx_reg_burst_write(dev, NCT38XX_REG_ALERT_MASK, (uint8_t *)&alert_mask,
35 sizeof(alert_mask))) {
36 return -EIO;
37 }
38
39 /* Enable vendor-defined alert for GPIO. */
40 alert_mask |= BIT(NCT38XX_REG_ALERT_MASK_VENDOR_DEFINDED_ALERT);
41
42 /* Clear alert */
43 if (nct38xx_reg_burst_read(dev, NCT38XX_REG_ALERT, (uint8_t *)&alert, sizeof(alert))) {
44 return -EIO;
45 }
46 alert &= alert_mask;
47 if (alert) {
48 if (nct38xx_reg_burst_write(dev, NCT38XX_REG_ALERT, (uint8_t *)&alert,
49 sizeof(alert))) {
50 return -EIO;
51 }
52 }
53
54 if (nct38xx_reg_burst_write(dev, NCT38XX_REG_ALERT_MASK, (uint8_t *)&alert_mask,
55 sizeof(alert_mask))) {
56 return -EIO;
57 }
58
59 return 0;
60 }
61
nct38xx_gpio_init(const struct device * dev)62 static int nct38xx_gpio_init(const struct device *dev)
63 {
64 const struct gpio_nct38xx_config *const config = dev->config;
65
66 /* Check I2C is ready */
67 if (!device_is_ready(config->i2c_dev.bus)) {
68 LOG_ERR("%s device not ready", config->i2c_dev.bus->name);
69 return -ENODEV;
70 }
71
72 if (IS_ENABLED(CONFIG_GPIO_NCT38XX_INTERRUPT)) {
73 nct38xx_init_interrupt(dev);
74 }
75
76 return 0;
77 }
78
79 #define GPIO_NCT38XX_DEVICE_INSTANCE(inst) \
80 static const struct device *sub_gpio_dev_##inst[] = { \
81 DT_INST_FOREACH_CHILD_STATUS_OKAY_SEP(inst, DEVICE_DT_GET, (,)) \
82 }; \
83 static const struct gpio_nct38xx_config gpio_nct38xx_cfg_##inst = { \
84 .i2c_dev = I2C_DT_SPEC_INST_GET(inst), \
85 .sub_gpio_dev = sub_gpio_dev_##inst, \
86 .sub_gpio_port_num = ARRAY_SIZE(sub_gpio_dev_##inst), \
87 }; \
88 static struct gpio_nct38xx_data gpio_nct38xx_data_##inst = { \
89 .dev = DEVICE_DT_INST_GET(inst), \
90 }; \
91 DEVICE_DT_INST_DEFINE(inst, nct38xx_gpio_init, NULL, &gpio_nct38xx_data_##inst, \
92 &gpio_nct38xx_cfg_##inst, POST_KERNEL, \
93 CONFIG_GPIO_NCT38XX_INIT_PRIORITY, NULL);
94
95 DT_INST_FOREACH_STATUS_OKAY(GPIO_NCT38XX_DEVICE_INSTANCE)
96
