171 lines
3.3 KiB
C
171 lines
3.3 KiB
C
/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2022-11-26 GuEe-GUI first version
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*/
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#include <dt-bindings/pin/pin.h>
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#include "pin_dm.h"
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static const char * const gpio_suffixes[] =
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{
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"gpios", "gpio"
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};
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rt_ssize_t rt_ofw_get_named_pin(struct rt_ofw_node *np, const char *propname, int index,
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rt_uint8_t *out_mode, rt_uint8_t *out_value)
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{
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rt_ssize_t pin = -1;
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rt_uint8_t mode;
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rt_uint8_t value;
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rt_uint32_t flags;
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char gpios_name[64];
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struct rt_device_pin *pin_dev = 0;
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struct rt_ofw_node *pin_dev_np = 0;
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struct rt_ofw_cell_args pin_args = {0};
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if (!np && index < 0)
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{
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return -RT_EINVAL;
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}
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for (int i = 0; i < RT_ARRAY_SIZE(gpio_suffixes); ++i)
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{
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if (propname)
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{
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rt_snprintf(gpios_name, sizeof(gpios_name), "%s-%s", propname, gpio_suffixes[i]);
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}
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else
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{
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rt_snprintf(gpios_name, sizeof(gpios_name), "%s", gpio_suffixes[i]);
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}
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pin = rt_ofw_parse_phandle_cells(np, gpios_name, "#gpio-cells", index, &pin_args);
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if (pin >= 0)
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{
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break;
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}
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}
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if (pin < 0)
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{
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return pin;
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}
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pin_dev_np = pin_args.data;
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pin_dev = rt_ofw_data(pin_dev_np);
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if (!pin_dev)
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{
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pin = -RT_ERROR;
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goto _out_converts;
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}
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value = PIN_LOW;
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mode = PIN_MODE_OUTPUT;
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if (pin_dev->ops->pin_parse)
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{
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pin = pin_dev->ops->pin_parse(&pin_dev->parent, &pin_args, &flags);
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}
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else
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{
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/*
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* We always assume that the args[0] is the pin number if driver not
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* implemented `pin_parse`.
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*/
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pin = pin_args.args[0];
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goto _out_converts;
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}
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if (out_mode)
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{
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if (flags & PIN_OPEN_DRAIN)
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{
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mode = PIN_MODE_OUTPUT_OD;
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}
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switch (flags & RT_GENMASK(6, 4))
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{
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case PIN_PULL_UP:
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mode = PIN_MODE_INPUT_PULLUP;
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break;
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case PIN_PULL_DOWN:
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mode = PIN_MODE_INPUT_PULLDOWN;
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break;
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case PIN_PULL_DISABLE:
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mode = PIN_MODE_INPUT;
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break;
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}
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}
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if (out_value)
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{
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if (flags == (PIN_ACTIVE_HIGH | PIN_PUSH_PULL))
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{
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value = PIN_HIGH;
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}
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else if (flags == (PIN_ACTIVE_LOW | PIN_PUSH_PULL))
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{
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value = PIN_LOW;
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}
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}
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_out_converts:
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rt_ofw_node_put(pin_dev_np);
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if (out_mode)
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{
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*out_mode = mode;
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}
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if (out_value)
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{
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*out_value = value;
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}
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return pin;
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}
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rt_ssize_t rt_ofw_get_named_pin_count(struct rt_ofw_node *np, const char *propname)
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{
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char gpios_name[64];
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rt_ssize_t count = 0;
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if (!np || !propname)
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{
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return -RT_EINVAL;
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}
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for (int i = 0; i < RT_ARRAY_SIZE(gpio_suffixes); ++i)
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{
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if (propname)
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{
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rt_snprintf(gpios_name, sizeof(gpios_name), "%s-%s", propname, gpio_suffixes[i]);
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}
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else
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{
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rt_snprintf(gpios_name, sizeof(gpios_name), "%s", gpio_suffixes[i]);
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}
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count = rt_ofw_count_phandle_cells(np, propname, "#gpio-cells");
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if (count > 0)
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{
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break;
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}
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}
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return count;
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}
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