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