e18fcbba5a
Now that device_api attribute is unmodified at runtime, as well as all the other attributes, it is possible to switch all device driver instance to be constant. A coccinelle rule is used for this: @r_const_dev_1 disable optional_qualifier @ @@ -struct device * +const struct device * @r_const_dev_2 disable optional_qualifier @ @@ -struct device * const +const struct device * Fixes #27399 Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/*
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* Copyright (c) 2016 Open-RnD Sp. z o.o.
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* Copyright (c) 2020 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr.h>
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#include <device.h>
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#include <drivers/gpio.h>
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#include <sys/util.h>
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#include <sys/printk.h>
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#include <inttypes.h>
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#define SLEEP_TIME_MS 1
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/*
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* Get button configuration from the devicetree sw0 alias.
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*
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* At least a GPIO device and pin number must be provided. The 'flags'
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* cell is optional.
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*/
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#define SW0_NODE DT_ALIAS(sw0)
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#if DT_NODE_HAS_STATUS(SW0_NODE, okay)
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#define SW0_GPIO_LABEL DT_GPIO_LABEL(SW0_NODE, gpios)
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#define SW0_GPIO_PIN DT_GPIO_PIN(SW0_NODE, gpios)
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#define SW0_GPIO_FLAGS (GPIO_INPUT | DT_GPIO_FLAGS(SW0_NODE, gpios))
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#else
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#error "Unsupported board: sw0 devicetree alias is not defined"
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#define SW0_GPIO_LABEL ""
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#define SW0_GPIO_PIN 0
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#define SW0_GPIO_FLAGS 0
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#endif
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/* LED helpers, which use the led0 devicetree alias if it's available. */
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static const struct device *initialize_led(void);
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static void match_led_to_button(const struct device *button,
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const struct device *led);
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static struct gpio_callback button_cb_data;
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void button_pressed(const struct device *dev, struct gpio_callback *cb,
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uint32_t pins)
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{
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printk("Button pressed at %" PRIu32 "\n", k_cycle_get_32());
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}
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void main(void)
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{
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const struct device *button;
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const struct device *led;
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int ret;
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button = device_get_binding(SW0_GPIO_LABEL);
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if (button == NULL) {
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printk("Error: didn't find %s device\n", SW0_GPIO_LABEL);
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return;
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}
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ret = gpio_pin_configure(button, SW0_GPIO_PIN, SW0_GPIO_FLAGS);
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if (ret != 0) {
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printk("Error %d: failed to configure %s pin %d\n",
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ret, SW0_GPIO_LABEL, SW0_GPIO_PIN);
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return;
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}
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ret = gpio_pin_interrupt_configure(button,
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SW0_GPIO_PIN,
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GPIO_INT_EDGE_TO_ACTIVE);
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if (ret != 0) {
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printk("Error %d: failed to configure interrupt on %s pin %d\n",
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ret, SW0_GPIO_LABEL, SW0_GPIO_PIN);
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return;
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}
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gpio_init_callback(&button_cb_data, button_pressed, BIT(SW0_GPIO_PIN));
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gpio_add_callback(button, &button_cb_data);
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printk("Set up button at %s pin %d\n", SW0_GPIO_LABEL, SW0_GPIO_PIN);
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led = initialize_led();
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printk("Press the button\n");
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while (1) {
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match_led_to_button(button, led);
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k_msleep(SLEEP_TIME_MS);
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}
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}
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/*
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* The led0 devicetree alias is optional. If present, we'll use it
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* to turn on the LED whenever the button is pressed.
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*/
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#define LED0_NODE DT_ALIAS(led0)
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#if DT_NODE_HAS_STATUS(LED0_NODE, okay) && DT_NODE_HAS_PROP(LED0_NODE, gpios)
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#define LED0_GPIO_LABEL DT_GPIO_LABEL(LED0_NODE, gpios)
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#define LED0_GPIO_PIN DT_GPIO_PIN(LED0_NODE, gpios)
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#define LED0_GPIO_FLAGS (GPIO_OUTPUT | DT_GPIO_FLAGS(LED0_NODE, gpios))
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#endif
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#ifdef LED0_GPIO_LABEL
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static const struct device *initialize_led(void)
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{
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const struct device *led;
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int ret;
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led = device_get_binding(LED0_GPIO_LABEL);
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if (led == NULL) {
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printk("Didn't find LED device %s\n", LED0_GPIO_LABEL);
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return NULL;
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}
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ret = gpio_pin_configure(led, LED0_GPIO_PIN, LED0_GPIO_FLAGS);
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if (ret != 0) {
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printk("Error %d: failed to configure LED device %s pin %d\n",
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ret, LED0_GPIO_LABEL, LED0_GPIO_PIN);
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return NULL;
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}
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printk("Set up LED at %s pin %d\n", LED0_GPIO_LABEL, LED0_GPIO_PIN);
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return led;
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}
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static void match_led_to_button(const struct device *button,
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const struct device *led)
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{
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bool val;
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val = gpio_pin_get(button, SW0_GPIO_PIN);
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gpio_pin_set(led, LED0_GPIO_PIN, val);
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}
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#else /* !defined(LED0_GPIO_LABEL) */
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static const struct device *initialize_led(void)
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{
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printk("No LED device was defined\n");
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return NULL;
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}
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static void match_led_to_button(const struct device *button,
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const struct device *led)
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{
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return;
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}
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#endif /* LED0_GPIO_LABEL */
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