--- /dev/null
+/*
+ * Control GPIO pins on the fly
+ *
+ * Copyright (c) 2008-2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <dm.h>
+#include <asm/gpio.h>
+
+int __weak name_to_gpio(const char *name)
+{
+ return simple_strtoul(name, NULL, 10);
+}
+
+enum gpio_cmd {
+ GPIO_INPUT,
+ GPIO_SET,
+ GPIO_CLEAR,
+ GPIO_TOGGLE,
+};
+
+#if defined(CONFIG_DM_GPIO) && !defined(gpio_status)
+static const char * const gpio_function[] = {
+ "input",
+ "output",
+ "unknown",
+};
+
+static void show_gpio(struct device *dev, const char *bank_name, int offset)
+{
+ struct dm_gpio_ops *ops = gpio_get_ops(dev);
+ char buf[80];
+ int ret;
+
+ *buf = '\0';
+ if (ops->get_state) {
+ ret = ops->get_state(dev, offset, buf, sizeof(buf));
+ if (ret) {
+ puts("<unknown>");
+ return;
+ }
+ } else {
+ int func = GPIOF_UNKNOWN;
+ int ret;
+
+ if (ops->get_function) {
+ ret = ops->get_function(dev, offset);
+ if (ret >= 0 && ret < ARRAY_SIZE(gpio_function))
+ func = ret;
+ }
+ sprintf(buf, "%s%u: %8s %d", bank_name, offset,
+ gpio_function[func], ops->get_value(dev, offset));
+ }
+
+ puts(buf);
+ puts("\n");
+}
+
+static int do_gpio_status(const char *gpio_name)
+{
+ struct device *dev;
+ int newline = 0;
+ int ret;
+
+ if (gpio_name && !*gpio_name)
+ gpio_name = NULL;
+ for (ret = uclass_first_device(UCLASS_GPIO, &dev);
+ dev;
+ ret = uclass_next_device(&dev)) {
+ const char *bank_name;
+ int num_bits;
+
+ bank_name = gpio_get_bank_info(dev, &num_bits);
+
+ if (!gpio_name || !bank_name ||
+ !strncmp(gpio_name, bank_name, strlen(bank_name))) {
+ const char *p = NULL;
+ int offset;
+
+ if (bank_name) {
+ if (newline)
+ putc('\n');
+ printf("Bank %s:\n", bank_name);
+ }
+ newline = 1;
+ if (gpio_name && bank_name) {
+ p = gpio_name + strlen(bank_name);
+ offset = simple_strtoul(p, NULL, 10);
+ show_gpio(dev, bank_name, offset);
+ } else {
+ for (offset = 0; offset < num_bits; offset++)
+ show_gpio(dev, bank_name, offset);
+ }
+ }
+ }
+
+ return ret;
+}
+#endif
+
+static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ unsigned int gpio;
+ enum gpio_cmd sub_cmd;
+ ulong value;
+ const char *str_cmd, *str_gpio = NULL;
+#ifdef CONFIG_DM_GPIO
+ int ret;
+#endif
+
+ if (argc < 2)
+ show_usage:
+ return CMD_RET_USAGE;
+ str_cmd = argv[1];
+ if (argc > 2)
+ str_gpio = argv[2];
+ if (!strcmp(str_cmd, "status")) {
+ /* Support deprecated gpio_status() */
+#ifdef gpio_status
+ gpio_status();
+ return 0;
+#elif defined(CONFIG_DM_GPIO)
+ return cmd_process_error(cmdtp, do_gpio_status(str_gpio));
+#else
+ goto show_usage;
+#endif
+ }
+
+ if (!str_gpio)
+ goto show_usage;
+
+ /* parse the behavior */
+ switch (*str_cmd) {
+ case 'i': sub_cmd = GPIO_INPUT; break;
+ case 's': sub_cmd = GPIO_SET; break;
+ case 'c': sub_cmd = GPIO_CLEAR; break;
+ case 't': sub_cmd = GPIO_TOGGLE; break;
+ default: goto show_usage;
+ }
+
+#if defined(CONFIG_DM_GPIO)
+ /*
+ * TODO(sjg@chromium.org): For now we must fit into the existing GPIO
+ * framework, so we look up the name here and convert it to a GPIO number.
+ * Once all GPIO drivers are converted to driver model, we can change the
+ * code here to use the GPIO uclass interface instead of the numbered
+ * GPIO compatibility layer.
+ */
+ ret = gpio_lookup_name(str_gpio, NULL, NULL, &gpio);
+ if (ret)
+ return cmd_process_error(cmdtp, ret);
+#else
+ /* turn the gpio name into a gpio number */
+ gpio = name_to_gpio(str_gpio);
+ if (gpio < 0)
+ goto show_usage;
+#endif
+ /* grab the pin before we tweak it */
+ if (gpio_request(gpio, "cmd_gpio")) {
+ printf("gpio: requesting pin %u failed\n", gpio);
+ return -1;
+ }
+
+ /* finally, let's do it: set direction and exec command */
+ if (sub_cmd == GPIO_INPUT) {
+ gpio_direction_input(gpio);
+ value = gpio_get_value(gpio);
+ } else {
+ switch (sub_cmd) {
+ case GPIO_SET: value = 1; break;
+ case GPIO_CLEAR: value = 0; break;
+ case GPIO_TOGGLE: value = !gpio_get_value(gpio); break;
+ default: goto show_usage;
+ }
+ gpio_direction_output(gpio, value);
+ }
+ printf("gpio: pin %s (gpio %i) value is %lu\n",
+ str_gpio, gpio, value);
+
+ gpio_free(gpio);
+
+ return value;
+}
+
+U_BOOT_CMD(gpio, 3, 0, do_gpio,
+ "query and control gpio pins",
+ "<input|set|clear|toggle> <pin>\n"
+ " - input/set/clear/toggle the specified pin\n"
+ "gpio status [<bank> | <pin>]");
Code Review / kvmfornfv.git / blobdiff