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-rw-r--r--cmd/gpio.c220
1 files changed, 220 insertions, 0 deletions
diff --git a/cmd/gpio.c b/cmd/gpio.c
new file mode 100644
index 0000000..2b78b16
--- /dev/null
+++ b/cmd/gpio.c
@@ -0,0 +1,220 @@
+/*
+ * 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 <errno.h>
+#include <dm.h>
+#include <asm/gpio.h>
+
+__weak int 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)
+
+/* A few flags used by show_gpio() */
+enum {
+ FLAG_SHOW_ALL = 1 << 0,
+ FLAG_SHOW_BANK = 1 << 1,
+ FLAG_SHOW_NEWLINE = 1 << 2,
+};
+
+static void gpio_get_description(struct udevice *dev, const char *bank_name,
+ int offset, int *flagsp)
+{
+ char buf[80];
+ int ret;
+
+ ret = gpio_get_function(dev, offset, NULL);
+ if (ret < 0)
+ goto err;
+ if (!(*flagsp & FLAG_SHOW_ALL) && ret == GPIOF_UNUSED)
+ return;
+ if ((*flagsp & FLAG_SHOW_BANK) && bank_name) {
+ if (*flagsp & FLAG_SHOW_NEWLINE) {
+ putc('\n');
+ *flagsp &= ~FLAG_SHOW_NEWLINE;
+ }
+ printf("Bank %s:\n", bank_name);
+ *flagsp &= ~FLAG_SHOW_BANK;
+ }
+
+ ret = gpio_get_status(dev, offset, buf, sizeof(buf));
+ if (ret)
+ goto err;
+
+ printf("%s\n", buf);
+ return;
+err:
+ printf("Error %d\n", ret);
+}
+
+static int do_gpio_status(bool all, const char *gpio_name)
+{
+ struct udevice *dev;
+ int banklen;
+ int flags;
+ int ret;
+
+ flags = 0;
+ 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;
+
+ flags |= FLAG_SHOW_BANK;
+ if (all)
+ flags |= FLAG_SHOW_ALL;
+ bank_name = gpio_get_bank_info(dev, &num_bits);
+ if (!num_bits) {
+ debug("GPIO device %s has no bits\n", dev->name);
+ continue;
+ }
+ banklen = bank_name ? strlen(bank_name) : 0;
+
+ if (!gpio_name || !bank_name ||
+ !strncmp(gpio_name, bank_name, banklen)) {
+ const char *p = NULL;
+ int offset;
+
+ p = gpio_name + banklen;
+ if (gpio_name && *p) {
+ offset = simple_strtoul(p, NULL, 10);
+ gpio_get_description(dev, bank_name, offset,
+ &flags);
+ } else {
+ for (offset = 0; offset < num_bits; offset++) {
+ gpio_get_description(dev, bank_name,
+ offset, &flags);
+ }
+ }
+ }
+ /* Add a newline between bank names */
+ if (!(flags & FLAG_SHOW_BANK))
+ flags |= FLAG_SHOW_NEWLINE;
+ }
+
+ 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;
+ int ret;
+#ifdef CONFIG_DM_GPIO
+ bool all = false;
+#endif
+
+ if (argc < 2)
+ show_usage:
+ return CMD_RET_USAGE;
+ str_cmd = argv[1];
+ argc -= 2;
+ argv += 2;
+#ifdef CONFIG_DM_GPIO
+ if (argc > 0 && !strcmp(*argv, "-a")) {
+ all = true;
+ argc--;
+ argv++;
+ }
+#endif
+ if (argc > 0)
+ str_gpio = *argv;
+ if (!strncmp(str_cmd, "status", 1)) {
+ /* Support deprecated gpio_status() */
+#ifdef gpio_status
+ gpio_status();
+ return 0;
+#elif defined(CONFIG_DM_GPIO)
+ return cmd_process_error(cmdtp, do_gpio_status(all, 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) {
+ printf("GPIO: '%s' not found\n", str_gpio);
+ 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 */
+ ret = gpio_request(gpio, "cmd_gpio");
+ if (ret && ret != -EBUSY) {
+ 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);
+
+ if (ret != -EBUSY)
+ gpio_free(gpio);
+
+ return value;
+}
+
+U_BOOT_CMD(gpio, 4, 0, do_gpio,
+ "query and control gpio pins",
+ "<input|set|clear|toggle> <pin>\n"
+ " - input/set/clear/toggle the specified pin\n"
+ "gpio status [-a] [<bank> | <pin>] - show [all/claimed] GPIOs");