gpio: generalize for all generic gpio providers
The Blackfin gpio command isn't terribly Blackfin-specific. So generalize
the few pieces into two new optional helpers:
name_to_gpio() - turn a string name into a GPIO #
gpio_status() - display current pin bindings (think /proc/gpio)
Once these pieces are pulled out, we can relocate the cmd_gpio.c into the
common directory.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/common/Makefile b/common/Makefile
index 26380c6..432a9de 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -98,6 +98,7 @@
ifdef CONFIG_FPGA
COBJS-$(CONFIG_CMD_FPGA) += cmd_fpga.o
endif
+COBJS-$(CONFIG_CMD_GPIO) += cmd_gpio.o
COBJS-$(CONFIG_CMD_I2C) += cmd_i2c.o
COBJS-$(CONFIG_CMD_IDE) += cmd_ide.o
COBJS-$(CONFIG_CMD_IMMAP) += cmd_immap.o
diff --git a/common/cmd_gpio.c b/common/cmd_gpio.c
new file mode 100644
index 0000000..9c9de28
--- /dev/null
+++ b/common/cmd_gpio.c
@@ -0,0 +1,86 @@
+/*
+ * 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 <asm/gpio.h>
+
+#ifndef name_to_gpio
+#define name_to_gpio(name) simple_strtoul(name, NULL, 10)
+#endif
+
+enum gpio_cmd {
+ GPIO_INPUT,
+ GPIO_SET,
+ GPIO_CLEAR,
+ GPIO_TOGGLE,
+};
+
+static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ int gpio;
+ enum gpio_cmd sub_cmd;
+ ulong value;
+ const char *str_cmd, *str_gpio;
+
+#ifdef gpio_status
+ if (argc == 2 && !strcmp(argv[1], "status")) {
+ gpio_status();
+ return 0;
+ }
+#endif
+
+ if (argc != 3)
+ show_usage:
+ return cmd_usage(cmdtp);
+ str_cmd = argv[1];
+ str_gpio = argv[2];
+
+ /* 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;
+ }
+
+ /* turn the gpio name into a gpio number */
+ gpio = name_to_gpio(str_gpio);
+ if (gpio < 0)
+ goto show_usage;
+
+ /* grab the pin before we tweak it */
+ gpio_request(gpio, "cmd_gpio");
+
+ /* 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,
+ "input/set/clear/toggle gpio pins",
+ "<input|set|clear|toggle> <pin>\n"
+ " - input/set/clear/toggle the specified pin");