u-boot/cmd/gpio.c
Simon Glass 48ca690917 gpio: Use case-insentive matching on the GPIO name
Allow the 'gpio' command to match GPIO bank names regardless of the case
of each. While these are generally in upper case, it is useful to be able
to provide lower case with the command.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2019-02-20 15:25:28 +08:00

249 lines
5.3 KiB
C

/*
* 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 {
GPIOC_INPUT,
GPIOC_SET,
GPIOC_CLEAR,
GPIOC_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, bool show_all)
{
char buf[80];
int ret;
ret = gpio_get_function(dev, offset, NULL);
if (ret < 0)
goto err;
if (!show_all && !(*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 ||
!strncasecmp(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, true);
} else {
for (offset = 0; offset < num_bits; offset++) {
gpio_get_description(dev, bank_name,
offset, &flags, false);
}
}
}
/* 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;
int 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", 2)) {
/* 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 = GPIOC_INPUT;
break;
case 's':
sub_cmd = GPIOC_SET;
break;
case 'c':
sub_cmd = GPIOC_CLEAR;
break;
case 't':
sub_cmd = GPIOC_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 == GPIOC_INPUT) {
gpio_direction_input(gpio);
value = gpio_get_value(gpio);
} else {
switch (sub_cmd) {
case GPIOC_SET:
value = 1;
break;
case GPIOC_CLEAR:
value = 0;
break;
case GPIOC_TOGGLE:
value = gpio_get_value(gpio);
if (!IS_ERR_VALUE(value))
value = !value;
break;
default:
goto show_usage;
}
gpio_direction_output(gpio, value);
}
printf("gpio: pin %s (gpio %u) value is ", str_gpio, gpio);
if (IS_ERR_VALUE(value))
printf("unknown (ret=%d)\n", value);
else
printf("%d\n", value);
if (sub_cmd != GPIOC_INPUT && !IS_ERR_VALUE(value)) {
int nval = gpio_get_value(gpio);
if (IS_ERR_VALUE(nval))
printf(" Warning: no access to GPIO output value\n");
else if (nval != value)
printf(" Warning: value of pin is still %d\n", nval);
}
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");