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u-boot-brain/drivers/gpio/gpio-uclass.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2013 Google, Inc
*/
#include <common.h>
#include <dm.h>
#include <log.h>
#include <dm/devres.h>
#include <dm/device_compat.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/uclass-internal.h>
#include <dt-bindings/gpio/gpio.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
#include <acpi/acpi_device.h>
#include <asm/gpio.h>
#include <dm/device_compat.h>
#include <linux/bug.h>
#include <linux/ctype.h>
DECLARE_GLOBAL_DATA_PTR;
/**
* gpio_desc_init() - Initialize the GPIO descriptor
*
* @desc: GPIO descriptor to initialize
* @dev: GPIO device
* @offset: Offset of device GPIO
*/
static void gpio_desc_init(struct gpio_desc *desc,
struct udevice *dev,
uint offset)
{
desc->dev = dev;
desc->offset = offset;
desc->flags = 0;
}
/**
* gpio_to_device() - Convert global GPIO number to device, number
*
* Convert the GPIO number to an entry in the list of GPIOs
* or GPIO blocks registered with the GPIO controller. Returns
* entry on success, NULL on error.
*
* @gpio: The numeric representation of the GPIO
* @desc: Returns description (desc->flags will always be 0)
* @return 0 if found, -ENOENT if not found
*/
static int gpio_to_device(unsigned int gpio, struct gpio_desc *desc)
{
struct gpio_dev_priv *uc_priv;
struct udevice *dev;
int ret;
for (ret = uclass_first_device(UCLASS_GPIO, &dev);
dev;
ret = uclass_next_device(&dev)) {
uc_priv = dev_get_uclass_priv(dev);
if (gpio >= uc_priv->gpio_base &&
gpio < uc_priv->gpio_base + uc_priv->gpio_count) {
gpio_desc_init(desc, dev, gpio - uc_priv->gpio_base);
return 0;
}
}
/* No such GPIO */
return ret ? ret : -ENOENT;
}
#if CONFIG_IS_ENABLED(DM_GPIO_LOOKUP_LABEL)
/**
* dm_gpio_lookup_label() - look for name in gpio device
*
* search in uc_priv, if there is a gpio with labelname same
* as name.
*
* @name: name which is searched
* @uc_priv: gpio_dev_priv pointer.
* @offset: gpio offset within the device
* @return: 0 if found, -ENOENT if not.
*/
static int dm_gpio_lookup_label(const char *name,
struct gpio_dev_priv *uc_priv, ulong *offset)
{
int len;
int i;
*offset = -1;
len = strlen(name);
for (i = 0; i < uc_priv->gpio_count; i++) {
if (!uc_priv->name[i])
continue;
if (!strncmp(name, uc_priv->name[i], len)) {
*offset = i;
return 0;
}
}
return -ENOENT;
}
#else
static int
dm_gpio_lookup_label(const char *name, struct gpio_dev_priv *uc_priv,
ulong *offset)
{
return -ENOENT;
}
#endif
int dm_gpio_lookup_name(const char *name, struct gpio_desc *desc)
{
struct gpio_dev_priv *uc_priv = NULL;
struct udevice *dev;
ulong offset;
int numeric;
int ret;
numeric = isdigit(*name) ? simple_strtoul(name, NULL, 10) : -1;
for (ret = uclass_first_device(UCLASS_GPIO, &dev);
dev;
ret = uclass_next_device(&dev)) {
int len;
uc_priv = dev_get_uclass_priv(dev);
if (numeric != -1) {
offset = numeric - uc_priv->gpio_base;
/* Allow GPIOs to be numbered from 0 */
if (offset < uc_priv->gpio_count)
break;
}
len = uc_priv->bank_name ? strlen(uc_priv->bank_name) : 0;
if (!strncasecmp(name, uc_priv->bank_name, len)) {
if (!strict_strtoul(name + len, 10, &offset))
break;
}
/*
* if we did not found a gpio through its bank
* name, we search for a valid gpio label.
*/
if (!dm_gpio_lookup_label(name, uc_priv, &offset))
break;
}
if (!dev)
return ret ? ret : -EINVAL;
gpio_desc_init(desc, dev, offset);
return 0;
}
int gpio_lookup_name(const char *name, struct udevice **devp,
unsigned int *offsetp, unsigned int *gpiop)
{
struct gpio_desc desc;
int ret;
if (devp)
*devp = NULL;
ret = dm_gpio_lookup_name(name, &desc);
if (ret)
return ret;
if (devp)
*devp = desc.dev;
if (offsetp)
*offsetp = desc.offset;
if (gpiop) {
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(desc.dev);
*gpiop = uc_priv->gpio_base + desc.offset;
}
return 0;
}
int gpio_xlate_offs_flags(struct udevice *dev, struct gpio_desc *desc,
struct ofnode_phandle_args *args)
{
if (args->args_count < 1)
return -EINVAL;
desc->offset = args->args[0];
if (args->args_count < 2)
return 0;
desc->flags = 0;
if (args->args[1] & GPIO_ACTIVE_LOW)
desc->flags |= GPIOD_ACTIVE_LOW;
/*
* need to test 2 bits for gpio output binding:
* OPEN_DRAIN (0x6) = SINGLE_ENDED (0x2) | LINE_OPEN_DRAIN (0x4)
* OPEN_SOURCE (0x2) = SINGLE_ENDED (0x2) | LINE_OPEN_SOURCE (0x0)
*/
if (args->args[1] & GPIO_SINGLE_ENDED) {
if (args->args[1] & GPIO_LINE_OPEN_DRAIN)
desc->flags |= GPIOD_OPEN_DRAIN;
else
desc->flags |= GPIOD_OPEN_SOURCE;
}
if (args->args[1] & GPIO_PULL_UP)
desc->flags |= GPIOD_PULL_UP;
if (args->args[1] & GPIO_PULL_DOWN)
desc->flags |= GPIOD_PULL_DOWN;
return 0;
}
static int gpio_find_and_xlate(struct gpio_desc *desc,
struct ofnode_phandle_args *args)
{
struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);
if (ops->xlate)
return ops->xlate(desc->dev, desc, args);
else
return gpio_xlate_offs_flags(desc->dev, desc, args);
}
#if defined(CONFIG_GPIO_HOG)
struct gpio_hog_priv {
struct gpio_desc gpiod;
};
struct gpio_hog_data {
int gpiod_flags;
int value;
u32 val[2];
};
static int gpio_hog_of_to_plat(struct udevice *dev)
{
struct gpio_hog_data *plat = dev_get_plat(dev);
const char *nodename;
int ret;
plat->value = 0;
if (dev_read_bool(dev, "input")) {
plat->gpiod_flags = GPIOD_IS_IN;
} else if (dev_read_bool(dev, "output-high")) {
plat->value = 1;
plat->gpiod_flags = GPIOD_IS_OUT;
} else if (dev_read_bool(dev, "output-low")) {
plat->gpiod_flags = GPIOD_IS_OUT;
} else {
printf("%s: missing gpio-hog state.\n", __func__);
return -EINVAL;
}
ret = dev_read_u32_array(dev, "gpios", plat->val, 2);
if (ret) {
printf("%s: wrong gpios property, 2 values needed %d\n",
__func__, ret);
return ret;
}
nodename = dev_read_string(dev, "line-name");
if (nodename)
device_set_name(dev, nodename);
return 0;
}
static int gpio_hog_probe(struct udevice *dev)
{
struct gpio_hog_data *plat = dev_get_plat(dev);
struct gpio_hog_priv *priv = dev_get_priv(dev);
int ret;
ret = gpio_dev_request_index(dev->parent, dev->name, "gpio-hog",
plat->val[0], plat->gpiod_flags,
plat->val[1], &priv->gpiod);
if (ret < 0) {
debug("%s: node %s could not get gpio.\n", __func__,
dev->name);
return ret;
}
if (plat->gpiod_flags == GPIOD_IS_OUT) {
ret = dm_gpio_set_value(&priv->gpiod, plat->value);
if (ret < 0) {
debug("%s: node %s could not set gpio.\n", __func__,
dev->name);
return ret;
}
}
return 0;
}
int gpio_hog_probe_all(void)
{
struct udevice *dev;
int ret;
int retval = 0;
for (uclass_first_device(UCLASS_NOP, &dev);
dev;
uclass_find_next_device(&dev)) {
if (dev->driver == DM_GET_DRIVER(gpio_hog)) {
ret = device_probe(dev);
if (ret) {
printf("Failed to probe device %s err: %d\n",
dev->name, ret);
retval = ret;
}
}
}
return retval;
}
int gpio_hog_lookup_name(const char *name, struct gpio_desc **desc)
{
struct udevice *dev;
*desc = NULL;
gpio_hog_probe_all();
if (!uclass_get_device_by_name(UCLASS_NOP, name, &dev)) {
struct gpio_hog_priv *priv = dev_get_priv(dev);
*desc = &priv->gpiod;
return 0;
}
return -ENODEV;
}
U_BOOT_DRIVER(gpio_hog) = {
.name = "gpio_hog",
.id = UCLASS_NOP,
.of_to_plat = gpio_hog_of_to_plat,
.probe = gpio_hog_probe,
.priv_auto = sizeof(struct gpio_hog_priv),
.plat_auto = sizeof(struct gpio_hog_data),
};
#else
int gpio_hog_lookup_name(const char *name, struct gpio_desc **desc)
{
return 0;
}
#endif
int dm_gpio_request(struct gpio_desc *desc, const char *label)
{
struct udevice *dev = desc->dev;
struct gpio_dev_priv *uc_priv;
char *str;
int ret;
uc_priv = dev_get_uclass_priv(dev);
if (uc_priv->name[desc->offset])
return -EBUSY;
str = strdup(label);
if (!str)
return -ENOMEM;
if (gpio_get_ops(dev)->request) {
ret = gpio_get_ops(dev)->request(dev, desc->offset, label);
if (ret) {
free(str);
return ret;
}
}
uc_priv->name[desc->offset] = str;
return 0;
}
static int dm_gpio_requestf(struct gpio_desc *desc, const char *fmt, ...)
{
#if !defined(CONFIG_SPL_BUILD) || !CONFIG_IS_ENABLED(USE_TINY_PRINTF)
va_list args;
char buf[40];
va_start(args, fmt);
vscnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
return dm_gpio_request(desc, buf);
#else
return dm_gpio_request(desc, fmt);
#endif
}
/**
* gpio_request() - [COMPAT] Request GPIO
* gpio: GPIO number
* label: Name for the requested GPIO
*
* The label is copied and allocated so the caller does not need to keep
* the pointer around.
*
* This function implements the API that's compatible with current
* GPIO API used in U-Boot. The request is forwarded to particular
* GPIO driver. Returns 0 on success, negative value on error.
*/
int gpio_request(unsigned gpio, const char *label)
{
struct gpio_desc desc;
int ret;
ret = gpio_to_device(gpio, &desc);
if (ret)
return ret;
return dm_gpio_request(&desc, label);
}
/**
* gpio_requestf() - [COMPAT] Request GPIO
* @gpio: GPIO number
* @fmt: Format string for the requested GPIO
* @...: Arguments for the printf() format string
*
* This function implements the API that's compatible with current
* GPIO API used in U-Boot. The request is forwarded to particular
* GPIO driver. Returns 0 on success, negative value on error.
*/
int gpio_requestf(unsigned gpio, const char *fmt, ...)
{
#if !defined(CONFIG_SPL_BUILD) || !CONFIG_IS_ENABLED(USE_TINY_PRINTF)
va_list args;
char buf[40];
va_start(args, fmt);
vscnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
return gpio_request(gpio, buf);
#else
return gpio_request(gpio, fmt);
#endif
}
int _dm_gpio_free(struct udevice *dev, uint offset)
{
struct gpio_dev_priv *uc_priv;
int ret;
uc_priv = dev_get_uclass_priv(dev);
if (!uc_priv->name[offset])
return -ENXIO;
if (gpio_get_ops(dev)->rfree) {
ret = gpio_get_ops(dev)->rfree(dev, offset);
if (ret)
return ret;
}
free(uc_priv->name[offset]);
uc_priv->name[offset] = NULL;
return 0;
}
/**
* gpio_free() - [COMPAT] Relinquish GPIO
* gpio: GPIO number
*
* This function implements the API that's compatible with current
* GPIO API used in U-Boot. The request is forwarded to particular
* GPIO driver. Returns 0 on success, negative value on error.
*/
int gpio_free(unsigned gpio)
{
struct gpio_desc desc;
int ret;
ret = gpio_to_device(gpio, &desc);
if (ret)
return ret;
return _dm_gpio_free(desc.dev, desc.offset);
}
static int check_reserved(const struct gpio_desc *desc, const char *func)
{
struct gpio_dev_priv *uc_priv;
if (!dm_gpio_is_valid(desc))
return -ENOENT;
uc_priv = dev_get_uclass_priv(desc->dev);
if (!uc_priv->name[desc->offset]) {
printf("%s: %s: error: gpio %s%d not reserved\n",
desc->dev->name, func,
uc_priv->bank_name ? uc_priv->bank_name : "",
desc->offset);
return -EBUSY;
}
return 0;
}
/**
* gpio_direction_input() - [COMPAT] Set GPIO direction to input
* gpio: GPIO number
*
* This function implements the API that's compatible with current
* GPIO API used in U-Boot. The request is forwarded to particular
* GPIO driver. Returns 0 on success, negative value on error.
*/
int gpio_direction_input(unsigned gpio)
{
struct gpio_desc desc;
int ret;
ret = gpio_to_device(gpio, &desc);
if (ret)
return ret;
ret = check_reserved(&desc, "dir_input");
if (ret)
return ret;
return gpio_get_ops(desc.dev)->direction_input(desc.dev, desc.offset);
}
/**
* gpio_direction_output() - [COMPAT] Set GPIO direction to output and set value
* gpio: GPIO number
* value: Logical value to be set on the GPIO pin
*
* This function implements the API that's compatible with current
* GPIO API used in U-Boot. The request is forwarded to particular
* GPIO driver. Returns 0 on success, negative value on error.
*/
int gpio_direction_output(unsigned gpio, int value)
{
struct gpio_desc desc;
int ret;
ret = gpio_to_device(gpio, &desc);
if (ret)
return ret;
ret = check_reserved(&desc, "dir_output");
if (ret)
return ret;
return gpio_get_ops(desc.dev)->direction_output(desc.dev,
desc.offset, value);
}
static int _gpio_get_value(const struct gpio_desc *desc)
{
int value;
value = gpio_get_ops(desc->dev)->get_value(desc->dev, desc->offset);
return desc->flags & GPIOD_ACTIVE_LOW ? !value : value;
}
int dm_gpio_get_value(const struct gpio_desc *desc)
{
int ret;
ret = check_reserved(desc, "get_value");
if (ret)
return ret;
return _gpio_get_value(desc);
}
int dm_gpio_set_value(const struct gpio_desc *desc, int value)
{
int ret;
ret = check_reserved(desc, "set_value");
if (ret)
return ret;
if (desc->flags & GPIOD_ACTIVE_LOW)
value = !value;
/*
* Emulate open drain by not actively driving the line high or
* Emulate open source by not actively driving the line low
*/
if ((desc->flags & GPIOD_OPEN_DRAIN && value) ||
(desc->flags & GPIOD_OPEN_SOURCE && !value))
return gpio_get_ops(desc->dev)->direction_input(desc->dev,
desc->offset);
else if (desc->flags & GPIOD_OPEN_DRAIN ||
desc->flags & GPIOD_OPEN_SOURCE)
return gpio_get_ops(desc->dev)->direction_output(desc->dev,
desc->offset,
value);
gpio_get_ops(desc->dev)->set_value(desc->dev, desc->offset, value);
return 0;
}
/* check dir flags invalid configuration */
static int check_dir_flags(ulong flags)
{
if ((flags & GPIOD_IS_OUT) && (flags & GPIOD_IS_IN)) {
log_debug("%s: flags 0x%lx has GPIOD_IS_OUT and GPIOD_IS_IN\n",
__func__, flags);
return -EINVAL;
}
if ((flags & GPIOD_PULL_UP) && (flags & GPIOD_PULL_DOWN)) {
log_debug("%s: flags 0x%lx has GPIOD_PULL_UP and GPIOD_PULL_DOWN\n",
__func__, flags);
return -EINVAL;
}
if ((flags & GPIOD_OPEN_DRAIN) && (flags & GPIOD_OPEN_SOURCE)) {
log_debug("%s: flags 0x%lx has GPIOD_OPEN_DRAIN and GPIOD_OPEN_SOURCE\n",
__func__, flags);
return -EINVAL;
}
return 0;
}
static int _dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
{
struct udevice *dev = desc->dev;
struct dm_gpio_ops *ops = gpio_get_ops(dev);
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
int ret = 0;
ret = check_dir_flags(flags);
if (ret) {
dev_dbg(dev,
"%s error: set_dir_flags for gpio %s%d has invalid dir flags 0x%lx\n",
desc->dev->name,
uc_priv->bank_name ? uc_priv->bank_name : "",
desc->offset, flags);
return ret;
}
/* GPIOD_ are directly managed by driver in set_dir_flags*/
if (ops->set_dir_flags) {
ret = ops->set_dir_flags(dev, desc->offset, flags);
} else {
if (flags & GPIOD_IS_OUT) {
ret = ops->direction_output(dev, desc->offset,
GPIOD_FLAGS_OUTPUT(flags));
} else if (flags & GPIOD_IS_IN) {
ret = ops->direction_input(dev, desc->offset);
}
}
/* save the flags also in descriptor */
if (!ret)
desc->flags = flags;
return ret;
}
int dm_gpio_set_dir_flags(struct gpio_desc *desc, ulong flags)
{
int ret;
ret = check_reserved(desc, "set_dir_flags");
if (ret)
return ret;
/* combine the requested flags (for IN/OUT) and the descriptor flags */
flags |= desc->flags;
ret = _dm_gpio_set_dir_flags(desc, flags);
return ret;
}
int dm_gpio_set_dir(struct gpio_desc *desc)
{
int ret;
ret = check_reserved(desc, "set_dir");
if (ret)
return ret;
return _dm_gpio_set_dir_flags(desc, desc->flags);
}
int dm_gpio_get_dir_flags(struct gpio_desc *desc, ulong *flags)
{
struct udevice *dev = desc->dev;
int ret, value;
struct dm_gpio_ops *ops = gpio_get_ops(dev);
ulong dir_flags;
ret = check_reserved(desc, "get_dir_flags");
if (ret)
return ret;
/* GPIOD_ are directly provided by driver except GPIOD_ACTIVE_LOW */
if (ops->get_dir_flags) {
ret = ops->get_dir_flags(dev, desc->offset, &dir_flags);
if (ret)
return ret;
/* GPIOD_ACTIVE_LOW is saved in desc->flags */
value = dir_flags & GPIOD_IS_OUT_ACTIVE ? 1 : 0;
if (desc->flags & GPIOD_ACTIVE_LOW)
value = !value;
dir_flags &= ~(GPIOD_ACTIVE_LOW | GPIOD_IS_OUT_ACTIVE);
dir_flags |= (desc->flags & GPIOD_ACTIVE_LOW);
if (value)
dir_flags |= GPIOD_IS_OUT_ACTIVE;
} else {
dir_flags = desc->flags;
/* only GPIOD_IS_OUT_ACTIVE is provided by uclass */
dir_flags &= ~GPIOD_IS_OUT_ACTIVE;
if ((desc->flags & GPIOD_IS_OUT) && _gpio_get_value(desc))
dir_flags |= GPIOD_IS_OUT_ACTIVE;
}
*flags = dir_flags;
return 0;
}
/**
* gpio_get_value() - [COMPAT] Sample GPIO pin and return it's value
* gpio: GPIO number
*
* This function implements the API that's compatible with current
* GPIO API used in U-Boot. The request is forwarded to particular
* GPIO driver. Returns the value of the GPIO pin, or negative value
* on error.
*/
int gpio_get_value(unsigned gpio)
{
int ret;
struct gpio_desc desc;
ret = gpio_to_device(gpio, &desc);
if (ret)
return ret;
return dm_gpio_get_value(&desc);
}
/**
* gpio_set_value() - [COMPAT] Configure logical value on GPIO pin
* gpio: GPIO number
* value: Logical value to be set on the GPIO pin.
*
* This function implements the API that's compatible with current
* GPIO API used in U-Boot. The request is forwarded to particular
* GPIO driver. Returns 0 on success, negative value on error.
*/
int gpio_set_value(unsigned gpio, int value)
{
struct gpio_desc desc;
int ret;
ret = gpio_to_device(gpio, &desc);
if (ret)
return ret;
return dm_gpio_set_value(&desc, value);
}
const char *gpio_get_bank_info(struct udevice *dev, int *bit_count)
{
struct gpio_dev_priv *priv;
/* Must be called on an active device */
priv = dev_get_uclass_priv(dev);
assert(priv);
*bit_count = priv->gpio_count;
return priv->bank_name;
}
static const char * const gpio_function[GPIOF_COUNT] = {
"input",
"output",
"unused",
"unknown",
"func",
};
static int get_function(struct udevice *dev, int offset, bool skip_unused,
const char **namep)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
struct dm_gpio_ops *ops = gpio_get_ops(dev);
BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function));
if (!device_active(dev))
return -ENODEV;
if (offset < 0 || offset >= uc_priv->gpio_count)
return -EINVAL;
if (namep)
*namep = uc_priv->name[offset];
if (skip_unused && !uc_priv->name[offset])
return GPIOF_UNUSED;
if (ops->get_function) {
int ret;
ret = ops->get_function(dev, offset);
if (ret < 0)
return ret;
if (ret >= ARRAY_SIZE(gpio_function))
return -ENODATA;
return ret;
}
return GPIOF_UNKNOWN;
}
int gpio_get_function(struct udevice *dev, int offset, const char **namep)
{
return get_function(dev, offset, true, namep);
}
int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep)
{
return get_function(dev, offset, false, namep);
}
int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize)
{
struct dm_gpio_ops *ops = gpio_get_ops(dev);
struct gpio_dev_priv *priv;
char *str = buf;
int func;
int ret;
int len;
BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function));
*buf = 0;
priv = dev_get_uclass_priv(dev);
ret = gpio_get_raw_function(dev, offset, NULL);
if (ret < 0)
return ret;
func = ret;
len = snprintf(str, buffsize, "%s%d: %s",
priv->bank_name ? priv->bank_name : "",
offset, gpio_function[func]);
if (func == GPIOF_INPUT || func == GPIOF_OUTPUT ||
func == GPIOF_UNUSED) {
const char *label;
bool used;
ret = ops->get_value(dev, offset);
if (ret < 0)
return ret;
used = gpio_get_function(dev, offset, &label) != GPIOF_UNUSED;
snprintf(str + len, buffsize - len, ": %d [%c]%s%s",
ret,
used ? 'x' : ' ',
used ? " " : "",
label ? label : "");
}
return 0;
}
#if CONFIG_IS_ENABLED(ACPIGEN)
int gpio_get_acpi(const struct gpio_desc *desc, struct acpi_gpio *gpio)
{
struct dm_gpio_ops *ops;
memset(gpio, '\0', sizeof(*gpio));
if (!dm_gpio_is_valid(desc)) {
/* Indicate that the GPIO is not valid */
gpio->pin_count = 0;
gpio->pins[0] = 0;
return -EINVAL;
}
ops = gpio_get_ops(desc->dev);
if (!ops->get_acpi)
return -ENOSYS;
return ops->get_acpi(desc, gpio);
}
#endif
int gpio_claim_vector(const int *gpio_num_array, const char *fmt)
{
int i, ret;
int gpio;
for (i = 0; i < 32; i++) {
gpio = gpio_num_array[i];
if (gpio == -1)
break;
ret = gpio_requestf(gpio, fmt, i);
if (ret)
goto err;
ret = gpio_direction_input(gpio);
if (ret) {
gpio_free(gpio);
goto err;
}
}
return 0;
err:
for (i--; i >= 0; i--)
gpio_free(gpio_num_array[i]);
return ret;
}
/*
* get a number comprised of multiple GPIO values. gpio_num_array points to
* the array of gpio pin numbers to scan, terminated by -1.
*/
int gpio_get_values_as_int(const int *gpio_list)
{
int gpio;
unsigned bitmask = 1;
unsigned vector = 0;
int ret;
while (bitmask &&
((gpio = *gpio_list++) != -1)) {
ret = gpio_get_value(gpio);
if (ret < 0)
return ret;
else if (ret)
vector |= bitmask;
bitmask <<= 1;
}
return vector;
}
int dm_gpio_get_values_as_int(const struct gpio_desc *desc_list, int count)
{
unsigned bitmask = 1;
unsigned vector = 0;
int ret, i;
for (i = 0; i < count; i++) {
ret = dm_gpio_get_value(&desc_list[i]);
if (ret < 0)
return ret;
else if (ret)
vector |= bitmask;
bitmask <<= 1;
}
return vector;
}
/**
* gpio_request_tail: common work for requesting a gpio.
*
* ret: return value from previous work in function which calls
* this function.
* This seems bogus (why calling this function instead not
* calling it and end caller function instead?).
* Because on error in caller function we want to set some
* default values in gpio desc and have a common error
* debug message, which provides this function.
* nodename: Name of node for which gpio gets requested
* used for gpio label name.
* args: pointer to output arguments structure
* list_name: Name of GPIO list
* used for gpio label name.
* index: gpio index in gpio list
* used for gpio label name.
* desc: pointer to gpio descriptor, filled from this
* function.
* flags: gpio flags to use.
* add_index: should index added to gpio label name
* gpio_dev: pointer to gpio device from which the gpio
* will be requested. If NULL try to get the
* gpio device with uclass_get_device_by_ofnode()
*
* return: In error case this function sets default values in
* gpio descriptor, also emmits a debug message.
* On success it returns 0 else the error code from
* function calls, or the error code passed through
* ret to this function.
*
*/
static int gpio_request_tail(int ret, const char *nodename,
struct ofnode_phandle_args *args,
const char *list_name, int index,
struct gpio_desc *desc, int flags,
bool add_index, struct udevice *gpio_dev)
{
gpio_desc_init(desc, gpio_dev, 0);
if (ret)
goto err;
if (!desc->dev) {
ret = uclass_get_device_by_ofnode(UCLASS_GPIO, args->node,
&desc->dev);
if (ret) {
debug("%s: uclass_get_device_by_ofnode failed\n",
__func__);
goto err;
}
}
ret = gpio_find_and_xlate(desc, args);
if (ret) {
debug("%s: gpio_find_and_xlate failed\n", __func__);
goto err;
}
ret = dm_gpio_requestf(desc, add_index ? "%s.%s%d" : "%s.%s",
nodename, list_name, index);
if (ret) {
debug("%s: dm_gpio_requestf failed\n", __func__);
goto err;
}
ret = dm_gpio_set_dir_flags(desc, flags);
if (ret) {
debug("%s: dm_gpio_set_dir failed\n", __func__);
goto err;
}
return 0;
err:
debug("%s: Node '%s', property '%s', failed to request GPIO index %d: %d\n",
__func__, nodename, list_name, index, ret);
return ret;
}
static int _gpio_request_by_name_nodev(ofnode node, const char *list_name,
int index, struct gpio_desc *desc,
int flags, bool add_index)
{
struct ofnode_phandle_args args;
int ret;
ret = ofnode_parse_phandle_with_args(node, list_name, "#gpio-cells", 0,
index, &args);
return gpio_request_tail(ret, ofnode_get_name(node), &args, list_name,
index, desc, flags, add_index, NULL);
}
int gpio_request_by_name_nodev(ofnode node, const char *list_name, int index,
struct gpio_desc *desc, int flags)
{
return _gpio_request_by_name_nodev(node, list_name, index, desc, flags,
index > 0);
}
int gpio_request_by_name(struct udevice *dev, const char *list_name, int index,
struct gpio_desc *desc, int flags)
{
struct ofnode_phandle_args args;
ofnode node;
int ret;
ret = dev_read_phandle_with_args(dev, list_name, "#gpio-cells", 0,
index, &args);
node = dev_ofnode(dev);
return gpio_request_tail(ret, ofnode_get_name(node), &args, list_name,
index, desc, flags, index > 0, NULL);
}
int gpio_request_list_by_name_nodev(ofnode node, const char *list_name,
struct gpio_desc *desc, int max_count,
int flags)
{
int count;
int ret;
for (count = 0; count < max_count; count++) {
ret = _gpio_request_by_name_nodev(node, list_name, count,
&desc[count], flags, true);
if (ret == -ENOENT)
break;
else if (ret)
goto err;
}
/* We ran out of GPIOs in the list */
return count;
err:
gpio_free_list_nodev(desc, count - 1);
return ret;
}
int gpio_request_list_by_name(struct udevice *dev, const char *list_name,
struct gpio_desc *desc, int max_count,
int flags)
{
/*
* This isn't ideal since we don't use dev->name in the debug()
* calls in gpio_request_by_name(), but we can do this until
* gpio_request_list_by_name_nodev() can be dropped.
*/
return gpio_request_list_by_name_nodev(dev_ofnode(dev), list_name, desc,
max_count, flags);
}
int gpio_get_list_count(struct udevice *dev, const char *list_name)
{
int ret;
ret = dev_read_phandle_with_args(dev, list_name, "#gpio-cells", 0, -1,
NULL);
if (ret) {
debug("%s: Node '%s', property '%s', GPIO count failed: %d\n",
__func__, dev->name, list_name, ret);
}
return ret;
}
int dm_gpio_free(struct udevice *dev, struct gpio_desc *desc)
{
/* For now, we don't do any checking of dev */
return _dm_gpio_free(desc->dev, desc->offset);
}
int gpio_free_list(struct udevice *dev, struct gpio_desc *desc, int count)
{
int i;
/* For now, we don't do any checking of dev */
for (i = 0; i < count; i++)
dm_gpio_free(dev, &desc[i]);
return 0;
}
int gpio_free_list_nodev(struct gpio_desc *desc, int count)
{
return gpio_free_list(NULL, desc, count);
}
/* We need to renumber the GPIOs when any driver is probed/removed */
static int gpio_renumber(struct udevice *removed_dev)
{
struct gpio_dev_priv *uc_priv;
struct udevice *dev;
struct uclass *uc;
unsigned base;
int ret;
ret = uclass_get(UCLASS_GPIO, &uc);
if (ret)
return ret;
/* Ensure that we have a base for each bank */
base = 0;
uclass_foreach_dev(dev, uc) {
if (device_active(dev) && dev != removed_dev) {
uc_priv = dev_get_uclass_priv(dev);
uc_priv->gpio_base = base;
base += uc_priv->gpio_count;
}
}
return 0;
}
int gpio_get_number(const struct gpio_desc *desc)
{
struct udevice *dev = desc->dev;
struct gpio_dev_priv *uc_priv;
if (!dev)
return -1;
uc_priv = dev_get_uclass_priv(dev);
return uc_priv->gpio_base + desc->offset;
}
static int gpio_post_probe(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
uc_priv->name = calloc(uc_priv->gpio_count, sizeof(char *));
if (!uc_priv->name)
return -ENOMEM;
return gpio_renumber(NULL);
}
static int gpio_pre_remove(struct udevice *dev)
{
struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
int i;
for (i = 0; i < uc_priv->gpio_count; i++) {
if (uc_priv->name[i])
free(uc_priv->name[i]);
}
free(uc_priv->name);
return gpio_renumber(dev);
}
int gpio_dev_request_index(struct udevice *dev, const char *nodename,
char *list_name, int index, int flags,
int dtflags, struct gpio_desc *desc)
{
struct ofnode_phandle_args args;
args.node = ofnode_null();
args.args_count = 2;
args.args[0] = index;
args.args[1] = dtflags;
return gpio_request_tail(0, nodename, &args, list_name, index, desc,
flags, 0, dev);
}
static void devm_gpiod_release(struct udevice *dev, void *res)
{
dm_gpio_free(dev, res);
}
static int devm_gpiod_match(struct udevice *dev, void *res, void *data)
{
return res == data;
}
struct gpio_desc *devm_gpiod_get_index(struct udevice *dev, const char *id,
unsigned int index, int flags)
{
int rc;
struct gpio_desc *desc;
char *propname;
static const char suffix[] = "-gpios";
propname = malloc(strlen(id) + sizeof(suffix));
if (!propname) {
rc = -ENOMEM;
goto end;
}
strcpy(propname, id);
strcat(propname, suffix);
desc = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc),
__GFP_ZERO);
if (unlikely(!desc)) {
rc = -ENOMEM;
goto end;
}
rc = gpio_request_by_name(dev, propname, index, desc, flags);
end:
if (propname)
free(propname);
if (rc)
return ERR_PTR(rc);
devres_add(dev, desc);
return desc;
}
struct gpio_desc *devm_gpiod_get_index_optional(struct udevice *dev,
const char *id,
unsigned int index,
int flags)
{
struct gpio_desc *desc = devm_gpiod_get_index(dev, id, index, flags);
if (IS_ERR(desc))
return NULL;
return desc;
}
void devm_gpiod_put(struct udevice *dev, struct gpio_desc *desc)
{
int rc;
rc = devres_release(dev, devm_gpiod_release, devm_gpiod_match, desc);
WARN_ON(rc);
}
static int gpio_post_bind(struct udevice *dev)
{
struct udevice *child;
ofnode node;
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
struct dm_gpio_ops *ops = (struct dm_gpio_ops *)device_get_ops(dev);
static int reloc_done;
if (!reloc_done) {
if (ops->request)
ops->request += gd->reloc_off;
if (ops->rfree)
ops->rfree += gd->reloc_off;
if (ops->direction_input)
ops->direction_input += gd->reloc_off;
if (ops->direction_output)
ops->direction_output += gd->reloc_off;
if (ops->get_value)
ops->get_value += gd->reloc_off;
if (ops->set_value)
ops->set_value += gd->reloc_off;
if (ops->get_function)
ops->get_function += gd->reloc_off;
if (ops->xlate)
ops->xlate += gd->reloc_off;
if (ops->set_dir_flags)
ops->set_dir_flags += gd->reloc_off;
if (ops->get_dir_flags)
ops->get_dir_flags += gd->reloc_off;
reloc_done++;
}
#endif
if (IS_ENABLED(CONFIG_GPIO_HOG)) {
dev_for_each_subnode(node, dev) {
if (ofnode_read_bool(node, "gpio-hog")) {
const char *name = ofnode_get_name(node);
int ret;
ret = device_bind_driver_to_node(dev,
"gpio_hog",
name, node,
&child);
if (ret)
return ret;
}
}
}
return 0;
}
UCLASS_DRIVER(gpio) = {
.id = UCLASS_GPIO,
.name = "gpio",
.flags = DM_UC_FLAG_SEQ_ALIAS,
.post_probe = gpio_post_probe,
.post_bind = gpio_post_bind,
.pre_remove = gpio_pre_remove,
.per_device_auto = sizeof(struct gpio_dev_priv),
};
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