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Date: Fri, 18 Jan 2013 13:13:01 +0100
From: Stijn Devriendt <highguy@...il.com>
To: Roland Stigge <stigge@...com.de>
Cc: gregkh@...uxfoundation.org, grant.likely@...retlab.ca,
linus.walleij@...aro.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, w.sang@...gutronix.de,
jbe@...gutronix.de, plagnioj@...osoft.com,
broonie@...nsource.wolfsonmicro.com, daniel-gl@....net,
rmallon@...il.com, sr@...x.de, wg@...ndegger.com,
tru@...k-microwave.de, mark.rutland@....com
Subject: Re: [PATCH RESEND 1/6 v13] gpio: Add a block GPIO API to gpiolib
Hi Roland,
This mail has been long overdue due to issues with some internal
permission-tool.
Just to be clear, this is not a competing implementation, it's what we
currently use as-is. I'm just posting this as a reference to see if
perhaps more concepts could be reused. It's based on a 2.6.32 kernel.
It includes:
- labels in sysfs (to provide useful names to userspace)
- gpio group support
- exporting individual/groups of gpios dictated by platform-data or device-tree
- open-drain support (different from mainline)
- examplary support for multi-gpio to pcf8575 driver
- gpio_direction_output_keep() function that prevents toggling when
changing direction
Provided-as-is-by: Stijn Devriendt <sdevrien@...co.com>
---
drivers/gpio/Kconfig | 6 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-export.c | 327 ++++++++++++++
drivers/gpio/gpiolib.c | 1021 ++++++++++++++++++++++++++++++++++++++++---
drivers/gpio/pcf857x.c | 102 ++++-
include/asm-generic/gpio.h | 67 +++
include/linux/gpio-export.h | 64 +++
include/linux/gpio.h | 83 ++++
8 files changed, 1602 insertions(+), 69 deletions(-)
create mode 100644 drivers/gpio/gpio-export.c
create mode 100644 include/linux/gpio-export.h
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 2ad0128..7daf6df 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -48,6 +48,12 @@ config DEBUG_GPIO
slower. The diagnostics help catch the type of setup errors
that are most common when setting up new platforms or boards.
+config GPIO_EXPORT
+ bool "GPIO export driver"
+ depends on GPIO_SYSFS && GPIOLIB
+ help
+ Say Y here to include the GPIO export driver.
+
config GPIO_SYSFS
bool "/sys/class/gpio/... (sysfs interface)"
depends on SYSFS && EXPERIMENTAL
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 00a532c..40b96d7 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -4,6 +4,7 @@ ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG
obj-$(CONFIG_GPIOLIB) += gpiolib.o
+obj-$(CONFIG_GPIO_EXPORT) += gpio-export.o
obj-$(CONFIG_GPIO_ADP5520) += adp5520-gpio.o
obj-$(CONFIG_GPIO_LANGWELL) += langwell_gpio.o
obj-$(CONFIG_GPIO_MAX7301) += max7301.o
diff --git a/drivers/gpio/gpio-export.c b/drivers/gpio/gpio-export.c
new file mode 100644
index 0000000..4ee4fe5
--- /dev/null
+++ b/drivers/gpio/gpio-export.c
@@ -0,0 +1,327 @@
+/* drivers/gpio/gpio-export.c
+ *
+ * Copyright (C) 2011 Stijn Devriendt, Cisco Systems Inc.
+ * Copyright (C) 2011 Eli Steenput, Cisco Systems Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/gpio.h>
+#include <linux/device.h>
+#include <linux/string.h>
+#include <linux/gpio-export.h>
+#include <linux/err.h>
+
+#ifdef CONFIG_OF
+
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+
+#endif
+
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+
+struct gpio_export_priv
+{
+ int count;
+ int gpio_num;
+ struct gpio_group *group;
+ char desc[MAX_GPIO_LABEL_SIZE];
+};
+
+static __devinit int common_gpio_probe(struct mp_gpio_platform_data
*pdata, struct device *dev)
+{
+ int gpio_count = pdata->gpio_count;
+ struct mp_gpio_line *gpio_line;
+ int i;
+ int err = 0;
+ struct gpio_export_priv *priv;
+
+ if (gpio_count <= 0 || gpio_count > 32)
+ return -ENODEV;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->count = gpio_count;
+ strncpy(priv->desc, pdata->desc, MAX_GPIO_LABEL_SIZE);
+ if (gpio_count > 1)
+ {
+ u32 gpio[32];
+ u32 value = pdata->initialvalue;
+ u32 opendrain = 0;
+ for (i = 0; i < gpio_count; ++i)
+ {
+ gpio_line = &pdata->gpio_data[i];
+ gpio[i] = gpio_line->gpio_num;
+ if (gpio_line->active_low)
+ value ^= (1 << i);
+ if (gpio_line->open_drain)
+ opendrain |= (1 << i);
+ }
+
+ priv->group = gpio_group_request(gpio, gpio_count, priv->desc);
+ if (IS_ERR(priv->group))
+ {
+ dev_err(dev, "Could not request gpio-group: %ld\n", PTR_ERR(priv->group));
+ err = PTR_ERR(priv->group);
+ goto out_mem;
+ }
+
+ if (opendrain)
+ {
+ err = gpio_group_set_opendrain(priv->group,
gpio_group_value_to_raw(priv->group, opendrain));
+ if (err)
+ {
+ dev_err(dev, "Could not set gpio-group open-drain: %d\n", err);
+ goto out_free_group;
+ }
+ }
+
+ switch (pdata->direction)
+ {
+ case GPIO_INPUT:
+ err = gpio_group_direction_input(priv->group);
+ break;
+ case GPIO_OUTPUT:
+ err = gpio_group_direction_output(priv->group,
gpio_group_value_to_raw(priv->group, value));
+ break;
+ case GPIO_OUTPUT_KEEP:
+ err = gpio_group_direction_output_keep(priv->group);
+ break;
+ default:
+ break;
+ }
+
+ if (err)
+ {
+ dev_err(dev, "Could not set gpio-group direction: %d\n", err);
+ goto out_free_group;
+ }
+
+ err = gpio_group_export(priv->group, pdata->direction == GPIO_CHANGE);
+ if (err)
+ {
+ dev_err(dev, "Could not export gpio-group: %d\n", err);
+ goto out_free_group;
+ }
+ }
+ else
+ {
+ gpio_line = &pdata->gpio_data[0];
+ err = gpio_request(gpio_line->gpio_num, priv->desc);
+ if (err)
+ {
+ dev_err(dev, "Could not request gpio %d\n", gpio_line->gpio_num);
+ goto out_free;
+ }
+ if (gpio_line->open_drain)
+ {
+ err = gpio_set_opendrain(gpio_line->gpio_num, 1);
+ if (err)
+ {
+ dev_warn(dev, "Could not set open-drain on gpio %d\n",
gpio_line->gpio_num);
+ goto out_free;
+ }
+ }
+
+ if (pdata->direction == GPIO_INPUT)
+ {
+ err = gpio_direction_input(gpio_line->gpio_num);
+ }
+ else if (pdata->direction == GPIO_OUTPUT)
+ {
+ int value = 0;
+ value = pdata->initialvalue;
+ if (gpio_line->active_low)
+ value = !value;
+ dev_dbg(dev, "Setting output on gpio %d with value %d\n",
gpio_line->gpio_num, value);
+ err = gpio_direction_output(gpio_line->gpio_num, value);
+ }
+ else if (pdata->direction == GPIO_OUTPUT_KEEP)
+ {
+ err = gpio_direction_output_keep(gpio_line->gpio_num);
+ }
+
+ if (err)
+ {
+ dev_err(dev, "Could not set direction: %d\n", err);
+ goto out_free;
+ }
+
+ err = gpio_export(gpio_line->gpio_num, pdata->direction == GPIO_CHANGE);
+ if (err)
+ {
+ dev_warn(dev, "Could not export gpio %d\n", gpio_line->gpio_num);
+ goto out_free;
+ }
+ priv->gpio_num = gpio_line->gpio_num;
+ }
+ dev_set_drvdata(dev, priv);
+ dev_info(dev, "%s: Exported %d GPIO pins\n", pdata->desc, pdata->gpio_count);
+out:
+ return err;
+out_free:
+ gpio_free(gpio_line->gpio_num);
+ kfree(priv);
+ goto out;
+out_free_group:
+ gpio_group_free(priv->group);
+ kfree(priv);
+ goto out;
+out_mem:
+ kfree(priv);
+ goto out;
+}
+
+int common_gpio_remove(struct device *dev)
+{
+ struct gpio_export_priv *priv = dev_get_drvdata(dev);
+ BUG_ON(!priv);
+
+ if (priv->count == 1)
+ gpio_free(priv->gpio_num);
+ else
+ gpio_group_free(priv->group);
+
+ dev_set_drvdata(dev, NULL);
+ return 0;
+}
+
+#ifdef CONFIG_OF
+
+static __devinit int of_gpio_probe(struct platform_device *of_dev,
+ const struct of_device_id *match)
+{
+ struct device_node *np = of_dev->dev.of_node;
+ int gpio_count = of_gpio_count(np);
+ const char* linuxname = of_get_property(np, "desc", NULL);
+
+ struct mp_gpio_platform_data pdata;
+ struct mp_gpio_line gpio_line[32];
+ int i;
+
+ pdata.gpio_data = gpio_line;
+ pdata.gpio_count = gpio_count;
+ strncpy(pdata.desc, linuxname, MAX_GPIO_LABEL_SIZE);
+ pdata.initialvalue = 0;
+
+ if (of_device_is_compatible(np, "gpio-input"))
+ pdata.direction = GPIO_INPUT;
+ else if (of_device_is_compatible(np, "gpio-output"))
+ {
+ const __be32 *value = of_get_property_u32(np, "initial");
+ if (!value)
+ pdata.direction = GPIO_OUTPUT_KEEP;
+ else
+ {
+ pdata.direction = GPIO_OUTPUT;
+ pdata.initialvalue = be32_to_cpup(value);
+ dev_dbg(&of_dev->dev, "initialvalue=%u, keep=%d\n",
pdata.initialvalue, pdata.direction == GPIO_OUTPUT_KEEP);
+ }
+ }
+ else
+ {
+ pdata.direction = GPIO_CHANGE;
+ }
+
+ for (i=0; i < gpio_count; ++i)
+ {
+ u32 flags;
+ gpio_line[i].gpio_num = of_get_gpio_flags(np, i, &flags);
+ gpio_line[i].active_low = flags & OF_GPIO_ACTIVE_LOW;
+ gpio_line[i].open_drain = flags & OF_GPIO_OPEN_DRAIN;
+ }
+ return common_gpio_probe(&pdata, &of_dev->dev);
+}
+
+static __devexit int of_gpio_remove(struct platform_device *of_dev)
+{
+ return common_gpio_remove(&of_dev->dev);
+}
+
+static const struct of_device_id __devinitconst of_gpio_match[] = {
+ { .compatible = "gpio-input", },
+ { .compatible = "gpio-output", },
+ { .compatible = "gpio-user", },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, of_gpio_match);
+
+static struct of_platform_driver of_gpio_driver = {
+ .probe = of_gpio_probe,
+ .remove = __devexit_p(of_gpio_remove),
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "of-gpio",
+ .of_match_table = of_gpio_match,
+ },
+};
+
+static int __init of_gpio_init(void)
+{
+ // Use i2c_bus_type to support I/O expanders?
+ return of_register_platform_driver(&of_gpio_driver);
+}
+
+static void __exit of_gpio_exit(void)
+{
+ of_unregister_driver(&of_gpio_driver);
+}
+
+late_initcall(of_gpio_init);
+module_exit(of_gpio_exit);
+
+#else
+
+static __devinit int mp_probe(struct platform_device *p_device)
+{
+ return common_gpio_probe(dev_get_platdata(&p_device->dev), &p_device->dev);
+}
+
+static __devexit int mp_remove(struct platform_device *p_device)
+{
+ return common_gpio_remove(&p_device->dev);
+}
+
+static struct platform_device_id mp_id_table[] = {
+ {
+ .name = "gpio-export",
+ },
+};
+
+static struct platform_driver mp_gpio_driver = {
+ .probe = mp_probe,
+ .remove = mp_remove,
+ .id_table = mp_id_table,
+ .driver.name = "gpio-export",
+ .driver.bus = &platform_bus_type,
+ .driver.owner = THIS_MODULE,
+};
+
+static int __init mp_gpio_init(void)
+{
+ return platform_driver_register(&mp_gpio_driver);
+}
+
+static void __exit mp_gpio_exit(void)
+{
+ platform_driver_unregister(&mp_gpio_driver);
+}
+
+late_initcall(mp_gpio_init);
+module_exit(mp_gpio_exit);
+
+#endif
+
+MODULE_AUTHOR("Stijn Devriendt, Eli Steenput");
+MODULE_DESCRIPTION("Multi Purpose GPIO export driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 50de0f5..1c9c426 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -8,7 +8,9 @@
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/gpio.h>
+#include <linux/of_gpio.h>
#include <linux/idr.h>
+#include <linux/ctype.h>
/* Optional implementation infrastructure for GPIO interfaces.
@@ -53,15 +55,15 @@ struct gpio_desc {
#define FLAG_SYSFS 4 /* exported via /sys/class/gpio/control */
#define FLAG_TRIG_FALL 5 /* trigger on falling edge */
#define FLAG_TRIG_RISE 6 /* trigger on rising edge */
+#define FLAG_OPEN_DRAIN 7 /* gpio is open drain */
#define PDESC_ID_SHIFT 16 /* add new flags before this one */
#define GPIO_FLAGS_MASK ((1 << PDESC_ID_SHIFT) - 1)
#define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
-#ifdef CONFIG_DEBUG_FS
const char *label;
-#endif
+ struct gpio_group *group;
};
static struct gpio_desc gpio_desc[ARCH_NR_GPIOS];
@@ -76,9 +78,7 @@ static struct idr pdesc_idr;
static inline void desc_set_label(struct gpio_desc *d, const char *label)
{
-#ifdef CONFIG_DEBUG_FS
d->label = label;
-#endif
}
/* Warn when drivers omit gpio_request() calls -- legal but ill-advised
@@ -119,6 +119,11 @@ static inline struct gpio_chip *gpio_to_chip(unsigned gpio)
return gpio_desc[gpio].chip;
}
+static inline struct gpio_group *gpio_to_group(unsigned gpio)
+{
+ return gpio_desc[gpio].group;
+}
+
/* dynamic allocation of GPIOs, e.g. on a hotplugged device */
static int gpiochip_find_base(int ngpio)
{
@@ -189,6 +194,110 @@ err:
return ret;
}
+/* gpio_group_raw_to_value() - reorder bits according to the gpio group
+ * request
+ *
+ * @group: gpio_group
+ * @raw: raw value
+ *
+ * Returns a compact value representing the gpio_group value.
+ * e.g. consider gpio pins [1,0,2,3] have been requested and their
+ * value is [1,0,0,1] respectively. The raw readout will be 0xA [1,0,1,0]
+ * while the return value of this function will be 0x9, considering
+ * the order of the GPIOs in the group.
+ */
+u32 gpio_group_raw_to_value(const struct gpio_group *group, u32 raw)
+{
+ int i = 0;
+ u32 ret = 0;
+ unsigned base = gpio_to_chip(group->gpios[0])->base;
+
+ while (i < 32 && group->gpios[i] != ARCH_NR_GPIOS)
+ {
+ unsigned offset = group->gpios[i] - base;
+ u32 rawbit = (1 << offset);
+
+ // if raw[offset] is set
+ // then set ret[i]
+ if (raw & rawbit)
+ ret |= (1 << i);
+
+ ++i;
+ }
+ return ret;
+}
+
+/* gpio_group_value_to_raw() - Inverse of gpio_group_raw_to_value
+ *
+ * @group: gpio_group
+ * @raw: compact value
+ *
+ * Returns the raw value.
+ */
+u32 gpio_group_value_to_raw(const struct gpio_group *group, u32 value)
+{
+ int i = 0;
+ u32 raw = 0;
+ unsigned base = gpio_to_chip(group->gpios[0])->base;
+
+ while (i < 32 && group->gpios[i] != ARCH_NR_GPIOS)
+ {
+ unsigned offset = group->gpios[i] - base;
+ u32 rawbit = (1 << offset);
+
+ // if value[i] is set
+ // then set ret[offset]
+ if (value & (1 << i))
+ raw |= rawbit;
+
+ ++i;
+ }
+ return raw;
+}
+
+int gpio_group_test_bit(unsigned long flag, const struct gpio_group *group)
+{
+ u32 set = 0;
+ int i;
+ unsigned base = gpio_to_chip(group->gpios[0])->base;
+ for (i = 0; i < 32; ++i)
+ {
+ if (group->mask & (1 << i) && test_bit(flag, &gpio_desc[base + i].flags))
+ set |= (1 << i);
+ }
+ if (set == 0)
+ return 0;
+ else if (set == group->mask)
+ return 1;
+ else
+ return -EIO;
+}
+
+void gpio_group_set_bit(unsigned long flag, const struct gpio_group *group)
+{
+ int i;
+ unsigned base = gpio_to_chip(group->gpios[0])->base;
+
+ for (i = 0; i < 32; ++i)
+ {
+ if (group->mask & (1 << i))
+ set_bit(flag, &gpio_desc[base + i].flags);
+ }
+}
+
+void gpio_group_clear_bit(unsigned long flag, const struct gpio_group *group)
+{
+ int i;
+ unsigned base = gpio_to_chip(group->gpios[0])->base;
+
+ for (i = 0; i < 32; ++i)
+ {
+ if (group->mask & (1 << i))
+ clear_bit(flag, &gpio_desc[base + i].flags);
+ }
+}
+
+
#ifdef CONFIG_GPIO_SYSFS
/* lock protects against unexport_gpio() being called while
@@ -231,6 +340,30 @@ static ssize_t gpio_direction_show(struct device *dev,
return status;
}
+static ssize_t gpio_group_direction_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ const struct gpio_group *group = dev_get_drvdata(dev);
+ ssize_t status = 0;
+
+ mutex_lock(&sysfs_lock);
+
+ if (gpio_desc[group->gpios[0]].group != group
+ || gpio_group_test_bit(FLAG_EXPORT, group) <= 0)
+ {
+ status = -EIO;
+ goto out;
+ }
+
+ status = gpio_group_test_bit(FLAG_IS_OUT, group);
+ if (status >= 0)
+ status = sprintf(buf, "%s\n", status == 0 ? "in" : "out");
+
+out:
+ mutex_unlock(&sysfs_lock);
+ return status;
+}
+
static ssize_t gpio_direction_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
@@ -255,9 +388,49 @@ static ssize_t gpio_direction_store(struct device *dev,
return status ? : size;
}
-static const DEVICE_ATTR(direction, 0644,
+static ssize_t gpio_group_direction_store(struct device *dev,
+ struct device_attribute *attr, const char* buf, size_t size)
+{
+ const struct gpio_group *group = dev_get_drvdata(dev);
+ ssize_t status;
+ unsigned long input;
+
+ mutex_lock(&sysfs_lock);
+
+ if (gpio_desc[group->gpios[0]].group != group
+ || gpio_group_test_bit(FLAG_EXPORT, group) <= 0)
+ {
+ status = -EIO;
+ goto out;
+ }
+
+ if (sysfs_streq(buf, "in"))
+ status = gpio_group_direction_input(group);
+ else if (sysfs_streq(buf, "out"))
+ status = gpio_group_direction_output(group, 0);
+ else
+ {
+ status = strict_strtoul(buf, 0, &input);
+ if (!status)
+ {
+ if ((input & group->mask) == input)
+ status = gpio_group_direction_output(group, input);
+ else
+ status = -EINVAL;
+ }
+ }
+
+out:
+ mutex_unlock(&sysfs_lock);
+ return status ? : size;
+}
+
+static DEVICE_ATTR(direction, 0644,
gpio_direction_show, gpio_direction_store);
+struct device_attribute dev_attr_direction_group =
+ __ATTR(direction, 0644, gpio_group_direction_show,
gpio_group_direction_store);
+
static ssize_t gpio_value_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -276,6 +449,50 @@ static ssize_t gpio_value_show(struct device *dev,
return status;
}
+static ssize_t gpio_group_value_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ const struct gpio_group *group = dev_get_drvdata(dev);
+ ssize_t status;
+
+ mutex_lock(&sysfs_lock);
+
+ if (gpio_desc[group->gpios[0]].group != group
+ || gpio_group_test_bit(FLAG_EXPORT, group) <= 0)
+ {
+ status = -EIO;
+ goto out;
+ }
+ status = sprintf(buf, "%u\n", gpio_group_raw_to_value(group,
+ gpio_group_get_raw_cansleep(group)));
+
+out:
+ mutex_unlock(&sysfs_lock);
+ return status;
+}
+
+
+static ssize_t gpio_group_raw_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ const struct gpio_group *group = dev_get_drvdata(dev);
+ ssize_t status;
+
+ mutex_lock(&sysfs_lock);
+
+ if (gpio_desc[group->gpios[0]].group != group
+ || gpio_group_test_bit(FLAG_EXPORT, group) <= 0)
+ {
+ status = -EIO;
+ goto out;
+ }
+ status = sprintf(buf, "%u\n", gpio_group_get_raw_cansleep(group));
+
+out:
+ mutex_unlock(&sysfs_lock);
+ return status;
+}
+
static ssize_t gpio_value_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t size)
{
@@ -303,9 +520,96 @@ static ssize_t gpio_value_store(struct device *dev,
return status;
}
+static ssize_t gpio_group_value_store(struct device *dev,
+ struct device_attribute *attr, const char* buf, size_t size)
+{
+ const struct gpio_group *group = dev_get_drvdata(dev);
+ ssize_t status;
+ unsigned long value;
+
+ mutex_lock(&sysfs_lock);
+
+ if (gpio_desc[group->gpios[0]].group != group
+ || gpio_group_test_bit(FLAG_EXPORT, group) <= 0
+ || gpio_group_test_bit(FLAG_IS_OUT, group) <= 0)
+ {
+ status = -EIO;
+ goto out;
+ }
+ status = strict_strtoul(buf, 0, &value);
+ if (status == 0)
+ {
+ gpio_group_set_raw_cansleep(group,
+ gpio_group_value_to_raw(group, value));
+ status = size;
+ }
+
+out:
+ mutex_unlock(&sysfs_lock);
+
+ return status;
+}
+
+static ssize_t gpio_group_raw_store(struct device *dev,
+ struct device_attribute *attr, const char* buf, size_t size)
+{
+ const struct gpio_group *group = dev_get_drvdata(dev);
+ ssize_t status;
+ unsigned long value;
+
+ mutex_lock(&sysfs_lock);
+
+ if (gpio_desc[group->gpios[0]].group != group
+ || gpio_group_test_bit(FLAG_EXPORT, group) <= 0
+ || gpio_group_test_bit(FLAG_IS_OUT, group) <= 0)
+ {
+ status = -EIO;
+ goto out;
+ }
+ status = strict_strtoul(buf, 0, &value);
+ if (status == 0)
+ {
+ gpio_group_set_raw_cansleep(group, value);
+ status = size;
+ }
+
+out:
+ mutex_unlock(&sysfs_lock);
+
+ return status;
+}
+
+static ssize_t gpio_group_mask_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ const struct gpio_group *group = dev_get_drvdata(dev);
+ ssize_t status;
+
+ mutex_lock(&sysfs_lock);
+
+ if (gpio_desc[group->gpios[0]].group != group
+ || gpio_group_test_bit(FLAG_EXPORT, group) <= 0)
+ {
+ status = -EIO;
+ goto out;
+ }
+ status = sprintf(buf, "%u\n", group->mask);
+
+out:
+ mutex_unlock(&sysfs_lock);
+ return status;
+}
+
static /*const*/ DEVICE_ATTR(value, 0644,
gpio_value_show, gpio_value_store);
+struct device_attribute dev_attr_value_group =
+ __ATTR(value, 0644, gpio_group_value_show, gpio_group_value_store);
+
+DEVICE_ATTR(raw, 0644, gpio_group_raw_show, gpio_group_raw_store);
+
+DEVICE_ATTR(mask, 0444, gpio_group_mask_show, NULL);
+
static irqreturn_t gpio_sysfs_irq(int irq, void *priv)
{
struct work_struct *work = priv;
@@ -381,7 +685,7 @@ static int gpio_setup_irq(struct gpio_desc *desc,
struct device *dev,
goto free_id;
}
- pdesc->value_sd = sysfs_get_dirent(dev->kobj.sd, "value");
+ pdesc->value_sd = sysfs_get_dirent(dev->kobj.sd, NULL, "value");
if (!pdesc->value_sd) {
ret = -ENODEV;
goto free_id;
@@ -475,9 +779,55 @@ found:
static DEVICE_ATTR(edge, 0644, gpio_edge_show, gpio_edge_store);
+static ssize_t gpio_label_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ const struct gpio_desc *desc = dev_get_drvdata(dev);
+ ssize_t status = 0;
+
+ mutex_lock(&sysfs_lock);
+
+ if (!test_bit(FLAG_EXPORT, &desc->flags))
+ status = -EIO;
+ else if (desc->label)
+ status = sprintf(buf, "%s\n", desc->label);
+
+ mutex_unlock(&sysfs_lock);
+ return status;
+}
+
+static ssize_t gpio_group_label_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ const struct gpio_group *group = dev_get_drvdata(dev);
+ const struct gpio_desc *desc = &gpio_desc[group->gpios[0]];
+ ssize_t status = 0;
+
+ mutex_lock(&sysfs_lock);
+
+ if (!test_bit(FLAG_EXPORT, &desc->flags))
+ status = -EIO;
+ else if (desc->label)
+ status = sprintf(buf, "%s\n", desc->label);
+
+ mutex_unlock(&sysfs_lock);
+ return status;
+}
+
+static struct device_attribute dev_attr_gpio_label = __ATTR(label,
0444, gpio_label_show, NULL);
+static struct device_attribute dev_attr_gpio_group_label =
__ATTR(label, 0444, gpio_group_label_show, NULL);
+
static const struct attribute *gpio_attrs[] = {
- &dev_attr_direction.attr,
&dev_attr_value.attr,
+ &dev_attr_gpio_label.attr,
+ NULL,
+};
+
+static const struct attribute *gpio_group_attrs[] = {
+ &dev_attr_value_group.attr,
+ &dev_attr_raw.attr,
+ &dev_attr_mask.attr,
+ &dev_attr_gpio_group_label.attr,
NULL,
};
@@ -485,6 +835,10 @@ static const struct attribute_group gpio_attr_group = {
.attrs = (struct attribute **) gpio_attrs,
};
+static const struct attribute_group gpio_group_attr_group = {
+ .attrs = (struct attribute **) gpio_group_attrs,
+};
+
/*
* /sys/class/gpio/gpiochipN/
* /base ... matching gpio_chip.base (N)
@@ -530,6 +884,36 @@ static const struct attribute_group gpiochip_attr_group = {
.attrs = (struct attribute **) gpiochip_attrs,
};
+int read_gpios(const char *buf, size_t len, unsigned *gpios)
+{
+ const char *startp = buf;
+ char *endp = (char*)buf;
+ int i;
+ for (i = 0; i < 32; ++i)
+ {
+ unsigned gpio;
+
+ gpio = simple_strtoul(startp, &endp, 0);
+
+ if (endp == startp)
+ return -EINVAL; // not a number, bail out
+
+ gpios[i] = gpio;
+
+ while (endp - buf < len && isspace(*endp)) // eat whitespace
+ endp++;
+
+
+ if (endp - buf > len) // buffer overrun, should never happen
+ return -EINVAL;
+ else if (endp - buf == len) // end of buffer, return number of read gpios
+ return i+1;
+
+ startp = endp;
+ }
+ return -EINVAL;
+}
+
/*
* /sys/class/gpio/export ... write-only
* integer N ... number of GPIO to export (full access)
@@ -538,10 +922,10 @@ static const struct attribute_group
gpiochip_attr_group = {
*/
static ssize_t export_store(struct class *class, const char *buf, size_t len)
{
- long gpio;
+ unsigned gpio[32];
int status;
- status = strict_strtol(buf, 0, &gpio);
+ status = read_gpios(buf, len, gpio);
if (status < 0)
goto done;
@@ -550,16 +934,41 @@ static ssize_t export_store(struct class *class,
const char *buf, size_t len)
* they may be undone on its behalf too.
*/
- status = gpio_request(gpio, "sysfs");
- if (status < 0)
- goto done;
+ if (status == 1)
+ {
+ status = gpio_request(gpio[0], "sysfs");
+ if (status < 0)
+ goto done;
- status = gpio_export(gpio, true);
- if (status < 0)
- gpio_free(gpio);
+ status = gpio_export(gpio[0], true);
+ if (status < 0)
+ gpio_free(gpio[0]);
+ else
+ set_bit(FLAG_SYSFS, &gpio_desc[gpio[0]].flags);
+ }
else
- set_bit(FLAG_SYSFS, &gpio_desc[gpio].flags);
+ {
+ struct gpio_group *group = gpio_group_request(gpio, status, "sysfs");
+ if (IS_ERR(group))
+ {
+ status = PTR_ERR(group);
+ goto done;
+ }
+ status = gpio_group_export(group, true);
+ if (status < 0)
+ gpio_group_free(group);
+ else
+ {
+ // Lock required to protect against unexport being called
+ // against when only parts of the group have the flag set.
+ // The other cases: all have the flag or none have the flag
+ // are handled correctly.
+ mutex_lock(&sysfs_lock);
+ gpio_group_set_bit(FLAG_SYSFS, group);
+ mutex_unlock(&sysfs_lock);
+ }
+ }
done:
if (status)
pr_debug("%s: status %d\n", __func__, status);
@@ -570,6 +979,7 @@ static ssize_t unexport_store(struct class *class,
const char *buf, size_t len)
{
long gpio;
int status;
+ struct gpio_group *group;
status = strict_strtol(buf, 0, &gpio);
if (status < 0)
@@ -581,13 +991,29 @@ static ssize_t unexport_store(struct class
*class, const char *buf, size_t len)
if (!gpio_is_valid(gpio))
goto done;
- /* No extra locking here; FLAG_SYSFS just signifies that the
- * request and export were done by on behalf of userspace, so
- * they may be undone on its behalf too.
- */
- if (test_and_clear_bit(FLAG_SYSFS, &gpio_desc[gpio].flags)) {
- status = 0;
- gpio_free(gpio);
+ group = gpio_to_group(gpio);
+ if (group)
+ {
+ mutex_lock(&sysfs_lock);
+ if (gpio_group_test_bit(FLAG_SYSFS, group))
+ {
+ status = 0;
+ gpio_group_clear_bit(FLAG_SYSFS, group);
+ }
+ mutex_unlock(&sysfs_lock);
+ if (!status)
+ gpio_group_free(group);
+ }
+ else
+ {
+ /* No extra locking here; FLAG_SYSFS just signifies that the
+ * request and export were done by on behalf of userspace, so
+ * they may be undone on its behalf too.
+ */
+ if (test_and_clear_bit(FLAG_SYSFS, &gpio_desc[gpio].flags)) {
+ status = 0;
+ gpio_free(gpio);
+ }
}
done:
if (status)
@@ -662,12 +1088,11 @@ int gpio_export(unsigned gpio, bool direction_may_change)
dev = device_create(&gpio_class, desc->chip->dev, MKDEV(0, 0),
desc, ioname ? ioname : "gpio%d", gpio);
if (!IS_ERR(dev)) {
- if (direction_may_change)
- status = sysfs_create_group(&dev->kobj,
- &gpio_attr_group);
- else
- status = device_create_file(dev,
- &dev_attr_value);
+ status = sysfs_create_group(&dev->kobj,
+ &gpio_attr_group);
+
+ if (!status && direction_may_change)
+ status = device_create_file(dev, &dev_attr_direction);
if (!status && gpio_to_irq(gpio) >= 0
&& (direction_may_change
@@ -694,6 +1119,72 @@ done:
}
EXPORT_SYMBOL_GPL(gpio_export);
+int gpio_group_export(struct gpio_group *group, bool direction_may_change)
+{
+ unsigned long flags;
+ int status = -EINVAL;
+ struct gpio_chip *chip;
+ unsigned lowest = group->gpios[0];
+ int i;
+
+ /* can't export until sysfs is available ... */
+ if (!gpio_class.p) {
+ pr_debug("%s: called too early!\n", __func__);
+ return -ENOENT;
+ }
+
+ mutex_lock(&sysfs_lock);
+
+ spin_lock_irqsave(&gpio_lock, flags);
+ chip = gpio_to_chip(group->gpios[0]);
+ if (gpio_group_test_bit(FLAG_REQUESTED, group) > 0
+ && gpio_group_test_bit(FLAG_EXPORT, group) == 0)
+ {
+ status = 0;
+ if (!chip->direction_input_multi || !chip->direction_output_multi)
+ {
+ direction_may_change = false;
+ }
+ }
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ if (status == 0)
+ {
+ struct device *dev;
+
+ i=1;
+ while (i < 32 && group->gpios[i] != ARCH_NR_GPIOS)
+ {
+ if (group->gpios[i] < lowest)
+ lowest = group->gpios[i];
+ ++i;
+ }
+
+ dev = device_create(&gpio_class, chip->dev, MKDEV(0, 0),
+ group, "group%d", lowest);
+ if (!IS_ERR(dev)) {
+ status = sysfs_create_group(&dev->kobj, &gpio_group_attr_group);
+
+ if (status == 0 && direction_may_change)
+ status = device_create_file(dev, &dev_attr_direction_group);
+
+ if (status != 0)
+ device_unregister(dev);
+ }
+ else
+ status = PTR_ERR(dev);
+ if (status == 0)
+ gpio_group_set_bit(FLAG_EXPORT, group);
+ }
+ mutex_unlock(&sysfs_lock);
+
+ if (status)
+ pr_debug("%s: group%d status %d\n", __func__, group->gpios[0], status);
+ return status;
+}
+EXPORT_SYMBOL_GPL(gpio_group_export);
+
+
static int match_export(struct device *dev, void *data)
{
return dev_get_drvdata(dev) == data;
@@ -744,6 +1235,30 @@ done:
}
EXPORT_SYMBOL_GPL(gpio_export_link);
+int gpio_group_export_link(struct device *dev, const char *name,
struct gpio_group *group)
+{
+ int status = -EINVAL;
+ mutex_lock(&sysfs_lock);
+ if (gpio_group_test_bit(FLAG_EXPORT, group) == 1)
+ {
+ struct device *tdev;
+
+ tdev = class_find_device(&gpio_class, NULL, group, match_export);
+ if (tdev != NULL) {
+ status = sysfs_create_link(&dev->kobj, &tdev->kobj, name);
+ }
+ else
+ {
+ status = -ENODEV;
+ }
+ }
+ mutex_unlock(&sysfs_lock);
+ if (status)
+ pr_debug("%s: group%d status %d\n", __func__, group->gpios[0], status);
+ return status;
+}
+EXPORT_SYMBOL_GPL(gpio_group_export_link);
+
/**
* gpio_unexport - reverse effect of gpio_export()
* @gpio: gpio to make unavailable
@@ -783,6 +1298,31 @@ done:
}
EXPORT_SYMBOL_GPL(gpio_unexport);
+void gpio_group_unexport(struct gpio_group *group)
+{
+ int status = -EINVAL;
+ mutex_lock(&sysfs_lock);
+
+ if (gpio_group_test_bit(FLAG_EXPORT, group) == 1)
+ {
+ struct device *dev = NULL;
+ dev = class_find_device(&gpio_class, NULL, group, match_export);
+ if (dev)
+ {
+ gpio_group_clear_bit(FLAG_EXPORT, group);
+ put_device(dev);
+ device_unregister(dev);
+ status = 0;
+ }
+ else
+ status = -ENODEV;
+ }
+ mutex_unlock(&sysfs_lock);
+ if (status)
+ pr_debug("%s: group%d status %d\n", __func__, group->gpios[0], status);
+}
+EXPORT_SYMBOL_GPL(gpio_group_unexport);
+
static int gpiochip_export(struct gpio_chip *chip)
{
int status;
@@ -959,6 +1499,8 @@ int gpiochip_add(struct gpio_chip *chip)
}
}
+ of_gpiochip_add(chip);
+
unlock:
spin_unlock_irqrestore(&gpio_lock, flags);
if (status == 0)
@@ -987,6 +1529,8 @@ int gpiochip_remove(struct gpio_chip *chip)
spin_lock_irqsave(&gpio_lock, flags);
+ of_gpiochip_remove(chip);
+
for (id = chip->base; id < chip->base + chip->ngpio; id++) {
if (test_bit(FLAG_REQUESTED, &gpio_desc[id].flags)) {
status = -EBUSY;
@@ -1007,6 +1551,38 @@ int gpiochip_remove(struct gpio_chip *chip)
}
EXPORT_SYMBOL_GPL(gpiochip_remove);
+/**
+ * gpiochip_find() - iterator for locating a specific gpio_chip
+ * @data: data to pass to match function
+ * @callback: Callback function to check gpio_chip
+ *
+ * Similar to bus_find_device. It returns a reference to a gpio_chip as
+ * determined by a user supplied @match callback. The callback should return
+ * 0 if the device doesn't match and non-zero if it does. If the callback is
+ * non-zero, this function will return to the caller and not iterate over any
+ * more gpio_chips.
+ */
+struct gpio_chip *gpiochip_find(void *data,
+ int (*match)(struct gpio_chip *chip, void *data))
+{
+ struct gpio_chip *chip = NULL;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+ for (i = 0; i < ARCH_NR_GPIOS; i++) {
+ if (!gpio_desc[i].chip)
+ continue;
+
+ if (match(gpio_desc[i].chip, data)) {
+ chip = gpio_desc[i].chip;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ return chip;
+}
/* These "optional" allocation calls help prevent drivers from stomping
* on each other, and help provide better diagnostics in debugfs.
@@ -1066,6 +1642,111 @@ done:
}
EXPORT_SYMBOL_GPL(gpio_request);
+struct gpio_group* gpio_group_request(unsigned *gpio, int ngpios,
const char* label)
+{
+ int i;
+ unsigned long flags;
+ u32 mask = 0;
+ struct gpio_chip *chip;
+ int rc = 0;
+ struct gpio_group *group;
+
+ if (ngpios <= 0)
+ return ERR_PTR(-EINVAL);
+
+ group = kzalloc(sizeof(struct gpio_group), GFP_KERNEL);
+ if (!group)
+ return ERR_PTR(-ENOMEM);
+
+ spin_lock_irqsave(&gpio_lock, flags);
+ if (!gpio_is_valid(gpio[0]))
+ {
+ rc = -EINVAL;
+ goto out_free;
+ }
+ chip = gpio_to_chip(gpio[0]);
+ // if not (multi-input or multi-output capable)
+ if (!chip ||
+ !( (chip->get_multi && chip->direction_input_multi)
+ || (chip->set_multi && chip->direction_output_multi))
+ )
+ {
+ rc = -ENODEV;
+ goto out_free;
+ }
+
+ mask |= (1 << (gpio[0] - chip->base));
+ for (i = 1; i < ngpios; ++i)
+ {
+ if (gpio[i] < chip->base || gpio[i] > chip->base + chip->ngpio)
+ {
+ rc = -EINVAL;
+ goto out_free;
+ }
+ mask |= (1 << (gpio[i] - chip->base));
+ }
+
+ if (!try_module_get(chip->owner))
+ {
+ rc = -ENOSYS;
+ goto out_free;
+ }
+
+ group->mask = mask;
+ for (i = 0; i < 32; ++i)
+ {
+ if (i < ngpios)
+ group->gpios[i] = gpio[i];
+ else
+ group->gpios[i] = ARCH_NR_GPIOS;
+ }
+
+ if (gpio_group_test_bit(FLAG_REQUESTED, group) != 0)
+ {
+ rc = -EBUSY;
+ goto out_put;
+ }
+
+ gpio_group_set_bit(FLAG_REQUESTED, group);
+ for (i = 0; i < ngpios; ++i)
+ {
+ gpio_desc[gpio[i]].group = group;
+ desc_set_label(&gpio_desc[gpio[i]], label ? : "?");
+ }
+
+ if (chip->request_multi) {
+ spin_unlock_irqrestore(&gpio_lock, flags);
+ rc = chip->request_multi(chip, mask);
+ spin_lock_irqsave(&gpio_lock, flags);
+ if (rc)
+ goto out_label;
+ }
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+ return group;
+out_label:
+ for (i = 0; i < ngpios; ++i)
+ {
+ desc_set_label(&gpio_desc[gpio[i]], NULL);
+ gpio_desc[gpio[i]].group = NULL;
+ }
+out_put:
+ module_put(chip->owner);
+out_free:
+ spin_unlock_irqrestore(&gpio_lock, flags);
+ kfree(group);
+ pr_debug("%s: group%d (%s) status %d\n", __func__, *gpio, label ? : "?", rc);
+ return ERR_PTR(rc);
+}
+EXPORT_SYMBOL_GPL(gpio_group_request);
+
+struct gpio_group * gpio_get_group(unsigned gpio)
+{
+ if (!gpio_is_valid(gpio))
+ return NULL;
+ return gpio_desc[gpio].group;
+}
+
void gpio_free(unsigned gpio)
{
unsigned long flags;
@@ -1102,6 +1783,45 @@ void gpio_free(unsigned gpio)
}
EXPORT_SYMBOL_GPL(gpio_free);
+void gpio_group_free(struct gpio_group *group)
+{
+ unsigned long flags;
+ struct gpio_chip *chip;
+
+ might_sleep();
+
+ gpio_group_unexport(group);
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ chip = gpio_to_chip(group->gpios[0]);
+ if (chip && gpio_group_test_bit(FLAG_REQUESTED, group))
+ {
+ int i;
+ if (chip->free_multi) {
+ spin_unlock_irqrestore(&gpio_lock, flags);
+ might_sleep_if(extra_checks && chip->can_sleep);
+ chip->free_multi(chip, group->mask);
+ spin_lock_irqsave(&gpio_lock, flags);
+ }
+ for (i = 0; i < 32; ++i)
+ {
+ if (group->mask & (1 << i))
+ {
+ desc_set_label(&gpio_desc[chip->base + i], NULL);
+ gpio_desc[chip->base +i].group = NULL;
+ }
+ module_put(chip->owner);
+ gpio_group_clear_bit(FLAG_REQUESTED, group);
+ }
+ }
+ else
+ WARN_ON(extra_checks);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+ kfree(group);
+}
+EXPORT_SYMBOL_GPL(gpio_group_free);
/**
* gpiochip_is_requested - return string iff signal was requested
@@ -1124,15 +1844,10 @@ const char *gpiochip_is_requested(struct
gpio_chip *chip, unsigned offset)
return NULL;
if (test_bit(FLAG_REQUESTED, &gpio_desc[gpio].flags) == 0)
return NULL;
-#ifdef CONFIG_DEBUG_FS
return gpio_desc[gpio].label;
-#else
- return "?";
-#endif
}
EXPORT_SYMBOL_GPL(gpiochip_is_requested);
-
/* Drivers MUST set GPIO direction before making get/set calls. In
* some cases this is done in early boot, before IRQs are enabled.
*
@@ -1195,6 +1910,25 @@ fail:
}
EXPORT_SYMBOL_GPL(gpio_direction_input);
+
+int gpio_group_direction_input(const struct gpio_group *group)
+{
+ struct gpio_chip *chip = gpio_to_chip(group->gpios[0]);
+ int rc;
+
+ if (!chip->get_multi || !chip->direction_input_multi)
+ return -EINVAL;
+
+ rc = chip->direction_input_multi(chip, group->mask);
+ if (rc == 0)
+ {
+ gpio_group_clear_bit(FLAG_IS_OUT, group);
+ }
+ else
+ pr_debug("%s: group%d status %d\n", __func__, group->gpios[0], rc);
+ return rc;
+}
+
int gpio_direction_output(unsigned gpio, int value)
{
unsigned long flags;
@@ -1248,6 +1982,124 @@ fail:
}
EXPORT_SYMBOL_GPL(gpio_direction_output);
+int gpio_group_direction_output(const struct gpio_group *group, u32 value)
+{
+ struct gpio_chip *chip = gpio_to_chip(group->gpios[0]);
+ int rc;
+
+ if (!chip->set_multi || !chip->direction_output_multi)
+ return -EINVAL;
+
+ rc = chip->direction_output_multi(chip, group->mask, value & group->mask);
+ if (rc == 0)
+ {
+ gpio_group_set_bit(FLAG_IS_OUT, group);
+ }
+ else
+ pr_debug("%s: group%d status %d\n", __func__, group->gpios[0], rc);
+ return rc;
+}
+
+int gpio_set_opendrain(unsigned gpio, int value)
+{
+ unsigned long flags;
+ struct gpio_chip *chip;
+ struct gpio_desc *desc = &gpio_desc[gpio];
+ int status = -EINVAL;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ if (!gpio_is_valid(gpio))
+ goto fail;
+ chip = desc->chip;
+ if (!chip || !chip->set || !chip->direction_output)
+ goto fail;
+ gpio -= chip->base;
+ if (gpio >= chip->ngpio)
+ goto fail;
+ status = gpio_ensure_requested(desc, gpio);
+ if (status < 0)
+ goto fail;
+
+ /* now we know the gpio is valid and chip won't vanish */
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ might_sleep_if(extra_checks && chip->can_sleep);
+
+ if (!chip->set_opendrain)
+ return -ENOSYS;
+
+ if (status) {
+ status = chip->request(chip, gpio);
+ if (status < 0) {
+ pr_debug("GPIO-%d: chip request fail, %d\n",
+ chip->base + gpio, status);
+ /* and it's not available to anyone else ...
+ * gpio_request() is the fully clean solution.
+ */
+ goto lose;
+ }
+ }
+
+ status = chip->set_opendrain(chip, gpio, value);
+ if (status == 0)
+ {
+ if (value)
+ set_bit(FLAG_OPEN_DRAIN, &desc->flags);
+ else
+ clear_bit(FLAG_OPEN_DRAIN, &desc->flags);
+ }
+lose:
+ return status;
+fail:
+ spin_unlock_irqrestore(&gpio_lock, flags);
+ if (status)
+ pr_debug("%s: gpio-%d status %d\n",
+ __func__, gpio, status);
+ return status;
+}
+EXPORT_SYMBOL_GPL(gpio_set_opendrain);
+
+int gpio_group_set_opendrain(struct gpio_group *group, u32 value)
+{
+ struct gpio_chip *chip = gpio_to_chip(group->gpios[0]);
+ int err;
+ if (!chip)
+ return -EINVAL;
+ if (!chip->set_multi || !chip->direction_output_multi)
+ return -EINVAL;
+ if (!chip->set_opendrain_multi)
+ return -ENOSYS;
+
+ might_sleep_if(extra_checks && chip->can_sleep);
+
+ err = chip->set_opendrain_multi(chip, group->mask, value & group->mask);
+ if (err == 0)
+ {
+ int i;
+ unsigned base = chip->base;
+ for (i = 0; i < 32; ++i)
+ {
+ if (group->mask & (1 << i))
+ {
+ if (value & (1 << i))
+ {
+ set_bit(FLAG_OPEN_DRAIN, &gpio_desc[base+i].flags);
+ }
+ else
+ {
+ clear_bit(FLAG_OPEN_DRAIN, &gpio_desc[base+i].flags);
+ }
+ }
+ }
+ }
+ if (err)
+ pr_debug("%s: group%d status %d\n",
+ __func__, group->gpios[0], err);
+ return err;
+}
+EXPORT_SYMBOL_GPL(gpio_group_set_opendrain);
/* I/O calls are only valid after configuration completed; the relevant
* "is this a valid GPIO" error checks should already have been done.
@@ -1290,6 +2142,14 @@ int __gpio_get_value(unsigned gpio)
}
EXPORT_SYMBOL_GPL(__gpio_get_value);
+u32 gpio_group_get_raw(const struct gpio_group* group)
+{
+ struct gpio_chip *chip;
+ chip = gpio_to_chip(group->gpios[0]);
+ return chip->get_multi ? chip->get_multi(chip, group->mask) : 0;
+}
+EXPORT_SYMBOL_GPL(gpio_group_get_raw);
+
/**
* __gpio_set_value() - assign a gpio's value
* @gpio: gpio whose value will be assigned
@@ -1309,6 +2169,13 @@ void __gpio_set_value(unsigned gpio, int value)
}
EXPORT_SYMBOL_GPL(__gpio_set_value);
+void gpio_group_set_raw(const struct gpio_group *group, u32 value)
+{
+ struct gpio_chip *chip;
+ chip = gpio_to_chip(group->gpios[0]);
+ chip->set_multi(chip, group->mask, value | group->mask);
+}
+EXPORT_SYMBOL_GPL(gpio_group_set_raw);
/**
* __gpio_cansleep() - report whether gpio value access will sleep
* @gpio: gpio in question
@@ -1328,6 +2195,11 @@ int __gpio_cansleep(unsigned gpio)
}
EXPORT_SYMBOL_GPL(__gpio_cansleep);
+int gpio_group_cansleep(const struct gpio_group *group)
+{
+ return __gpio_cansleep(group->gpios[0]);
+}
+
/**
* __gpio_to_irq() - return the IRQ corresponding to a GPIO
* @gpio: gpio whose IRQ will be returned (already requested)
@@ -1362,6 +2234,15 @@ int gpio_get_value_cansleep(unsigned gpio)
}
EXPORT_SYMBOL_GPL(gpio_get_value_cansleep);
+u32 gpio_group_get_raw_cansleep(const struct gpio_group *group)
+{
+ struct gpio_chip *chip;
+ might_sleep_if(extra_checks);
+ chip = gpio_to_chip(group->gpios[0]);
+ return chip->get_multi ? chip->get_multi(chip, group->mask) : 0;
+}
+EXPORT_SYMBOL_GPL(gpio_group_get_raw_cansleep);
+
void gpio_set_value_cansleep(unsigned gpio, int value)
{
struct gpio_chip *chip;
@@ -1372,6 +2253,14 @@ void gpio_set_value_cansleep(unsigned gpio, int value)
}
EXPORT_SYMBOL_GPL(gpio_set_value_cansleep);
+void gpio_group_set_raw_cansleep(const struct gpio_group *group, u32 value)
+{
+ struct gpio_chip *chip;
+ might_sleep_if(extra_checks);
+ chip = gpio_to_chip(group->gpios[0]);
+ chip->set_multi(chip, group->mask, value & group->mask);
+}
+EXPORT_SYMBOL_GPL(gpio_group_set_raw_cansleep);
#ifdef CONFIG_DEBUG_FS
@@ -1381,18 +2270,24 @@ static void gpiolib_dbg_show(struct seq_file
*s, struct gpio_chip *chip)
unsigned gpio = chip->base;
struct gpio_desc *gdesc = &gpio_desc[gpio];
int is_out;
+ int is_open;
+ int is_group;
for (i = 0; i < chip->ngpio; i++, gpio++, gdesc++) {
if (!test_bit(FLAG_REQUESTED, &gdesc->flags))
continue;
is_out = test_bit(FLAG_IS_OUT, &gdesc->flags);
- seq_printf(s, " gpio-%-3d (%-20.20s) %s %s",
- gpio, gdesc->label,
- is_out ? "out" : "in ",
- chip->get
+ is_open = test_bit(FLAG_OPEN_DRAIN, &gdesc->flags);
+ is_group = (gdesc->group != NULL);
+ seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s %s",
+ gpio, gdesc->label,
+ is_out ? "out" : "in ",
+ chip->get
? (chip->get(chip, i) ? "hi" : "lo")
- : "? ");
+ : "? ",
+ is_open ? "open" : "act ",
+ is_group ? "grp" : "pin");
if (!is_out) {
int irq = gpio_to_irq(gpio);
@@ -1408,32 +2303,32 @@ static void gpiolib_dbg_show(struct seq_file
*s, struct gpio_chip *chip)
char *trigger;
switch (desc->status & IRQ_TYPE_SENSE_MASK) {
- case IRQ_TYPE_NONE:
- trigger = "(default)";
- break;
- case IRQ_TYPE_EDGE_FALLING:
- trigger = "edge-falling";
- break;
- case IRQ_TYPE_EDGE_RISING:
- trigger = "edge-rising";
- break;
- case IRQ_TYPE_EDGE_BOTH:
- trigger = "edge-both";
- break;
- case IRQ_TYPE_LEVEL_HIGH:
- trigger = "level-high";
- break;
- case IRQ_TYPE_LEVEL_LOW:
- trigger = "level-low";
- break;
- default:
- trigger = "?trigger?";
- break;
+ case IRQ_TYPE_NONE:
+ trigger = "(default)";
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ trigger = "edge-falling";
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ trigger = "edge-rising";
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ trigger = "edge-both";
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ trigger = "level-high";
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ trigger = "level-low";
+ break;
+ default:
+ trigger = "?trigger?";
+ break;
}
seq_printf(s, " irq-%d %s%s",
- irq, trigger,
- (desc->status & IRQ_WAKEUP)
+ irq, trigger,
+ (desc->status & IRQ_WAKEUP)
? " wakeup" : "");
}
}
diff --git a/drivers/gpio/pcf857x.c b/drivers/gpio/pcf857x.c
index 29f19ce..a51d9ad 100644
--- a/drivers/gpio/pcf857x.c
+++ b/drivers/gpio/pcf857x.c
@@ -79,6 +79,20 @@ static int pcf857x_input8(struct gpio_chip *chip,
unsigned offset)
return status;
}
+static int pcf857x_input8_multi(struct gpio_chip *chip, u32 mask)
+{
+ struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
+ int status;
+
+ mutex_lock(&gpio->lock);
+ gpio->out |= (u16)mask;
+ status = i2c_smbus_write_byte(gpio->client, gpio->out);
+ mutex_unlock(&gpio->lock);
+
+ return status;
+}
+
+
static int pcf857x_get8(struct gpio_chip *chip, unsigned offset)
{
struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
@@ -88,6 +102,15 @@ static int pcf857x_get8(struct gpio_chip *chip,
unsigned offset)
return (value < 0) ? 0 : (value & (1 << offset));
}
+static u32 pcf857x_get8_multi(struct gpio_chip *chip, u32 mask)
+{
+ struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
+ u32 value;
+
+ value = i2c_smbus_read_byte(gpio->client);
+ return (value < 0) ? 0 : (value & mask);
+}
+
static int pcf857x_output8(struct gpio_chip *chip, unsigned offset, int value)
{
struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
@@ -105,6 +128,25 @@ static int pcf857x_output8(struct gpio_chip
*chip, unsigned offset, int value)
return status;
}
+static int pcf857x_output8_multi(struct gpio_chip *chip, u32 mask, u32 value)
+{
+ struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
+ int status;
+
+ mutex_lock(&gpio->lock);
+ gpio->out &= ~mask;
+ gpio->out |= value;
+ status = i2c_smbus_write_byte(gpio->client, gpio->out);
+ mutex_unlock(&gpio->lock);
+
+ return status;
+}
+
+static void pcf857x_set8_multi(struct gpio_chip *chip, u32 mask, u32 value)
+{
+ pcf857x_output8_multi(chip, mask, value);
+}
+
static void pcf857x_set8(struct gpio_chip *chip, unsigned offset, int value)
{
pcf857x_output8(chip, offset, value);
@@ -147,6 +189,19 @@ static int pcf857x_input16(struct gpio_chip
*chip, unsigned offset)
return status;
}
+static int pcf857x_input16_multi(struct gpio_chip *chip, u32 mask)
+{
+ struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
+ int status;
+
+ mutex_lock(&gpio->lock);
+ gpio->out |= mask;
+ status = i2c_write_le16(gpio->client, gpio->out);
+ mutex_unlock(&gpio->lock);
+
+ return status;
+}
+
static int pcf857x_get16(struct gpio_chip *chip, unsigned offset)
{
struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
@@ -156,6 +211,15 @@ static int pcf857x_get16(struct gpio_chip *chip,
unsigned offset)
return (value < 0) ? 0 : (value & (1 << offset));
}
+static u32 pcf857x_get16_multi(struct gpio_chip *chip, u32 mask)
+{
+ struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
+ u32 value;
+
+ value = i2c_read_le16(gpio->client);
+ return (value < 0) ? 0 : (value & mask);
+}
+
static int pcf857x_output16(struct gpio_chip *chip, unsigned offset, int value)
{
struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
@@ -173,11 +237,30 @@ static int pcf857x_output16(struct gpio_chip
*chip, unsigned offset, int value)
return status;
}
+static int pcf857x_output16_multi(struct gpio_chip *chip, u32 mask, u32 value)
+{
+ struct pcf857x *gpio = container_of(chip, struct pcf857x, chip);
+ int status;
+
+ mutex_lock(&gpio->lock);
+ gpio->out &= ~mask;
+ gpio->out |= value;
+ status = i2c_write_le16(gpio->client, gpio->out);
+ mutex_unlock(&gpio->lock);
+
+ return status;
+}
+
static void pcf857x_set16(struct gpio_chip *chip, unsigned offset, int value)
{
pcf857x_output16(chip, offset, value);
}
+static void pcf857x_set16_multi(struct gpio_chip *chip, u32 mask, u32 value)
+{
+ pcf857x_output16_multi(chip, mask, value);
+}
+
/*-------------------------------------------------------------------------*/
static int pcf857x_probe(struct i2c_client *client,
@@ -190,7 +273,6 @@ static int pcf857x_probe(struct i2c_client *client,
pdata = client->dev.platform_data;
if (!pdata) {
dev_dbg(&client->dev, "no platform data\n");
- return -EINVAL;
}
/* Allocate, initialize, and register this gpio_chip. */
@@ -200,7 +282,7 @@ static int pcf857x_probe(struct i2c_client *client,
mutex_init(&gpio->lock);
- gpio->chip.base = pdata->gpio_base;
+ gpio->chip.base = pdata ? pdata->gpio_base : -1;
gpio->chip.can_sleep = 1;
gpio->chip.dev = &client->dev;
gpio->chip.owner = THIS_MODULE;
@@ -218,10 +300,14 @@ static int pcf857x_probe(struct i2c_client *client,
*/
gpio->chip.ngpio = id->driver_data;
if (gpio->chip.ngpio == 8) {
+ gpio->chip.direction_input_multi = pcf857x_input8_multi;
gpio->chip.direction_input = pcf857x_input8;
gpio->chip.get = pcf857x_get8;
+ gpio->chip.get_multi = pcf857x_get8_multi;
gpio->chip.direction_output = pcf857x_output8;
+ gpio->chip.direction_output_multi = pcf857x_output8_multi;
gpio->chip.set = pcf857x_set8;
+ gpio->chip.set_multi = pcf857x_set8_multi;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE))
@@ -239,9 +325,13 @@ static int pcf857x_probe(struct i2c_client *client,
*/
} else if (gpio->chip.ngpio == 16) {
gpio->chip.direction_input = pcf857x_input16;
+ gpio->chip.direction_input_multi = pcf857x_input16_multi;
gpio->chip.get = pcf857x_get16;
+ gpio->chip.get_multi = pcf857x_get16_multi;
gpio->chip.direction_output = pcf857x_output16;
+ gpio->chip.direction_output_multi = pcf857x_output16_multi;
gpio->chip.set = pcf857x_set16;
+ gpio->chip.set_multi = pcf857x_set16_multi;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
status = -EIO;
@@ -278,7 +368,7 @@ static int pcf857x_probe(struct i2c_client *client,
* to zero, our software copy of the "latch" then matches the chip's
* all-ones reset state. Otherwise it flags pins to be driven low.
*/
- gpio->out = ~pdata->n_latch;
+ gpio->out = pdata ? ~pdata->n_latch : ~0;
status = gpiochip_add(&gpio->chip);
if (status < 0)
@@ -299,7 +389,7 @@ static int pcf857x_probe(struct i2c_client *client,
/* Let platform code set up the GPIOs and their users.
* Now is the first time anyone could use them.
*/
- if (pdata->setup) {
+ if (pdata && pdata->setup) {
status = pdata->setup(client,
gpio->chip.base, gpio->chip.ngpio,
pdata->context);
@@ -310,7 +400,7 @@ static int pcf857x_probe(struct i2c_client *client,
return 0;
fail:
- dev_dbg(&client->dev, "probe error %d for '%s'\n",
+ dev_err(&client->dev, "probe error %d for '%s'\n",
status, client->name);
kfree(gpio);
return status;
@@ -322,7 +412,7 @@ static int pcf857x_remove(struct i2c_client *client)
struct pcf857x *gpio = i2c_get_clientdata(client);
int status = 0;
- if (pdata->teardown) {
+ if (pdata && pdata->teardown) {
status = pdata->teardown(client,
gpio->chip.base, gpio->chip.ngpio,
pdata->context);
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 66d6106..ed2407f 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -30,6 +30,7 @@ static inline int gpio_is_valid(int number)
struct seq_file;
struct module;
+struct device_node;
/**
* struct gpio_chip - abstract a GPIO controller
@@ -89,6 +90,22 @@ struct gpio_chip {
unsigned offset, int value);
void (*set)(struct gpio_chip *chip,
unsigned offset, int value);
+ int (*set_opendrain)(struct gpio_chip *chip,
+ unsigned offset, int value);
+ int (*set_opendrain_multi)(struct gpio_chip *chip,
+ u32 mask, u32 value);
+
+ int (*request_multi)(struct gpio_chip *chip,
+ u32 mask);
+ void (*free_multi)(struct gpio_chip *chip,
+ u32 mask);
+
+ int (*direction_input_multi)(struct gpio_chip *chip,
+ u32 mask);
+ int (*direction_output_multi)(struct gpio_chip *chip,
+ u32 mask, u32 value);
+ void (*set_multi)(struct gpio_chip *chip, u32 mask, u32 value);
+ u32 (*get_multi)(struct gpio_chip *chip, u32 mask);
int (*to_irq)(struct gpio_chip *chip,
unsigned offset);
@@ -100,6 +117,23 @@ struct gpio_chip {
char **names;
unsigned can_sleep:1;
unsigned exported:1;
+
+#if defined(CONFIG_OF_GPIO)
+ /*
+ * If CONFIG_OF is enabled, then all GPIO controllers described in the
+ * device tree automatically may have an OF translation
+ */
+ struct device_node *of_node;
+ int of_gpio_n_cells;
+ int (*of_xlate)(struct gpio_chip *gc, struct device_node *np,
+ const void *gpio_spec, u32 *flags);
+#endif
+};
+
+struct gpio_group
+{
+ unsigned gpios[32];
+ u32 mask;
};
extern const char *gpiochip_is_requested(struct gpio_chip *chip,
@@ -109,6 +143,9 @@ extern int __must_check gpiochip_reserve(int
start, int ngpio);
/* add/remove chips */
extern int gpiochip_add(struct gpio_chip *chip);
extern int __must_check gpiochip_remove(struct gpio_chip *chip);
+extern struct gpio_chip *gpiochip_find(void *data,
+ int (*match)(struct gpio_chip *chip,
+ void *data));
/* Always use the library code for GPIO management calls,
@@ -120,9 +157,28 @@ extern void gpio_free(unsigned gpio);
extern int gpio_direction_input(unsigned gpio);
extern int gpio_direction_output(unsigned gpio, int value);
+extern int gpio_set_opendrain(unsigned gpio, int value);
+
extern int gpio_get_value_cansleep(unsigned gpio);
extern void gpio_set_value_cansleep(unsigned gpio, int value);
+/*
+ * Handling of gpio groups
+ */
+extern struct gpio_group* gpio_group_request(unsigned *gpio, int ngpios,
+ const char *label);
+extern void gpio_group_free(struct gpio_group* group);
+
+extern int gpio_group_direction_input(const struct gpio_group *group);
+extern int gpio_group_direction_output(const struct gpio_group
*group, u32 value);
+
+extern u32 gpio_group_get_raw_cansleep(const struct gpio_group *group);
+extern void gpio_group_set_raw_cansleep(const struct gpio_group
*group, u32 value);
+
+extern int gpio_group_set_opendrain(struct gpio_group* group, u32 value);
+
+u32 gpio_group_raw_to_value(const struct gpio_group *group, u32 raw);
+u32 gpio_group_value_to_raw(const struct gpio_group *group, u32 value);
/* A platform's <asm/gpio.h> code may want to inline the I/O calls when
* the GPIO is constant and refers to some always-present controller,
@@ -135,6 +191,11 @@ extern int __gpio_cansleep(unsigned gpio);
extern int __gpio_to_irq(unsigned gpio);
+extern u32 gpio_group_get_raw(const struct gpio_group *group);
+extern void gpio_group_set_raw(const struct gpio_group *group, u32 value);
+
+extern int gpio_group_cansleep(const struct gpio_group *group);
+
#ifdef CONFIG_GPIO_SYSFS
/*
@@ -146,6 +207,12 @@ extern int gpio_export_link(struct device *dev,
const char *name,
unsigned gpio);
extern void gpio_unexport(unsigned gpio);
+extern int gpio_group_export(struct gpio_group *group,
+ bool direction_may_change);
+extern int gpio_group_export_link(struct device *dev, const char *name,
+ struct gpio_group *group);
+extern void gpio_group_unexport(struct gpio_group *group);
+
#endif /* CONFIG_GPIO_SYSFS */
#else /* !CONFIG_HAVE_GPIO_LIB */
diff --git a/include/linux/gpio-export.h b/include/linux/gpio-export.h
new file mode 100644
index 0000000..712e9ff
--- /dev/null
+++ b/include/linux/gpio-export.h
@@ -0,0 +1,64 @@
+/* Structures for passing gpio settings to drivers/gpio/gpio-export.c
+ * 201103 steene99
+ */
+#ifndef __LINUX_GPIO_EXPORT_H
+#define __LINUX_GPIO_EXPORT_H
+
+enum gpio_direction
+{
+ GPIO_INPUT,
+ GPIO_OUTPUT,
+ GPIO_CHANGE,
+ GPIO_OUTPUT_KEEP,
+};
+
+struct mp_gpio_line
+{
+ int gpio_num;
+ int active_low;
+ int open_drain;
+};
+
+#define GPIO_PIN(_nr, _active_low, _open_drain) \
+{ \
+ .gpio_num = _nr, \
+ .active_low = _active_low, \
+ .open_drain = _open_drain, \
+}
+
+#define SIMPLE_GPIO_PIN(_name, _nr) \
+static struct mp_gpio_line _name[] = \
+{ \
+ GPIO_PIN(_nr, 0, 0), \
+}
+
+#define MAX_GPIO_LABEL_SIZE 32
+
+struct mp_gpio_platform_data
+{
+ int gpio_count;
+ enum gpio_direction direction;
+ u32 initialvalue; // value
+ struct mp_gpio_line *gpio_data;
+ char desc[MAX_GPIO_LABEL_SIZE];
+};
+
+#define DEFINE_GPIO_GROUP(_name, _count, _direction, _initial, _pin, _desc) \
+ static struct mp_gpio_platform_data _name = { \
+ .gpio_count = _count, \
+ .direction = _direction, \
+ .initialvalue = _initial, \
+ .gpio_data = _pin, \
+ .desc=_desc, \
+ }
+
+#define GPIO_PDEV(_id, _pdata) \
+{ \
+ .name = "gpio-export", \
+ .id = _id, \
+ .dev = { \
+ .platform_data = &_pdata, \
+ }, \
+}
+
+#endif //__LINUX_GPIO_EXPORT_H
diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index 059bd18..f82edad 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -13,6 +13,7 @@
#include <linux/errno.h>
struct device;
+struct gpio_chip;
/*
* Some platforms don't support the GPIO programming interface.
@@ -33,6 +34,11 @@ static inline int gpio_request(unsigned gpio, const
char *label)
return -ENOSYS;
}
+static inline int gpio_group_request(unsigned *gpios, int ngpios,
const char *label)
+{
+ return ERR_PTR(-ENOSYS);
+}
+
static inline void gpio_free(unsigned gpio)
{
might_sleep();
@@ -41,16 +47,32 @@ static inline void gpio_free(unsigned gpio)
WARN_ON(1);
}
+static inline void gpio_group_free(struct gpio_group *group)
+{
+ might_sleep();
+ WARN_ON(1);
+}
+
static inline int gpio_direction_input(unsigned gpio)
{
return -ENOSYS;
}
+static inline int gpio_group_direction_input(const struct gpio_group *group)
+{
+ return -ENOSYS;
+}
+
static inline int gpio_direction_output(unsigned gpio, int value)
{
return -ENOSYS;
}
+static inline int gpio_group_direction_output(const struct gpio_group
*group, u32 value)
+{
+ return -ENOSYS;
+}
+
static inline int gpio_get_value(unsigned gpio)
{
/* GPIO can never have been requested or set as {in,out}put */
@@ -58,12 +80,29 @@ static inline int gpio_get_value(unsigned gpio)
return 0;
}
+static inline int gpio_group_get_raw(const struct gpio_group *group)
+{
+ WARN_ON(1);
+ return 0;
+}
+
static inline void gpio_set_value(unsigned gpio, int value)
{
/* GPIO can never have been requested or set as output */
WARN_ON(1);
}
+static inline void gpio_group_set_raw(const struct gpio_group *group,
u32 value)
+{
+ WARN_ON(1);
+}
+
+static inline int gpio_set_opendrain(unsigned gpio, int value)
+{
+ WARN_ON(1);
+ return -ENOSYS;
+}
+
static inline int gpio_cansleep(unsigned gpio)
{
/* GPIO can never have been requested or set as {in,out}put */
@@ -71,6 +110,12 @@ static inline int gpio_cansleep(unsigned gpio)
return 0;
}
+static inline int gpio_group_cansleep(const struct gpio_group *group)
+{
+ WARN_ON(1);
+ return 0;
+}
+
static inline int gpio_get_value_cansleep(unsigned gpio)
{
/* GPIO can never have been requested or set as {in,out}put */
@@ -78,12 +123,23 @@ static inline int gpio_get_value_cansleep(unsigned gpio)
return 0;
}
+static inline int gpio_group_get_raw_cansleep(const struct gpio_group *group)
+{
+ WARN_ON(1);
+ return 0;
+}
+
static inline void gpio_set_value_cansleep(unsigned gpio, int value)
{
/* GPIO can never have been requested or set as output */
WARN_ON(1);
}
+static inline void gpio_group_set_raw_cansleep(const struct
gpio_group *group, u32 value)
+{
+ WARN_ON(1);
+}
+
static inline int gpio_export(unsigned gpio, bool direction_may_change)
{
/* GPIO can never have been requested or set as {in,out}put */
@@ -91,6 +147,12 @@ static inline int gpio_export(unsigned gpio, bool
direction_may_change)
return -EINVAL;
}
+static inline int gpio_group_export(struct gpio_group *group, bool
direction_may_change)
+{
+ WARN_ON(1);
+ return -EINVAL;
+}
+
static inline int gpio_export_link(struct device *dev, const char *name,
unsigned gpio)
{
@@ -99,6 +161,12 @@ static inline int gpio_export_link(struct device
*dev, const char *name,
return -EINVAL;
}
+static inline int gpio_group_export_link(struct device *dev, const char *name,
+ struct gpio_group *group)
+{
+ WARN_ON(1);
+ return -EINVAL;
+}
static inline void gpio_unexport(unsigned gpio)
{
@@ -106,6 +174,11 @@ static inline void gpio_unexport(unsigned gpio)
WARN_ON(1);
}
+static inline void gpio_group_unexport(struct gpio_group *group)
+{
+ WARN_ON(1);
+}
+
static inline int gpio_to_irq(unsigned gpio)
{
/* GPIO can never have been requested or set as input */
@@ -122,4 +195,14 @@ static inline int irq_to_gpio(unsigned irq)
#endif
+static inline int gpio_direction_output_keep(int gpio)
+{
+ return gpio_direction_output(gpio, gpio_get_value_cansleep(gpio));
+}
+
+static inline int gpio_group_direction_output_keep(const struct
gpio_group *group)
+{
+ return gpio_group_direction_output(group, gpio_group_get_raw_cansleep(group));
+}
+
#endif /* __LINUX_GPIO_H */
--
1.7.5.4
--
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