[PATCH 0/2] regulator: add userspace-consumer driver

[PATCH 0/2] regulator: add userspace-consumer driver

[Mike Rapoport]

The userspace-consumer driver allows control of voltage and current
regulator state from userspace. This is required for fine-grained power
management of devices that are completely controller by userspace
applications, e.g. a GPS transciever connected to a serial port.

The first patch in the serie reorginases the way structs are defined in
the regulator framework headers so that regulator_consumer_supply can be
used without need to include include/linux/regulator/machine.h

The second patch is actully userspace-consumer driver implementation.

Mike Rapoport (2):
  regulator: move regulator_consumer_supply from machine.h to
    consumer.h
  regulator: add userspace-consumer driver

 drivers/regulator/Kconfig                    |   10 ++
 drivers/regulator/Makefile                   |    1 +
 drivers/regulator/userspace-consumer.c       |  213 ++++++++++++++++++++++++++
 include/linux/regulator/consumer.h           |   13 ++
 include/linux/regulator/machine.h            |   14 +--
 include/linux/regulator/userspace-consumer.h |   25 +++
 6 files changed, 263 insertions(+), 13 deletions(-)
 create mode 100644 drivers/regulator/userspace-consumer.c
 create mode 100644 include/linux/regulator/userspace-consumer.h

[PATCH 1/2] regulator: move regulator_consumer_supply from machine.h to consumer.h

[Mike Rapoport]

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
---
 include/linux/regulator/consumer.h |   13 +++++++++++++
 include/linux/regulator/machine.h  |   14 +-------------
 2 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index 277f4b9..3c7acb7 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -120,6 +120,19 @@ struct regulator_bulk_data {
 	struct regulator *consumer;
 };
 
+/**
+ * struct regulator_consumer_supply - supply -> device mapping
+ *
+ * This maps a supply name to a device.
+ *
+ * @dev: Device structure for the consumer.
+ * @supply: Name for the supply.
+ */
+struct regulator_consumer_supply {
+	struct device *dev;	/* consumer */
+	const char *supply;	/* consumer supply - e.g. "vcc" */
+};
+
 #if defined(CONFIG_REGULATOR)
 
 /* regulator get and put */
diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h
index bac64fa..c64c833 100644
--- a/include/linux/regulator/machine.h
+++ b/include/linux/regulator/machine.h
@@ -19,6 +19,7 @@
 #include <linux/suspend.h>
 
 struct regulator;
+struct regulator_consumer_supply;
 
 /*
  * Regulator operation constraint flags. These flags are used to enable
@@ -124,19 +125,6 @@ struct regulation_constraints {
 };
 
 /**
- * struct regulator_consumer_supply - supply -> device mapping
- *
- * This maps a supply name to a device.
- *
- * @dev: Device structure for the consumer.
- * @supply: Name for the supply.
- */
-struct regulator_consumer_supply {
-	struct device *dev;	/* consumer */
-	const char *supply;	/* consumer supply - e.g. "vcc" */
-};
-
-/**
  * struct regulator_init_data - regulator platform initialisation data.
  *
  * Initialisation constraints, our supply and consumers supplies.
-- 
1.5.6.4

[PATCH 2/2] regulator: add userspace-consumer driver

[Mike Rapoport]

The userspace-consumer driver allows control of voltage and current
regulator state from userspace. This is required for fine-grained power
management of devices that are completely controller by userspace
applications, e.g. a GPS transciever connected to a serial port.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
---
 drivers/regulator/Kconfig                    |   10 ++
 drivers/regulator/Makefile                   |    1 +
 drivers/regulator/userspace-consumer.c       |  213 ++++++++++++++++++++++++++
 include/linux/regulator/userspace-consumer.h |   25 +++
 4 files changed, 249 insertions(+), 0 deletions(-)
 create mode 100644 drivers/regulator/userspace-consumer.c
 create mode 100644 include/linux/regulator/userspace-consumer.h

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index e58c0ce..d736e61 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -47,6 +47,16 @@ config REGULATOR_VIRTUAL_CONSUMER
 
           If unsure, say no.
 
+config REGULATOR_USERSPACE_CONSUMER
+	tristate "Userspace regulator consumer support"
+	default n
+	help
+	  There are some classes of devices that are controlled entirely
+	  from user space. Usersapce consumer driver provides ability to
+	  control power supplies for such devices.
+
+          If unsure, say no.
+
 config REGULATOR_BQ24022
 	tristate "TI bq24022 Dual Input 1-Cell Li-Ion Charger IC"
 	default n
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index bac133a..b8d4290 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -6,6 +6,7 @@
 obj-$(CONFIG_REGULATOR) += core.o
 obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o
 obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o
+obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
 
 obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
 obj-$(CONFIG_REGULATOR_TWL4030) += twl4030-regulator.o
diff --git a/drivers/regulator/userspace-consumer.c b/drivers/regulator/userspace-consumer.c
new file mode 100644
index 0000000..69115e6
--- /dev/null
+++ b/drivers/regulator/userspace-consumer.c
@@ -0,0 +1,213 @@
+/*
+ * line-consumer.c
+ *
+ * Copyright 2009 CompuLab, Ltd..
+ *
+ * Author: Mike Rapoport <mike@compulab.co.il>
+ *
+ * Based of virtual consumer driver:
+ *   Copyright 2008 Wolfson Microelectronics PLC.
+ *   Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regulator/userspace-consumer.h>
+
+struct userspace_consumer_data {
+	const char *name;
+
+	struct mutex lock;
+	bool enabled;
+
+	int num_supplies;
+	struct regulator_bulk_data *supplies;
+};
+
+static ssize_t show_name(struct device *dev,
+			  struct device_attribute *attr, char *buf)
+{
+	struct userspace_consumer_data *data = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", data->name);
+}
+
+static ssize_t show_state(struct device *dev,
+			  struct device_attribute *attr, char *buf)
+{
+	struct userspace_consumer_data *data = dev_get_drvdata(dev);
+
+	if (data->enabled)
+		return sprintf(buf, "enabled\n");
+
+	return sprintf(buf, "disabled\n");
+}
+
+static ssize_t set_state(struct device *dev, struct device_attribute *attr,
+			 const char *buf, size_t count)
+{
+	struct userspace_consumer_data *data = dev_get_drvdata(dev);
+	bool enabled;
+	int ret;
+
+	/*
+	 * sysfs_streq() doesn't need the \n's, but we add them so the strings
+	 * will be shared with show_state(), above.
+	 */
+	if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1"))
+		enabled = true;
+	else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0"))
+		enabled = false;
+	else {
+		dev_err(dev, "Configuring invalid mode\n");
+		return count;
+	}
+
+	mutex_lock(&data->lock);
+	if (enabled != data->enabled) {
+		if (enabled)
+			ret = regulator_bulk_enable(data->num_supplies,
+						    data->supplies);
+		else
+			ret = regulator_bulk_disable(data->num_supplies,
+						     data->supplies);
+
+		if (ret == 0)
+			data->enabled = enabled;
+		else
+			dev_err(dev, "Failed to configure state: %d\n", ret);
+	}
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static DEVICE_ATTR(name, 0444, show_name, NULL);
+static DEVICE_ATTR(state, 0644, show_state, set_state);
+
+static struct device_attribute *attributes[] = {
+	&dev_attr_name,
+	&dev_attr_state,
+};
+
+static int regulator_userspace_consumer_probe(struct platform_device *pdev)
+{
+	struct regulator_userspace_consumer_data *pdata;
+	struct userspace_consumer_data *drvdata;
+	int ret, i;
+
+	pdata = pdev->dev.platform_data;
+	if (!pdata)
+		return -EINVAL;
+
+	drvdata = kzalloc(sizeof(struct userspace_consumer_data), GFP_KERNEL);
+	if (drvdata == NULL)
+		return -ENOMEM;
+
+	drvdata->name = pdata->name;
+	drvdata->num_supplies = pdata->num_supplies;
+
+	drvdata->supplies = kzalloc(sizeof(struct regulator_bulk_data) *
+				    drvdata->num_supplies,
+				    GFP_KERNEL);
+	if (drvdata->supplies == NULL) {
+		ret = -ENOMEM;
+		goto err_alloc_supplies;
+	}
+
+	mutex_init(&drvdata->lock);
+
+	for (i = 0; i < drvdata->num_supplies; i++)
+		drvdata->supplies[i].supply = pdata->supplies[i].supply;
+
+	ret = regulator_bulk_get(&pdev->dev, drvdata->num_supplies,
+				 drvdata->supplies);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret);
+		goto err_alloc_supplies;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(attributes); i++) {
+		ret = device_create_file(&pdev->dev, attributes[i]);
+		if (ret != 0)
+			goto err_create_attrs;
+	}
+
+	if (pdata->init_on)
+		ret = regulator_bulk_enable(drvdata->num_supplies,
+					    drvdata->supplies);
+
+	drvdata->enabled = pdata->init_on;
+
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to set initial state: %d\n", ret);
+		goto err_create_attrs;
+	}
+
+	platform_set_drvdata(pdev, drvdata);
+
+	return 0;
+
+err_create_attrs:
+	for (i = 0; i < ARRAY_SIZE(attributes); i++)
+		device_remove_file(&pdev->dev, attributes[i]);
+
+	regulator_bulk_free(drvdata->num_supplies, drvdata->supplies);
+
+	kfree(drvdata->supplies);
+
+err_alloc_supplies:
+	kfree(drvdata);
+	return ret;
+}
+
+static int regulator_userspace_consumer_remove(struct platform_device *pdev)
+{
+	struct userspace_consumer_data *data = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(attributes); i++)
+		device_remove_file(&pdev->dev, attributes[i]);
+
+	if (data->enabled)
+		regulator_bulk_disable(data->num_supplies, data->supplies);
+
+	regulator_bulk_free(data->num_supplies, data->supplies);
+	kfree(data->supplies);
+	kfree(data);
+
+	return 0;
+}
+
+static struct platform_driver regulator_userspace_consumer_driver = {
+	.probe		= regulator_userspace_consumer_probe,
+	.remove		= regulator_userspace_consumer_remove,
+	.driver		= {
+		.name		= "reg-userspace-consumer",
+	},
+};
+
+
+static int __init regulator_userspace_consumer_init(void)
+{
+	return platform_driver_register(&regulator_userspace_consumer_driver);
+}
+module_init(regulator_userspace_consumer_init);
+
+static void __exit regulator_userspace_consumer_exit(void)
+{
+	platform_driver_unregister(&regulator_userspace_consumer_driver);
+}
+module_exit(regulator_userspace_consumer_exit);
+
+MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
+MODULE_DESCRIPTION("Line consumer for voltage and current regulators");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/regulator/userspace-consumer.h b/include/linux/regulator/userspace-consumer.h
new file mode 100644
index 0000000..b1c2c4e
--- /dev/null
+++ b/include/linux/regulator/userspace-consumer.h
@@ -0,0 +1,25 @@
+#ifndef __REGULATOR_PLATFORM_CONSUMER_H_
+#define __REGULATOR_PLATFORM_CONSUMER_H_
+
+struct regulator_consumer_supply;
+
+/**
+ * struct regulator_userspace_consumer_data - line consumer
+ * initialisation data.
+ *
+ * @name: Name for the consumer line
+ * @num_supplies: Number of supplies feeding the line
+ * @supplies: Supplies configuration.
+ * @init_on: Set if the regulators supplying the line should be
+ *           enabled during initialisation
+ */
+struct regulator_userspace_consumer_data {
+	const char *name;
+
+	int num_supplies;
+	struct regulator_consumer_supply *supplies;
+
+	bool init_on;
+};
+
+#endif /* __REGULATOR_PLATFORM_CONSUMER_H_ */
-- 
1.5.6.4

Re: [PATCH 2/2] regulator: add userspace-consumer driver

[Mark Brown]

On Sun, Apr 26, 2009 at 12:17:23PM +0300, Mike Rapoport wrote:

> +/*
> + * line-consumer.c

Bitrot.

> +	for (i = 0; i < drvdata->num_supplies; i++)
> +		drvdata->supplies[i].supply = pdata->supplies[i].supply;

...

> +struct regulator_userspace_consumer_data {
> +	const char *name;
> +
> +	int num_supplies;
> +	struct regulator_consumer_supply *supplies;

Why are you using a regulator_consumer_supply here?  All that's being
used here is the name and I can't see why you'd want the device.

Re: [PATCH 2/2] regulator: add userspace-consumer driver

[Mike Rapoport]

Mark Brown wrote:
> On Sun, Apr 26, 2009 at 12:17:23PM +0300, Mike Rapoport wrote:
> 
>> +/*
>> + * line-consumer.c
> 
> Bitrot.

Thanks, I'll fix it.

> 
>> +	for (i = 0; i < drvdata->num_supplies; i++)
>> +		drvdata->supplies[i].supply = pdata->supplies[i].supply;
> 
> ...
> 
>> +struct regulator_userspace_consumer_data {
>> +	const char *name;
>> +
>> +	int num_supplies;
>> +	struct regulator_consumer_supply *supplies;
> 
> Why are you using a regulator_consumer_supply here?  All that's being
> used here is the name and I can't see why you'd want the device.

For upwards compatibility :)
Well, seriously, I think using 'struct regulator_consumer_supply *supplies'
rather than 'char *supplies' makes the platform code that registers the
userspace-consumer device clearer.

> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

-- 
Sincerely yours,
Mike.

Re: [PATCH 2/2] regulator: add userspace-consumer driver

[Mark Brown]

On Sun, Apr 26, 2009 at 02:47:04PM +0300, Mike Rapoport wrote:
> Mark Brown wrote:

> > Why are you using a regulator_consumer_supply here?  All that's being
> > used here is the name and I can't see why you'd want the device.

> For upwards compatibility :)
> Well, seriously, I think using 'struct regulator_consumer_supply *supplies'
> rather than 'char *supplies' makes the platform code that registers the
> userspace-consumer device clearer.

On the other hand it merges the consumer and machine APIs, which we
really want to keep separate, and I can't see having the struct device
in there doing anything except confuse people.  If you're going to pick
an existing structure to use I'd be more inclined to use the bulk
consumer structure (which the driver needs to allocate anyway).

Re: [PATCH 2/2] regulator: add userspace-consumer driver

[Mike Rapoport]

Mark Brown wrote:
> On Sun, Apr 26, 2009 at 02:47:04PM +0300, Mike Rapoport wrote:
>> Mark Brown wrote:
> 
>>> Why are you using a regulator_consumer_supply here?  All that's being
>>> used here is the name and I can't see why you'd want the device.
> 
>> For upwards compatibility :)
>> Well, seriously, I think using 'struct regulator_consumer_supply *supplies'
>> rather than 'char *supplies' makes the platform code that registers the
>> userspace-consumer device clearer.
> 
> On the other hand it merges the consumer and machine APIs, which we
> really want to keep separate, and I can't see having the struct device
> in there doing anything except confuse people.  If you're going to pick
> an existing structure to use I'd be more inclined to use the bulk
> consumer structure (which the driver needs to allocate anyway).

Ok, I'll use bulk consumer and then apparently I can avoid it's allocation...


-- 
Sincerely yours,
Mike.

[PATCH] regulator: add userspace-consumer driver

[Mike Rapoport]

The userspace-consumer driver allows control of voltage and current
regulator state from userspace. This is required for fine-grained
power management of devices that are completely controller by userspace
applications, e.g. a GPS transciever connected to a serial port.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
---
 drivers/regulator/Kconfig                    |   10 ++
 drivers/regulator/Makefile                   |    1 +
 drivers/regulator/userspace-consumer.c       |  200 ++++++++++++++++++++++++++
 include/linux/regulator/userspace-consumer.h |   25 ++++
 4 files changed, 236 insertions(+), 0 deletions(-)
 create mode 100644 drivers/regulator/userspace-consumer.c
 create mode 100644 include/linux/regulator/userspace-consumer.h

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index e58c0ce..d736e61 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -47,6 +47,16 @@ config REGULATOR_VIRTUAL_CONSUMER
 
           If unsure, say no.
 
+config REGULATOR_USERSPACE_CONSUMER
+	tristate "Userspace regulator consumer support"
+	default n
+	help
+	  There are some classes of devices that are controlled entirely
+	  from user space. Usersapce consumer driver provides ability to
+	  control power supplies for such devices.
+
+          If unsure, say no.
+
 config REGULATOR_BQ24022
 	tristate "TI bq24022 Dual Input 1-Cell Li-Ion Charger IC"
 	default n
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index bac133a..b8d4290 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -6,6 +6,7 @@
 obj-$(CONFIG_REGULATOR) += core.o
 obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o
 obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o
+obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
 
 obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
 obj-$(CONFIG_REGULATOR_TWL4030) += twl4030-regulator.o
diff --git a/drivers/regulator/userspace-consumer.c b/drivers/regulator/userspace-consumer.c
new file mode 100644
index 0000000..71fcf9d
--- /dev/null
+++ b/drivers/regulator/userspace-consumer.c
@@ -0,0 +1,200 @@
+/*
+ * userspace-consumer.c
+ *
+ * Copyright 2009 CompuLab, Ltd.
+ *
+ * Author: Mike Rapoport <mike@compulab.co.il>
+ *
+ * Based of virtual consumer driver:
+ *   Copyright 2008 Wolfson Microelectronics PLC.
+ *   Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regulator/userspace-consumer.h>
+
+struct userspace_consumer_data {
+	const char *name;
+
+	struct mutex lock;
+	bool enabled;
+
+	int num_supplies;
+	struct regulator_bulk_data *supplies;
+};
+
+static ssize_t show_name(struct device *dev,
+			  struct device_attribute *attr, char *buf)
+{
+	struct userspace_consumer_data *data = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", data->name);
+}
+
+static ssize_t show_state(struct device *dev,
+			  struct device_attribute *attr, char *buf)
+{
+	struct userspace_consumer_data *data = dev_get_drvdata(dev);
+
+	if (data->enabled)
+		return sprintf(buf, "enabled\n");
+
+	return sprintf(buf, "disabled\n");
+}
+
+static ssize_t set_state(struct device *dev, struct device_attribute *attr,
+			 const char *buf, size_t count)
+{
+	struct userspace_consumer_data *data = dev_get_drvdata(dev);
+	bool enabled;
+	int ret;
+
+	/*
+	 * sysfs_streq() doesn't need the \n's, but we add them so the strings
+	 * will be shared with show_state(), above.
+	 */
+	if (sysfs_streq(buf, "enabled\n") || sysfs_streq(buf, "1"))
+		enabled = true;
+	else if (sysfs_streq(buf, "disabled\n") || sysfs_streq(buf, "0"))
+		enabled = false;
+	else {
+		dev_err(dev, "Configuring invalid mode\n");
+		return count;
+	}
+
+	mutex_lock(&data->lock);
+	if (enabled != data->enabled) {
+		if (enabled)
+			ret = regulator_bulk_enable(data->num_supplies,
+						    data->supplies);
+		else
+			ret = regulator_bulk_disable(data->num_supplies,
+						     data->supplies);
+
+		if (ret == 0)
+			data->enabled = enabled;
+		else
+			dev_err(dev, "Failed to configure state: %d\n", ret);
+	}
+	mutex_unlock(&data->lock);
+
+	return count;
+}
+
+static DEVICE_ATTR(name, 0444, show_name, NULL);
+static DEVICE_ATTR(state, 0644, show_state, set_state);
+
+static struct device_attribute *attributes[] = {
+	&dev_attr_name,
+	&dev_attr_state,
+};
+
+static int regulator_userspace_consumer_probe(struct platform_device *pdev)
+{
+	struct regulator_userspace_consumer_data *pdata;
+	struct userspace_consumer_data *drvdata;
+	int ret, i;
+
+	pdata = pdev->dev.platform_data;
+	if (!pdata)
+		return -EINVAL;
+
+	drvdata = kzalloc(sizeof(struct userspace_consumer_data), GFP_KERNEL);
+	if (drvdata == NULL)
+		return -ENOMEM;
+
+	drvdata->name = pdata->name;
+	drvdata->num_supplies = pdata->num_supplies;
+	drvdata->supplies = pdata->supplies;
+
+	mutex_init(&drvdata->lock);
+
+	ret = regulator_bulk_get(&pdev->dev, drvdata->num_supplies,
+				 drvdata->supplies);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to get supplies: %d\n", ret);
+		goto err_alloc_supplies;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(attributes); i++) {
+		ret = device_create_file(&pdev->dev, attributes[i]);
+		if (ret != 0)
+			goto err_create_attrs;
+	}
+
+	if (pdata->init_on)
+		ret = regulator_bulk_enable(drvdata->num_supplies,
+					    drvdata->supplies);
+
+	drvdata->enabled = pdata->init_on;
+
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to set initial state: %d\n", ret);
+		goto err_create_attrs;
+	}
+
+	platform_set_drvdata(pdev, drvdata);
+
+	return 0;
+
+err_create_attrs:
+	for (i = 0; i < ARRAY_SIZE(attributes); i++)
+		device_remove_file(&pdev->dev, attributes[i]);
+
+	regulator_bulk_free(drvdata->num_supplies, drvdata->supplies);
+
+err_alloc_supplies:
+	kfree(drvdata);
+	return ret;
+}
+
+static int regulator_userspace_consumer_remove(struct platform_device *pdev)
+{
+	struct userspace_consumer_data *data = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(attributes); i++)
+		device_remove_file(&pdev->dev, attributes[i]);
+
+	if (data->enabled)
+		regulator_bulk_disable(data->num_supplies, data->supplies);
+
+	regulator_bulk_free(data->num_supplies, data->supplies);
+	kfree(data);
+
+	return 0;
+}
+
+static struct platform_driver regulator_userspace_consumer_driver = {
+	.probe		= regulator_userspace_consumer_probe,
+	.remove		= regulator_userspace_consumer_remove,
+	.driver		= {
+		.name		= "reg-userspace-consumer",
+	},
+};
+
+
+static int __init regulator_userspace_consumer_init(void)
+{
+	return platform_driver_register(&regulator_userspace_consumer_driver);
+}
+module_init(regulator_userspace_consumer_init);
+
+static void __exit regulator_userspace_consumer_exit(void)
+{
+	platform_driver_unregister(&regulator_userspace_consumer_driver);
+}
+module_exit(regulator_userspace_consumer_exit);
+
+MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
+MODULE_DESCRIPTION("Userspace consumer for voltage and current regulators");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/regulator/userspace-consumer.h b/include/linux/regulator/userspace-consumer.h
new file mode 100644
index 0000000..b4554ce
--- /dev/null
+++ b/include/linux/regulator/userspace-consumer.h
@@ -0,0 +1,25 @@
+#ifndef __REGULATOR_PLATFORM_CONSUMER_H_
+#define __REGULATOR_PLATFORM_CONSUMER_H_
+
+struct regulator_consumer_supply;
+
+/**
+ * struct regulator_userspace_consumer_data - line consumer
+ * initialisation data.
+ *
+ * @name: Name for the consumer line
+ * @num_supplies: Number of supplies feeding the line
+ * @supplies: Supplies configuration.
+ * @init_on: Set if the regulators supplying the line should be
+ *           enabled during initialisation
+ */
+struct regulator_userspace_consumer_data {
+	const char *name;
+
+	int num_supplies;
+	struct regulator_bulk_data *supplies;
+
+	bool init_on;
+};
+
+#endif /* __REGULATOR_PLATFORM_CONSUMER_H_ */
-- 
1.5.6.4

Re: [PATCH] regulator: add userspace-consumer driver

[Mark Brown]

On Sun, Apr 26, 2009 at 04:49:39PM +0300, Mike Rapoport wrote:
> The userspace-consumer driver allows control of voltage and current
> regulator state from userspace. This is required for fine-grained
> power management of devices that are completely controller by userspace
> applications, e.g. a GPS transciever connected to a serial port.

> Signed-off-by: Mike Rapoport <mike@compulab.co.il>

Looks good, though the probe() and remove() could have __devinit and
__devexit annotations.

Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

Re: [PATCH] regulator: add userspace-consumer driver

[Liam Girdwood]

On Mon, 2009-04-27 at 12:43 +0100, Mark Brown wrote:
> On Sun, Apr 26, 2009 at 04:49:39PM +0300, Mike Rapoport wrote:
> > The userspace-consumer driver allows control of voltage and current
> > regulator state from userspace. This is required for fine-grained
> > power management of devices that are completely controller by userspace
> > applications, e.g. a GPS transciever connected to a serial port.
> 
> > Signed-off-by: Mike Rapoport <mike@compulab.co.il>
> 
> Looks good, though the probe() and remove() could have __devinit and
> __devexit annotations.
> 
> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

Heh, just acked in time. Was about to hit enter on my keyboard ;)

Liam

Re: [PATCH] regulator: add userspace-consumer driver

[Liam Girdwood]

On Sun, 2009-04-26 at 16:49 +0300, Mike Rapoport wrote:
> The userspace-consumer driver allows control of voltage and current
> regulator state from userspace. This is required for fine-grained
> power management of devices that are completely controller by userspace
> applications, e.g. a GPS transciever connected to a serial port.
> 
> Signed-off-by: Mike Rapoport <mike@compulab.co.il>

Applied.

Thanks

Liam