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Date: Thu, 10 Jul 2008 21:04:46 +0200
From: Philipp Zabel <philipp.zabel@...il.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Liam Girdwood <lg@...nsource.wolfsonmicro.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH 2/2] regulator: virtual consumer current limit support
This expands the virtual consumer driver to handle current limit control
via the min_microamps and max_microamps sysfs files.
Signed-off-by: Philipp Zabel <philipp.zabel@...il.com>
---
drivers/regulator/virtual.c | 99 +++++++++++++++++++++++++++++++++++++++++-
1 files changed, 96 insertions(+), 3 deletions(-)
diff --git a/drivers/regulator/virtual.c b/drivers/regulator/virtual.c
index 7018f1c..5ddb464 100644
--- a/drivers/regulator/virtual.c
+++ b/drivers/regulator/virtual.c
@@ -22,10 +22,12 @@ struct virtual_consumer_data {
int enabled;
int min_uV;
int max_uV;
+ int min_uA;
+ int max_uA;
unsigned int mode;
};
-static void update_constraints(struct virtual_consumer_data *data)
+static void update_voltage_constraints(struct virtual_consumer_data *data)
{
int ret;
@@ -59,6 +61,41 @@ static void update_constraints(struct virtual_consumer_data *data)
}
}
+static void update_current_limit_constraints(struct virtual_consumer_data
+ *data)
+{
+ int ret;
+
+ if (data->max_uA
+ && data->min_uA <= data->max_uA) {
+ ret = regulator_set_current_limit(data->regulator,
+ data->min_uA, data->max_uA);
+ if (ret != 0) {
+ pr_err("regulator_set_current_limit() failed: %d\n",
+ ret);
+ return;
+ }
+ }
+
+ if (data->max_uA && !data->enabled) {
+ ret = regulator_enable(data->regulator);
+ if (ret == 0)
+ data->enabled = 1;
+ else
+ printk(KERN_ERR "regulator_enable() failed: %d\n",
+ ret);
+ }
+
+ if (!(data->min_uA && data->max_uA) && data->enabled) {
+ ret = regulator_disable(data->regulator);
+ if (ret == 0)
+ data->enabled = 0;
+ else
+ printk(KERN_ERR "regulator_disable() failed: %d\n",
+ ret);
+ }
+}
+
static ssize_t show_min_uV(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -78,7 +115,7 @@ static ssize_t set_min_uV(struct device *dev, struct device_attribute *attr,
mutex_lock(&data->lock);
data->min_uV = val;
- update_constraints(data);
+ update_voltage_constraints(data);
mutex_unlock(&data->lock);
@@ -104,7 +141,59 @@ static ssize_t set_max_uV(struct device *dev, struct device_attribute *attr,
mutex_lock(&data->lock);
data->max_uV = val;
- update_constraints(data);
+ update_voltage_constraints(data);
+
+ mutex_unlock(&data->lock);
+
+ return count;
+}
+
+static ssize_t show_min_uA(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct virtual_consumer_data *data = dev_get_drvdata(dev);
+ return sprintf(buf, "%d\n", data->min_uA);
+}
+
+static ssize_t set_min_uA(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct virtual_consumer_data *data = dev_get_drvdata(dev);
+ long val;
+
+ if (strict_strtol(buf, 10, &val) != 0)
+ return count;
+
+ mutex_lock(&data->lock);
+
+ data->min_uA = val;
+ update_current_limit_constraints(data);
+
+ mutex_unlock(&data->lock);
+
+ return count;
+}
+
+static ssize_t show_max_uA(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct virtual_consumer_data *data = dev_get_drvdata(dev);
+ return sprintf(buf, "%d\n", data->max_uA);
+}
+
+static ssize_t set_max_uA(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct virtual_consumer_data *data = dev_get_drvdata(dev);
+ long val;
+
+ if (strict_strtol(buf, 10, &val) != 0)
+ return count;
+
+ mutex_lock(&data->lock);
+
+ data->max_uA = val;
+ update_current_limit_constraints(data);
mutex_unlock(&data->lock);
@@ -163,11 +252,15 @@ static ssize_t set_mode(struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR(min_microvolts, 0666, show_min_uV, set_min_uV);
static DEVICE_ATTR(max_microvolts, 0666, show_max_uV, set_max_uV);
+static DEVICE_ATTR(min_microamps, 0666, show_min_uA, set_min_uA);
+static DEVICE_ATTR(max_microamps, 0666, show_max_uA, set_max_uA);
static DEVICE_ATTR(mode, 0666, show_mode, set_mode);
struct device_attribute *attributes[] = {
&dev_attr_min_microvolts,
&dev_attr_max_microvolts,
+ &dev_attr_min_microamps,
+ &dev_attr_max_microamps,
&dev_attr_mode,
};
--
1.5.6.2
--
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