linux-kernel - [PATCH 1/2] PM: devfreq: add freq table and available

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Date:	Wed, 13 Jun 2012 12:39:09 +0800
From:	Xiaoguang Chen <chenxg@...vell.com>
To:	linux-kernel@...r.kernel.org
Cc:	myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
	Xiaoguang Chen <chenxg@...vell.com>
Subject: [PATCH 1/2] PM: devfreq: add freq table and available_freqs

Devfreq framework don't have a frequency table, add it
for easy use.

Signed-off-by: Xiaoguang Chen <chenxg@...vell.com>
---
 drivers/devfreq/devfreq.c |   26 ++++++++++++++++++++++++++
 include/linux/devfreq.h   |   12 ++++++++++++
 2 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 70c31d4..2144200 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -460,6 +460,17 @@ int devfreq_remove_device(struct devfreq *devfreq)
 	return 0;
 }
 
+/*
+ * devfreq_set_freq_table()- Set frequency table for devfreq
+ * @devfreq	The devfreq instance
+ * @table	The frequency table that device supports
+ */
+void devfreq_set_freq_table(struct devfreq *devfreq,
+			    struct devfreq_frequency_table *table)
+{
+	devfreq->freq_table = table;
+}
+
 static ssize_t show_governor(struct device *dev,
 			     struct device_attribute *attr, char *buf)
 {
@@ -472,6 +483,20 @@ static ssize_t show_freq(struct device *dev,
 	return sprintf(buf, "%lu\n", to_devfreq(dev)->previous_freq);
 }
 
+static ssize_t show_avail_freq(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	int len = 0, i;
+	struct devfreq *devfreq = to_devfreq(dev);
+	if (devfreq->freq_table)
+		for (i = 0; devfreq->freq_table[i].frequency != DEVFREQ_TABLE_END; i++)
+			len += sprintf(buf + len, "%lu\n",
+				       devfreq->freq_table[i].frequency);
+	if (len == 0)
+		len += sprintf(buf + len, "No frequency table is provided\n");
+	return len;
+}
+
 static ssize_t show_polling_interval(struct device *dev,
 				     struct device_attribute *attr, char *buf)
 {
@@ -595,6 +620,7 @@ static struct device_attribute devfreq_attrs[] = {
 	       store_polling_interval),
 	__ATTR(min_freq, S_IRUGO | S_IWUSR, show_min_freq, store_min_freq),
 	__ATTR(max_freq, S_IRUGO | S_IWUSR, show_max_freq, store_max_freq),
+	__ATTR(available_freqs, S_IRUGO, show_avail_freq, NULL),
 	{ },
 };
 
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 281c72a..e5e4036 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -52,6 +52,14 @@ struct devfreq_dev_status {
  */
 #define DEVFREQ_FLAG_LEAST_UPPER_BOUND		0x1
 
+#define DEVFREQ_ENTRY_INVALID (~0)
+#define DEVFREQ_TABLE_END     (~1)
+
+struct devfreq_frequency_table {
+	unsigned int index;
+	unsigned long frequency;
+};
+
 /**
  * struct devfreq_dev_profile - Devfreq's user device profile
  * @initial_freq	The operating frequency when devfreq_add_device() is
@@ -130,6 +138,7 @@ struct devfreq_governor {
  *			"devfreq_monitor" executions to reevaluate
  *			frequency/voltage of the device. Set by
  *			profile's polling_ms interval.
+ * @freq_table	The frequency table that device supports
  * @data	Private data of the governor. The devfreq framework does not
  *		touch this.
  * @being_removed	a flag to mark that this object is being removed in
@@ -157,6 +166,7 @@ struct devfreq {
 	unsigned long polling_jiffies;
 	unsigned long previous_freq;
 	unsigned int next_polling;
+	struct devfreq_frequency_table *freq_table;
 
 	void *data; /* private data for governors */
 
@@ -180,6 +190,8 @@ extern int devfreq_register_opp_notifier(struct device *dev,
 					 struct devfreq *devfreq);
 extern int devfreq_unregister_opp_notifier(struct device *dev,
 					   struct devfreq *devfreq);
+extern void devfreq_set_freq_table(struct devfreq *devfreq,
+				   struct devfreq_frequency_table *table);
 
 #ifdef CONFIG_DEVFREQ_GOV_POWERSAVE
 extern const struct devfreq_governor devfreq_powersave;
-- 
1.7.0.4

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