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SubjectFwd: [PATCH] cpufreq (6/7): allow cpufreq drivers to export sysfs files
----- Forwarded message from Dominik Brodowski <linux@brodo.de> -----

From: Dominik Brodowski <linux@brodo.de>
To: torvalds@transmeta.com
Cc: cpufreq@www.linux.org.uk
Subject: [PATCH] cpufreq (6/7): allow cpufreq drivers to export sysfs files
Date: Fri, 7 Mar 2003 11:09:22 +0100

This patch lets cpufreq drivers export per-CPU files in the cpufreq and
cpu-specific sysfs directory. As an example, a file
"scaling_available_frequencies" is added to the p4-clockmod.c driver.

Please apply,
Dominik

arch/i386/kernel/cpu/cpufreq/p4-clockmod.c | 7 ++++
drivers/cpufreq/freq_table.c | 50 +++++++++++++++++++++++++++++
include/linux/cpufreq.h | 12 ++++++
kernel/cpufreq.c | 9 ++++-
4 files changed, 77 insertions(+), 1 deletion(-)

diff -ru linux-original/arch/i386/kernel/cpu/cpufreq/p4-clockmod.c linux/arch/i386/kernel/cpu/cpufreq/p4-clockmod.c
--- linux-original/arch/i386/kernel/cpu/cpufreq/p4-clockmod.c 2003-03-06 21:56:18.000000000 +0100
+++ linux/arch/i386/kernel/cpu/cpufreq/p4-clockmod.c 2003-03-06 23:00:27.000000000 +0100
@@ -214,6 +214,7 @@
else
p4clockmod_table[i].frequency = (stock_freq * i)/8;
}
+ cpufreq_frequency_table_get_attr(p4clockmod_table, policy->cpu);

/* cpuinfo and default policy values */
policy->policy = CPUFREQ_POLICY_PERFORMANCE;
@@ -226,9 +227,14 @@

static int cpufreq_p4_cpu_exit(struct cpufreq_policy *policy)
{
+ cpufreq_frequency_table_put_attr(policy->cpu);
return cpufreq_p4_setdc(policy->cpu, DC_DISABLE);
}

+static struct freq_attr* p4clockmod_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};

static struct cpufreq_driver p4clockmod_driver = {
.verify = cpufreq_p4_verify,
@@ -237,6 +243,7 @@
.exit = cpufreq_p4_cpu_exit,
.name = "p4-clockmod",
.owner = THIS_MODULE,
+ .attr = p4clockmod_attr,
};


diff -ru linux-original/drivers/cpufreq/freq_table.c linux/drivers/cpufreq/freq_table.c
--- linux-original/drivers/cpufreq/freq_table.c 2003-03-06 21:19:04.000000000 +0100
+++ linux/drivers/cpufreq/freq_table.c 2003-03-06 23:00:21.000000000 +0100
@@ -147,6 +147,56 @@
}
EXPORT_SYMBOL_GPL(cpufreq_frequency_table_target);

+static struct cpufreq_frequency_table *show_table[NR_CPUS];
+/**
+ * show_scaling_governor - show the current policy for the specified CPU
+ */
+static ssize_t show_available_freqs (struct cpufreq_policy *policy, char *buf)
+{
+ unsigned int i = 0;
+ unsigned int cpu = policy->cpu;
+ ssize_t count = 0;
+ struct cpufreq_frequency_table *table;
+
+ if (!show_table[cpu])
+ return -ENODEV;
+
+ table = show_table[cpu];
+
+ for (i=0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
+ if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
+ continue;
+ count += sprintf(&buf[count], "%d ", table[i].frequency);
+ }
+ count += sprintf(&buf[count], "\n");
+
+ return count;
+
+}
+
+struct freq_attr cpufreq_freq_attr_scaling_available_freqs = {
+ .attr = { .name = "scaling_available_frequencies", .mode = 0444 },
+ .show = show_available_freqs,
+};
+EXPORT_SYMBOL_GPL(cpufreq_freq_attr_scaling_available_freqs);
+
+/*
+ * if you use these, you must assure that the frequency table is valid
+ * all the time between get_attr and put_attr!
+ */
+void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
+ unsigned int cpu)
+{
+ show_table[cpu] = table;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_get_attr);
+
+void cpufreq_frequency_table_put_attr(unsigned int cpu)
+{
+ show_table[cpu] = NULL;
+}
+EXPORT_SYMBOL_GPL(cpufreq_frequency_table_put_attr);
+

MODULE_AUTHOR ("Dominik Brodowski <linux@brodo.de>");
MODULE_DESCRIPTION ("CPUfreq frequency table helpers");
diff -ru linux-original/include/linux/cpufreq.h linux/include/linux/cpufreq.h
--- linux-original/include/linux/cpufreq.h 2003-03-06 21:56:18.000000000 +0100
+++ linux/include/linux/cpufreq.h 2003-03-06 23:00:41.000000000 +0100
@@ -152,6 +152,8 @@
#define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */
#define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */

+struct freq_attr;
+
struct cpufreq_driver {
/* needed by all drivers */
int (*verify) (struct cpufreq_policy *policy);
@@ -166,6 +168,7 @@
/* optional, for the moment */
int (*init) (struct cpufreq_policy *policy);
int (*exit) (struct cpufreq_policy *policy);
+ struct freq_attr **attr;
};

int cpufreq_register_driver(struct cpufreq_driver *driver_data);
@@ -298,6 +301,15 @@
unsigned int relation,
unsigned int *index);

+/* the following are really really optional */
+extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
+
+void cpufreq_frequency_table_get_attr(struct cpufreq_frequency_table *table,
+ unsigned int cpu);
+
+void cpufreq_frequency_table_put_attr(unsigned int cpu);
+
+
#endif /* CONFIG_CPU_FREQ_TABLE */

#endif /* _LINUX_CPUFREQ_H */
diff -ru linux-original/kernel/cpufreq.c linux/kernel/cpufreq.c
--- linux-original/kernel/cpufreq.c 2003-03-06 21:56:18.000000000 +0100
+++ linux/kernel/cpufreq.c 2003-03-06 23:02:20.000000000 +0100
@@ -340,6 +340,7 @@
int ret = 0;
struct cpufreq_policy new_policy;
struct cpufreq_policy *policy;
+ struct freq_attr **drv_attr;

if (!kset_get(&cpufreq_interface.kset))
return -EINVAL;
@@ -378,7 +379,13 @@
ret = kobject_register(&policy->kobj);
if (ret)
goto out;
-
+
+ drv_attr = cpufreq_driver->attr;
+ while ((drv_attr) && (*drv_attr)) {
+ sysfs_create_file(&policy->kobj, &((*drv_attr)->attr));
+ drv_attr++;
+ }
+
/* set default policy */
ret = cpufreq_set_policy(&new_policy);
if (ret)
_______________________________________________
Cpufreq mailing list
Cpufreq@www.linux.org.uk
http://www.linux.org.uk/mailman/listinfo/cpufreq
----- End forwarded message -----
--
Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html

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