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Date: Mon, 16 Jul 2012 09:18:11 +0200
From: "Henrik Rydberg" <rydberg@...omail.se>
To: Guenter Roeck <guenter.roeck@...csson.com>
Cc: Jean Delvare <khali@...ux-fr.org>, lm-sensors@...sensors.org,
linux-kernel@...r.kernel.org, Henrik Rydberg <rydberg@...omail.se>
Subject: [PATCH 2/2] hwmon: (applesmc) Ignore some temperature registers
Not all sensors in the T range are useful temperatures. This patch
creates a subset of sensors to be exported to userland, excluding the
unknown types.
Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
---
drivers/hwmon/applesmc.c | 75 ++++++++++++++++++++++++++++++------------------
1 file changed, 47 insertions(+), 28 deletions(-)
diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
index 75f87f1..4d937a1 100644
--- a/drivers/hwmon/applesmc.c
+++ b/drivers/hwmon/applesmc.c
@@ -133,11 +133,13 @@ static struct applesmc_registers {
unsigned int temp_count; /* number of temperature registers */
unsigned int temp_begin; /* temperature lower index bound */
unsigned int temp_end; /* temperature upper index bound */
+ unsigned int index_count; /* size of temperature index array */
int num_light_sensors; /* number of light sensors */
bool has_accelerometer; /* has motion sensor */
bool has_key_backlight; /* has keyboard backlight */
bool init_complete; /* true when fully initialized */
struct applesmc_entry *cache; /* cached key entries */
+ const char **index; /* temperature key index */
} smcreg = {
.mutex = __MUTEX_INITIALIZER(smcreg.mutex),
};
@@ -469,6 +471,30 @@ static void applesmc_device_init(void)
pr_warn("failed to init the device\n");
}
+static int applesmc_init_index(struct applesmc_registers *s)
+{
+ const struct applesmc_entry *entry;
+ unsigned int i;
+
+ if (s->index)
+ return 0;
+
+ s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
+ if (!s->index)
+ return -ENOMEM;
+
+ for (i = s->temp_begin; i < s->temp_end; i++) {
+ entry = applesmc_get_entry_by_index(i);
+ if (IS_ERR(entry))
+ continue;
+ if (strcmp(entry->type, TEMP_SENSOR_TYPE))
+ continue;
+ s->index[s->index_count++] = entry->key;
+ }
+
+ return 0;
+}
+
/*
* applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
*/
@@ -504,6 +530,10 @@ static int applesmc_init_smcreg_try(void)
return ret;
s->temp_count = s->temp_end - s->temp_begin;
+ ret = applesmc_init_index(s);
+ if (ret)
+ return ret;
+
ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
if (ret)
return ret;
@@ -520,8 +550,8 @@ static int applesmc_init_smcreg_try(void)
s->num_light_sensors = left_light_sensor + right_light_sensor;
s->init_complete = true;
- pr_info("key=%d fan=%d temp=%d acc=%d lux=%d kbd=%d\n",
- s->key_count, s->fan_count, s->temp_count,
+ pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
+ s->key_count, s->fan_count, s->temp_count, s->index_count,
s->has_accelerometer,
s->num_light_sensors,
s->has_key_backlight);
@@ -529,6 +559,15 @@ static int applesmc_init_smcreg_try(void)
return 0;
}
+static void applesmc_destroy_smcreg(void)
+{
+ kfree(smcreg.index);
+ smcreg.index = NULL;
+ kfree(smcreg.cache);
+ smcreg.cache = NULL;
+ smcreg.init_complete = false;
+}
+
/*
* applesmc_init_smcreg - Initialize register cache.
*
@@ -549,19 +588,11 @@ static int applesmc_init_smcreg(void)
msleep(INIT_WAIT_MSECS);
}
- kfree(smcreg.cache);
- smcreg.cache = NULL;
+ applesmc_destroy_smcreg();
return ret;
}
-static void applesmc_destroy_smcreg(void)
-{
- kfree(smcreg.cache);
- smcreg.cache = NULL;
- smcreg.init_complete = false;
-}
-
/* Device model stuff */
static int applesmc_probe(struct platform_device *dev)
{
@@ -705,33 +736,21 @@ out:
static ssize_t applesmc_show_sensor_label(struct device *dev,
struct device_attribute *devattr, char *sysfsbuf)
{
- int index = smcreg.temp_begin + to_index(devattr);
- const struct applesmc_entry *entry;
+ const char *key = smcreg.index[to_index(devattr)];
- entry = applesmc_get_entry_by_index(index);
- if (IS_ERR(entry))
- return PTR_ERR(entry);
-
- return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
+ return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key);
}
/* Displays degree Celsius * 1000 */
static ssize_t applesmc_show_temperature(struct device *dev,
struct device_attribute *devattr, char *sysfsbuf)
{
- int index = smcreg.temp_begin + to_index(devattr);
- const struct applesmc_entry *entry;
+ const char *key = smcreg.index[to_index(devattr)];
int ret;
s16 value;
int temp;
- entry = applesmc_get_entry_by_index(index);
- if (IS_ERR(entry))
- return PTR_ERR(entry);
- if (strcmp(entry->type, TEMP_SENSOR_TYPE))
- return -EINVAL;
-
- ret = applesmc_read_s16(entry->key, &value);
+ ret = applesmc_read_s16(key, &value);
if (ret)
return ret;
@@ -1247,7 +1266,7 @@ static int __init applesmc_init(void)
if (ret)
goto out_info;
- ret = applesmc_create_nodes(temp_group, smcreg.temp_count);
+ ret = applesmc_create_nodes(temp_group, smcreg.index_count);
if (ret)
goto out_fans;
--
1.7.11.2
--
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