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Subject[PATCH 6/8] hwmon: applesmc: Dynamic creation of fan files
Date
With the dynamic temperature group in place, the setup of fans
can be simplified. This patch sets up the fans dynamically, removing
a hundred lines of code.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
---
drivers/hwmon/applesmc.c | 188 +++++++++++-----------------------------------
1 files changed, 43 insertions(+), 145 deletions(-)

diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
index abbff0b..4ba20ec 100644
--- a/drivers/hwmon/applesmc.c
+++ b/drivers/hwmon/applesmc.c
@@ -77,20 +77,15 @@

#define FANS_COUNT "FNum" /* r-o ui8 */
#define FANS_MANUAL "FS! " /* r-w ui16 */
-#define FAN_ACTUAL_SPEED "F0Ac" /* r-o fpe2 (2 bytes) */
-#define FAN_MIN_SPEED "F0Mn" /* r-o fpe2 (2 bytes) */
-#define FAN_MAX_SPEED "F0Mx" /* r-o fpe2 (2 bytes) */
-#define FAN_SAFE_SPEED "F0Sf" /* r-o fpe2 (2 bytes) */
-#define FAN_TARGET_SPEED "F0Tg" /* r-w fpe2 (2 bytes) */
-#define FAN_POSITION "F0ID" /* r-o char[16] */
+#define FAN_ID_FMT "F%dID" /* r-o char[16] */

/* List of keys used to read/write fan speeds */
-static const char* fan_speed_keys[] = {
- FAN_ACTUAL_SPEED,
- FAN_MIN_SPEED,
- FAN_MAX_SPEED,
- FAN_SAFE_SPEED,
- FAN_TARGET_SPEED
+static const char *fan_speed_fmt[] = {
+ "F%dAc", /* actual speed */
+ "F%dMn", /* minimum speed (rw) */
+ "F%dMx", /* maximum speed */
+ "F%dSf", /* safe speed - not all models */
+ "F%dTg", /* target speed (manual: rw) */
};

#define INIT_TIMEOUT_MSECS 5000 /* wait up to 5s for device init ... */
@@ -104,7 +99,8 @@ static const char* fan_speed_keys[] = {
#define SENSOR_Y 1
#define SENSOR_Z 2

-#define to_index(attr) (to_sensor_dev_attr(attr)->index)
+#define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
+#define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)

/* Dynamic device node attributes */
struct applesmc_dev_attr {
@@ -117,6 +113,7 @@ struct applesmc_node_group {
char *format; /* format string */
void *show; /* show function */
void *store; /* store function */
+ int option; /* function argument */
struct applesmc_dev_attr *nodes; /* dynamic node array */
};

@@ -132,6 +129,7 @@ struct applesmc_entry {
static struct applesmc_registers {
struct mutex mutex; /* register read/write mutex */
unsigned int key_count; /* number of SMC registers */
+ unsigned int fan_count; /* number of fans */
unsigned int temp_count; /* number of temperature registers */
unsigned int temp_begin; /* temperature lower index bound */
unsigned int temp_end; /* temperature upper index bound */
@@ -152,9 +150,6 @@ static u8 backlight_state[2];
static struct device *hwmon_dev;
static struct input_polled_dev *applesmc_idev;

-/* The number of fans handled by the driver */
-static unsigned int fans_handled;
-
/*
* Last index written to key_at_index sysfs file, and value to use for all other
* key_at_index_* sysfs files.
@@ -490,27 +485,12 @@ out:
}

/*
- * applesmc_get_fan_count - get the number of fans.
- */
-static int applesmc_get_fan_count(void)
-{
- int ret;
- u8 buffer[1];
-
- ret = applesmc_read_key(FANS_COUNT, buffer, 1);
-
- if (ret)
- return ret;
- else
- return buffer[0];
-}
-
-/*
* applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
*/
static int applesmc_init_smcreg_try(void)
{
struct applesmc_registers *s = &smcreg;
+ u8 tmp[4];
int ret;

if (s->init_complete)
@@ -527,6 +507,11 @@ static int applesmc_init_smcreg_try(void)
if (!s->entry)
return -ENOMEM;

+ ret = applesmc_read_key(FANS_COUNT, tmp, 1);
+ if (ret)
+ return ret;
+ s->fan_count = tmp[0];
+
ret = applesmc_get_lower_bound(&s->temp_begin, "T");
if (ret)
return ret;
@@ -550,8 +535,8 @@ static int applesmc_init_smcreg_try(void)

s->init_complete = true;

- pr_info("key=%d temp=%d acc=%d, light=%d, keyb=%d\n",
- s->key_count, s->temp_count,
+ pr_info("key=%d fan=%d temp=%d acc=%d, light=%d, keyb=%d\n",
+ s->key_count, s->fan_count, s->temp_count,
s->has_accelerometer,
s->has_left_light + s->has_right_light,
s->has_key_light);
@@ -775,14 +760,8 @@ static ssize_t applesmc_show_fan_speed(struct device *dev,
unsigned int speed = 0;
char newkey[5];
u8 buffer[2];
- struct sensor_device_attribute_2 *sensor_attr =
- to_sensor_dev_attr_2(attr);

- newkey[0] = fan_speed_keys[sensor_attr->nr][0];
- newkey[1] = '0' + sensor_attr->index;
- newkey[2] = fan_speed_keys[sensor_attr->nr][2];
- newkey[3] = fan_speed_keys[sensor_attr->nr][3];
- newkey[4] = 0;
+ sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));

ret = applesmc_read_key(newkey, buffer, 2);
speed = ((buffer[0] << 8 | buffer[1]) >> 2);
@@ -801,19 +780,13 @@ static ssize_t applesmc_store_fan_speed(struct device *dev,
u32 speed;
char newkey[5];
u8 buffer[2];
- struct sensor_device_attribute_2 *sensor_attr =
- to_sensor_dev_attr_2(attr);

speed = simple_strtoul(sysfsbuf, NULL, 10);

if (speed > 0x4000) /* Bigger than a 14-bit value */
return -EINVAL;

- newkey[0] = fan_speed_keys[sensor_attr->nr][0];
- newkey[1] = '0' + sensor_attr->index;
- newkey[2] = fan_speed_keys[sensor_attr->nr][2];
- newkey[3] = fan_speed_keys[sensor_attr->nr][3];
- newkey[4] = 0;
+ sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));

buffer[0] = (speed >> 6) & 0xff;
buffer[1] = (speed << 2) & 0xff;
@@ -826,15 +799,14 @@ static ssize_t applesmc_store_fan_speed(struct device *dev,
}

static ssize_t applesmc_show_fan_manual(struct device *dev,
- struct device_attribute *devattr, char *sysfsbuf)
+ struct device_attribute *attr, char *sysfsbuf)
{
int ret;
u16 manual = 0;
u8 buffer[2];
- struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
- manual = ((buffer[0] << 8 | buffer[1]) >> attr->index) & 0x01;
+ manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;

if (ret)
return ret;
@@ -843,14 +815,13 @@ static ssize_t applesmc_show_fan_manual(struct device *dev,
}

static ssize_t applesmc_store_fan_manual(struct device *dev,
- struct device_attribute *devattr,
+ struct device_attribute *attr,
const char *sysfsbuf, size_t count)
{
int ret;
u8 buffer[2];
u32 input;
u16 val;
- struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

input = simple_strtoul(sysfsbuf, NULL, 10);

@@ -860,9 +831,9 @@ static ssize_t applesmc_store_fan_manual(struct device *dev,
goto out;

if (input)
- val = val | (0x01 << attr->index);
+ val = val | (0x01 << to_index(attr));
else
- val = val & ~(0x01 << attr->index);
+ val = val & ~(0x01 << to_index(attr));

buffer[0] = (val >> 8) & 0xFF;
buffer[1] = val & 0xFF;
@@ -882,14 +853,8 @@ static ssize_t applesmc_show_fan_position(struct device *dev,
int ret;
char newkey[5];
u8 buffer[17];
- struct sensor_device_attribute_2 *sensor_attr =
- to_sensor_dev_attr_2(attr);

- newkey[0] = FAN_POSITION[0];
- newkey[1] = '0' + sensor_attr->index;
- newkey[2] = FAN_POSITION[2];
- newkey[3] = FAN_POSITION[3];
- newkey[4] = 0;
+ sprintf(newkey, FAN_ID_FMT, to_index(attr));

ret = applesmc_read_key(newkey, buffer, 16);
buffer[16] = 0;
@@ -1066,62 +1031,15 @@ static struct attribute *key_enumeration_attributes[] = {
static const struct attribute_group key_enumeration_group =
{ .attrs = key_enumeration_attributes };

-/*
- * Macro defining SENSOR_DEVICE_ATTR for a fan sysfs entries.
- * - show actual speed
- * - show/store minimum speed
- * - show maximum speed
- * - show safe speed
- * - show/store target speed
- * - show/store manual mode
- */
-#define sysfs_fan_speeds_offset(offset) \
-static SENSOR_DEVICE_ATTR_2(fan##offset##_input, S_IRUGO, \
- applesmc_show_fan_speed, NULL, 0, offset-1); \
-\
-static SENSOR_DEVICE_ATTR_2(fan##offset##_min, S_IRUGO | S_IWUSR, \
- applesmc_show_fan_speed, applesmc_store_fan_speed, 1, offset-1); \
-\
-static SENSOR_DEVICE_ATTR_2(fan##offset##_max, S_IRUGO, \
- applesmc_show_fan_speed, NULL, 2, offset-1); \
-\
-static SENSOR_DEVICE_ATTR_2(fan##offset##_safe, S_IRUGO, \
- applesmc_show_fan_speed, NULL, 3, offset-1); \
-\
-static SENSOR_DEVICE_ATTR_2(fan##offset##_output, S_IRUGO | S_IWUSR, \
- applesmc_show_fan_speed, applesmc_store_fan_speed, 4, offset-1); \
-\
-static SENSOR_DEVICE_ATTR(fan##offset##_manual, S_IRUGO | S_IWUSR, \
- applesmc_show_fan_manual, applesmc_store_fan_manual, offset-1); \
-\
-static SENSOR_DEVICE_ATTR(fan##offset##_label, S_IRUGO, \
- applesmc_show_fan_position, NULL, offset-1); \
-\
-static struct attribute *fan##offset##_attributes[] = { \
- &sensor_dev_attr_fan##offset##_input.dev_attr.attr, \
- &sensor_dev_attr_fan##offset##_min.dev_attr.attr, \
- &sensor_dev_attr_fan##offset##_max.dev_attr.attr, \
- &sensor_dev_attr_fan##offset##_safe.dev_attr.attr, \
- &sensor_dev_attr_fan##offset##_output.dev_attr.attr, \
- &sensor_dev_attr_fan##offset##_manual.dev_attr.attr, \
- &sensor_dev_attr_fan##offset##_label.dev_attr.attr, \
- NULL \
-};
-
-/*
- * Create the needed functions for each fan using the macro defined above
- * (4 fans are supported)
- */
-sysfs_fan_speeds_offset(1);
-sysfs_fan_speeds_offset(2);
-sysfs_fan_speeds_offset(3);
-sysfs_fan_speeds_offset(4);
-
-static const struct attribute_group fan_attribute_groups[] = {
- { .attrs = fan1_attributes },
- { .attrs = fan2_attributes },
- { .attrs = fan3_attributes },
- { .attrs = fan4_attributes },
+static struct applesmc_node_group fan_group[] = {
+ { "fan%d_label", applesmc_show_fan_position },
+ { "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
+ { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
+ { "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
+ { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
+ { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
+ { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
+ { }
};

static struct applesmc_node_group temp_group[] = {
@@ -1168,7 +1086,7 @@ static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
for (i = 0; i < num; i++) {
node = &grp->nodes[i];
sprintf(node->name, grp->format, i + 1);
- node->sda.index = i;
+ node->sda.index = (grp->option << 16) | (i & 0xffff);
node->sda.dev_attr.show = grp->show;
node->sda.dev_attr.store = grp->store;
attr = &node->sda.dev_attr.attr;
@@ -1286,7 +1204,6 @@ static __initdata struct dmi_system_id applesmc_whitelist[] = {
static int __init applesmc_init(void)
{
int ret;
- int count;

if (!dmi_check_system(applesmc_whitelist)) {
pr_warn("supported laptop not found!\n");
@@ -1325,25 +1242,9 @@ static int __init applesmc_init(void)
if (ret)
goto out_name;

- /* create fan files */
- count = applesmc_get_fan_count();
- if (count < 0)
- pr_err("Cannot get the number of fans\n");
- else
- pr_info("%d fans found\n", count);
-
- if (count > 4) {
- count = 4;
- pr_warn("A maximum of 4 fans are supported by this driver\n");
- }
-
- while (fans_handled < count) {
- ret = sysfs_create_group(&pdev->dev.kobj,
- &fan_attribute_groups[fans_handled]);
- if (ret)
- goto out_fans;
- fans_handled++;
- }
+ ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
+ if (ret)
+ goto out_info;

ret = applesmc_create_nodes(temp_group, smcreg.temp_count);
if (ret)
@@ -1401,9 +1302,8 @@ out_accelerometer:
out_temperature:
applesmc_destroy_nodes(temp_group);
out_fans:
- while (fans_handled)
- sysfs_remove_group(&pdev->dev.kobj,
- &fan_attribute_groups[--fans_handled]);
+ applesmc_destroy_nodes(fan_group);
+out_info:
sysfs_remove_group(&pdev->dev.kobj, &key_enumeration_group);
out_name:
sysfs_remove_file(&pdev->dev.kobj, &dev_attr_name.attr);
@@ -1432,9 +1332,7 @@ static void __exit applesmc_exit(void)
if (smcreg.has_accelerometer)
applesmc_release_accelerometer();
applesmc_destroy_nodes(temp_group);
- while (fans_handled)
- sysfs_remove_group(&pdev->dev.kobj,
- &fan_attribute_groups[--fans_handled]);
+ applesmc_destroy_nodes(fan_group);
sysfs_remove_group(&pdev->dev.kobj, &key_enumeration_group);
sysfs_remove_file(&pdev->dev.kobj, &dev_attr_name.attr);
applesmc_destroy_smcreg();
--
1.7.1


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