lis3: remove automatic shutdown of the device
After measurement on my laptop, it seems that turning off the device does
not bring any energy saving (within 0.1W precision). So let's keep the
device always on. It simplifies the code, and it avoids the problem of
reading a wrong value sometimes just after turning the device on.
Moreover, since commit ef2cfc790bf5f0ff189b01eabc0f4feb5e8524df had been
too zealous, the device was actually never turned off anyway. This patch
also restores the damages done by this commit concerning the
initialisation/poweroff.
Also do more clean up with the usage of the lis3_dev global variable.
Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/hwmon/hp_accel.c b/drivers/hwmon/hp_accel.c
index abca7e9..0ebd009 100644
--- a/drivers/hwmon/hp_accel.c
+++ b/drivers/hwmon/hp_accel.c
@@ -324,7 +324,7 @@
flush_work(&hpled_led.work);
led_classdev_unregister(&hpled_led.led_classdev);
- return lis3lv02d_remove_fs();
+ return lis3lv02d_remove_fs(&lis3_dev);
}
@@ -338,13 +338,7 @@
static int lis3lv02d_resume(struct acpi_device *device)
{
- /* put back the device in the right state (ACPI might turn it on) */
- mutex_lock(&lis3_dev.lock);
- if (lis3_dev.usage > 0)
- lis3lv02d_poweron(&lis3_dev);
- else
- lis3lv02d_poweroff(&lis3_dev);
- mutex_unlock(&lis3_dev.lock);
+ lis3lv02d_poweron(&lis3_dev);
return 0;
}
#else
diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
index 17f2003..df3f586 100644
--- a/drivers/hwmon/lis3lv02d.c
+++ b/drivers/hwmon/lis3lv02d.c
@@ -105,56 +105,39 @@
{
int position[3];
- position[0] = lis3_dev.read_data(lis3, OUTX);
- position[1] = lis3_dev.read_data(lis3, OUTY);
- position[2] = lis3_dev.read_data(lis3, OUTZ);
+ position[0] = lis3->read_data(lis3, OUTX);
+ position[1] = lis3->read_data(lis3, OUTY);
+ position[2] = lis3->read_data(lis3, OUTZ);
- *x = lis3lv02d_get_axis(lis3_dev.ac.x, position);
- *y = lis3lv02d_get_axis(lis3_dev.ac.y, position);
- *z = lis3lv02d_get_axis(lis3_dev.ac.z, position);
+ *x = lis3lv02d_get_axis(lis3->ac.x, position);
+ *y = lis3lv02d_get_axis(lis3->ac.y, position);
+ *z = lis3lv02d_get_axis(lis3->ac.z, position);
}
void lis3lv02d_poweroff(struct lis3lv02d *lis3)
{
- lis3_dev.is_on = 0;
+ /* disable X,Y,Z axis and power down */
+ lis3->write(lis3, CTRL_REG1, 0x00);
}
EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
void lis3lv02d_poweron(struct lis3lv02d *lis3)
{
- lis3_dev.is_on = 1;
- lis3_dev.init(lis3);
+ u8 reg;
+
+ lis3->init(lis3);
+
+ /*
+ * Common configuration
+ * BDU: LSB and MSB values are not updated until both have been read.
+ * So the value read will always be correct.
+ */
+ lis3->read(lis3, CTRL_REG2, ®);
+ reg |= CTRL2_BDU;
+ lis3->write(lis3, CTRL_REG2, reg);
}
EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
-/*
- * To be called before starting to use the device. It makes sure that the
- * device will always be on until a call to lis3lv02d_decrease_use(). Not to be
- * used from interrupt context.
- */
-static void lis3lv02d_increase_use(struct lis3lv02d *dev)
-{
- mutex_lock(&dev->lock);
- dev->usage++;
- if (dev->usage == 1) {
- if (!dev->is_on)
- lis3lv02d_poweron(dev);
- }
- mutex_unlock(&dev->lock);
-}
-
-/*
- * To be called whenever a usage of the device is stopped.
- * It will make sure to turn off the device when there is not usage.
- */
-static void lis3lv02d_decrease_use(struct lis3lv02d *dev)
-{
- mutex_lock(&dev->lock);
- dev->usage--;
- if (dev->usage == 0)
- lis3lv02d_poweroff(dev);
- mutex_unlock(&dev->lock);
-}
static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
{
@@ -198,14 +181,12 @@
printk(KERN_ERR DRIVER_NAME ": IRQ%d allocation failed\n", lis3_dev.irq);
return -EBUSY;
}
- lis3lv02d_increase_use(&lis3_dev);
return 0;
}
static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
{
fasync_helper(-1, file, 0, &lis3_dev.async_queue);
- lis3lv02d_decrease_use(&lis3_dev);
free_irq(lis3_dev.irq, &lis3_dev);
clear_bit(0, &lis3_dev.misc_opened); /* release the device */
return 0;
@@ -314,10 +295,8 @@
static int lis3lv02d_joystick_open(struct input_dev *input)
{
- lis3lv02d_increase_use(&lis3_dev);
lis3_dev.kthread = kthread_run(lis3lv02d_joystick_kthread, NULL, "klis3lv02d");
if (IS_ERR(lis3_dev.kthread)) {
- lis3lv02d_decrease_use(&lis3_dev);
return PTR_ERR(lis3_dev.kthread);
}
@@ -327,7 +306,6 @@
static void lis3lv02d_joystick_close(struct input_dev *input)
{
kthread_stop(lis3_dev.kthread);
- lis3lv02d_decrease_use(&lis3_dev);
}
static inline void lis3lv02d_calibrate_joystick(void)
@@ -390,9 +368,7 @@
{
int x, y, z;
- lis3lv02d_increase_use(&lis3_dev);
lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
- lis3lv02d_decrease_use(&lis3_dev);
return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
}
@@ -406,9 +382,7 @@
struct device_attribute *attr,
const char *buf, size_t count)
{
- lis3lv02d_increase_use(&lis3_dev);
lis3lv02d_calibrate_joystick();
- lis3lv02d_decrease_use(&lis3_dev);
return count;
}
@@ -420,9 +394,7 @@
u8 ctrl;
int val;
- lis3lv02d_increase_use(&lis3_dev);
lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
- lis3lv02d_decrease_use(&lis3_dev);
val = (ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4;
return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]);
}
@@ -446,17 +418,17 @@
static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
{
- lis3_dev.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
- if (IS_ERR(lis3_dev.pdev))
- return PTR_ERR(lis3_dev.pdev);
+ lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
+ if (IS_ERR(lis3->pdev))
+ return PTR_ERR(lis3->pdev);
- return sysfs_create_group(&lis3_dev.pdev->dev.kobj, &lis3lv02d_attribute_group);
+ return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
}
-int lis3lv02d_remove_fs(void)
+int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
{
- sysfs_remove_group(&lis3_dev.pdev->dev.kobj, &lis3lv02d_attribute_group);
- platform_device_unregister(lis3_dev.pdev);
+ sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
+ platform_device_unregister(lis3->pdev);
return 0;
}
EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
@@ -482,13 +454,12 @@
break;
default:
printk(KERN_ERR DRIVER_NAME
- ": unknown sensor type 0x%X\n", lis3_dev.whoami);
+ ": unknown sensor type 0x%X\n", dev->whoami);
return -EINVAL;
}
- mutex_init(&dev->lock);
lis3lv02d_add_fs(dev);
- lis3lv02d_increase_use(dev);
+ lis3lv02d_poweron(dev);
if (lis3lv02d_joystick_enable())
printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");
@@ -503,7 +474,6 @@
if (misc_register(&lis3lv02d_misc_device))
printk(KERN_ERR DRIVER_NAME ": misc_register failed\n");
out:
- lis3lv02d_decrease_use(dev);
return 0;
}
EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
index 745ec96..b007d81 100644
--- a/drivers/hwmon/lis3lv02d.h
+++ b/drivers/hwmon/lis3lv02d.h
@@ -171,14 +171,11 @@
struct input_dev *idev; /* input device */
struct task_struct *kthread; /* kthread for input */
- struct mutex lock;
struct platform_device *pdev; /* platform device */
atomic_t count; /* interrupt count after last read */
int xcalib; /* calibrated null value for x */
int ycalib; /* calibrated null value for y */
int zcalib; /* calibrated null value for z */
- unsigned char is_on; /* whether the device is on or off */
- unsigned char usage; /* usage counter */
struct axis_conversion ac; /* hw -> logical axis */
u32 irq; /* IRQ number */
@@ -192,6 +189,6 @@
void lis3lv02d_joystick_disable(void);
void lis3lv02d_poweroff(struct lis3lv02d *lis3);
void lis3lv02d_poweron(struct lis3lv02d *lis3);
-int lis3lv02d_remove_fs(void);
+int lis3lv02d_remove_fs(struct lis3lv02d *lis3);
extern struct lis3lv02d lis3_dev;