*
* Copyright (C) 2007-2008 Yan Burman
* Copyright (C) 2008 Eric Piel
+ * Copyright (C) 2008-2009 Pavel Machek
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <linux/poll.h>
#include <linux/freezer.h>
#include <linux/uaccess.h>
+#include <linux/miscdevice.h>
#include <acpi/acpi_drivers.h>
#include <asm/atomic.h>
#include "lis3lv02d.h"
#define DRIVER_NAME "lis3lv02d"
-#define ACPI_MDPS_CLASS "accelerometer"
/* joystick device poll interval in milliseconds */
#define MDPS_POLL_INTERVAL 50
* joystick.
*/
-/* Maximum value our axis may get for the input device (signed 12 bits) */
-#define MDPS_MAX_VAL 2048
-
-struct axis_conversion {
- s8 x;
- s8 y;
- s8 z;
-};
-
-struct acpi_lis3lv02d {
- struct acpi_device *device; /* The ACPI device */
- 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 */
+struct acpi_lis3lv02d adev = {
+ .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(adev.misc_wait),
};
-static struct acpi_lis3lv02d adev;
+EXPORT_SYMBOL_GPL(adev);
-static int lis3lv02d_remove_fs(void);
static int lis3lv02d_add_fs(struct acpi_device *device);
-/* For automatic insertion of the module */
-static struct acpi_device_id lis3lv02d_device_ids[] = {
- {"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
- {"", 0},
-};
-MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);
-
-/**
- * lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
- * @handle: the handle of the device
- *
- * Returns AE_OK on success.
- */
-static inline acpi_status lis3lv02d_acpi_init(acpi_handle handle)
-{
- return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
-}
-
-/**
- * lis3lv02d_acpi_read - ACPI ALRD method: read a register
- * @handle: the handle of the device
- * @reg: the register to read
- * @ret: result of the operation
- *
- * Returns AE_OK on success.
- */
-static acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
-{
- union acpi_object arg0 = { ACPI_TYPE_INTEGER };
- struct acpi_object_list args = { 1, &arg0 };
- unsigned long long lret;
- acpi_status status;
-
- arg0.integer.value = reg;
-
- status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
- *ret = lret;
- return status;
-}
-
-/**
- * lis3lv02d_acpi_write - ACPI ALWR method: write to a register
- * @handle: the handle of the device
- * @reg: the register to write to
- * @val: the value to write
- *
- * Returns AE_OK on success.
- */
-static acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
-{
- unsigned long long ret; /* Not used when writting */
- union acpi_object in_obj[2];
- struct acpi_object_list args = { 2, in_obj };
-
- in_obj[0].type = ACPI_TYPE_INTEGER;
- in_obj[0].integer.value = reg;
- in_obj[1].type = ACPI_TYPE_INTEGER;
- in_obj[1].integer.value = val;
-
- return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
-}
-
-static s16 lis3lv02d_read_16(acpi_handle handle, int reg)
-{
- u8 lo, hi;
-
- lis3lv02d_acpi_read(handle, reg, &lo);
- lis3lv02d_acpi_read(handle, reg + 1, &hi);
- /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
- return (s16)((hi << 8) | lo);
-}
-
/**
* lis3lv02d_get_axis - For the given axis, give the value converted
* @axis: 1,2,3 - can also be negative
{
int position[3];
- position[0] = lis3lv02d_read_16(handle, OUTX_L);
- position[1] = lis3lv02d_read_16(handle, OUTY_L);
- position[2] = lis3lv02d_read_16(handle, OUTZ_L);
+ position[0] = adev.read_data(handle, OUTX);
+ position[1] = adev.read_data(handle, OUTY);
+ position[2] = adev.read_data(handle, OUTZ);
*x = lis3lv02d_get_axis(adev.ac.x, position);
*y = lis3lv02d_get_axis(adev.ac.y, position);
*z = lis3lv02d_get_axis(adev.ac.z, position);
}
-static inline void lis3lv02d_poweroff(acpi_handle handle)
+void lis3lv02d_poweroff(acpi_handle handle)
{
adev.is_on = 0;
- /* disable X,Y,Z axis and power down */
- lis3lv02d_acpi_write(handle, CTRL_REG1, 0x00);
}
+EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
-static void lis3lv02d_poweron(acpi_handle handle)
+void lis3lv02d_poweron(acpi_handle handle)
{
- u8 val;
-
adev.is_on = 1;
- lis3lv02d_acpi_init(handle);
- lis3lv02d_acpi_write(handle, FF_WU_CFG, 0);
- /*
- * BDU: LSB and MSB values are not updated until both have been read.
- * So the value read will always be correct.
- * IEN: Interrupt for free-fall and DD, not for data-ready.
- */
- lis3lv02d_acpi_read(handle, CTRL_REG2, &val);
- val |= CTRL2_BDU | CTRL2_IEN;
- lis3lv02d_acpi_write(handle, CTRL_REG2, val);
-}
-
-#ifdef CONFIG_PM
-static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
-{
- /* make sure the device is off when we suspend */
- lis3lv02d_poweroff(device->handle);
- return 0;
+ adev.init(handle);
}
-
-static int lis3lv02d_resume(struct acpi_device *device)
-{
- /* put back the device in the right state (ACPI might turn it on) */
- mutex_lock(&adev.lock);
- if (adev.usage > 0)
- lis3lv02d_poweron(device->handle);
- else
- lis3lv02d_poweroff(device->handle);
- mutex_unlock(&adev.lock);
- return 0;
-}
-#else
-#define lis3lv02d_suspend NULL
-#define lis3lv02d_resume NULL
-#endif
-
+EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
/*
* To be called before starting to use the device. It makes sure that the
mutex_unlock(&dev->lock);
}
+static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
+{
+ /*
+ * Be careful: on some HP laptops the bios force DD when on battery and
+ * the lid is closed. This leads to interrupts as soon as a little move
+ * is done.
+ */
+ atomic_inc(&adev.count);
+
+ wake_up_interruptible(&adev.misc_wait);
+ kill_fasync(&adev.async_queue, SIGIO, POLL_IN);
+ return IRQ_HANDLED;
+}
+
+static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
+{
+ int ret;
+
+ if (test_and_set_bit(0, &adev.misc_opened))
+ return -EBUSY; /* already open */
+
+ atomic_set(&adev.count, 0);
+
+ /*
+ * The sensor can generate interrupts for free-fall and direction
+ * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
+ * the things simple and _fast_ we activate it only for free-fall, so
+ * no need to read register (very slow with ACPI). For the same reason,
+ * we forbid shared interrupts.
+ *
+ * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
+ * io-apic is not configurable (and generates a warning) but I keep it
+ * in case of support for other hardware.
+ */
+ ret = request_irq(adev.irq, lis302dl_interrupt, IRQF_TRIGGER_RISING,
+ DRIVER_NAME, &adev);
+
+ if (ret) {
+ clear_bit(0, &adev.misc_opened);
+ printk(KERN_ERR DRIVER_NAME ": IRQ%d allocation failed\n", adev.irq);
+ return -EBUSY;
+ }
+ lis3lv02d_increase_use(&adev);
+ printk("lis3: registered interrupt %d\n", adev.irq);
+ return 0;
+}
+
+static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
+{
+ fasync_helper(-1, file, 0, &adev.async_queue);
+ lis3lv02d_decrease_use(&adev);
+ free_irq(adev.irq, &adev);
+ clear_bit(0, &adev.misc_opened); /* release the device */
+ return 0;
+}
+
+static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
+ size_t count, loff_t *pos)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ u32 data;
+ unsigned char byte_data;
+ ssize_t retval = 1;
+
+ if (count < 1)
+ return -EINVAL;
+
+ add_wait_queue(&adev.misc_wait, &wait);
+ while (true) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ data = atomic_xchg(&adev.count, 0);
+ if (data)
+ break;
+
+ if (file->f_flags & O_NONBLOCK) {
+ retval = -EAGAIN;
+ goto out;
+ }
+
+ if (signal_pending(current)) {
+ retval = -ERESTARTSYS;
+ goto out;
+ }
+
+ schedule();
+ }
+
+ if (data < 255)
+ byte_data = data;
+ else
+ byte_data = 255;
+
+ /* make sure we are not going into copy_to_user() with
+ * TASK_INTERRUPTIBLE state */
+ set_current_state(TASK_RUNNING);
+ if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
+ retval = -EFAULT;
+
+out:
+ __set_current_state(TASK_RUNNING);
+ remove_wait_queue(&adev.misc_wait, &wait);
+
+ return retval;
+}
+
+static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
+{
+ poll_wait(file, &adev.misc_wait, wait);
+ if (atomic_read(&adev.count))
+ return POLLIN | POLLRDNORM;
+ return 0;
+}
+
+static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
+{
+ return fasync_helper(fd, file, on, &adev.async_queue);
+}
+
+static const struct file_operations lis3lv02d_misc_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = lis3lv02d_misc_read,
+ .open = lis3lv02d_misc_open,
+ .release = lis3lv02d_misc_release,
+ .poll = lis3lv02d_misc_poll,
+ .fasync = lis3lv02d_misc_fasync,
+};
+
+static struct miscdevice lis3lv02d_misc_device = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "freefall",
+ .fops = &lis3lv02d_misc_fops,
+};
+
/**
* lis3lv02d_joystick_kthread - Kthread polling function
* @data: unused - here to conform to threadfn prototype
lis3lv02d_decrease_use(&adev);
}
-
static inline void lis3lv02d_calibrate_joystick(void)
{
lis3lv02d_get_xyz(adev.device->handle, &adev.xcalib, &adev.ycalib, &adev.zcalib);
}
-static int lis3lv02d_joystick_enable(void)
+int lis3lv02d_joystick_enable(void)
{
int err;
adev.idev->close = lis3lv02d_joystick_close;
set_bit(EV_ABS, adev.idev->evbit);
- input_set_abs_params(adev.idev, ABS_X, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
- input_set_abs_params(adev.idev, ABS_Y, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
- input_set_abs_params(adev.idev, ABS_Z, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
+ input_set_abs_params(adev.idev, ABS_X, -adev.mdps_max_val, adev.mdps_max_val, 3, 3);
+ input_set_abs_params(adev.idev, ABS_Y, -adev.mdps_max_val, adev.mdps_max_val, 3, 3);
+ input_set_abs_params(adev.idev, ABS_Z, -adev.mdps_max_val, adev.mdps_max_val, 3, 3);
err = input_register_device(adev.idev);
if (err) {
return err;
}
+EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
-static void lis3lv02d_joystick_disable(void)
+void lis3lv02d_joystick_disable(void)
{
if (!adev.idev)
return;
+ misc_deregister(&lis3lv02d_misc_device);
input_unregister_device(adev.idev);
adev.idev = NULL;
}
-
+EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
/*
* Initialise the accelerometer and the various subsystems.
* Should be rather independant of the bus system.
*/
-static int lis3lv02d_init_device(struct acpi_lis3lv02d *dev)
+int lis3lv02d_init_device(struct acpi_lis3lv02d *dev)
{
mutex_init(&dev->lock);
lis3lv02d_add_fs(dev->device);
if (lis3lv02d_joystick_enable())
printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");
- lis3lv02d_decrease_use(dev);
- return 0;
-}
-
-static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
-{
- adev.ac = *((struct axis_conversion *)dmi->driver_data);
- printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident);
+ printk("lis3_init_device: irq %d\n", dev->irq);
- return 1;
-}
-
-/* Represents, for each axis seen by userspace, the corresponding hw axis (+1).
- * If the value is negative, the opposite of the hw value is used. */
-static struct axis_conversion lis3lv02d_axis_normal = {1, 2, 3};
-static struct axis_conversion lis3lv02d_axis_y_inverted = {1, -2, 3};
-static struct axis_conversion lis3lv02d_axis_x_inverted = {-1, 2, 3};
-static struct axis_conversion lis3lv02d_axis_z_inverted = {1, 2, -3};
-static struct axis_conversion lis3lv02d_axis_xy_rotated_left = {-2, 1, 3};
-static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};
-
-#define AXIS_DMI_MATCH(_ident, _name, _axis) { \
- .ident = _ident, \
- .callback = lis3lv02d_dmi_matched, \
- .matches = { \
- DMI_MATCH(DMI_PRODUCT_NAME, _name) \
- }, \
- .driver_data = &lis3lv02d_axis_##_axis \
-}
-static struct dmi_system_id lis3lv02d_dmi_ids[] = {
- /* product names are truncated to match all kinds of a same model */
- AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted),
- AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted),
- AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted),
- AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted),
- AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted),
- AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted),
- AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left),
- { NULL, }
-/* Laptop models without axis info (yet):
- * "NC651xx" "HP Compaq 651"
- * "NC671xx" "HP Compaq 671"
- * "NC6910" "HP Compaq 6910"
- * HP Compaq 8710x Notebook PC / Mobile Workstation
- * "NC2400" "HP Compaq nc2400"
- * "NX74x0" "HP Compaq nx74"
- * "NX6325" "HP Compaq nx6325"
- * "NC4400" "HP Compaq nc4400"
- */
-};
-
-static int lis3lv02d_add(struct acpi_device *device)
-{
- u8 val;
-
- if (!device)
- return -EINVAL;
-
- adev.device = device;
- strcpy(acpi_device_name(device), DRIVER_NAME);
- strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
- device->driver_data = &adev;
-
- lis3lv02d_acpi_read(device->handle, WHO_AM_I, &val);
- if ((val != LIS3LV02DL_ID) && (val != LIS302DL_ID)) {
+ /* if we did not get an IRQ from ACPI - we have nothing more to do */
+ if (!dev->irq) {
printk(KERN_ERR DRIVER_NAME
- ": Accelerometer chip not LIS3LV02D{L,Q}\n");
- }
-
- /* If possible use a "standard" axes order */
- if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
- printk(KERN_INFO DRIVER_NAME ": laptop model unknown, "
- "using default axes configuration\n");
- adev.ac = lis3lv02d_axis_normal;
+ ": No IRQ in ACPI. Disabling /dev/freefall\n");
+ goto out;
}
- return lis3lv02d_init_device(&adev);
-}
-
-static int lis3lv02d_remove(struct acpi_device *device, int type)
-{
- if (!device)
- return -EINVAL;
-
- lis3lv02d_joystick_disable();
- lis3lv02d_poweroff(device->handle);
-
- return lis3lv02d_remove_fs();
+ printk("lis3: registering device\n");
+ 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);
/* Sysfs stuff */
static ssize_t lis3lv02d_position_show(struct device *dev,
int val;
lis3lv02d_increase_use(&adev);
- lis3lv02d_acpi_read(adev.device->handle, CTRL_REG1, &ctrl);
+ adev.read(adev.device->handle, CTRL_REG1, &ctrl);
lis3lv02d_decrease_use(&adev);
val = (ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4;
return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]);
.attrs = lis3lv02d_attributes
};
+
static int lis3lv02d_add_fs(struct acpi_device *device)
{
adev.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
return sysfs_create_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
}
-static int lis3lv02d_remove_fs(void)
+int lis3lv02d_remove_fs(void)
{
sysfs_remove_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
platform_device_unregister(adev.pdev);
return 0;
}
-
-/* For the HP MDPS aka 3D Driveguard */
-static struct acpi_driver lis3lv02d_driver = {
- .name = DRIVER_NAME,
- .class = ACPI_MDPS_CLASS,
- .ids = lis3lv02d_device_ids,
- .ops = {
- .add = lis3lv02d_add,
- .remove = lis3lv02d_remove,
- .suspend = lis3lv02d_suspend,
- .resume = lis3lv02d_resume,
- }
-};
-
-static int __init lis3lv02d_init_module(void)
-{
- int ret;
-
- if (acpi_disabled)
- return -ENODEV;
-
- ret = acpi_bus_register_driver(&lis3lv02d_driver);
- if (ret < 0)
- return ret;
-
- printk(KERN_INFO DRIVER_NAME " driver loaded.\n");
-
- return 0;
-}
-
-static void __exit lis3lv02d_exit_module(void)
-{
- acpi_bus_unregister_driver(&lis3lv02d_driver);
-}
+EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
-MODULE_AUTHOR("Yan Burman and Eric Piel");
+MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
MODULE_LICENSE("GPL");
-module_init(lis3lv02d_init_module);
-module_exit(lis3lv02d_exit_module);
projects / linux-2.6-block.git / blobdiff