1 files changed, 582 insertions, 0 deletions

diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
new file mode 100644
index 000000000000..752b5c44df9c
--- /dev/null
+++ b/drivers/hwmon/lis3lv02d.c
@@ -0,0 +1,582 @@
+/*
+ *  lis3lv02d.c - ST LIS3LV02DL accelerometer driver
+ *
+ *  Copyright (C) 2007-2008 Yan Burman
+ *  Copyright (C) 2008 Eric Piel
+ *
+ *  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
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/dmi.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/kthread.h>
+#include <linux/semaphore.h>
+#include <linux/delay.h>
+#include <linux/wait.h>
+#include <linux/poll.h>
+#include <linux/freezer.h>
+#include <linux/version.h>
+#include <linux/uaccess.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
+/*
+ * The sensor can also generate interrupts (DRDY) but it's pretty pointless
+ * because their are generated even if the data do not change. So it's better
+ * to keep the interrupt for the free-fall event. The values are updated at
+ * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
+ * some low processor, we poll the sensor only at 20Hz... enough for the
+ * 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 */
+};
+
+static struct acpi_lis3lv02d 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
+ * @hw_values: raw values returned by the hardware
+ *
+ * Returns the converted value.
+ */
+static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
+{
+        if (axis > 0)
+                return hw_values[axis - 1];
+        else
+                return -hw_values[-axis - 1];
+}
+
+/**
+ * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
+ * @handle: the handle to the device
+ * @x:      where to store the X axis value
+ * @y:      where to store the Y axis value
+ * @z:      where to store the Z axis value
+ *
+ * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
+ */
+static void lis3lv02d_get_xyz(acpi_handle handle, int *x, int *y, int *z)
+{
+        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);
+
+        *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)
+{
+        adev.is_on = 0;
+        /* disable X,Y,Z axis and power down */
+        lis3lv02d_acpi_write(handle, CTRL_REG1, 0x00);
+}
+
+static 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;
+}
+
+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
+
+
+/*
+ * 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 acpi_lis3lv02d *dev)
+{
+        mutex_lock(&dev->lock);
+        dev->usage++;
+        if (dev->usage == 1) {
+                if (!dev->is_on)
+                        lis3lv02d_poweron(dev->device->handle);
+        }
+        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 acpi_lis3lv02d *dev)
+{
+        mutex_lock(&dev->lock);
+        dev->usage--;
+        if (dev->usage == 0)
+                lis3lv02d_poweroff(dev->device->handle);
+        mutex_unlock(&dev->lock);
+}
+
+/**
+ * lis3lv02d_joystick_kthread - Kthread polling function
+ * @data: unused - here to conform to threadfn prototype
+ */
+static int lis3lv02d_joystick_kthread(void *data)
+{
+        int x, y, z;
+
+        while (!kthread_should_stop()) {
+                lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
+                input_report_abs(adev.idev, ABS_X, x - adev.xcalib);
+                input_report_abs(adev.idev, ABS_Y, y - adev.ycalib);
+                input_report_abs(adev.idev, ABS_Z, z - adev.zcalib);
+
+                input_sync(adev.idev);
+
+                try_to_freeze();
+                msleep_interruptible(MDPS_POLL_INTERVAL);
+        }
+
+        return 0;
+}
+
+static int lis3lv02d_joystick_open(struct input_dev *input)
+{
+        lis3lv02d_increase_use(&adev);
+        adev.kthread = kthread_run(lis3lv02d_joystick_kthread, NULL, "klis3lv02d");
+        if (IS_ERR(adev.kthread)) {
+                lis3lv02d_decrease_use(&adev);
+                return PTR_ERR(adev.kthread);
+        }
+
+        return 0;
+}
+
+static void lis3lv02d_joystick_close(struct input_dev *input)
+{
+        kthread_stop(adev.kthread);
+        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 err;
+
+        if (adev.idev)
+                return -EINVAL;
+
+        adev.idev = input_allocate_device();
+        if (!adev.idev)
+                return -ENOMEM;
+
+        lis3lv02d_calibrate_joystick();
+
+        adev.idev->name       = "ST LIS3LV02DL Accelerometer";
+        adev.idev->phys       = DRIVER_NAME "/input0";
+        adev.idev->id.bustype = BUS_HOST;
+        adev.idev->id.vendor  = 0;
+        adev.idev->dev.parent = &adev.pdev->dev;
+        adev.idev->open       = lis3lv02d_joystick_open;
+        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);
+
+        err = input_register_device(adev.idev);
+        if (err) {
+                input_free_device(adev.idev);
+                adev.idev = NULL;
+        }
+
+        return err;
+}
+
+static void lis3lv02d_joystick_disable(void)
+{
+        if (!adev.idev)
+                return;
+
+        input_unregister_device(adev.idev);
+        adev.idev = NULL;
+}
+
+
+/*
+ * Initialise the accelerometer and the various subsystems.
+ * Should be rather independant of the bus system.
+ */
+static int lis3lv02d_init_device(struct acpi_lis3lv02d *dev)
+{
+        mutex_init(&dev->lock);
+        lis3lv02d_add_fs(dev->device);
+        lis3lv02d_increase_use(dev);
+
+        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);
+
+        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)) {
+                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;
+        }
+
+        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();
+}
+
+
+/* Sysfs stuff */
+static ssize_t lis3lv02d_position_show(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+        int x, y, z;
+
+        lis3lv02d_increase_use(&adev);
+        lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
+        lis3lv02d_decrease_use(&adev);
+        return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
+}
+
+static ssize_t lis3lv02d_calibrate_show(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+        return sprintf(buf, "(%d,%d,%d)\n", adev.xcalib, adev.ycalib, adev.zcalib);
+}
+
+static ssize_t lis3lv02d_calibrate_store(struct device *dev,
+                                struct device_attribute *attr,
+                                const char *buf, size_t count)
+{
+        lis3lv02d_increase_use(&adev);
+        lis3lv02d_calibrate_joystick();
+        lis3lv02d_decrease_use(&adev);
+        return count;
+}
+
+/* conversion btw sampling rate and the register values */
+static int lis3lv02dl_df_val[4] = {40, 160, 640, 2560};
+static ssize_t lis3lv02d_rate_show(struct device *dev,
+                        struct device_attribute *attr, char *buf)
+{
+        u8 ctrl;
+        int val;
+
+        lis3lv02d_increase_use(&adev);
+        lis3lv02d_acpi_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]);
+}
+
+static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
+static DEVICE_ATTR(calibrate, S_IRUGO|S_IWUSR, lis3lv02d_calibrate_show,
+        lis3lv02d_calibrate_store);
+static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL);
+
+static struct attribute *lis3lv02d_attributes[] = {
+        &dev_attr_position.attr,
+        &dev_attr_calibrate.attr,
+        &dev_attr_rate.attr,
+        NULL
+};
+
+static struct attribute_group lis3lv02d_attribute_group = {
+        .attrs = lis3lv02d_attributes
+};
+
+static int lis3lv02d_add_fs(struct acpi_device *device)
+{
+        adev.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
+        if (IS_ERR(adev.pdev))
+                return PTR_ERR(adev.pdev);
+
+        return sysfs_create_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
+}
+
+static 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);
+}
+
+MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
+MODULE_AUTHOR("Yan Burman and Eric Piel");
+MODULE_LICENSE("GPL");
+
+module_init(lis3lv02d_init_module);
+module_exit(lis3lv02d_exit_module);