HP Mobile Data Protection System 3D ACPI driver. Similar to hdaps in functionality. This driver provides 4 kinds of functionality: 1) Creates a misc device /dev/acel that acts similar to /dev/rtc and unblocks the process reading from it when the device detects free-fall interrupt 2) Functions as an input class device to provide similar functionality to hdaps, in order to be able to use the laptop as a joystick 3) Provides an interface similar to hdaps, so that hdapsd could work with it 4) A misc character device similar in interface to /dev/rtc that reacts on free fall interrupts received from the device. For comments mail to: yan_952@hotmail.com Signed-off-by: Yan Burman diff -Nrubp linux-2.6.18.orig/drivers/hwmon/Kconfig linux-2.6.18.mdps/drivers/hwmon/Kconfig --- linux-2.6.18.orig/drivers/hwmon/Kconfig 2006-10-11 14:20:08.000000000 +0200 +++ linux-2.6.18.mdps/drivers/hwmon/Kconfig 2006-11-02 21:13:41.000000000 +0200 @@ -507,6 +507,26 @@ config SENSORS_HDAPS Say Y here if you have an applicable laptop and want to experience the awesome power of hdaps. +config SENSORS_MDPS + tristate "HP Mobile Data Protection System 3D (mdps)" + depends on ACPI && HWMON && INPUT && X86 + default n + help + This driver provides support for the HP Mobile Data Protection + System 3D (mdps), which is an accelerometer. Only HP nc6400 and nc6420 + is supported right now, but it may work on other models as well. The + accelerometer data is readable via /sys/devices/platform/mdps. + + This driver also provides an absolute input class device, allowing + the laptop to act as a pinball machine-esque joystick. + + Another feature of the driver is misc device called mdps that acts + similar to /dev/rtc and reacts on free-fall interrupts received from + the device. + + This driver can also be built as a module. If so, the module + will be called mdps. + config HWMON_DEBUG_CHIP bool "Hardware Monitoring Chip debugging messages" depends on HWMON diff -Nrubp linux-2.6.18.orig/drivers/hwmon/Makefile linux-2.6.18.mdps/drivers/hwmon/Makefile --- linux-2.6.18.orig/drivers/hwmon/Makefile 2006-10-11 14:20:08.000000000 +0200 +++ linux-2.6.18.mdps/drivers/hwmon/Makefile 2006-10-13 10:14:10.000000000 +0200 @@ -26,6 +26,7 @@ obj-$(CONFIG_SENSORS_FSCPOS) += fscpos.o obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o obj-$(CONFIG_SENSORS_GL520SM) += gl520sm.o obj-$(CONFIG_SENSORS_HDAPS) += hdaps.o +obj-$(CONFIG_SENSORS_MDPS) += mdps.o obj-$(CONFIG_SENSORS_IT87) += it87.o obj-$(CONFIG_SENSORS_LM63) += lm63.o obj-$(CONFIG_SENSORS_LM70) += lm70.o diff -Nrubp linux-2.6.18.orig/drivers/hwmon/mdps.c linux-2.6.18.mdps/drivers/hwmon/mdps.c --- linux-2.6.18.orig/drivers/hwmon/mdps.c 1970-01-01 02:00:00.000000000 +0200 +++ linux-2.6.18.mdps/drivers/hwmon/mdps.c 2006-11-02 21:11:13.000000000 +0200 @@ -0,0 +1,689 @@ +/* + * mdps.c - HP Mobile Data Protection System 3D ACPI driver + * + * Copyright (C) 2006 Yan Burman + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include + +#define VERSION "0.4" + +#define DRIVER_NAME "mdps" +#define ACPI_MDPS_CLASS "accelerometer" +#define ACPI_MDPS_ID "HPQ0004" + +/* The actual chip is STMicroelectronics LIS3LV02DL or LIS3LV02DQ */ + +#define MDPS_WHO_AM_I 0x0F /*r 00111010 */ +#define MDPS_OFFSET_X 0x16 /*rw */ +#define MDPS_OFFSET_Y 0x17 /*rw */ +#define MDPS_OFFSET_Z 0x18 /*rw */ +#define MDPS_GAIN_X 0x19 /*rw */ +#define MDPS_GAIN_Y 0x1A /*rw */ +#define MDPS_GAIN_Z 0x1B /*rw */ +#define MDPS_CTRL_REG1 0x20 /*rw 00000111 */ +#define MDPS_CTRL_REG2 0x21 /*rw 00000000 */ +#define MDPS_CTRL_REG3 0x22 /*rw 00001000 */ +#define MDPS_HP_FILTER RESET 0x23 /*r */ +#define MDPS_STATUS_REG 0x27 /*rw 00000000 */ +#define MDPS_OUTX_L 0x28 /*r */ +#define MDPS_OUTX_H 0x29 /*r */ +#define MDPS_OUTY_L 0x2A /*r */ +#define MDPS_OUTY_H 0x2B /*r */ +#define MDPS_OUTZ_L 0x2C /*r */ +#define MDPS_OUTZ_H 0x2D /*r */ +#define MDPS_FF_WU_CFG 0x30 /*rw 00000000 */ +#define MDPS_FF_WU_SRC 0x31 /*rw 00000000 */ +#define MDPS_FF_WU_ACK 0x32 /*r */ +#define MDPS_FF_WU_THS_L 0x34 /*rw 00000000 */ +#define MDPS_FF_WU_THS_H 0x35 /*rw 00000000 */ +#define MDPS_FF_WU_DURATION 0x36 /*rw 00000000 */ +#define MDPS_DD_CFG 0x38 /*rw 00000000 */ +#define MDPS_DD_SRC 0x39 /*rw 00000000 */ +#define MDPS_DD_ACK 0x3A /*r */ +#define MDPS_DD_THSI_L 0x3C /*rw 00000000 */ +#define MDPS_DD_THSI_H 0x3D /*rw 00000000 */ +#define MDPS_DD_THSE_L 0x3E /*rw 00000000 */ +#define MDPS_DD_THSE_H 0x3F /*rw 00000000 */ + +#define MDPS_ID 0x3A + +/* mouse device poll interval in milliseconds */ +#define MDPS_POLL_INTERVAL 30 + +static unsigned int mouse = 0; +module_param(mouse, bool, S_IRUGO); +MODULE_PARM_DESC(mouse, "Enable the input class device on module load"); + +static unsigned int power_off = 0; +module_param(power_off, bool, S_IRUGO); +MODULE_PARM_DESC(power_off, "Turn off device on module load"); + +struct acpi_mdps +{ + struct acpi_device* device; /* The ACPI device */ + u32 irq; /* IRQ number */ + struct input_dev* idev; /* input device */ + struct task_struct* kthread; /* kthread for input */ + int xcalib; /* calibrated null value for x */ + int ycalib; /* calibrated null value for y */ + int is_on; /* whether the device is on or off */ + struct platform_device* pdev; /* platform device */ + atomic_t count; /* how many times we got interrupts after the last read */ + struct completion complete; /* we wait on this in read */ + int reader_waiting; +}; + +static atomic_t mdps_available = ATOMIC_INIT(1); + +static struct acpi_mdps mdps; + +static int mdps_add(struct acpi_device *device); +static int mdps_remove(struct acpi_device *device, int type); +static int mdps_suspend(struct acpi_device * device, int state); +static int mdps_resume(struct acpi_device * device, int state); +static int mdps_remove_fs(void); +static int mdps_add_fs(struct acpi_device *device); +static void mdps_mouse_enable(void); +static void mdps_mouse_disable(void); + +static struct acpi_driver mdps_driver = +{ + .name = DRIVER_NAME, + .class = ACPI_MDPS_CLASS, + .ids = ACPI_MDPS_ID, + .ops = { + .add = mdps_add, + .remove = mdps_remove, +#ifdef CONFIG_PM + .suspend = mdps_suspend, + .resume = mdps_resume +#endif + } +}; + +static DEFINE_SPINLOCK(mdps_lock); + +/** Create a single value from 2 bytes received from the accelerometer + * @param hi the high byte + * @param lo the low byte + * @return the resulting value + */ +static inline s16 mdps_glue_bytes(unsigned long hi, unsigned long lo) +{ + /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */ + if (hi & 0x10) + hi |= 0xE0; + return (s16)(lo | ((hi << 8))); +} + +static acpi_status read_acpi_int_param(acpi_handle handle, acpi_string method, + int val, unsigned long* ret) +{ + union acpi_object arg0 = { ACPI_TYPE_INTEGER }; + struct acpi_object_list args = { 1, &arg0 }; + + arg0.integer.value = val; + + return acpi_evaluate_integer(handle, method, &args, ret); +} + +/** ACPI _STA method: get device status + * @param handle the handle of the device + * @param[out] ret result of the operation + * @return AE_OK on success + */ +static inline acpi_status mdps__STA(acpi_handle handle, unsigned long* ret) +{ + return acpi_evaluate_integer(handle, METHOD_NAME__STA, NULL, ret); +} + +/** ACPI ALRD method: read a register + * @param handle the handle of the device + * @param reg the register to read + * @param[out] ret result of the operation + * @return AE_OK on success + */ +static inline acpi_status mdps_ALRD(acpi_handle handle, int reg, + unsigned long* ret) +{ + return read_acpi_int_param(handle, "ALRD", reg, ret); +} + +/** ACPI _INI method: initialize the device. + * @param handle the handle of the device + * @return 0 on success + */ +static inline acpi_status mdps__INI(acpi_handle handle) +{ + return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL); +} + +/** ACPI ALWR method: write to a register + * @param handle the handle of the device + * @param reg the register to write to + * @param val the value to write + * @param[out] ret result of the operation + * @return AE_OK on success + */ +static acpi_status mdps_ALWR(acpi_handle handle, int reg, int val, + unsigned long* ret) +{ + union acpi_object in_obj[2]; + struct acpi_object_list args; + + args.count = 2; + args.pointer = 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 void mdps_get_xy(acpi_handle handle, int* x, int* y) +{ + unsigned long x_lo, x_hi, y_lo, y_hi; + + mdps_ALRD(mdps.device->handle, MDPS_OUTX_L, &x_lo); + mdps_ALRD(mdps.device->handle, MDPS_OUTX_H, &x_hi); + mdps_ALRD(mdps.device->handle, MDPS_OUTY_L, &y_lo); + mdps_ALRD(mdps.device->handle, MDPS_OUTY_H, &y_hi); + + *x = mdps_glue_bytes(x_hi, x_lo); + *y = mdps_glue_bytes(y_hi, y_lo); +} + +/** Kthread polling function + * @param data unused - here to conform to threadfn prototype + * @return 0 unused - here to conform to threadfn prototype + */ +static int mdps_mouse_kthread(void *data) +{ + int x, y; + + while (!kthread_should_stop()) { + mdps_get_xy(mdps.device->handle, &x, &y); + + /* need to invert the X axis for this to look natural */ + input_report_abs(mdps.idev, ABS_X, -(x - mdps.xcalib)); + input_report_abs(mdps.idev, ABS_Y, y - mdps.ycalib); + + input_sync(mdps.idev); + + msleep(MDPS_POLL_INTERVAL); + } + + return 0; +} + +static inline void mdps_poweroff(acpi_handle handle) +{ + unsigned long ret; + mdps.is_on = 0; + mdps_ALWR(handle, MDPS_CTRL_REG1, 0x00, &ret); +} + +static inline void mdps_poweron(acpi_handle handle) +{ + mdps.is_on = 1; + mdps__INI(handle); +} + +#ifdef CONFIG_PM +int mdps_suspend(struct acpi_device * device, int state) +{ + mdps_poweroff(mdps.device->handle); + mdps_mouse_disable(); + + return 0; +} +#endif + +int mdps_resume(struct acpi_device * device, int state) +{ + mdps_poweron(mdps.device->handle); + + if (mouse) + mdps_mouse_enable(); + + return 0; +} + +static irqreturn_t mdps_irq(int irq, void *dev_id) +{ + atomic_inc(&mdps.count); + + spin_lock(&mdps_lock); + /* If we have a reader waiting, signal him */ + if (mdps.reader_waiting) { + mdps.reader_waiting = 0; + complete(&mdps.complete); + } + spin_unlock(&mdps_lock); + + return IRQ_HANDLED; +} + +static int mdps_misc_release(struct inode *inode, struct file *file) +{ + atomic_inc(&mdps_available); /* release the device */ + return 0; +} + +static int mdps_misc_open(struct inode *inode, struct file *file) +{ + if (!atomic_dec_and_test(&mdps_available)) { + atomic_inc(&mdps_available); + return -EBUSY; /* already open */ + } + + atomic_set(&mdps.count, 0); + return 0; +} + +static ssize_t mdps_misc_read(struct file *file, char __user *buf, + size_t count, loff_t *pos) +{ + u32 tmp; + int ret; + unsigned long flags; + u32* user_buf = (u32*)buf; + + if (count != sizeof(u32)) + return -EINVAL; + + init_completion(&mdps.complete); + + spin_lock_irqsave(&mdps_lock, flags); + mdps.reader_waiting = 1; + spin_unlock_irqrestore(&mdps_lock, flags); + + ret = wait_for_completion_interruptible(&mdps.complete); + if (ret) + return ret; + tmp = atomic_read(&mdps.count); + atomic_set(&mdps.count, 0); + + if (put_user(tmp, user_buf)) + return -EFAULT; + + return count; +} + +static const struct file_operations mdps_misc_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .read = mdps_misc_read, + .open = mdps_misc_open, + .release = mdps_misc_release +}; + +static struct miscdevice mdps_misc_device = { + .minor = MISC_DYNAMIC_MINOR, + .name = "acel", + .fops = &mdps_misc_fops, +}; + +static acpi_status +mdps_get_resource(struct acpi_resource *resource, void *context) +{ + if (resource->type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ) { + struct acpi_resource_extended_irq* irq; + u32* device_irq = context; + + irq = &resource->data.extended_irq; + *device_irq = irq->interrupts[0]; + } + + return AE_OK; +} + +static void mdps_enum_resources(struct acpi_device * device) +{ + acpi_status status; + + status = acpi_walk_resources(device->handle, METHOD_NAME__CRS, + mdps_get_resource, &mdps.irq); + if (ACPI_FAILURE(status)) + printk(KERN_DEBUG "mdps: Error getting resources\n"); +} + +int mdps_add(struct acpi_device *device) +{ + unsigned long val; + int ret; + + if (!device) + return -EINVAL; + + mdps.device = device; + strcpy(acpi_device_name(device), DRIVER_NAME); + strcpy(acpi_device_class(device), ACPI_MDPS_CLASS); + acpi_driver_data(device) = &mdps; + + mdps_ALRD(device->handle, MDPS_WHO_AM_I, &val); + if (val != MDPS_ID) { + printk(KERN_INFO "mdps: Accelerometer chip not LIS3LV02D{L,Q}\n"); + return -ENODEV; + } + + mdps_enum_resources(device); + mdps_add_fs(device); + mdps_resume(device, 3); + + if (power_off) + mdps_poweroff(mdps.device->handle); + + if (mdps.irq) { + ret = request_irq(mdps.irq, mdps_irq, 0, "mdps", mdps_irq); + if (ret) { + printk(KERN_INFO "mdps: (IRQ%d) allocation failed\n", mdps.irq); + mdps.irq = 0; + } else { + ret = misc_register(&mdps_misc_device); + if (ret) { + free_irq(mdps.irq, mdps_irq); + mdps.irq = 0; + printk(KERN_ERR "mdps: misc_register failed\n"); + } + } + } + + return 0; +} + +int mdps_remove(struct acpi_device *device, int type) +{ + if (!device) + return -EINVAL; + + if (mdps.irq) { + misc_deregister(&mdps_misc_device); + free_irq(mdps.irq, mdps_irq); + mdps.irq = 0; + } + + if (mouse) + mdps_mouse_disable(); + + return mdps_remove_fs(); +} + +static void mdps_calibrate_mouse(void) +{ + int x, y; + mdps_get_xy(mdps.device->handle, &x, &y); + + mdps.xcalib = x; + mdps.ycalib = y; +} + +void mdps_mouse_enable(void) +{ + if (mdps.idev) + return; + + mdps.idev = input_allocate_device(); + if (!mdps.idev) + return; + + mdps_calibrate_mouse(); + + mdps.idev->name = "HP Mobile Data Protection System"; + mdps.idev->id.bustype = BUS_HOST; + mdps.idev->id.vendor = 0; + + set_bit(EV_ABS, mdps.idev->evbit); + set_bit(EV_KEY, mdps.idev->evbit); + + input_set_abs_params(mdps.idev, ABS_X, -2048, 2048, 3, 0); + input_set_abs_params(mdps.idev, ABS_Y, -2048, 2048, 3, 0); + + if (input_register_device(mdps.idev)) { + input_free_device(mdps.idev); + mdps.idev = NULL; + return; + } + + mdps.kthread = kthread_run(mdps_mouse_kthread, NULL, "kmdps"); + if (IS_ERR(mdps.kthread)) { + input_unregister_device(mdps.idev); + mdps.idev = NULL; + return; + } + + mouse = 1; +} + +void mdps_mouse_disable(void) +{ + if (!mdps.idev) + return; + + kthread_stop(mdps.kthread); + + input_unregister_device(mdps.idev); + mdps.idev = NULL; +} + +/* Sysfs stuff */ +static ssize_t mdps_position_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int x, y; + mdps_get_xy(mdps.device->handle, &x, &y); + return sprintf(buf, "(%d,%d)\n", x, y); +} + +static ssize_t mdps_position3d_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + unsigned long z_lo, z_hi; + int x, y, z; + + mdps_get_xy(mdps.device->handle, &x, &y); + + mdps_ALRD(mdps.device->handle, MDPS_OUTZ_L, &z_lo); + mdps_ALRD(mdps.device->handle, MDPS_OUTZ_H, &z_hi); + z = mdps_glue_bytes(z_hi, z_lo); + + return sprintf(buf, "(%d,%d,%d)\n", x, y, z); +} + +static ssize_t mdps_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%s\n", (mdps.is_on ? "on" : "off")); +} + +static ssize_t mdps_mouse_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%s\n", (mouse ? "enabled" : "disabled")); +} + +static ssize_t mdps_calibrate_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "(%d,%d)\n", mdps.xcalib, mdps.ycalib); +} + +static ssize_t mdps_calibrate_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + mdps_calibrate_mouse(); + return count; +} + +static ssize_t mdps_rate_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + unsigned long ctrl; + int rate = 0; + + mdps_ALRD(mdps.device->handle, MDPS_CTRL_REG1, &ctrl); + + switch (ctrl & 0x30) + { + case 0x00: + rate = 40; + break; + + case 0x10: + rate = 160; + break; + + case 0x20: + rate = 640; + break; + + case 0x30: + rate = 2560; + break; + } + + return sprintf(buf, "%d\n", rate); +} + +static ssize_t mdps_state_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int state; + if (sscanf(buf, "%d", &state) != 1 || (state != 1 && state != 0)) + return -EINVAL; + + mdps.is_on = state; + + if (mdps.is_on) + mdps_poweron(mdps.device->handle); + else + mdps_poweroff(mdps.device->handle); + + return count; +} + +static ssize_t mdps_mouse_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int tmp; + if (sscanf(buf, "%d", &tmp) != 1 || (tmp != 1 && tmp != 0)) + return -EINVAL; + + mouse = tmp; + + if (mouse) + mdps_mouse_enable(); + else + mdps_mouse_disable(); + + return count; +} + +static DEVICE_ATTR(position, S_IRUGO, mdps_position_show, NULL); +static DEVICE_ATTR(position3d, S_IRUGO, mdps_position3d_show, NULL); +static DEVICE_ATTR(calibrate, S_IRUGO|S_IWUSR, mdps_calibrate_show, mdps_calibrate_store); +static DEVICE_ATTR(rate, S_IRUGO, mdps_rate_show, NULL); +static DEVICE_ATTR(state, S_IRUGO|S_IWUSR, mdps_state_show, mdps_state_store); +static DEVICE_ATTR(mouse, S_IRUGO|S_IWUSR, mdps_mouse_show, mdps_mouse_store); + +static struct attribute *mdps_attributes[] = { + &dev_attr_position.attr, + &dev_attr_position3d.attr, + &dev_attr_calibrate.attr, + &dev_attr_rate.attr, + &dev_attr_state.attr, + &dev_attr_mouse.attr, + NULL +}; + +static struct attribute_group mdps_attribute_group = { + .attrs = mdps_attributes +}; + +int mdps_add_fs(struct acpi_device *device) +{ + mdps.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0); + if (IS_ERR(mdps.pdev)) + return PTR_ERR(mdps.pdev); + + return sysfs_create_group(&mdps.pdev->dev.kobj, &mdps_attribute_group); +} + +int mdps_remove_fs(void) +{ + sysfs_remove_group(&mdps.pdev->dev.kobj, &mdps_attribute_group); + platform_device_unregister(mdps.pdev); + return 0; +} + +static int __init mdps_init_module(void) +{ + int ret; + acpi_status status; + acpi_handle handle = 0; + + if (acpi_disabled) + return -ENODEV; + + /* device detection: see if our device is present */ + status = acpi_get_handle(NULL, "\\_SB.C002.ACEL", &handle); + if (ACPI_FAILURE(status)) { + printk(KERN_ERR "mdps: HP Mobile Data Protection System 3D device not found\n"); + return -ENODEV; + } + + ret = acpi_bus_register_driver(&mdps_driver); + if (ret < 0) + return ret; + + printk(KERN_INFO "mdps: (" VERSION ") loaded.\n"); + + return 0; +} + +static void __exit mdps_exit_module(void) +{ + acpi_bus_unregister_driver(&mdps_driver); +} + +MODULE_DESCRIPTION("HP three-axis digital accelerometer ACPI driver"); +MODULE_AUTHOR("Yan Burman (yan_952@hotmail.com)"); +MODULE_VERSION(VERSION); +MODULE_LICENSE("GPL"); + +module_init(mdps_init_module); +module_exit(mdps_exit_module);