X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=drivers%2Fhwmon%2Flis3lv02d.c;h=8bb2158f0453c01f3c089ffaa88d8eea2927fd9d;hb=137bad32342a613586347341d1307c2b9812ef44;hp=c002144c76bc8762636f4fdb7649772d0b3a04cc;hpb=4d9c6a21befe6c73c35f2799c7e25a9eda82a95d;p=linux-2.6-block.git diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c index c002144c76bc..8bb2158f0453 100644 --- a/drivers/hwmon/lis3lv02d.c +++ b/drivers/hwmon/lis3lv02d.c @@ -3,6 +3,7 @@ * * 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 @@ -34,12 +35,12 @@ #include #include #include +#include #include #include #include "lis3lv02d.h" #define DRIVER_NAME "lis3lv02d" -#define ACPI_MDPS_CLASS "accelerometer" /* joystick device poll interval in milliseconds */ #define MDPS_POLL_INTERVAL 50 @@ -52,107 +53,14 @@ * 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 @@ -181,63 +89,27 @@ 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); + 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 @@ -268,6 +140,140 @@ static void lis3lv02d_decrease_use(struct acpi_lis3lv02d *dev) 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 @@ -309,13 +315,12 @@ static void lis3lv02d_joystick_close(struct input_dev *input) 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; @@ -337,9 +342,9 @@ static int lis3lv02d_joystick_enable(void) 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) { @@ -349,22 +354,24 @@ static int lis3lv02d_joystick_enable(void) 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); @@ -373,96 +380,23 @@ static int lis3lv02d_init_device(struct acpi_lis3lv02d *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); + 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, @@ -501,7 +435,7 @@ static ssize_t lis3lv02d_rate_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]); @@ -523,6 +457,7 @@ 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); @@ -532,50 +467,15 @@ static int lis3lv02d_add_fs(struct acpi_device *device) 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);