diff options
Diffstat (limited to 'drivers/hwmon/lis3lv02d.c')
| -rw-r--r-- | drivers/hwmon/lis3lv02d.c | 487 |
1 files changed, 0 insertions, 487 deletions
diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c deleted file mode 100644 index cf5afb9a10a..00000000000 --- a/drivers/hwmon/lis3lv02d.c +++ /dev/null @@ -1,487 +0,0 @@ -/* - * lis3lv02d.c - ST LIS3LV02DL accelerometer driver - * - * 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 - * 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-polldev.h> -#include <linux/delay.h> -#include <linux/wait.h> -#include <linux/poll.h> -#include <linux/freezer.h> -#include <linux/uaccess.h> -#include <linux/miscdevice.h> -#include <asm/atomic.h> -#include "lis3lv02d.h" - -#define DRIVER_NAME "lis3lv02d" - -/* 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. - */ - -struct lis3lv02d lis3_dev = { - .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait), -}; - -EXPORT_SYMBOL_GPL(lis3_dev); - -static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg) -{ - s8 lo; - if (lis3->read(lis3, reg, &lo) < 0) - return 0; - - return lo; -} - -static s16 lis3lv02d_read_16(struct lis3lv02d *lis3, int reg) -{ - u8 lo, hi; - - lis3->read(lis3, reg - 1, &lo); - lis3->read(lis3, reg, &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 - * @lis3: pointer to the device struct - * @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(struct lis3lv02d *lis3, int *x, int *y, int *z) -{ - int position[3]; - - 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->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) -{ - /* 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) -{ - 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); - - -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(&lis3_dev.count); - - wake_up_interruptible(&lis3_dev.misc_wait); - kill_fasync(&lis3_dev.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, &lis3_dev.misc_opened)) - return -EBUSY; /* already open */ - - atomic_set(&lis3_dev.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(lis3_dev.irq, lis302dl_interrupt, IRQF_TRIGGER_RISING, - DRIVER_NAME, &lis3_dev); - - if (ret) { - clear_bit(0, &lis3_dev.misc_opened); - printk(KERN_ERR DRIVER_NAME ": IRQ%d allocation failed\n", lis3_dev.irq); - return -EBUSY; - } - return 0; -} - -static int lis3lv02d_misc_release(struct inode *inode, struct file *file) -{ - fasync_helper(-1, file, 0, &lis3_dev.async_queue); - free_irq(lis3_dev.irq, &lis3_dev); - clear_bit(0, &lis3_dev.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(&lis3_dev.misc_wait, &wait); - while (true) { - set_current_state(TASK_INTERRUPTIBLE); - data = atomic_xchg(&lis3_dev.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(&lis3_dev.misc_wait, &wait); - - return retval; -} - -static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait) -{ - poll_wait(file, &lis3_dev.misc_wait, wait); - if (atomic_read(&lis3_dev.count)) - return POLLIN | POLLRDNORM; - return 0; -} - -static int lis3lv02d_misc_fasync(int fd, struct file *file, int on) -{ - return fasync_helper(fd, file, on, &lis3_dev.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, -}; - -static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev) -{ - int x, y, z; - - lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z); - input_report_abs(pidev->input, ABS_X, x - lis3_dev.xcalib); - input_report_abs(pidev->input, ABS_Y, y - lis3_dev.ycalib); - input_report_abs(pidev->input, ABS_Z, z - lis3_dev.zcalib); -} - - -static inline void lis3lv02d_calibrate_joystick(void) -{ - lis3lv02d_get_xyz(&lis3_dev, - &lis3_dev.xcalib, &lis3_dev.ycalib, &lis3_dev.zcalib); -} - -int lis3lv02d_joystick_enable(void) -{ - struct input_dev *input_dev; - int err; - - if (lis3_dev.idev) - return -EINVAL; - - lis3_dev.idev = input_allocate_polled_device(); - if (!lis3_dev.idev) - return -ENOMEM; - - lis3_dev.idev->poll = lis3lv02d_joystick_poll; - lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL; - input_dev = lis3_dev.idev->input; - - lis3lv02d_calibrate_joystick(); - - input_dev->name = "ST LIS3LV02DL Accelerometer"; - input_dev->phys = DRIVER_NAME "/input0"; - input_dev->id.bustype = BUS_HOST; - input_dev->id.vendor = 0; - input_dev->dev.parent = &lis3_dev.pdev->dev; - - set_bit(EV_ABS, input_dev->evbit); - input_set_abs_params(input_dev, ABS_X, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3); - input_set_abs_params(input_dev, ABS_Y, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3); - input_set_abs_params(input_dev, ABS_Z, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3); - - err = input_register_polled_device(lis3_dev.idev); - if (err) { - input_free_polled_device(lis3_dev.idev); - lis3_dev.idev = NULL; - } - - return err; -} -EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable); - -void lis3lv02d_joystick_disable(void) -{ - if (!lis3_dev.idev) - return; - - if (lis3_dev.irq) - misc_deregister(&lis3lv02d_misc_device); - input_unregister_polled_device(lis3_dev.idev); - lis3_dev.idev = NULL; -} -EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable); - -/* Sysfs stuff */ -static ssize_t lis3lv02d_position_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - int x, y, z; - - lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z); - 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", lis3_dev.xcalib, lis3_dev.ycalib, lis3_dev.zcalib); -} - -static ssize_t lis3lv02d_calibrate_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - lis3lv02d_calibrate_joystick(); - 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; - - lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl); - 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 lis3lv02d *lis3) -{ - 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->pdev->dev.kobj, &lis3lv02d_attribute_group); -} - -int lis3lv02d_remove_fs(struct lis3lv02d *lis3) -{ - sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group); - platform_device_unregister(lis3->pdev); - return 0; -} -EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs); - -/* - * Initialise the accelerometer and the various subsystems. - * Should be rather independant of the bus system. - */ -int lis3lv02d_init_device(struct lis3lv02d *dev) -{ - dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I); - - switch (dev->whoami) { - case LIS_DOUBLE_ID: - printk(KERN_INFO DRIVER_NAME ": 2-byte sensor found\n"); - dev->read_data = lis3lv02d_read_16; - dev->mdps_max_val = 2048; - break; - case LIS_SINGLE_ID: - printk(KERN_INFO DRIVER_NAME ": 1-byte sensor found\n"); - dev->read_data = lis3lv02d_read_8; - dev->mdps_max_val = 128; - break; - default: - printk(KERN_ERR DRIVER_NAME - ": unknown sensor type 0x%X\n", dev->whoami); - return -EINVAL; - } - - lis3lv02d_add_fs(dev); - lis3lv02d_poweron(dev); - - if (lis3lv02d_joystick_enable()) - printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n"); - - /* passing in platform specific data is purely optional and only - * used by the SPI transport layer at the moment */ - if (dev->pdata) { - struct lis3lv02d_platform_data *p = dev->pdata; - - if (p->click_flags && (dev->whoami == LIS_SINGLE_ID)) { - dev->write(dev, CLICK_CFG, p->click_flags); - dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit); - dev->write(dev, CLICK_LATENCY, p->click_latency); - dev->write(dev, CLICK_WINDOW, p->click_window); - dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf); - dev->write(dev, CLICK_THSY_X, - (p->click_thresh_x & 0xf) | - (p->click_thresh_y << 4)); - } - - if (p->wakeup_flags && (dev->whoami == LIS_SINGLE_ID)) { - dev->write(dev, FF_WU_CFG_1, p->wakeup_flags); - dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f); - /* default to 2.5ms for now */ - dev->write(dev, FF_WU_DURATION_1, 1); - /* enable high pass filter for both free-fall units */ - dev->write(dev, CTRL_REG2, HP_FF_WU1 | HP_FF_WU2); - } - - if (p->irq_cfg) - dev->write(dev, CTRL_REG3, p->irq_cfg); - } - - /* bail if we did not get an IRQ from the bus layer */ - if (!dev->irq) { - printk(KERN_ERR DRIVER_NAME - ": No IRQ. Disabling /dev/freefall\n"); - goto out; - } - - if (misc_register(&lis3lv02d_misc_device)) - printk(KERN_ERR DRIVER_NAME ": misc_register failed\n"); -out: - return 0; -} -EXPORT_SYMBOL_GPL(lis3lv02d_init_device); - -MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver"); -MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek"); -MODULE_LICENSE("GPL"); - |