Add driver for the ACPI accelerometer interface on the Pegatron Lucid tablet.
Signed-off-by: Andy Ross <[email protected]> --- drivers/input/misc/Kconfig | 10 +++ drivers/input/misc/Makefile | 2 +- drivers/input/misc/pega-accel.c | 130 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 141 insertions(+), 1 deletions(-) create mode 100644 drivers/input/misc/pega-accel.c diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig index b99b8cb..e60af95 100644 --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -74,6 +74,16 @@ config INPUT_PCSPKR To compile this driver as a module, choose M here: the module will be called pcspkr. +config INPUT_PEGA_ACCEL + tristate "Support Pegatron Lucid accelerometer" + depends on ASUS_LAPTOP + help + Say Y here if you want support for the built-in ACPI + accelerometer device on Pegatron Lucid tablet devices. + + To compile this driver as a module, choose M here: the module + will be called pega_accel. + config INPUT_SPARCSPKR tristate "SPARC Speaker support" depends on PCI && SPARC64 diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile index 1fe1f6c..79aca4d 100644 --- a/drivers/input/misc/Makefile +++ b/drivers/input/misc/Makefile @@ -29,6 +29,7 @@ obj-$(CONFIG_INPUT_PCAP) += pcap_keys.o obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o obj-$(CONFIG_INPUT_PCF8574) += pcf8574_keypad.o obj-$(CONFIG_INPUT_PCSPKR) += pcspkr.o +obj-$(CONFIG_INPUT_PEGA_ACCEL) += pega-accel.o obj-$(CONFIG_INPUT_POWERMATE) += powermate.o obj-$(CONFIG_INPUT_PWM_BEEPER) += pwm-beeper.o obj-$(CONFIG_INPUT_RB532_BUTTON) += rb532_button.o @@ -42,4 +43,3 @@ obj-$(CONFIG_INPUT_WINBOND_CIR) += winbond-cir.o obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o obj-$(CONFIG_INPUT_WM831X_ON) += wm831x-on.o obj-$(CONFIG_INPUT_YEALINK) += yealink.o - diff --git a/drivers/input/misc/pega-accel.c b/drivers/input/misc/pega-accel.c new file mode 100644 index 0000000..7005b46 --- /dev/null +++ b/drivers/input/misc/pega-accel.c @@ -0,0 +1,130 @@ +/* + * Driver for accelerometer in Pegatron Lucid tablets + * + * Copyright (c) 2011 Wind River Systems + * + * Author: Andy Ross <[email protected]> + * + * 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/input-polldev.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <acpi/acpi_bus.h> + +#define DRIVER_NAME "pega_accel" +#define DRIVER_DESC "Pegatron Lucid Tablet Accelerometer" + +/* 1G accel is reported as ~256, so clamp to 2G */ +#define CLAMP 512 + +static struct input_polled_dev *ipdev; + +/* FIXME: this mechanism is *very* slow: ~50ms to read the three + * values. Pre-caching an acpi handle with acpi_get_handle has no + * effect, so the issue isn't in the parsing or tree walking... */ +static int acpi_s16(char *method) +{ + unsigned long long val = 0; + acpi_evaluate_integer(NULL, method, NULL, &val); + return (short)val; +} + +static void pega_accel_poll(struct input_polled_dev *ipdev) +{ + /* Note transform, convert to "right/up/out" in the native + * landscape orientation (i.e. the vector is the direction of + * "real up" in the device's cartiesian coordinates). FIXME: + * is there a relevant convention to adhere to? */ + int x = -acpi_s16("\\_SB.ATKD.XLRX"); + int y = -acpi_s16("\\_SB.ATKD.XLRY"); + int z = acpi_s16("\\_SB.ATKD.XLRZ"); + + x = clamp_val(x, -CLAMP, CLAMP); + y = clamp_val(y, -CLAMP, CLAMP); + z = clamp_val(z, -CLAMP, CLAMP); + + input_report_abs(ipdev->input, ABS_X, x); + input_report_abs(ipdev->input, ABS_Y, y); + input_report_abs(ipdev->input, ABS_Z, z); + input_sync(ipdev->input); +} + +static int __devinit platform_probe(struct platform_device *pd) +{ + int err; + + ipdev = input_allocate_polled_device(); + if (!ipdev) + return -ENOMEM; + + ipdev->poll = pega_accel_poll; + ipdev->poll_interval = 100; + ipdev->poll_interval_min = 10; + ipdev->poll_interval_max = 2000; + + ipdev->input->dev.parent = &pd->dev; + ipdev->input->id.bustype = BUS_HOST; + + ipdev->input->name = DRIVER_DESC; + ipdev->input->phys = DRIVER_NAME "/input0"; + + set_bit(EV_ABS, ipdev->input->evbit); + input_set_abs_params(ipdev->input, ABS_X, -CLAMP, CLAMP, 0, 0); + input_set_abs_params(ipdev->input, ABS_Y, -CLAMP, CLAMP, 0, 0); + input_set_abs_params(ipdev->input, ABS_Z, -CLAMP, CLAMP, 0, 0); + + err = input_register_polled_device(ipdev); + if (err) + input_free_polled_device(ipdev); + + return err; +} + +static int __devexit platform_remove(struct platform_device *pd) +{ + input_unregister_polled_device(ipdev); + input_free_polled_device(ipdev); + ipdev = NULL; + return 0; +} + +static struct platform_driver platform_driver = { + .driver = { + .owner = THIS_MODULE, + .name = DRIVER_NAME, + }, + .probe = platform_probe, + .remove = __devexit_p(platform_remove), +}; + +static int __init mod_init(void) +{ + return platform_driver_register(&platform_driver); +} + +static void __exit mod_exit(void) +{ + platform_driver_unregister(&platform_driver); +} + +module_init(mod_init); +module_exit(mod_exit); + +MODULE_AUTHOR("Andy Ross <[email protected]>"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_ALIAS("dmi:*:bvrLucid-CE-133:*"); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
