Add driver for the ACPI accelerometer interface on the Pegatron Lucid
tablet.
Signed-off-by: Andy Ross <andy.ross@xxxxxxxxxxxxx>
---
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 <andy.ross@xxxxxxxxxxxxx>
+ *
+ * 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 <andy.ross@xxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS("dmi:*:bvrLucid-CE-133:*");
--
1.7.1
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