asus-laptop: Pegatron Lucid accelerometer

Support the built-in accelerometer on the Lucid tablets as a standard
3-axis input device.

Signed-off-by: Andy Ross <andy.ross@windriver.com>
Signed-off-by: Corentin Chary <corentin.chary@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

2 files changed, 133 insertions, 5 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 4e5623e4fa0..0d4146ca011 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -69,10 +69,11 @@ config ASUS_LAPTOP
           This is a driver for Asus laptops, Lenovo SL and the Pegatron
           Lucid tablet. It may also support some MEDION, JVC or VICTOR
           laptops. It makes all the extra buttons generate standard
-          ACPI events and input events. It also adds support for video
-          output switching, LCD backlight control, Bluetooth and Wlan
-          control, and most importantly, allows you to blink those
-          fancy LEDs.
+          ACPI events and input events, and on the Lucid the built-in
+          accelerometer appears as an input device.  It also adds
+          support for video output switching, LCD backlight control,
+          Bluetooth and Wlan control, and most importantly, allows you
+          to blink those fancy LEDs.
 
           For more information see <http://acpi4asus.sf.net>.
 
diff --git a/drivers/platform/x86/asus-laptop.c b/drivers/platform/x86/asus-laptop.c
index 8327d06b6e8..613762d825f 100644
--- a/drivers/platform/x86/asus-laptop.c
+++ b/drivers/platform/x86/asus-laptop.c
@@ -193,6 +193,14 @@ MODULE_PARM_DESC(als_status, "Set the ALS status on boot "
 #define PEGA_READ_ALS_H 0x02
 #define PEGA_READ_ALS_L 0x03
 
+#define PEGA_ACCEL_NAME "pega_accel"
+#define PEGA_ACCEL_DESC "Pegatron Lucid Tablet Accelerometer"
+#define METHOD_XLRX "XLRX"
+#define METHOD_XLRY "XLRY"
+#define METHOD_XLRZ "XLRZ"
+#define PEGA_ACC_CLAMP 512 /* 1G accel is reported as ~256, so clamp to 2G */
+#define PEGA_ACC_RETRIES 3
+
 /*
  * Define a specific led structure to keep the main structure clean
  */
@@ -218,6 +226,7 @@ struct asus_laptop {
 
         struct input_dev *inputdev;
         struct key_entry *keymap;
+        struct input_polled_dev *pega_accel_poll;
 
         struct asus_led mled;
         struct asus_led tled;
@@ -230,6 +239,10 @@ struct asus_laptop {
         int wireless_status;
         bool have_rsts;
         bool is_pega_lucid;
+        bool pega_acc_live;
+        int pega_acc_x;
+        int pega_acc_y;
+        int pega_acc_z;
 
         struct rfkill *gps_rfkill;
 
@@ -358,6 +371,113 @@ static int asus_pega_lucid_set(struct asus_laptop *asus, int unit, bool enable)
         return write_acpi_int(asus->handle, method, unit);
 }
 
+static int pega_acc_axis(struct asus_laptop *asus, int curr, char *method)
+{
+        int i, delta;
+        unsigned long long val;
+        for (i = 0; i < PEGA_ACC_RETRIES; i++) {
+                acpi_evaluate_integer(asus->handle, method, NULL, &val);
+
+                /* The output is noisy.  From reading the ASL
+                 * dissassembly, timeout errors are returned with 1's
+                 * in the high word, and the lack of locking around
+                 * thei hi/lo byte reads means that a transition
+                 * between (for example) -1 and 0 could be read as
+                 * 0xff00 or 0x00ff. */
+                delta = abs(curr - (short)val);
+                if (delta < 128 && !(val & ~0xffff))
+                        break;
+        }
+        return clamp_val((short)val, -PEGA_ACC_CLAMP, PEGA_ACC_CLAMP);
+}
+
+static void pega_accel_poll(struct input_polled_dev *ipd)
+{
+        struct device *parent = ipd->input->dev.parent;
+        struct asus_laptop *asus = dev_get_drvdata(parent);
+
+        /* In some cases, the very first call to poll causes a
+         * recursive fault under the polldev worker.  This is
+         * apparently related to very early userspace access to the
+         * device, and perhaps a firmware bug. Fake the first report. */
+        if (!asus->pega_acc_live) {
+                asus->pega_acc_live = true;
+                input_report_abs(ipd->input, ABS_X, 0);
+                input_report_abs(ipd->input, ABS_Y, 0);
+                input_report_abs(ipd->input, ABS_Z, 0);
+                input_sync(ipd->input);
+                return;
+        }
+
+        asus->pega_acc_x = pega_acc_axis(asus, asus->pega_acc_x, METHOD_XLRX);
+        asus->pega_acc_y = pega_acc_axis(asus, asus->pega_acc_y, METHOD_XLRY);
+        asus->pega_acc_z = pega_acc_axis(asus, asus->pega_acc_z, METHOD_XLRZ);
+
+        /* 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). */
+        input_report_abs(ipd->input, ABS_X, -asus->pega_acc_x);
+        input_report_abs(ipd->input, ABS_Y, -asus->pega_acc_y);
+        input_report_abs(ipd->input, ABS_Z,  asus->pega_acc_z);
+        input_sync(ipd->input);
+}
+
+static void pega_accel_exit(struct asus_laptop *asus)
+{
+        if (asus->pega_accel_poll) {
+                input_unregister_polled_device(asus->pega_accel_poll);
+                input_free_polled_device(asus->pega_accel_poll);
+        }
+        asus->pega_accel_poll = NULL;
+}
+
+static int pega_accel_init(struct asus_laptop *asus)
+{
+        int err;
+        struct input_polled_dev *ipd;
+
+        if (!asus->is_pega_lucid)
+                return -ENODEV;
+
+        if (acpi_check_handle(asus->handle, METHOD_XLRX, NULL) ||
+            acpi_check_handle(asus->handle, METHOD_XLRY, NULL) ||
+            acpi_check_handle(asus->handle, METHOD_XLRZ, NULL))
+                return -ENODEV;
+
+        ipd = input_allocate_polled_device();
+        if (!ipd)
+                return -ENOMEM;
+
+        ipd->poll = pega_accel_poll;
+        ipd->poll_interval = 125;
+        ipd->poll_interval_min = 50;
+        ipd->poll_interval_max = 2000;
+
+        ipd->input->name = PEGA_ACCEL_DESC;
+        ipd->input->phys = PEGA_ACCEL_NAME "/input0";
+        ipd->input->dev.parent = &asus->platform_device->dev;
+        ipd->input->id.bustype = BUS_HOST;
+
+        set_bit(EV_ABS, ipd->input->evbit);
+        input_set_abs_params(ipd->input, ABS_X,
+                             -PEGA_ACC_CLAMP, PEGA_ACC_CLAMP, 0, 0);
+        input_set_abs_params(ipd->input, ABS_Y,
+                             -PEGA_ACC_CLAMP, PEGA_ACC_CLAMP, 0, 0);
+        input_set_abs_params(ipd->input, ABS_Z,
+                             -PEGA_ACC_CLAMP, PEGA_ACC_CLAMP, 0, 0);
+
+        err = input_register_polled_device(ipd);
+        if (err)
+                goto exit;
+
+        asus->pega_accel_poll = ipd;
+        return 0;
+
+exit:
+        input_free_polled_device(ipd);
+        return err;
+}
+
 /* Generic LED function */
 static int asus_led_set(struct asus_laptop *asus, const char *method,
                          int value)
@@ -1348,7 +1468,7 @@ static struct platform_driver platform_driver = {
         .driver = {
                 .name = ASUS_LAPTOP_FILE,
                 .owner = THIS_MODULE,
-        }
+        },
 };
 
 /*
@@ -1558,9 +1678,15 @@ static int __devinit asus_acpi_add(struct acpi_device *device)
         if (result)
                 goto fail_rfkill;
 
+        result = pega_accel_init(asus);
+        if (result && result != -ENODEV)
+                goto fail_pega_accel;
+
         asus_device_present = true;
         return 0;
 
+fail_pega_accel:
+        asus_rfkill_exit(asus);
 fail_rfkill:
         asus_led_exit(asus);
 fail_led:
@@ -1584,6 +1710,7 @@ static int asus_acpi_remove(struct acpi_device *device, int type)
         asus_rfkill_exit(asus);
         asus_led_exit(asus);
         asus_input_exit(asus);
+        pega_accel_exit(asus);
         asus_platform_exit(asus);
 
         kfree(asus->name);