--- /dev/null
+/*
+ * intel_oaktrail.c - Intel OakTrail Platform support.
+ *
+ * Copyright (C) 2010-2011 Intel Corporation
+ * Author: Yin Kangkai (kangkai.yin@intel.com)
+ *
+ * based on Compal driver, Copyright (C) 2008 Cezary Jackiewicz
+ * <cezary.jackiewicz (at) gmail.com>, based on MSI driver
+ * Copyright (C) 2006 Lennart Poettering <mzxreary (at) 0pointer (dot) de>
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * This driver does below things:
+ * 1. registers itself in the Linux backlight control in
+ * /sys/class/backlight/intel_oaktrail/
+ *
+ * 2. registers in the rfkill subsystem here: /sys/class/rfkill/rfkillX/
+ * for these components: wifi, bluetooth, wwan (3g), gps
+ *
+ * This driver might work on other products based on Oaktrail. If you
+ * want to try it you can pass force=1 as argument to the module which
+ * will force it to load even when the DMI data doesn't identify the
+ * product as compatible.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/fb.h>
+#include <linux/mutex.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/backlight.h>
+#include <linux/platform_device.h>
+#include <linux/dmi.h>
+#include <linux/rfkill.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+
+#define DRIVER_NAME "intel_oaktrail"
+#define DRIVER_VERSION "0.4ac1"
+
+/*
+ * This is the devices status address in EC space, and the control bits
+ * definition:
+ *
+ * (1 << 0): Camera enable/disable, RW.
+ * (1 << 1): Bluetooth enable/disable, RW.
+ * (1 << 2): GPS enable/disable, RW.
+ * (1 << 3): WiFi enable/disable, RW.
+ * (1 << 4): WWAN (3G) enable/disalbe, RW.
+ * (1 << 5): Touchscreen enable/disable, Read Only.
+ */
+#define OT_EC_DEVICE_STATE_ADDRESS 0xD6
+
+#define OT_EC_CAMERA_MASK (1 << 0)
+#define OT_EC_BT_MASK (1 << 1)
+#define OT_EC_GPS_MASK (1 << 2)
+#define OT_EC_WIFI_MASK (1 << 3)
+#define OT_EC_WWAN_MASK (1 << 4)
+#define OT_EC_TS_MASK (1 << 5)
+
+/*
+ * This is the address in EC space and commands used to control LCD backlight:
+ *
+ * Two steps needed to change the LCD backlight:
+ * 1. write the backlight percentage into OT_EC_BL_BRIGHTNESS_ADDRESS;
+ * 2. write OT_EC_BL_CONTROL_ON_DATA into OT_EC_BL_CONTROL_ADDRESS.
+ *
+ * To read the LCD back light, just read out the value from
+ * OT_EC_BL_BRIGHTNESS_ADDRESS.
+ *
+ * LCD backlight brightness range: 0 - 100 (OT_EC_BL_BRIGHTNESS_MAX)
+ */
+#define OT_EC_BL_BRIGHTNESS_ADDRESS 0x44
+#define OT_EC_BL_BRIGHTNESS_MAX 100
+#define OT_EC_BL_CONTROL_ADDRESS 0x3A
+#define OT_EC_BL_CONTROL_ON_DATA 0x1A
+
+
+static int force;
+module_param(force, bool, 0);
+MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
+
+static struct platform_device *oaktrail_device;
+static struct backlight_device *oaktrail_bl_device;
+static struct rfkill *bt_rfkill;
+static struct rfkill *gps_rfkill;
+static struct rfkill *wifi_rfkill;
+static struct rfkill *wwan_rfkill;
+
+
+/* rfkill */
+static int oaktrail_rfkill_set(void *data, bool blocked)
+{
+ u8 value;
+ u8 result;
+ unsigned long radio = (unsigned long) data;
+
+ ec_read(OT_EC_DEVICE_STATE_ADDRESS, &result);
+
+ if (!blocked)
+ value = (u8) (result | radio);
+ else
+ value = (u8) (result & ~radio);
+
+ ec_write(OT_EC_DEVICE_STATE_ADDRESS, value);
+
+ return 0;
+}
+
+static const struct rfkill_ops oaktrail_rfkill_ops = {
+ .set_block = oaktrail_rfkill_set,
+};
+
+static struct rfkill *oaktrail_rfkill_new(char *name, enum rfkill_type type,
+ unsigned long mask)
+{
+ struct rfkill *rfkill_dev;
+ u8 value;
+ int err;
+
+ rfkill_dev = rfkill_alloc(name, &oaktrail_device->dev, type,
+ &oaktrail_rfkill_ops, (void *)mask);
+ if (!rfkill_dev)
+ return ERR_PTR(-ENOMEM);
+
+ ec_read(OT_EC_DEVICE_STATE_ADDRESS, &value);
+ rfkill_init_sw_state(rfkill_dev, (value & mask) != 1);
+
+ err = rfkill_register(rfkill_dev);
+ if (err) {
+ rfkill_destroy(rfkill_dev);
+ return ERR_PTR(err);
+ }
+
+ return rfkill_dev;
+}
+
+static inline void __oaktrail_rfkill_cleanup(struct rfkill *rf)
+{
+ if (rf) {
+ rfkill_unregister(rf);
+ rfkill_destroy(rf);
+ }
+}
+
+static void oaktrail_rfkill_cleanup(void)
+{
+ __oaktrail_rfkill_cleanup(wifi_rfkill);
+ __oaktrail_rfkill_cleanup(bt_rfkill);
+ __oaktrail_rfkill_cleanup(gps_rfkill);
+ __oaktrail_rfkill_cleanup(wwan_rfkill);
+}
+
+static int oaktrail_rfkill_init(void)
+{
+ int ret;
+
+ wifi_rfkill = oaktrail_rfkill_new("oaktrail-wifi",
+ RFKILL_TYPE_WLAN,
+ OT_EC_WIFI_MASK);
+ if (IS_ERR(wifi_rfkill)) {
+ ret = PTR_ERR(wifi_rfkill);
+ wifi_rfkill = NULL;
+ goto cleanup;
+ }
+
+ bt_rfkill = oaktrail_rfkill_new("oaktrail-bluetooth",
+ RFKILL_TYPE_BLUETOOTH,
+ OT_EC_BT_MASK);
+ if (IS_ERR(bt_rfkill)) {
+ ret = PTR_ERR(bt_rfkill);
+ bt_rfkill = NULL;
+ goto cleanup;
+ }
+
+ gps_rfkill = oaktrail_rfkill_new("oaktrail-gps",
+ RFKILL_TYPE_GPS,
+ OT_EC_GPS_MASK);
+ if (IS_ERR(gps_rfkill)) {
+ ret = PTR_ERR(gps_rfkill);
+ gps_rfkill = NULL;
+ goto cleanup;
+ }
+
+ wwan_rfkill = oaktrail_rfkill_new("oaktrail-wwan",
+ RFKILL_TYPE_WWAN,
+ OT_EC_WWAN_MASK);
+ if (IS_ERR(wwan_rfkill)) {
+ ret = PTR_ERR(wwan_rfkill);
+ wwan_rfkill = NULL;
+ goto cleanup;
+ }
+
+ return 0;
+
+cleanup:
+ oaktrail_rfkill_cleanup();
+ return ret;
+}
+
+
+/* backlight */
+static int get_backlight_brightness(struct backlight_device *b)
+{
+ u8 value;
+ ec_read(OT_EC_BL_BRIGHTNESS_ADDRESS, &value);
+
+ return value;
+}
+
+static int set_backlight_brightness(struct backlight_device *b)
+{
+ u8 percent = (u8) b->props.brightness;
+ if (percent < 0 || percent > OT_EC_BL_BRIGHTNESS_MAX)
+ return -EINVAL;
+
+ ec_write(OT_EC_BL_BRIGHTNESS_ADDRESS, percent);
+ ec_write(OT_EC_BL_CONTROL_ADDRESS, OT_EC_BL_CONTROL_ON_DATA);
+
+ return 0;
+}
+
+static const struct backlight_ops oaktrail_bl_ops = {
+ .get_brightness = get_backlight_brightness,
+ .update_status = set_backlight_brightness,
+};
+
+static int oaktrail_backlight_init(void)
+{
+ struct backlight_device *bd;
+ struct backlight_properties props;
+
+ memset(&props, 0, sizeof(struct backlight_properties));
+ props.max_brightness = OT_EC_BL_BRIGHTNESS_MAX;
+ bd = backlight_device_register(DRIVER_NAME,
+ &oaktrail_device->dev, NULL,
+ &oaktrail_bl_ops,
+ &props);
+
+ if (IS_ERR(bd)) {
+ oaktrail_bl_device = NULL;
+ pr_warning("Unable to register backlight device\n");
+ return PTR_ERR(bd);
+ }
+
+ oaktrail_bl_device = bd;
+
+ bd->props.brightness = get_backlight_brightness(bd);
+ bd->props.power = FB_BLANK_UNBLANK;
+ backlight_update_status(bd);
+
+ return 0;
+}
+
+static void oaktrail_backlight_exit(void)
+{
+ if (oaktrail_bl_device)
+ backlight_device_unregister(oaktrail_bl_device);
+}
+
+static int __devinit oaktrail_probe(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static int __devexit oaktrail_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static struct platform_driver oaktrail_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = oaktrail_probe,
+ .remove = __devexit_p(oaktrail_remove)
+};
+
+static int dmi_check_cb(const struct dmi_system_id *id)
+{
+ pr_info("Identified model '%s'\n", id->ident);
+ return 0;
+}
+
+static struct dmi_system_id __initdata oaktrail_dmi_table[] = {
+ {
+ .ident = "OakTrail platform",
+ .matches = {
+ DMI_MATCH(DMI_PRODUCT_NAME, "OakTrail platform"),
+ },
+ .callback = dmi_check_cb
+ },
+ { }
+};
+
+static int __init oaktrail_init(void)
+{
+ int ret;
+
+ if (acpi_disabled) {
+ pr_err("ACPI needs to be enabled for this driver to work!\n");
+ return -ENODEV;
+ }
+
+ if (!force && !dmi_check_system(oaktrail_dmi_table)) {
+ pr_err("Platform not recognized (You could try the module's force-parameter)");
+ return -ENODEV;
+ }
+
+ ret = platform_driver_register(&oaktrail_driver);
+ if (ret) {
+ pr_warning("Unable to register platform driver\n");
+ goto err_driver_reg;
+ }
+
+ oaktrail_device = platform_device_alloc(DRIVER_NAME, -1);
+ if (!oaktrail_device) {
+ pr_warning("Unable to allocate platform device\n");
+ ret = -ENOMEM;
+ goto err_device_alloc;
+ }
+
+ ret = platform_device_add(oaktrail_device);
+ if (ret) {
+ pr_warning("Unable to add platform device\n");
+ goto err_device_add;
+ }
+
+ if (!acpi_video_backlight_support()) {
+ ret = oaktrail_backlight_init();
+ if (ret)
+ goto err_backlight;
+
+ } else
+ pr_info("Backlight controlled by ACPI video driver\n");
+
+ ret = oaktrail_rfkill_init();
+ if (ret) {
+ pr_warning("Setup rfkill failed\n");
+ goto err_rfkill;
+ }
+
+ pr_info("Driver "DRIVER_VERSION" successfully loaded\n");
+ return 0;
+
+err_rfkill:
+ oaktrail_backlight_exit();
+err_backlight:
+ platform_device_del(oaktrail_device);
+err_device_add:
+ platform_device_put(oaktrail_device);
+err_device_alloc:
+ platform_driver_unregister(&oaktrail_driver);
+err_driver_reg:
+
+ return ret;
+}
+
+static void __exit oaktrail_cleanup(void)
+{
+ oaktrail_backlight_exit();
+ oaktrail_rfkill_cleanup();
+ platform_device_unregister(oaktrail_device);
+ platform_driver_unregister(&oaktrail_driver);
+
+ pr_info("Driver unloaded\n");
+}
+
+module_init(oaktrail_init);
+module_exit(oaktrail_cleanup);
+
+MODULE_AUTHOR("Yin Kangkai (kangkai.yin@intel.com)");
+MODULE_DESCRIPTION("Intel Oaktrail Platform ACPI Extras");
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("dmi:*:svnIntelCorporation:pnOakTrailplatform:*");
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