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/*
* 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>
#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 bool 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.type = BACKLIGHT_PLATFORM;
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 oaktrail_probe(struct platform_device *pdev)
{
return 0;
}
static int oaktrail_remove(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver oaktrail_driver = {
.driver = {
.name = DRIVER_NAME,
},
.probe = oaktrail_probe,
.remove = 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
},
{ }
};
MODULE_DEVICE_TABLE(dmi, oaktrail_dmi_table);
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
|