372 lines
8.6 KiB
C
372 lines
8.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Intel OakTrail Platform support
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*
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* Copyright (C) 2010-2011 Intel Corporation
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* Author: Yin Kangkai (kangkai.yin@intel.com)
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*
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* based on Compal driver, Copyright (C) 2008 Cezary Jackiewicz
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* <cezary.jackiewicz (at) gmail.com>, based on MSI driver
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* Copyright (C) 2006 Lennart Poettering <mzxreary (at) 0pointer (dot) de>
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*
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* This driver does below things:
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* 1. registers itself in the Linux backlight control in
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* /sys/class/backlight/intel_oaktrail/
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*
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* 2. registers in the rfkill subsystem here: /sys/class/rfkill/rfkillX/
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* for these components: wifi, bluetooth, wwan (3g), gps
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*
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* This driver might work on other products based on Oaktrail. If you
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* want to try it you can pass force=1 as argument to the module which
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* will force it to load even when the DMI data doesn't identify the
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* product as compatible.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/acpi.h>
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#include <linux/backlight.h>
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#include <linux/dmi.h>
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#include <linux/err.h>
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#include <linux/fb.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/rfkill.h>
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#include <acpi/video.h>
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#define DRIVER_NAME "intel_oaktrail"
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#define DRIVER_VERSION "0.4ac1"
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/*
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* This is the devices status address in EC space, and the control bits
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* definition:
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*
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* (1 << 0): Camera enable/disable, RW.
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* (1 << 1): Bluetooth enable/disable, RW.
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* (1 << 2): GPS enable/disable, RW.
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* (1 << 3): WiFi enable/disable, RW.
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* (1 << 4): WWAN (3G) enable/disable, RW.
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* (1 << 5): Touchscreen enable/disable, Read Only.
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*/
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#define OT_EC_DEVICE_STATE_ADDRESS 0xD6
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#define OT_EC_CAMERA_MASK (1 << 0)
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#define OT_EC_BT_MASK (1 << 1)
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#define OT_EC_GPS_MASK (1 << 2)
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#define OT_EC_WIFI_MASK (1 << 3)
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#define OT_EC_WWAN_MASK (1 << 4)
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#define OT_EC_TS_MASK (1 << 5)
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/*
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* This is the address in EC space and commands used to control LCD backlight:
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*
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* Two steps needed to change the LCD backlight:
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* 1. write the backlight percentage into OT_EC_BL_BRIGHTNESS_ADDRESS;
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* 2. write OT_EC_BL_CONTROL_ON_DATA into OT_EC_BL_CONTROL_ADDRESS.
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*
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* To read the LCD back light, just read out the value from
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* OT_EC_BL_BRIGHTNESS_ADDRESS.
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*
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* LCD backlight brightness range: 0 - 100 (OT_EC_BL_BRIGHTNESS_MAX)
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*/
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#define OT_EC_BL_BRIGHTNESS_ADDRESS 0x44
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#define OT_EC_BL_BRIGHTNESS_MAX 100
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#define OT_EC_BL_CONTROL_ADDRESS 0x3A
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#define OT_EC_BL_CONTROL_ON_DATA 0x1A
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static bool force;
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module_param(force, bool, 0);
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MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
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static struct platform_device *oaktrail_device;
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static struct backlight_device *oaktrail_bl_device;
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static struct rfkill *bt_rfkill;
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static struct rfkill *gps_rfkill;
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static struct rfkill *wifi_rfkill;
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static struct rfkill *wwan_rfkill;
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/* rfkill */
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static int oaktrail_rfkill_set(void *data, bool blocked)
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{
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u8 value;
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u8 result;
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unsigned long radio = (unsigned long) data;
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ec_read(OT_EC_DEVICE_STATE_ADDRESS, &result);
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if (!blocked)
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value = (u8) (result | radio);
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else
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value = (u8) (result & ~radio);
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ec_write(OT_EC_DEVICE_STATE_ADDRESS, value);
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return 0;
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}
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static const struct rfkill_ops oaktrail_rfkill_ops = {
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.set_block = oaktrail_rfkill_set,
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};
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static struct rfkill *oaktrail_rfkill_new(char *name, enum rfkill_type type,
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unsigned long mask)
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{
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struct rfkill *rfkill_dev;
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u8 value;
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int err;
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rfkill_dev = rfkill_alloc(name, &oaktrail_device->dev, type,
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&oaktrail_rfkill_ops, (void *)mask);
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if (!rfkill_dev)
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return ERR_PTR(-ENOMEM);
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ec_read(OT_EC_DEVICE_STATE_ADDRESS, &value);
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rfkill_init_sw_state(rfkill_dev, (value & mask) != 1);
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err = rfkill_register(rfkill_dev);
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if (err) {
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rfkill_destroy(rfkill_dev);
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return ERR_PTR(err);
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}
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return rfkill_dev;
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}
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static inline void __oaktrail_rfkill_cleanup(struct rfkill *rf)
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{
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if (rf) {
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rfkill_unregister(rf);
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rfkill_destroy(rf);
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}
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}
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static void oaktrail_rfkill_cleanup(void)
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{
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__oaktrail_rfkill_cleanup(wifi_rfkill);
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__oaktrail_rfkill_cleanup(bt_rfkill);
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__oaktrail_rfkill_cleanup(gps_rfkill);
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__oaktrail_rfkill_cleanup(wwan_rfkill);
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}
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static int oaktrail_rfkill_init(void)
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{
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int ret;
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wifi_rfkill = oaktrail_rfkill_new("oaktrail-wifi",
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RFKILL_TYPE_WLAN,
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OT_EC_WIFI_MASK);
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if (IS_ERR(wifi_rfkill)) {
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ret = PTR_ERR(wifi_rfkill);
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wifi_rfkill = NULL;
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goto cleanup;
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}
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bt_rfkill = oaktrail_rfkill_new("oaktrail-bluetooth",
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RFKILL_TYPE_BLUETOOTH,
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OT_EC_BT_MASK);
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if (IS_ERR(bt_rfkill)) {
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ret = PTR_ERR(bt_rfkill);
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bt_rfkill = NULL;
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goto cleanup;
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}
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gps_rfkill = oaktrail_rfkill_new("oaktrail-gps",
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RFKILL_TYPE_GPS,
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OT_EC_GPS_MASK);
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if (IS_ERR(gps_rfkill)) {
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ret = PTR_ERR(gps_rfkill);
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gps_rfkill = NULL;
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goto cleanup;
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}
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wwan_rfkill = oaktrail_rfkill_new("oaktrail-wwan",
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RFKILL_TYPE_WWAN,
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OT_EC_WWAN_MASK);
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if (IS_ERR(wwan_rfkill)) {
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ret = PTR_ERR(wwan_rfkill);
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wwan_rfkill = NULL;
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goto cleanup;
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}
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return 0;
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cleanup:
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oaktrail_rfkill_cleanup();
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return ret;
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}
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/* backlight */
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static int get_backlight_brightness(struct backlight_device *b)
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{
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u8 value;
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ec_read(OT_EC_BL_BRIGHTNESS_ADDRESS, &value);
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return value;
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}
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static int set_backlight_brightness(struct backlight_device *b)
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{
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u8 percent = (u8) b->props.brightness;
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if (percent < 0 || percent > OT_EC_BL_BRIGHTNESS_MAX)
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return -EINVAL;
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ec_write(OT_EC_BL_BRIGHTNESS_ADDRESS, percent);
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ec_write(OT_EC_BL_CONTROL_ADDRESS, OT_EC_BL_CONTROL_ON_DATA);
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return 0;
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}
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static const struct backlight_ops oaktrail_bl_ops = {
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.get_brightness = get_backlight_brightness,
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.update_status = set_backlight_brightness,
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};
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static int oaktrail_backlight_init(void)
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{
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struct backlight_device *bd;
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struct backlight_properties props;
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memset(&props, 0, sizeof(struct backlight_properties));
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props.type = BACKLIGHT_PLATFORM;
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props.max_brightness = OT_EC_BL_BRIGHTNESS_MAX;
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bd = backlight_device_register(DRIVER_NAME,
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&oaktrail_device->dev, NULL,
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&oaktrail_bl_ops,
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&props);
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if (IS_ERR(bd)) {
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oaktrail_bl_device = NULL;
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pr_warn("Unable to register backlight device\n");
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return PTR_ERR(bd);
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}
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oaktrail_bl_device = bd;
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bd->props.brightness = get_backlight_brightness(bd);
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bd->props.power = FB_BLANK_UNBLANK;
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backlight_update_status(bd);
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return 0;
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}
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static void oaktrail_backlight_exit(void)
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{
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backlight_device_unregister(oaktrail_bl_device);
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}
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static int oaktrail_probe(struct platform_device *pdev)
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{
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return 0;
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}
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static struct platform_driver oaktrail_driver = {
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.driver = {
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.name = DRIVER_NAME,
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},
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.probe = oaktrail_probe,
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};
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static int dmi_check_cb(const struct dmi_system_id *id)
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{
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pr_info("Identified model '%s'\n", id->ident);
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return 0;
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}
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static const struct dmi_system_id oaktrail_dmi_table[] __initconst = {
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{
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.ident = "OakTrail platform",
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.matches = {
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DMI_MATCH(DMI_PRODUCT_NAME, "OakTrail platform"),
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},
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.callback = dmi_check_cb
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},
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{ }
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};
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MODULE_DEVICE_TABLE(dmi, oaktrail_dmi_table);
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static int __init oaktrail_init(void)
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{
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int ret;
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if (acpi_disabled) {
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pr_err("ACPI needs to be enabled for this driver to work!\n");
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return -ENODEV;
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}
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if (!force && !dmi_check_system(oaktrail_dmi_table)) {
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pr_err("Platform not recognized (You could try the module's force-parameter)");
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return -ENODEV;
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}
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ret = platform_driver_register(&oaktrail_driver);
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if (ret) {
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pr_warn("Unable to register platform driver\n");
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goto err_driver_reg;
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}
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oaktrail_device = platform_device_alloc(DRIVER_NAME, PLATFORM_DEVID_NONE);
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if (!oaktrail_device) {
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pr_warn("Unable to allocate platform device\n");
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ret = -ENOMEM;
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goto err_device_alloc;
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}
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ret = platform_device_add(oaktrail_device);
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if (ret) {
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pr_warn("Unable to add platform device\n");
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goto err_device_add;
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}
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if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
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ret = oaktrail_backlight_init();
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if (ret)
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goto err_backlight;
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}
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ret = oaktrail_rfkill_init();
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if (ret) {
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pr_warn("Setup rfkill failed\n");
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goto err_rfkill;
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}
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pr_info("Driver "DRIVER_VERSION" successfully loaded\n");
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return 0;
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err_rfkill:
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oaktrail_backlight_exit();
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err_backlight:
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platform_device_del(oaktrail_device);
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err_device_add:
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platform_device_put(oaktrail_device);
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err_device_alloc:
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platform_driver_unregister(&oaktrail_driver);
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err_driver_reg:
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return ret;
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}
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static void __exit oaktrail_cleanup(void)
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{
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oaktrail_backlight_exit();
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oaktrail_rfkill_cleanup();
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platform_device_unregister(oaktrail_device);
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platform_driver_unregister(&oaktrail_driver);
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pr_info("Driver unloaded\n");
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}
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module_init(oaktrail_init);
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module_exit(oaktrail_cleanup);
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MODULE_AUTHOR("Yin Kangkai (kangkai.yin@intel.com)");
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MODULE_DESCRIPTION("Intel Oaktrail Platform ACPI Extras");
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MODULE_VERSION(DRIVER_VERSION);
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MODULE_LICENSE("GPL");
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