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linux/drivers/platform/x86/panasonic-laptop.c
Kenneth Chan 25dd390c62 platform/x86: panasonic-laptop: Add sysfs attributes for firmware brightness registers 
Panasonic laptops (at least from CF-W4 onwards) have dedicated firmware
registers for saving ac/dc and current brightness. They are a bit confusing
so here's some explanations:

AC_MIN_BRIGHT, AC_MAX_BRIGHT, DC_MIN_BRIGHT, DC_MAX_BRIGHT:
Read-only. Values: 0x01 and 0x15 respectively.

AC_CUR_BRIGHT, DC_CUR_BRIGHT:
Read-Write. 0x00-0xFF. Store user-defined AC/DC brightness. However,
they do not represent current brightness so they should be named AC_BRIGHT
and DC_BRIGHT instead.

CUR_BRIGHT (present since CF-W4):
Read-Write. 0x00-0xFF. It sets the current brightness. It won't update
itself if brightness is changed via other means, e.g. acpi_video0.

Another CUR_BRIGHT (added since CF-W5):
Read-Write. 0x01-0x15. Its value always synchronizes with current
brightness. Not implemented in this version.

Currently the backlight API interacts with AC_CUR_BRIGHT (probably because
it's the only bl register available in earlier models?). This patch adds
sysfs attributes for AC_CUR_BRIGHT, DC_CUR_BRIGHT and CUR_BRIGHT.

It also fixes the error of https://lkml.org/lkml/2020/8/19/1264.

PS: I think the backlight API should interact with CUR_BRIGHT instead of
AC_CUR_BRIGHT. But it involves complications like mapping between 0x01-0x15
or 0x00-0x14 (the backlight API) and 0x00-0xFF (CUR_BRIGHT). I'll leave the
discussion for a later version.

Signed-off-by: Kenneth Chan <kenneth.t.chan@gmail.com>
Link: https://lore.kernel.org/r/20200821181433.17653-10-kenneth.t.chan@gmail.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2020-11-10 14:49:50 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Panasonic HotKey and LCD brightness control driver
* (C) 2004 Hiroshi Miura <miura@da-cha.org>
* (C) 2004 NTT DATA Intellilink Co. http://www.intellilink.co.jp/
* (C) YOKOTA Hiroshi <yokota (at) netlab. is. tsukuba. ac. jp>
* (C) 2004 David Bronaugh <dbronaugh>
* (C) 2006-2008 Harald Welte <laforge@gnumonks.org>
*
* derived from toshiba_acpi.c, Copyright (C) 2002-2004 John Belmonte
*
*---------------------------------------------------------------------------
*
* ChangeLog:
* Aug.18, 2020 Kenneth Chan <kenneth.t.chan@gmail.com>
* -v0.98 add platform devices for firmware brightness registers
* add support for battery charging threshold (eco mode)
* resolve hotkey double trigger
* add write support to mute
* fix sticky_key init bug
* fix naming of platform files for consistency with other
* modules
* split MODULE_AUTHOR() by one author per macro call
* replace ACPI prints with pr_*() macros
* -v0.97 add support for cdpower hardware switch
* -v0.96 merge Lucina's enhancement
* Jan.13, 2009 Martin Lucina <mato@kotelna.sk>
* - add support for optical driver power in
* Y and W series
*
* Sep.23, 2008 Harald Welte <laforge@gnumonks.org>
* -v0.95 rename driver from drivers/acpi/pcc_acpi.c to
* drivers/misc/panasonic-laptop.c
*
* Jul.04, 2008 Harald Welte <laforge@gnumonks.org>
* -v0.94 replace /proc interface with device attributes
* support {set,get}keycode on th input device
*
* Jun.27, 2008 Harald Welte <laforge@gnumonks.org>
* -v0.92 merge with 2.6.26-rc6 input API changes
* remove broken <= 2.6.15 kernel support
* resolve all compiler warnings
* various coding style fixes (checkpatch.pl)
* add support for backlight api
* major code restructuring
*
* Dac.28, 2007 Harald Welte <laforge@gnumonks.org>
* -v0.91 merge with 2.6.24-rc6 ACPI changes
*
* Nov.04, 2006 Hiroshi Miura <miura@da-cha.org>
* -v0.9 remove warning about section reference.
* remove acpi_os_free
* add /proc/acpi/pcc/brightness interface for HAL access
* merge dbronaugh's enhancement
* Aug.17, 2004 David Bronaugh (dbronaugh)
* - Added screen brightness setting interface
* Thanks to FreeBSD crew (acpi_panasonic.c)
* for the ideas I needed to accomplish it
*
* May.29, 2006 Hiroshi Miura <miura@da-cha.org>
* -v0.8.4 follow to change keyinput structure
* thanks Fabian Yamaguchi <fabs@cs.tu-berlin.de>,
* Jacob Bower <jacob.bower@ic.ac.uk> and
* Hiroshi Yokota for providing solutions.
*
* Oct.02, 2004 Hiroshi Miura <miura@da-cha.org>
* -v0.8.2 merge code of YOKOTA Hiroshi
* <yokota@netlab.is.tsukuba.ac.jp>.
* Add sticky key mode interface.
* Refactoring acpi_pcc_generate_keyinput().
*
* Sep.15, 2004 Hiroshi Miura <miura@da-cha.org>
* -v0.8 Generate key input event on input subsystem.
* This is based on yet another driver written by
* Ryuta Nakanishi.
*
* Sep.10, 2004 Hiroshi Miura <miura@da-cha.org>
* -v0.7 Change proc interface functions using seq_file
* facility as same as other ACPI drivers.
*
* Aug.28, 2004 Hiroshi Miura <miura@da-cha.org>
* -v0.6.4 Fix a silly error with status checking
*
* Aug.25, 2004 Hiroshi Miura <miura@da-cha.org>
* -v0.6.3 replace read_acpi_int by standard function
* acpi_evaluate_integer
* some clean up and make smart copyright notice.
* fix return value of pcc_acpi_get_key()
* fix checking return value of acpi_bus_register_driver()
*
* Aug.22, 2004 David Bronaugh <dbronaugh@linuxboxen.org>
* -v0.6.2 Add check on ACPI data (num_sifr)
* Coding style cleanups, better error messages/handling
* Fixed an off-by-one error in memory allocation
*
* Aug.21, 2004 David Bronaugh <dbronaugh@linuxboxen.org>
* -v0.6.1 Fix a silly error with status checking
*
* Aug.20, 2004 David Bronaugh <dbronaugh@linuxboxen.org>
* - v0.6 Correct brightness controls to reflect reality
* based on information gleaned by Hiroshi Miura
* and discussions with Hiroshi Miura
*
* Aug.10, 2004 Hiroshi Miura <miura@da-cha.org>
* - v0.5 support LCD brightness control
* based on the disclosed information by MEI.
*
* Jul.25, 2004 Hiroshi Miura <miura@da-cha.org>
* - v0.4 first post version
* add function to retrive SIFR
*
* Jul.24, 2004 Hiroshi Miura <miura@da-cha.org>
* - v0.3 get proper status of hotkey
*
* Jul.22, 2004 Hiroshi Miura <miura@da-cha.org>
* - v0.2 add HotKey handler
*
* Jul.17, 2004 Hiroshi Miura <miura@da-cha.org>
* - v0.1 start from toshiba_acpi driver written by John Belmonte
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/backlight.h>
#include <linux/ctype.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/platform_device.h>
MODULE_AUTHOR("Hiroshi Miura <miura@da-cha.org>");
MODULE_AUTHOR("David Bronaugh <dbronaugh@linuxboxen.org>");
MODULE_AUTHOR("Harald Welte <laforge@gnumonks.org>");
MODULE_AUTHOR("Martin Lucina <mato@kotelna.sk>");
MODULE_AUTHOR("Kenneth Chan <kenneth.t.chan@gmail.com>");
MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
MODULE_LICENSE("GPL");
#define LOGPREFIX "pcc_acpi: "
/* Define ACPI PATHs */
/* Lets note hotkeys */
#define METHOD_HKEY_QUERY "HINF"
#define METHOD_HKEY_SQTY "SQTY"
#define METHOD_HKEY_SINF "SINF"
#define METHOD_HKEY_SSET "SSET"
#define METHOD_ECWR "\\_SB.ECWR"
#define HKEY_NOTIFY 0x80
#define ECO_MODE_OFF 0x00
#define ECO_MODE_ON 0x80
#define ACPI_PCC_DRIVER_NAME "Panasonic Laptop Support"
#define ACPI_PCC_DEVICE_NAME "Hotkey"
#define ACPI_PCC_CLASS "pcc"
#define ACPI_PCC_INPUT_PHYS "panasonic/hkey0"
/* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
ECO_MODEs: 0x03 = off, 0x83 = on
*/
enum SINF_BITS { SINF_NUM_BATTERIES = 0,
SINF_LCD_TYPE,
SINF_AC_MAX_BRIGHT,
SINF_AC_MIN_BRIGHT,
SINF_AC_CUR_BRIGHT,
SINF_DC_MAX_BRIGHT,
SINF_DC_MIN_BRIGHT,
SINF_DC_CUR_BRIGHT,
SINF_MUTE,
SINF_RESERVED,
SINF_ECO_MODE = 0x0A,
SINF_CUR_BRIGHT = 0x0D,
SINF_STICKY_KEY = 0x80,
};
/* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
static int acpi_pcc_hotkey_add(struct acpi_device *device);
static int acpi_pcc_hotkey_remove(struct acpi_device *device);
static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
static const struct acpi_device_id pcc_device_ids[] = {
{ "MAT0012", 0},
{ "MAT0013", 0},
{ "MAT0018", 0},
{ "MAT0019", 0},
{ "", 0},
};
MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
#ifdef CONFIG_PM_SLEEP
static int acpi_pcc_hotkey_resume(struct device *dev);
#endif
static SIMPLE_DEV_PM_OPS(acpi_pcc_hotkey_pm, NULL, acpi_pcc_hotkey_resume);
static struct acpi_driver acpi_pcc_driver = {
.name = ACPI_PCC_DRIVER_NAME,
.class = ACPI_PCC_CLASS,
.ids = pcc_device_ids,
.ops = {
.add = acpi_pcc_hotkey_add,
.remove = acpi_pcc_hotkey_remove,
.notify = acpi_pcc_hotkey_notify,
},
.drv.pm = &acpi_pcc_hotkey_pm,
};
static const struct key_entry panasonic_keymap[] = {
{ KE_KEY, 0, { KEY_RESERVED } },
{ KE_KEY, 1, { KEY_BRIGHTNESSDOWN } },
{ KE_KEY, 2, { KEY_BRIGHTNESSUP } },
{ KE_KEY, 3, { KEY_DISPLAYTOGGLE } },
{ KE_KEY, 4, { KEY_MUTE } },
{ KE_KEY, 5, { KEY_VOLUMEDOWN } },
{ KE_KEY, 6, { KEY_VOLUMEUP } },
{ KE_KEY, 7, { KEY_SLEEP } },
{ KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */
{ KE_KEY, 9, { KEY_BATTERY } },
{ KE_KEY, 10, { KEY_SUSPEND } },
{ KE_END, 0 }
};
struct pcc_acpi {
acpi_handle handle;
unsigned long num_sifr;
int sticky_key;
int eco_mode;
int mute;
int ac_brightness;
int dc_brightness;
int current_brightness;
u32 *sinf;
struct acpi_device *device;
struct input_dev *input_dev;
struct backlight_device *backlight;
struct platform_device *platform;
};
/* method access functions */
static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
{
union acpi_object in_objs[] = {
{ .integer.type = ACPI_TYPE_INTEGER,
.integer.value = func, },
{ .integer.type = ACPI_TYPE_INTEGER,
.integer.value = val, },
};
struct acpi_object_list params = {
.count = ARRAY_SIZE(in_objs),
.pointer = in_objs,
};
acpi_status status = AE_OK;
status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
&params, NULL);
return (status == AE_OK) ? 0 : -EIO;
}
static inline int acpi_pcc_get_sqty(struct acpi_device *device)
{
unsigned long long s;
acpi_status status;
status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
NULL, &s);
if (ACPI_SUCCESS(status))
return s;
else {
pr_err("evaluation error HKEY.SQTY\n");
return -EINVAL;
}
}
static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc)
{
acpi_status status;
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
union acpi_object *hkey = NULL;
int i;
status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
&buffer);
if (ACPI_FAILURE(status)) {
pr_err("evaluation error HKEY.SINF\n");
return 0;
}
hkey = buffer.pointer;
if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
pr_err("Invalid HKEY.SINF\n");
status = AE_ERROR;
goto end;
}
if (pcc->num_sifr < hkey->package.count) {
pr_err("SQTY reports bad SINF length\n");
status = AE_ERROR;
goto end;
}
for (i = 0; i < hkey->package.count; i++) {
union acpi_object *element = &(hkey->package.elements[i]);
if (likely(element->type == ACPI_TYPE_INTEGER)) {
pcc->sinf[i] = element->integer.value;
} else
pr_err("Invalid HKEY.SINF data\n");
}
pcc->sinf[hkey->package.count] = -1;
end:
kfree(buffer.pointer);
return status == AE_OK;
}
/* backlight API interface functions */
/* This driver currently treats AC and DC brightness identical,
* since we don't need to invent an interface to the core ACPI
* logic to receive events in case a power supply is plugged in
* or removed */
static int bl_get(struct backlight_device *bd)
{
struct pcc_acpi *pcc = bl_get_data(bd);
if (!acpi_pcc_retrieve_biosdata(pcc))
return -EIO;
return pcc->sinf[SINF_AC_CUR_BRIGHT];
}
static int bl_set_status(struct backlight_device *bd)
{
struct pcc_acpi *pcc = bl_get_data(bd);
int bright = bd->props.brightness;
int rc;
if (!acpi_pcc_retrieve_biosdata(pcc))
return -EIO;
if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
return -EINVAL;
rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
if (rc < 0)
return rc;
return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
}
static const struct backlight_ops pcc_backlight_ops = {
.get_brightness = bl_get,
.update_status = bl_set_status,
};
/* returns ACPI_SUCCESS if methods to control optical drive are present */
static acpi_status check_optd_present(void)
{
acpi_status status = AE_OK;
acpi_handle handle;
status = acpi_get_handle(NULL, "\\_SB.STAT", &handle);
if (ACPI_FAILURE(status))
goto out;
status = acpi_get_handle(NULL, "\\_SB.FBAY", &handle);
if (ACPI_FAILURE(status))
goto out;
status = acpi_get_handle(NULL, "\\_SB.CDDI", &handle);
if (ACPI_FAILURE(status))
goto out;
out:
return status;
}
/* get optical driver power state */
static int get_optd_power_state(void)
{
acpi_status status;
unsigned long long state;
int result;
status = acpi_evaluate_integer(NULL, "\\_SB.STAT", NULL, &state);
if (ACPI_FAILURE(status)) {
pr_err("evaluation error _SB.STAT\n");
result = -EIO;
goto out;
}
switch (state) {
case 0: /* power off */
result = 0;
break;
case 0x0f: /* power on */
result = 1;
break;
default:
result = -EIO;
break;
}
out:
return result;
}
/* set optical drive power state */
static int set_optd_power_state(int new_state)
{
int result;
acpi_status status;
result = get_optd_power_state();
if (result < 0)
goto out;
if (new_state == result)
goto out;
switch (new_state) {
case 0: /* power off */
/* Call CDDR instead, since they both call the same method
* while CDDI takes 1 arg and we are not quite sure what it is.
*/
status = acpi_evaluate_object(NULL, "\\_SB.CDDR", NULL, NULL);
if (ACPI_FAILURE(status)) {
pr_err("evaluation error _SB.CDDR\n");
result = -EIO;
}
break;
case 1: /* power on */
status = acpi_evaluate_object(NULL, "\\_SB.FBAY", NULL, NULL);
if (ACPI_FAILURE(status)) {
pr_err("evaluation error _SB.FBAY\n");
result = -EIO;
}
break;
default:
result = -EINVAL;
break;
}
out:
return result;
}
/* sysfs user interface functions */
static ssize_t numbatt_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
if (!acpi_pcc_retrieve_biosdata(pcc))
return -EIO;
return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
}
static ssize_t lcdtype_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
if (!acpi_pcc_retrieve_biosdata(pcc))
return -EIO;
return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
}
static ssize_t mute_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
if (!acpi_pcc_retrieve_biosdata(pcc))
return -EIO;
return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
}
static ssize_t mute_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
int err, val;
err = kstrtoint(buf, 0, &val);
if (err)
return err;
if (val == 0 || val == 1) {
acpi_pcc_write_sset(pcc, SINF_MUTE, val);
pcc->mute = val;
}
return count;
}
static ssize_t sticky_key_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
if (!acpi_pcc_retrieve_biosdata(pcc))
return -EIO;
return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sticky_key);
}
static ssize_t sticky_key_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
int err, val;
err = kstrtoint(buf, 0, &val);
if (err)
return err;
if (val == 0 || val == 1) {
acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
pcc->sticky_key = val;
}
return count;
}
static ssize_t eco_mode_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
int result;
if (!acpi_pcc_retrieve_biosdata(pcc))
return -EIO;
switch (pcc->sinf[SINF_ECO_MODE]) {
case (ECO_MODE_OFF + 3):
result = 0;
break;
case (ECO_MODE_ON + 3):
result = 1;
break;
default:
result = -EIO;
break;
}
return snprintf(buf, PAGE_SIZE, "%u\n", result);
}
static ssize_t eco_mode_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
int err, state;
union acpi_object param[2];
struct acpi_object_list input;
acpi_status status;
param[0].type = ACPI_TYPE_INTEGER;
param[0].integer.value = 0x15;
param[1].type = ACPI_TYPE_INTEGER;
input.count = 2;
input.pointer = param;
err = kstrtoint(buf, 0, &state);
if (err)
return err;
switch (state) {
case 0:
param[1].integer.value = ECO_MODE_OFF;
pcc->sinf[SINF_ECO_MODE] = 0;
pcc->eco_mode = 0;
break;
case 1:
param[1].integer.value = ECO_MODE_ON;
pcc->sinf[SINF_ECO_MODE] = 1;
pcc->eco_mode = 1;
break;
default:
/* nothing to do */
return count;
}
status = acpi_evaluate_object(NULL, METHOD_ECWR,
&input, NULL);
if (ACPI_FAILURE(status)) {
pr_err("%s evaluation failed\n", METHOD_ECWR);
return -EINVAL;
}
return count;
}
static ssize_t ac_brightness_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
if (!acpi_pcc_retrieve_biosdata(pcc))
return -EIO;
return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_AC_CUR_BRIGHT]);
}
static ssize_t ac_brightness_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
int err, val;
err = kstrtoint(buf, 0, &val);
if (err)
return err;
if (val >= 0 && val <= 255) {
acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, val);
pcc->ac_brightness = val;
}
return count;
}
static ssize_t dc_brightness_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
if (!acpi_pcc_retrieve_biosdata(pcc))
return -EIO;
return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_DC_CUR_BRIGHT]);
}
static ssize_t dc_brightness_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
int err, val;
err = kstrtoint(buf, 0, &val);
if (err)
return err;
if (val >= 0 && val <= 255) {
acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, val);
pcc->dc_brightness = val;
}
return count;
}
static ssize_t current_brightness_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
if (!acpi_pcc_retrieve_biosdata(pcc))
return -EIO;
return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_CUR_BRIGHT]);
}
static ssize_t current_brightness_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct acpi_device *acpi = to_acpi_device(dev);
struct pcc_acpi *pcc = acpi_driver_data(acpi);
int err, val;
err = kstrtoint(buf, 0, &val);
if (err)
return err;
if (val >= 0 && val <= 255) {
err = acpi_pcc_write_sset(pcc, SINF_CUR_BRIGHT, val);
pcc->current_brightness = val;
}
return count;
}
static ssize_t cdpower_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%d\n", get_optd_power_state());
}
static ssize_t cdpower_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int err, val;
err = kstrtoint(buf, 10, &val);
if (err)
return err;
set_optd_power_state(val);
return count;
}
static DEVICE_ATTR_RO(numbatt);
static DEVICE_ATTR_RO(lcdtype);
static DEVICE_ATTR_RW(mute);
static DEVICE_ATTR_RW(sticky_key);
static DEVICE_ATTR_RW(eco_mode);
static DEVICE_ATTR_RW(ac_brightness);
static DEVICE_ATTR_RW(dc_brightness);
static DEVICE_ATTR_RW(current_brightness);
static DEVICE_ATTR_RW(cdpower);
static struct attribute *pcc_sysfs_entries[] = {
&dev_attr_numbatt.attr,
&dev_attr_lcdtype.attr,
&dev_attr_mute.attr,
&dev_attr_sticky_key.attr,
&dev_attr_eco_mode.attr,
&dev_attr_ac_brightness.attr,
&dev_attr_dc_brightness.attr,
&dev_attr_current_brightness.attr,
&dev_attr_cdpower.attr,
NULL,
};
static const struct attribute_group pcc_attr_group = {
.name = NULL, /* put in device directory */
.attrs = pcc_sysfs_entries,
};
/* hotkey input device driver */
static int sleep_keydown_seen;
static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
{
struct input_dev *hotk_input_dev = pcc->input_dev;
int rc;
unsigned long long result;
rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
NULL, &result);
if (ACPI_FAILURE(rc)) {
pr_err("error getting hotkey status\n");
return;
}
/* hack: some firmware sends no key down for sleep / hibernate */
if ((result & 0xf) == 0x7 || (result & 0xf) == 0xa) {
if (result & 0x80)
sleep_keydown_seen = 1;
if (!sleep_keydown_seen)
sparse_keymap_report_event(hotk_input_dev,
result & 0xf, 0x80, false);
}
if ((result & 0xf) == 0x7 || (result & 0xf) == 0x9 || (result & 0xf) == 0xa) {
if (!sparse_keymap_report_event(hotk_input_dev,
result & 0xf, result & 0x80, false))
pr_err("Unknown hotkey event: 0x%04llx\n", result);
}
}
static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
{
struct pcc_acpi *pcc = acpi_driver_data(device);
switch (event) {
case HKEY_NOTIFY:
acpi_pcc_generate_keyinput(pcc);
break;
default:
/* nothing to do */
break;
}
}
static void pcc_optd_notify(acpi_handle handle, u32 event, void *data)
{
if (event != ACPI_NOTIFY_EJECT_REQUEST)
return;
set_optd_power_state(0);
}
static int pcc_register_optd_notifier(struct pcc_acpi *pcc, char *node)
{
acpi_status status;
acpi_handle handle;
status = acpi_get_handle(NULL, node, &handle);
if (ACPI_SUCCESS(status)) {
status = acpi_install_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
pcc_optd_notify, pcc);
if (ACPI_FAILURE(status))
pr_err("Failed to register notify on %s\n", node);
} else
return -ENODEV;
return 0;
}
static void pcc_unregister_optd_notifier(struct pcc_acpi *pcc, char *node)
{
acpi_status status = AE_OK;
acpi_handle handle;
status = acpi_get_handle(NULL, node, &handle);
if (ACPI_SUCCESS(status)) {
status = acpi_remove_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
pcc_optd_notify);
if (ACPI_FAILURE(status))
pr_err("Error removing optd notify handler %s\n",
node);
}
}
static int acpi_pcc_init_input(struct pcc_acpi *pcc)
{
struct input_dev *input_dev;
int error;
input_dev = input_allocate_device();
if (!input_dev)
return -ENOMEM;
input_dev->name = ACPI_PCC_DRIVER_NAME;
input_dev->phys = ACPI_PCC_INPUT_PHYS;
input_dev->id.bustype = BUS_HOST;
input_dev->id.vendor = 0x0001;
input_dev->id.product = 0x0001;
input_dev->id.version = 0x0100;
error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL);
if (error) {
pr_err("Unable to setup input device keymap\n");
goto err_free_dev;
}
error = input_register_device(input_dev);
if (error) {
pr_err("Unable to register input device\n");
goto err_free_dev;
}
pcc->input_dev = input_dev;
return 0;
err_free_dev:
input_free_device(input_dev);
return error;
}
/* kernel module interface */
#ifdef CONFIG_PM_SLEEP
static int acpi_pcc_hotkey_resume(struct device *dev)
{
struct pcc_acpi *pcc;
if (!dev)
return -EINVAL;
pcc = acpi_driver_data(to_acpi_device(dev));
if (!pcc)
return -EINVAL;
acpi_pcc_write_sset(pcc, SINF_MUTE, pcc->mute);
acpi_pcc_write_sset(pcc, SINF_ECO_MODE, pcc->eco_mode);
acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_key);
acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, pcc->ac_brightness);
acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, pcc->dc_brightness);
acpi_pcc_write_sset(pcc, SINF_CUR_BRIGHT, pcc->current_brightness);
return 0;
}
#endif
static int acpi_pcc_hotkey_add(struct acpi_device *device)
{
struct backlight_properties props;
struct pcc_acpi *pcc;
int num_sifr, result;
if (!device)
return -EINVAL;
num_sifr = acpi_pcc_get_sqty(device);
if (num_sifr < 0 || num_sifr > 255) {
pr_err("num_sifr out of range");
return -ENODEV;
}
pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
if (!pcc) {
pr_err("Couldn't allocate mem for pcc");
return -ENOMEM;
}
pcc->sinf = kcalloc(num_sifr + 1, sizeof(u32), GFP_KERNEL);
if (!pcc->sinf) {
result = -ENOMEM;
goto out_hotkey;
}
pcc->device = device;
pcc->handle = device->handle;
pcc->num_sifr = num_sifr;
device->driver_data = pcc;
strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
result = acpi_pcc_init_input(pcc);
if (result) {
pr_err("Error installing keyinput handler\n");
goto out_sinf;
}
if (!acpi_pcc_retrieve_biosdata(pcc)) {
result = -EIO;
pr_err("Couldn't retrieve BIOS data\n");
goto out_input;
}
/* initialize backlight */
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_PLATFORM;
props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
&pcc_backlight_ops, &props);
if (IS_ERR(pcc->backlight)) {
result = PTR_ERR(pcc->backlight);
goto out_input;
}
/* read the initial brightness setting from the hardware */
pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
/* Reset initial sticky key mode since the hardware register state is not consistent */
acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, 0);
pcc->sticky_key = 0;
pcc->eco_mode = pcc->sinf[SINF_ECO_MODE];
pcc->mute = pcc->sinf[SINF_MUTE];
pcc->ac_brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
pcc->dc_brightness = pcc->sinf[SINF_DC_CUR_BRIGHT];
result = pcc->current_brightness = pcc->sinf[SINF_CUR_BRIGHT];
/* add sysfs attributes */
result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
if (result)
goto out_backlight;
/* optical drive initialization */
if (ACPI_SUCCESS(check_optd_present())) {
pcc->platform = platform_device_register_simple("panasonic",
-1, NULL, 0);
if (IS_ERR(pcc->platform)) {
result = PTR_ERR(pcc->platform);
goto out_backlight;
}
result = device_create_file(&pcc->platform->dev,
&dev_attr_cdpower);
pcc_register_optd_notifier(pcc, "\\_SB.PCI0.EHCI.ERHB.OPTD");
if (result)
goto out_platform;
} else {
pcc->platform = NULL;
}
return 0;
out_platform:
platform_device_unregister(pcc->platform);
out_backlight:
backlight_device_unregister(pcc->backlight);
out_input:
input_unregister_device(pcc->input_dev);
out_sinf:
kfree(pcc->sinf);
out_hotkey:
kfree(pcc);
return result;
}
static int acpi_pcc_hotkey_remove(struct acpi_device *device)
{
struct pcc_acpi *pcc = acpi_driver_data(device);
if (!device || !pcc)
return -EINVAL;
if (pcc->platform) {
device_remove_file(&pcc->platform->dev, &dev_attr_cdpower);
platform_device_unregister(pcc->platform);
}
pcc_unregister_optd_notifier(pcc, "\\_SB.PCI0.EHCI.ERHB.OPTD");
sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
backlight_device_unregister(pcc->backlight);
input_unregister_device(pcc->input_dev);
kfree(pcc->sinf);
kfree(pcc);
return 0;
}
module_acpi_driver(acpi_pcc_driver);
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