Message-Id: <200909300950.39332.bjorn.helgaas@hp.com>
Date:	Wed, 30 Sep 2009 09:50:38 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
Cc:	linux-kernel@...r.kernel.org, len.brown@...el.com, don@...t.com.br,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH] cmpc_acpi: Added support for Classmate PC ACPI devices.

On Monday 28 September 2009 07:38:00 pm Thadeu Lima de Souza Cascardo wrote:
> This add supports for devices like keyboard, backlight, tablet and
> accelerometer.

Something about the PNP IDs bothered me yesterday, but I couldn't
figure out what.  You're using:

  ACCE0000
  TBLT0000
  IPML200
  FnBT0000

Normally these OEM-specific ACPI drivers claim PNP IDs like ATK0100,
TOS6200, FUJ02B1, etc., that are obviously OEM-specific.

But the ones you're claiming seem pretty generic, like things
we could imagine appearing on machines other than the Classmate.

So I guess my question is, "Are these really generic?  If so, should
this be split into separate, non-Classmate named drivers, such as
'accelerometer', 'tablet', etc.?"

Bjorn

> 
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
> ---
>  MAINTAINERS                      |    6 +
>  drivers/platform/x86/Kconfig     |   12 +
>  drivers/platform/x86/Makefile    |    1 +
>  drivers/platform/x86/cmpc_acpi.c |  522 ++++++++++++++++++++++++++++++++++++++
>  4 files changed, 541 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/platform/x86/cmpc_acpi.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c450f3a..9e14df1 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1368,6 +1368,12 @@ L:	linux-scsi@...r.kernel.org
>  S:	Supported
>  F:	drivers/scsi/fnic/
>  
> +CMPC ACPI DRIVER
> +M:	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
> +M:	Daniel Oliveira Nascimento <don@...t.com.br>
> +S:	Supported
> +F:	drivers/platform/x86/cmpc_acpi.c
> +
>  CODA FILE SYSTEM
>  M:	Jan Harkes <jaharkes@...cmu.edu>
>  M:	coda@...cmu.edu
> diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> index 55ca39d..2cbc6a6 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -435,4 +435,16 @@ config ACPI_TOSHIBA
>  
>  	  If you have a legacy free Toshiba laptop (such as the Libretto L1
>  	  series), say Y.
> +
> +config ACPI_CMPC
> +	tristate "CMPC Laptop Extras"
> +	depends on X86
> +	select INPUT
> +	select BACKLIGHT_CLASS_DEVICE
> +	default n
> +	help
> +	  Support for Intel Classmate PC ACPI devices, including some
> +	  keys as input device, backlight device, tablet and accelerometer
> +	  devices.
> +
>  endif # X86_PLATFORM_DEVICES
> diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
> index d1c1621..fc92247 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -21,3 +21,4 @@ obj-$(CONFIG_ACPI_WMI)		+= wmi.o
>  obj-$(CONFIG_ACPI_ASUS)		+= asus_acpi.o
>  obj-$(CONFIG_TOPSTAR_LAPTOP)	+= topstar-laptop.o
>  obj-$(CONFIG_ACPI_TOSHIBA)	+= toshiba_acpi.o
> +obj-$(CONFIG_ACPI_CMPC)		+= cmpc_acpi.o
> diff --git a/drivers/platform/x86/cmpc_acpi.c b/drivers/platform/x86/cmpc_acpi.c
> new file mode 100644
> index 0000000..c77c855
> --- /dev/null
> +++ b/drivers/platform/x86/cmpc_acpi.c
> @@ -0,0 +1,522 @@
> +/*
> + *  Copyright (C) 2009  Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
> + *
> + *  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.
> + */
> +
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/workqueue.h>
> +#include <acpi/acpi_drivers.h>
> +#include <linux/backlight.h>
> +#include <linux/input.h>
> +
> +MODULE_LICENSE("GPL");
> +
> +
> +/*
> + * Generic input device code.
> + */
> +
> +typedef void (*input_device_init)(struct input_dev *dev);
> +
> +static int cmpc_add_acpi_notify_device(struct acpi_device *acpi, char *name,
> +				       acpi_notify_handler handler,
> +				       input_device_init idev_init)
> +{
> +	struct input_dev *inputdev;
> +	acpi_status status;
> +	int error;
> +	inputdev = input_allocate_device();
> +	if (!inputdev) {
> +		error = -ENOMEM;
> +		goto out;
> +	}
> +	inputdev->name = name;
> +	inputdev->dev.parent = &acpi->dev;
> +	idev_init(inputdev);
> +	error = input_register_device(inputdev);
> +	if (error)
> +		goto err_reg;
> +	dev_set_drvdata(&acpi->dev, inputdev);
> +	status = acpi_install_notify_handler(acpi->handle, ACPI_DEVICE_NOTIFY,
> +					     handler, inputdev);
> +	if (ACPI_FAILURE(status)) {
> +		error = -ENODEV;
> +		goto err_acpi;
> +	}
> +	return 0;
> +err_acpi:
> +	input_unregister_device(inputdev);
> +err_reg:
> +	input_free_device(inputdev);
> +out:
> +	return error;
> +}
> +
> +static int cmpc_remove_acpi_notify_device(struct acpi_device *acpi,
> +					  acpi_notify_handler handler)
> +{
> +	struct input_dev *inputdev;
> +	acpi_status status;
> +	status = acpi_remove_notify_handler(acpi->handle, ACPI_DEVICE_NOTIFY,
> +					    handler);
> +	inputdev = dev_get_drvdata(&acpi->dev);
> +	input_unregister_device(inputdev);
> +	input_free_device(inputdev);
> +	return 0;
> +}
> +
> +
> +/*
> + * Accelerometer code.
> + */
> +
> +static acpi_status cmpc_start_accel(acpi_handle handle)
> +{
> +	union acpi_object param[2];
> +	struct acpi_object_list input;
> +	acpi_status status;
> +	param[0].type = ACPI_TYPE_INTEGER;
> +	param[0].integer.value = 0x3;
> +	param[1].type = ACPI_TYPE_INTEGER;
> +	input.count = 2;
> +	input.pointer = param;
> +	status = acpi_evaluate_object(handle, "ACMD", &input, NULL);
> +	return status;
> +}
> +
> +static acpi_status cmpc_stop_accel(acpi_handle handle)
> +{
> +	union acpi_object param[2];
> +	struct acpi_object_list input;
> +	acpi_status status;
> +	param[0].type = ACPI_TYPE_INTEGER;
> +	param[0].integer.value = 0x4;
> +	param[1].type = ACPI_TYPE_INTEGER;
> +	input.count = 2;
> +	input.pointer = param;
> +	status = acpi_evaluate_object(handle, "ACMD", &input, NULL);
> +	return status;
> +}
> +
> +static acpi_status cmpc_accel_set_sense(acpi_handle handle, int val)
> +{
> +	union acpi_object param[2];
> +	struct acpi_object_list input;
> +	param[0].type = ACPI_TYPE_INTEGER;
> +	param[0].integer.value = 0x02;
> +	param[1].type = ACPI_TYPE_INTEGER;
> +	param[1].integer.value = val;
> +	input.count = 2;
> +	input.pointer = param;
> +	return acpi_evaluate_object(handle, "ACMD", &input, NULL);
> +}
> +
> +static acpi_status cmpc_get_accel(acpi_handle handle,
> +				  unsigned char *x,
> +				  unsigned char *y,
> +				  unsigned char *z)
> +{
> +	union acpi_object param[2];
> +	struct acpi_object_list input;
> +	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, 0 };
> +	unsigned char *locs;
> +	acpi_status status;
> +	param[0].type = ACPI_TYPE_INTEGER;
> +	param[0].integer.value = 0x01;
> +	param[1].type = ACPI_TYPE_INTEGER;
> +	input.count = 2;
> +	input.pointer = param;
> +	status = acpi_evaluate_object(handle, "ACMD", &input, &output);
> +	if (ACPI_SUCCESS(status)) {
> +		union acpi_object *obj;
> +		obj = output.pointer;
> +		locs = obj->buffer.pointer;
> +		*x = locs[0];
> +		*y = locs[1];
> +		*z = locs[2];
> +		kfree(output.pointer);
> +	}
> +	return status;
> +}
> +
> +static void cmpc_accel_handler(acpi_handle handle, u32 event, void *ctx)
> +{
> +	struct input_dev *inputdev = ctx;
> +	acpi_status status;
> +	unsigned char x, y, z;
> +	if (event == 0x81) {
> +		status = cmpc_get_accel(handle, &x, &y, &z);
> +		if (ACPI_SUCCESS(status)) {
> +			input_report_abs(inputdev, ABS_X, x);
> +			input_report_abs(inputdev, ABS_Y, y);
> +			input_report_abs(inputdev, ABS_Z, z);
> +			input_sync(inputdev);
> +		}
> +	}
> +}
> +
> +static ssize_t cmpc_accel_sense_store(struct device *dev,
> +				      struct device_attribute *attr,
> +				      const char *buf, size_t count)
> +{
> +	struct acpi_device *acpi;
> +	int sense;
> +	acpi = to_acpi_device(dev);
> +	if (sscanf(buf, "%d", &sense) <= 0)
> +		return -EINVAL;
> +	cmpc_accel_set_sense(acpi->handle, sense);
> +	return strnlen(buf, count);
> +}
> +
> +struct device_attribute cmpc_accel_sense_attr = {
> +	.attr = { .name = "sense", .mode = 0220 },
> +	.store = cmpc_accel_sense_store
> +};
> +
> +static int cmpc_accel_open(struct input_dev *input)
> +{
> +	struct acpi_device *acpi;
> +	acpi = to_acpi_device(input->dev.parent);
> +	if (ACPI_SUCCESS(cmpc_start_accel(acpi->handle)))
> +		return 0;
> +	return -EIO;
> +}
> +
> +static void cmpc_accel_close(struct input_dev *input)
> +{
> +	struct acpi_device *acpi;
> +	acpi = to_acpi_device(input->dev.parent);
> +	cmpc_stop_accel(acpi->handle);
> +}
> +
> +static void cmpc_accel_idev_init(struct input_dev *inputdev)
> +{
> +	set_bit(EV_ABS, inputdev->evbit);
> +	input_set_abs_params(inputdev, ABS_X, 0, 255, 8, 0);
> +	input_set_abs_params(inputdev, ABS_Y, 0, 255, 8, 0);
> +	input_set_abs_params(inputdev, ABS_Z, 0, 255, 8, 0);
> +	inputdev->open = cmpc_accel_open;
> +	inputdev->close = cmpc_accel_close;
> +}
> +
> +static int cmpc_accel_add(struct acpi_device *acpi)
> +{
> +	int error;
> +	error = device_create_file(&acpi->dev, &cmpc_accel_sense_attr);
> +	if (error)
> +		return error;
> +	return cmpc_add_acpi_notify_device(acpi, "cmpc_accel",
> +					   cmpc_accel_handler,
> +					   cmpc_accel_idev_init);
> +}
> +
> +static int cmpc_accel_remove(struct acpi_device *acpi, int type)
> +{
> +	device_remove_file(&acpi->dev, &cmpc_accel_sense_attr);
> +	return cmpc_remove_acpi_notify_device(acpi, cmpc_accel_handler);
> +}
> +
> +static const struct acpi_device_id cmpc_accel_device_ids[] = {
> +	{"ACCE0000", 0},
> +	{"", 0}
> +};
> +MODULE_DEVICE_TABLE(acpi, cmpc_accel_device_ids);
> +
> +static struct acpi_driver cmpc_accel_acpi_driver = {
> +	.name = "cmpc_accel",
> +	.class = "cmpc_accel",
> +	.ids = cmpc_accel_device_ids,
> +	.ops = {
> +		.add = cmpc_accel_add,
> +		.remove = cmpc_accel_remove
> +	}
> +};
> +
> +static bool cmpc_accel_driver_registered;
> +
> +
> +/*
> + * Tablet mode code.
> + */
> +static acpi_status cmpc_get_tablet(acpi_handle handle,
> +				   unsigned long long *value)
> +{
> +	union acpi_object param;
> +	struct acpi_object_list input;
> +	unsigned long long output;
> +	acpi_status status;
> +	param.type = ACPI_TYPE_INTEGER;
> +	param.integer.value = 0x01;
> +	input.count = 1;
> +	input.pointer = &param;
> +	status = acpi_evaluate_integer(handle, "TCMD", &input, &output);
> +	if (ACPI_SUCCESS(status))
> +		*value = output;
> +	return status;
> +}
> +
> +static void cmpc_tablet_handler(acpi_handle handle, u32 event, void *ctx)
> +{
> +	unsigned long long val = 0;
> +	struct input_dev *inputdev = ctx;
> +	if (event == 0x81) {
> +		if (ACPI_SUCCESS(cmpc_get_tablet(handle, &val)))
> +			input_report_switch(inputdev, SW_TABLET_MODE, !val);
> +	}
> +}
> +
> +static void cmpc_tablet_idev_init(struct input_dev *inputdev)
> +{
> +	set_bit(EV_SW, inputdev->evbit);
> +	set_bit(SW_TABLET_MODE, inputdev->swbit);
> +}
> +
> +static int cmpc_tablet_add(struct acpi_device *acpi)
> +{
> +	return cmpc_add_acpi_notify_device(acpi, "cmpc_tablet",
> +					   cmpc_tablet_handler,
> +					   cmpc_tablet_idev_init);
> +}
> +
> +static int cmpc_tablet_remove(struct acpi_device *acpi, int type)
> +{
> +	return cmpc_remove_acpi_notify_device(acpi, cmpc_tablet_handler);
> +}
> +
> +static const struct acpi_device_id cmpc_tablet_device_ids[] = {
> +	{"TBLT0000", 0},
> +	{"", 0}
> +};
> +MODULE_DEVICE_TABLE(acpi, cmpc_tablet_device_ids);
> +
> +static struct acpi_driver cmpc_tablet_acpi_driver = {
> +	.name = "cmpc_tablet",
> +	.class = "cmpc_tablet",
> +	.ids = cmpc_tablet_device_ids,
> +	.ops = {
> +		.add = cmpc_tablet_add,
> +		.remove = cmpc_tablet_remove
> +	}
> +};
> +
> +static bool cmpc_tablet_driver_registered;
> +
> +
> +/*
> + * Backlight code.
> + */
> +
> +static acpi_status cmpc_get_brightness(acpi_handle handle,
> +				       unsigned long long *value)
> +{
> +	union acpi_object param;
> +	struct acpi_object_list input;
> +	unsigned long long output;
> +	acpi_status status;
> +	param.type = ACPI_TYPE_INTEGER;
> +	param.integer.value = 0xC0;
> +	input.count = 1;
> +	input.pointer = &param;
> +	status = acpi_evaluate_integer(handle, "GRDI", &input, &output);
> +	if (ACPI_SUCCESS(status))
> +		*value = output;
> +	return status;
> +}
> +
> +static acpi_status cmpc_set_brightness(acpi_handle handle,
> +				       unsigned long long value)
> +{
> +	union acpi_object param[2];
> +	struct acpi_object_list input;
> +	acpi_status status;
> +	unsigned long long output;
> +	param[0].type = ACPI_TYPE_INTEGER;
> +	param[0].integer.value = 0xC0;
> +	param[1].type = ACPI_TYPE_INTEGER;
> +	param[1].integer.value = value;
> +	input.count = 2;
> +	input.pointer = param;
> +	status = acpi_evaluate_integer(handle, "GWRI", &input, &output);
> +	return status;
> +}
> +
> +static int cmpc_bl_get_brightness(struct backlight_device *bd)
> +{
> +	acpi_status status;
> +	acpi_handle handle;
> +	unsigned long long brightness;
> +	handle = bl_get_data(bd);
> +	status = cmpc_get_brightness(handle, &brightness);
> +	if (ACPI_SUCCESS(status))
> +		return brightness;
> +	else
> +		return -1;
> +}
> +
> +static int cmpc_bl_update_status(struct backlight_device *bd)
> +{
> +	acpi_status status;
> +	acpi_handle handle;
> +	handle = bl_get_data(bd);
> +	status = cmpc_set_brightness(handle, bd->props.brightness);
> +	if (ACPI_SUCCESS(status))
> +		return 0;
> +	else
> +		return -1;
> +}
> +
> +static struct backlight_ops cmpc_bl_ops = {
> +	.get_brightness = cmpc_bl_get_brightness,
> +	.update_status = cmpc_bl_update_status
> +};
> +
> +static int cmpc_bl_add(struct acpi_device *acpi)
> +{
> +	struct backlight_device *bd;
> +	bd = backlight_device_register("cmpc_bl", &acpi->dev,
> +				       acpi->handle, &cmpc_bl_ops);
> +	bd->props.max_brightness = 7;
> +	dev_set_drvdata(&acpi->dev, bd);
> +	return 0;
> +}
> +
> +static int cmpc_bl_remove(struct acpi_device *acpi, int type)
> +{
> +	struct backlight_device *bd;
> +	bd = dev_get_drvdata(&acpi->dev);
> +	backlight_device_unregister(bd);
> +	return 0;
> +}
> +
> +static const struct acpi_device_id cmpc_device_ids[] = {
> +	{"IPML200", 0},
> +	{"", 0}
> +};
> +MODULE_DEVICE_TABLE(acpi, cmpc_device_ids);
> +
> +static struct acpi_driver cmpc_bl_acpi_driver = {
> +	.name = "cmpc",
> +	.class = "cmpc",
> +	.ids = cmpc_device_ids,
> +	.ops = {
> +		.add = cmpc_bl_add,
> +		.remove = cmpc_bl_remove
> +	}
> +};
> +
> +static bool cmpc_bl_driver_registered;
> +
> +
> +/*
> + * Extra keys code.
> + */
> +static int cmpc_keys_codes[] = {
> +	KEY_UNKNOWN,
> +	KEY_WLAN,
> +	KEY_SWITCHVIDEOMODE,
> +	KEY_BRIGHTNESSDOWN,
> +	KEY_BRIGHTNESSUP,
> +	KEY_VENDOR,
> +	KEY_MAX
> +};
> +
> +static void cmpc_keys_handler(acpi_handle handle, u32 event, void *ctx)
> +{
> +	struct input_dev *inputdev;
> +	int code = KEY_MAX;
> +	if ((event & 0x0F) < ARRAY_SIZE(cmpc_keys_codes))
> +		code = cmpc_keys_codes[event & 0x0F];
> +	inputdev = ctx;
> +	input_report_key(inputdev, code, !(event & 0x10));
> +}
> +
> +static void cmpc_keys_idev_init(struct input_dev *inputdev)
> +{
> +	int i;
> +	set_bit(EV_KEY, inputdev->evbit);
> +	for (i = 0; cmpc_keys_codes[i] != KEY_MAX; i++)
> +		set_bit(cmpc_keys_codes[i], inputdev->keybit);
> +}
> +
> +static int cmpc_keys_add(struct acpi_device *acpi)
> +{
> +	return cmpc_add_acpi_notify_device(acpi, "cmpc_keys",
> +					   cmpc_keys_handler,
> +					   cmpc_keys_idev_init);
> +}
> +
> +static int cmpc_keys_remove(struct acpi_device *acpi, int type)
> +{
> +	return cmpc_remove_acpi_notify_device(acpi, cmpc_keys_handler);
> +}
> +
> +static const struct acpi_device_id cmpc_keys_device_ids[] = {
> +	{"FnBT0000", 0},
> +	{"", 0}
> +};
> +MODULE_DEVICE_TABLE(acpi, cmpc_keys_device_ids);
> +
> +static struct acpi_driver cmpc_keys_acpi_driver = {
> +	.name = "cmpc_keys",
> +	.class = "cmpc_keys",
> +	.ids = cmpc_keys_device_ids,
> +	.ops = {
> +		.add = cmpc_keys_add,
> +		.remove = cmpc_keys_remove
> +	}
> +};
> +
> +static bool cmpc_keys_driver_registered;
> +
> +
> +/*
> + * General init/exit code.
> + */
> +
> +static int cmpc_init(void)
> +{
> +	int result;
> +	result = acpi_bus_register_driver(&cmpc_keys_acpi_driver);
> +	cmpc_keys_driver_registered = !!result;
> +	result = acpi_bus_register_driver(&cmpc_bl_acpi_driver);
> +	cmpc_bl_driver_registered = !!result;
> +	result = acpi_bus_register_driver(&cmpc_tablet_acpi_driver);
> +	cmpc_tablet_driver_registered = !!result;
> +	result = acpi_bus_register_driver(&cmpc_accel_acpi_driver);
> +	cmpc_accel_driver_registered = !!result;
> +	/*
> +	 * Not every CMPC has every ACPI device supported here. So always return
> +	 * success.
> +	 */
> +	return 0;
> +}
> +
> +static void cmpc_exit(void)
> +{
> +	if (cmpc_accel_driver_registered)
> +		acpi_bus_unregister_driver(&cmpc_accel_acpi_driver);
> +	if (cmpc_tablet_driver_registered)
> +		acpi_bus_unregister_driver(&cmpc_tablet_acpi_driver);
> +	if (cmpc_bl_driver_registered)
> +		acpi_bus_unregister_driver(&cmpc_bl_acpi_driver);
> +	if (cmpc_keys_driver_registered)
> +		acpi_bus_unregister_driver(&cmpc_keys_acpi_driver);
> +}
> +
> +module_init(cmpc_init);
> +module_exit(cmpc_exit);


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