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Commit 7fd40029 authored by Henrique de Moraes Holschuh's avatar Henrique de Moraes Holschuh Committed by Len Brown
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ACPI: thinkpad-acpi: use a separate platform device for hwmon and name it (v2) 



Use a separate platform device and driver ("thinkpad_hwmon") to attach
hwmon attributes and class, and add a name attribute of "thinkpad" to
it, which defines the hwmon device name for libsensors4.

This makes thinkpad-acpi compatible with libsensors4 from lm-sensors, and
the platform driver and device split will make it much easier to separate
hwmon functionality into its own module later on.

Signed-off-by: default avatarHenrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 3e5ce914

Documentation/thinkpad-acpi.txt

+19 −6
Original line number Diff line number Diff line
@@ -105,10 +105,15 @@ The version of thinkpad-acpi's sysfs interface is exported by the driver 
as a driver attribute (see below).



Sysfs driver attributes are on the driver's sysfs attribute space,

for 2.6.20 this is /sys/bus/platform/drivers/thinkpad_acpi/.

for 2.6.23 this is /sys/bus/platform/drivers/thinkpad_acpi/ and

/sys/bus/platform/drivers/thinkpad_hwmon/



Sysfs device attributes are on the driver's sysfs attribute space,

for 2.6.20 this is /sys/devices/platform/thinkpad_acpi/.

Sysfs device attributes are on the thinkpad_acpi device sysfs attribute

space, for 2.6.23 this is /sys/devices/platform/thinkpad_acpi/.



Sysfs device attributes for the sensors and fan are on the

thinkpad_hwmon device's sysfs attribute space, but you should locate it

looking for a hwmon device with the name attribute of "thinkpad".



Driver version

--------------
@@ -766,7 +771,7 @@ Temperature sensors 
-------------------



procfs: /proc/acpi/ibm/thermal

sysfs device attributes: (hwmon) temp*_input

sysfs device attributes: (hwmon "thinkpad") temp*_input



Most ThinkPads include six or more separate temperature sensors but only

expose the CPU temperature through the standard ACPI methods.  This
@@ -989,7 +994,9 @@ Fan control and monitoring: fan speed, fan enable/disable 
---------------------------------------------------------



procfs: /proc/acpi/ibm/fan

sysfs device attributes: (hwmon) fan_input, pwm1, pwm1_enable

sysfs device attributes: (hwmon "thinkpad") fan1_input, pwm1,

			  pwm1_enable

sysfs hwmon driver attributes: fan_watchdog



NOTE NOTE NOTE: fan control operations are disabled by default for

safety reasons.  To enable them, the module parameter "fan_control=1"
@@ -1131,7 +1138,7 @@ hwmon device attribute fan1_input: 
	which can take up to two minutes.  May return rubbish on older

	ThinkPads.



driver attribute fan_watchdog:

hwmon driver attribute fan_watchdog:

	Fan safety watchdog timer interval, in seconds.  Minimum is

	1 second, maximum is 120 seconds.  0 disables the watchdog.
@@ -1233,3 +1240,9 @@ Sysfs interface changelog: 
		layer, the radio switch generates input event EV_RADIO,

		and the driver enables hot key handling by default in

		the firmware.



0x020000:	ABI fix: added a separate hwmon platform device and

		driver, which must be located by name (thinkpad)

		and the hwmon class for libsensors4 (lm-sensors 3)

		compatibility.  Moved all hwmon attributes to this

		new platform device.

drivers/misc/thinkpad_acpi.c

+67 −12
Original line number Diff line number Diff line
@@ -22,7 +22,7 @@ 
 */



#define IBM_VERSION "0.16"

#define TPACPI_SYSFS_VERSION 0x010000

#define TPACPI_SYSFS_VERSION 0x020000



/*

 *  Changelog:
@@ -526,6 +526,7 @@ static char *next_cmd(char **cmds) 
 ****************************************************************************/



static struct platform_device *tpacpi_pdev;

static struct platform_device *tpacpi_sensors_pdev;

static struct class_device *tpacpi_hwmon;

static struct input_dev *tpacpi_inputdev;

static struct mutex tpacpi_inputdev_send_mutex;
@@ -553,6 +554,12 @@ static struct platform_driver tpacpi_pdriver = { 
	.resume = tpacpi_resume_handler,

};



static struct platform_driver tpacpi_hwmon_pdriver = {

	.driver = {

		.name = IBM_HWMON_DRVR_NAME,

		.owner = THIS_MODULE,

	},

};



/*************************************************************************

 * thinkpad-acpi driver attributes
@@ -2872,7 +2879,7 @@ static int __init thermal_init(struct ibm_init_struct *iibm) 


	switch(thermal_read_mode) {

	case TPACPI_THERMAL_TPEC_16:

		res = sysfs_create_group(&tpacpi_pdev->dev.kobj,

		res = sysfs_create_group(&tpacpi_sensors_pdev->dev.kobj,

				&thermal_temp_input16_group);

		if (res)

			return res;
@@ -2880,7 +2887,7 @@ static int __init thermal_init(struct ibm_init_struct *iibm) 
	case TPACPI_THERMAL_TPEC_8:

	case TPACPI_THERMAL_ACPI_TMP07:

	case TPACPI_THERMAL_ACPI_UPDT:

		res = sysfs_create_group(&tpacpi_pdev->dev.kobj,

		res = sysfs_create_group(&tpacpi_sensors_pdev->dev.kobj,

				&thermal_temp_input8_group);

		if (res)

			return res;
@@ -2897,13 +2904,13 @@ static void thermal_exit(void) 
{

	switch(thermal_read_mode) {

	case TPACPI_THERMAL_TPEC_16:

		sysfs_remove_group(&tpacpi_pdev->dev.kobj,

		sysfs_remove_group(&tpacpi_sensors_pdev->dev.kobj,

				   &thermal_temp_input16_group);

		break;

	case TPACPI_THERMAL_TPEC_8:

	case TPACPI_THERMAL_ACPI_TMP07:

	case TPACPI_THERMAL_ACPI_UPDT:

		sysfs_remove_group(&tpacpi_pdev->dev.kobj,

		sysfs_remove_group(&tpacpi_sensors_pdev->dev.kobj,

				   &thermal_temp_input16_group);

		break;

	case TPACPI_THERMAL_NONE:
@@ -3686,7 +3693,7 @@ static struct device_attribute dev_attr_fan_fan1_input = 
	__ATTR(fan1_input, S_IRUGO,

		fan_fan1_input_show, NULL);



/* sysfs fan fan_watchdog (driver) ------------------------------------- */

/* sysfs fan fan_watchdog (hwmon driver) ------------------------------- */

static ssize_t fan_fan_watchdog_show(struct device_driver *drv,

				     char *buf)

{
@@ -3828,10 +3835,10 @@ static int __init fan_init(struct ibm_init_struct *iibm) 


	if (fan_status_access_mode != TPACPI_FAN_NONE ||

	    fan_control_access_mode != TPACPI_FAN_WR_NONE) {

		rc = sysfs_create_group(&tpacpi_pdev->dev.kobj,

		rc = sysfs_create_group(&tpacpi_sensors_pdev->dev.kobj,

					 &fan_attr_group);

		if (!(rc < 0))

			rc = driver_create_file(&tpacpi_pdriver.driver,

			rc = driver_create_file(&tpacpi_hwmon_pdriver.driver,

					&driver_attr_fan_watchdog);

		if (rc < 0)

			return rc;
@@ -3914,8 +3921,8 @@ static void fan_exit(void) 
	vdbg_printk(TPACPI_DBG_EXIT, "cancelling any pending fan watchdog tasks\n");



	/* FIXME: can we really do this unconditionally? */

	sysfs_remove_group(&tpacpi_pdev->dev.kobj, &fan_attr_group);

	driver_remove_file(&tpacpi_pdriver.driver, &driver_attr_fan_watchdog);

	sysfs_remove_group(&tpacpi_sensors_pdev->dev.kobj, &fan_attr_group);

	driver_remove_file(&tpacpi_hwmon_pdriver.driver, &driver_attr_fan_watchdog);



	cancel_delayed_work(&fan_watchdog_task);

	flush_scheduled_work();
@@ -4366,6 +4373,19 @@ static struct ibm_struct fan_driver_data = { 
 ****************************************************************************

 ****************************************************************************/



/* sysfs name ---------------------------------------------------------- */

static ssize_t thinkpad_acpi_pdev_name_show(struct device *dev,

			   struct device_attribute *attr,

			   char *buf)

{

	return snprintf(buf, PAGE_SIZE, "%s\n", IBM_NAME);

}



static struct device_attribute dev_attr_thinkpad_acpi_pdev_name =

	__ATTR(name, S_IRUGO, thinkpad_acpi_pdev_name_show, NULL);



/* --------------------------------------------------------------------- */



/* /proc support */

static struct proc_dir_entry *proc_dir;
@@ -4768,12 +4788,20 @@ static int __init thinkpad_acpi_module_init(void) 


	ret = platform_driver_register(&tpacpi_pdriver);

	if (ret) {

		printk(IBM_ERR "unable to register platform driver\n");

		printk(IBM_ERR "unable to register main platform driver\n");

		thinkpad_acpi_module_exit();

		return ret;

	}

	tp_features.platform_drv_registered = 1;



	ret = platform_driver_register(&tpacpi_hwmon_pdriver);

	if (ret) {

		printk(IBM_ERR "unable to register hwmon platform driver\n");

		thinkpad_acpi_module_exit();

		return ret;

	}

	tp_features.sensors_pdrv_registered = 1;



	ret = tpacpi_create_driver_attributes(&tpacpi_pdriver.driver);

	if (ret) {

		printk(IBM_ERR "unable to create sysfs driver attributes\n");
@@ -4793,7 +4821,26 @@ static int __init thinkpad_acpi_module_init(void) 
		thinkpad_acpi_module_exit();

		return ret;

	}

	tpacpi_hwmon = hwmon_device_register(&tpacpi_pdev->dev);

	tpacpi_sensors_pdev = platform_device_register_simple(

							IBM_HWMON_DRVR_NAME,

							-1, NULL, 0);

	if (IS_ERR(tpacpi_sensors_pdev)) {

		ret = PTR_ERR(tpacpi_sensors_pdev);

		tpacpi_sensors_pdev = NULL;

		printk(IBM_ERR "unable to register hwmon platform device\n");

		thinkpad_acpi_module_exit();

		return ret;

	}

	ret = device_create_file(&tpacpi_sensors_pdev->dev,

				 &dev_attr_thinkpad_acpi_pdev_name);

	if (ret) {

		printk(IBM_ERR

			"unable to create sysfs hwmon device attributes\n");

		thinkpad_acpi_module_exit();

		return ret;

	}

	tp_features.sensors_pdev_attrs_registered = 1;

	tpacpi_hwmon = hwmon_device_register(&tpacpi_sensors_pdev->dev);

	if (IS_ERR(tpacpi_hwmon)) {

		ret = PTR_ERR(tpacpi_hwmon);

		tpacpi_hwmon = NULL;
@@ -4864,12 +4911,20 @@ static void thinkpad_acpi_module_exit(void) 
	if (tpacpi_hwmon)

		hwmon_device_unregister(tpacpi_hwmon);



	if (tp_features.sensors_pdev_attrs_registered)

		device_remove_file(&tpacpi_sensors_pdev->dev,

				   &dev_attr_thinkpad_acpi_pdev_name);

	if (tpacpi_sensors_pdev)

		platform_device_unregister(tpacpi_sensors_pdev);

	if (tpacpi_pdev)

		platform_device_unregister(tpacpi_pdev);



	if (tp_features.platform_drv_attrs_registered)

		tpacpi_remove_driver_attributes(&tpacpi_pdriver.driver);



	if (tp_features.sensors_pdrv_registered)

		platform_driver_unregister(&tpacpi_hwmon_pdriver);



	if (tp_features.platform_drv_registered)

		platform_driver_unregister(&tpacpi_pdriver);

drivers/misc/thinkpad_acpi.h

+5 −1
Original line number Diff line number Diff line
@@ -58,13 +58,14 @@ 


#define IBM_NAME "thinkpad"

#define IBM_DESC "ThinkPad ACPI Extras"

#define IBM_FILE "thinkpad_acpi"

#define IBM_FILE IBM_NAME "_acpi"

#define IBM_URL "http://ibm-acpi.sf.net/"

#define IBM_MAIL "ibm-acpi-devel@lists.sourceforge.net"



#define IBM_PROC_DIR "ibm"

#define IBM_ACPI_EVENT_PREFIX "ibm"

#define IBM_DRVR_NAME IBM_FILE

#define IBM_HWMON_DRVR_NAME IBM_NAME "_hwmon"



#define IBM_LOG IBM_FILE ": "

#define IBM_ERR	   KERN_ERR    IBM_LOG
@@ -171,6 +172,7 @@ static int parse_strtoul(const char *buf, unsigned long max, 


/* Device model */

static struct platform_device *tpacpi_pdev;

static struct platform_device *tpacpi_sensors_pdev;

static struct class_device *tpacpi_hwmon;

static struct platform_driver tpacpi_pdriver;

static struct input_dev *tpacpi_inputdev;
@@ -249,6 +251,8 @@ static struct { 
	u32 input_device_registered:1;

	u32 platform_drv_registered:1;

	u32 platform_drv_attrs_registered:1;

	u32 sensors_pdrv_registered:1;

	u32 sensors_pdev_attrs_registered:1;

} tp_features;



struct thinkpad_id_data {