> -----Original Message----- > From: Li Zefan [mailto:lizf@xxxxxxxxxxxxxx] > Sent: Friday, January 18, 2008 9:25 AM > To: Zhang, Rui > Cc: Randy Dunlap; sam@xxxxxxxxxxxx; lenb@xxxxxxxxxx; linux- > acpi@xxxxxxxxxxxxxxx; linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx; Thomas, Sujith > Subject: Re: [PATCH 9/10] introduce intel_menlow platform specific driver > > Zhang Rui 写道: > > Hi, Randy and Sam, > > > >>> + if (result) > >>> + goto end;acpi_bus_get_private_data > >>> + } > >>> + > >>> + end: > > Hah, Lindent always does this for me, > >> Labels should begin in column 0 or 1. Only. > > yes, and checkpatch.pl begins to complain about this > > after using Lindent... > > I think we should change one of them, :) > > > >>> + return result; > >>> +} > >>> + > >>> + > >>> +const static struct acpi_device_id intel_menlow_memory_ids[] = { > >>> + {"INT0002", 0}, > >>> + {"", 0}, > >> or just {} for the terminating entry, right? > > Yes, I use this just to be consistent with other ACPI device drivers. > > > > Thanks for your comments, please review the patch below, > > > > From: Thomas Sujith <sujith.thomas@xxxxxxxxx> > > > > Intel menlow platform specific driver for thermal management extension. > > > > Signed-off-by: Thomas Sujith <sujith.thomas@xxxxxxxxx> > > Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx> > > --- > > drivers/misc/Kconfig | 9 > > drivers/misc/Makefile | 1 > > drivers/misc/intel_menlow.c | 520 > ++++++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 530 insertions(+) > > > > Index: linux-2.6/drivers/misc/intel_menlow.c > > =================================================================== > > --- /dev/null > > +++ linux-2.6/drivers/misc/intel_menlow.c > > @@ -0,0 +1,520 @@ > > +/* > > +* intel_menlow.c - Intel menlow Driver for thermal management > extension > > +* > > +* Copyright (C) 2008 Intel Corp > > +* Copyright (C) 2008 Sujith Thomas <sujith.thomas@xxxxxxxxx> > > +* Copyright (C) 2008 Zhang Rui <rui.zhang@xxxxxxxxx> > > +* > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > +* > > +* 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; version 2 of the License. > > +* > > +* 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., > > +* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. > > +* > > +* > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > +* > > +* This driver creates the sys I/F for programming the sensors. > > +* It also implements the driver for intel menlow memory controller > (hardware > > +* id is INT0002) which makes use of the platform specific ACPI methods > > +* to get/set bandwidth. > > +*/ > > + > > +#include <linux/kernel.h> > > +#include <linux/module.h> > > +#include <linux/init.h> > > +#include <linux/types.h> > > +#include <linux/pci.h> > > +#include <linux/pm.h> > > + > > +#include <linux/thermal.h> > > +#include <acpi/acpi_bus.h> > > +#include <acpi/acpi_drivers.h> > > + > > +MODULE_AUTHOR("Thomas Sujith"); > > +MODULE_AUTHOR("Zhang Rui"); > > +MODULE_DESCRIPTION("Intel Menlow platform specific driver"); > > +MODULE_LICENSE("GPL"); > > + > > +/* > > + * Memory controller device control > > + */ > > + > > +#define MEMORY_GET_BANDWIDTH "GTHS" > > +#define MEMORY_SET_BANDWIDTH "STHS" > > +#define MEMORY_ARG_CUR_BANDWIDTH 1 > > +#define MEMORY_ARG_MAX_BANDWIDTH 0 > > + > > +static int memory_get_int_max_bandwidth(struct thermal_cooling_device > *cdev, > > + unsigned long *max_state) > > +{ > > + struct acpi_device *device = cdev->devdata; > > + acpi_handle handle = device->handle; > > + unsigned long value; > > + struct acpi_object_list arg_list; > > + union acpi_object arg; > > + acpi_status status = AE_OK; > > + > > + arg_list.count = 1; > > + arg_list.pointer = &arg; > > + arg.type = ACPI_TYPE_INTEGER; > > + arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH; > > + status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH, > > + &arg_list, &value); > > + if (ACPI_FAILURE(status)) > > + return -EFAULT; > > + > > + *max_state = value - 1; > > + return 0; > > +} > > + > > +static int memory_get_max_bandwidth(struct thermal_cooling_device > *cdev, > > + char *buf) > > +{ > > + unsigned long value; > > + if (memory_get_int_max_bandwidth(cdev, &value)) > > + return -EINVAL; > > + > > + return sprintf(buf, "%ld\n", value); > > +} > > + > > <...> > > > +static int memory_get_cur_bandwidth(struct thermal_cooling_device > *cdev, > > + char *buf) > > +{ > > + struct acpi_device *device = cdev->devdata; > > + acpi_handle handle = device->handle; > > + unsigned long value; > > + struct acpi_object_list arg_list; > > + union acpi_object arg; > > + acpi_status status = AE_OK; > > + > > + arg_list.count = 1; > > + arg_list.pointer = &arg; > > + arg.type = ACPI_TYPE_INTEGER; > > + arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH; > > + status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH, > > + &arg_list, &value); > > + if (ACPI_FAILURE(status)) > > + return -EFAULT; > > + > > + return sprintf(buf, "%ld\n", value); > > +} > > + > > +static int memory_set_cur_bandwidth(struct thermal_cooling_device > *cdev, > > + unsigned int state) > > +{ > > + struct acpi_device *device = cdev->devdata; > > + acpi_handle handle = device->handle; > > + struct acpi_object_list arg_list; > > + union acpi_object arg; > > + acpi_status status; > > + int temp; > > + unsigned long max_state; > > + > > + if (memory_get_int_max_bandwidth(cdev, &max_state)) > > + return -EFAULT; > > + > > + if (max_state < 0 || state > max_state) > > + return -EINVAL; > > + > > + arg_list.count = 1; > > + arg_list.pointer = &arg; > > + arg.type = ACPI_TYPE_INTEGER; > > + arg.integer.value = state; > > + > > + status = > > + acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list, > > + (unsigned long *)&temp); > > + > > + printk(KERN_INFO > > + "Bandwidth value was %d: status is %d\n", state, status); > > + if (ACPI_FAILURE(status)) > > + return -EFAULT; > > + > > + return 0; > > +} > > + > > +static struct thermal_cooling_device_ops memory_cooling_ops = { > > + .get_max_state = memory_get_max_bandwidth, > > + .get_cur_state = memory_get_cur_bandwidth, > > + .set_cur_state = memory_set_cur_bandwidth, > > +}; > > + > > <...> > > > +/* > > + * Memory Device Management > > + */ > > +static int intel_menlow_memory_add(struct acpi_device *device) > > +{ > > + int result = -ENODEV; > > + acpi_status status = AE_OK; > > + acpi_handle dummy; > > + struct thermal_cooling_device *cdev; > > + > > + if (!device) > > + return -EINVAL; > > + > > + status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, > &dummy); > > + if (ACPI_FAILURE(status)) > > + goto end; > > + > > + status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, > &dummy); > > + if (ACPI_FAILURE(status)) > > + goto end; > > + > > + cdev = thermal_cooling_device_register("Memory controller", device, > > + &memory_cooling_ops); > > + acpi_driver_data(device) = cdev; > > + if (!cdev) > > + result = -ENODEV; > > + else { > > + result = > > + sysfs_create_link(&device->dev.kobj, &cdev->device.kobj, > > + "thermal_cooling"); > > + if (result) > > + goto end; > > + result = > > + sysfs_create_link(&cdev->device.kobj, &device->dev.kobj, > > + "device"); > > + if (result) > > + goto end; > > This if condition is needless. I agree. This will be taken care of. > > > + } > > + > > + end: > > + return result; > > No need to call thermal_cooling_device_unregister() and > sysfs_remove_link() in > some error routines ? Yes, I agree. We need to call those on error routines > > > +} > > + > > +static int intel_menlow_memory_remove(struct acpi_device *device, int > type) > > +{ > > + struct thermal_cooling_device *cdev = acpi_driver_data(device); > > + > > + if (!device || !cdev) > > + return -EINVAL; > > + > > + sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); > > + sysfs_remove_link(&cdev->device.kobj, "device"); > > + thermal_cooling_device_unregister(cdev); > > + > > + return 0; > > +} > > + > > +const static struct acpi_device_id intel_menlow_memory_ids[] = { > > + {"INT0002", 0}, > > + {"", 0}, > > +}; > > + > > +static struct acpi_driver intel_menlow_memory_driver = { > > + .name = "intel_menlow_thermal_control", > > + .ids = intel_menlow_memory_ids, > > + .ops = { > > + .add = intel_menlow_memory_add, > > + .remove = intel_menlow_memory_remove, > > + }, > > +}; > > + > > +/* > > + * Sensor control on menlow platform > > + */ > > + > > +#define THERMAL_AUX0 0 > > +#define THERMAL_AUX1 1 > > +#define GET_AUX0 "GAX0" > > +#define GET_AUX1 "GAX1" > > +#define SET_AUX0 "SAX0" > > +#define SET_AUX1 "SAX1" > > + > > +struct intel_menlow_attribute { > > + struct device_attribute attr; > > + struct device *device; > > + acpi_handle handle; > > + struct list_head node; > > +}; > > + > > +static LIST_HEAD(intel_menlow_attr_list); > > +static DEFINE_MUTEX(intel_menlow_attr_lock); > > + > > +/* > > + * sensor_get_auxtrip - get the current auxtrip value from sensor > > + * @name: Thermalzone name > > + * @auxtype : AUX0/AUX1 > > + * @buf: syfs buffer > > + */ > > +static int sensor_get_auxtrip(acpi_handle handle, int index, int > *value) > > +{ > > + acpi_status status; > > + > > + if ((index != 0 && index != 1) || !value) > > + return -EINVAL; > > + > > + status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0, > > + NULL, (unsigned long *)value); > > + if (ACPI_FAILURE(status)) > > + return -EIO; > > + > > + return 0; > > +} > > + > > <...> > > > +/* > > + * sensor_set_auxtrip - set the new auxtrip value to sensor > > + * @name: Thermalzone name > > + * @auxtype : AUX0/AUX1 > > + * @buf: syfs buffer > > + */ > > +static int sensor_set_auxtrip(acpi_handle handle, int index, int value) > > +{ > > + acpi_status status; > > + union acpi_object arg = { > > + ACPI_TYPE_INTEGER > > + }; > > + struct acpi_object_list args = { > > + 1, &arg > > + }; > > + int temp; > > + > > + if (index != 0 && index != 1) > > + return -EINVAL; > > + > > + status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1, > > + NULL, (unsigned long *)&temp); > > + if (ACPI_FAILURE(status)) > > + return -EIO; > > + if ((index && value < temp) || (!index && value > temp)) > > + return -EINVAL; > > + > > + arg.integer.value = value; > > + status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0, > > + &args, (unsigned long *)&temp); > > + if (ACPI_FAILURE(status)) > > + return -EIO; > > + > > + /* do we need to check the return value of SAX0/SAX1 ? */ > > + > > + return 0; > > +} > > + > > +#define to_intel_menlow_attr(_attr) \ > > + container_of(_attr, struct intel_menlow_attribute, attr) > > + > > +static ssize_t aux0_show(struct device *dev, > > + struct device_attribute *dev_attr, char *buf) > > +{ > > + struct intel_menlow_attribute *attr = > to_intel_menlow_attr(dev_attr); > > + int value; > > + int result; > > + > > + result = sensor_get_auxtrip(attr->handle, 0, &value); > > + > > + return result ? result : sprintf(buf, "%lu", > KELVIN_TO_CELSIUS(value)); > > +} > > + > > +static ssize_t aux1_show(struct device *dev, > > + struct device_attribute *dev_attr, char *buf) > > +{ > > + struct intel_menlow_attribute *attr = > to_intel_menlow_attr(dev_attr); > > + int value; > > + int result; > > + > > + result = sensor_get_auxtrip(attr->handle, 1, &value); > > + > > + return result ? result : sprintf(buf, "%lu", > KELVIN_TO_CELSIUS(value)); > > +} > > + > > +static ssize_t aux0_store(struct device *dev, > > + struct device_attribute *dev_attr, > > + const char *buf, size_t count) > > +{ > > + struct intel_menlow_attribute *attr = > to_intel_menlow_attr(dev_attr); > > + int value; > > + int result; > > + > > + /*Sanity check; should be a positive integer */ > > + if (!sscanf(buf, "%d", &value)) > > + return -EINVAL; > > + > > + if (value < 0) > > + return -EINVAL; > > + > > + result = sensor_set_auxtrip(attr->handle, 0, > CELSIUS_TO_KELVIN(value)); > > + return result ? result : count; > > +} > > + > > <...> > > > +static ssize_t aux1_store(struct device *dev, > > + struct device_attribute *dev_attr, > > + const char *buf, size_t count) > > +{ > > + struct intel_menlow_attribute *attr = > to_intel_menlow_attr(dev_attr); > > + int value; > > + int result; > > + > > + /*Sanity check; should be a positive integer */ > > + if (!sscanf(buf, "%d", &value)) > > + return -EINVAL; > > + > > + if (value < 0) > > + return -EINVAL; > > + > > + result = sensor_set_auxtrip(attr->handle, 1, > CELSIUS_TO_KELVIN(value)); > > + return result ? result : count; > > +} > > + > > +/* BIOS can enable/disable the thermal user application in dabney > platform */ > > +#define BIOS_ENABLED "\\_TZ.GSTS" > > +static ssize_t bios_enabled_show(struct device *dev, > > + struct device_attribute *attr, char *buf) > > +{ > > + acpi_status status; > > + unsigned long bios_enabled; > > + > > + status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, > &bios_enabled); > > + if (ACPI_FAILURE(status)) > > + return -ENODEV; > > + > > + return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled"); > > +} > > + > > +static int intel_menlow_add_one_attribute(char *name, int mode, void > *show, > > + void *store, struct device *dev, > > + acpi_handle handle) > > +{ > > + struct intel_menlow_attribute *attr; > > + int result; > > + > > + attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL); > > + if (!attr) > > + return -ENOMEM; > > + > > + attr->attr.attr.name = name; > > + attr->attr.attr.mode = mode; > > + attr->attr.show = show; > > + attr->attr.store = store; > > + attr->device = dev; > > + attr->handle = handle; > > + > > + result = device_create_file(dev, &attr->attr); > > + if (result) > > + return result; > > + > > + mutex_lock(&intel_menlow_attr_lock); > > + list_add_tail(&attr->node, &intel_menlow_attr_list); > > + mutex_unlock(&intel_menlow_attr_lock); > > + > > + return 0; > > +} > > + > > <...> > > > +static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 > lvl, > > + void *context, void **rv) > > +{ > > + acpi_status status; > > + acpi_handle dummy; > > + struct thermal_zone_device *thermal; > > + int result; > > + > > + result = acpi_bus_get_private_data(handle, (void **)&thermal); > > + if (result) > > + return 0; > > + > > + /* _TZ must have the AUX0/1 methods */ > > + status = acpi_get_handle(handle, GET_AUX0, &dummy); > > + if (ACPI_FAILURE(status)) > > + goto not_found; > > + > > + status = acpi_get_handle(handle, SET_AUX0, &dummy); > > + if (ACPI_FAILURE(status)) > > + goto not_found; > > + > > + result = intel_menlow_add_one_attribute("aux0", 0644, > > + aux0_show, aux0_store, > > + &thermal->device, handle); > > + if (result) > > + return AE_ERROR; > > + > > + status = acpi_get_handle(handle, GET_AUX1, &dummy); > > + if (ACPI_FAILURE(status)) > > + goto not_found; > > + > > + status = acpi_get_handle(handle, SET_AUX1, &dummy); > > + if (ACPI_FAILURE(status)) > > + goto not_found; > > + > > + result = intel_menlow_add_one_attribute("aux1", 0644, > > + aux1_show, aux1_store, > > + &thermal->device, handle); > > + if (result) > > + return AE_ERROR; > > + > > + /* > > + * create the "dabney_enabled" attribute which means the user app > > + * should be loaded or not > > + */ > > + > > + result = intel_menlow_add_one_attribute("bios_enabled", 0444, > > + bios_enabled_show, NULL, > > + &thermal->device, handle); > > + if (result) > > + return AE_ERROR; > > + > > + not_found: > > + if (status == AE_NOT_FOUND) > > + return AE_OK; > > + else > > + return status; > > +} > > + > > +static void intel_menlow_unregister_sensor(void) > > +{ > > + struct intel_menlow_attribute *pos, *next; > > + > > + mutex_lock(&intel_menlow_attr_lock); > > + list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) { > > + list_del(&pos->node); > > + device_remove_file(pos->device, &pos->attr); > > + kfree(pos); > > + } > > + mutex_unlock(&intel_menlow_attr_lock); > > + > > + return; > > +} > > + > > +static int __init intel_menlow_module_init(void) > > +{ > > + int result = -ENODEV; > > + acpi_status status; > > + unsigned long enable; > > + > > + if (acpi_disabled) > > + return result; > > + > > + /* Looking for the \_TZ.GSTS method */ > > + status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable); > > + if (ACPI_FAILURE(status) || !enable) > > + return -ENODEV; > > + > > + /* Looking for ACPI device MEM0 with hardware id INT0002 */ > > + result = acpi_bus_register_driver(&intel_menlow_memory_driver); > > + if (result) > > + return result; > > + > > + /* Looking for sensors in each ACPI thermal zone */ > > + status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT, > > + ACPI_UINT32_MAX, > > + intel_menlow_register_sensor, NULL, NULL); > > + if (ACPI_FAILURE(status)) > > + result = -ENODEV; > > + > > It seems to me this should be 'return -ENODEV;' > > You can just eliminate variable result, because result will be > -ENODEV only. I disagree. "result" is required to store the return value from acpi_bus_register_driver which may be different from ENODEV. Otherwise it's all -ENODEV. :-Sujith > > > + return 0; > > +} > > + > > +static void __exit intel_menlow_module_exit(void) > > +{ > > + acpi_bus_unregister_driver(&intel_menlow_memory_driver); > > + intel_menlow_unregister_sensor(); > > +} > > + > > +module_init(intel_menlow_module_init); > > +module_exit(intel_menlow_module_exit); > > Index: linux-2.6/drivers/misc/Kconfig > > =================================================================== > > --- linux-2.6.orig/drivers/misc/Kconfig > > +++ linux-2.6/drivers/misc/Kconfig > > @@ -232,4 +232,13 @@ config ATMEL_SSC > > > > If unsure, say N. > > > > +config INTEL_MENLOW > > + tristate "Thermal Management driver for Intel menlow platform" > > + depends on ACPI_THERMAL > > + ---help--- > > + ACPI thermal management enhancement driver on > > + Intel Menlow platform. > > + > > + If unsure, say N. > > + > > endif # MISC_DEVICES > > Index: linux-2.6/drivers/misc/Makefile > > =================================================================== > > --- linux-2.6.orig/drivers/misc/Makefile > > +++ linux-2.6/drivers/misc/Makefile > > @@ -17,3 +17,4 @@ obj-$(CONFIG_SONY_LAPTOP) += sony-laptop > > obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o > > obj-$(CONFIG_FUJITSU_LAPTOP) += fujitsu-laptop.o > > obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o > > +obj-$(CONFIG_INTEL_MENLOW) += intel_menlow.o > > > > _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
