diff options
Diffstat (limited to 'drivers/thermal')
| -rw-r--r-- | drivers/thermal/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/thermal/Makefile | 1 | ||||
| -rw-r--r-- | drivers/thermal/spear_thermal.c | 206 | ||||
| -rw-r--r-- | drivers/thermal/thermal_sys.c | 94 |
4 files changed, 254 insertions, 55 deletions
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index f7f71b2d3101..514a691abea0 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -18,3 +18,11 @@ config THERMAL_HWMON depends on THERMAL depends on HWMON=y || HWMON=THERMAL default y + +config SPEAR_THERMAL + bool "SPEAr thermal sensor driver" + depends on THERMAL + depends on PLAT_SPEAR + help + Enable this to plug the SPEAr thermal sensor driver into the Linux + thermal framework diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 31108a01c22e..a9fff0bf4b14 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -3,3 +3,4 @@ # obj-$(CONFIG_THERMAL) += thermal_sys.o +obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
\ No newline at end of file diff --git a/drivers/thermal/spear_thermal.c b/drivers/thermal/spear_thermal.c new file mode 100644 index 000000000000..c2e32df3b164 --- /dev/null +++ b/drivers/thermal/spear_thermal.c @@ -0,0 +1,206 @@ +/* + * SPEAr thermal driver. + * + * Copyright (C) 2011-2012 ST Microelectronics + * Author: Vincenzo Frascino <vincenzo.frascino@st.com> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + * + */ + +#include <linux/clk.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/platform_data/spear_thermal.h> +#include <linux/thermal.h> + +#define MD_FACTOR 1000 + +/* SPEAr Thermal Sensor Dev Structure */ +struct spear_thermal_dev { + /* pointer to base address of the thermal sensor */ + void __iomem *thermal_base; + /* clk structure */ + struct clk *clk; + /* pointer to thermal flags */ + unsigned int flags; +}; + +static inline int thermal_get_temp(struct thermal_zone_device *thermal, + unsigned long *temp) +{ + struct spear_thermal_dev *stdev = thermal->devdata; + + /* + * Data are ready to be read after 628 usec from POWERDOWN signal + * (PDN) = 1 + */ + *temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR; + return 0; +} + +static struct thermal_zone_device_ops ops = { + .get_temp = thermal_get_temp, +}; + +#ifdef CONFIG_PM +static int spear_thermal_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev); + struct spear_thermal_dev *stdev = spear_thermal->devdata; + unsigned int actual_mask = 0; + + /* Disable SPEAr Thermal Sensor */ + actual_mask = readl_relaxed(stdev->thermal_base); + writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base); + + clk_disable(stdev->clk); + dev_info(dev, "Suspended.\n"); + + return 0; +} + +static int spear_thermal_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev); + struct spear_thermal_dev *stdev = spear_thermal->devdata; + unsigned int actual_mask = 0; + int ret = 0; + + ret = clk_enable(stdev->clk); + if (ret) { + dev_err(&pdev->dev, "Can't enable clock\n"); + return ret; + } + + /* Enable SPEAr Thermal Sensor */ + actual_mask = readl_relaxed(stdev->thermal_base); + writel_relaxed(actual_mask | stdev->flags, stdev->thermal_base); + + dev_info(dev, "Resumed.\n"); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(spear_thermal_pm_ops, spear_thermal_suspend, + spear_thermal_resume); + +static int spear_thermal_probe(struct platform_device *pdev) +{ + struct thermal_zone_device *spear_thermal = NULL; + struct spear_thermal_dev *stdev; + struct spear_thermal_pdata *pdata; + int ret = 0; + struct resource *stres = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + if (!stres) { + dev_err(&pdev->dev, "memory resource missing\n"); + return -ENODEV; + } + + pdata = dev_get_platdata(&pdev->dev); + if (!pdata) { + dev_err(&pdev->dev, "platform data is NULL\n"); + return -EINVAL; + } + + stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL); + if (!stdev) { + dev_err(&pdev->dev, "kzalloc fail\n"); + return -ENOMEM; + } + + /* Enable thermal sensor */ + stdev->thermal_base = devm_ioremap(&pdev->dev, stres->start, + resource_size(stres)); + if (!stdev->thermal_base) { + dev_err(&pdev->dev, "ioremap failed\n"); + return -ENOMEM; + } + + stdev->clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(stdev->clk)) { + dev_err(&pdev->dev, "Can't get clock\n"); + return PTR_ERR(stdev->clk); + } + + ret = clk_enable(stdev->clk); + if (ret) { + dev_err(&pdev->dev, "Can't enable clock\n"); + goto put_clk; + } + + stdev->flags = pdata->thermal_flags; + writel_relaxed(stdev->flags, stdev->thermal_base); + + spear_thermal = thermal_zone_device_register("spear_thermal", 0, + stdev, &ops, 0, 0, 0, 0); + if (IS_ERR(spear_thermal)) { + dev_err(&pdev->dev, "thermal zone device is NULL\n"); + ret = PTR_ERR(spear_thermal); + goto disable_clk; + } + + platform_set_drvdata(pdev, spear_thermal); + + dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n", + stdev->thermal_base); + + return 0; + +disable_clk: + clk_disable(stdev->clk); +put_clk: + clk_put(stdev->clk); + + return ret; +} + +static int spear_thermal_exit(struct platform_device *pdev) +{ + unsigned int actual_mask = 0; + struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev); + struct spear_thermal_dev *stdev = spear_thermal->devdata; + + thermal_zone_device_unregister(spear_thermal); + platform_set_drvdata(pdev, NULL); + + /* Disable SPEAr Thermal Sensor */ + actual_mask = readl_relaxed(stdev->thermal_base); + writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base); + + clk_disable(stdev->clk); + clk_put(stdev->clk); + + return 0; +} + +static struct platform_driver spear_thermal_driver = { + .probe = spear_thermal_probe, + .remove = spear_thermal_exit, + .driver = { + .name = "spear_thermal", + .owner = THIS_MODULE, + .pm = &spear_thermal_pm_ops, + }, +}; + +module_platform_driver(spear_thermal_driver); + +MODULE_AUTHOR("Vincenzo Frascino <vincenzo.frascino@st.com>"); +MODULE_DESCRIPTION("SPEAr thermal driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 220ce7e31cf5..022bacb71a7e 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -23,6 +23,8 @@ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + #include <linux/module.h> #include <linux/device.h> #include <linux/err.h> @@ -39,8 +41,6 @@ MODULE_AUTHOR("Zhang Rui"); MODULE_DESCRIPTION("Generic thermal management sysfs support"); MODULE_LICENSE("GPL"); -#define PREFIX "Thermal: " - struct thermal_cooling_device_instance { int id; char name[THERMAL_NAME_LENGTH]; @@ -60,13 +60,11 @@ static LIST_HEAD(thermal_tz_list); static LIST_HEAD(thermal_cdev_list); static DEFINE_MUTEX(thermal_list_lock); -static unsigned int thermal_event_seqnum; - static int get_idr(struct idr *idr, struct mutex *lock, int *id) { int err; - again: +again: if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0)) return -ENOMEM; @@ -152,9 +150,9 @@ mode_store(struct device *dev, struct device_attribute *attr, if (!tz->ops->set_mode) return -EPERM; - if (!strncmp(buf, "enabled", sizeof("enabled"))) + if (!strncmp(buf, "enabled", sizeof("enabled") - 1)) result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED); - else if (!strncmp(buf, "disabled", sizeof("disabled"))) + else if (!strncmp(buf, "disabled", sizeof("disabled") - 1)) result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED); else result = -EINVAL; @@ -283,8 +281,7 @@ passive_show(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR(type, 0444, type_show, NULL); static DEVICE_ATTR(temp, 0444, temp_show, NULL); static DEVICE_ATTR(mode, 0644, mode_show, mode_store); -static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \ - passive_store); +static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store); static struct device_attribute trip_point_attrs[] = { __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL), @@ -313,22 +310,6 @@ static struct device_attribute trip_point_attrs[] = { __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL), }; -#define TRIP_POINT_ATTR_ADD(_dev, _index, result) \ -do { \ - result = device_create_file(_dev, \ - &trip_point_attrs[_index * 2]); \ - if (result) \ - break; \ - result = device_create_file(_dev, \ - &trip_point_attrs[_index * 2 + 1]); \ -} while (0) - -#define TRIP_POINT_ATTR_REMOVE(_dev, _index) \ -do { \ - device_remove_file(_dev, &trip_point_attrs[_index * 2]); \ - device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \ -} while (0) - /* sys I/F for cooling device */ #define to_cooling_device(_dev) \ container_of(_dev, struct thermal_cooling_device, device) @@ -835,15 +816,14 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, return 0; device_remove_file(&tz->device, &dev->attr); - remove_symbol_link: +remove_symbol_link: sysfs_remove_link(&tz->device.kobj, dev->name); - release_idr: +release_idr: release_idr(&tz->idr, &tz->lock, dev->id); - free_mem: +free_mem: kfree(dev); return result; } - EXPORT_SYMBOL(thermal_zone_bind_cooling_device); /** @@ -873,14 +853,13 @@ int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz, return -ENODEV; - unbind: +unbind: device_remove_file(&tz->device, &pos->attr); sysfs_remove_link(&tz->device.kobj, pos->name); release_idr(&tz->idr, &tz->lock, pos->id); kfree(pos); return 0; } - EXPORT_SYMBOL(thermal_zone_unbind_cooling_device); static void thermal_release(struct device *dev) @@ -888,7 +867,8 @@ static void thermal_release(struct device *dev) struct thermal_zone_device *tz; struct thermal_cooling_device *cdev; - if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) { + if (!strncmp(dev_name(dev), "thermal_zone", + sizeof("thermal_zone") - 1)) { tz = to_thermal_zone(dev); kfree(tz); } else { @@ -908,8 +888,9 @@ static struct class thermal_class = { * @devdata: device private data. * @ops: standard thermal cooling devices callbacks. */ -struct thermal_cooling_device *thermal_cooling_device_register( - char *type, void *devdata, const struct thermal_cooling_device_ops *ops) +struct thermal_cooling_device * +thermal_cooling_device_register(char *type, void *devdata, + const struct thermal_cooling_device_ops *ops) { struct thermal_cooling_device *cdev; struct thermal_zone_device *pos; @@ -974,12 +955,11 @@ struct thermal_cooling_device *thermal_cooling_device_register( if (!result) return cdev; - unregister: +unregister: release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); device_unregister(&cdev->device); return ERR_PTR(result); } - EXPORT_SYMBOL(thermal_cooling_device_register); /** @@ -1024,7 +1004,6 @@ void thermal_cooling_device_unregister(struct device_unregister(&cdev->device); return; } - EXPORT_SYMBOL(thermal_cooling_device_unregister); /** @@ -1044,8 +1023,7 @@ void thermal_zone_device_update(struct thermal_zone_device *tz) if (tz->ops->get_temp(tz, &temp)) { /* get_temp failed - retry it later */ - printk(KERN_WARNING PREFIX "failed to read out thermal zone " - "%d\n", tz->id); + pr_warn("failed to read out thermal zone %d\n", tz->id); goto leave; } @@ -1060,9 +1038,8 @@ void thermal_zone_device_update(struct thermal_zone_device *tz) ret = tz->ops->notify(tz, count, trip_type); if (!ret) { - printk(KERN_EMERG - "Critical temperature reached (%ld C), shutting down.\n", - temp/1000); + pr_emerg("Critical temperature reached (%ld C), shutting down\n", + temp/1000); orderly_poweroff(true); } } @@ -1100,7 +1077,7 @@ void thermal_zone_device_update(struct thermal_zone_device *tz) tz->last_temperature = temp; - leave: +leave: if (tz->passive) thermal_zone_device_set_polling(tz, tz->passive_delay); else if (tz->polling_delay) @@ -1199,7 +1176,12 @@ struct thermal_zone_device *thermal_zone_device_register(char *type, } for (count = 0; count < trips; count++) { - TRIP_POINT_ATTR_ADD(&tz->device, count, result); + result = device_create_file(&tz->device, + &trip_point_attrs[count * 2]); + if (result) + break; + result = device_create_file(&tz->device, + &trip_point_attrs[count * 2 + 1]); if (result) goto unregister; tz->ops->get_trip_type(tz, count, &trip_type); @@ -1235,12 +1217,11 @@ struct thermal_zone_device *thermal_zone_device_register(char *type, if (!result) return tz; - unregister: +unregister: release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); device_unregister(&tz->device); return ERR_PTR(result); } - EXPORT_SYMBOL(thermal_zone_device_register); /** @@ -1279,9 +1260,12 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) if (tz->ops->get_mode) device_remove_file(&tz->device, &dev_attr_mode); - for (count = 0; count < tz->trips; count++) - TRIP_POINT_ATTR_REMOVE(&tz->device, count); - + for (count = 0; count < tz->trips; count++) { + device_remove_file(&tz->device, + &trip_point_attrs[count * 2]); + device_remove_file(&tz->device, + &trip_point_attrs[count * 2 + 1]); + } thermal_remove_hwmon_sysfs(tz); release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); idr_destroy(&tz->idr); @@ -1289,7 +1273,6 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) device_unregister(&tz->device); return; } - EXPORT_SYMBOL(thermal_zone_device_unregister); #ifdef CONFIG_NET @@ -1312,10 +1295,11 @@ int thermal_generate_netlink_event(u32 orig, enum events event) void *msg_header; int size; int result; + static unsigned int thermal_event_seqnum; /* allocate memory */ - size = nla_total_size(sizeof(struct thermal_genl_event)) + \ - nla_total_size(0); + size = nla_total_size(sizeof(struct thermal_genl_event)) + + nla_total_size(0); skb = genlmsg_new(size, GFP_ATOMIC); if (!skb) @@ -1331,8 +1315,8 @@ int thermal_generate_netlink_event(u32 orig, enum events event) } /* fill the data */ - attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \ - sizeof(struct thermal_genl_event)); + attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, + sizeof(struct thermal_genl_event)); if (!attr) { nlmsg_free(skb); @@ -1359,7 +1343,7 @@ int thermal_generate_netlink_event(u32 orig, enum events event) result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC); if (result) - printk(KERN_INFO "failed to send netlink event:%d", result); + pr_info("failed to send netlink event:%d\n", result); return result; } |