/* * linux/drivers/video/backlight/aat2870_bl.c * * Copyright (c) 2011, NVIDIA Corporation. * Author: Jin Park * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * 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 St, Fifth Floor, Boston, MA * 02110-1301 USA */ #include #include #include #include #include #include #include #include #include struct aat2870_bl_driver_data { struct platform_device *pdev; struct backlight_device *bd; int channels; int max_current; int brightness; /* current brightness */ }; static inline int aat2870_brightness(struct aat2870_bl_driver_data *aat2870_bl, int brightness) { struct backlight_device *bd = aat2870_bl->bd; int val; val = brightness * (aat2870_bl->max_current - 1); val /= bd->props.max_brightness; return val; } static inline int aat2870_bl_enable(struct aat2870_bl_driver_data *aat2870_bl) { struct aat2870_data *aat2870 = dev_get_drvdata(aat2870_bl->pdev->dev.parent); return aat2870->write(aat2870, AAT2870_BL_CH_EN, (u8)aat2870_bl->channels); } static inline int aat2870_bl_disable(struct aat2870_bl_driver_data *aat2870_bl) { struct aat2870_data *aat2870 = dev_get_drvdata(aat2870_bl->pdev->dev.parent); return aat2870->write(aat2870, AAT2870_BL_CH_EN, 0x0); } static int aat2870_bl_update_status(struct backlight_device *bd) { struct aat2870_bl_driver_data *aat2870_bl = bl_get_data(bd); struct aat2870_data *aat2870 = dev_get_drvdata(aat2870_bl->pdev->dev.parent); int brightness = bd->props.brightness; int ret; if ((brightness < 0) || (bd->props.max_brightness < brightness)) { dev_err(&bd->dev, "invalid brightness, %d\n", brightness); return -EINVAL; } dev_dbg(&bd->dev, "brightness=%d, power=%d, state=%d\n", bd->props.brightness, bd->props.power, bd->props.state); if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.state & BL_CORE_FBBLANK) || (bd->props.state & BL_CORE_SUSPENDED)) brightness = 0; ret = aat2870->write(aat2870, AAT2870_BLM, (u8)aat2870_brightness(aat2870_bl, brightness)); if (ret < 0) return ret; if (brightness == 0) { ret = aat2870_bl_disable(aat2870_bl); if (ret < 0) return ret; } else if (aat2870_bl->brightness == 0) { ret = aat2870_bl_enable(aat2870_bl); if (ret < 0) return ret; } aat2870_bl->brightness = brightness; return 0; } static int aat2870_bl_check_fb(struct backlight_device *bd, struct fb_info *fi) { return 1; } static const struct backlight_ops aat2870_bl_ops = { .options = BL_CORE_SUSPENDRESUME, .update_status = aat2870_bl_update_status, .check_fb = aat2870_bl_check_fb, }; static int aat2870_bl_probe(struct platform_device *pdev) { struct aat2870_bl_platform_data *pdata = dev_get_platdata(&pdev->dev); struct aat2870_bl_driver_data *aat2870_bl; struct backlight_device *bd; struct backlight_properties props; int ret = 0; if (!pdata) { dev_err(&pdev->dev, "No platform data\n"); ret = -ENXIO; goto out; } if (pdev->id != AAT2870_ID_BL) { dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id); ret = -EINVAL; goto out; } aat2870_bl = devm_kzalloc(&pdev->dev, sizeof(struct aat2870_bl_driver_data), GFP_KERNEL); if (!aat2870_bl) { ret = -ENOMEM; goto out; } memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_RAW; bd = devm_backlight_device_register(&pdev->dev, "aat2870-backlight", &pdev->dev, aat2870_bl, &aat2870_bl_ops, &props); if (IS_ERR(bd)) { dev_err(&pdev->dev, "Failed allocate memory for backlight device\n"); ret = PTR_ERR(bd); goto out; } aat2870_bl->pdev = pdev; platform_set_drvdata(pdev, aat2870_bl); aat2870_bl->bd = bd; if (pdata->channels > 0) aat2870_bl->channels = pdata->channels; else aat2870_bl->channels = AAT2870_BL_CH_ALL; if (pdata->max_current > 0) aat2870_bl->max_current = pdata->max_current; else aat2870_bl->max_current = AAT2870_CURRENT_27_9; if (pdata->max_brightness > 0) bd->props.max_brightness = pdata->max_brightness; else bd->props.max_brightness = 255; aat2870_bl->brightness = 0; bd->props.power = FB_BLANK_UNBLANK; bd->props.brightness = bd->props.max_brightness; ret = aat2870_bl_update_status(bd); if (ret < 0) { dev_err(&pdev->dev, "Failed to initialize\n"); return ret; } return 0; out: return ret; } static int aat2870_bl_remove(struct platform_device *pdev) { struct aat2870_bl_driver_data *aat2870_bl = platform_get_drvdata(pdev); struct backlight_device *bd = aat2870_bl->bd; bd->props.power = FB_BLANK_POWERDOWN; bd->props.brightness = 0; backlight_update_status(bd); return 0; } static struct platform_driver aat2870_bl_driver = { .driver = { .name = "aat2870-backlight", }, .probe = aat2870_bl_probe, .remove = aat2870_bl_remove, }; static int __init aat2870_bl_init(void) { return platform_driver_register(&aat2870_bl_driver); } subsys_initcall(aat2870_bl_init); static void __exit aat2870_bl_exit(void) { platform_driver_unregister(&aat2870_bl_driver); } module_exit(aat2870_bl_exit); MODULE_DESCRIPTION("AnalogicTech AAT2870 Backlight"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Jin Park "); -recheck-rcuperf.sh?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>patch) tree370efda701f03cccf21e02bb1fdd3b852547d75c /tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf.sh parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf.sh')