/* * Backlight Driver for Dialog DA9052 PMICs * * Copyright(c) 2012 Dialog Semiconductor Ltd. * * Author: David Dajun Chen * * 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. * */ #include #include #include #include #include #include #include #define DA9052_MAX_BRIGHTNESS 0xFF enum { DA9052_WLEDS_OFF, DA9052_WLEDS_ON, }; enum { DA9052_TYPE_WLED1, DA9052_TYPE_WLED2, DA9052_TYPE_WLED3, }; static const unsigned char wled_bank[] = { DA9052_LED1_CONF_REG, DA9052_LED2_CONF_REG, DA9052_LED3_CONF_REG, }; struct da9052_bl { struct da9052 *da9052; uint brightness; uint state; uint led_reg; }; static int da9052_adjust_wled_brightness(struct da9052_bl *wleds) { unsigned char boost_en; unsigned char i_sink; int ret; boost_en = 0x3F; i_sink = 0xFF; if (wleds->state == DA9052_WLEDS_OFF) { boost_en = 0x00; i_sink = 0x00; } ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en); if (ret < 0) return ret; ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink); if (ret < 0) return ret; ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], 0x0); if (ret < 0) return ret; usleep_range(10000, 11000); if (wleds->brightness) { ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], wleds->brightness); if (ret < 0) return ret; } return 0; } static int da9052_backlight_update_status(struct backlight_device *bl) { int brightness = bl->props.brightness; struct da9052_bl *wleds = bl_get_data(bl); wleds->brightness = brightness; wleds->state = DA9052_WLEDS_ON; return da9052_adjust_wled_brightness(wleds); } static int da9052_backlight_get_brightness(struct backlight_device *bl) { struct da9052_bl *wleds = bl_get_data(bl); return wleds->brightness; } static const struct backlight_ops da9052_backlight_ops = { .update_status = da9052_backlight_update_status, .get_brightness = da9052_backlight_get_brightness, }; static int da9052_backlight_probe(struct platform_device *pdev) { struct backlight_device *bl; struct backlight_properties props; struct da9052_bl *wleds; wleds = devm_kzalloc(&pdev->dev, sizeof(struct da9052_bl), GFP_KERNEL); if (!wleds) return -ENOMEM; wleds->da9052 = dev_get_drvdata(pdev->dev.parent); wleds->brightness = 0; wleds->led_reg = platform_get_device_id(pdev)->driver_data; wleds->state = DA9052_WLEDS_OFF; props.type = BACKLIGHT_RAW; props.max_brightness = DA9052_MAX_BRIGHTNESS; bl = devm_backlight_device_register(&pdev->dev, pdev->name, wleds->da9052->dev, wleds, &da9052_backlight_ops, &props); if (IS_ERR(bl)) { dev_err(&pdev->dev, "Failed to register backlight\n"); return PTR_ERR(bl); } bl->props.max_brightness = DA9052_MAX_BRIGHTNESS; bl->props.brightness = 0; platform_set_drvdata(pdev, bl); return da9052_adjust_wled_brightness(wleds); } static int da9052_backlight_remove(struct platform_device *pdev) { struct backlight_device *bl = platform_get_drvdata(pdev); struct da9052_bl *wleds = bl_get_data(bl); wleds->brightness = 0; wleds->state = DA9052_WLEDS_OFF; da9052_adjust_wled_brightness(wleds); return 0; } static const struct platform_device_id da9052_wled_ids[] = { { .name = "da9052-wled1", .driver_data = DA9052_TYPE_WLED1, }, { .name = "da9052-wled2", .driver_data = DA9052_TYPE_WLED2, }, { .name = "da9052-wled3", .driver_data = DA9052_TYPE_WLED3, }, { }, }; static struct platform_driver da9052_wled_driver = { .probe = da9052_backlight_probe, .remove = da9052_backlight_remove, .id_table = da9052_wled_ids, .driver = { .name = "da9052-wled", }, }; module_platform_driver(da9052_wled_driver); MODULE_AUTHOR("David Dajun Chen "); MODULE_DESCRIPTION("Backlight driver for DA9052 PMIC"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:da9052-backlight"); option>space:mode:
authorThomas Gleixner <tglx@linutronix.de>2017-01-31 09:37:34 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-31 21:47:58 +0100
commit0becc0ae5b42828785b589f686725ff5bc3b9b25 (patch)
treebe6d0e1f37c38ed0a7dd5da2d4b1e93f0fb43101 /tools/perf/pmu-events/jevents.c
parent24c2503255d35c269b67162c397a1a1c1e02f6ce (diff)
x86/mce: Make timer handling more robust
Erik reported that on a preproduction hardware a CMCI storm triggers the BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is started by the CMCI logic before the MCE CPU hotplug callback starts the timer with add_timer_on(). So the timer is already queued which triggers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'tools/perf/pmu-events/jevents.c')