/* * Generic ADC thermal driver * * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved. * * Author: Laxman Dewangan * * 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. */ #include #include #include #include #include #include struct gadc_thermal_info { struct device *dev; struct thermal_zone_device *tz_dev; struct iio_channel *channel; s32 *lookup_table; int nlookup_table; }; static int gadc_thermal_adc_to_temp(struct gadc_thermal_info *gti, int val) { int temp, adc_hi, adc_lo; int i; for (i = 0; i < gti->nlookup_table; i++) { if (val >= gti->lookup_table[2 * i + 1]) break; } if (i == 0) { temp = gti->lookup_table[0]; } else if (i >= (gti->nlookup_table - 1)) { temp = gti->lookup_table[2 * (gti->nlookup_table - 1)]; } else { adc_hi = gti->lookup_table[2 * i - 1]; adc_lo = gti->lookup_table[2 * i + 1]; temp = gti->lookup_table[2 * i]; temp -= ((val - adc_lo) * 1000) / (adc_hi - adc_lo); } return temp; } static int gadc_thermal_get_temp(void *data, int *temp) { struct gadc_thermal_info *gti = data; int val; int ret; ret = iio_read_channel_processed(gti->channel, &val); if (ret < 0) { dev_err(gti->dev, "IIO channel read failed %d\n", ret); return ret; } *temp = gadc_thermal_adc_to_temp(gti, val); return 0; } static const struct thermal_zone_of_device_ops gadc_thermal_ops = { .get_temp = gadc_thermal_get_temp, }; static int gadc_thermal_read_linear_lookup_table(struct device *dev, struct gadc_thermal_info *gti) { struct device_node *np = dev->of_node; int ntable; int ret; ntable = of_property_count_elems_of_size(np, "temperature-lookup-table", sizeof(u32)); if (ntable < 0) { dev_err(dev, "Lookup table is not provided\n"); return ntable; } if (ntable % 2) { dev_err(dev, "Pair of temperature vs ADC read value missing\n"); return -EINVAL; } gti->lookup_table = devm_kzalloc(dev, sizeof(*gti->lookup_table) * ntable, GFP_KERNEL); if (!gti->lookup_table) return -ENOMEM; ret = of_property_read_u32_array(np, "temperature-lookup-table", (u32 *)gti->lookup_table, ntable); if (ret < 0) { dev_err(dev, "Failed to read temperature lookup table: %d\n", ret); return ret; } gti->nlookup_table = ntable / 2; return 0; } static int gadc_thermal_probe(struct platform_device *pdev) { struct gadc_thermal_info *gti; int ret; if (!pdev->dev.of_node) { dev_err(&pdev->dev, "Only DT based supported\n"); return -ENODEV; } gti = devm_kzalloc(&pdev->dev, sizeof(*gti), GFP_KERNEL); if (!gti) return -ENOMEM; ret = gadc_thermal_read_linear_lookup_table(&pdev->dev, gti); if (ret < 0) return ret; gti->dev = &pdev->dev; platform_set_drvdata(pdev, gti); gti->channel = iio_channel_get(&pdev->dev, "sensor-channel"); if (IS_ERR(gti->channel)) { ret = PTR_ERR(gti->channel); dev_err(&pdev->dev, "IIO channel not found: %d\n", ret); return ret; } gti->tz_dev = thermal_zone_of_sensor_register(&pdev->dev, 0, gti, &gadc_thermal_ops); if (IS_ERR(gti->tz_dev)) { ret = PTR_ERR(gti->tz_dev); dev_err(&pdev->dev, "Thermal zone sensor register failed: %d\n", ret); goto sensor_fail; } return 0; sensor_fail: iio_channel_release(gti->channel); return ret; } static int gadc_thermal_remove(struct platform_device *pdev) { struct gadc_thermal_info *gti = platform_get_drvdata(pdev); thermal_zone_of_sensor_unregister(&pdev->dev, gti->tz_dev); iio_channel_release(gti->channel); return 0; } static const struct of_device_id of_adc_thermal_match[] = { { .compatible = "generic-adc-thermal", }, {}, }; MODULE_DEVICE_TABLE(of, of_adc_thermal_match); static struct platform_driver gadc_thermal_driver = { .driver = { .name = "generic-adc-thermal", .of_match_table = of_adc_thermal_match, }, .probe = gadc_thermal_probe, .remove = gadc_thermal_remove, }; module_platform_driver(gadc_thermal_driver); MODULE_AUTHOR("Laxman Dewangan "); MODULE_DESCRIPTION("Generic ADC thermal driver using IIO framework with DT"); MODULE_LICENSE("GPL v2"); 20'>20space:mode:
authorTony Lindgren <tony@atomide.com>2017-01-24 09:18:57 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-25 11:02:29 +0100
commit407788b51db6f6aab499d02420082f436abf3238 (patch)
treeb2fb3c885baf47cd2bd8ee0429f423b352e11905 /tools/perf/util/demangle-rust.c
parent7a308bb3016f57e5be11a677d15b821536419d36 (diff)
usb: musb: Fix host mode error -71 regression
Commit 467d5c980709 ("usb: musb: Implement session bit based runtime PM for musb-core") started implementing musb generic runtime PM support by introducing devctl register session bit based state control. This caused a regression where if a USB mass storage device is connected to a USB hub, we can get: usb 1-1: reset high-speed USB device number 2 using musb-hdrc usb 1-1: device descriptor read/64, error -71 usb 1-1.1: new high-speed USB device number 4 using musb-hdrc This is because before the USB storage device is connected, musb is in OTG_STATE_A_SUSPEND. And we currently only set need_finish_resume in musb_stage0_irq() and the related code calling finish_resume_work in musb_resume() and musb_runtime_resume() never gets called. To fix the issue, we can call schedule_delayed_work() directly in musb_stage0_irq() to have finish_resume_work run. And we should no longer never get interrupts when when suspended. We have changed musb to no longer need pm_runtime_irqsafe(). The need_finish_resume flag was added in commit 9298b4aad37e ("usb: musb: fix device hotplug behind hub") and no longer applies as far as I can tell. So let's just remove the earlier code that no longer is needed. Fixes: 467d5c980709 ("usb: musb: Implement session bit based runtime PM for musb-core") Reported-by: Bin Liu <b-liu@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Bin Liu <b-liu@ti.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/util/demangle-rust.c')