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      1 /*	$NetBSD: nouveau_nvkm_subdev_therm_fanpwm.c,v 1.3 2021/12/18 23:45:41 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2012 Red Hat Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  * Authors: Ben Skeggs
     25  * 	    Martin Peres
     26  */
     27 #include <sys/cdefs.h>
     28 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_therm_fanpwm.c,v 1.3 2021/12/18 23:45:41 riastradh Exp $");
     29 
     30 #include "priv.h"
     31 
     32 #include <core/option.h>
     33 #include <subdev/bios.h>
     34 #include <subdev/bios/fan.h>
     35 #include <subdev/gpio.h>
     36 
     37 struct nvkm_fanpwm {
     38 	struct nvkm_fan base;
     39 	struct dcb_gpio_func func;
     40 };
     41 
     42 static int
     43 nvkm_fanpwm_get(struct nvkm_therm *therm)
     44 {
     45 	struct nvkm_fanpwm *fan = (void *)therm->fan;
     46 	struct nvkm_device *device = therm->subdev.device;
     47 	struct nvkm_gpio *gpio = device->gpio;
     48 	int card_type = device->card_type;
     49 	u32 divs, duty;
     50 	int ret;
     51 
     52 	ret = therm->func->pwm_get(therm, fan->func.line, &divs, &duty);
     53 	if (ret == 0 && divs) {
     54 		divs = max(divs, duty);
     55 		if (card_type <= NV_40 || (fan->func.log[0] & 1))
     56 			duty = divs - duty;
     57 		return (duty * 100) / divs;
     58 	}
     59 
     60 	return nvkm_gpio_get(gpio, 0, fan->func.func, fan->func.line) * 100;
     61 }
     62 
     63 static int
     64 nvkm_fanpwm_set(struct nvkm_therm *therm, int percent)
     65 {
     66 	struct nvkm_fanpwm *fan = (void *)therm->fan;
     67 	int card_type = therm->subdev.device->card_type;
     68 	u32 divs, duty;
     69 	int ret;
     70 
     71 	divs = fan->base.perf.pwm_divisor;
     72 	if (fan->base.bios.pwm_freq) {
     73 		divs = 1;
     74 		if (therm->func->pwm_clock)
     75 			divs = therm->func->pwm_clock(therm, fan->func.line);
     76 		divs /= fan->base.bios.pwm_freq;
     77 	}
     78 
     79 	duty = ((divs * percent) + 99) / 100;
     80 	if (card_type <= NV_40 || (fan->func.log[0] & 1))
     81 		duty = divs - duty;
     82 
     83 	ret = therm->func->pwm_set(therm, fan->func.line, divs, duty);
     84 	if (ret == 0)
     85 		ret = therm->func->pwm_ctrl(therm, fan->func.line, true);
     86 	return ret;
     87 }
     88 
     89 int
     90 nvkm_fanpwm_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
     91 {
     92 	struct nvkm_device *device = therm->subdev.device;
     93 	struct nvkm_bios *bios = device->bios;
     94 	struct nvkm_fanpwm *fan;
     95 	struct nvbios_therm_fan info = {};
     96 	u32 divs, duty;
     97 
     98 	nvbios_fan_parse(bios, &info);
     99 
    100 	if (!nvkm_boolopt(device->cfgopt, "NvFanPWM", func->param) ||
    101 	    !therm->func->pwm_ctrl || info.type == NVBIOS_THERM_FAN_TOGGLE ||
    102 	     therm->func->pwm_get(therm, func->line, &divs, &duty) == -ENODEV)
    103 		return -ENODEV;
    104 
    105 	fan = kzalloc(sizeof(*fan), GFP_KERNEL);
    106 	therm->fan = &fan->base;
    107 	if (!fan)
    108 		return -ENOMEM;
    109 
    110 	fan->base.type = "PWM";
    111 	fan->base.get = nvkm_fanpwm_get;
    112 	fan->base.set = nvkm_fanpwm_set;
    113 	fan->func = *func;
    114 	return 0;
    115 }
    116