1 /* 2 * Copyright (C) 2016 Martin Peres 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining 5 * a copy of this software and associated documentation files (the 6 * "Software"), to deal in the Software without restriction, including 7 * without limitation the rights to use, copy, modify, merge, publish, 8 * distribute, sublicense, and/or sell copies of the Software, and to 9 * permit persons to whom the Software is furnished to do so, subject to 10 * the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the 13 * next paragraph) shall be included in all copies or substantial 14 * portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 19 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE 20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 * 24 */ 25 26 /* 27 * Authors: 28 * Martin Peres <martin.peres@free.fr> 29 */ 30 31 #include <linux/leds.h> 32 33 #include "nouveau_led.h" 34 #include <nvkm/subdev/gpio.h> 35 36 static enum led_brightness 37 nouveau_led_get_brightness(struct led_classdev *led) 38 { 39 struct drm_device *drm_dev = container_of(led, struct nouveau_led, led)->dev; 40 struct nouveau_drm *drm = nouveau_drm(drm_dev); 41 struct nvif_object *device = &drm->client.device.object; 42 u32 div, duty; 43 44 div = nvif_rd32(device, 0x61c880) & 0x00ffffff; 45 duty = nvif_rd32(device, 0x61c884) & 0x00ffffff; 46 47 if (div > 0) 48 return duty * LED_FULL / div; 49 else 50 return 0; 51 } 52 53 static void 54 nouveau_led_set_brightness(struct led_classdev *led, enum led_brightness value) 55 { 56 struct drm_device *drm_dev = container_of(led, struct nouveau_led, led)->dev; 57 struct nouveau_drm *drm = nouveau_drm(drm_dev); 58 struct nvif_object *device = &drm->client.device.object; 59 60 u32 input_clk = 27e6; /* PDISPLAY.SOR[1].PWM is connected to the crystal */ 61 u32 freq = 100; /* this is what nvidia uses and it should be good-enough */ 62 u32 div, duty; 63 64 div = input_clk / freq; 65 duty = value * div / LED_FULL; 66 67 /* for now, this is safe to directly poke those registers because: 68 * - A: nvidia never puts the logo led to any other PWM controler 69 * than PDISPLAY.SOR[1].PWM. 70 * - B: nouveau does not touch these registers anywhere else 71 */ 72 nvif_wr32(device, 0x61c880, div); 73 nvif_wr32(device, 0x61c884, 0xc0000000 | duty); 74 } 75 76 77 int 78 nouveau_led_init(struct drm_device *dev) 79 { 80 struct nouveau_drm *drm = nouveau_drm(dev); 81 struct nvkm_gpio *gpio = nvxx_gpio(&drm->client.device); 82 struct dcb_gpio_func logo_led; 83 int ret; 84 85 if (!gpio) 86 return 0; 87 88 /* check that there is a GPIO controlling the logo LED */ 89 if (nvkm_gpio_find(gpio, 0, DCB_GPIO_LOGO_LED_PWM, 0xff, &logo_led)) 90 return 0; 91 92 drm->led = kzalloc(sizeof(*drm->led), GFP_KERNEL); 93 if (!drm->led) 94 return -ENOMEM; 95 drm->led->dev = dev; 96 97 drm->led->led.name = "nvidia-logo"; 98 drm->led->led.max_brightness = 255; 99 drm->led->led.brightness_get = nouveau_led_get_brightness; 100 drm->led->led.brightness_set = nouveau_led_set_brightness; 101 102 ret = led_classdev_register(dev->dev, &drm->led->led); 103 if (ret) { 104 kfree(drm->led); 105 drm->led = NULL; 106 return ret; 107 } 108 109 return 0; 110 } 111 112 void 113 nouveau_led_suspend(struct drm_device *dev) 114 { 115 struct nouveau_drm *drm = nouveau_drm(dev); 116 117 if (drm->led) 118 led_classdev_suspend(&drm->led->led); 119 } 120 121 void 122 nouveau_led_resume(struct drm_device *dev) 123 { 124 struct nouveau_drm *drm = nouveau_drm(dev); 125 126 if (drm->led) 127 led_classdev_resume(&drm->led->led); 128 } 129 130 void 131 nouveau_led_fini(struct drm_device *dev) 132 { 133 struct nouveau_drm *drm = nouveau_drm(dev); 134 135 if (drm->led) { 136 led_classdev_unregister(&drm->led->led); 137 kfree(drm->led); 138 drm->led = NULL; 139 } 140 } 141