diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/core/subdev/gpio/base.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/core/subdev/gpio/base.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/core/subdev/gpio/base.c b/drivers/gpu/drm/nouveau/core/subdev/gpio/base.c new file mode 100644 index 0000000..d422acc --- /dev/null +++ b/drivers/gpu/drm/nouveau/core/subdev/gpio/base.c @@ -0,0 +1,158 @@ +/* + * Copyright 2011 Red Hat Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Ben Skeggs + */ + +#include <subdev/gpio.h> +#include <subdev/bios.h> +#include <subdev/bios/gpio.h> + +static int +nouveau_gpio_drive(struct nouveau_gpio *gpio, + int idx, int line, int dir, int out) +{ + return gpio->drive ? gpio->drive(gpio, line, dir, out) : -ENODEV; +} + +static int +nouveau_gpio_sense(struct nouveau_gpio *gpio, int idx, int line) +{ + return gpio->sense ? gpio->sense(gpio, line) : -ENODEV; +} + +static int +nouveau_gpio_find(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line, + struct dcb_gpio_func *func) +{ + struct nouveau_bios *bios = nouveau_bios(gpio); + u8 ver, len; + u16 data; + + if (line == 0xff && tag == 0xff) + return -EINVAL; + + data = dcb_gpio_match(bios, idx, tag, line, &ver, &len, func); + if (data) + return 0; + + /* Apple iMac G4 NV18 */ + if (nv_device_match(nv_object(gpio), 0x0189, 0x10de, 0x0010)) { + if (tag == DCB_GPIO_TVDAC0) { + *func = (struct dcb_gpio_func) { + .func = DCB_GPIO_TVDAC0, + .line = 4, + .log[0] = 0, + .log[1] = 1, + }; + return 0; + } + } + + return -EINVAL; +} + +static int +nouveau_gpio_set(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line, int state) +{ + struct dcb_gpio_func func; + int ret; + + ret = nouveau_gpio_find(gpio, idx, tag, line, &func); + if (ret == 0) { + int dir = !!(func.log[state] & 0x02); + int out = !!(func.log[state] & 0x01); + ret = nouveau_gpio_drive(gpio, idx, func.line, dir, out); + } + + return ret; +} + +static int +nouveau_gpio_get(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line) +{ + struct dcb_gpio_func func; + int ret; + + ret = nouveau_gpio_find(gpio, idx, tag, line, &func); + if (ret == 0) { + ret = nouveau_gpio_sense(gpio, idx, func.line); + if (ret >= 0) + ret = (ret == (func.log[1] & 1)); + } + + return ret; +} + +void +_nouveau_gpio_dtor(struct nouveau_object *object) +{ + struct nouveau_gpio *gpio = (void *)object; + nouveau_event_destroy(&gpio->events); + nouveau_subdev_destroy(&gpio->base); +} + +int +nouveau_gpio_create_(struct nouveau_object *parent, + struct nouveau_object *engine, + struct nouveau_oclass *oclass, int lines, + int length, void **pobject) +{ + struct nouveau_gpio *gpio; + int ret; + + ret = nouveau_subdev_create_(parent, engine, oclass, 0, "GPIO", "gpio", + length, pobject); + gpio = *pobject; + if (ret) + return ret; + + ret = nouveau_event_create(lines, &gpio->events); + if (ret) + return ret; + + gpio->find = nouveau_gpio_find; + gpio->set = nouveau_gpio_set; + gpio->get = nouveau_gpio_get; + return 0; +} + +static struct dmi_system_id gpio_reset_ids[] = { + { + .ident = "Apple Macbook 10,1", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro10,1"), + } + }, + { } +}; + +int +nouveau_gpio_init(struct nouveau_gpio *gpio) +{ + int ret = nouveau_subdev_init(&gpio->base); + if (ret == 0 && gpio->reset) { + if (dmi_check_system(gpio_reset_ids)) + gpio->reset(gpio, DCB_GPIO_UNUSED); + } + return ret; +} |