base.c

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/*
 * 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)
{
    if (line == 0xff && tag == 0xff)
        return -EINVAL;

    if (!dcb_gpio_parse(nouveau_bios(gpio), idx, tag, line, func))
        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;
}

static int
nouveau_gpio_irq(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line, bool on)
{
    struct dcb_gpio_func func;
    int ret;

    ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
    if (ret == 0) {
        if (idx == 0 && gpio->irq_enable)
            gpio->irq_enable(gpio, func.line, on);
        else
            ret = -ENODEV;
    }

    return ret;
}

struct gpio_isr {
    struct nouveau_gpio *gpio;
    struct list_head head;
    struct work_struct work;
    int idx;
    struct dcb_gpio_func func;
    void (*handler)(void *, int);
    void *data;
    bool inhibit;
};

static void
nouveau_gpio_isr_bh(struct work_struct *work)
{
    struct gpio_isr *isr = container_of(work, struct gpio_isr, work);
    struct nouveau_gpio *gpio = isr->gpio;
    unsigned long flags;
    int state;

    state = nouveau_gpio_get(gpio, isr->idx, isr->func.func,
                         isr->func.line);
    if (state >= 0)
        isr->handler(isr->data, state);

    spin_lock_irqsave(&gpio->lock, flags);
    isr->inhibit = false;
    spin_unlock_irqrestore(&gpio->lock, flags);
}

static void
nouveau_gpio_isr_run(struct nouveau_gpio *gpio, int idx, u32 line_mask)
{
    struct gpio_isr *isr;

    if (idx != 0)
        return;

    spin_lock(&gpio->lock);
    list_for_each_entry(isr, &gpio->isr, head) {
        if (line_mask & (1 << isr->func.line)) {
            if (isr->inhibit)
                continue;
            isr->inhibit = true;
            schedule_work(&isr->work);
        }
    }
    spin_unlock(&gpio->lock);
}

static int
nouveau_gpio_isr_add(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line,
             void (*handler)(void *, int), void *data)
{
    struct gpio_isr *isr;
    unsigned long flags;
    int ret;

    isr = kzalloc(sizeof(*isr), GFP_KERNEL);
    if (!isr)
        return -ENOMEM;

    ret = nouveau_gpio_find(gpio, idx, tag, line, &isr->func);
    if (ret) {
        kfree(isr);
        return ret;
    }

    INIT_WORK(&isr->work, nouveau_gpio_isr_bh);
    isr->gpio = gpio;
    isr->handler = handler;
    isr->data = data;
    isr->idx = idx;

    spin_lock_irqsave(&gpio->lock, flags);
    list_add(&isr->head, &gpio->isr);
    spin_unlock_irqrestore(&gpio->lock, flags);
    return 0;
}

static void
nouveau_gpio_isr_del(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line,
             void (*handler)(void *, int), void *data)
{
    struct gpio_isr *isr, *tmp;
    struct dcb_gpio_func func;
    unsigned long flags;
    LIST_HEAD(tofree);
    int ret;

    ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
    if (ret == 0) {
        spin_lock_irqsave(&gpio->lock, flags);
        list_for_each_entry_safe(isr, tmp, &gpio->isr, head) {
            if (memcmp(&isr->func, &func, sizeof(func)) ||
                isr->idx != idx ||
                isr->handler != handler || isr->data != data)
                continue;
            list_move_tail(&isr->head, &tofree);
        }
        spin_unlock_irqrestore(&gpio->lock, flags);

        list_for_each_entry_safe(isr, tmp, &tofree, head) {
            flush_work(&isr->work);
            kfree(isr);
        }
    }
}

int
nouveau_gpio_create_(struct nouveau_object *parent,
             struct nouveau_object *engine,
             struct nouveau_oclass *oclass, 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;

    gpio->find = nouveau_gpio_find;
    gpio->set  = nouveau_gpio_set;
    gpio->get  = nouveau_gpio_get;
    gpio->irq  = nouveau_gpio_irq;
    gpio->isr_run = nouveau_gpio_isr_run;
    gpio->isr_add = nouveau_gpio_isr_add;
    gpio->isr_del = nouveau_gpio_isr_del;
    INIT_LIST_HEAD(&gpio->isr);
    spin_lock_init(&gpio->lock);
    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);
    }
    return ret;
}