mirror of https://gitee.com/openkylin/linux.git
158 lines
3.9 KiB
C
158 lines
3.9 KiB
C
/*
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* Copyright 2012 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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*/
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/*
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* Authors: Dave Airlie <airlied@redhat.com>
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*/
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#include <linux/export.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include <drm/drmP.h>
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#include "mgag200_drv.h"
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static int mga_i2c_read_gpio(struct mga_device *mdev)
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{
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WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
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return RREG8(DAC_DATA);
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}
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static void mga_i2c_set_gpio(struct mga_device *mdev, int mask, int val)
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{
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int tmp;
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WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL);
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tmp = (RREG8(DAC_DATA) & mask) | val;
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WREG_DAC(MGA1064_GEN_IO_CTL, tmp);
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WREG_DAC(MGA1064_GEN_IO_DATA, 0);
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}
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static inline void mga_i2c_set(struct mga_device *mdev, int mask, int state)
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{
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if (state)
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state = 0;
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else
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state = mask;
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mga_i2c_set_gpio(mdev, ~mask, state);
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}
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static void mga_gpio_setsda(void *data, int state)
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{
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struct mga_i2c_chan *i2c = data;
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struct mga_device *mdev = i2c->dev->dev_private;
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mga_i2c_set(mdev, i2c->data, state);
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}
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static void mga_gpio_setscl(void *data, int state)
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{
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struct mga_i2c_chan *i2c = data;
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struct mga_device *mdev = i2c->dev->dev_private;
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mga_i2c_set(mdev, i2c->clock, state);
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}
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static int mga_gpio_getsda(void *data)
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{
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struct mga_i2c_chan *i2c = data;
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struct mga_device *mdev = i2c->dev->dev_private;
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return (mga_i2c_read_gpio(mdev) & i2c->data) ? 1 : 0;
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}
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static int mga_gpio_getscl(void *data)
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{
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struct mga_i2c_chan *i2c = data;
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struct mga_device *mdev = i2c->dev->dev_private;
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return (mga_i2c_read_gpio(mdev) & i2c->clock) ? 1 : 0;
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}
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struct mga_i2c_chan *mgag200_i2c_create(struct drm_device *dev)
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{
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struct mga_device *mdev = dev->dev_private;
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struct mga_i2c_chan *i2c;
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int ret;
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int data, clock;
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WREG_DAC(MGA1064_GEN_IO_CTL2, 1);
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WREG_DAC(MGA1064_GEN_IO_DATA, 0xff);
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WREG_DAC(MGA1064_GEN_IO_CTL, 0);
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switch (mdev->type) {
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case G200_SE_A:
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case G200_SE_B:
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case G200_EV:
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case G200_WB:
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case G200_EW3:
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data = 1;
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clock = 2;
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break;
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case G200_EH:
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case G200_ER:
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data = 2;
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clock = 1;
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break;
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default:
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data = 2;
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clock = 8;
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break;
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}
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i2c = kzalloc(sizeof(struct mga_i2c_chan), GFP_KERNEL);
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if (!i2c)
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return NULL;
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i2c->data = data;
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i2c->clock = clock;
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i2c->adapter.owner = THIS_MODULE;
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i2c->adapter.class = I2C_CLASS_DDC;
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i2c->adapter.dev.parent = &dev->pdev->dev;
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i2c->dev = dev;
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i2c_set_adapdata(&i2c->adapter, i2c);
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snprintf(i2c->adapter.name, sizeof(i2c->adapter.name), "mga i2c");
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i2c->adapter.algo_data = &i2c->bit;
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i2c->bit.udelay = 10;
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i2c->bit.timeout = 2;
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i2c->bit.data = i2c;
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i2c->bit.setsda = mga_gpio_setsda;
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i2c->bit.setscl = mga_gpio_setscl;
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i2c->bit.getsda = mga_gpio_getsda;
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i2c->bit.getscl = mga_gpio_getscl;
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ret = i2c_bit_add_bus(&i2c->adapter);
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if (ret) {
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kfree(i2c);
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i2c = NULL;
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}
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return i2c;
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}
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void mgag200_i2c_destroy(struct mga_i2c_chan *i2c)
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{
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if (!i2c)
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return;
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i2c_del_adapter(&i2c->adapter);
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kfree(i2c);
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}
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