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64b70da038
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 or at your option any later version this program is distributed in the hope that it will be useful but without any warranties or representations without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 43 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520170858.826676366@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
282 lines
6.4 KiB
C
282 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
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* Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
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*/
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <linux/via-core.h>
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#include <linux/via_i2c.h>
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/*
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* There can only be one set of these, so there's no point in having
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* them be dynamically allocated...
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*/
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#define VIAFB_NUM_I2C 5
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static struct via_i2c_stuff via_i2c_par[VIAFB_NUM_I2C];
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static struct viafb_dev *i2c_vdev; /* Passed in from core */
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static void via_i2c_setscl(void *data, int state)
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{
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u8 val;
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struct via_port_cfg *adap_data = data;
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unsigned long flags;
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spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
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val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
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if (state)
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val |= 0x20;
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else
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val &= ~0x20;
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switch (adap_data->type) {
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case VIA_PORT_I2C:
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val |= 0x01;
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break;
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case VIA_PORT_GPIO:
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val |= 0x82;
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break;
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default:
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printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
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}
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via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
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spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
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}
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static int via_i2c_getscl(void *data)
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{
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struct via_port_cfg *adap_data = data;
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
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if (adap_data->type == VIA_PORT_GPIO)
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via_write_reg_mask(adap_data->io_port, adap_data->ioport_index,
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0, 0x80);
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if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x08)
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ret = 1;
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spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
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return ret;
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}
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static int via_i2c_getsda(void *data)
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{
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struct via_port_cfg *adap_data = data;
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unsigned long flags;
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int ret = 0;
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spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
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if (adap_data->type == VIA_PORT_GPIO)
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via_write_reg_mask(adap_data->io_port, adap_data->ioport_index,
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0, 0x40);
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if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x04)
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ret = 1;
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spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
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return ret;
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}
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static void via_i2c_setsda(void *data, int state)
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{
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u8 val;
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struct via_port_cfg *adap_data = data;
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unsigned long flags;
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spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
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val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
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if (state)
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val |= 0x10;
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else
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val &= ~0x10;
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switch (adap_data->type) {
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case VIA_PORT_I2C:
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val |= 0x01;
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break;
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case VIA_PORT_GPIO:
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val |= 0x42;
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break;
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default:
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printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
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}
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via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
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spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
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}
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int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata)
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{
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int ret;
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u8 mm1[] = {0x00};
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struct i2c_msg msgs[2];
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if (!via_i2c_par[adap].is_active)
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return -ENODEV;
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*pdata = 0;
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msgs[0].flags = 0;
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msgs[1].flags = I2C_M_RD;
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msgs[0].addr = msgs[1].addr = slave_addr / 2;
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mm1[0] = index;
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msgs[0].len = 1; msgs[1].len = 1;
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msgs[0].buf = mm1; msgs[1].buf = pdata;
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ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
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if (ret == 2)
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ret = 0;
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else if (ret >= 0)
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ret = -EIO;
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return ret;
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}
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int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
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{
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int ret;
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u8 msg[2] = { index, data };
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struct i2c_msg msgs;
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if (!via_i2c_par[adap].is_active)
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return -ENODEV;
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msgs.flags = 0;
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msgs.addr = slave_addr / 2;
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msgs.len = 2;
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msgs.buf = msg;
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ret = i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
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if (ret == 1)
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ret = 0;
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else if (ret >= 0)
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ret = -EIO;
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return ret;
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}
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int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len)
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{
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int ret;
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u8 mm1[] = {0x00};
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struct i2c_msg msgs[2];
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if (!via_i2c_par[adap].is_active)
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return -ENODEV;
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msgs[0].flags = 0;
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msgs[1].flags = I2C_M_RD;
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msgs[0].addr = msgs[1].addr = slave_addr / 2;
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mm1[0] = index;
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msgs[0].len = 1; msgs[1].len = buff_len;
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msgs[0].buf = mm1; msgs[1].buf = buff;
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ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
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if (ret == 2)
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ret = 0;
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else if (ret >= 0)
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ret = -EIO;
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return ret;
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}
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/*
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* Allow other viafb subdevices to look up a specific adapter
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* by port name.
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*/
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struct i2c_adapter *viafb_find_i2c_adapter(enum viafb_i2c_adap which)
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{
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struct via_i2c_stuff *stuff = &via_i2c_par[which];
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return &stuff->adapter;
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}
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EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter);
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static int create_i2c_bus(struct i2c_adapter *adapter,
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struct i2c_algo_bit_data *algo,
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struct via_port_cfg *adap_cfg,
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struct pci_dev *pdev)
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{
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algo->setsda = via_i2c_setsda;
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algo->setscl = via_i2c_setscl;
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algo->getsda = via_i2c_getsda;
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algo->getscl = via_i2c_getscl;
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algo->udelay = 10;
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algo->timeout = 2;
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algo->data = adap_cfg;
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sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
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adap_cfg->ioport_index);
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adapter->owner = THIS_MODULE;
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adapter->class = I2C_CLASS_DDC;
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adapter->algo_data = algo;
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if (pdev)
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adapter->dev.parent = &pdev->dev;
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else
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adapter->dev.parent = NULL;
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/* i2c_set_adapdata(adapter, adap_cfg); */
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/* Raise SCL and SDA */
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via_i2c_setsda(adap_cfg, 1);
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via_i2c_setscl(adap_cfg, 1);
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udelay(20);
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return i2c_bit_add_bus(adapter);
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}
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static int viafb_i2c_probe(struct platform_device *platdev)
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{
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int i, ret;
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struct via_port_cfg *configs;
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i2c_vdev = platdev->dev.platform_data;
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configs = i2c_vdev->port_cfg;
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for (i = 0; i < VIAFB_NUM_PORTS; i++) {
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struct via_port_cfg *adap_cfg = configs++;
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struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
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i2c_stuff->is_active = 0;
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if (adap_cfg->type == 0 || adap_cfg->mode != VIA_MODE_I2C)
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continue;
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ret = create_i2c_bus(&i2c_stuff->adapter,
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&i2c_stuff->algo, adap_cfg,
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NULL); /* FIXME: PCIDEV */
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if (ret < 0) {
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printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n",
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i, ret);
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continue; /* Still try to make the rest */
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}
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i2c_stuff->is_active = 1;
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}
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return 0;
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}
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static int viafb_i2c_remove(struct platform_device *platdev)
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{
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int i;
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for (i = 0; i < VIAFB_NUM_PORTS; i++) {
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struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
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/*
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* Only remove those entries in the array that we've
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* actually used (and thus initialized algo_data)
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*/
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if (i2c_stuff->is_active)
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i2c_del_adapter(&i2c_stuff->adapter);
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}
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return 0;
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}
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static struct platform_driver via_i2c_driver = {
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.driver = {
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.name = "viafb-i2c",
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},
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.probe = viafb_i2c_probe,
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.remove = viafb_i2c_remove,
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};
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int viafb_i2c_init(void)
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{
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return platform_driver_register(&via_i2c_driver);
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}
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void viafb_i2c_exit(void)
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{
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platform_driver_unregister(&via_i2c_driver);
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}
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