forked from luck/tmp_suning_uos_patched
2c4c8a8a73
This patch fixes the I2C emulation on GPIO ports by enabling it (software controlled) and disabling the output on a GPIO line before reading it. Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
296 lines
7.1 KiB
C
296 lines
7.1 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation;
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* either version 2, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR
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* A PARTICULAR PURPOSE.See the GNU General Public License
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* for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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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