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281 lines
6.4 KiB
281 lines
6.4 KiB
// 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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