2 * Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
3 * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public
7 * License as published by the Free Software Foundation;
8 * either version 2, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
12 * the implied warranty of MERCHANTABILITY or FITNESS FOR
13 * A PARTICULAR PURPOSE.See the GNU General Public License
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
19 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 #include <linux/platform_device.h>
23 #include <linux/delay.h>
24 #include <linux/spinlock.h>
25 #include <linux/module.h>
30 * There can only be one set of these, so there's no point in having
31 * them be dynamically allocated...
33 #define VIAFB_NUM_I2C 5
34 static struct via_i2c_stuff via_i2c_par[VIAFB_NUM_I2C];
35 struct viafb_dev *i2c_vdev; /* Passed in from core */
37 static void via_i2c_setscl(void *data, int state)
40 struct via_port_cfg *adap_data = data;
43 spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
44 val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
49 switch (adap_data->type) {
57 printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
59 via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
60 spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
63 static int via_i2c_getscl(void *data)
65 struct via_port_cfg *adap_data = data;
69 spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
70 if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x08)
72 spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
76 static int via_i2c_getsda(void *data)
78 struct via_port_cfg *adap_data = data;
82 spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
83 if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x04)
85 spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
89 static void via_i2c_setsda(void *data, int state)
92 struct via_port_cfg *adap_data = data;
95 spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
96 val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0;
101 switch (adap_data->type) {
109 printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
111 via_write_reg(adap_data->io_port, adap_data->ioport_index, val);
112 spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
115 int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata)
118 struct i2c_msg msgs[2];
120 if (!via_i2c_par[adap].is_active)
124 msgs[1].flags = I2C_M_RD;
125 msgs[0].addr = msgs[1].addr = slave_addr / 2;
127 msgs[0].len = 1; msgs[1].len = 1;
128 msgs[0].buf = mm1; msgs[1].buf = pdata;
129 return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
132 int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
134 u8 msg[2] = { index, data };
137 if (!via_i2c_par[adap].is_active)
140 msgs.addr = slave_addr / 2;
143 return i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
146 int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len)
149 struct i2c_msg msgs[2];
151 if (!via_i2c_par[adap].is_active)
154 msgs[1].flags = I2C_M_RD;
155 msgs[0].addr = msgs[1].addr = slave_addr / 2;
157 msgs[0].len = 1; msgs[1].len = buff_len;
158 msgs[0].buf = mm1; msgs[1].buf = buff;
159 return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
163 * Allow other viafb subdevices to look up a specific adapter
166 struct i2c_adapter *viafb_find_i2c_adapter(enum viafb_i2c_adap which)
168 struct via_i2c_stuff *stuff = &via_i2c_par[which];
170 return &stuff->adapter;
172 EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter);
175 static int create_i2c_bus(struct i2c_adapter *adapter,
176 struct i2c_algo_bit_data *algo,
177 struct via_port_cfg *adap_cfg,
178 struct pci_dev *pdev)
180 algo->setsda = via_i2c_setsda;
181 algo->setscl = via_i2c_setscl;
182 algo->getsda = via_i2c_getsda;
183 algo->getscl = via_i2c_getscl;
186 algo->data = adap_cfg;
188 sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
189 adap_cfg->ioport_index);
190 adapter->owner = THIS_MODULE;
191 adapter->id = 0x01FFFF;
192 adapter->class = I2C_CLASS_DDC;
193 adapter->algo_data = algo;
195 adapter->dev.parent = &pdev->dev;
197 adapter->dev.parent = NULL;
198 /* i2c_set_adapdata(adapter, adap_cfg); */
200 /* Raise SCL and SDA */
201 via_i2c_setsda(adap_cfg, 1);
202 via_i2c_setscl(adap_cfg, 1);
205 return i2c_bit_add_bus(adapter);
208 static int viafb_i2c_probe(struct platform_device *platdev)
211 struct via_port_cfg *configs;
213 i2c_vdev = platdev->dev.platform_data;
214 configs = i2c_vdev->port_cfg;
216 for (i = 0; i < VIAFB_NUM_PORTS; i++) {
217 struct via_port_cfg *adap_cfg = configs++;
218 struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
220 i2c_stuff->is_active = 0;
221 if (adap_cfg->type == 0 || adap_cfg->mode != VIA_MODE_I2C)
223 ret = create_i2c_bus(&i2c_stuff->adapter,
224 &i2c_stuff->algo, adap_cfg,
225 NULL); /* FIXME: PCIDEV */
227 printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n",
229 continue; /* Still try to make the rest */
231 i2c_stuff->is_active = 1;
237 static int viafb_i2c_remove(struct platform_device *platdev)
241 for (i = 0; i < VIAFB_NUM_PORTS; i++) {
242 struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
244 * Only remove those entries in the array that we've
245 * actually used (and thus initialized algo_data)
247 if (i2c_stuff->is_active)
248 i2c_del_adapter(&i2c_stuff->adapter);
253 static struct platform_driver via_i2c_driver = {
257 .probe = viafb_i2c_probe,
258 .remove = viafb_i2c_remove,
261 int viafb_i2c_init(void)
263 return platform_driver_register(&via_i2c_driver);
266 void viafb_i2c_exit(void)
268 platform_driver_unregister(&via_i2c_driver);