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>
26 #include <linux/via-core.h>
27 #include <linux/via_i2c.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 static 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)
119 struct i2c_msg msgs[2];
121 if (!via_i2c_par[adap].is_active)
125 msgs[1].flags = I2C_M_RD;
126 msgs[0].addr = msgs[1].addr = slave_addr / 2;
128 msgs[0].len = 1; msgs[1].len = 1;
129 msgs[0].buf = mm1; msgs[1].buf = pdata;
130 ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
139 int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
142 u8 msg[2] = { index, data };
145 if (!via_i2c_par[adap].is_active)
148 msgs.addr = slave_addr / 2;
151 ret = i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
160 int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len)
164 struct i2c_msg msgs[2];
166 if (!via_i2c_par[adap].is_active)
169 msgs[1].flags = I2C_M_RD;
170 msgs[0].addr = msgs[1].addr = slave_addr / 2;
172 msgs[0].len = 1; msgs[1].len = buff_len;
173 msgs[0].buf = mm1; msgs[1].buf = buff;
174 ret = i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
184 * Allow other viafb subdevices to look up a specific adapter
187 struct i2c_adapter *viafb_find_i2c_adapter(enum viafb_i2c_adap which)
189 struct via_i2c_stuff *stuff = &via_i2c_par[which];
191 return &stuff->adapter;
193 EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter);
196 static int create_i2c_bus(struct i2c_adapter *adapter,
197 struct i2c_algo_bit_data *algo,
198 struct via_port_cfg *adap_cfg,
199 struct pci_dev *pdev)
201 algo->setsda = via_i2c_setsda;
202 algo->setscl = via_i2c_setscl;
203 algo->getsda = via_i2c_getsda;
204 algo->getscl = via_i2c_getscl;
207 algo->data = adap_cfg;
209 sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
210 adap_cfg->ioport_index);
211 adapter->owner = THIS_MODULE;
212 adapter->class = I2C_CLASS_DDC;
213 adapter->algo_data = algo;
215 adapter->dev.parent = &pdev->dev;
217 adapter->dev.parent = NULL;
218 /* i2c_set_adapdata(adapter, adap_cfg); */
220 /* Raise SCL and SDA */
221 via_i2c_setsda(adap_cfg, 1);
222 via_i2c_setscl(adap_cfg, 1);
225 return i2c_bit_add_bus(adapter);
228 static int viafb_i2c_probe(struct platform_device *platdev)
231 struct via_port_cfg *configs;
233 i2c_vdev = platdev->dev.platform_data;
234 configs = i2c_vdev->port_cfg;
236 for (i = 0; i < VIAFB_NUM_PORTS; i++) {
237 struct via_port_cfg *adap_cfg = configs++;
238 struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
240 i2c_stuff->is_active = 0;
241 if (adap_cfg->type == 0 || adap_cfg->mode != VIA_MODE_I2C)
243 ret = create_i2c_bus(&i2c_stuff->adapter,
244 &i2c_stuff->algo, adap_cfg,
245 NULL); /* FIXME: PCIDEV */
247 printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n",
249 continue; /* Still try to make the rest */
251 i2c_stuff->is_active = 1;
257 static int viafb_i2c_remove(struct platform_device *platdev)
261 for (i = 0; i < VIAFB_NUM_PORTS; i++) {
262 struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
264 * Only remove those entries in the array that we've
265 * actually used (and thus initialized algo_data)
267 if (i2c_stuff->is_active)
268 i2c_del_adapter(&i2c_stuff->adapter);
273 static struct platform_driver via_i2c_driver = {
277 .probe = viafb_i2c_probe,
278 .remove = viafb_i2c_remove,
281 int viafb_i2c_init(void)
283 return platform_driver_register(&via_i2c_driver);
286 void viafb_i2c_exit(void)
288 platform_driver_unregister(&via_i2c_driver);