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9f291634 | 1 | /* |
277d32a3 | 2 | * Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved. |
9f291634 JC |
3 | * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved. |
4 | ||
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. | |
9 | ||
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 | |
14 | * for more details. | |
15 | ||
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 | |
18 | * Foundation, Inc., | |
19 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
20 | */ | |
21 | ||
7582eb9b | 22 | #include <linux/platform_device.h> |
9221fc65 JC |
23 | #include <linux/delay.h> |
24 | #include <linux/spinlock.h> | |
25 | #include <linux/module.h> | |
ec66841e JC |
26 | #include <linux/via-core.h> |
27 | #include <linux/via_i2c.h> | |
9f291634 | 28 | |
f045f77b JC |
29 | /* |
30 | * There can only be one set of these, so there's no point in having | |
31 | * them be dynamically allocated... | |
32 | */ | |
33 | #define VIAFB_NUM_I2C 5 | |
34 | static struct via_i2c_stuff via_i2c_par[VIAFB_NUM_I2C]; | |
75b035ac | 35 | struct viafb_dev *i2c_vdev; /* Passed in from core */ |
f045f77b | 36 | |
9f291634 JC |
37 | static void via_i2c_setscl(void *data, int state) |
38 | { | |
39 | u8 val; | |
f045f77b | 40 | struct via_port_cfg *adap_data = data; |
75b035ac | 41 | unsigned long flags; |
9f291634 | 42 | |
75b035ac JC |
43 | spin_lock_irqsave(&i2c_vdev->reg_lock, flags); |
44 | val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0; | |
9f291634 JC |
45 | if (state) |
46 | val |= 0x20; | |
47 | else | |
48 | val &= ~0x20; | |
277d32a3 | 49 | switch (adap_data->type) { |
f045f77b | 50 | case VIA_PORT_I2C: |
9f291634 JC |
51 | val |= 0x01; |
52 | break; | |
f045f77b | 53 | case VIA_PORT_GPIO: |
9f291634 JC |
54 | val |= 0x80; |
55 | break; | |
56 | default: | |
4a28ea9c | 57 | printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n"); |
9f291634 | 58 | } |
75b035ac JC |
59 | via_write_reg(adap_data->io_port, adap_data->ioport_index, val); |
60 | spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags); | |
9f291634 JC |
61 | } |
62 | ||
63 | static int via_i2c_getscl(void *data) | |
64 | { | |
f045f77b | 65 | struct via_port_cfg *adap_data = data; |
75b035ac JC |
66 | unsigned long flags; |
67 | int ret = 0; | |
68 | ||
69 | spin_lock_irqsave(&i2c_vdev->reg_lock, flags); | |
70 | if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x08) | |
71 | ret = 1; | |
72 | spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags); | |
73 | return ret; | |
9f291634 JC |
74 | } |
75 | ||
76 | static int via_i2c_getsda(void *data) | |
77 | { | |
f045f77b | 78 | struct via_port_cfg *adap_data = data; |
75b035ac JC |
79 | unsigned long flags; |
80 | int ret = 0; | |
81 | ||
82 | spin_lock_irqsave(&i2c_vdev->reg_lock, flags); | |
83 | if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x04) | |
84 | ret = 1; | |
85 | spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags); | |
86 | return ret; | |
9f291634 JC |
87 | } |
88 | ||
89 | static void via_i2c_setsda(void *data, int state) | |
90 | { | |
91 | u8 val; | |
f045f77b | 92 | struct via_port_cfg *adap_data = data; |
75b035ac | 93 | unsigned long flags; |
9f291634 | 94 | |
75b035ac JC |
95 | spin_lock_irqsave(&i2c_vdev->reg_lock, flags); |
96 | val = via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0xF0; | |
9f291634 JC |
97 | if (state) |
98 | val |= 0x10; | |
99 | else | |
100 | val &= ~0x10; | |
277d32a3 | 101 | switch (adap_data->type) { |
f045f77b | 102 | case VIA_PORT_I2C: |
9f291634 JC |
103 | val |= 0x01; |
104 | break; | |
f045f77b | 105 | case VIA_PORT_GPIO: |
9f291634 JC |
106 | val |= 0x40; |
107 | break; | |
108 | default: | |
4a28ea9c | 109 | printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n"); |
9f291634 | 110 | } |
75b035ac JC |
111 | via_write_reg(adap_data->io_port, adap_data->ioport_index, val); |
112 | spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags); | |
9f291634 JC |
113 | } |
114 | ||
277d32a3 | 115 | int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata) |
9f291634 JC |
116 | { |
117 | u8 mm1[] = {0x00}; | |
118 | struct i2c_msg msgs[2]; | |
119 | ||
b052d7f8 JC |
120 | if (!via_i2c_par[adap].is_active) |
121 | return -ENODEV; | |
9f291634 JC |
122 | *pdata = 0; |
123 | msgs[0].flags = 0; | |
124 | msgs[1].flags = I2C_M_RD; | |
125 | msgs[0].addr = msgs[1].addr = slave_addr / 2; | |
126 | mm1[0] = index; | |
127 | msgs[0].len = 1; msgs[1].len = 1; | |
128 | msgs[0].buf = mm1; msgs[1].buf = pdata; | |
f045f77b | 129 | return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2); |
9f291634 JC |
130 | } |
131 | ||
277d32a3 | 132 | int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data) |
9f291634 JC |
133 | { |
134 | u8 msg[2] = { index, data }; | |
135 | struct i2c_msg msgs; | |
136 | ||
b052d7f8 JC |
137 | if (!via_i2c_par[adap].is_active) |
138 | return -ENODEV; | |
9f291634 JC |
139 | msgs.flags = 0; |
140 | msgs.addr = slave_addr / 2; | |
141 | msgs.len = 2; | |
142 | msgs.buf = msg; | |
f045f77b | 143 | return i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1); |
9f291634 JC |
144 | } |
145 | ||
277d32a3 | 146 | int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len) |
9f291634 JC |
147 | { |
148 | u8 mm1[] = {0x00}; | |
149 | struct i2c_msg msgs[2]; | |
150 | ||
b052d7f8 JC |
151 | if (!via_i2c_par[adap].is_active) |
152 | return -ENODEV; | |
9f291634 JC |
153 | msgs[0].flags = 0; |
154 | msgs[1].flags = I2C_M_RD; | |
155 | msgs[0].addr = msgs[1].addr = slave_addr / 2; | |
156 | mm1[0] = index; | |
157 | msgs[0].len = 1; msgs[1].len = buff_len; | |
158 | msgs[0].buf = mm1; msgs[1].buf = buff; | |
f045f77b | 159 | return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2); |
9f291634 JC |
160 | } |
161 | ||
b8f7e5d8 JC |
162 | /* |
163 | * Allow other viafb subdevices to look up a specific adapter | |
164 | * by port name. | |
165 | */ | |
166 | struct i2c_adapter *viafb_find_i2c_adapter(enum viafb_i2c_adap which) | |
167 | { | |
168 | struct via_i2c_stuff *stuff = &via_i2c_par[which]; | |
169 | ||
170 | return &stuff->adapter; | |
171 | } | |
172 | EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter); | |
173 | ||
174 | ||
277d32a3 HW |
175 | static int create_i2c_bus(struct i2c_adapter *adapter, |
176 | struct i2c_algo_bit_data *algo, | |
f045f77b | 177 | struct via_port_cfg *adap_cfg, |
277d32a3 | 178 | struct pci_dev *pdev) |
9f291634 | 179 | { |
277d32a3 HW |
180 | algo->setsda = via_i2c_setsda; |
181 | algo->setscl = via_i2c_setscl; | |
182 | algo->getsda = via_i2c_getsda; | |
183 | algo->getscl = via_i2c_getscl; | |
184 | algo->udelay = 40; | |
185 | algo->timeout = 20; | |
186 | algo->data = adap_cfg; | |
187 | ||
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; | |
194 | if (pdev) | |
195 | adapter->dev.parent = &pdev->dev; | |
196 | else | |
197 | adapter->dev.parent = NULL; | |
198 | /* i2c_set_adapdata(adapter, adap_cfg); */ | |
9f291634 JC |
199 | |
200 | /* Raise SCL and SDA */ | |
277d32a3 HW |
201 | via_i2c_setsda(adap_cfg, 1); |
202 | via_i2c_setscl(adap_cfg, 1); | |
9f291634 JC |
203 | udelay(20); |
204 | ||
277d32a3 HW |
205 | return i2c_bit_add_bus(adapter); |
206 | } | |
207 | ||
7582eb9b | 208 | static int viafb_i2c_probe(struct platform_device *platdev) |
277d32a3 HW |
209 | { |
210 | int i, ret; | |
7582eb9b JC |
211 | struct via_port_cfg *configs; |
212 | ||
213 | i2c_vdev = platdev->dev.platform_data; | |
214 | configs = i2c_vdev->port_cfg; | |
277d32a3 | 215 | |
f045f77b JC |
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]; | |
277d32a3 | 219 | |
b052d7f8 | 220 | i2c_stuff->is_active = 0; |
f045f77b | 221 | if (adap_cfg->type == 0 || adap_cfg->mode != VIA_MODE_I2C) |
4da62e6c | 222 | continue; |
277d32a3 HW |
223 | ret = create_i2c_bus(&i2c_stuff->adapter, |
224 | &i2c_stuff->algo, adap_cfg, | |
225 | NULL); /* FIXME: PCIDEV */ | |
226 | if (ret < 0) { | |
227 | printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n", | |
228 | i, ret); | |
b052d7f8 | 229 | continue; /* Still try to make the rest */ |
277d32a3 | 230 | } |
b052d7f8 | 231 | i2c_stuff->is_active = 1; |
277d32a3 HW |
232 | } |
233 | ||
234 | return 0; | |
9f291634 JC |
235 | } |
236 | ||
7582eb9b | 237 | static int viafb_i2c_remove(struct platform_device *platdev) |
9f291634 | 238 | { |
277d32a3 HW |
239 | int i; |
240 | ||
f045f77b JC |
241 | for (i = 0; i < VIAFB_NUM_PORTS; i++) { |
242 | struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i]; | |
243 | /* | |
244 | * Only remove those entries in the array that we've | |
245 | * actually used (and thus initialized algo_data) | |
246 | */ | |
b052d7f8 | 247 | if (i2c_stuff->is_active) |
277d32a3 HW |
248 | i2c_del_adapter(&i2c_stuff->adapter); |
249 | } | |
7582eb9b JC |
250 | return 0; |
251 | } | |
252 | ||
253 | static struct platform_driver via_i2c_driver = { | |
254 | .driver = { | |
255 | .name = "viafb-i2c", | |
256 | }, | |
257 | .probe = viafb_i2c_probe, | |
258 | .remove = viafb_i2c_remove, | |
259 | }; | |
260 | ||
261 | int viafb_i2c_init(void) | |
262 | { | |
263 | return platform_driver_register(&via_i2c_driver); | |
264 | } | |
265 | ||
266 | void viafb_i2c_exit(void) | |
267 | { | |
268 | platform_driver_unregister(&via_i2c_driver); | |
9f291634 | 269 | } |