1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *
4 * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200, G400 and G450.
5 *
6 * (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
7 *
8 * Version: 1.64 2002/06/10
9 *
10 * See matroxfb_base.c for contributors.
11 *
12 */
13
14#include "matroxfb_base.h"
15#include "matroxfb_maven.h"
16#include <linux/i2c.h>
17#include <linux/slab.h>
18#include <linux/i2c-algo-bit.h>
19
20/* MGA-TVO I2C for G200, G400 */
21#define MAT_CLK 0x20
22#define MAT_DATA 0x10
23/* primary head DDC for Mystique(?), G100, G200, G400 */
24#define DDC1_CLK 0x08
25#define DDC1_DATA 0x02
26/* primary head DDC for Millennium, Millennium II */
27#define DDC1B_CLK 0x10
28#define DDC1B_DATA 0x04
29/* secondary head DDC for G400 */
30#define DDC2_CLK 0x04
31#define DDC2_DATA 0x01
32
33/******************************************************/
34
35struct matroxfb_dh_maven_info {
36 struct i2c_bit_adapter maven;
37 struct i2c_bit_adapter ddc1;
38 struct i2c_bit_adapter ddc2;
39};
40
41static int matroxfb_read_gpio(struct matrox_fb_info* minfo) {
42 unsigned long flags;
43 int v;
44
45 matroxfb_DAC_lock_irqsave(flags);
46 v = matroxfb_DAC_in(minfo, DAC_XGENIODATA);
47 matroxfb_DAC_unlock_irqrestore(flags);
48 return v;
49}
50
51static void matroxfb_set_gpio(struct matrox_fb_info* minfo, int mask, int val) {
52 unsigned long flags;
53 int v;
54
55 matroxfb_DAC_lock_irqsave(flags);
56 v = (matroxfb_DAC_in(minfo, DAC_XGENIOCTRL) & mask) | val;
57 matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, val: v);
58 /* We must reset GENIODATA very often... XFree plays with this register */
59 matroxfb_DAC_out(minfo, DAC_XGENIODATA, val: 0x00);
60 matroxfb_DAC_unlock_irqrestore(flags);
61}
62
63/* software I2C functions */
64static inline void matroxfb_i2c_set(struct matrox_fb_info* minfo, int mask, int state) {
65 if (state)
66 state = 0;
67 else
68 state = mask;
69 matroxfb_set_gpio(minfo, mask: ~mask, val: state);
70}
71
72static void matroxfb_gpio_setsda(void* data, int state) {
73 struct i2c_bit_adapter* b = data;
74 matroxfb_i2c_set(minfo: b->minfo, mask: b->mask.data, state);
75}
76
77static void matroxfb_gpio_setscl(void* data, int state) {
78 struct i2c_bit_adapter* b = data;
79 matroxfb_i2c_set(minfo: b->minfo, mask: b->mask.clock, state);
80}
81
82static int matroxfb_gpio_getsda(void* data) {
83 struct i2c_bit_adapter* b = data;
84 return (matroxfb_read_gpio(minfo: b->minfo) & b->mask.data) ? 1 : 0;
85}
86
87static int matroxfb_gpio_getscl(void* data) {
88 struct i2c_bit_adapter* b = data;
89 return (matroxfb_read_gpio(minfo: b->minfo) & b->mask.clock) ? 1 : 0;
90}
91
92static const struct i2c_algo_bit_data matrox_i2c_algo_template =
93{
94 .setsda = matroxfb_gpio_setsda,
95 .setscl = matroxfb_gpio_setscl,
96 .getsda = matroxfb_gpio_getsda,
97 .getscl = matroxfb_gpio_getscl,
98 .udelay = 10,
99 .timeout = 100,
100};
101
102static int i2c_bus_reg(struct i2c_bit_adapter* b, struct matrox_fb_info* minfo,
103 unsigned int data, unsigned int clock, const char *name)
104{
105 int err;
106
107 b->minfo = minfo;
108 b->mask.data = data;
109 b->mask.clock = clock;
110 b->adapter.owner = THIS_MODULE;
111 snprintf(buf: b->adapter.name, size: sizeof(b->adapter.name), fmt: name,
112 minfo->fbcon.node);
113 i2c_set_adapdata(adap: &b->adapter, data: b);
114 b->adapter.algo_data = &b->bac;
115 b->adapter.dev.parent = &minfo->pcidev->dev;
116 b->bac = matrox_i2c_algo_template;
117 b->bac.data = b;
118 err = i2c_bit_add_bus(&b->adapter);
119 b->initialized = !err;
120 return err;
121}
122
123static void i2c_bit_bus_del(struct i2c_bit_adapter* b) {
124 if (b->initialized) {
125 i2c_del_adapter(adap: &b->adapter);
126 b->initialized = 0;
127 }
128}
129
130static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) {
131 i2c_bit_bus_del(b: &minfo2->maven);
132}
133
134static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) {
135 i2c_bit_bus_del(b: &minfo2->ddc1);
136}
137
138static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) {
139 i2c_bit_bus_del(b: &minfo2->ddc2);
140}
141
142static void* i2c_matroxfb_probe(struct matrox_fb_info* minfo) {
143 int err;
144 unsigned long flags;
145 struct matroxfb_dh_maven_info* m2info;
146
147 m2info = kzalloc(size: sizeof(*m2info), GFP_KERNEL);
148 if (!m2info)
149 return NULL;
150
151 matroxfb_DAC_lock_irqsave(flags);
152 matroxfb_DAC_out(minfo, DAC_XGENIODATA, val: 0xFF);
153 matroxfb_DAC_out(minfo, DAC_XGENIOCTRL, val: 0x00);
154 matroxfb_DAC_unlock_irqrestore(flags);
155
156 switch (minfo->chip) {
157 case MGA_2064:
158 case MGA_2164:
159 err = i2c_bus_reg(b: &m2info->ddc1, minfo,
160 DDC1B_DATA, DDC1B_CLK,
161 name: "DDC:fb%u #0");
162 break;
163 default:
164 err = i2c_bus_reg(b: &m2info->ddc1, minfo,
165 DDC1_DATA, DDC1_CLK,
166 name: "DDC:fb%u #0");
167 break;
168 }
169 if (err)
170 goto fail_ddc1;
171 if (minfo->devflags.dualhead) {
172 err = i2c_bus_reg(b: &m2info->ddc2, minfo, DDC2_DATA, DDC2_CLK, name: "DDC:fb%u #1");
173 if (err == -ENODEV) {
174 printk(KERN_INFO "i2c-matroxfb: VGA->TV plug detected, DDC unavailable.\n");
175 } else if (err)
176 printk(KERN_INFO "i2c-matroxfb: Could not register secondary output i2c bus. Continuing anyway.\n");
177 /* Register maven bus even on G450/G550 */
178 err = i2c_bus_reg(b: &m2info->maven, minfo, MAT_DATA, MAT_CLK, name: "MAVEN:fb%u");
179 if (err)
180 printk(KERN_INFO "i2c-matroxfb: Could not register Maven i2c bus. Continuing anyway.\n");
181 else {
182 struct i2c_board_info maven_info = {
183 I2C_BOARD_INFO("maven", 0x1b),
184 };
185 unsigned short const addr_list[2] = {
186 0x1b, I2C_CLIENT_END
187 };
188
189 i2c_new_scanned_device(adap: &m2info->maven.adapter,
190 info: &maven_info, addr_list, NULL);
191 }
192 }
193 return m2info;
194fail_ddc1:;
195 kfree(objp: m2info);
196 printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n");
197 return NULL;
198}
199
200static void i2c_matroxfb_remove(struct matrox_fb_info* minfo, void* data) {
201 struct matroxfb_dh_maven_info* m2info = data;
202
203 i2c_maven_done(minfo2: m2info);
204 i2c_ddc2_done(minfo2: m2info);
205 i2c_ddc1_done(minfo2: m2info);
206 kfree(objp: m2info);
207}
208
209static struct matroxfb_driver i2c_matroxfb = {
210 .node = LIST_HEAD_INIT(i2c_matroxfb.node),
211 .name = "i2c-matroxfb",
212 .probe = i2c_matroxfb_probe,
213 .remove = i2c_matroxfb_remove,
214};
215
216static int __init i2c_matroxfb_init(void) {
217 if (matroxfb_register_driver(drv: &i2c_matroxfb)) {
218 printk(KERN_ERR "i2c-matroxfb: failed to register driver\n");
219 return -ENXIO;
220 }
221 return 0;
222}
223
224static void __exit i2c_matroxfb_exit(void) {
225 matroxfb_unregister_driver(drv: &i2c_matroxfb);
226}
227
228MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
229MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards");
230
231module_init(i2c_matroxfb_init);
232module_exit(i2c_matroxfb_exit);
233/* no __setup required */
234MODULE_LICENSE("GPL");
235

source code of linux/drivers/video/fbdev/matrox/i2c-matroxfb.c