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 | |
35 | struct matroxfb_dh_maven_info { |
36 | struct i2c_bit_adapter maven; |
37 | struct i2c_bit_adapter ddc1; |
38 | struct i2c_bit_adapter ddc2; |
39 | }; |
40 | |
41 | static 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 | |
51 | static 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 */ |
64 | static 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 | |
72 | static 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 | |
77 | static 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 | |
82 | static 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 | |
87 | static 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 | |
92 | static 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 | |
102 | static 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 | |
123 | static 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 | |
130 | static inline void i2c_maven_done(struct matroxfb_dh_maven_info* minfo2) { |
131 | i2c_bit_bus_del(b: &minfo2->maven); |
132 | } |
133 | |
134 | static inline void i2c_ddc1_done(struct matroxfb_dh_maven_info* minfo2) { |
135 | i2c_bit_bus_del(b: &minfo2->ddc1); |
136 | } |
137 | |
138 | static inline void i2c_ddc2_done(struct matroxfb_dh_maven_info* minfo2) { |
139 | i2c_bit_bus_del(b: &minfo2->ddc2); |
140 | } |
141 | |
142 | static 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; |
194 | fail_ddc1:; |
195 | kfree(objp: m2info); |
196 | printk(KERN_ERR "i2c-matroxfb: Could not register primary adapter DDC bus.\n" ); |
197 | return NULL; |
198 | } |
199 | |
200 | static 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 | |
209 | static 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 | |
216 | static 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 | |
224 | static void __exit i2c_matroxfb_exit(void) { |
225 | matroxfb_unregister_driver(drv: &i2c_matroxfb); |
226 | } |
227 | |
228 | MODULE_AUTHOR("(c) 1999-2002 Petr Vandrovec <vandrove@vc.cvut.cz>" ); |
229 | MODULE_DESCRIPTION("Support module providing I2C buses present on Matrox videocards" ); |
230 | |
231 | module_init(i2c_matroxfb_init); |
232 | module_exit(i2c_matroxfb_exit); |
233 | /* no __setup required */ |
234 | MODULE_LICENSE("GPL" ); |
235 | |