1 /*
2 * Copyright 2012 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sub license, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
15 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
18 * USE OR OTHER DEALINGS IN THE SOFTWARE.
19 *
20 * The above copyright notice and this permission notice (including the
21 * next paragraph) shall be included in all copies or substantial portions
22 * of the Software.
23 *
24 */
25 /*
26 * Authors: Dave Airlie <airlied@redhat.com>
27 */
28
29 #include <linux/export.h>
30 #include <linux/i2c-algo-bit.h>
31 #include <linux/i2c.h>
32 #include <linux/pci.h>
33
34 #include "mgag200_drv.h"
35
mga_i2c_read_gpio(struct mga_device * mdev)36 static int mga_i2c_read_gpio(struct mga_device *mdev)
37 {
38 WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
39 return RREG8(DAC_DATA);
40 }
41
mga_i2c_set_gpio(struct mga_device * mdev,int mask,int val)42 static void mga_i2c_set_gpio(struct mga_device *mdev, int mask, int val)
43 {
44 int tmp;
45
46 WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL);
47 tmp = (RREG8(DAC_DATA) & mask) | val;
48 WREG_DAC(MGA1064_GEN_IO_CTL, tmp);
49 WREG_DAC(MGA1064_GEN_IO_DATA, 0);
50 }
51
mga_i2c_set(struct mga_device * mdev,int mask,int state)52 static inline void mga_i2c_set(struct mga_device *mdev, int mask, int state)
53 {
54 if (state)
55 state = 0;
56 else
57 state = mask;
58 mga_i2c_set_gpio(mdev, ~mask, state);
59 }
60
mga_gpio_setsda(void * data,int state)61 static void mga_gpio_setsda(void *data, int state)
62 {
63 struct mga_i2c_chan *i2c = data;
64 struct mga_device *mdev = to_mga_device(i2c->dev);
65 mga_i2c_set(mdev, i2c->data, state);
66 }
67
mga_gpio_setscl(void * data,int state)68 static void mga_gpio_setscl(void *data, int state)
69 {
70 struct mga_i2c_chan *i2c = data;
71 struct mga_device *mdev = to_mga_device(i2c->dev);
72 mga_i2c_set(mdev, i2c->clock, state);
73 }
74
mga_gpio_getsda(void * data)75 static int mga_gpio_getsda(void *data)
76 {
77 struct mga_i2c_chan *i2c = data;
78 struct mga_device *mdev = to_mga_device(i2c->dev);
79 return (mga_i2c_read_gpio(mdev) & i2c->data) ? 1 : 0;
80 }
81
mga_gpio_getscl(void * data)82 static int mga_gpio_getscl(void *data)
83 {
84 struct mga_i2c_chan *i2c = data;
85 struct mga_device *mdev = to_mga_device(i2c->dev);
86 return (mga_i2c_read_gpio(mdev) & i2c->clock) ? 1 : 0;
87 }
88
mgag200_i2c_create(struct drm_device * dev)89 struct mga_i2c_chan *mgag200_i2c_create(struct drm_device *dev)
90 {
91 struct mga_device *mdev = to_mga_device(dev);
92 struct mga_i2c_chan *i2c;
93 int ret;
94 int data, clock;
95
96 WREG_DAC(MGA1064_GEN_IO_CTL2, 1);
97 WREG_DAC(MGA1064_GEN_IO_DATA, 0xff);
98 WREG_DAC(MGA1064_GEN_IO_CTL, 0);
99
100 switch (mdev->type) {
101 case G200_SE_A:
102 case G200_SE_B:
103 case G200_EV:
104 case G200_WB:
105 case G200_EW3:
106 data = 1;
107 clock = 2;
108 break;
109 case G200_EH:
110 case G200_EH3:
111 case G200_ER:
112 data = 2;
113 clock = 1;
114 break;
115 default:
116 data = 2;
117 clock = 8;
118 break;
119 }
120
121 i2c = kzalloc(sizeof(struct mga_i2c_chan), GFP_KERNEL);
122 if (!i2c)
123 return NULL;
124
125 i2c->data = data;
126 i2c->clock = clock;
127 i2c->adapter.owner = THIS_MODULE;
128 i2c->adapter.class = I2C_CLASS_DDC;
129 i2c->adapter.dev.parent = dev->dev;
130 i2c->dev = dev;
131 i2c_set_adapdata(&i2c->adapter, i2c);
132 snprintf(i2c->adapter.name, sizeof(i2c->adapter.name), "mga i2c");
133
134 i2c->adapter.algo_data = &i2c->bit;
135
136 i2c->bit.udelay = 10;
137 i2c->bit.timeout = 2;
138 i2c->bit.data = i2c;
139 i2c->bit.setsda = mga_gpio_setsda;
140 i2c->bit.setscl = mga_gpio_setscl;
141 i2c->bit.getsda = mga_gpio_getsda;
142 i2c->bit.getscl = mga_gpio_getscl;
143
144 ret = i2c_bit_add_bus(&i2c->adapter);
145 if (ret) {
146 kfree(i2c);
147 i2c = NULL;
148 }
149 return i2c;
150 }
151
mgag200_i2c_destroy(struct mga_i2c_chan * i2c)152 void mgag200_i2c_destroy(struct mga_i2c_chan *i2c)
153 {
154 if (!i2c)
155 return;
156 i2c_del_adapter(&i2c->adapter);
157 kfree(i2c);
158 }
159
160