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path: root/drivers/video/fbdev/intelfb/intelfb_i2c.c
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Diffstat (limited to 'drivers/video/fbdev/intelfb/intelfb_i2c.c')
-rw-r--r--drivers/video/fbdev/intelfb/intelfb_i2c.c209
1 files changed, 209 insertions, 0 deletions
diff --git a/drivers/video/fbdev/intelfb/intelfb_i2c.c b/drivers/video/fbdev/intelfb/intelfb_i2c.c
new file mode 100644
index 000000000000..3300bd31d9d7
--- /dev/null
+++ b/drivers/video/fbdev/intelfb/intelfb_i2c.c
@@ -0,0 +1,209 @@
1/**************************************************************************
2
3 Copyright 2006 Dave Airlie <airlied@linux.ie>
4
5All Rights Reserved.
6
7Permission is hereby granted, free of charge, to any person obtaining a
8copy of this software and associated documentation files (the "Software"),
9to deal in the Software without restriction, including without limitation
10on the rights to use, copy, modify, merge, publish, distribute, sub
11license, and/or sell copies of the Software, and to permit persons to whom
12the Software is furnished to do so, subject to the following conditions:
13
14The above copyright notice and this permission notice (including the next
15paragraph) shall be included in all copies or substantial portions of the
16Software.
17
18THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
22DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24USE OR OTHER DEALINGS IN THE SOFTWARE.
25
26**************************************************************************/
27
28#include <linux/module.h>
29#include <linux/kernel.h>
30#include <linux/delay.h>
31#include <linux/pci.h>
32#include <linux/fb.h>
33
34#include <linux/i2c.h>
35#include <linux/i2c-algo-bit.h>
36
37#include <asm/io.h>
38
39#include "intelfb.h"
40#include "intelfbhw.h"
41
42/* bit locations in the registers */
43#define SCL_DIR_MASK 0x0001
44#define SCL_DIR 0x0002
45#define SCL_VAL_MASK 0x0004
46#define SCL_VAL_OUT 0x0008
47#define SCL_VAL_IN 0x0010
48#define SDA_DIR_MASK 0x0100
49#define SDA_DIR 0x0200
50#define SDA_VAL_MASK 0x0400
51#define SDA_VAL_OUT 0x0800
52#define SDA_VAL_IN 0x1000
53
54static void intelfb_gpio_setscl(void *data, int state)
55{
56 struct intelfb_i2c_chan *chan = data;
57 struct intelfb_info *dinfo = chan->dinfo;
58 u32 val;
59
60 OUTREG(chan->reg, (state ? SCL_VAL_OUT : 0) |
61 SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK);
62 val = INREG(chan->reg);
63}
64
65static void intelfb_gpio_setsda(void *data, int state)
66{
67 struct intelfb_i2c_chan *chan = data;
68 struct intelfb_info *dinfo = chan->dinfo;
69 u32 val;
70
71 OUTREG(chan->reg, (state ? SDA_VAL_OUT : 0) |
72 SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK);
73 val = INREG(chan->reg);
74}
75
76static int intelfb_gpio_getscl(void *data)
77{
78 struct intelfb_i2c_chan *chan = data;
79 struct intelfb_info *dinfo = chan->dinfo;
80 u32 val;
81
82 OUTREG(chan->reg, SCL_DIR_MASK);
83 OUTREG(chan->reg, 0);
84 val = INREG(chan->reg);
85 return ((val & SCL_VAL_IN) != 0);
86}
87
88static int intelfb_gpio_getsda(void *data)
89{
90 struct intelfb_i2c_chan *chan = data;
91 struct intelfb_info *dinfo = chan->dinfo;
92 u32 val;
93
94 OUTREG(chan->reg, SDA_DIR_MASK);
95 OUTREG(chan->reg, 0);
96 val = INREG(chan->reg);
97 return ((val & SDA_VAL_IN) != 0);
98}
99
100static int intelfb_setup_i2c_bus(struct intelfb_info *dinfo,
101 struct intelfb_i2c_chan *chan,
102 const u32 reg, const char *name,
103 int class)
104{
105 int rc;
106
107 chan->dinfo = dinfo;
108 chan->reg = reg;
109 snprintf(chan->adapter.name, sizeof(chan->adapter.name),
110 "intelfb %s", name);
111 chan->adapter.class = class;
112 chan->adapter.owner = THIS_MODULE;
113 chan->adapter.algo_data = &chan->algo;
114 chan->adapter.dev.parent = &chan->dinfo->pdev->dev;
115 chan->algo.setsda = intelfb_gpio_setsda;
116 chan->algo.setscl = intelfb_gpio_setscl;
117 chan->algo.getsda = intelfb_gpio_getsda;
118 chan->algo.getscl = intelfb_gpio_getscl;
119 chan->algo.udelay = 40;
120 chan->algo.timeout = 20;
121 chan->algo.data = chan;
122
123 i2c_set_adapdata(&chan->adapter, chan);
124
125 /* Raise SCL and SDA */
126 intelfb_gpio_setsda(chan, 1);
127 intelfb_gpio_setscl(chan, 1);
128 udelay(20);
129
130 rc = i2c_bit_add_bus(&chan->adapter);
131 if (rc == 0)
132 DBG_MSG("I2C bus %s registered.\n", name);
133 else
134 WRN_MSG("Failed to register I2C bus %s.\n", name);
135 return rc;
136}
137
138void intelfb_create_i2c_busses(struct intelfb_info *dinfo)
139{
140 int i = 0;
141
142 /* everyone has at least a single analog output */
143 dinfo->num_outputs = 1;
144 dinfo->output[i].type = INTELFB_OUTPUT_ANALOG;
145
146 /* setup the DDC bus for analog output */
147 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOA,
148 "CRTDDC_A", I2C_CLASS_DDC);
149 i++;
150
151 /* need to add the output busses for each device
152 - this function is very incomplete
153 - i915GM has LVDS and TVOUT for example
154 */
155 switch(dinfo->chipset) {
156 case INTEL_830M:
157 case INTEL_845G:
158 case INTEL_854:
159 case INTEL_855GM:
160 case INTEL_865G:
161 dinfo->output[i].type = INTELFB_OUTPUT_DVO;
162 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus,
163 GPIOD, "DVODDC_D", I2C_CLASS_DDC);
164 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
165 GPIOE, "DVOI2C_E", 0);
166 i++;
167 break;
168 case INTEL_915G:
169 case INTEL_915GM:
170 /* has some LVDS + tv-out */
171 case INTEL_945G:
172 case INTEL_945GM:
173 case INTEL_945GME:
174 case INTEL_965G:
175 case INTEL_965GM:
176 /* SDVO ports have a single control bus - 2 devices */
177 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
178 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
179 GPIOE, "SDVOCTRL_E", 0);
180 /* TODO: initialize the SDVO */
181 /* I830SDVOInit(pScrn, i, DVOB); */
182 i++;
183
184 /* set up SDVOC */
185 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
186 dinfo->output[i].i2c_bus = dinfo->output[i - 1].i2c_bus;
187 /* TODO: initialize the SDVO */
188 /* I830SDVOInit(pScrn, i, DVOC); */
189 i++;
190 break;
191 }
192 dinfo->num_outputs = i;
193}
194
195void intelfb_delete_i2c_busses(struct intelfb_info *dinfo)
196{
197 int i;
198
199 for (i = 0; i < MAX_OUTPUTS; i++) {
200 if (dinfo->output[i].i2c_bus.dinfo) {
201 i2c_del_adapter(&dinfo->output[i].i2c_bus.adapter);
202 dinfo->output[i].i2c_bus.dinfo = NULL;
203 }
204 if (dinfo->output[i].ddc_bus.dinfo) {
205 i2c_del_adapter(&dinfo->output[i].ddc_bus.adapter);
206 dinfo->output[i].ddc_bus.dinfo = NULL;
207 }
208 }
209}
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