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Diffstat (limited to 'drivers/video/intelfb/intelfb_i2c.c')
-rw-r--r--drivers/video/intelfb/intelfb_i2c.c200
1 files changed, 200 insertions, 0 deletions
diff --git a/drivers/video/intelfb/intelfb_i2c.c b/drivers/video/intelfb/intelfb_i2c.c
new file mode 100644
index 000000000000..c1113d6e941d
--- /dev/null
+++ b/drivers/video/intelfb/intelfb_i2c.c
@@ -0,0 +1,200 @@
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/config.h>
29#include <linux/module.h>
30#include <linux/kernel.h>
31#include <linux/sched.h>
32#include <linux/delay.h>
33#include <linux/pci.h>
34#include <linux/fb.h>
35
36#include <linux/i2c.h>
37#include <linux/i2c-id.h>
38#include <linux/i2c-algo-bit.h>
39
40#include <asm/io.h>
41
42#include "intelfb.h"
43#include "intelfbhw.h"
44
45/* bit locations in the registers */
46#define SCL_DIR_MASK 0x0001
47#define SCL_DIR 0x0002
48#define SCL_VAL_MASK 0x0004
49#define SCL_VAL_OUT 0x0008
50#define SCL_VAL_IN 0x0010
51#define SDA_DIR_MASK 0x0100
52#define SDA_DIR 0x0200
53#define SDA_VAL_MASK 0x0400
54#define SDA_VAL_OUT 0x0800
55#define SDA_VAL_IN 0x1000
56
57static void intelfb_gpio_setscl(void *data, int state)
58{
59 struct intelfb_i2c_chan *chan = data;
60 struct intelfb_info *dinfo = chan->dinfo;
61 u32 val;
62
63 OUTREG(chan->reg, (state ? SCL_VAL_OUT : 0) | SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK);
64 val = INREG(chan->reg);
65}
66
67static void intelfb_gpio_setsda(void *data, int state)
68{
69 struct intelfb_i2c_chan *chan = data;
70 struct intelfb_info *dinfo = chan->dinfo;
71 u32 val;
72
73 OUTREG(chan->reg, (state ? SDA_VAL_OUT : 0) | SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK);
74 val = INREG(chan->reg);
75}
76
77static int intelfb_gpio_getscl(void *data)
78{
79 struct intelfb_i2c_chan *chan = data;
80 struct intelfb_info *dinfo = chan->dinfo;
81 u32 val;
82
83 OUTREG(chan->reg, SCL_DIR_MASK);
84 OUTREG(chan->reg, 0);
85 val = INREG(chan->reg);
86 return ((val & SCL_VAL_IN) != 0);
87}
88
89static int intelfb_gpio_getsda(void *data)
90{
91 struct intelfb_i2c_chan *chan = data;
92 struct intelfb_info *dinfo = chan->dinfo;
93 u32 val;
94
95 OUTREG(chan->reg, SDA_DIR_MASK);
96 OUTREG(chan->reg, 0);
97 val = INREG(chan->reg);
98 return ((val & SDA_VAL_IN) != 0);
99}
100
101static int intelfb_setup_i2c_bus(struct intelfb_info *dinfo,
102 struct intelfb_i2c_chan *chan,
103 const u32 reg, const char *name)
104{
105 int rc;
106
107 chan->dinfo = dinfo;
108 chan->reg = reg;
109 snprintf(chan->adapter.name, I2C_NAME_SIZE, "intelfb %s", name);
110 chan->adapter.owner = THIS_MODULE;
111 chan->adapter.id = I2C_HW_B_INTELFB;
112 chan->adapter.algo_data = &chan->algo;
113 chan->adapter.dev.parent = &chan->dinfo->pdev->dev;
114 chan->algo.setsda = intelfb_gpio_setsda;
115 chan->algo.setscl = intelfb_gpio_setscl;
116 chan->algo.getsda = intelfb_gpio_getsda;
117 chan->algo.getscl = intelfb_gpio_getscl;
118 chan->algo.udelay = 40;
119 chan->algo.timeout = 20;
120 chan->algo.data = chan;
121
122 i2c_set_adapdata(&chan->adapter, chan);
123
124 /* Raise SCL and SDA */
125 intelfb_gpio_setsda(chan, 1);
126 intelfb_gpio_setscl(chan, 1);
127 udelay(20);
128
129 rc = i2c_bit_add_bus(&chan->adapter);
130 if (rc == 0)
131 DBG_MSG("I2C bus %s registered.\n", name);
132 else
133 WRN_MSG("Failed to register I2C bus %s.\n", name);
134 return rc;
135}
136
137void intelfb_create_i2c_busses(struct intelfb_info *dinfo)
138{
139 int i = 0;
140
141 /* everyone has at least a single analog output */
142 dinfo->num_outputs = 1;
143 dinfo->output[i].type = INTELFB_OUTPUT_ANALOG;
144
145 /* setup the DDC bus for analog output */
146 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOA, "CRTDDC_A");
147 i++;
148
149 /* need to add the output busses for each device
150 - this function is very incomplete
151 - i915GM has LVDS and TVOUT for example
152 */
153 switch(dinfo->chipset) {
154 case INTEL_830M:
155 case INTEL_845G:
156 case INTEL_855GM:
157 case INTEL_865G:
158 dinfo->output[i].type = INTELFB_OUTPUT_DVO;
159 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOD, "DVODDC_D");
160 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus, GPIOE, "DVOI2C_E");
161 i++;
162 break;
163 case INTEL_915G:
164 case INTEL_915GM:
165 /* has some LVDS + tv-out */
166 case INTEL_945G:
167 case INTEL_945GM:
168 /* SDVO ports have a single control bus - 2 devices */
169 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
170 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus, GPIOE, "SDVOCTRL_E");
171 /* TODO: initialize the SDVO */
172// I830SDVOInit(pScrn, i, DVOB);
173 i++;
174
175 /* set up SDVOC */
176 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
177 dinfo->output[i].i2c_bus = dinfo->output[i - 1].i2c_bus;
178 /* TODO: initialize the SDVO */
179// I830SDVOInit(pScrn, i, DVOC);
180 i++;
181 break;
182 }
183 dinfo->num_outputs = i;
184}
185
186void intelfb_delete_i2c_busses(struct intelfb_info *dinfo)
187{
188 int i;
189
190 for (i = 0; i < MAX_OUTPUTS; i++) {
191 if (dinfo->output[i].i2c_bus.dinfo) {
192 i2c_bit_del_bus(&dinfo->output[i].i2c_bus.adapter);
193 dinfo->output[i].i2c_bus.dinfo = NULL;
194 }
195 if (dinfo->output[i].ddc_bus.dinfo) {
196 i2c_bit_del_bus(&dinfo->output[i].ddc_bus.adapter);
197 dinfo->output[i].ddc_bus.dinfo = NULL;
198 }
199 }
200}
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