i2c: Let framebuffer drivers set their I2C bus class to DDC
[linux-2.6.git] / drivers / video / intelfb / intelfb_i2c.c
1 /**************************************************************************
2
3  Copyright 2006 Dave Airlie <airlied@linux.ie>
4
5 All Rights Reserved.
6
7 Permission is hereby granted, free of charge, to any person obtaining a
8 copy of this software and associated documentation files (the "Software"),
9 to deal in the Software without restriction, including without limitation
10 on the rights to use, copy, modify, merge, publish, distribute, sub
11 license, and/or sell copies of the Software, and to permit persons to whom
12 the Software is furnished to do so, subject to the following conditions:
13
14 The above copyright notice and this permission notice (including the next
15 paragraph) shall be included in all copies or substantial portions of the
16 Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 USE 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-id.h>
36 #include <linux/i2c-algo-bit.h>
37
38 #include <asm/io.h>
39
40 #include "intelfb.h"
41 #include "intelfbhw.h"
42
43 /* bit locations in the registers */
44 #define SCL_DIR_MASK            0x0001
45 #define SCL_DIR                 0x0002
46 #define SCL_VAL_MASK            0x0004
47 #define SCL_VAL_OUT             0x0008
48 #define SCL_VAL_IN              0x0010
49 #define SDA_DIR_MASK            0x0100
50 #define SDA_DIR                 0x0200
51 #define SDA_VAL_MASK            0x0400
52 #define SDA_VAL_OUT             0x0800
53 #define SDA_VAL_IN              0x1000
54
55 static void intelfb_gpio_setscl(void *data, int state)
56 {
57         struct intelfb_i2c_chan *chan = data;
58         struct intelfb_info *dinfo = chan->dinfo;
59         u32 val;
60
61         OUTREG(chan->reg, (state ? SCL_VAL_OUT : 0) |
62                SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK);
63         val = INREG(chan->reg);
64 }
65
66 static void intelfb_gpio_setsda(void *data, int state)
67 {
68         struct intelfb_i2c_chan *chan = data;
69         struct intelfb_info *dinfo = chan->dinfo;
70         u32 val;
71
72         OUTREG(chan->reg, (state ? SDA_VAL_OUT : 0) |
73                SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK);
74         val = INREG(chan->reg);
75 }
76
77 static 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
89 static 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
101 static int intelfb_setup_i2c_bus(struct intelfb_info *dinfo,
102                                  struct intelfb_i2c_chan *chan,
103                                  const u32 reg, const char *name,
104                                  int class)
105 {
106         int rc;
107
108         chan->dinfo                     = dinfo;
109         chan->reg                       = reg;
110         snprintf(chan->adapter.name, sizeof(chan->adapter.name),
111                  "intelfb %s", name);
112         chan->adapter.class             = class;
113         chan->adapter.owner             = THIS_MODULE;
114         chan->adapter.id                = I2C_HW_B_INTELFB;
115         chan->adapter.algo_data         = &chan->algo;
116         chan->adapter.dev.parent        = &chan->dinfo->pdev->dev;
117         chan->algo.setsda               = intelfb_gpio_setsda;
118         chan->algo.setscl               = intelfb_gpio_setscl;
119         chan->algo.getsda               = intelfb_gpio_getsda;
120         chan->algo.getscl               = intelfb_gpio_getscl;
121         chan->algo.udelay               = 40;
122         chan->algo.timeout              = 20;
123         chan->algo.data                 = chan;
124
125         i2c_set_adapdata(&chan->adapter, chan);
126
127         /* Raise SCL and SDA */
128         intelfb_gpio_setsda(chan, 1);
129         intelfb_gpio_setscl(chan, 1);
130         udelay(20);
131
132         rc = i2c_bit_add_bus(&chan->adapter);
133         if (rc == 0)
134                 DBG_MSG("I2C bus %s registered.\n", name);
135         else
136                 WRN_MSG("Failed to register I2C bus %s.\n", name);
137         return rc;
138 }
139
140 void intelfb_create_i2c_busses(struct intelfb_info *dinfo)
141 {
142         int i = 0;
143
144         /* everyone has at least a single analog output */
145         dinfo->num_outputs = 1;
146         dinfo->output[i].type = INTELFB_OUTPUT_ANALOG;
147
148         /* setup the DDC bus for analog output */
149         intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOA,
150                               "CRTDDC_A", I2C_CLASS_DDC);
151         i++;
152
153         /* need to add the output busses for each device
154            - this function is very incomplete
155            - i915GM has LVDS and TVOUT for example
156         */
157         switch(dinfo->chipset) {
158         case INTEL_830M:
159         case INTEL_845G:
160         case INTEL_855GM:
161         case INTEL_865G:
162                 dinfo->output[i].type = INTELFB_OUTPUT_DVO;
163                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus,
164                                       GPIOD, "DVODDC_D", I2C_CLASS_DDC);
165                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
166                                       GPIOE, "DVOI2C_E", 0);
167                 i++;
168                 break;
169         case INTEL_915G:
170         case INTEL_915GM:
171                 /* has some LVDS + tv-out */
172         case INTEL_945G:
173         case INTEL_945GM:
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
195 void 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 }