[PATCH] remove many unneeded #includes of sched.h
[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) | SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK);
62         val = INREG(chan->reg);
63 }
64
65 static 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) | SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK);
72         val = INREG(chan->reg);
73 }
74
75 static int intelfb_gpio_getscl(void *data)
76 {
77         struct intelfb_i2c_chan *chan = data;
78         struct intelfb_info *dinfo = chan->dinfo;
79         u32 val;
80
81         OUTREG(chan->reg, SCL_DIR_MASK);
82         OUTREG(chan->reg, 0);
83         val = INREG(chan->reg);
84         return ((val & SCL_VAL_IN) != 0);
85 }
86
87 static int intelfb_gpio_getsda(void *data)
88 {
89         struct intelfb_i2c_chan *chan = data;
90         struct intelfb_info *dinfo = chan->dinfo;
91         u32 val;
92
93         OUTREG(chan->reg, SDA_DIR_MASK);
94         OUTREG(chan->reg, 0);
95         val = INREG(chan->reg);
96         return ((val & SDA_VAL_IN) != 0);
97 }
98
99 static int intelfb_setup_i2c_bus(struct intelfb_info *dinfo,
100                                                                  struct intelfb_i2c_chan *chan,
101                                                                  const u32 reg, const char *name)
102 {
103         int rc;
104
105         chan->dinfo                                     = dinfo;
106         chan->reg                                       = reg;
107         snprintf(chan->adapter.name, I2C_NAME_SIZE, "intelfb %s", name);
108         chan->adapter.owner                     = THIS_MODULE;
109         chan->adapter.id                        = I2C_HW_B_INTELFB;
110         chan->adapter.algo_data         = &chan->algo;
111         chan->adapter.dev.parent        = &chan->dinfo->pdev->dev;
112         chan->algo.setsda                       = intelfb_gpio_setsda;
113         chan->algo.setscl                       = intelfb_gpio_setscl;
114         chan->algo.getsda                       = intelfb_gpio_getsda;
115         chan->algo.getscl                       = intelfb_gpio_getscl;
116         chan->algo.udelay                       = 40;
117         chan->algo.timeout                      = 20;
118         chan->algo.data                         = chan;
119
120         i2c_set_adapdata(&chan->adapter, chan);
121
122         /* Raise SCL and SDA */
123         intelfb_gpio_setsda(chan, 1);
124         intelfb_gpio_setscl(chan, 1);
125         udelay(20);
126
127         rc = i2c_bit_add_bus(&chan->adapter);
128         if (rc == 0)
129                 DBG_MSG("I2C bus %s registered.\n", name);
130         else
131                 WRN_MSG("Failed to register I2C bus %s.\n", name);
132         return rc;
133 }
134
135 void intelfb_create_i2c_busses(struct intelfb_info *dinfo)
136 {
137         int i = 0;
138
139         /* everyone has at least a single analog output */
140         dinfo->num_outputs = 1;
141         dinfo->output[i].type = INTELFB_OUTPUT_ANALOG;
142
143         /* setup the DDC bus for analog output */
144         intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOA, "CRTDDC_A");
145         i++;
146
147     /* need to add the output busses for each device
148        - this function is very incomplete
149        - i915GM has LVDS and TVOUT for example
150     */
151     switch(dinfo->chipset) {
152         case INTEL_830M:
153         case INTEL_845G:
154         case INTEL_855GM:
155         case INTEL_865G:
156                 dinfo->output[i].type = INTELFB_OUTPUT_DVO;
157                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOD, "DVODDC_D");
158                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus, GPIOE, "DVOI2C_E");
159                 i++;
160                 break;
161         case INTEL_915G:
162         case INTEL_915GM:
163                 /* has  some LVDS + tv-out */
164         case INTEL_945G:
165         case INTEL_945GM:
166                 /* SDVO ports have a single control bus - 2 devices */
167                 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
168                 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus, GPIOE, "SDVOCTRL_E");
169                 /* TODO: initialize the SDVO */
170 //              I830SDVOInit(pScrn, i, DVOB);
171                 i++;
172
173                 /* set up SDVOC */
174                 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
175                 dinfo->output[i].i2c_bus = dinfo->output[i - 1].i2c_bus;
176                 /* TODO: initialize the SDVO */
177 //              I830SDVOInit(pScrn, i, DVOC);
178                 i++;
179                 break;
180         }
181         dinfo->num_outputs = i;
182 }
183
184 void intelfb_delete_i2c_busses(struct intelfb_info *dinfo)
185 {
186         int i;
187
188         for (i = 0; i < MAX_OUTPUTS; i++) {
189                 if (dinfo->output[i].i2c_bus.dinfo) {
190                         i2c_del_adapter(&dinfo->output[i].i2c_bus.adapter);
191                         dinfo->output[i].i2c_bus.dinfo = NULL;
192                 }
193                 if (dinfo->output[i].ddc_bus.dinfo) {
194                         i2c_del_adapter(&dinfo->output[i].ddc_bus.adapter);
195                         dinfo->output[i].ddc_bus.dinfo = NULL;
196                 }
197         }
198 }