pcmcia: CompactFlash driver for PA Semi Electra boards
[pv_ops_mirror.git] / drivers / video / intelfb / intelfb_i2c.c
blob94c08bb5acf18d146eb62a19b5609d05dc72b906
1 /**************************************************************************
3 Copyright 2006 Dave Airlie <airlied@linux.ie>
5 All Rights Reserved.
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:
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.
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.
26 **************************************************************************/
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>
34 #include <linux/i2c.h>
35 #include <linux/i2c-id.h>
36 #include <linux/i2c-algo-bit.h>
38 #include <asm/io.h>
40 #include "intelfb.h"
41 #include "intelfbhw.h"
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
55 static void intelfb_gpio_setscl(void *data, int state)
57 struct intelfb_i2c_chan *chan = data;
58 struct intelfb_info *dinfo = chan->dinfo;
59 u32 val;
61 OUTREG(chan->reg, (state ? SCL_VAL_OUT : 0) |
62 SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK);
63 val = INREG(chan->reg);
66 static void intelfb_gpio_setsda(void *data, int state)
68 struct intelfb_i2c_chan *chan = data;
69 struct intelfb_info *dinfo = chan->dinfo;
70 u32 val;
72 OUTREG(chan->reg, (state ? SDA_VAL_OUT : 0) |
73 SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK);
74 val = INREG(chan->reg);
77 static int intelfb_gpio_getscl(void *data)
79 struct intelfb_i2c_chan *chan = data;
80 struct intelfb_info *dinfo = chan->dinfo;
81 u32 val;
83 OUTREG(chan->reg, SCL_DIR_MASK);
84 OUTREG(chan->reg, 0);
85 val = INREG(chan->reg);
86 return ((val & SCL_VAL_IN) != 0);
89 static int intelfb_gpio_getsda(void *data)
91 struct intelfb_i2c_chan *chan = data;
92 struct intelfb_info *dinfo = chan->dinfo;
93 u32 val;
95 OUTREG(chan->reg, SDA_DIR_MASK);
96 OUTREG(chan->reg, 0);
97 val = INREG(chan->reg);
98 return ((val & SDA_VAL_IN) != 0);
101 static int intelfb_setup_i2c_bus(struct intelfb_info *dinfo,
102 struct intelfb_i2c_chan *chan,
103 const u32 reg, const char *name)
105 int rc;
107 chan->dinfo = dinfo;
108 chan->reg = reg;
109 snprintf(chan->adapter.name, sizeof(chan->adapter.name),
110 "intelfb %s", name);
111 chan->adapter.owner = THIS_MODULE;
112 chan->adapter.id = I2C_HW_B_INTELFB;
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;
123 i2c_set_adapdata(&chan->adapter, chan);
125 /* Raise SCL and SDA */
126 intelfb_gpio_setsda(chan, 1);
127 intelfb_gpio_setscl(chan, 1);
128 udelay(20);
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;
138 void intelfb_create_i2c_busses(struct intelfb_info *dinfo)
140 int i = 0;
142 /* everyone has at least a single analog output */
143 dinfo->num_outputs = 1;
144 dinfo->output[i].type = INTELFB_OUTPUT_ANALOG;
146 /* setup the DDC bus for analog output */
147 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOA,
148 "CRTDDC_A");
149 i++;
151 /* need to add the output busses for each device
152 - this function is very incomplete
153 - i915GM has LVDS and TVOUT for example
155 switch(dinfo->chipset) {
156 case INTEL_830M:
157 case INTEL_845G:
158 case INTEL_855GM:
159 case INTEL_865G:
160 dinfo->output[i].type = INTELFB_OUTPUT_DVO;
161 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus,
162 GPIOD, "DVODDC_D");
163 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
164 GPIOE, "DVOI2C_E");
165 i++;
166 break;
167 case INTEL_915G:
168 case INTEL_915GM:
169 /* has some LVDS + tv-out */
170 case INTEL_945G:
171 case INTEL_945GM:
172 /* SDVO ports have a single control bus - 2 devices */
173 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
174 intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus,
175 GPIOE, "SDVOCTRL_E");
176 /* TODO: initialize the SDVO */
177 /* I830SDVOInit(pScrn, i, DVOB); */
178 i++;
180 /* set up SDVOC */
181 dinfo->output[i].type = INTELFB_OUTPUT_SDVO;
182 dinfo->output[i].i2c_bus = dinfo->output[i - 1].i2c_bus;
183 /* TODO: initialize the SDVO */
184 /* I830SDVOInit(pScrn, i, DVOC); */
185 i++;
186 break;
188 dinfo->num_outputs = i;
191 void intelfb_delete_i2c_busses(struct intelfb_info *dinfo)
193 int i;
195 for (i = 0; i < MAX_OUTPUTS; i++) {
196 if (dinfo->output[i].i2c_bus.dinfo) {
197 i2c_del_adapter(&dinfo->output[i].i2c_bus.adapter);
198 dinfo->output[i].i2c_bus.dinfo = NULL;
200 if (dinfo->output[i].ddc_bus.dinfo) {
201 i2c_del_adapter(&dinfo->output[i].ddc_bus.adapter);
202 dinfo->output[i].ddc_bus.dinfo = NULL;