| /************************************************************************** |
| |
| Copyright 2006 Dave Airlie <airlied@linux.ie> |
| |
| All Rights Reserved. |
| |
| Permission is hereby granted, free of charge, to any person obtaining a |
| copy of this software and associated documentation files (the "Software"), |
| to deal in the Software without restriction, including without limitation |
| on the rights to use, copy, modify, merge, publish, distribute, sub |
| license, and/or sell copies of the Software, and to permit persons to whom |
| the Software is furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice (including the next |
| paragraph) shall be included in all copies or substantial portions of the |
| Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
| THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, |
| DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
| OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
| USE OR OTHER DEALINGS IN THE SOFTWARE. |
| |
| **************************************************************************/ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/delay.h> |
| #include <linux/pci.h> |
| #include <linux/fb.h> |
| |
| #include <linux/i2c.h> |
| #include <linux/i2c-id.h> |
| #include <linux/i2c-algo-bit.h> |
| |
| #include <asm/io.h> |
| |
| #include "intelfb.h" |
| #include "intelfbhw.h" |
| |
| /* bit locations in the registers */ |
| #define SCL_DIR_MASK 0x0001 |
| #define SCL_DIR 0x0002 |
| #define SCL_VAL_MASK 0x0004 |
| #define SCL_VAL_OUT 0x0008 |
| #define SCL_VAL_IN 0x0010 |
| #define SDA_DIR_MASK 0x0100 |
| #define SDA_DIR 0x0200 |
| #define SDA_VAL_MASK 0x0400 |
| #define SDA_VAL_OUT 0x0800 |
| #define SDA_VAL_IN 0x1000 |
| |
| static void intelfb_gpio_setscl(void *data, int state) |
| { |
| struct intelfb_i2c_chan *chan = data; |
| struct intelfb_info *dinfo = chan->dinfo; |
| u32 val; |
| |
| OUTREG(chan->reg, (state ? SCL_VAL_OUT : 0) | |
| SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK); |
| val = INREG(chan->reg); |
| } |
| |
| static void intelfb_gpio_setsda(void *data, int state) |
| { |
| struct intelfb_i2c_chan *chan = data; |
| struct intelfb_info *dinfo = chan->dinfo; |
| u32 val; |
| |
| OUTREG(chan->reg, (state ? SDA_VAL_OUT : 0) | |
| SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK); |
| val = INREG(chan->reg); |
| } |
| |
| static int intelfb_gpio_getscl(void *data) |
| { |
| struct intelfb_i2c_chan *chan = data; |
| struct intelfb_info *dinfo = chan->dinfo; |
| u32 val; |
| |
| OUTREG(chan->reg, SCL_DIR_MASK); |
| OUTREG(chan->reg, 0); |
| val = INREG(chan->reg); |
| return ((val & SCL_VAL_IN) != 0); |
| } |
| |
| static int intelfb_gpio_getsda(void *data) |
| { |
| struct intelfb_i2c_chan *chan = data; |
| struct intelfb_info *dinfo = chan->dinfo; |
| u32 val; |
| |
| OUTREG(chan->reg, SDA_DIR_MASK); |
| OUTREG(chan->reg, 0); |
| val = INREG(chan->reg); |
| return ((val & SDA_VAL_IN) != 0); |
| } |
| |
| static int intelfb_setup_i2c_bus(struct intelfb_info *dinfo, |
| struct intelfb_i2c_chan *chan, |
| const u32 reg, const char *name, |
| int class) |
| { |
| int rc; |
| |
| chan->dinfo = dinfo; |
| chan->reg = reg; |
| snprintf(chan->adapter.name, sizeof(chan->adapter.name), |
| "intelfb %s", name); |
| chan->adapter.class = class; |
| chan->adapter.owner = THIS_MODULE; |
| chan->adapter.algo_data = &chan->algo; |
| chan->adapter.dev.parent = &chan->dinfo->pdev->dev; |
| chan->algo.setsda = intelfb_gpio_setsda; |
| chan->algo.setscl = intelfb_gpio_setscl; |
| chan->algo.getsda = intelfb_gpio_getsda; |
| chan->algo.getscl = intelfb_gpio_getscl; |
| chan->algo.udelay = 40; |
| chan->algo.timeout = 20; |
| chan->algo.data = chan; |
| |
| i2c_set_adapdata(&chan->adapter, chan); |
| |
| /* Raise SCL and SDA */ |
| intelfb_gpio_setsda(chan, 1); |
| intelfb_gpio_setscl(chan, 1); |
| udelay(20); |
| |
| rc = i2c_bit_add_bus(&chan->adapter); |
| if (rc == 0) |
| DBG_MSG("I2C bus %s registered.\n", name); |
| else |
| WRN_MSG("Failed to register I2C bus %s.\n", name); |
| return rc; |
| } |
| |
| void intelfb_create_i2c_busses(struct intelfb_info *dinfo) |
| { |
| int i = 0; |
| |
| /* everyone has at least a single analog output */ |
| dinfo->num_outputs = 1; |
| dinfo->output[i].type = INTELFB_OUTPUT_ANALOG; |
| |
| /* setup the DDC bus for analog output */ |
| intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, GPIOA, |
| "CRTDDC_A", I2C_CLASS_DDC); |
| i++; |
| |
| /* need to add the output busses for each device |
| - this function is very incomplete |
| - i915GM has LVDS and TVOUT for example |
| */ |
| switch(dinfo->chipset) { |
| case INTEL_830M: |
| case INTEL_845G: |
| case INTEL_855GM: |
| case INTEL_865G: |
| dinfo->output[i].type = INTELFB_OUTPUT_DVO; |
| intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].ddc_bus, |
| GPIOD, "DVODDC_D", I2C_CLASS_DDC); |
| intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus, |
| GPIOE, "DVOI2C_E", 0); |
| i++; |
| break; |
| case INTEL_915G: |
| case INTEL_915GM: |
| /* has some LVDS + tv-out */ |
| case INTEL_945G: |
| case INTEL_945GM: |
| case INTEL_945GME: |
| case INTEL_965G: |
| case INTEL_965GM: |
| /* SDVO ports have a single control bus - 2 devices */ |
| dinfo->output[i].type = INTELFB_OUTPUT_SDVO; |
| intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus, |
| GPIOE, "SDVOCTRL_E", 0); |
| /* TODO: initialize the SDVO */ |
| /* I830SDVOInit(pScrn, i, DVOB); */ |
| i++; |
| |
| /* set up SDVOC */ |
| dinfo->output[i].type = INTELFB_OUTPUT_SDVO; |
| dinfo->output[i].i2c_bus = dinfo->output[i - 1].i2c_bus; |
| /* TODO: initialize the SDVO */ |
| /* I830SDVOInit(pScrn, i, DVOC); */ |
| i++; |
| break; |
| } |
| dinfo->num_outputs = i; |
| } |
| |
| void intelfb_delete_i2c_busses(struct intelfb_info *dinfo) |
| { |
| int i; |
| |
| for (i = 0; i < MAX_OUTPUTS; i++) { |
| if (dinfo->output[i].i2c_bus.dinfo) { |
| i2c_del_adapter(&dinfo->output[i].i2c_bus.adapter); |
| dinfo->output[i].i2c_bus.dinfo = NULL; |
| } |
| if (dinfo->output[i].ddc_bus.dinfo) { |
| i2c_del_adapter(&dinfo->output[i].ddc_bus.adapter); |
| dinfo->output[i].ddc_bus.dinfo = NULL; |
| } |
| } |
| } |