diff options
Diffstat (limited to 'drivers/video/intelfb/intelfb_i2c.c')
| -rw-r--r-- | drivers/video/intelfb/intelfb_i2c.c | 184 |
1 files changed, 184 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..d73572355c57 --- /dev/null +++ b/drivers/video/intelfb/intelfb_i2c.c @@ -0,0 +1,184 @@ +/************************************************************************** + + 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/config.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/sched.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 rc; + + chan->dinfo = dinfo; + chan->reg = reg; + snprintf(chan->adapter.name, I2C_NAME_SIZE, "intelfb %s", name); + chan->adapter.owner = THIS_MODULE; + chan->adapter.id = I2C_HW_B_INTELFB; + 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"); + 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"); + intelfb_setup_i2c_bus(dinfo, &dinfo->output[i].i2c_bus, GPIOE, "DVOI2C_E"); + i++; + break; + case INTEL_915G: + case INTEL_915GM: + /* has some LVDS + tv-out */ + case INTEL_945G: + case INTEL_945GM: + /* 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"); + /* 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; +} |