diff options
Diffstat (limited to 'drivers/staging/gma500/intel_i2c.c')
-rw-r--r-- | drivers/staging/gma500/intel_i2c.c | 170 |
1 files changed, 0 insertions, 170 deletions
diff --git a/drivers/staging/gma500/intel_i2c.c b/drivers/staging/gma500/intel_i2c.c deleted file mode 100644 index 51cbf65268e..00000000000 --- a/drivers/staging/gma500/intel_i2c.c +++ /dev/null @@ -1,170 +0,0 @@ -/* - * Copyright © 2006-2007 Intel Corporation - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. - * - * Authors: - * Eric Anholt <eric@anholt.net> - */ - -#include <linux/i2c.h> -#include <linux/i2c-algo-bit.h> -#include <linux/export.h> - -#include "psb_drv.h" -#include "psb_intel_reg.h" - -/* - * Intel GPIO access functions - */ - -#define I2C_RISEFALL_TIME 20 - -static int get_clock(void *data) -{ - struct psb_intel_i2c_chan *chan = data; - struct drm_device *dev = chan->drm_dev; - u32 val; - - val = REG_READ(chan->reg); - return (val & GPIO_CLOCK_VAL_IN) != 0; -} - -static int get_data(void *data) -{ - struct psb_intel_i2c_chan *chan = data; - struct drm_device *dev = chan->drm_dev; - u32 val; - - val = REG_READ(chan->reg); - return (val & GPIO_DATA_VAL_IN) != 0; -} - -static void set_clock(void *data, int state_high) -{ - struct psb_intel_i2c_chan *chan = data; - struct drm_device *dev = chan->drm_dev; - u32 reserved = 0, clock_bits; - - /* On most chips, these bits must be preserved in software. */ - reserved = - REG_READ(chan->reg) & (GPIO_DATA_PULLUP_DISABLE | - GPIO_CLOCK_PULLUP_DISABLE); - - if (state_high) - clock_bits = GPIO_CLOCK_DIR_IN | GPIO_CLOCK_DIR_MASK; - else - clock_bits = GPIO_CLOCK_DIR_OUT | GPIO_CLOCK_DIR_MASK | - GPIO_CLOCK_VAL_MASK; - REG_WRITE(chan->reg, reserved | clock_bits); - udelay(I2C_RISEFALL_TIME); /* wait for the line to change state */ -} - -static void set_data(void *data, int state_high) -{ - struct psb_intel_i2c_chan *chan = data; - struct drm_device *dev = chan->drm_dev; - u32 reserved = 0, data_bits; - - /* On most chips, these bits must be preserved in software. */ - reserved = - REG_READ(chan->reg) & (GPIO_DATA_PULLUP_DISABLE | - GPIO_CLOCK_PULLUP_DISABLE); - - if (state_high) - data_bits = GPIO_DATA_DIR_IN | GPIO_DATA_DIR_MASK; - else - data_bits = - GPIO_DATA_DIR_OUT | GPIO_DATA_DIR_MASK | - GPIO_DATA_VAL_MASK; - - REG_WRITE(chan->reg, reserved | data_bits); - udelay(I2C_RISEFALL_TIME); /* wait for the line to change state */ -} - -/** - * psb_intel_i2c_create - instantiate an Intel i2c bus using the specified GPIO reg - * @dev: DRM device - * @output: driver specific output device - * @reg: GPIO reg to use - * @name: name for this bus - * - * Creates and registers a new i2c bus with the Linux i2c layer, for use - * in output probing and control (e.g. DDC or SDVO control functions). - * - * Possible values for @reg include: - * %GPIOA - * %GPIOB - * %GPIOC - * %GPIOD - * %GPIOE - * %GPIOF - * %GPIOG - * %GPIOH - * see PRM for details on how these different busses are used. - */ -struct psb_intel_i2c_chan *psb_intel_i2c_create(struct drm_device *dev, - const u32 reg, const char *name) -{ - struct psb_intel_i2c_chan *chan; - - chan = kzalloc(sizeof(struct psb_intel_i2c_chan), GFP_KERNEL); - if (!chan) - goto out_free; - - chan->drm_dev = dev; - chan->reg = reg; - snprintf(chan->adapter.name, I2C_NAME_SIZE, "intel drm %s", name); - chan->adapter.owner = THIS_MODULE; - chan->adapter.algo_data = &chan->algo; - chan->adapter.dev.parent = &dev->pdev->dev; - chan->algo.setsda = set_data; - chan->algo.setscl = set_clock; - chan->algo.getsda = get_data; - chan->algo.getscl = get_clock; - chan->algo.udelay = 20; - chan->algo.timeout = usecs_to_jiffies(2200); - chan->algo.data = chan; - - i2c_set_adapdata(&chan->adapter, chan); - - if (i2c_bit_add_bus(&chan->adapter)) - goto out_free; - - /* JJJ: raise SCL and SDA? */ - set_data(chan, 1); - set_clock(chan, 1); - udelay(20); - - return chan; - -out_free: - kfree(chan); - return NULL; -} - -/** - * psb_intel_i2c_destroy - unregister and free i2c bus resources - * @output: channel to free - * - * Unregister the adapter from the i2c layer, then free the structure. - */ -void psb_intel_i2c_destroy(struct psb_intel_i2c_chan *chan) -{ - if (!chan) - return; - - i2c_del_adapter(&chan->adapter); - kfree(chan); -} |