diff options
Diffstat (limited to 'linux-core/intel_i2c.c')
| -rw-r--r-- | linux-core/intel_i2c.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/linux-core/intel_i2c.c b/linux-core/intel_i2c.c deleted file mode 100644 index efcbf656..00000000 --- a/linux-core/intel_i2c.c +++ /dev/null @@ -1,190 +0,0 @@ -/* - * Copyright © 2006-2007 Intel Corporation - * - * 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 - * the rights to use, copy, modify, merge, publish, distribute, sublicense, - * 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 NONINFRINGEMENT. IN NO EVENT SHALL - * THE AUTHORS OR COPYRIGHT HOLDERS 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. - * - * Authors: - * Eric Anholt <eric@anholt.net> - */ -/* - * Copyright (c) 2006 Dave Airlie <airlied@linux.ie> - * Jesse Barnes <jesse.barnes@intel.com> - */ - -#include <linux/i2c.h> -#include <linux/i2c-id.h> -#include <linux/i2c-algo-bit.h> -#include "drmP.h" -#include "drm.h" -#include "intel_drv.h" -#include "i915_drm.h" -#include "i915_drv.h" - -/* - * Intel GPIO access functions - */ - -#define I2C_RISEFALL_TIME 20 - -static int get_clock(void *data) -{ - struct intel_i2c_chan *chan = data; - struct drm_i915_private *dev_priv = chan->drm_dev->dev_private; - u32 val; - - val = I915_READ(chan->reg); - return ((val & GPIO_CLOCK_VAL_IN) != 0); -} - -static int get_data(void *data) -{ - struct intel_i2c_chan *chan = data; - struct drm_i915_private *dev_priv = chan->drm_dev->dev_private; - u32 val; - - val = I915_READ(chan->reg); - return ((val & GPIO_DATA_VAL_IN) != 0); -} - -static void set_clock(void *data, int state_high) -{ - struct intel_i2c_chan *chan = data; - struct drm_device *dev = chan->drm_dev; - struct drm_i915_private *dev_priv = chan->drm_dev->dev_private; - u32 reserved = 0, clock_bits; - - /* On most chips, these bits must be preserved in software. */ - if (!IS_I830(dev) && !IS_845G(dev)) - reserved = I915_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; - I915_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 intel_i2c_chan *chan = data; - struct drm_device *dev = chan->drm_dev; - struct drm_i915_private *dev_priv = chan->drm_dev->dev_private; - u32 reserved = 0, data_bits; - - /* On most chips, these bits must be preserved in software. */ - if (!IS_I830(dev) && !IS_845G(dev)) - reserved = I915_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; - - I915_WRITE(chan->reg, reserved | data_bits); - udelay(I2C_RISEFALL_TIME); /* wait for the line to change state */ -} - -/** - * 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 intel_i2c_chan *intel_i2c_create(struct drm_device *dev, const u32 reg, - const char *name) -{ - struct intel_i2c_chan *chan; - - chan = kzalloc(sizeof(struct 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; -#ifndef I2C_HW_B_INTELFB -#define I2C_HW_B_INTELFB I2C_HW_B_I810 -#endif - chan->adapter.id = I2C_HW_B_INTELFB; - 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; -} - -/** - * 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 intel_i2c_destroy(struct intel_i2c_chan *chan) -{ - if (!chan) - return; - - i2c_del_adapter(&chan->adapter); - kfree(chan); -} - - - |