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Date: Mon, 26 Mar 2012 22:26:42 +0800
From: Daniel Kurtz <djkurtz@...omium.org>
To: Keith Packard <keithp@...thp.com>, David Airlie <airlied@...ux.ie>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Daniel Vetter <daniel@...ll.ch>,
Chris Wilson <chris@...is-wilson.co.uk>
Cc: Benson Leung <bleung@...omium.org>,
Yufeng Shen <miletus@...omium.org>,
Daniel Kurtz <djkurtz@...omium.org>
Subject: [PATCH 03/11 v3] drm/i915/intel_i2c: use i2c pre/post_xfer functions to setup gpio xfers
Instead of rolling our own custom quirk_xfer function, use the bit_algo
pre_xfer and post_xfer functions to setup and teardown bit-banged
i2c transactions.
gmbus_xfer uses .force_bit to determine which i2c_algorithm to use,
either i2c_bit_algo.master_xfer or its own. So, Similarly, let gmbus_func
use .force_bit to determine which i2c functionalities are available,
either i2c_bit_algo.functionality, or its own.
Signed-off-by: Daniel Kurtz <djkurtz@...omium.org>
---
drivers/gpu/drm/i915/intel_i2c.c | 72 +++++++++++++++++++++++--------------
1 files changed, 45 insertions(+), 27 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index 54f85a1..ae08a08 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -137,6 +137,35 @@ static void set_data(void *data, int state_high)
POSTING_READ(bus->gpio_reg);
}
+static int
+intel_gpio_pre_xfer(struct i2c_adapter *adapter)
+{
+ struct intel_gmbus *bus = container_of(adapter,
+ struct intel_gmbus,
+ adapter);
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+
+ intel_i2c_reset(dev_priv->dev);
+ intel_i2c_quirk_set(dev_priv, true);
+ set_data(bus, 1);
+ set_clock(bus, 1);
+ udelay(I2C_RISEFALL_TIME);
+ return 0;
+}
+
+static void
+intel_gpio_post_xfer(struct i2c_adapter *adapter)
+{
+ struct intel_gmbus *bus = container_of(adapter,
+ struct intel_gmbus,
+ adapter);
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+
+ set_data(bus, 1);
+ set_clock(bus, 1);
+ intel_i2c_quirk_set(dev_priv, false);
+}
+
static bool
intel_gpio_setup(struct intel_gmbus *bus, u32 pin)
{
@@ -166,6 +195,8 @@ intel_gpio_setup(struct intel_gmbus *bus, u32 pin)
algo->setscl = set_clock;
algo->getsda = get_data;
algo->getscl = get_clock;
+ algo->pre_xfer = intel_gpio_pre_xfer;
+ algo->post_xfer = intel_gpio_post_xfer;
algo->udelay = I2C_RISEFALL_TIME;
algo->timeout = usecs_to_jiffies(2200);
algo->data = bus;
@@ -174,30 +205,6 @@ intel_gpio_setup(struct intel_gmbus *bus, u32 pin)
}
static int
-intel_i2c_quirk_xfer(struct intel_gmbus *bus,
- struct i2c_msg *msgs,
- int num)
-{
- struct drm_i915_private *dev_priv = bus->dev_priv;
- int ret;
-
- intel_i2c_reset(dev_priv->dev);
-
- intel_i2c_quirk_set(dev_priv, true);
- set_data(bus, 1);
- set_clock(bus, 1);
- udelay(I2C_RISEFALL_TIME);
-
- ret = i2c_bit_algo.master_xfer(&bus->adapter, msgs, num);
-
- set_data(bus, 1);
- set_clock(bus, 1);
- intel_i2c_quirk_set(dev_priv, false);
-
- return ret;
-}
-
-static int
gmbus_xfer(struct i2c_adapter *adapter,
struct i2c_msg *msgs,
int num)
@@ -211,7 +218,7 @@ gmbus_xfer(struct i2c_adapter *adapter,
mutex_lock(&dev_priv->gmbus_mutex);
if (bus->force_bit) {
- ret = intel_i2c_quirk_xfer(bus, msgs, num);
+ ret = i2c_bit_algo.master_xfer(adapter, msgs, num);
goto out;
}
@@ -325,8 +332,9 @@ timeout:
ret = -EIO;
} else {
bus->force_bit = true;
- ret = intel_i2c_quirk_xfer(bus, msgs, num);
+ ret = i2c_bit_algo.master_xfer(adapter, msgs, num);
}
+
out:
mutex_unlock(&dev_priv->gmbus_mutex);
return ret;
@@ -334,11 +342,21 @@ out:
static u32 gmbus_func(struct i2c_adapter *adapter)
{
- return i2c_bit_algo.functionality(adapter) &
+ struct intel_gmbus *bus = container_of(adapter,
+ struct intel_gmbus,
+ adapter);
+ struct drm_i915_private *dev_priv = bus->dev_priv;
+ u32 func;
+
+ mutex_lock(&dev_priv->gmbus_mutex);
+ func = bus->force_bit ? i2c_bit_algo.functionality(adapter) :
(I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL |
/* I2C_FUNC_10BIT_ADDR | */
I2C_FUNC_SMBUS_READ_BLOCK_DATA |
I2C_FUNC_SMBUS_BLOCK_PROC_CALL);
+ mutex_unlock(&dev_priv->gmbus_mutex);
+
+ return func;
}
static const struct i2c_algorithm gmbus_algorithm = {
--
1.7.7.3
--
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