linux-kernel - [PATCH 1/2] pwm: Add __weak attributed functions for pwm operations

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Date:	Mon,  7 Mar 2011 16:39:41 +0530
From:	Mohan Pallaka <mpallaka@...eaurora.org>
To:	linux-input@...r.kernel.org, dmitry.torokhov@...il.com
Cc:	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Mohan Pallaka <mpallaka@...eaurora.org>
Subject: [PATCH 1/2] pwm: Add __weak attributed functions for pwm operations

For chip drivers that support both pwm and non-pwm modes
would encounter compilation errors if the platform doesn't
have support for pwm though the chip is programmed to work
in non-pwm mode. Add __weak attributed pwm functions to avoid
compilation issues in these scenarios.

Signed-off-by: Mohan Pallaka <mpallaka@...eaurora.org>
---
 include/linux/pwm.h |   21 ++++++++++++++++-----
 1 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 7c77575..3a8c3df 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -3,29 +3,40 @@
 
 struct pwm_device;
 
+/* Add __weak functions to support PWM */
+
 /*
  * pwm_request - request a PWM device
  */
-struct pwm_device *pwm_request(int pwm_id, const char *label);
+struct pwm_device __weak *pwm_request(int pwm_id, const char *label)
+{
+	return NULL;
+}
 
 /*
  * pwm_free - free a PWM device
  */
-void pwm_free(struct pwm_device *pwm);
+void __weak pwm_free(struct pwm_device *pwm) { }
 
 /*
  * pwm_config - change a PWM device configuration
  */
-int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns);
+int __weak pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+{
+	return -ENODEV;
+}
 
 /*
  * pwm_enable - start a PWM output toggling
  */
-int pwm_enable(struct pwm_device *pwm);
+int __weak pwm_enable(struct pwm_device *pwm)
+{
+	return -EINVAL;
+}
 
 /*
  * pwm_disable - stop a PWM output toggling
  */
-void pwm_disable(struct pwm_device *pwm);
+void __weak pwm_disable(struct pwm_device *pwm) { }
 
 #endif /* __LINUX_PWM_H */

-- 
Sent by a consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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