[PATCH 1/2] pwm: Add stubs for pwm operations

From: Mohan Pallaka
Date: Wed May 18 2011 - 01:20:00 EST


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

Signed-off-by: Mohan Pallaka <mpallaka@xxxxxxxxxxxxxx>
---
include/linux/pwm.h | 24 ++++++++++++++++++++++++
1 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 7c77575..f0bc51f 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -3,6 +3,7 @@

struct pwm_device;

+#if defined(CONFIG_PWM)
/*
* pwm_request - request a PWM device
*/
@@ -28,4 +29,27 @@ int pwm_enable(struct pwm_device *pwm);
*/
void pwm_disable(struct pwm_device *pwm);

+#else
+
+struct pwm_device *pwm_request(int pwm_id, const char *label)
+{
+ return NULL;
+}
+
+void pwm_free(struct pwm_device *pwm) { }
+
+int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+{
+ return -EINVAL;
+}
+
+int pwm_enable(struct pwm_device *pwm)
+{
+ return -EINVAL;
+}
+
+void pwm_disable(struct pwm_device *pwm) { }
+
+
+#endif /* CONFIG_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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/