thermal: pwm_fan: toggle gpio in suspend/resume

On suspend, this change sets the gpio high.

On suspend:
	free pwm
	request gpio
	set gpio high
On resume:
	free gpio
	request pwm
	set pwm

Bug 1388303

Change-Id: I6905e4217dd170801d84ec98713067e5c2a53abf
Signed-off-by: Anshul Jain <anshulj@nvidia.com>
Reviewed-on: http://git-master/r/302591
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Manish Tuteja <mtuteja@nvidia.com>

2 files changed, 32 insertions, 5 deletions

diff --git a/drivers/thermal/pwm_fan.c b/drivers/thermal/pwm_fan.c
index 40d65a28f61c..56cc54bd977d 100644
--- a/drivers/thermal/pwm_fan.c
+++ b/drivers/thermal/pwm_fan.c
@@ -61,6 +61,8 @@ struct fan_dev_data {
 	int tach_irq;
 	int tach_enabled;
 	int fan_state_cap;
+	int pwm_gpio;
+	int pwm_id;
 };
 
 #ifdef CONFIG_DEBUG_FS
@@ -659,6 +661,8 @@ static int __devinit pwm_fan_probe(struct platform_device *pdev)
 	fan_data->pwm_period = data->pwm_period;
 	fan_data->dev = &pdev->dev;
 	fan_data->fan_state_cap = data->state_cap;
+	fan_data->pwm_gpio = data->pwm_gpio;
+	fan_data->pwm_id = data->pwm_id;
 
 	for (i = 0; i < fan_data->active_steps; i++) {
 		fan_data->fan_rpm[i] = data->active_rpm[i];
@@ -778,6 +782,7 @@ static int __devexit pwm_fan_remove(struct platform_device *pdev)
 static int pwm_fan_suspend(struct platform_device *pdev, pm_message_t state)
 {
 	struct fan_dev_data *fan_data = platform_get_drvdata(pdev);
+	int err;
 
 	mutex_lock(&fan_data->fan_state_lock);
 	dev_info(&pdev->dev, "%s, cur_pwm:%d, target_pwm:%d, cap:%d",
@@ -788,7 +793,18 @@ static int pwm_fan_suspend(struct platform_device *pdev, pm_message_t state)
 	/*Turn the fan off*/
 	fan_data->fan_cur_pwm = 0;
 	fan_data->next_target_pwm = 0;
+
 	set_pwm_duty_cycle(0, fan_data);
+	pwm_disable(fan_data->pwm_dev);
+	pwm_free(fan_data->pwm_dev);
+
+	err = gpio_request(fan_data->pwm_gpio, "pwm-fan");
+	if (err < 0) {
+		dev_err(&pdev->dev, "%s:gpio request failed %d\n",
+			__func__, fan_data->pwm_gpio);
+	}
+
+	gpio_direction_output(fan_data->pwm_gpio, 1);
 
 	/*Stop thermal control*/
 	fan_data->fan_temp_control_flag = 0;
@@ -802,14 +818,24 @@ static int pwm_fan_resume(struct platform_device *pdev)
 
 	/*Sanity check, want to make sure fan is off when the driver resumes*/
 	mutex_lock(&fan_data->fan_state_lock);
-	set_pwm_duty_cycle(0, fan_data);
-
-	/*Start thermal control*/
-	fan_data->fan_temp_control_flag = 1;
 
 	dev_info(&pdev->dev, "%s, cur_pwm:%d, target_pwm:%d, cap:%d",
 	__func__, fan_data->fan_cur_pwm, fan_data->next_target_pwm,
 	fan_data->fan_cap_pwm);
+	gpio_free(fan_data->pwm_gpio);
+	fan_data->pwm_dev = pwm_request(fan_data->pwm_id, dev_name(&pdev->dev));
+	if (IS_ERR_OR_NULL(fan_data->pwm_dev)) {
+		dev_err(&pdev->dev, " %s: unable to request PWM for fan\n",
+		__func__);
+		mutex_unlock(&fan_data->fan_state_lock);
+		return -ENODEV;
+	} else {
+		dev_info(&pdev->dev, " %s, got pwm for fan\n", __func__);
+	}
+
+	set_pwm_duty_cycle(0, fan_data);
+	/*Start thermal control*/
+	fan_data->fan_temp_control_flag = 1;
 
 	mutex_unlock(&fan_data->fan_state_lock);
 	return 0;
diff --git a/include/linux/platform_data/pwm_fan.h b/include/linux/platform_data/pwm_fan.h
index 8751d6270dde..57d21c08cc63 100644
--- a/include/linux/platform_data/pwm_fan.h
+++ b/include/linux/platform_data/pwm_fan.h
@@ -1,7 +1,7 @@
 /*
  * include/linux/platform_data/pwm_fan.h
  *
- * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -34,5 +34,6 @@ struct pwm_fan_platform_data {
 	int precision_multiplier;
 	int tach_gpio;
 	int state_cap;
+	int pwm_gpio;
 };
 #endif