commit bace50b68cb37220406094be7ced3b268e3e9556
author Jing Lin <jinglin@codeaurora.org> Tue Oct 18 22:55:47 2011 -0700
committer Jing Lin <jinglin@codeaurora.org> Fri Oct 21 11:46:20 2011 -0700
tree 22aa615382b8c668c9c8fbb4899be58926a3855e
parent 36aee816a03848083fc1c3846799a933e578682b

input: atmel_mxt_ts: Move regulators to LPM/HPM in suspend/resume

Change-Id: I75900b242a628a3ab024e8489273c4cad185c52b
Signed-off-by: Jing Lin <jinglin@codeaurora.org>

drivers/input/touchscreen/atmel_mxt_ts.c

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 158013a..4d97331 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -181,10 +181,12 @@
 #define MXT_VTG_MIN_UV		2700000
 #define MXT_VTG_MAX_UV		3300000
 #define MXT_ACTIVE_LOAD_UA	15000
+#define MXT_LPM_LOAD_UA		10
 
 #define MXT_I2C_VTG_MIN_UV	1800000
 #define MXT_I2C_VTG_MAX_UV	1800000
 #define MXT_I2C_LOAD_UA		10000
+#define MXT_I2C_LPM_LOAD_UA	10
 
 /* Define for MXT_GEN_COMMAND */
 #define MXT_BOOT_VALUE		0xa5
@@ -1270,6 +1272,68 @@
 }
 
 #ifdef CONFIG_PM
+static int mxt_regulator_lpm(struct mxt_data *data, bool on)
+{
+
+	int rc;
+
+	if (on == false)
+		goto regulator_hpm;
+
+	rc = regulator_set_optimum_mode(data->vcc, MXT_LPM_LOAD_UA);
+	if (rc < 0) {
+		dev_err(&data->client->dev,
+			"Regulator set_opt failed rc=%d\n", rc);
+		goto fail_regulator_lpm;
+	}
+
+	if (data->pdata->i2c_pull_up) {
+		rc = regulator_set_optimum_mode(data->vcc_i2c,
+						MXT_I2C_LPM_LOAD_UA);
+		if (rc < 0) {
+			dev_err(&data->client->dev,
+				"Regulator set_opt failed rc=%d\n", rc);
+			goto fail_regulator_lpm;
+		}
+	}
+
+	return 0;
+
+regulator_hpm:
+
+	rc = regulator_set_optimum_mode(data->vcc, MXT_ACTIVE_LOAD_UA);
+	if (rc < 0) {
+		dev_err(&data->client->dev,
+			"Regulator set_opt failed rc=%d\n", rc);
+		goto fail_regulator_hpm;
+	}
+
+	if (data->pdata->i2c_pull_up) {
+		rc = regulator_set_optimum_mode(data->vcc_i2c, MXT_I2C_LOAD_UA);
+		if (rc < 0) {
+			dev_err(&data->client->dev,
+				"Regulator set_opt failed rc=%d\n", rc);
+			goto fail_regulator_hpm;
+		}
+	}
+
+	return 0;
+
+fail_regulator_lpm:
+	regulator_set_optimum_mode(data->vcc, MXT_ACTIVE_LOAD_UA);
+	if (data->pdata->i2c_pull_up)
+		regulator_set_optimum_mode(data->vcc_i2c, MXT_I2C_LOAD_UA);
+
+	return rc;
+
+fail_regulator_hpm:
+	regulator_set_optimum_mode(data->vcc, MXT_LPM_LOAD_UA);
+	if (data->pdata->i2c_pull_up)
+		regulator_set_optimum_mode(data->vcc_i2c, MXT_I2C_LPM_LOAD_UA);
+
+	return rc;
+}
+
 static int mxt_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
@@ -1291,6 +1355,13 @@
 
 	mutex_unlock(&input_dev->mutex);
 
+	/* put regulators in low power mode */
+	error = mxt_regulator_lpm(data, true);
+	if (error < 0) {
+		dev_err(dev, "failed to enter low power mode\n");
+		return error;
+	}
+
 	return 0;
 }
 
@@ -1301,6 +1372,13 @@
 	struct input_dev *input_dev = data->input_dev;
 	int error;
 
+	/* put regulators in high power mode */
+	error = mxt_regulator_lpm(data, false);
+	if (error < 0) {
+		dev_err(dev, "failed to enter high power mode\n");
+		return error;
+	}
+
 	mutex_lock(&input_dev->mutex);
 
 	if (input_dev->users) {