input: synaptics_i2c_rmi4: Add low power mode
Enable regulators to go into low power mode when
device enters suspend, to save power. In resume,
return regulators to full power.
Change-Id: I6f5a6d398732b2e23aeba81b3569ae2c081f31e5
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>
diff --git a/drivers/input/touchscreen/synaptics_i2c_rmi4.c b/drivers/input/touchscreen/synaptics_i2c_rmi4.c
index 417ef83..f958efe 100644
--- a/drivers/input/touchscreen/synaptics_i2c_rmi4.c
+++ b/drivers/input/touchscreen/synaptics_i2c_rmi4.c
@@ -91,6 +91,10 @@
static int synaptics_rmi4_reset_device(struct synaptics_rmi4_data *rmi4_data);
+#ifdef CONFIG_PM
+static int synaptics_rmi4_suspend(struct device *dev);
+
+static int synaptics_rmi4_resume(struct device *dev);
#ifdef CONFIG_HAS_EARLYSUSPEND
static ssize_t synaptics_rmi4_full_pm_cycle_show(struct device *dev,
struct device_attribute *attr, char *buf);
@@ -101,10 +105,7 @@
static void synaptics_rmi4_early_suspend(struct early_suspend *h);
static void synaptics_rmi4_late_resume(struct early_suspend *h);
-
-static int synaptics_rmi4_suspend(struct device *dev);
-
-static int synaptics_rmi4_resume(struct device *dev);
+#endif
#endif
static ssize_t synaptics_rmi4_f01_reset_store(struct device *dev,
@@ -1816,7 +1817,7 @@
RMI4_VTG_MIN_UV, RMI4_VTG_MAX_UV);
if (retval) {
dev_err(&rmi4_data->i2c_client->dev,
- "regulator set_vtg failed retval=%d\n",
+ "regulator set_vtg failed retval =%d\n",
retval);
goto err_set_vtg_vdd;
}
@@ -1839,7 +1840,7 @@
RMI4_I2C_VTG_MIN_UV, RMI4_I2C_VTG_MAX_UV);
if (retval) {
dev_err(&rmi4_data->i2c_client->dev,
- "reg set i2c vtg failed retval=%d\n",
+ "reg set i2c vtg failed retval =%d\n",
retval);
goto err_set_vtg_i2c;
}
@@ -2470,6 +2471,75 @@
}
#endif
+static int synaptics_rmi4_regulator_lpm(struct synaptics_rmi4_data *rmi4_data,
+ bool on)
+{
+ int retval;
+
+ if (on == false)
+ goto regulator_hpm;
+
+ retval = reg_set_optimum_mode_check(rmi4_data->vdd, RMI4_LPM_LOAD_UA);
+ if (retval < 0) {
+ dev_err(&rmi4_data->i2c_client->dev,
+ "Regulator vcc_ana set_opt failed rc=%d\n",
+ retval);
+ goto fail_regulator_lpm;
+ }
+
+ if (rmi4_data->board->i2c_pull_up) {
+ retval = reg_set_optimum_mode_check(rmi4_data->vcc_i2c,
+ RMI4_I2C_LOAD_UA);
+ if (retval < 0) {
+ dev_err(&rmi4_data->i2c_client->dev,
+ "Regulator vcc_i2c set_opt failed rc=%d\n",
+ retval);
+ goto fail_regulator_lpm;
+ }
+ }
+
+ return 0;
+
+regulator_hpm:
+
+ retval = reg_set_optimum_mode_check(rmi4_data->vdd,
+ RMI4_ACTIVE_LOAD_UA);
+ if (retval < 0) {
+ dev_err(&rmi4_data->i2c_client->dev,
+ "Regulator vcc_ana set_opt failed rc=%d\n",
+ retval);
+ goto fail_regulator_hpm;
+ }
+
+ if (rmi4_data->board->i2c_pull_up) {
+ retval = reg_set_optimum_mode_check(rmi4_data->vcc_i2c,
+ RMI4_I2C_LOAD_UA);
+ if (retval < 0) {
+ dev_err(&rmi4_data->i2c_client->dev,
+ "Regulator vcc_i2c set_opt failed rc=%d\n",
+ retval);
+ goto fail_regulator_hpm;
+ }
+ }
+
+ return 0;
+
+fail_regulator_lpm:
+ reg_set_optimum_mode_check(rmi4_data->vdd, RMI4_ACTIVE_LOAD_UA);
+ if (rmi4_data->board->i2c_pull_up)
+ reg_set_optimum_mode_check(rmi4_data->vcc_i2c,
+ RMI4_I2C_LOAD_UA);
+
+ return retval;
+
+fail_regulator_hpm:
+ reg_set_optimum_mode_check(rmi4_data->vdd, RMI4_LPM_LOAD_UA);
+ if (rmi4_data->board->i2c_pull_up)
+ reg_set_optimum_mode_check(rmi4_data->vcc_i2c,
+ RMI4_I2C_LPM_LOAD_UA);
+ return retval;
+}
+
/**
* synaptics_rmi4_suspend()
*
@@ -2483,6 +2553,7 @@
static int synaptics_rmi4_suspend(struct device *dev)
{
struct synaptics_rmi4_data *rmi4_data = dev_get_drvdata(dev);
+ int retval;
if (!rmi4_data->sensor_sleep) {
rmi4_data->touch_stopped = true;
@@ -2491,6 +2562,12 @@
synaptics_rmi4_sensor_sleep(rmi4_data);
}
+ retval = synaptics_rmi4_regulator_lpm(rmi4_data, true);
+ if (retval < 0) {
+ dev_err(dev, "failed to enter low power mode\n");
+ return retval;
+ }
+
return 0;
}
@@ -2507,6 +2584,13 @@
static int synaptics_rmi4_resume(struct device *dev)
{
struct synaptics_rmi4_data *rmi4_data = dev_get_drvdata(dev);
+ int retval;
+
+ retval = synaptics_rmi4_regulator_lpm(rmi4_data, false);
+ if (retval < 0) {
+ dev_err(dev, "failed to enter active power mode\n");
+ return retval;
+ }
synaptics_rmi4_sensor_wake(rmi4_data);
rmi4_data->touch_stopped = false;