[PATCH] Input: synaptics-rmi4: Support regulator supplies

Bjorn Andersson
2016-03-30T16:57:29Z

From: Bjorn Andersson <bjorn.andersson@sonymobile.com>

Support the two supplies - vdd and vio - to make it possible to control
power to the Synaptics chip.

Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
.../devicetree/bindings/input/rmi4/rmi_i2c.txt | 7 ++++
drivers/input/rmi4/rmi_i2c.c | 45 ++++++++++++++++++++++
2 files changed, 52 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/rmi4/rmi_i2c.txt b/Documentation/devicetree/bindings/input/rmi4/rmi_i2c.txt
index 95fa715c6046..a8c31f40f816 100644
--- a/Documentation/devicetree/bindings/input/rmi4/rmi_i2c.txt
+++ b/Documentation/devicetree/bindings/input/rmi4/rmi_i2c.txt
@@ -22,6 +22,13 @@ See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
- syna,reset-delay-ms: The number of milliseconds to wait after resetting the
device.

+- vdd-supply: VDD power supply.
+See Documentation/devicetree/bindings/regulator/regulator.txt
+
+- vio-supply: VIO power supply
+See Documentation/devicetree/bindings/regulator/regulator.txt
+
+
Function Parameters:
Parameters specific to RMI functions are contained in child nodes of the rmi device
node. Documentation for the parameters of each function can be found in:
diff --git a/drivers/input/rmi4/rmi_i2c.c b/drivers/input/rmi4/rmi_i2c.c
index a96a326b53bd..a8c794daba04 100644
--- a/drivers/input/rmi4/rmi_i2c.c
+++ b/drivers/input/rmi4/rmi_i2c.c
@@ -11,6 +11,8 @@
#include <linux/rmi.h>
#include <linux/irq.h>
#include <linux/of.h>
+#include <linux/delay.h>
+#include <linux/regulator/consumer.h>
#include "rmi_driver.h"

#define BUFFER_SIZE_INCREMENT 32
@@ -37,6 +39,8 @@ struct rmi_i2c_xport {

u8 *tx_buf;
size_t tx_buf_size;
+
+ struct regulator_bulk_data supplies[2];
};

#define RMI_PAGE_SELECT_REGISTER 0xff
@@ -246,6 +250,22 @@ static int rmi_i2c_probe(struct i2c_client *client,
return -ENODEV;
}

+ rmi_i2c->supplies[0].supply = "vdd";
+ rmi_i2c->supplies[1].supply = "vio";
+ retval = devm_regulator_bulk_get(&client->dev,
+ ARRAY_SIZE(rmi_i2c->supplies),
+ rmi_i2c->supplies);
+ if (retval < 0)
+ return retval;
+
+ retval = regulator_bulk_enable(ARRAY_SIZE(rmi_i2c->supplies),
+ rmi_i2c->supplies);
+ if (retval < 0)
+ return retval;
+
+ /* Allow the firmware to get ready */
+ msleep(10);
+
rmi_i2c->client = client;
mutex_init(&rmi_i2c->page_mutex);

@@ -286,6 +306,8 @@ static int rmi_i2c_remove(struct i2c_client *client)
struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);

rmi_unregister_transport_device(&rmi_i2c->xport);
+ regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
+ rmi_i2c->supplies);

return 0;
}
@@ -308,6 +330,10 @@ static int rmi_i2c_suspend(struct device *dev)
dev_warn(dev, "Failed to enable irq for wake: %d\n",
ret);
}
+
+ regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
+ rmi_i2c->supplies);
+
return ret;
}

@@ -317,6 +343,14 @@ static int rmi_i2c_resume(struct device *dev)
struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
int ret;

+ ret = regulator_bulk_enable(ARRAY_SIZE(rmi_i2c->supplies),
+ rmi_i2c->supplies);
+ if (ret)
+ return ret;
+
+ /* Allow the firmware to get ready */
+ msleep(10);
+
enable_irq(rmi_i2c->irq);
if (device_may_wakeup(&client->dev)) {
ret = disable_irq_wake(rmi_i2c->irq);
@@ -346,6 +380,9 @@ static int rmi_i2c_runtime_suspend(struct device *dev)

disable_irq(rmi_i2c->irq);

+ regulator_bulk_disable(ARRAY_SIZE(rmi_i2c->supplies),
+ rmi_i2c->supplies);
+
return 0;
}

@@ -355,6 +392,14 @@ static int rmi_i2c_runtime_resume(struct device *dev)
struct rmi_i2c_xport *rmi_i2c = i2c_get_clientdata(client);
int ret;

+ ret = regulator_bulk_enable(ARRAY_SIZE(rmi_i2c->supplies),
+ rmi_i2c->supplies);
+ if (ret)
+ return ret;
+
+ /* Allow the firmware to get ready */
+ msleep(10);
+
enable_irq(rmi_i2c->irq);

ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev);
--
2.5.0