Input: synaptics-rmi4 - support regulator supplies

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>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Andrew Duggan <aduggan@synaptics.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/Documentation/devicetree/bindings/input/rmi4/rmi_i2c.txt b/Documentation/devicetree/bindings/input/rmi4/rmi_i2c.txt
index 95fa715..ec908b9 100644 (file)
--- a/Documentation/devicetree/bindings/input/rmi4/rmi_i2c.txt
+++ b/Documentation/devicetree/bindings/input/rmi4/rmi_i2c.txt
@@ -22,6 +22,15 @@ See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
 - syna,reset-delay-ms: The number of milliseconds to wait after resetting the
                        device.
 
+- syna,startup-delay-ms: The number of milliseconds to wait after powering on
+                        the device.
+
+- vdd-supply: VDD power supply.
+See ../regulator/regulator.txt
+
+- vio-supply: VIO power supply
+See ../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 a96a326..6f2e0e4 100644 (file)
--- 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 +39,9 @@ struct rmi_i2c_xport {
 
        u8 *tx_buf;
        size_t tx_buf_size;
+
+       struct regulator_bulk_data supplies[2];
+       u32 startup_delay;
 };
 
 #define RMI_PAGE_SELECT_REGISTER 0xff
@@ -246,6 +251,24 @@ 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;
+
+       of_property_read_u32(client->dev.of_node, "syna,startup-delay-ms",
+                            &rmi_i2c->startup_delay);
+
+       msleep(rmi_i2c->startup_delay);
+
        rmi_i2c->client = client;
        mutex_init(&rmi_i2c->page_mutex);
 
@@ -286,6 +309,8 @@ 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 +333,10 @@ 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 +346,13 @@ 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;
+
+       msleep(rmi_i2c->startup_delay);
+
        enable_irq(rmi_i2c->irq);
        if (device_may_wakeup(&client->dev)) {
                ret = disable_irq_wake(rmi_i2c->irq);
@@ -346,6 +382,9 @@ 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 +394,13 @@ 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;
+
+       msleep(rmi_i2c->startup_delay);
+
        enable_irq(rmi_i2c->irq);
 
        ret = rmi_driver_resume(rmi_i2c->xport.rmi_dev);