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

Dmitry Torokhov
2016-03-31T18:19:05Z

Hi Bjorn,

On Wed, Mar 30, 2016 at 09:57:29AM -0700, Bjorn Andersson wrote:
> From: Bjorn Andersson <bjorn.andersson-/MT0OVThwyLZJqsBc5GL+g@public.gmane.org>
>
> 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-/MT0OVThwyLZJqsBc5GL+g@public.gmane.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> ---
> .../devicetree/bindings/input/rmi4/rmi_i2c.txt | 7 ++++
> drivers/input/rmi4/rmi_i2c.c | 45 ++++++++++++++++++++++

Would not we need pretty much the same changes for SPI devices? Can this
be done in core?

Thanks.

> 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
>

--
Dmitry
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