From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Torokhov Subject: Re: [PATCH v2 4/7] touchscreen: pixcir_i2c: Add support for wake and enable gpios Date: Fri, 20 Nov 2015 10:54:51 -0800 Message-ID: <20151120185451.GC26895@dtor-ws> References: <1448025892-20899-1-git-send-email-hdegoede@redhat.com> <1448025892-20899-5-git-send-email-hdegoede@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-pa0-f42.google.com ([209.85.220.42]:33481 "EHLO mail-pa0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760160AbbKTSyz (ORCPT ); Fri, 20 Nov 2015 13:54:55 -0500 Content-Disposition: inline In-Reply-To: <1448025892-20899-5-git-send-email-hdegoede@redhat.com> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: Hans de Goede Cc: Maxime Ripard , Sander Vermin , linux-input@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree , linux-sunxi@googlegroups.com On Fri, Nov 20, 2015 at 02:24:49PM +0100, Hans de Goede wrote: > From: Sander Vermin > > On some devices the wake and enable pins of the pixcir touchscreen > controller are connected to gpios and these must be controlled by the > driver for the device to operate properly. > > Signed-off-by: Sander Vermin > Signed-off-by: Hans de Goede > --- > Changes in v2 (Hans de Goede): > -Split the changes for dealing with inverted / swapped axis out into a > separate patch > -Remove a bunch of dev_info calls to make the driver less chatty > -Use devm_gpiod_get_optional as these new gpios are optional > -Only msleep after setting enable high if we have an enable pin > --- > .../bindings/input/touchscreen/pixcir_i2c_ts.txt | 2 + > drivers/input/touchscreen/pixcir_i2c_ts.c | 46 ++++++++++++++++++++++ > 2 files changed, 48 insertions(+) > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt > index 8eb240a..72ca5ec 100644 > --- a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt > +++ b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt > @@ -10,6 +10,8 @@ Required properties: > > Optional properties: > - reset-gpio: GPIO connected to the RESET line of the chip > +- enable-gpios: GPIO connected to the ENABLE line of the chip > +- wake-gpios: GPIO connected to the WAKE line of the chip > > Example: > > diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c > index 211408c..b75ef65 100644 > --- a/drivers/input/touchscreen/pixcir_i2c_ts.c > +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c > @@ -38,6 +38,8 @@ struct pixcir_i2c_ts_data { > struct input_dev *input; > struct gpio_desc *gpio_attb; > struct gpio_desc *gpio_reset; > + struct gpio_desc *gpio_enable; > + struct gpio_desc *gpio_wake; > const struct pixcir_i2c_chip_data *chip; > int max_fingers; /* Max fingers supported in this instance */ > bool running; > @@ -208,6 +210,11 @@ static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts, > struct device *dev = &ts->client->dev; > int ret; > > + if (mode == PIXCIR_POWER_ACTIVE || mode == PIXCIR_POWER_IDLE) { > + if (!IS_ERR_OR_NULL(ts->gpio_wake)) > + gpiod_set_value_cansleep(ts->gpio_wake, 1); > + } > + > ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE); > if (ret < 0) { > dev_err(dev, "%s: can't read reg 0x%x : %d\n", > @@ -228,6 +235,11 @@ static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts, > return ret; > } > > + if (mode == PIXCIR_POWER_HALT) { > + if (!IS_ERR_OR_NULL(ts->gpio_wake)) > + gpiod_set_value_cansleep(ts->gpio_wake, 0); > + } > + > return 0; > } > > @@ -302,6 +314,11 @@ static int pixcir_start(struct pixcir_i2c_ts_data *ts) > struct device *dev = &ts->client->dev; > int error; > > + if (!IS_ERR_OR_NULL(ts->gpio_enable)) { > + gpiod_set_value_cansleep(ts->gpio_enable, 1); > + msleep(100); > + } > + > /* LEVEL_TOUCH interrupt with active low polarity */ > error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0); > if (error) { > @@ -343,6 +360,9 @@ static int pixcir_stop(struct pixcir_i2c_ts_data *ts) > /* Wait till running ISR is complete */ > synchronize_irq(ts->client->irq); > > + if (!IS_ERR_OR_NULL(ts->gpio_enable)) > + gpiod_set_value_cansleep(ts->gpio_enable, 0); > + > return 0; > } > > @@ -534,6 +554,24 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client, > return error; > } > > + tsdata->gpio_wake = devm_gpiod_get_optional(dev, "wake", > + GPIOD_OUT_HIGH); > + if (IS_ERR(tsdata->gpio_wake)) { > + error = PTR_ERR(tsdata->gpio_wake); > + if (error != -EPROBE_DEFER) > + dev_err(dev, "Failed to get wake gpio: %d\n", error); > + return error; > + } > + > + tsdata->gpio_enable = devm_gpiod_get_optional(dev, "enable", > + GPIOD_OUT_HIGH); > + if (IS_ERR(tsdata->gpio_enable)) { > + error = PTR_ERR(tsdata->gpio_enable); > + if (error != -EPROBE_DEFER) > + dev_err(dev, "Failed to get enable gpio: %d\n", error); > + return error; > + } > + > error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr, > IRQF_TRIGGER_FALLING | IRQF_ONESHOT, > client->name, tsdata); > @@ -542,6 +580,14 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client, > return error; > } > > + if (!IS_ERR_OR_NULL(tsdata->gpio_wake)) > + gpiod_set_value_cansleep(tsdata->gpio_wake, 1); > + > + if (!IS_ERR_OR_NULL(tsdata->gpio_enable)) { > + gpiod_set_value_cansleep(tsdata->gpio_enable, 1); > + msleep(100); > + } Actually, another question: why do we need this calls to activate wake and enable gpios here if we request them as active? Thanks. > + > pixcir_reset(tsdata); > > /* Always be in IDLE mode to save power, device supports auto wake */ > -- > 2.5.0 > -- Dmitry