Re: [PATCH 1/2] Input: add support for Semtech SX8654 I2C touchscreen controller
From: Dmitry Torokhov
Date: Fri Mar 06 2015 - 19:57:28 EST
On Fri, Mar 06, 2015 at 10:21:55AM -0800, Dmitry Torokhov wrote:
> On Fri, Mar 06, 2015 at 07:21:38PM +0100, Sébastien Szymanski wrote:
> > Signed-off-by: Sébastien Szymanski <sebastien.szymanski@xxxxxxxxxxxx>
> > ---
> > drivers/input/touchscreen/Kconfig | 11 ++
> > drivers/input/touchscreen/Makefile | 1 +
> > drivers/input/touchscreen/sx8654.c | 285 +++++++++++++++++++++++++++++++++++++
> > 3 files changed, 297 insertions(+)
> > create mode 100644 drivers/input/touchscreen/sx8654.c
> >
> > diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
> > index 5891752..6f713fd0 100644
> > --- a/drivers/input/touchscreen/Kconfig
> > +++ b/drivers/input/touchscreen/Kconfig
> > @@ -961,6 +961,17 @@ config TOUCHSCREEN_SUR40
> > To compile this driver as a module, choose M here: the
> > module will be called sur40.
> >
> > +config TOUCHSCREEN_SX8654
> > + tristate "Semtech SX8654 touchscreen"
> > + depends on I2C && OF
>
> Does it have to depend on OF? I do not see anything OF-specific there...
>
> No need to resumbit.
Applied with some cosmetic edits and DT bindings folded into this patch.
Thank you.
>
> > + help
> > + Say Y here if you have a Semtech SX8654 touchscreen controller.
> > +
> > + If unsure, say N
> > +
> > + To compile this driver as a module, choose M here: the
> > + module will be called sx8654.
> > +
> > config TOUCHSCREEN_TPS6507X
> > tristate "TPS6507x based touchscreens"
> > depends on I2C
> > diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
> > index 0242fea..a06a752 100644
> > --- a/drivers/input/touchscreen/Makefile
> > +++ b/drivers/input/touchscreen/Makefile
> > @@ -79,5 +79,6 @@ obj-$(CONFIG_TOUCHSCREEN_WM97XX_ATMEL) += atmel-wm97xx.o
> > obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o
> > obj-$(CONFIG_TOUCHSCREEN_WM97XX_ZYLONITE) += zylonite-wm97xx.o
> > obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o
> > +obj-$(CONFIG_TOUCHSCREEN_SX8654) += sx8654.o
> > obj-$(CONFIG_TOUCHSCREEN_TPS6507X) += tps6507x-ts.o
> > obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o
> > diff --git a/drivers/input/touchscreen/sx8654.c b/drivers/input/touchscreen/sx8654.c
> > new file mode 100644
> > index 0000000..58cc478
> > --- /dev/null
> > +++ b/drivers/input/touchscreen/sx8654.c
> > @@ -0,0 +1,285 @@
> > +/*
> > + * drivers/input/touchscreen/sx8654.c
> > + *
> > + * Copyright (c) 2015 Armadeus Systems
> > + * Sébastien Szymanski <sebastien.szymanski@xxxxxxxxxxxx>
> > + *
> > + * Using code from:
> > + * - sx865x.c
> > + * Copyright (c) 2013 U-MoBo Srl
> > + * Pierluigi Passaro <p.passaro@xxxxxxxxxx>
> > + * - sx8650.c
> > + * Copyright (c) 2009 Wayne Roberts
> > + * - tsc2007.c
> > + * Copyright (c) 2008 Kwangwoo Lee
> > + * - ads7846.c
> > + * Copyright (c) 2005 David Brownell
> > + * Copyright (c) 2006 Nokia Corporation
> > + * - corgi_ts.c
> > + * Copyright (C) 2004-2005 Richard Purdie
> > + * - omap_ts.[hc], ads7846.h, ts_osk.c
> > + * Copyright (C) 2002 MontaVista Software
> > + * Copyright (C) 2004 Texas Instruments
> > + * Copyright (C) 2005 Dirk Behme
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + */
> > +
> > +#include <linux/input.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/i2c.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/irq.h>
> > +
> > +/* register addresses */
> > +#define I2C_REG_TOUCH0 0x00
> > +#define I2C_REG_TOUCH1 0x01
> > +#define I2C_REG_CHANMASK 0x04
> > +#define I2C_REG_IRQMASK 0x22
> > +#define I2C_REG_IRQSRC 0x23
> > +#define I2C_REG_SOFTRESET 0x3f
> > +
> > +/* commands */
> > +#define CMD_READ_REGISTER 0x40
> > +#define CMD_MANUAL 0xc0
> > +#define CMD_PENTRG 0xe0
> > +
> > +/* value for I2C_REG_SOFTRESET */
> > +#define SOFTRESET_VALUE 0xde
> > +
> > +/* bits for I2C_REG_IRQSRC */
> > +#define IRQ_PENTOUCH_TOUCHCONVDONE 0x08
> > +#define IRQ_PENRELEASE 0x04
> > +
> > +/* bits for RegTouch1 */
> > +#define CONDIRQ 0x20
> > +#define FILT_7SA 0x03
> > +
> > +/* bits for I2C_REG_CHANMASK */
> > +#define CONV_X 0x80
> > +#define CONV_Y 0x40
> > +
> > +/* coordinates rate: higher nibble of CTRL0 register */
> > +#define RATE_MANUAL 0x00
> > +#define RATE_5000CPS 0xf0
> > +
> > +/* power delay: lower nibble of CTRL0 register */
> > +#define POWDLY_1_1MS 0x0b
> > +
> > +#define MAX_12BIT ((1 << 12) - 1)
> > +
> > +struct sx8654 {
> > + struct input_dev *input;
> > + struct i2c_client *client;
> > +};
> > +
> > +static irqreturn_t sx8654_irq(int irq, void *handle)
> > +{
> > + struct sx8654 *sx8654 = handle;
> > + u8 irqsrc;
> > + u8 data[4];
> > + unsigned int x, y;
> > + int retval;
> > +
> > + irqsrc = i2c_smbus_read_byte_data(sx8654->client,
> > + (CMD_READ_REGISTER | I2C_REG_IRQSRC));
> > + dev_dbg(&sx8654->client->dev, "irqsrc = 0x%x", irqsrc);
> > +
> > + if (irqsrc < 0)
> > + goto out;
> > +
> > + if (irqsrc & IRQ_PENRELEASE) {
> > + dev_dbg(&sx8654->client->dev, "pen release interrupt");
> > +
> > + input_report_key(sx8654->input, BTN_TOUCH, 0);
> > + input_sync(sx8654->input);
> > + }
> > +
> > + if (irqsrc & IRQ_PENTOUCH_TOUCHCONVDONE) {
> > + dev_dbg(&sx8654->client->dev, "pen touch interrupt");
> > +
> > + retval = i2c_master_recv(sx8654->client, data, sizeof(data));
> > + if (retval != sizeof(data))
> > + goto out;
> > +
> > + /* invalid data */
> > + if (unlikely(data[0] & 0x80 || data[2] & 0x80))
> > + goto out;
> > +
> > + x = ((data[0] & 0xf) << 8) | (data[1]);
> > + y = ((data[2] & 0xf) << 8) | (data[3]);
> > +
> > + input_report_abs(sx8654->input, ABS_X, x);
> > + input_report_abs(sx8654->input, ABS_Y, y);
> > + input_report_key(sx8654->input, BTN_TOUCH, 1);
> > + input_sync(sx8654->input);
> > +
> > + dev_dbg(&sx8654->client->dev, "point(%4d,%4d)\n", x, y);
> > + }
> > +
> > +out:
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static int sx8654_open(struct input_dev *dev)
> > +{
> > + struct sx8654 *sx8654 = input_get_drvdata(dev);
> > + struct i2c_client *client = sx8654->client;
> > + int error;
> > +
> > + /* enable pen trigger mode */
> > + error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0,
> > + (RATE_5000CPS | POWDLY_1_1MS));
> > + if (error < 0) {
> > + dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
> > + return -EIO;
> > + }
> > +
> > + error = i2c_smbus_write_byte(client, CMD_PENTRG);
> > + if (error < 0) {
> > + dev_err(&client->dev, "writing command CMD_PENTRG failed");
> > + return -EIO;
> > + }
> > +
> > + enable_irq(client->irq);
> > +
> > + return 0;
> > +}
> > +
> > +static void sx8654_close(struct input_dev *dev)
> > +{
> > + struct sx8654 *sx8654 = input_get_drvdata(dev);
> > + struct i2c_client *client = sx8654->client;
> > + int error;
> > +
> > + disable_irq(client->irq);
> > +
> > + /* enable manual mode mode */
> > + error = i2c_smbus_write_byte(client, CMD_MANUAL);
> > + if (error < 0) {
> > + dev_err(&client->dev, "writing command CMD_MANUAL failed");
> > + return;
> > + }
> > +
> > + error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, 0);
> > + if (error < 0) {
> > + dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
> > + return;
> > + }
> > +}
> > +
> > +static int sx8654_probe(struct i2c_client *client,
> > + const struct i2c_device_id *id)
> > +{
> > + struct sx8654 *sx8654;
> > + struct input_dev *input;
> > + int error;
> > +
> > + if (!i2c_check_functionality(client->adapter,
> > + I2C_FUNC_SMBUS_READ_WORD_DATA))
> > + return -ENXIO;
> > +
> > + sx8654 = devm_kzalloc(&client->dev, sizeof(*sx8654), GFP_KERNEL);
> > + if (!sx8654)
> > + return -ENOMEM;
> > +
> > + input = devm_input_allocate_device(&client->dev);
> > + if (!sx8654)
> > + return -ENOMEM;
> > +
> > + input->name = "SX8654 I2C Touchscreen";
> > + input->id.bustype = BUS_I2C;
> > + input->dev.parent = &client->dev;
> > + input->open = sx8654_open;
> > + input->close = sx8654_close;
> > +
> > + __set_bit(INPUT_PROP_DIRECT, input->propbit);
> > + input_set_capability(input, EV_KEY, BTN_TOUCH);
> > + input_set_abs_params(input, ABS_X, 0, MAX_12BIT, 0, 0);
> > + input_set_abs_params(input, ABS_Y, 0, MAX_12BIT, 0, 0);
> > +
> > + sx8654->client = client;
> > + sx8654->input = input;
> > +
> > + input_set_drvdata(sx8654->input, sx8654);
> > +
> > + error = i2c_smbus_write_byte_data(client, I2C_REG_SOFTRESET,
> > + SOFTRESET_VALUE);
> > + if (error < 0) {
> > + dev_err(&client->dev, "writing softreset value failed");
> > + return -EIO;
> > + }
> > +
> > + error = i2c_smbus_write_byte_data(client, I2C_REG_CHANMASK,
> > + (CONV_X | CONV_Y));
> > + if (error < 0) {
> > + dev_err(&client->dev, "writing to I2C_REG_CHANMASK failed");
> > + return -EIO;
> > + }
> > +
> > + error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK,
> > + (IRQ_PENTOUCH_TOUCHCONVDONE |
> > + IRQ_PENRELEASE));
> > + if (error < 0) {
> > + dev_err(&client->dev, "writing to I2C_REG_IRQMASK failed");
> > + return -EIO;
> > + }
> > +
> > + error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH1,
> > + (CONDIRQ | FILT_7SA));
> > + if (error < 0) {
> > + dev_err(&client->dev, "writing to I2C_REG_TOUCH1 failed");
> > + return -EIO;
> > + }
> > +
> > + error = devm_request_threaded_irq(&client->dev, client->irq,
> > + NULL, sx8654_irq,
> > + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> > + client->name, sx8654);
> > + if (error) {
> > + dev_err(&client->dev,
> > + "Failed to enable IRQ %d, error: %d\n",
> > + client->irq, error);
> > + return error;
> > + }
> > +
> > + /* Disable the IRQ, we'll enable it in sx8654_open() */
> > + disable_irq(client->irq);
> > +
> > + error = input_register_device(sx8654->input);
> > + if (error)
> > + return error;
> > +
> > + i2c_set_clientdata(client, sx8654);
> > + return 0;
> > +}
> > +
> > +static const struct of_device_id sx8654_of_match[] = {
> > + { .compatible = "semtech,sx8654", },
> > + { },
> > +};
> > +MODULE_DEVICE_TABLE(of, sx8654_of_match);
> > +
> > +static const struct i2c_device_id sx8654_id_table[] = {
> > + { "semtech_sx8654", 0 },
> > + { },
> > +};
> > +MODULE_DEVICE_TABLE(i2c, sx8654_id_table);
> > +
> > +static struct i2c_driver sx8654_driver = {
> > + .driver = {
> > + .name = "sx8654",
> > + .of_match_table = sx8654_of_match,
> > + },
> > +
> > + .id_table = sx8654_id_table,
> > + .probe = sx8654_probe,
> > +};
> > +module_i2c_driver(sx8654_driver);
> > +
> > +MODULE_AUTHOR("Sébastien Szymanski <sebastien.szymanski@xxxxxxxxxxxx>");
> > +MODULE_DESCRIPTION("Semtech SX8654 I2C Touchscreen Driver");
> > +MODULE_LICENSE("GPL");
> > --
> > 2.0.5
> >
>
> --
> Dmitry
--
Dmitry
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