Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933281AbbKMUhZ (ORCPT ); Fri, 13 Nov 2015 15:37:25 -0500 Received: from mo4-p00-ob.smtp.rzone.de ([81.169.146.162]:33129 "EHLO mo4-p00-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932695AbbKMUgD (ORCPT ); Fri, 13 Nov 2015 15:36:03 -0500 X-RZG-AUTH: :JGIXVUS7cutRB/49FwqZ7WcecEarQROEYabkiUo6mSAGQ+qKIDwoJUOY X-RZG-CLASS-ID: mo00 From: "H. Nikolaus Schaller" To: Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , =?UTF-8?q?Beno=C3=AEt=20Cousson?= , Tony Lindgren , Russell King , Dmitry Torokhov , "H. Nikolaus Schaller" , Hans Verkuil , Mauro Carvalho Chehab , Sebastian Reichel , Haibo Chen , Andrey Gelman , Igor Grinberg , Aaron Sierra , Krzysztof Kozlowski Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, gta04-owner@goldelico.com, linux-input@vger.kernel.org Subject: [PATCH v2 3/8] drivers:input:tsc2007: add iio interface to read external ADC input, temperature and raw conversion values Date: Fri, 13 Nov 2015 21:35:54 +0100 Message-Id: <5bcd56afc1c10982812012209ba32941dc99b6e9.1447446957.git.hns@goldelico.com> X-Mailer: git-send-email 2.5.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7219 Lines: 256 The tsc2007 chip not only has a resistive touch screen controller but also an external AUX adc imput which can be used for an ambient light sensor, battery voltage monitoring or any general purpose. Additionally it can measure the chip temperature. This driver provides an iio interface for these adc channels in addition to the raw x, y, z values and the estimated touch screen resistance. This can be used for debugging or special applications. Signed-off-by: H. Nikolaus Schaller --- drivers/input/touchscreen/Kconfig | 1 + drivers/input/touchscreen/tsc2007.c | 137 +++++++++++++++++++++++++++++++++++- 2 files changed, 136 insertions(+), 2 deletions(-) diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index deb14c1..b437ead 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -941,6 +941,7 @@ config TOUCHSCREEN_TSC2005 config TOUCHSCREEN_TSC2007 tristate "TSC2007 based touchscreens" depends on I2C + select IIO help Say Y here if you have a TSC2007 based touchscreen. diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c index 1a8a79d..4d3c995 100644 --- a/drivers/input/touchscreen/tsc2007.c +++ b/drivers/input/touchscreen/tsc2007.c @@ -30,6 +30,9 @@ #include #include #include +#include +#include +#include #define TSC2007_MEASURE_TEMP0 (0x0 << 4) #define TSC2007_MEASURE_AUX (0x2 << 4) @@ -61,6 +64,16 @@ #define READ_X (ADC_ON_12BIT | TSC2007_MEASURE_X) #define PWRDOWN (TSC2007_12BIT | TSC2007_POWER_OFF_IRQ_EN) +#define TSC2007_CHAN_IIO(_chan, _name, _type, _chan_info) \ +{ \ + .datasheet_name = _name, \ + .type = _type, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(_chan_info), \ + .indexed = 1, \ + .channel = _chan, \ +} + struct ts_event { u16 x; u16 y; @@ -69,9 +82,11 @@ struct ts_event { struct tsc2007 { struct input_dev *input; + struct iio_dev *indio; char phys[32]; struct i2c_client *client; + struct mutex mlock; u16 model; u16 x_plate_ohms; @@ -192,7 +207,10 @@ static irqreturn_t tsc2007_soft_irq(int irq, void *handle) while (!ts->stopped && tsc2007_is_pen_down(ts)) { /* pen is down, continue with the measurement */ + + mutex_lock(&ts->mlock); tsc2007_read_values(ts, &tc); + mutex_unlock(&ts->mlock); rt = tsc2007_calculate_resistance(ts, &tc); @@ -340,6 +358,86 @@ static void tsc2007_close(struct input_dev *input_dev) tsc2007_stop(ts); } +static const struct iio_chan_spec tsc2007_iio_channel[] = { + TSC2007_CHAN_IIO(0, "x", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), + TSC2007_CHAN_IIO(1, "y", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), + TSC2007_CHAN_IIO(2, "z1", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), + TSC2007_CHAN_IIO(3, "z2", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), + TSC2007_CHAN_IIO(4, "adc", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), + TSC2007_CHAN_IIO(5, "rt", IIO_VOLTAGE, IIO_CHAN_INFO_RAW), /* Ohms? */ + TSC2007_CHAN_IIO(6, "pen", IIO_PRESSURE, IIO_CHAN_INFO_RAW), + TSC2007_CHAN_IIO(7, "temp0", IIO_TEMP, IIO_CHAN_INFO_RAW), + TSC2007_CHAN_IIO(8, "temp1", IIO_TEMP, IIO_CHAN_INFO_RAW), +}; + +static int tsc2007_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, int *val2, long mask) +{ + struct tsc2007 *tsc = iio_priv(indio_dev); + int adc_chan = chan->channel; + int ret = 0; + + if (adc_chan >= ARRAY_SIZE(tsc2007_iio_channel)) + return -EINVAL; + + if (mask != IIO_CHAN_INFO_RAW) + return -EINVAL; + + mutex_lock(&tsc->mlock); + + switch (chan->channel) { + case 0: + *val = tsc2007_xfer(tsc, READ_X); + break; + case 1: + *val = tsc2007_xfer(tsc, READ_Y); + break; + case 2: + *val = tsc2007_xfer(tsc, READ_Z1); + break; + case 3: + *val = tsc2007_xfer(tsc, READ_Z2); + break; + case 4: + *val = tsc2007_xfer(tsc, (ADC_ON_12BIT | TSC2007_MEASURE_AUX)); + break; + case 5: { + struct ts_event tc; + + tc.x = tsc2007_xfer(tsc, READ_X); + tc.z1 = tsc2007_xfer(tsc, READ_Z1); + tc.z2 = tsc2007_xfer(tsc, READ_Z2); + *val = tsc2007_calculate_resistance(tsc, &tc); + break; + } + case 6: + *val = tsc2007_is_pen_down(tsc); + break; + case 7: + *val = tsc2007_xfer(tsc, + (ADC_ON_12BIT | TSC2007_MEASURE_TEMP0)); + break; + case 8: + *val = tsc2007_xfer(tsc, + (ADC_ON_12BIT | TSC2007_MEASURE_TEMP1)); + break; + } + + /* Prepare for next touch reading - power down ADC, enable PENIRQ */ + tsc2007_xfer(tsc, PWRDOWN); + + mutex_unlock(&tsc->mlock); + + ret = IIO_VAL_INT; + + return ret; +} + +static const struct iio_info tsc2007_iio_info = { + .read_raw = tsc2007_read_raw, + .driver_module = THIS_MODULE, +}; + #ifdef CONFIG_OF static int tsc2007_get_pendown_state_gpio(struct device *dev) { @@ -473,15 +571,20 @@ static int tsc2007_probe(struct i2c_client *client, const struct tsc2007_platform_data *pdata = dev_get_platdata(&client->dev); struct tsc2007 *ts; struct input_dev *input_dev; + struct iio_dev *indio_dev; int err; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_WORD_DATA)) return -EIO; - ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL); - if (!ts) + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*ts)); + if (!indio_dev) { + dev_err(&client->dev, "iio_device_alloc failed\n"); return -ENOMEM; + } + + ts = iio_priv(indio_dev); input_dev = devm_input_allocate_device(&client->dev); if (!input_dev) @@ -489,10 +592,26 @@ static int tsc2007_probe(struct i2c_client *client, i2c_set_clientdata(client, ts); + indio_dev->name = "tsc2007"; + indio_dev->dev.parent = &client->dev; + indio_dev->info = &tsc2007_iio_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = tsc2007_iio_channel; + indio_dev->num_channels = ARRAY_SIZE(tsc2007_iio_channel); + + err = iio_device_register(indio_dev); + if (err < 0) { + dev_err(&client->dev, "iio_device_register() failed: %d\n", + err); + return err; + } + ts->client = client; ts->irq = client->irq; ts->input = input_dev; + ts->indio = indio_dev; init_waitqueue_head(&ts->wait); + mutex_init(&ts->mlock); snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&client->dev)); @@ -566,6 +685,19 @@ static int tsc2007_probe(struct i2c_client *client, return 0; } +static int tsc2007_remove(struct i2c_client *client) +{ + struct tsc2007 *ts = i2c_get_clientdata(client); + struct input_dev *input_dev = ts->input; + struct iio_dev *indio_dev = ts->indio; + + input_unregister_device(input_dev); + + iio_device_unregister(indio_dev); + + return 0; +} + static const struct i2c_device_id tsc2007_idtable[] = { { "tsc2007", 0 }, { } @@ -588,6 +720,7 @@ static struct i2c_driver tsc2007_driver = { }, .id_table = tsc2007_idtable, .probe = tsc2007_probe, + .remove = tsc2007_remove, }; module_i2c_driver(tsc2007_driver); -- 2.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/