Received-SPF: TempError (protection.outlook.com: error in processing during
 lookup of topicproducts.com: DNS Timeout)
Authentication-Results-Original: dkim=none (message not signed)
 header.d=none;dmarc=none action=none header.from=topic.nl;
From:   Mike Looijmans <mike.looijmans@topic.nl>
To:     devicetree@vger.kernel.org, linux-iio@vger.kernel.org
CC:     Mike Looijmans <mike.looijmans@topic.nl>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Caleb Connolly <caleb.connolly@linaro.org>,
        ChiYuan Huang <cy_huang@richtek.com>,
        ChiaEn Wu <chiaen_wu@richtek.com>,
        Cosmin Tanislav <demonsingur@gmail.com>,
        Ibrahim Tilki <Ibrahim.Tilki@analog.com>,
        Jonathan Cameron <jic23@kernel.org>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Marcus Folkesson <marcus.folkesson@gmail.com>,
        Ramona Bolboaca <ramona.bolboaca@analog.com>,
        William Breathitt Gray <william.gray@linaro.org>,
        linux-kernel@vger.kernel.org
Subject: [PATCH v4 2/2] iio: adc: Add TI ADS1100 and ADS1000
Date:   Mon, 6 Mar 2023 14:13:12 +0100
Message-ID: <20230306131312.7170-2-mike.looijmans@topic.nl>
In-Reply-To: <20230306131312.7170-1-mike.looijmans@topic.nl>
References: <20230306131312.7170-1-mike.looijmans@topic.nl>
 <1b153bce-a66a-45ee-a5c6-963ea6fb1c82.949ef384-8293-46b8-903f-40a477c056ae.0270109b-145d-4024-b8ff-05d54be2ad97@emailsignatures365.codetwo.com>
Content-Type: text/plain
MIME-Version: 1.0
X-Microsoft-Antispam-Message-Info-Original: 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
X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DB8PR04MB6523.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230025)(4636009)(39830400003)(346002)(396003)(366004)(136003)(376002)(451199018)(8936002)(7416002)(5660300002)(30864003)(44832011)(66476007)(66556008)(66946007)(2906002)(8676002)(4326008)(54906003)(316002)(478600001)(52116002)(36756003)(6666004)(6512007)(1076003)(6506007)(966005)(6486002)(26005)(2616005)(41300700001)(83380400001)(83170400001)(42882007)(186003)(38350700002)(38100700002);DIR:OUT;SFP:1101;
X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR04MB8355
X-CodeTwo-MessageID: e913713f-5b1c-4b05-bfec-ed0996d7cbce.20230306131323@westeu12-emailsignatures-cloud.codetwo.com
X-CodeTwoProcessed: true
Content-Transfer-Encoding: quoted-printable
X-EOPAttributedMessage: 0
X-MS-Exchange-Transport-CrossTenantHeadersStripped: DB5EUR01FT107.eop-EUR01.prod.protection.outlook.com
X-MS-PublicTrafficType: Email
X-MS-Office365-Filtering-Correlation-Id-Prvs: 9f612e95-b1dc-445f-d4e2-08db1e448e49
X-Microsoft-Antispam: BCL:0;
X-Microsoft-Antispam-Message-Info: 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
X-Forefront-Antispam-Report: CIP:13.93.42.39;CTRY:NL;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:westeu12-emailsignatures-cloud.codetwo.com;PTR:westeu12-emailsignatures-cloud.codetwo.com;CAT:NONE;SFS:(13230025)(4636009)(136003)(39840400004)(376002)(396003)(346002)(451199018)(46966006)(36840700001)(36756003)(15974865002)(63350400001)(47076005)(83380400001)(478600001)(36860700001)(1076003)(26005)(6666004)(6486002)(966005)(6512007)(42882007)(2616005)(336012)(186003)(6506007)(8936002)(4326008)(70206006)(70586007)(40480700001)(41300700001)(2906002)(8676002)(5660300002)(44832011)(7416002)(30864003)(54906003)(7596003)(7636003)(356005)(83170400001)(316002)(82310400005);DIR:OUT;SFP:1101;
X-OriginatorOrg: topic.nl
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Mar 2023 13:13:25.7305
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 591674ff-765b-43d7-7509-08db1e449218
X-MS-Exchange-CrossTenant-Id: 449607a5-3517-482d-8d16-41dd868cbda3
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=449607a5-3517-482d-8d16-41dd868cbda3;Ip=[13.93.42.39];Helo=[westeu12-emailsignatures-cloud.codetwo.com]
X-MS-Exchange-CrossTenant-AuthSource: DB5EUR01FT107.eop-EUR01.prod.protection.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DUZPR04MB9968
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

The ADS1100 is a 16-bit ADC (at 8 samples per second).
The ADS1000 is similar, but has a fixed data rate.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>

---

Changes in v4:
Use post-increment
Formatting fixes (commas, indents, empty line)
Use 'ffs' and explain gain formula
Use dev_set_drvdata/dev_get_drvdata for pm_ methods
Use units.h for micro-to-milli conversion

Changes in v3:
Add #include linux/bitfield.h and linux/bits.h

Changes in v2:
Remove "driver for" from title
Use proper PM_RUNTIME macros
Fix indents
Use dev_err_probe()
Unsigned index and post-increment
Use GENMASK and FIELD_GET
remove ads1100_set_conv_mode
remove Kconfig BUFFER dependencies
remove unused #include
Set SCALE instead of HARDWAREGAIN
Use devm_add_action_or_reset

 drivers/iio/adc/Kconfig      |  10 +
 drivers/iio/adc/Makefile     |   1 +
 drivers/iio/adc/ti-ads1100.c | 442 +++++++++++++++++++++++++++++++++++
 3 files changed, 453 insertions(+)
 create mode 100644 drivers/iio/adc/ti-ads1100.c

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 63f80d747cbd..257efb25a92e 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -1207,6 +1207,16 @@ config TI_ADS1015
 	  This driver can also be built as a module. If so, the module will be
 	  called ti-ads1015.
=20
+config TI_ADS1100
+	tristate "Texas Instruments ADS1100 and ADS1000 ADC"
+	depends on I2C
+	help
+	  If you say yes here you get support for Texas Instruments ADS1100 and
+	  ADS1000 ADC chips.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called ti-ads1100.
+
 config TI_ADS7950
 	tristate "Texas Instruments ADS7950 ADC driver"
 	depends on SPI && GPIOLIB
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 4ef41a7dfac6..61ef600fab99 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -107,6 +107,7 @@ obj-$(CONFIG_TI_ADC108S102) +=3D ti-adc108s102.o
 obj-$(CONFIG_TI_ADC128S052) +=3D ti-adc128s052.o
 obj-$(CONFIG_TI_ADC161S626) +=3D ti-adc161s626.o
 obj-$(CONFIG_TI_ADS1015) +=3D ti-ads1015.o
+obj-$(CONFIG_TI_ADS1100) +=3D ti-ads1100.o
 obj-$(CONFIG_TI_ADS7950) +=3D ti-ads7950.o
 obj-$(CONFIG_TI_ADS8344) +=3D ti-ads8344.o
 obj-$(CONFIG_TI_ADS8688) +=3D ti-ads8688.o
diff --git a/drivers/iio/adc/ti-ads1100.c b/drivers/iio/adc/ti-ads1100.c
new file mode 100644
index 000000000000..2189634dccbf
--- /dev/null
+++ b/drivers/iio/adc/ti-ads1100.c
@@ -0,0 +1,442 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ADS1100 - Texas Instruments Analog-to-Digital Converter
+ *
+ * Copyright (c) 2023, Topic Embedded Products
+ *
+ * Datasheet: https://www.ti.com/lit/gpn/ads1100
+ * IIO driver for ADS1100 and ADS1000 ADC 16-bit I2C
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/property.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/units.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/types.h>
+
+/* The ADS1100 has a single byte config register */
+
+/* Conversion in progress bit */
+#define ADS1100_CFG_ST_BSY	BIT(7)
+/* Single conversion bit */
+#define ADS1100_CFG_SC		BIT(4)
+/* Data rate */
+#define ADS1100_DR_MASK		GENMASK(3, 2)
+/* Gain */
+#define ADS1100_PGA_MASK	GENMASK(1, 0)
+
+#define ADS1100_CONTINUOUS	0
+#define	ADS1100_SINGLESHOT	ADS1100_CFG_SC
+
+#define ADS1100_SLEEP_DELAY_MS	2000
+
+static const int ads1100_data_rate[] =3D {128, 32, 16, 8};
+static const int ads1100_data_rate_bits[] =3D {12, 14, 15, 16};
+
+struct ads1100_data {
+	struct i2c_client *client;
+	struct regulator *reg_vdd;
+	struct mutex lock;
+	int scale_avail[2 * 4]; /* 4 gain settings */
+	u8 config;
+	bool supports_data_rate; /* Only the ADS1100 can select the rate */
+};
+
+static const struct iio_chan_spec ads1100_channel =3D {
+	.type =3D IIO_VOLTAGE,
+	.info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW),
+	.info_mask_shared_by_all =3D
+				BIT(IIO_CHAN_INFO_SCALE) |
+				BIT(IIO_CHAN_INFO_SAMP_FREQ),
+	.info_mask_shared_by_all_available =3D
+				BIT(IIO_CHAN_INFO_SCALE) |
+				BIT(IIO_CHAN_INFO_SAMP_FREQ),
+	.scan_type =3D {
+		.sign =3D 's',
+		.realbits =3D 16,
+		.storagebits =3D 16,
+		.endianness =3D IIO_CPU,
+	},
+	.datasheet_name =3D "AIN",
+};
+
+static int ads1100_set_config_bits(struct ads1100_data *data, u8 mask, u8 =
value)
+{
+	int ret;
+	u8 config =3D (data->config & ~mask) | (value & mask);
+
+	if (data->config =3D=3D config)
+		return 0; /* Already done */
+
+	ret =3D i2c_master_send(data->client, &config, 1);
+	if (ret < 0)
+		return ret;
+
+	data->config =3D config;
+	return 0;
+};
+
+static int ads1100_data_bits(struct ads1100_data *data)
+{
+	return ads1100_data_rate_bits[FIELD_GET(ADS1100_DR_MASK, data->config)];
+}
+
+static int ads1100_get_adc_result(struct ads1100_data *data, int chan, int=
 *val)
+{
+	int ret;
+	__be16 buffer;
+	s16 value;
+
+	if (chan !=3D 0)
+		return -EINVAL;
+
+	ret =3D pm_runtime_resume_and_get(&data->client->dev);
+	if (ret < 0)
+		return ret;
+
+	ret =3D i2c_master_recv(data->client, (char *)&buffer, sizeof(buffer));
+
+	pm_runtime_mark_last_busy(&data->client->dev);
+	pm_runtime_put_autosuspend(&data->client->dev);
+
+	if (ret < 0) {
+		dev_err(&data->client->dev, "I2C read fail: %d\n", ret);
+		return ret;
+	}
+
+	/* Value is always 16-bit 2's complement */
+	value =3D be16_to_cpu(buffer);
+	/* Shift result to compensate for bit resolution vs. sample rate */
+	value <<=3D 16 - ads1100_data_bits(data);
+	*val =3D sign_extend32(value, 15);
+
+	return 0;
+}
+
+static int ads1100_set_scale(struct ads1100_data *data, int val, int val2)
+{
+	int microvolts;
+	int gain;
+	int regval;
+
+	/* With Vdd between 2.7 and 5V, the scale is always below 1 */
+	if (val)
+		return -EINVAL;
+
+	if (!val2)
+		return -EINVAL;
+
+	microvolts =3D regulator_get_voltage(data->reg_vdd);
+	/*
+	 * val2 is in 'micro' units, n =3D val2 / 1000000
+	 * result must be millivolts, d =3D microvolts / 1000
+	 * the full-scale value is d/n, corresponds to 2^15,
+	 * hence the gain =3D (d / n) >> 15, factoring out the 1000 and moving th=
e
+	 * bitshift so everything fits in 32-bits yields this formula.
+	 */
+	gain =3D ((microvolts + BIT(14)) >> 15) * 1000 / val2;
+	if (gain <=3D 0 || gain > 8)
+		return -EINVAL;
+
+	regval =3D ffs(gain) - 1;
+	ads1100_set_config_bits(data, ADS1100_PGA_MASK, regval);
+	return 0;
+}
+
+static int ads1100_set_data_rate(struct ads1100_data *data, int chan, int =
rate)
+{
+	unsigned int i;
+	unsigned int size;
+
+	size =3D data->supports_data_rate ? ARRAY_SIZE(ads1100_data_rate) : 1;
+	for (i =3D 0; i < size; i++) {
+		if (ads1100_data_rate[i] =3D=3D rate)
+			return ads1100_set_config_bits(
+					data, ADS1100_DR_MASK,
+					FIELD_PREP(ADS1100_DR_MASK, i));
+	}
+
+	return -EINVAL;
+}
+
+static int ads1100_get_vdd_millivolts(struct ads1100_data *data)
+{
+	return regulator_get_voltage(data->reg_vdd) / (MICRO / MILLI);
+}
+
+static void ads1100_calc_scale_avail(struct ads1100_data *data)
+{
+	int millivolts =3D ads1100_get_vdd_millivolts(data);
+	unsigned int i;
+
+	for (i =3D 0; i < ARRAY_SIZE(data->scale_avail) / 2; i++) {
+		data->scale_avail[i * 2 + 0] =3D millivolts;
+		data->scale_avail[i * 2 + 1] =3D 15 + i;
+	}
+}
+
+static int ads1100_read_avail(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      const int **vals, int *type, int *length,
+			      long mask)
+{
+	struct ads1100_data *data =3D iio_priv(indio_dev);
+
+	if (chan->type !=3D IIO_VOLTAGE)
+		return -EINVAL;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*type =3D IIO_VAL_INT;
+		*vals =3D ads1100_data_rate;
+		if (data->supports_data_rate)
+			*length =3D ARRAY_SIZE(ads1100_data_rate);
+		else
+			*length =3D 1;
+		return IIO_AVAIL_LIST;
+	case IIO_CHAN_INFO_SCALE:
+		*type =3D IIO_VAL_FRACTIONAL_LOG2;
+		*vals =3D data->scale_avail;
+		*length =3D ARRAY_SIZE(data->scale_avail);
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int ads1100_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan, int *val,
+			    int *val2, long mask)
+{
+	int ret;
+	struct ads1100_data *data =3D iio_priv(indio_dev);
+
+	mutex_lock(&data->lock);
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret =3D iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			break;
+
+		ret =3D ads1100_get_adc_result(data, chan->address, val);
+		if (ret >=3D 0)
+			ret =3D IIO_VAL_INT;
+		iio_device_release_direct_mode(indio_dev);
+		break;
+	case IIO_CHAN_INFO_SCALE:
+		/* full-scale is the supply voltage in millivolts */
+		*val =3D ads1100_get_vdd_millivolts(data);
+		*val2 =3D 15 + FIELD_GET(ADS1100_PGA_MASK, data->config);
+		ret =3D IIO_VAL_FRACTIONAL_LOG2;
+		break;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*val =3D ads1100_data_rate[FIELD_GET(ADS1100_DR_MASK,
+						   data->config)];
+		ret =3D IIO_VAL_INT;
+		break;
+	default:
+		ret =3D -EINVAL;
+		break;
+	}
+	mutex_unlock(&data->lock);
+
+	return ret;
+}
+
+static int ads1100_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan, int val,
+			     int val2, long mask)
+{
+	struct ads1100_data *data =3D iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&data->lock);
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		ret =3D ads1100_set_scale(data, val, val2);
+		break;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		ret =3D ads1100_set_data_rate(data, chan->address, val);
+		break;
+	default:
+		ret =3D -EINVAL;
+		break;
+	}
+	mutex_unlock(&data->lock);
+
+	return ret;
+}
+
+static const struct iio_info ads1100_info =3D {
+	.read_avail	=3D ads1100_read_avail,
+	.read_raw	=3D ads1100_read_raw,
+	.write_raw	=3D ads1100_write_raw,
+};
+
+static int ads1100_setup(struct ads1100_data *data)
+{
+	int ret;
+	u8 buffer[3];
+
+	/* Setup continuous sampling mode at 8sps */
+	buffer[0] =3D ADS1100_DR_MASK | ADS1100_CONTINUOUS;
+	ret =3D i2c_master_send(data->client, buffer, 1);
+	if (ret < 0)
+		return ret;
+
+	ret =3D i2c_master_recv(data->client, buffer, sizeof(buffer));
+	if (ret < 0)
+		return ret;
+
+	/* Config register returned in third byte, strip away the busy status */
+	data->config =3D buffer[2] & ~ADS1100_CFG_ST_BSY;
+
+	/* Detect the sample rate capability by checking the DR bits */
+	data->supports_data_rate =3D FIELD_GET(ADS1100_DR_MASK, buffer[2]) !=3D 0=
;
+
+	return 0;
+}
+
+static void ads1100_reg_disable(void *reg)
+{
+	regulator_disable(reg);
+}
+
+static void ads1100_disable_continuous(void *data)
+{
+	ads1100_set_config_bits(data, ADS1100_CFG_SC, ADS1100_SINGLESHOT);
+}
+
+static int ads1100_probe(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev;
+	struct ads1100_data *data;
+	struct device *dev =3D &client->dev;
+	int ret;
+
+	indio_dev =3D devm_iio_device_alloc(dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	data =3D iio_priv(indio_dev);
+	dev_set_drvdata(dev, data);
+	data->client =3D client;
+	mutex_init(&data->lock);
+
+	indio_dev->name =3D "ads1100";
+	indio_dev->modes =3D INDIO_DIRECT_MODE;
+	indio_dev->channels =3D &ads1100_channel;
+	indio_dev->num_channels =3D 1;
+	indio_dev->info =3D &ads1100_info;
+
+	data->reg_vdd =3D devm_regulator_get(dev, "vdd");
+	if (IS_ERR(data->reg_vdd))
+		return dev_err_probe(dev, PTR_ERR(data->reg_vdd),
+				     "Failed to get vdd regulator\n");
+
+	ret =3D regulator_enable(data->reg_vdd);
+	if (ret < 0)
+		return dev_err_probe(dev, PTR_ERR(data->reg_vdd),
+				     "Failed to enable vdd regulator\n");
+
+	ret =3D devm_add_action_or_reset(dev, ads1100_reg_disable, data->reg_vdd)=
;
+	if (ret)
+		return ret;
+
+	ret =3D ads1100_setup(data);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to communicate with device\n");
+
+	ret =3D devm_add_action_or_reset(dev, ads1100_disable_continuous, data);
+	if (ret)
+		return ret;
+
+	ads1100_calc_scale_avail(data);
+
+	pm_runtime_set_autosuspend_delay(dev, ADS1100_SLEEP_DELAY_MS);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_active(dev);
+	ret =3D devm_pm_runtime_enable(dev);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to enable pm_runtime\n");
+
+	ret =3D devm_iio_device_register(dev, indio_dev);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "Failed to register IIO device\n");
+
+	return 0;
+}
+
+static int ads1100_runtime_suspend(struct device *dev)
+{
+	struct ads1100_data *data =3D dev_get_drvdata(dev);
+
+	ads1100_set_config_bits(data, ADS1100_CFG_SC, ADS1100_SINGLESHOT);
+	regulator_disable(data->reg_vdd);
+
+	return 0;
+}
+
+static int ads1100_runtime_resume(struct device *dev)
+{
+	struct ads1100_data *data =3D dev_get_drvdata(dev);
+	int ret;
+
+	ret =3D regulator_enable(data->reg_vdd);
+	if (ret) {
+		dev_err(&data->client->dev, "Failed to enable Vdd\n");
+		return ret;
+	}
+
+	/*
+	 * We'll always change the mode bit in the config register, so there is
+	 * no need here to "force" a write to the config register. If the device
+	 * has been power-cycled, we'll re-write its config register now.
+	 */
+	return ads1100_set_config_bits(data, ADS1100_CFG_SC, ADS1100_CONTINUOUS);
+}
+
+static DEFINE_RUNTIME_DEV_PM_OPS(ads1100_pm_ops,
+				 ads1100_runtime_suspend,
+				 ads1100_runtime_resume,
+				 NULL);
+
+static const struct i2c_device_id ads1100_id[] =3D {
+	{ "ads1100" },
+	{ "ads1000" },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, ads1100_id);
+
+static const struct of_device_id ads1100_of_match[] =3D {
+	{ .compatible =3D "ti,ads1100" },
+	{ .compatible =3D "ti,ads1000" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, ads1100_of_match);
+
+static struct i2c_driver ads1100_driver =3D {
+	.driver =3D {
+		.name =3D "ads1100",
+		.of_match_table =3D ads1100_of_match,
+		.pm =3D pm_ptr(&ads1100_pm_ops),
+	},
+	.probe_new	=3D ads1100_probe,
+	.id_table	=3D ads1100_id,
+};
+module_i2c_driver(ads1100_driver);
+
+MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>");
+MODULE_DESCRIPTION("Texas Instruments ADS1100 ADC driver");
+MODULE_LICENSE("GPL");
--=20
2.17.1


Met vriendelijke groet / kind regards,=0A=
=0A=
Mike Looijmans=0A=
System Expert=0A=
=0A=
=0A=
TOPIC Embedded Products B.V.=0A=
Materiaalweg 4, 5681 RJ Best=0A=
The Netherlands=0A=
=0A=
T: +31 (0) 499 33 69 69=0A=
E: mike.looijmans@topicproducts.com=0A=
W: www.topic.nl=0A=
=0A=
Please consider the environment before printing this e-mail=0A=