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Date: Wed, 3 Feb 2016 17:00:22 -0800
From: Matt Ranostay <mranostay@...il.com>
To: Daniel Baluta <daniel.baluta@...el.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
lucas.demarchi@...el.com, mwelling@...e.org, linux@...ck-us.net,
eibach@...ys.de
Subject: Re: [PATCH v3] iio: adc: Add TI ADS1015 ADC driver support
On Wed, Feb 3, 2016 at 8:59 AM, Daniel Baluta <daniel.baluta@...el.com> wrote:
> The driver has sysfs readings with runtime PM support for power saving.
> It also offers buffer support that can be used together with IIO software
> triggers.
>
> Datasheet can be found here:
> http://www.ti.com.cn/cn/lit/ds/symlink/ads1015.pdf
>
> Signed-off-by: Daniel Baluta <daniel.baluta@...el.com>
> ---
> Changes since v2:
> * push locking out of the switch in write_raw
> * fix buf allocation in triggered buffer's handler
>
> Changes since v1:
> * addressed concerns about replacing the ads1015 hwmon driver
> * For the moment the IIO driver is compatible with hwmon
> driver (dt bindings) the only thing left is to also add
> support for ads1115.
> * DT bindings are described in Documentation/devicetree/
> bindings/hwmon/ads1015.txt. If needed will copy this file
> in a later patch to the IIO corresponding location.
> * addressed comments from Jonathan
> * added proper locking
> * added timestamp channel
> * removed magic constants
> * added some new lines to increase readability
> * used regmap_get_device instead of keeping a copy of
> i2c_client pointer.
> * used non-devm function to correct the cleanup order
>
> drivers/iio/adc/Kconfig | 13 +
> drivers/iio/adc/Makefile | 1 +
> drivers/iio/adc/ti-ads1015.c | 616 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 630 insertions(+)
> create mode 100644 drivers/iio/adc/ti-ads1015.c
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 60673b4..fad7e6a 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -370,6 +370,19 @@ config TI_ADC128S052
> This driver can also be built as a module. If so, the module will be
> called ti-adc128s052.
>
> +config TI_ADS1015
> + tristate "Texas Instruments ADS1015 ADC"
> + depends on I2C && !SENSORS_ADS1015
> + select REGMAP_I2C
> + select IIO_BUFFER
> + select IIO_TRIGGERED_BUFFER
> + help
> + If you say yes here you get support for Texas Instruments ADS1015
> + ADC chip.
> +
> + This driver can also be built as a module. If so, the module will be
> + called ti-ads1015.
> +
> config TI_ADS8688
> tristate "Texas Instruments ADS8688"
> depends on SPI && OF
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index fb57e12..2ff70a3 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -36,6 +36,7 @@ obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o
> obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o
> obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
> obj-$(CONFIG_TI_ADC128S052) += ti-adc128s052.o
> +obj-$(CONFIG_TI_ADS1015) += ti-ads1015.o
> obj-$(CONFIG_TI_ADS8688) += ti-ads8688.o
> obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o
> obj-$(CONFIG_TWL4030_MADC) += twl4030-madc.o
> diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
> new file mode 100644
> index 0000000..abe78d3
> --- /dev/null
> +++ b/drivers/iio/adc/ti-ads1015.c
> @@ -0,0 +1,616 @@
> +/*
> + * ADS1015 - Texas Instruments Analog-to-Digital Converter
> + *
> + * Copyright (c) 2016, Intel Corporation.
> + *
> + * This file is subject to the terms and conditions of version 2 of
> + * the GNU General Public License. See the file COPYING in the main
> + * directory of this archive for more details.
> + *
> + * IIO driver for ADS1015 ADC 7-bit I2C slave address:
> + * * 0x48 - ADDR connectd to Ground
typo here :).
> + * * 0x49 - ADDR connected to Vdd
> + * * 0x4A - ADDR connected to SDA
> + * * 0x4B - ADDR connected to SCL
> + */
> +
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/i2c.h>
> +#include <linux/regmap.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/mutex.h>
> +#include <linux/delay.h>
> +
> +#include <linux/i2c/ads1015.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/types.h>
> +#include <linux/iio/sysfs.h>
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/triggered_buffer.h>
> +#include <linux/iio/trigger_consumer.h>
> +
> +#define ADS1015_DRV_NAME "ads1015"
> +
> +#define ADS1015_CONV_REG 0x00
> +#define ADS1015_CFG_REG 0x01
> +
> +#define ADS1015_CFG_DR_SHIFT 5
> +#define ADS1015_CFG_MOD_SHIFT 8
> +#define ADS1015_CFG_PGA_SHIFT 9
> +#define ADS1015_CFG_MUX_SHIFT 12
> +
> +#define ADS1015_CFG_DR_MASK GENMASK(7, 5)
> +#define ADS1015_CFG_MOD_MASK BIT(8)
> +#define ADS1015_CFG_PGA_MASK GENMASK(11, 9)
> +#define ADS1015_CFG_MUX_MASK GENMASK(14, 12)
> +
> +/* device operating modes */
> +#define ADS1015_CONTINUOUS 0
> +#define ADS1015_SINGLESHOT 1
> +
> +#define ADS1015_SLEEP_DELAY_MS 2000
> +#define ADS1015_DEFAULT_PGA 2
> +#define ADS1015_DEFAULT_DATA_RATE 4
> +#define ADS1015_DEFAULT_CHAN 0
> +
> +enum ads1015_channels {
> + ADS1015_AIN0_AIN1 = 0,
> + ADS1015_AIN0_AIN3,
> + ADS1015_AIN1_AIN3,
> + ADS1015_AIN2_AIN3,
> + ADS1015_AIN0,
> + ADS1015_AIN1,
> + ADS1015_AIN2,
> + ADS1015_AIN3,
> + ADS1015_TIMESTAMP,
> +};
> +
> +static const unsigned int ads1015_data_rate[] = {
> + 128, 250, 490, 920, 1600, 2400, 3300, 3300
> +};
> +
> +static const struct {
> + int scale;
> + int uscale;
> +} ads1015_scale[] = {
> + {3, 0},
> + {2, 0},
> + {1, 0},
> + {0, 500000},
> + {0, 250000},
> + {0, 125000},
> + {0, 125000},
> + {0, 125000},
> +};
> +
> +#define ADS1015_V_CHAN(_chan, _addr) { \
> + .type = IIO_VOLTAGE, \
> + .indexed = 1, \
> + .address = _addr, \
> + .channel = _chan, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_SCALE) | \
> + BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> + .scan_index = _addr, \
> + .scan_type = { \
> + .sign = 's', \
> + .realbits = 12, \
> + .storagebits = 16, \
> + .shift = 4, \
> + .endianness = IIO_CPU, \
> + }, \
> +}
> +
> +#define ADS1015_V_DIFF_CHAN(_chan, _chan2, _addr) { \
> + .type = IIO_VOLTAGE, \
> + .differential = 1, \
> + .indexed = 1, \
> + .address = _addr, \
> + .channel = _chan, \
> + .channel2 = _chan2, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_SCALE) | \
> + BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> + .scan_index = _addr, \
> + .scan_type = { \
> + .sign = 's', \
> + .realbits = 12, \
> + .storagebits = 16, \
> + .shift = 4, \
> + .endianness = IIO_CPU, \
> + }, \
> +}
> +
> +struct ads1015_data {
> + struct regmap *regmap;
> + /*
> + * Protects ADC ops, e.g: concurrent sysfs/buffered
> + * data reads, configuration updates
> + */
> + struct mutex lock;
> + struct ads1015_channel_data channel_data[ADS1015_CHANNELS];
> +};
> +
> +static bool ads1015_is_writeable_reg(struct device *dev, unsigned int reg)
> +{
> + return (reg == ADS1015_CFG_REG);
> +}
> +
> +static const struct regmap_config ads1015_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 16,
> + .max_register = ADS1015_CFG_REG,
> + .writeable_reg = ads1015_is_writeable_reg,
> +};
> +
> +static const struct iio_chan_spec ads1015_channels[] = {
> + ADS1015_V_DIFF_CHAN(0, 1, ADS1015_AIN0_AIN1),
> + ADS1015_V_DIFF_CHAN(0, 3, ADS1015_AIN0_AIN3),
> + ADS1015_V_DIFF_CHAN(1, 3, ADS1015_AIN1_AIN3),
> + ADS1015_V_DIFF_CHAN(2, 3, ADS1015_AIN2_AIN3),
> + ADS1015_V_CHAN(0, ADS1015_AIN0),
> + ADS1015_V_CHAN(1, ADS1015_AIN1),
> + ADS1015_V_CHAN(2, ADS1015_AIN2),
> + ADS1015_V_CHAN(3, ADS1015_AIN3),
> + IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP),
> +};
> +
> +static int ads1015_set_power_state(struct ads1015_data *data, bool on)
> +{
> + int ret;
> + struct device *dev = regmap_get_device(data->regmap);
> +
> + if (on) {
> + ret = pm_runtime_get_sync(dev);
> + if (ret < 0)
> + pm_runtime_put_noidle(dev);
> + } else {
> + pm_runtime_mark_last_busy(dev);
> + ret = pm_runtime_put_autosuspend(dev);
> + }
> +
> + return ret;
> +}
> +
> +static
> +int ads1015_get_adc_result(struct ads1015_data *data, int chan, int *val)
> +{
> + int ret, pga, dr, conv_time;
> + bool change;
> +
> + if (chan < 0 || chan >= ADS1015_CHANNELS)
> + return -EINVAL;
> +
> + pga = data->channel_data[chan].pga;
> + dr = data->channel_data[chan].data_rate;
> +
> + ret = regmap_update_bits_check(data->regmap, ADS1015_CFG_REG,
> + ADS1015_CFG_MUX_MASK |
> + ADS1015_CFG_PGA_MASK,
> + chan << ADS1015_CFG_MUX_SHIFT |
> + pga << ADS1015_CFG_PGA_SHIFT,
> + &change);
> + if (ret < 0)
> + return ret;
> +
> + if (change) {
> + conv_time = DIV_ROUND_UP(USEC_PER_SEC, ads1015_data_rate[dr]);
> + usleep_range(conv_time, conv_time + 1);
> + }
> +
> + return regmap_read(data->regmap, ADS1015_CONV_REG, val);
> +}
> +
> +static irqreturn_t ads1015_trigger_handler(int irq, void *p)
> +{
> + struct iio_poll_func *pf = p;
> + struct iio_dev *indio_dev = pf->indio_dev;
> + struct ads1015_data *data = iio_priv(indio_dev);
> + s16 buf[8]; /* 1x s16 ADC val + 3x s16 padding + 4x s16 timestamp */
> + int chan, ret, res;
> +
> + memset(buf, 0, sizeof(buf));
> +
> + mutex_lock(&data->lock);
> + chan = find_first_bit(indio_dev->active_scan_mask,
> + indio_dev->masklength);
> + ret = ads1015_get_adc_result(data, chan, &res);
> + if (ret < 0) {
> + mutex_unlock(&data->lock);
> + goto err;
> + }
> +
> + buf[0] = res;
> + mutex_unlock(&data->lock);
> +
> + iio_push_to_buffers_with_timestamp(indio_dev, buf, iio_get_time_ns());
> +
> +err:
> + iio_trigger_notify_done(indio_dev->trig);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int ads1015_set_scale(struct ads1015_data *data, int chan,
> + int scale, int uscale)
> +{
> + int i, ret, rindex = -1;
> +
> + for (i = 0; i < ARRAY_SIZE(ads1015_scale); i++)
> + if (ads1015_scale[i].scale == scale &&
> + ads1015_scale[i].uscale == uscale) {
> + rindex = i;
> + break;
> + }
> + if (rindex < 0)
> + return -EINVAL;
> +
> + ret = regmap_update_bits(data->regmap, ADS1015_CFG_REG,
> + ADS1015_CFG_PGA_MASK,
> + rindex << ADS1015_CFG_PGA_SHIFT);
> + if (ret < 0)
> + return ret;
> +
> + data->channel_data[chan].pga = rindex;
> +
> + return 0;
> +}
> +
> +static int ads1015_set_data_rate(struct ads1015_data *data, int chan, int rate)
> +{
> + int i, ret, rindex = -1;
> +
> + for (i = 0; i < ARRAY_SIZE(ads1015_data_rate); i++)
> + if (ads1015_data_rate[i] == rate) {
> + rindex = i;
> + break;
> + }
> + if (rindex < 0)
> + return -EINVAL;
> +
> + ret = regmap_update_bits(data->regmap, ADS1015_CFG_REG,
> + ADS1015_CFG_DR_MASK,
> + rindex << ADS1015_CFG_DR_SHIFT);
> + if (ret < 0)
> + return ret;
> +
> + data->channel_data[chan].data_rate = rindex;
> +
> + return 0;
> +}
> +
> +static int ads1015_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan, int *val,
> + int *val2, long mask)
> +{
> + int ret, idx;
> + struct ads1015_data *data = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + mutex_lock(&data->lock);
> + if (iio_buffer_enabled(indio_dev)) {
> + mutex_unlock(&data->lock);
> + return -EBUSY;
> + }
> +
> + ret = ads1015_set_power_state(data, true);
> + if (ret < 0) {
> + mutex_unlock(&data->lock);
> + return ret;
> + }
> +
> + ret = ads1015_get_adc_result(data, chan->address, val);
> + if (ret < 0) {
> + ads1015_set_power_state(data, false);
> + mutex_unlock(&data->lock);
> + return ret;
> + }
> +
> + /* 12 bit res, D0 is bit 4 in conversion register */
> + *val = sign_extend32(*val >> 4, 11);
> +
> + ret = ads1015_set_power_state(data, false);
> + mutex_unlock(&data->lock);
> +
> + if (ret < 0)
> + return ret;
> +
> + return IIO_VAL_INT;
> + case IIO_CHAN_INFO_SCALE:
> + mutex_lock(&data->lock);
> + idx = data->channel_data[chan->address].pga;
> + *val = ads1015_scale[idx].scale;
> + *val2 = ads1015_scale[idx].uscale;
> + mutex_unlock(&data->lock);
> +
> + return IIO_VAL_INT_PLUS_MICRO;
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + mutex_lock(&data->lock);
> + idx = data->channel_data[chan->address].data_rate;
> + *val = ads1015_data_rate[idx];
> + mutex_unlock(&data->lock);
> +
> + return IIO_VAL_INT;
> + default:
> + break;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int ads1015_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan, int val,
> + int val2, long mask)
> +{
> + struct ads1015_data *data = iio_priv(indio_dev);
> + int ret;
> +
> + mutex_lock(&data->lock);
> + switch (mask) {
> + case IIO_CHAN_INFO_SCALE:
> + ret = ads1015_set_scale(data, chan->address, val, val2);
> + break;
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + ret = ads1015_set_data_rate(data, chan->address, val);
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> + mutex_unlock(&data->lock);
> +
> + return ret;
> +}
> +
> +static int ads1015_buffer_preenable(struct iio_dev *indio_dev)
> +{
> + return ads1015_set_power_state(iio_priv(indio_dev), true);
> +}
> +
> +static int ads1015_buffer_postdisable(struct iio_dev *indio_dev)
> +{
> + return ads1015_set_power_state(iio_priv(indio_dev), false);
> +}
> +
> +static const struct iio_buffer_setup_ops ads1015_buffer_setup_ops = {
> + .preenable = ads1015_buffer_preenable,
> + .postenable = iio_triggered_buffer_postenable,
> + .predisable = iio_triggered_buffer_predisable,
> + .postdisable = ads1015_buffer_postdisable,
> + .validate_scan_mask = &iio_validate_scan_mask_onehot,
> +};
> +
> +static IIO_CONST_ATTR(scale_available, "3 2 1 0.5 0.25 0.125");
> +static IIO_CONST_ATTR(sampling_frequency_available,
> + "128 250 490 920 1600 2400 3300");
> +
> +static struct attribute *ads1015_attributes[] = {
> + &iio_const_attr_scale_available.dev_attr.attr,
> + &iio_const_attr_sampling_frequency_available.dev_attr.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group ads1015_attribute_group = {
> + .attrs = ads1015_attributes,
> +};
> +
> +static const struct iio_info ads1015_info = {
> + .driver_module = THIS_MODULE,
> + .read_raw = ads1015_read_raw,
> + .write_raw = ads1015_write_raw,
> + .attrs = &ads1015_attribute_group,
> +};
> +
> +#ifdef CONFIG_OF
> +static int ads1015_get_channels_config_of(struct i2c_client *client)
> +{
> + struct ads1015_data *data = i2c_get_clientdata(client);
> + struct device_node *node;
> +
> + if (!client->dev.of_node ||
> + !of_get_next_child(client->dev.of_node, NULL))
> + return -EINVAL;
> +
> + for_each_child_of_node(client->dev.of_node, node) {
> + u32 pval;
> + unsigned int channel;
> + unsigned int pga = ADS1015_DEFAULT_PGA;
> + unsigned int data_rate = ADS1015_DEFAULT_DATA_RATE;
> +
> + if (of_property_read_u32(node, "reg", &pval)) {
> + dev_err(&client->dev, "invalid reg on %s\n",
> + node->full_name);
> + continue;
> + }
> +
> + channel = pval;
> + if (channel >= ADS1015_CHANNELS) {
> + dev_err(&client->dev,
> + "invalid channel index %d on %s\n",
> + channel, node->full_name);
> + continue;
> + }
> +
> + if (!of_property_read_u32(node, "ti,gain", &pval)) {
> + pga = pval;
> + if (pga > 6) {
> + dev_err(&client->dev, "invalid gain on %s\n",
> + node->full_name);
> + return -EINVAL;
> + }
> + }
> +
> + if (!of_property_read_u32(node, "ti,datarate", &pval)) {
> + data_rate = pval;
> + if (data_rate > 7) {
> + dev_err(&client->dev,
> + "invalid data_rate on %s\n",
> + node->full_name);
> + return -EINVAL;
> + }
> + }
> +
> + data->channel_data[channel].pga = pga;
> + data->channel_data[channel].data_rate = data_rate;
> + }
> +
> + return 0;
> +}
> +#endif
> +
> +static void ads1015_get_channels_config(struct i2c_client *client)
> +{
> + unsigned int k;
> +
> + struct iio_dev *indio_dev = i2c_get_clientdata(client);
> + struct ads1015_data *data = iio_priv(indio_dev);
> + struct ads1015_platform_data *pdata = dev_get_platdata(&client->dev);
> +
> + /* prefer platform data */
> + if (pdata) {
> + memcpy(data->channel_data, pdata->channel_data,
> + sizeof(data->channel_data));
> + return;
> + }
> +
> +#ifdef CONFIG_OF
> + if (!ads1015_get_channels_config_of(client))
> + return;
> +#endif
> + /* fallback on default configuration */
> + for (k = 0; k < ADS1015_CHANNELS; ++k) {
> + data->channel_data[k].pga = ADS1015_DEFAULT_PGA;
> + data->channel_data[k].data_rate = ADS1015_DEFAULT_DATA_RATE;
> + }
> +}
> +
> +static int ads1015_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct iio_dev *indio_dev;
> + struct ads1015_data *data;
> + int ret;
> +
> + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + data = iio_priv(indio_dev);
> + i2c_set_clientdata(client, indio_dev);
> +
> + mutex_init(&data->lock);
> +
> + indio_dev->dev.parent = &client->dev;
> + indio_dev->info = &ads1015_info;
> + indio_dev->name = ADS1015_DRV_NAME;
> + indio_dev->channels = ads1015_channels;
> + indio_dev->num_channels = ARRAY_SIZE(ads1015_channels);
> + indio_dev->modes = INDIO_DIRECT_MODE;
> +
> + /* we need this be keep the same ABI with hwmon ADS1015 driver */
> + ads1015_get_channels_config(client);
> +
> + data->regmap = devm_regmap_init_i2c(client, &ads1015_regmap_config);
> + if (IS_ERR(data->regmap)) {
> + dev_err(&client->dev, "Failed to allocate register map\n");
> + return PTR_ERR(data->regmap);
> + }
> +
> + ret = iio_triggered_buffer_setup(indio_dev, NULL,
> + ads1015_trigger_handler,
> + &ads1015_buffer_setup_ops);
> + if (ret < 0) {
> + dev_err(&client->dev, "iio triggered buffer setup failed\n");
> + return ret;
> + }
> + ret = pm_runtime_set_active(&client->dev);
> + if (ret)
> + goto err_buffer_cleanup;
> + pm_runtime_set_autosuspend_delay(&client->dev, ADS1015_SLEEP_DELAY_MS);
> + pm_runtime_use_autosuspend(&client->dev);
> + pm_runtime_enable(&client->dev);
> +
> + ret = iio_device_register(indio_dev);
> + if (ret < 0) {
> + dev_err(&client->dev, "Failed to register IIO device\n");
> + goto err_buffer_cleanup;
> + }
> +
> + return 0;
> +
> +err_buffer_cleanup:
> + iio_triggered_buffer_cleanup(indio_dev);
> +
> + return ret;
> +}
> +
> +static int ads1015_remove(struct i2c_client *client)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(client);
> + struct ads1015_data *data = iio_priv(indio_dev);
> +
> + iio_device_unregister(indio_dev);
> +
> + pm_runtime_disable(&client->dev);
> + pm_runtime_set_suspended(&client->dev);
> + pm_runtime_put_noidle(&client->dev);
> +
> + iio_triggered_buffer_cleanup(indio_dev);
> +
> + /* power down single shot mode */
> + return regmap_update_bits(data->regmap, ADS1015_CFG_REG,
> + ADS1015_CFG_MOD_MASK,
> + ADS1015_SINGLESHOT << ADS1015_CFG_MOD_SHIFT);
> +}
> +
> +#ifdef CONFIG_PM
> +static int ads1015_runtime_suspend(struct device *dev)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct ads1015_data *data = iio_priv(indio_dev);
> +
> + return regmap_update_bits(data->regmap, ADS1015_CFG_REG,
> + ADS1015_CFG_MOD_MASK,
> + ADS1015_SINGLESHOT << ADS1015_CFG_MOD_SHIFT);
> +}
> +
> +static int ads1015_runtime_resume(struct device *dev)
> +{
> + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
> + struct ads1015_data *data = iio_priv(indio_dev);
> +
> + return regmap_update_bits(data->regmap, ADS1015_CFG_REG,
> + ADS1015_CFG_MOD_MASK,
> + ADS1015_CONTINUOUS << ADS1015_CFG_MOD_SHIFT);
> +}
> +#endif
> +
> +static const struct dev_pm_ops ads1015_pm_ops = {
> + SET_RUNTIME_PM_OPS(ads1015_runtime_suspend,
> + ads1015_runtime_resume, NULL)
> +};
> +
> +static const struct i2c_device_id ads1015_id[] = {
> + {"ads1015", 0},
> + {}
> +};
> +MODULE_DEVICE_TABLE(i2c, ads1015_id);
> +
> +static struct i2c_driver ads1015_driver = {
> + .driver = {
> + .name = ADS1015_DRV_NAME,
> + .pm = &ads1015_pm_ops,
> + },
> + .probe = ads1015_probe,
> + .remove = ads1015_remove,
> + .id_table = ads1015_id,
> +};
> +
> +module_i2c_driver(ads1015_driver);
> +
> +MODULE_AUTHOR("Daniel Baluta <daniel.baluta@...el.com>");
> +MODULE_DESCRIPTION("Texas Instruments ADS1015 ADC driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.5.0
>
> --
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