On Tue, Dec 15, 2015 at 3:03 AM, Adriana Reus <adriana.reus@xxxxxxxxx> wrote: > > > On 15.12.2015 11:26, Matt Ranostay wrote: >> >> Add support for the Atlas Scientific pH-SM chemical sensor that can >> detect pH levels of solutions in the range of 0-14. >> >> Signed-off-by: Matt Ranostay <mranostay@xxxxxxxxx> >> --- >> .../bindings/iio/chemical/atlas,ph-sm.txt | 22 ++ >> drivers/iio/chemical/Kconfig | 13 + >> drivers/iio/chemical/Makefile | 1 + >> drivers/iio/chemical/atlas-ph-sensor.c | 431 >> +++++++++++++++++++++ >> 4 files changed, 467 insertions(+) >> create mode 100644 >> Documentation/devicetree/bindings/iio/chemical/atlas,ph-sm.txt >> create mode 100644 drivers/iio/chemical/atlas-ph-sensor.c >> >> diff --git >> a/Documentation/devicetree/bindings/iio/chemical/atlas,ph-sm.txt >> b/Documentation/devicetree/bindings/iio/chemical/atlas,ph-sm.txt >> new file mode 100644 >> index 0000000..cffa190 >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/iio/chemical/atlas,ph-sm.txt >> @@ -0,0 +1,22 @@ >> +* Atlas Scientific pH-SM OEM sensor >> + >> >> +http://www.atlas-scientific.com/_files/_datasheets/_oem/pH_oem_datasheet.pdf >> + >> +Required properties: >> + >> + - compatible: must be "atlas,ph-sm" >> + - reg: the I2C address of the sensor >> + - interrupt-parent: should be the phandle for the interrupt controller >> + - interrupts: the sole interrupt generated by the device >> + >> + Refer to interrupt-controller/interrupts.txt for generic interrupt >> client >> + node bindings. >> + >> +Example: >> + >> +atlas@65 { >> + compatible = "atlas,ph-sm"; >> + reg = <0x65>; >> + interrupt-parent = <&gpio1>; >> + interrupts = <16 2>; >> +}; >> diff --git a/drivers/iio/chemical/Kconfig b/drivers/iio/chemical/Kconfig >> index 3061b72..a358e4b 100644 >> --- a/drivers/iio/chemical/Kconfig >> +++ b/drivers/iio/chemical/Kconfig >> @@ -4,6 +4,19 @@ >> >> menu "Chemical Sensors" >> >> +config ATLAS_PH_SENSOR >> + tristate "Atlas Scientific OEM pH-SM sensor" >> + depends on I2C >> + select REGMAP_I2C >> + select IIO_BUFFER >> + select IIO_TRIGGERED_BUFFER >> + help >> + Say Y here to build I2C interface support for the Atlas >> + Scientific OEM pH-SM sensor. >> + >> + To compile this driver as module, choose M here: the >> + module will be called atlas-ph-sensor. >> + >> config VZ89X >> tristate "SGX Sensortech MiCS VZ89X VOC sensor" >> depends on I2C >> diff --git a/drivers/iio/chemical/Makefile b/drivers/iio/chemical/Makefile >> index 7292f2d..e9eb852 100644 >> --- a/drivers/iio/chemical/Makefile >> +++ b/drivers/iio/chemical/Makefile >> @@ -3,4 +3,5 @@ >> # >> >> # When adding new entries keep the list in alphabetical order >> +obj-$(CONFIG_ATLAS_PH_SENSOR) += atlas-ph-sensor.o >> obj-$(CONFIG_VZ89X) += vz89x.o >> diff --git a/drivers/iio/chemical/atlas-ph-sensor.c >> b/drivers/iio/chemical/atlas-ph-sensor.c >> new file mode 100644 >> index 0000000..63da26b >> --- /dev/null >> +++ b/drivers/iio/chemical/atlas-ph-sensor.c >> @@ -0,0 +1,431 @@ >> +/* >> + * atlas-ph-sensor.c - Support for Atlas Scientific OEM pH-SM sensor >> + * >> + * Copyright (C) 2015 Matt Ranostay <mranostay@xxxxxxxxx> >> + * >> + * This program is free software; you can redistribute it and/or modify >> + * it under the terms of the GNU General Public License as published by >> + * the Free Software Foundation; either version 2 of the License, or >> + * (at your option) any later version. >> + * >> + * This program is distributed in the hope that it will be useful, >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the >> + * GNU General Public License for more details. >> + * >> + */ >> + >> +#include <linux/module.h> >> +#include <linux/init.h> >> +#include <linux/interrupt.h> >> +#include <linux/delay.h> >> +#include <linux/mutex.h> >> +#include <linux/err.h> >> +#include <linux/irq.h> >> +#include <linux/gpio.h> >> +#include <linux/i2c.h> >> +#include <linux/regmap.h> >> +#include <linux/iio/iio.h> >> +#include <linux/iio/buffer.h> >> +#include <linux/iio/trigger.h> >> +#include <linux/iio/trigger_consumer.h> >> +#include <linux/iio/triggered_buffer.h> >> +#include <linux/pm_runtime.h> >> + >> +#define ATLAS_REGMAP_NAME "atlas_ph_regmap" >> +#define ATLAS_DRV_NAME "atlas_ph" >> + >> +#define ATLAS_REG_DEV_TYPE 0x00 >> +#define ATLAS_REG_DEV_VERSION 0x01 >> + >> +#define ATLAS_REG_INT_CONTROL 0x04 >> +#define ATLAS_REG_INT_CONTROL_EN BIT(2) >> + >> +#define ATLAS_REG_PWR_CONTROL 0x06 >> + >> +#define ATLAS_REG_TEMP_DATA 0x0e >> +#define ATLAS_REG_PH_DATA 0x16 >> + >> +#define ATLAS_PH_INT_TIME_IN_US 450000 >> + >> +struct atlas_data { >> + struct i2c_client *client; >> + struct iio_trigger *trig; >> + struct regmap *regmap; >> + >> + __be32 buffer[4]; /* 32-bit pH data + 32-bit pad + 64-bit >> timestamp */ >> +}; >> + >> +static bool atlas_is_volatile_reg(struct device *dev, unsigned int reg) >> +{ >> + if (reg == ATLAS_REG_INT_CONTROL) >> + return true; >> + >> + return false; >> +} >> + >> +static const struct regmap_config atlas_regmap_config = { >> + .name = ATLAS_REGMAP_NAME, >> + >> + .reg_bits = 8, >> + .val_bits = 8, >> + >> + .volatile_reg = atlas_is_volatile_reg, >> + .max_register = ATLAS_REG_PH_DATA + 4, >> + .cache_type = REGCACHE_FLAT, >> + >> +}; >> + >> +static const struct iio_chan_spec atlas_channels[] = { >> + { >> + .type = IIO_PH, >> + .info_mask_separate = >> + BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), >> + .scan_index = 0, >> + .scan_type = { >> + .sign = 'u', >> + .realbits = 32, >> + .storagebits = 32, >> + .endianness = IIO_BE, >> + }, >> + }, >> + { >> + .type = IIO_TEMP, >> + .address = ATLAS_REG_TEMP_DATA, >> + .info_mask_separate = >> + BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), >> + .output = 1, >> + .scan_index = -1 >> + }, >> +}; >> + >> +static int atlas_set_powermode(struct atlas_data *data, int on) >> +{ >> + return regmap_write(data->regmap, ATLAS_REG_PWR_CONTROL, on); >> +} >> + >> +static int atlas_set_interrupt(struct atlas_data *data, bool state) >> +{ >> + return regmap_update_bits(data->regmap, ATLAS_REG_INT_CONTROL, >> + ATLAS_REG_INT_CONTROL_EN, >> + state ? ATLAS_REG_INT_CONTROL_EN : 0); >> +} >> + >> +static int atlas_buffer_postenable(struct iio_dev *indio_dev) >> +{ >> + struct atlas_data *data = iio_priv(indio_dev); >> + >> + pm_runtime_get_sync(&data->client->dev); > > ^ pm_runtime_get_sync may return errors > >> + >> + return atlas_set_interrupt(data, true); >> +} >> + >> +static int atlas_buffer_predisable(struct iio_dev *indio_dev) >> +{ >> + struct atlas_data *data = iio_priv(indio_dev); >> + int ret; >> + >> + ret = atlas_set_interrupt(data, false); >> + if (ret) >> + return ret; >> + >> + pm_runtime_mark_last_busy(&data->client->dev); >> + return pm_runtime_put_autosuspend(&data->client->dev); >> +} >> + >> +static const struct iio_trigger_ops atlas_interrupt_trigger_ops = { >> + .owner = THIS_MODULE, >> +}; >> + >> +static const struct iio_buffer_setup_ops atlas_buffer_setup_ops = { >> + .postenable = atlas_buffer_postenable, >> + .predisable = atlas_buffer_predisable, >> +}; >> + >> +static irqreturn_t atlas_trigger_handler(int irq, void *private) >> +{ >> + struct iio_dev *indio_dev = private; >> + struct atlas_data *data = iio_priv(indio_dev); >> + int ret; >> + >> + ret = i2c_smbus_read_i2c_block_data(data->client, >> ATLAS_REG_PH_DATA, >> + sizeof(data->buffer[0]), (u8 *) >> &data->buffer); >> + >> + if (ret > 0) >> + iio_push_to_buffers_with_timestamp(indio_dev, >> data->buffer, >> + iio_get_time_ns()); >> + >> + iio_trigger_notify_done(indio_dev->trig); >> + >> + return IRQ_HANDLED; >> +} >> + >> +static irqreturn_t atlas_interrupt_handler(int irq, void *private) >> +{ >> + struct iio_dev *indio_dev = private; >> + struct atlas_data *data = iio_priv(indio_dev); >> + >> + /* re-enable interrupt */ >> + atlas_set_interrupt(data, true); >> + >> + return IRQ_HANDLED; >> +} >> + >> +static int atlas_read_ph_measurement(struct atlas_data *data, __be32 >> *val) >> +{ >> + struct device *dev = &data->client->dev; >> + int suspended = pm_runtime_suspended(dev); >> + int ret; >> + >> + ret = pm_runtime_get_sync(dev); >> + if (ret) >> + return ret; > > ^ pm_runtime_get_sync can also return 1 (if the device is already > active).. in which case you definitely don't want to return here. > Also if this does return an error you may want to call put_noidle > because get_sync increments the device usage_count before it tries to > resume and you can end up with an unbalanced count there. >> >> + >> + if (suspended) >> + usleep_range(ATLAS_PH_INT_TIME_IN_US, >> + ATLAS_PH_INT_TIME_IN_US + 100000); >> + >> + ret = i2c_smbus_read_i2c_block_data(data->client, >> ATLAS_REG_PH_DATA, >> + sizeof(*val), (u8 *) val); >> + >> + pm_runtime_mark_last_busy(dev); >> + pm_runtime_put_autosuspend(dev); > > ^ also may return err code What would be proper handling of it here though? *_put_noidle ? > >> + >> + return ret == sizeof(*val) ? 0 : -EINVAL; >> +} >> + >> +static int atlas_read_raw(struct iio_dev *indio_dev, >> + struct iio_chan_spec const *chan, >> + int *val, int *val2, long mask) >> +{ >> + struct atlas_data *data = iio_priv(indio_dev); >> + >> + switch (mask) { >> + case IIO_CHAN_INFO_RAW: { >> + int ret; >> + __be32 reg; >> + >> + mutex_lock(&indio_dev->mlock); >> + >> + if (iio_buffer_enabled(indio_dev)) { >> + ret = -EBUSY; >> + goto error_busy; >> + } >> + >> + switch (chan->type) { >> + case IIO_TEMP: >> + ret = regmap_bulk_read(data->regmap, >> chan->address, >> + (u8 *) ®, sizeof(reg)); > > ^ what would happen if temp is read while the chip is suspended > runtime-pm wise? Unless I am missing something the chip may be powered > off at this point. > >> + break; >> + case IIO_PH: >> + ret = atlas_read_ph_measurement(data, ®); >> + break; >> + default: >> + ret = -EINVAL; >> + } >> + >> + if (!ret) { >> + *val = be32_to_cpu(reg); >> + ret = IIO_VAL_INT; >> + } >> +error_busy: >> + mutex_unlock(&indio_dev->mlock); >> + return ret; >> + } >> + case IIO_CHAN_INFO_SCALE: >> + *val = 0; /* 0.001 */ >> + *val2 = 1000; >> + return IIO_VAL_INT_PLUS_MICRO; >> + } >> + >> + return -EINVAL; >> +} >> + >> +static int atlas_write_raw(struct iio_dev *indio_dev, >> + struct iio_chan_spec const *chan, >> + int val, int val2, long mask) >> +{ >> + struct atlas_data *data = iio_priv(indio_dev); >> + __be32 reg = cpu_to_be32(val); >> + >> + if (val2 != 0) >> + return -EINVAL; >> + >> + if (mask != IIO_CHAN_INFO_RAW || chan->type != IIO_TEMP) >> + return -EINVAL; >> + >> + return regmap_bulk_write(data->regmap, chan->address, ®, 4); >> +} >> + >> +static const struct iio_info atlas_info = { >> + .driver_module = THIS_MODULE, >> + .read_raw = atlas_read_raw, >> + .write_raw = atlas_write_raw, >> +}; >> + >> +static int atlas_probe(struct i2c_client *client, >> + const struct i2c_device_id *id) >> +{ >> + struct atlas_data *data; >> + struct iio_trigger *trig; >> + struct iio_dev *indio_dev; >> + int ret; >> + >> + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); >> + if (!indio_dev) >> + return -ENOMEM; >> + >> + indio_dev->info = &atlas_info; >> + indio_dev->name = ATLAS_DRV_NAME; >> + indio_dev->channels = atlas_channels; >> + indio_dev->modes = INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE; >> + indio_dev->setup_ops = &atlas_buffer_setup_ops; >> + indio_dev->dev.parent = &client->dev; >> + >> + trig = devm_iio_trigger_alloc(&client->dev, "%s-dev%d", >> + indio_dev->name, indio_dev->id); >> + >> + if (!trig) >> + return -ENOMEM; >> + >> + data = iio_priv(indio_dev); >> + data->client = client; >> + data->trig = trig; >> + trig->dev.parent = indio_dev->dev.parent; >> + trig->ops = &atlas_interrupt_trigger_ops; >> + iio_trigger_set_drvdata(trig, indio_dev); >> + >> + i2c_set_clientdata(client, indio_dev); >> + >> + data->regmap = devm_regmap_init_i2c(client, &atlas_regmap_config); >> + if (IS_ERR(data->regmap)) { >> + dev_err(&client->dev, "regmap initialization failed\n"); >> + return PTR_ERR(data->regmap); >> + } >> + >> + ret = pm_runtime_set_active(&client->dev); >> + if (ret) >> + return ret; >> + >> + if (client->irq <= 0) { >> + dev_err(&client->dev, "no valid irq defined\n"); >> + return -EINVAL; >> + } >> + >> + ret = iio_trigger_register(trig); >> + if (ret) { >> + dev_err(&client->dev, "failed to register trigger\n"); >> + return ret; >> + } >> + >> + ret = iio_triggered_buffer_setup(indio_dev, NULL, >> + &atlas_trigger_handler, NULL); >> + >> + if (ret) { >> + dev_err(&client->dev, "cannot setup iio trigger\n"); >> + goto unregister_trigger; >> + } >> + >> + ret = devm_request_threaded_irq(&client->dev, client->irq, >> + NULL, atlas_interrupt_handler, >> + IRQF_TRIGGER_FALLING | >> IRQF_ONESHOT, >> + "atlas_irq", >> + indio_dev); >> + if (ret) { >> + dev_err(&client->dev, "request irq (%d) failed\n", >> client->irq); >> + goto unregister_buffer; >> + } >> + >> + ret = atlas_set_powermode(data, 1); >> + if (ret) { >> + dev_err(&client->dev, "cannot power device on"); >> + goto unregister_buffer; >> + } >> + >> + pm_runtime_enable(&client->dev); >> + pm_runtime_set_autosuspend_delay(&client->dev, 2500); >> + pm_runtime_use_autosuspend(&client->dev); >> + >> + ret = iio_device_register(indio_dev); >> + if (ret) { >> + dev_err(&client->dev, "unable to register device\n"); >> + goto unregister_buffer; >> + } >> + >> + return 0; >> + >> +unregister_buffer: >> + iio_triggered_buffer_cleanup(indio_dev); >> + >> +unregister_trigger: >> + iio_trigger_unregister(data->trig); >> + >> + return ret; >> +} >> + >> +static int atlas_remove(struct i2c_client *client) >> +{ >> + struct iio_dev *indio_dev = i2c_get_clientdata(client); >> + struct atlas_data *data = iio_priv(indio_dev); >> + >> + iio_device_unregister(indio_dev); >> + iio_triggered_buffer_cleanup(indio_dev); >> + iio_trigger_unregister(data->trig); >> + >> + pm_runtime_disable(&client->dev); >> + pm_runtime_set_suspended(&client->dev); >> + pm_runtime_put_noidle(&client->dev); >> + >> + return atlas_set_powermode(data, 0); >> +} >> + >> +#ifdef CONFIG_PM >> +static int atlas_runtime_suspend(struct device *dev) >> +{ >> + struct atlas_data *data = >> + iio_priv(i2c_get_clientdata(to_i2c_client(dev))); >> + >> + return atlas_set_powermode(data, 0); >> +} >> + >> +static int atlas_runtime_resume(struct device *dev) >> +{ >> + struct atlas_data *data = >> + iio_priv(i2c_get_clientdata(to_i2c_client(dev))); >> + >> + return atlas_set_powermode(data, 1); >> +} >> +#endif >> + >> +static const struct dev_pm_ops atlas_pm_ops = { >> + SET_RUNTIME_PM_OPS(atlas_runtime_suspend, >> + atlas_runtime_resume, NULL) >> +}; >> + >> +static const struct i2c_device_id atlas_id[] = { >> + { "atlas-ph-sm", 0 }, >> + {} >> +}; >> +MODULE_DEVICE_TABLE(i2c, atlas_id); >> + >> +static const struct of_device_id atlas_dt_ids[] = { >> + { .compatible = "atlas,ph-sm" }, >> + { } >> +}; >> +MODULE_DEVICE_TABLE(of, atlas_dt_ids); >> + >> +static struct i2c_driver atlas_driver = { >> + .driver = { >> + .name = ATLAS_DRV_NAME, >> + .of_match_table = of_match_ptr(atlas_dt_ids), >> + .pm = &atlas_pm_ops, >> + }, >> + .probe = atlas_probe, >> + .remove = atlas_remove, >> + .id_table = atlas_id, >> +}; >> +module_i2c_driver(atlas_driver); >> + >> +MODULE_AUTHOR("Matt Ranostay <mranostay@xxxxxxxxx>"); >> +MODULE_DESCRIPTION("Atlas Scientific pH-SM sensor"); >> +MODULE_LICENSE("GPL"); >> > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
