text: /*
   * STMicroelectronics pressures driver
   *
   * Copyright 2013 STMicroelectronics Inc.
   *
   * Denis Ciocca <denis.ciocca@st.com>
   *
   * Licensed under the GPL-2.
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/slab.h>
  #include <linux/errno.h>
  #include <linux/types.h>
  #include <linux/mutex.h>
  #include <linux/interrupt.h>
  #include <linux/i2c.h>
  #include <linux/gpio.h>
  #include <linux/irq.h>
  #include <linux/delay.h>
  #include <linux/iio/iio.h>
  #include <linux/iio/sysfs.h>
  #include <linux/iio/trigger.h>
  #include <linux/iio/buffer.h>
  #include <asm/unaligned.h>
  
  #include <linux/iio/common/st_sensors.h>
  #include "st_pressure.h"
  
  #define ST_PRESS_LSB_PER_MBAR			4096UL
  #define ST_PRESS_KPASCAL_NANO_SCALE		(100000000UL / \
  						 ST_PRESS_LSB_PER_MBAR)
  #define ST_PRESS_LSB_PER_CELSIUS		480UL
  #define ST_PRESS_CELSIUS_NANO_SCALE		(1000000000UL / \
  						 ST_PRESS_LSB_PER_CELSIUS)
  #define ST_PRESS_NUMBER_DATA_CHANNELS		1
  
  /* FULLSCALE */
  #define ST_PRESS_FS_AVL_1260MB			1260
  
  #define ST_PRESS_1_OUT_XL_ADDR			0x28
  #define ST_TEMP_1_OUT_L_ADDR			0x2b
  
  /* CUSTOM VALUES FOR LPS331AP SENSOR */
  #define ST_PRESS_LPS331AP_WAI_EXP		0xbb
  #define ST_PRESS_LPS331AP_ODR_ADDR		0x20
  #define ST_PRESS_LPS331AP_ODR_MASK		0x70
  #define ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL	0x01
  #define ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL	0x05
  #define ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL	0x06
  #define ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL	0x07
  #define ST_PRESS_LPS331AP_PW_ADDR		0x20
  #define ST_PRESS_LPS331AP_PW_MASK		0x80
  #define ST_PRESS_LPS331AP_FS_ADDR		0x23
  #define ST_PRESS_LPS331AP_FS_MASK		0x30
  #define ST_PRESS_LPS331AP_FS_AVL_1260_VAL	0x00
  #define ST_PRESS_LPS331AP_FS_AVL_1260_GAIN	ST_PRESS_KPASCAL_NANO_SCALE
  #define ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN	ST_PRESS_CELSIUS_NANO_SCALE
  #define ST_PRESS_LPS331AP_BDU_ADDR		0x20
  #define ST_PRESS_LPS331AP_BDU_MASK		0x04
  #define ST_PRESS_LPS331AP_DRDY_IRQ_ADDR		0x22
  #define ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK	0x04
  #define ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK	0x20
  #define ST_PRESS_LPS331AP_MULTIREAD_BIT		true
  #define ST_PRESS_LPS331AP_TEMP_OFFSET		42500
  
  /* CUSTOM VALUES FOR LPS001WP SENSOR */
  #define ST_PRESS_LPS001WP_WAI_EXP		0xba
  #define ST_PRESS_LPS001WP_ODR_ADDR		0x20
  #define ST_PRESS_LPS001WP_ODR_MASK		0x30
  #define ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL	0x01
  #define ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL	0x02
  #define ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL	0x03
  #define ST_PRESS_LPS001WP_PW_ADDR		0x20
  #define ST_PRESS_LPS001WP_PW_MASK		0x40
  #define ST_PRESS_LPS001WP_BDU_ADDR		0x20
  #define ST_PRESS_LPS001WP_BDU_MASK		0x04
  #define ST_PRESS_LPS001WP_MULTIREAD_BIT		true
  #define ST_PRESS_LPS001WP_OUT_L_ADDR		0x28
  #define ST_TEMP_LPS001WP_OUT_L_ADDR		0x2a
  
  /* CUSTOM VALUES FOR LPS25H SENSOR */
  #define ST_PRESS_LPS25H_WAI_EXP			0xbd
  #define ST_PRESS_LPS25H_ODR_ADDR		0x20
  #define ST_PRESS_LPS25H_ODR_MASK		0x70
  #define ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL		0x01
  #define ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL		0x02
  #define ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL	0x03
  #define ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL	0x04
  #define ST_PRESS_LPS25H_PW_ADDR			0x20
  #define ST_PRESS_LPS25H_PW_MASK			0x80
  #define ST_PRESS_LPS25H_FS_ADDR			0x00
  #define ST_PRESS_LPS25H_FS_MASK			0x00
  #define ST_PRESS_LPS25H_FS_AVL_1260_VAL		0x00
  #define ST_PRESS_LPS25H_FS_AVL_1260_GAIN	ST_PRESS_KPASCAL_NANO_SCALE
  #define ST_PRESS_LPS25H_FS_AVL_TEMP_GAIN	ST_PRESS_CELSIUS_NANO_SCALE
  #define ST_PRESS_LPS25H_BDU_ADDR		0x20
  #define ST_PRESS_LPS25H_BDU_MASK		0x04
  #define ST_PRESS_LPS25H_DRDY_IRQ_ADDR		0x23
  #define ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK	0x01
  #define ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK	0x10
  #define ST_PRESS_LPS25H_MULTIREAD_BIT		true
  #define ST_PRESS_LPS25H_TEMP_OFFSET		42500
  #define ST_PRESS_LPS25H_OUT_XL_ADDR		0x28
  #define ST_TEMP_LPS25H_OUT_L_ADDR		0x2b
  
  static const struct iio_chan_spec st_press_1_channels[] = {
  	{
  		.type = IIO_PRESSURE,
  		.channel2 = IIO_NO_MOD,
  		.address = ST_PRESS_1_OUT_XL_ADDR,
  		.scan_index = ST_SENSORS_SCAN_X,
  		.scan_type = {
  			.sign = 'u',
  			.realbits = 24,
  			.storagebits = 24,
  			.endianness = IIO_LE,
  		},
  		.info_mask_separate =
  			BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
  		.modified = 0,
  	},
  	{
  		.type = IIO_TEMP,
  		.channel2 = IIO_NO_MOD,
  		.address = ST_TEMP_1_OUT_L_ADDR,
  		.scan_index = -1,
  		.scan_type = {
  			.sign = 'u',
  			.realbits = 16,
  			.storagebits = 16,
  			.endianness = IIO_LE,
  		},
  		.info_mask_separate =
  			BIT(IIO_CHAN_INFO_RAW) |
  			BIT(IIO_CHAN_INFO_SCALE) |
  			BIT(IIO_CHAN_INFO_OFFSET),
  		.modified = 0,
  	},
  	IIO_CHAN_SOFT_TIMESTAMP(1)
  };
  
  static const struct iio_chan_spec st_press_lps001wp_channels[] = {
  	{
  		.type = IIO_PRESSURE,
  		.channel2 = IIO_NO_MOD,
  		.address = ST_PRESS_LPS001WP_OUT_L_ADDR,
  		.scan_index = ST_SENSORS_SCAN_X,
  		.scan_type = {
  			.sign = 'u',
  			.realbits = 16,
  			.storagebits = 16,
  			.endianness = IIO_LE,
  		},
  		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  		.modified = 0,
  	},
  	{
  		.type = IIO_TEMP,
  		.channel2 = IIO_NO_MOD,
  		.address = ST_TEMP_LPS001WP_OUT_L_ADDR,
  		.scan_index = -1,
  		.scan_type = {
  			.sign = 'u',
  			.realbits = 16,
  			.storagebits = 16,
  			.endianness = IIO_LE,
  		},
  		.info_mask_separate =
  			BIT(IIO_CHAN_INFO_RAW) |
  			BIT(IIO_CHAN_INFO_OFFSET),
  		.modified = 0,
  	},
  	IIO_CHAN_SOFT_TIMESTAMP(1)
  };
  
  static const struct st_sensors st_press_sensors[] = {
  	{
  		.wai = ST_PRESS_LPS331AP_WAI_EXP,
  		.sensors_supported = {
  			[0] = LPS331AP_PRESS_DEV_NAME,
  		},
  		.ch = (struct iio_chan_spec *)st_press_1_channels,
  		.num_ch = ARRAY_SIZE(st_press_1_channels),
  		.odr = {
  			.addr = ST_PRESS_LPS331AP_ODR_ADDR,
  			.mask = ST_PRESS_LPS331AP_ODR_MASK,
  			.odr_avl = {
  				{ 1, ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL, },
  				{ 7, ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL, },
  				{ 13, ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL, },
  				{ 25, ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL, },
  			},
  		},
  		.pw = {
  			.addr = ST_PRESS_LPS331AP_PW_ADDR,
  			.mask = ST_PRESS_LPS331AP_PW_MASK,
  			.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
  			.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
  		},
  		.fs = {
  			.addr = ST_PRESS_LPS331AP_FS_ADDR,
  			.mask = ST_PRESS_LPS331AP_FS_MASK,
  			.fs_avl = {
  				[0] = {
  					.num = ST_PRESS_FS_AVL_1260MB,
  					.value = ST_PRESS_LPS331AP_FS_AVL_1260_VAL,
  					.gain = ST_PRESS_LPS331AP_FS_AVL_1260_GAIN,
  					.gain2 = ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN,
  				},
  			},
  		},
  		.bdu = {
  			.addr = ST_PRESS_LPS331AP_BDU_ADDR,
  			.mask = ST_PRESS_LPS331AP_BDU_MASK,
  		},
  		.drdy_irq = {
  			.addr = ST_PRESS_LPS331AP_DRDY_IRQ_ADDR,
  			.mask_int1 = ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK,
  			.mask_int2 = ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK,
  		},
  		.multi_read_bit = ST_PRESS_LPS331AP_MULTIREAD_BIT,
  		.bootime = 2,
  	},
  	{
  		.wai = ST_PRESS_LPS001WP_WAI_EXP,
  		.sensors_supported = {
  			[0] = LPS001WP_PRESS_DEV_NAME,
  		},
  		.ch = (struct iio_chan_spec *)st_press_lps001wp_channels,
  		.num_ch = ARRAY_SIZE(st_press_lps001wp_channels),
  		.odr = {
  			.addr = ST_PRESS_LPS001WP_ODR_ADDR,
  			.mask = ST_PRESS_LPS001WP_ODR_MASK,
  			.odr_avl = {
  				{ 1, ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL, },
  				{ 7, ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL, },
  				{ 13, ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL, },
  			},
  		},
  		.pw = {
  			.addr = ST_PRESS_LPS001WP_PW_ADDR,
  			.mask = ST_PRESS_LPS001WP_PW_MASK,
  			.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
  			.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
  		},
  		.fs = {
  			.addr = 0,
  		},
  		.bdu = {
  			.addr = ST_PRESS_LPS001WP_BDU_ADDR,
  			.mask = ST_PRESS_LPS001WP_BDU_MASK,
  		},
  		.drdy_irq = {
  			.addr = 0,
  		},
  		.multi_read_bit = ST_PRESS_LPS001WP_MULTIREAD_BIT,
  		.bootime = 2,
  	},
  	{
  		.wai = ST_PRESS_LPS25H_WAI_EXP,
  		.sensors_supported = {
  			[0] = LPS25H_PRESS_DEV_NAME,
  		},
  		.ch = (struct iio_chan_spec *)st_press_1_channels,
  		.num_ch = ARRAY_SIZE(st_press_1_channels),
  		.odr = {
  			.addr = ST_PRESS_LPS25H_ODR_ADDR,
  			.mask = ST_PRESS_LPS25H_ODR_MASK,
  			.odr_avl = {
  				{ 1, ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL, },
  				{ 7, ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL, },
  				{ 13, ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL, },
  				{ 25, ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL, },
  			},
  		},
  		.pw = {
  			.addr = ST_PRESS_LPS25H_PW_ADDR,
  			.mask = ST_PRESS_LPS25H_PW_MASK,
  			.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
  			.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
  		},
  		.fs = {
  			.addr = ST_PRESS_LPS25H_FS_ADDR,
  			.mask = ST_PRESS_LPS25H_FS_MASK,
  			.fs_avl = {
  				[0] = {
  					.num = ST_PRESS_FS_AVL_1260MB,
  					.value = ST_PRESS_LPS25H_FS_AVL_1260_VAL,
  					.gain = ST_PRESS_LPS25H_FS_AVL_1260_GAIN,
  					.gain2 = ST_PRESS_LPS25H_FS_AVL_TEMP_GAIN,
  				},
  			},
  		},
  		.bdu = {
  			.addr = ST_PRESS_LPS25H_BDU_ADDR,
  			.mask = ST_PRESS_LPS25H_BDU_MASK,
  		},
  		.drdy_irq = {
  			.addr = ST_PRESS_LPS25H_DRDY_IRQ_ADDR,
  			.mask_int1 = ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK,
  			.mask_int2 = ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK,
  		},
  		.multi_read_bit = ST_PRESS_LPS25H_MULTIREAD_BIT,
  		.bootime = 2,
  	},
  };
  
  static int st_press_read_raw(struct iio_dev *indio_dev,
  			struct iio_chan_spec const *ch, int *val,
  							int *val2, long mask)
  {
  	int err;
  	struct st_sensor_data *pdata = iio_priv(indio_dev);
  
  	switch (mask) {
  	case IIO_CHAN_INFO_RAW:
  		err = st_sensors_read_info_raw(indio_dev, ch, val);
  		if (err < 0)
  			goto read_error;
  
  		return IIO_VAL_INT;
  	case IIO_CHAN_INFO_SCALE:
  		*val = 0;
  
  		switch (ch->type) {
  		case IIO_PRESSURE:
  			*val2 = pdata->current_fullscale->gain;
  			break;
  		case IIO_TEMP:
  			*val2 = pdata->current_fullscale->gain2;
  			break;
  		default:
  			err = -EINVAL;
  			goto read_error;
  		}
  
  		return IIO_VAL_INT_PLUS_NANO;
  	case IIO_CHAN_INFO_OFFSET:
  		switch (ch->type) {
  		case IIO_TEMP:
  			*val = 425;
  			*val2 = 10;
  			break;
  		default:
  			err = -EINVAL;
  			goto read_error;
  		}
  
  		return IIO_VAL_FRACTIONAL;
  	default:
  		return -EINVAL;
  	}
  
  read_error:
  	return err;
  }
  
  static ST_SENSOR_DEV_ATTR_SAMP_FREQ();
  static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
  
  static struct attribute *st_press_attributes[] = {
  	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
  	&iio_dev_attr_sampling_frequency.dev_attr.attr,
  	NULL,
  };
  
  static const struct attribute_group st_press_attribute_group = {
  	.attrs = st_press_attributes,
  };
  
  static const struct iio_info press_info = {
  	.driver_module = THIS_MODULE,
  	.attrs = &st_press_attribute_group,
  	.read_raw = &st_press_read_raw,
  };
  
  #ifdef CONFIG_IIO_TRIGGER
  static const struct iio_trigger_ops st_press_trigger_ops = {
  	.owner = THIS_MODULE,
  	.set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
  };
  #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
  #else
  #define ST_PRESS_TRIGGER_OPS NULL
  #endif
  
  int st_press_common_probe(struct iio_dev *indio_dev,
  				struct st_sensors_platform_data *plat_data)
  {
  	struct st_sensor_data *pdata = iio_priv(indio_dev);
  	int irq = pdata->get_irq_data_ready(indio_dev);
  	int err;
  
  	indio_dev->modes = INDIO_DIRECT_MODE;
  	indio_dev->info = &press_info;
  
  	st_sensors_power_enable(indio_dev);
  
  	err = st_sensors_check_device_support(indio_dev,
  					      ARRAY_SIZE(st_press_sensors),
  					      st_press_sensors);
  	if (err < 0)
  		return err;
  
  	pdata->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS;
  	pdata->multiread_bit     = pdata->sensor->multi_read_bit;
  	indio_dev->channels      = pdata->sensor->ch;
  	indio_dev->num_channels  = pdata->sensor->num_ch;
  
  	if (pdata->sensor->fs.addr != 0)
  		pdata->current_fullscale = (struct st_sensor_fullscale_avl *)
  			&pdata->sensor->fs.fs_avl[0];
  
  	pdata->odr = pdata->sensor->odr.odr_avl[0].hz;
  
  	/* Some devices don't support a data ready pin. */
  	if (!plat_data && pdata->sensor->drdy_irq.addr)
  		plat_data =
  			(struct st_sensors_platform_data *)&default_press_pdata;
  
  	err = st_sensors_init_sensor(indio_dev, plat_data);
  	if (err < 0)
  		return err;
  
  	err = st_press_allocate_ring(indio_dev);
  	if (err < 0)
  		return err;
  
  	if (irq > 0) {
  		err = st_sensors_allocate_trigger(indio_dev,
  						  ST_PRESS_TRIGGER_OPS);
  		if (err < 0)
  			goto st_press_probe_trigger_error;
  	}
  
  	err = iio_device_register(indio_dev);
  	if (err)
  		goto st_press_device_register_error;
  
  	dev_info(&indio_dev->dev, "registered pressure sensor %s\n",
  		 indio_dev->name);
  
  	return err;
  
  st_press_device_register_error:
  	if (irq > 0)
  		st_sensors_deallocate_trigger(indio_dev);
  st_press_probe_trigger_error:
  	st_press_deallocate_ring(indio_dev);
  
  	return err;
  }
  EXPORT_SYMBOL(st_press_common_probe);
  
  void st_press_common_remove(struct iio_dev *indio_dev)
  {
  	struct st_sensor_data *pdata = iio_priv(indio_dev);
  
  	st_sensors_power_disable(indio_dev);
  
  	iio_device_unregister(indio_dev);
  	if (pdata->get_irq_data_ready(indio_dev) > 0)
  		st_sensors_deallocate_trigger(indio_dev);
  
  	st_press_deallocate_ring(indio_dev);
  }
  EXPORT_SYMBOL(st_press_common_remove);
  
  MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
  MODULE_DESCRIPTION("STMicroelectronics pressures driver");
  MODULE_LICENSE("GPL v2");
  