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472 lines
12 KiB
C
472 lines
12 KiB
C
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/**
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* Sensortek STK3310/STK3311 Ambient Light and Proximity Sensor
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*
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* Copyright (c) 2015, Intel Corporation.
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* IIO driver for STK3310/STK3311. 7-bit I2C address: 0x48.
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*/
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#include <linux/acpi.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define STK3310_REG_STATE 0x00
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#define STK3310_REG_PSCTRL 0x01
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#define STK3310_REG_ALSCTRL 0x02
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#define STK3310_REG_PS_DATA_MSB 0x11
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#define STK3310_REG_PS_DATA_LSB 0x12
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#define STK3310_REG_ALS_DATA_MSB 0x13
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#define STK3310_REG_ALS_DATA_LSB 0x14
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#define STK3310_REG_ID 0x3E
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#define STK3310_MAX_REG 0x80
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#define STK3310_STATE_EN_PS 0x01
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#define STK3310_STATE_EN_ALS 0x02
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#define STK3310_STATE_STANDBY 0x00
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#define STK3310_CHIP_ID_VAL 0x13
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#define STK3311_CHIP_ID_VAL 0x1D
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#define STK3310_PS_MAX_VAL 0xFFFF
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#define STK3310_DRIVER_NAME "stk3310"
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#define STK3310_REGMAP_NAME "stk3310_regmap"
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#define STK3310_SCALE_AVAILABLE "6.4 1.6 0.4 0.1"
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#define STK3310_IT_AVAILABLE \
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"0.000185 0.000370 0.000741 0.001480 0.002960 0.005920 0.011840 " \
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"0.023680 0.047360 0.094720 0.189440 0.378880 0.757760 1.515520 " \
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"3.031040 6.062080"
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#define STK3310_REGFIELD(name) \
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do { \
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data->reg_##name = \
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devm_regmap_field_alloc(&client->dev, regmap, \
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stk3310_reg_field_##name); \
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if (IS_ERR(data->reg_##name)) { \
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dev_err(&client->dev, "reg field alloc failed.\n"); \
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return PTR_ERR(data->reg_##name); \
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} \
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} while (0)
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static const struct reg_field stk3310_reg_field_state =
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REG_FIELD(STK3310_REG_STATE, 0, 2);
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static const struct reg_field stk3310_reg_field_als_gain =
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REG_FIELD(STK3310_REG_ALSCTRL, 4, 5);
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static const struct reg_field stk3310_reg_field_ps_gain =
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REG_FIELD(STK3310_REG_PSCTRL, 4, 5);
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static const struct reg_field stk3310_reg_field_als_it =
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REG_FIELD(STK3310_REG_ALSCTRL, 0, 3);
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static const struct reg_field stk3310_reg_field_ps_it =
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REG_FIELD(STK3310_REG_PSCTRL, 0, 3);
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/*
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* Maximum PS values with regard to scale. Used to export the 'inverse'
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* PS value (high values for far objects, low values for near objects).
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*/
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static const int stk3310_ps_max[4] = {
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STK3310_PS_MAX_VAL / 64,
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STK3310_PS_MAX_VAL / 16,
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STK3310_PS_MAX_VAL / 4,
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STK3310_PS_MAX_VAL,
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};
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static const int stk3310_scale_table[][2] = {
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{6, 400000}, {1, 600000}, {0, 400000}, {0, 100000}
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};
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/* Integration time in seconds, microseconds */
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static const int stk3310_it_table[][2] = {
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{0, 185}, {0, 370}, {0, 741}, {0, 1480},
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{0, 2960}, {0, 5920}, {0, 11840}, {0, 23680},
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{0, 47360}, {0, 94720}, {0, 189440}, {0, 378880},
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{0, 757760}, {1, 515520}, {3, 31040}, {6, 62080},
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};
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struct stk3310_data {
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struct i2c_client *client;
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struct mutex lock;
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bool als_enabled;
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bool ps_enabled;
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struct regmap *regmap;
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struct regmap_field *reg_state;
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struct regmap_field *reg_als_gain;
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struct regmap_field *reg_ps_gain;
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struct regmap_field *reg_als_it;
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struct regmap_field *reg_ps_it;
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};
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static const struct iio_chan_spec stk3310_channels[] = {
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{
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.type = IIO_LIGHT,
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.info_mask_separate =
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BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_INT_TIME),
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},
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{
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.type = IIO_PROXIMITY,
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.info_mask_separate =
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BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_INT_TIME),
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}
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};
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static IIO_CONST_ATTR(in_illuminance_scale_available, STK3310_SCALE_AVAILABLE);
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static IIO_CONST_ATTR(in_proximity_scale_available, STK3310_SCALE_AVAILABLE);
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static IIO_CONST_ATTR(in_illuminance_integration_time_available,
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STK3310_IT_AVAILABLE);
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static IIO_CONST_ATTR(in_proximity_integration_time_available,
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STK3310_IT_AVAILABLE);
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static struct attribute *stk3310_attributes[] = {
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&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
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&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
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&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
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&iio_const_attr_in_proximity_integration_time_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group stk3310_attribute_group = {
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.attrs = stk3310_attributes
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};
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static int stk3310_get_index(const int table[][2], int table_size,
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int val, int val2)
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{
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int i;
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for (i = 0; i < table_size; i++) {
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if (val == table[i][0] && val2 == table[i][1])
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return i;
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}
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return -EINVAL;
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}
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static int stk3310_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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u8 reg;
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u16 buf;
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int ret;
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unsigned int index;
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struct stk3310_data *data = iio_priv(indio_dev);
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struct i2c_client *client = data->client;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (chan->type == IIO_LIGHT)
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reg = STK3310_REG_ALS_DATA_MSB;
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else if (chan->type == IIO_PROXIMITY)
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reg = STK3310_REG_PS_DATA_MSB;
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else
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return -EINVAL;
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mutex_lock(&data->lock);
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ret = regmap_bulk_read(data->regmap, reg, &buf, 2);
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if (ret < 0) {
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dev_err(&client->dev, "register read failed\n");
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mutex_unlock(&data->lock);
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return ret;
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}
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*val = swab16(buf);
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if (chan->type == IIO_PROXIMITY) {
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/*
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* Invert the proximity data so we return low values
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* for close objects and high values for far ones.
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*/
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regmap_field_read(data->reg_ps_gain, &index);
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*val = stk3310_ps_max[index] - *val;
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}
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mutex_unlock(&data->lock);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_INT_TIME:
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if (chan->type == IIO_LIGHT)
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regmap_field_read(data->reg_als_it, &index);
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else
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regmap_field_read(data->reg_ps_it, &index);
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*val = stk3310_it_table[index][0];
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*val2 = stk3310_it_table[index][1];
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_SCALE:
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if (chan->type == IIO_LIGHT)
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regmap_field_read(data->reg_als_gain, &index);
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else
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regmap_field_read(data->reg_ps_gain, &index);
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*val = stk3310_scale_table[index][0];
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*val2 = stk3310_scale_table[index][1];
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return IIO_VAL_INT_PLUS_MICRO;
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}
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return -EINVAL;
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}
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static int stk3310_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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int ret;
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unsigned int index;
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struct stk3310_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_INT_TIME:
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index = stk3310_get_index(stk3310_it_table,
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ARRAY_SIZE(stk3310_it_table),
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val, val2);
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if (index < 0)
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return -EINVAL;
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mutex_lock(&data->lock);
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if (chan->type == IIO_LIGHT)
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ret = regmap_field_write(data->reg_als_it, index);
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else
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ret = regmap_field_write(data->reg_ps_it, index);
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if (ret < 0)
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dev_err(&data->client->dev,
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"sensor configuration failed\n");
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mutex_unlock(&data->lock);
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return ret;
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case IIO_CHAN_INFO_SCALE:
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index = stk3310_get_index(stk3310_scale_table,
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ARRAY_SIZE(stk3310_scale_table),
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val, val2);
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if (index < 0)
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return -EINVAL;
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mutex_lock(&data->lock);
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if (chan->type == IIO_LIGHT)
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ret = regmap_field_write(data->reg_als_gain, index);
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else
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ret = regmap_field_write(data->reg_ps_gain, index);
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if (ret < 0)
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dev_err(&data->client->dev,
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"sensor configuration failed\n");
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mutex_unlock(&data->lock);
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return ret;
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}
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return -EINVAL;
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}
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static const struct iio_info stk3310_info = {
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.driver_module = THIS_MODULE,
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.read_raw = stk3310_read_raw,
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.write_raw = stk3310_write_raw,
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.attrs = &stk3310_attribute_group,
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};
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static int stk3310_set_state(struct stk3310_data *data, u8 state)
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{
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int ret;
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struct i2c_client *client = data->client;
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/* 3-bit state; 0b100 is not supported. */
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if (state > 7 || state == 4)
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return -EINVAL;
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mutex_lock(&data->lock);
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ret = regmap_field_write(data->reg_state, state);
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if (ret < 0) {
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dev_err(&client->dev, "failed to change sensor state\n");
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} else if (state != STK3310_STATE_STANDBY) {
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/* Don't reset the 'enabled' flags if we're going in standby */
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data->ps_enabled = !!(state & 0x01);
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data->als_enabled = !!(state & 0x02);
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}
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mutex_unlock(&data->lock);
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return ret;
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}
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static int stk3310_init(struct iio_dev *indio_dev)
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{
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int ret;
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int chipid;
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u8 state;
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struct stk3310_data *data = iio_priv(indio_dev);
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struct i2c_client *client = data->client;
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regmap_read(data->regmap, STK3310_REG_ID, &chipid);
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if (chipid != STK3310_CHIP_ID_VAL &&
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chipid != STK3311_CHIP_ID_VAL) {
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dev_err(&client->dev, "invalid chip id: 0x%x\n", chipid);
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return -ENODEV;
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}
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state = STK3310_STATE_EN_ALS | STK3310_STATE_EN_PS;
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ret = stk3310_set_state(data, state);
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if (ret < 0)
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dev_err(&client->dev, "failed to enable sensor");
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return ret;
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}
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static bool stk3310_is_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case STK3310_REG_ALS_DATA_MSB:
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case STK3310_REG_ALS_DATA_LSB:
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case STK3310_REG_PS_DATA_LSB:
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case STK3310_REG_PS_DATA_MSB:
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return true;
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default:
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return false;
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}
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}
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static struct regmap_config stk3310_regmap_config = {
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.name = STK3310_REGMAP_NAME,
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = STK3310_MAX_REG,
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.cache_type = REGCACHE_RBTREE,
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.volatile_reg = stk3310_is_volatile_reg,
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};
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static int stk3310_regmap_init(struct stk3310_data *data)
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{
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struct regmap *regmap;
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struct i2c_client *client;
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client = data->client;
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regmap = devm_regmap_init_i2c(client, &stk3310_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(&client->dev, "regmap initialization failed.\n");
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return PTR_ERR(regmap);
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}
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data->regmap = regmap;
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STK3310_REGFIELD(state);
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STK3310_REGFIELD(als_gain);
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STK3310_REGFIELD(ps_gain);
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STK3310_REGFIELD(als_it);
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STK3310_REGFIELD(ps_it);
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return 0;
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}
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static int stk3310_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int ret;
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struct iio_dev *indio_dev;
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struct stk3310_data *data;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev) {
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dev_err(&client->dev, "iio allocation failed!\n");
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return -ENOMEM;
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}
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data = iio_priv(indio_dev);
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data->client = client;
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i2c_set_clientdata(client, indio_dev);
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mutex_init(&data->lock);
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ret = stk3310_regmap_init(data);
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if (ret < 0)
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return ret;
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &stk3310_info;
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indio_dev->name = STK3310_DRIVER_NAME;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = stk3310_channels;
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indio_dev->num_channels = ARRAY_SIZE(stk3310_channels);
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ret = stk3310_init(indio_dev);
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if (ret < 0)
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return ret;
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ret = iio_device_register(indio_dev);
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if (ret < 0) {
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dev_err(&client->dev, "device_register failed\n");
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stk3310_set_state(data, STK3310_STATE_STANDBY);
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}
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int stk3310_remove(struct i2c_client *client)
|
||
|
{
|
||
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
||
|
|
||
|
iio_device_unregister(indio_dev);
|
||
|
return stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
|
||
|
}
|
||
|
|
||
|
#ifdef CONFIG_PM_SLEEP
|
||
|
static int stk3310_suspend(struct device *dev)
|
||
|
{
|
||
|
struct stk3310_data *data;
|
||
|
|
||
|
data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
|
||
|
|
||
|
return stk3310_set_state(data, STK3310_STATE_STANDBY);
|
||
|
}
|
||
|
|
||
|
static int stk3310_resume(struct device *dev)
|
||
|
{
|
||
|
int state = 0;
|
||
|
struct stk3310_data *data;
|
||
|
|
||
|
data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
|
||
|
if (data->ps_enabled)
|
||
|
state |= STK3310_STATE_EN_PS;
|
||
|
if (data->als_enabled)
|
||
|
state |= STK3310_STATE_EN_ALS;
|
||
|
|
||
|
return stk3310_set_state(data, state);
|
||
|
}
|
||
|
|
||
|
static SIMPLE_DEV_PM_OPS(stk3310_pm_ops, stk3310_suspend, stk3310_resume);
|
||
|
|
||
|
#define STK3310_PM_OPS (&stk3310_pm_ops)
|
||
|
#else
|
||
|
#define STK3310_PM_OPS NULL
|
||
|
#endif
|
||
|
|
||
|
static const struct i2c_device_id stk3310_i2c_id[] = {
|
||
|
{"STK3310", 0},
|
||
|
{"STK3311", 0},
|
||
|
{}
|
||
|
};
|
||
|
|
||
|
static const struct acpi_device_id stk3310_acpi_id[] = {
|
||
|
{"STK3310", 0},
|
||
|
{"STK3311", 0},
|
||
|
{}
|
||
|
};
|
||
|
|
||
|
MODULE_DEVICE_TABLE(acpi, stk3310_acpi_id);
|
||
|
|
||
|
static struct i2c_driver stk3310_driver = {
|
||
|
.driver = {
|
||
|
.name = "stk3310",
|
||
|
.pm = STK3310_PM_OPS,
|
||
|
.acpi_match_table = ACPI_PTR(stk3310_acpi_id),
|
||
|
},
|
||
|
.probe = stk3310_probe,
|
||
|
.remove = stk3310_remove,
|
||
|
.id_table = stk3310_i2c_id,
|
||
|
};
|
||
|
|
||
|
module_i2c_driver(stk3310_driver);
|
||
|
|
||
|
MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
|
||
|
MODULE_DESCRIPTION("STK3310 Ambient Light and Proximity Sensor driver");
|
||
|
MODULE_LICENSE("GPL v2");
|