![Jonathan Cameron](/assets/img/avatar_default.png)
The equivalent of both of these are now done via macro magic when the relevant register calls are made. The actual structure elements will shortly go away. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
729 lines
17 KiB
C
729 lines
17 KiB
C
/*
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* IIO driver for the light sensor ISL29028.
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* ISL29028 is Concurrent Ambient Light and Proximity Sensor
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*
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
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* Copyright (c) 2016-2017 Brian Masney <masneyb@onstation.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Datasheets:
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* - http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29028.pdf
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* - http://www.intersil.com/content/dam/Intersil/documents/isl2/isl29030.pdf
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#include <linux/slab.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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#include <linux/pm_runtime.h>
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#define ISL29028_CONV_TIME_MS 100
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#define ISL29028_REG_CONFIGURE 0x01
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#define ISL29028_CONF_ALS_IR_MODE_ALS 0
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#define ISL29028_CONF_ALS_IR_MODE_IR BIT(0)
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#define ISL29028_CONF_ALS_IR_MODE_MASK BIT(0)
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#define ISL29028_CONF_ALS_RANGE_LOW_LUX 0
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#define ISL29028_CONF_ALS_RANGE_HIGH_LUX BIT(1)
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#define ISL29028_CONF_ALS_RANGE_MASK BIT(1)
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#define ISL29028_CONF_ALS_DIS 0
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#define ISL29028_CONF_ALS_EN BIT(2)
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#define ISL29028_CONF_ALS_EN_MASK BIT(2)
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#define ISL29028_CONF_PROX_SLP_SH 4
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#define ISL29028_CONF_PROX_SLP_MASK (7 << ISL29028_CONF_PROX_SLP_SH)
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#define ISL29028_CONF_PROX_EN BIT(7)
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#define ISL29028_CONF_PROX_EN_MASK BIT(7)
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#define ISL29028_REG_INTERRUPT 0x02
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#define ISL29028_REG_PROX_DATA 0x08
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#define ISL29028_REG_ALSIR_L 0x09
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#define ISL29028_REG_ALSIR_U 0x0A
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#define ISL29028_REG_TEST1_MODE 0x0E
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#define ISL29028_REG_TEST2_MODE 0x0F
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#define ISL29028_NUM_REGS (ISL29028_REG_TEST2_MODE + 1)
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#define ISL29028_POWER_OFF_DELAY_MS 2000
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struct isl29028_prox_data {
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int sampling_int;
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int sampling_fract;
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int sleep_time;
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};
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static const struct isl29028_prox_data isl29028_prox_data[] = {
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{ 1, 250000, 800 },
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{ 2, 500000, 400 },
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{ 5, 0, 200 },
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{ 10, 0, 100 },
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{ 13, 300000, 75 },
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{ 20, 0, 50 },
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{ 80, 0, 13 }, /*
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* Note: Data sheet lists 12.5 ms sleep time.
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* Round up a half millisecond for msleep().
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*/
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{ 100, 0, 0 }
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};
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enum isl29028_als_ir_mode {
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ISL29028_MODE_NONE = 0,
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ISL29028_MODE_ALS,
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ISL29028_MODE_IR,
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};
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struct isl29028_chip {
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struct mutex lock;
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struct regmap *regmap;
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int prox_sampling_int;
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int prox_sampling_frac;
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bool enable_prox;
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int lux_scale;
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enum isl29028_als_ir_mode als_ir_mode;
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};
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static int isl29028_find_prox_sleep_index(int sampling_int, int sampling_fract)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(isl29028_prox_data); ++i) {
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if (isl29028_prox_data[i].sampling_int == sampling_int &&
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isl29028_prox_data[i].sampling_fract == sampling_fract)
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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 isl29028_set_proxim_sampling(struct isl29028_chip *chip,
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int sampling_int, int sampling_fract)
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{
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struct device *dev = regmap_get_device(chip->regmap);
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int sleep_index, ret;
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sleep_index = isl29028_find_prox_sleep_index(sampling_int,
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sampling_fract);
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if (sleep_index < 0)
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return sleep_index;
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ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
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ISL29028_CONF_PROX_SLP_MASK,
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sleep_index << ISL29028_CONF_PROX_SLP_SH);
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if (ret < 0) {
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dev_err(dev, "%s(): Error %d setting the proximity sampling\n",
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__func__, ret);
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return ret;
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}
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chip->prox_sampling_int = sampling_int;
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chip->prox_sampling_frac = sampling_fract;
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return ret;
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}
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static int isl29028_enable_proximity(struct isl29028_chip *chip)
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{
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int prox_index, ret;
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ret = isl29028_set_proxim_sampling(chip, chip->prox_sampling_int,
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chip->prox_sampling_frac);
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if (ret < 0)
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return ret;
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ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
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ISL29028_CONF_PROX_EN_MASK,
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ISL29028_CONF_PROX_EN);
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if (ret < 0)
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return ret;
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/* Wait for conversion to be complete for first sample */
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prox_index = isl29028_find_prox_sleep_index(chip->prox_sampling_int,
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chip->prox_sampling_frac);
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if (prox_index < 0)
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return prox_index;
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msleep(isl29028_prox_data[prox_index].sleep_time);
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return 0;
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}
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static int isl29028_set_als_scale(struct isl29028_chip *chip, int lux_scale)
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{
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struct device *dev = regmap_get_device(chip->regmap);
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int val = (lux_scale == 2000) ? ISL29028_CONF_ALS_RANGE_HIGH_LUX :
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ISL29028_CONF_ALS_RANGE_LOW_LUX;
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int ret;
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ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
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ISL29028_CONF_ALS_RANGE_MASK, val);
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if (ret < 0) {
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dev_err(dev, "%s(): Error %d setting the ALS scale\n", __func__,
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ret);
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return ret;
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}
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chip->lux_scale = lux_scale;
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return ret;
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}
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static int isl29028_set_als_ir_mode(struct isl29028_chip *chip,
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enum isl29028_als_ir_mode mode)
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{
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int ret;
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if (chip->als_ir_mode == mode)
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return 0;
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ret = isl29028_set_als_scale(chip, chip->lux_scale);
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if (ret < 0)
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return ret;
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switch (mode) {
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case ISL29028_MODE_ALS:
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ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
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ISL29028_CONF_ALS_IR_MODE_MASK,
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ISL29028_CONF_ALS_IR_MODE_ALS);
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if (ret < 0)
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return ret;
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ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
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ISL29028_CONF_ALS_RANGE_MASK,
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ISL29028_CONF_ALS_RANGE_HIGH_LUX);
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break;
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case ISL29028_MODE_IR:
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ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
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ISL29028_CONF_ALS_IR_MODE_MASK,
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ISL29028_CONF_ALS_IR_MODE_IR);
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break;
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case ISL29028_MODE_NONE:
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return regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
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ISL29028_CONF_ALS_EN_MASK,
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ISL29028_CONF_ALS_DIS);
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}
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if (ret < 0)
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return ret;
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/* Enable the ALS/IR */
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ret = regmap_update_bits(chip->regmap, ISL29028_REG_CONFIGURE,
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ISL29028_CONF_ALS_EN_MASK,
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ISL29028_CONF_ALS_EN);
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if (ret < 0)
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return ret;
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/* Need to wait for conversion time if ALS/IR mode enabled */
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msleep(ISL29028_CONV_TIME_MS);
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chip->als_ir_mode = mode;
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return 0;
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}
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static int isl29028_read_als_ir(struct isl29028_chip *chip, int *als_ir)
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{
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struct device *dev = regmap_get_device(chip->regmap);
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unsigned int lsb;
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unsigned int msb;
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int ret;
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ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_L, &lsb);
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if (ret < 0) {
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dev_err(dev,
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"%s(): Error %d reading register ALSIR_L\n",
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__func__, ret);
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return ret;
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}
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ret = regmap_read(chip->regmap, ISL29028_REG_ALSIR_U, &msb);
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if (ret < 0) {
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dev_err(dev,
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"%s(): Error %d reading register ALSIR_U\n",
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__func__, ret);
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return ret;
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}
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*als_ir = ((msb & 0xF) << 8) | (lsb & 0xFF);
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return 0;
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}
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static int isl29028_read_proxim(struct isl29028_chip *chip, int *prox)
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{
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struct device *dev = regmap_get_device(chip->regmap);
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unsigned int data;
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int ret;
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if (!chip->enable_prox) {
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ret = isl29028_enable_proximity(chip);
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if (ret < 0)
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return ret;
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chip->enable_prox = true;
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}
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ret = regmap_read(chip->regmap, ISL29028_REG_PROX_DATA, &data);
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if (ret < 0) {
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dev_err(dev, "%s(): Error %d reading register PROX_DATA\n",
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__func__, ret);
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return ret;
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}
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*prox = data;
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return 0;
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}
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static int isl29028_als_get(struct isl29028_chip *chip, int *als_data)
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{
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struct device *dev = regmap_get_device(chip->regmap);
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int ret;
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int als_ir_data;
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ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_ALS);
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if (ret < 0) {
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dev_err(dev, "%s(): Error %d enabling ALS mode\n", __func__,
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ret);
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return ret;
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}
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ret = isl29028_read_als_ir(chip, &als_ir_data);
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if (ret < 0)
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return ret;
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/*
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* convert als data count to lux.
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* if lux_scale = 125, lux = count * 0.031
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* if lux_scale = 2000, lux = count * 0.49
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*/
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if (chip->lux_scale == 125)
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als_ir_data = (als_ir_data * 31) / 1000;
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else
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als_ir_data = (als_ir_data * 49) / 100;
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*als_data = als_ir_data;
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return 0;
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}
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static int isl29028_ir_get(struct isl29028_chip *chip, int *ir_data)
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{
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struct device *dev = regmap_get_device(chip->regmap);
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int ret;
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ret = isl29028_set_als_ir_mode(chip, ISL29028_MODE_IR);
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if (ret < 0) {
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dev_err(dev, "%s(): Error %d enabling IR mode\n", __func__,
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ret);
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return ret;
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}
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return isl29028_read_als_ir(chip, ir_data);
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}
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static int isl29028_set_pm_runtime_busy(struct isl29028_chip *chip, bool on)
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{
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struct device *dev = regmap_get_device(chip->regmap);
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int ret;
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if (on) {
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ret = pm_runtime_get_sync(dev);
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if (ret < 0)
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pm_runtime_put_noidle(dev);
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} else {
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pm_runtime_mark_last_busy(dev);
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ret = pm_runtime_put_autosuspend(dev);
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}
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return ret;
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}
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/* Channel IO */
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static int isl29028_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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struct isl29028_chip *chip = iio_priv(indio_dev);
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struct device *dev = regmap_get_device(chip->regmap);
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int ret;
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ret = isl29028_set_pm_runtime_busy(chip, true);
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if (ret < 0)
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return ret;
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mutex_lock(&chip->lock);
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ret = -EINVAL;
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switch (chan->type) {
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case IIO_PROXIMITY:
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if (mask != IIO_CHAN_INFO_SAMP_FREQ) {
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dev_err(dev,
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"%s(): proximity: Mask value 0x%08lx is not supported\n",
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__func__, mask);
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break;
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}
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if (val < 1 || val > 100) {
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dev_err(dev,
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"%s(): proximity: Sampling frequency %d is not in the range [1:100]\n",
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__func__, val);
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break;
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}
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ret = isl29028_set_proxim_sampling(chip, val, val2);
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break;
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case IIO_LIGHT:
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if (mask != IIO_CHAN_INFO_SCALE) {
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dev_err(dev,
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"%s(): light: Mask value 0x%08lx is not supported\n",
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__func__, mask);
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break;
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}
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if (val != 125 && val != 2000) {
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dev_err(dev,
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"%s(): light: Lux scale %d is not in the set {125, 2000}\n",
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__func__, val);
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break;
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}
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ret = isl29028_set_als_scale(chip, val);
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break;
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default:
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dev_err(dev, "%s(): Unsupported channel type %x\n",
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__func__, chan->type);
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break;
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}
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mutex_unlock(&chip->lock);
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if (ret < 0)
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return ret;
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ret = isl29028_set_pm_runtime_busy(chip, false);
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if (ret < 0)
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return ret;
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return ret;
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}
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static int isl29028_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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struct isl29028_chip *chip = iio_priv(indio_dev);
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struct device *dev = regmap_get_device(chip->regmap);
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int ret, pm_ret;
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ret = isl29028_set_pm_runtime_busy(chip, true);
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if (ret < 0)
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return ret;
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mutex_lock(&chip->lock);
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ret = -EINVAL;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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case IIO_CHAN_INFO_PROCESSED:
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switch (chan->type) {
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case IIO_LIGHT:
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ret = isl29028_als_get(chip, val);
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break;
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case IIO_INTENSITY:
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ret = isl29028_ir_get(chip, val);
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break;
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case IIO_PROXIMITY:
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ret = isl29028_read_proxim(chip, val);
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break;
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default:
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break;
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}
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if (ret < 0)
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break;
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ret = IIO_VAL_INT;
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break;
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case IIO_CHAN_INFO_SAMP_FREQ:
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if (chan->type != IIO_PROXIMITY)
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break;
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*val = chip->prox_sampling_int;
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*val2 = chip->prox_sampling_frac;
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ret = IIO_VAL_INT;
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break;
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case IIO_CHAN_INFO_SCALE:
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if (chan->type != IIO_LIGHT)
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break;
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*val = chip->lux_scale;
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ret = IIO_VAL_INT;
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break;
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default:
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dev_err(dev, "%s(): mask value 0x%08lx is not supported\n",
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__func__, mask);
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break;
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}
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mutex_unlock(&chip->lock);
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if (ret < 0)
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return ret;
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/**
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* Preserve the ret variable if the call to
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* isl29028_set_pm_runtime_busy() is successful so the reading
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* (if applicable) is returned to user space.
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*/
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pm_ret = isl29028_set_pm_runtime_busy(chip, false);
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if (pm_ret < 0)
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return pm_ret;
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return ret;
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}
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static IIO_CONST_ATTR(in_proximity_sampling_frequency_available,
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"1.25 2.5 5 10 13.3 20 80 100");
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static IIO_CONST_ATTR(in_illuminance_scale_available, "125 2000");
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#define ISL29028_CONST_ATTR(name) (&iio_const_attr_##name.dev_attr.attr)
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static struct attribute *isl29028_attributes[] = {
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ISL29028_CONST_ATTR(in_proximity_sampling_frequency_available),
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ISL29028_CONST_ATTR(in_illuminance_scale_available),
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NULL,
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};
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static const struct attribute_group isl29108_group = {
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.attrs = isl29028_attributes,
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};
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static const struct iio_chan_spec isl29028_channels[] = {
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{
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.type = IIO_LIGHT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
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BIT(IIO_CHAN_INFO_SCALE),
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}, {
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.type = IIO_INTENSITY,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}, {
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.type = IIO_PROXIMITY,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SAMP_FREQ),
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}
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};
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static const struct iio_info isl29028_info = {
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.attrs = &isl29108_group,
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.read_raw = isl29028_read_raw,
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.write_raw = isl29028_write_raw,
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};
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static int isl29028_clear_configure_reg(struct isl29028_chip *chip)
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{
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struct device *dev = regmap_get_device(chip->regmap);
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int ret;
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ret = regmap_write(chip->regmap, ISL29028_REG_CONFIGURE, 0x0);
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if (ret < 0)
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dev_err(dev, "%s(): Error %d clearing the CONFIGURE register\n",
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__func__, ret);
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chip->als_ir_mode = ISL29028_MODE_NONE;
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chip->enable_prox = false;
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return ret;
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}
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static bool isl29028_is_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case ISL29028_REG_INTERRUPT:
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case ISL29028_REG_PROX_DATA:
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case ISL29028_REG_ALSIR_L:
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case ISL29028_REG_ALSIR_U:
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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 const struct regmap_config isl29028_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.volatile_reg = isl29028_is_volatile_reg,
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.max_register = ISL29028_NUM_REGS - 1,
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.num_reg_defaults_raw = ISL29028_NUM_REGS,
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.cache_type = REGCACHE_RBTREE,
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};
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static int isl29028_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct isl29028_chip *chip;
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struct iio_dev *indio_dev;
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int ret;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
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if (!indio_dev)
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return -ENOMEM;
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chip = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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mutex_init(&chip->lock);
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chip->regmap = devm_regmap_init_i2c(client, &isl29028_regmap_config);
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if (IS_ERR(chip->regmap)) {
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ret = PTR_ERR(chip->regmap);
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dev_err(&client->dev, "%s: Error %d initializing regmap\n",
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__func__, ret);
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return ret;
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}
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chip->enable_prox = false;
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chip->prox_sampling_int = 20;
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chip->prox_sampling_frac = 0;
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chip->lux_scale = 2000;
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ret = regmap_write(chip->regmap, ISL29028_REG_TEST1_MODE, 0x0);
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if (ret < 0) {
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dev_err(&client->dev,
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"%s(): Error %d writing to TEST1_MODE register\n",
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__func__, ret);
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return ret;
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}
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ret = regmap_write(chip->regmap, ISL29028_REG_TEST2_MODE, 0x0);
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if (ret < 0) {
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dev_err(&client->dev,
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"%s(): Error %d writing to TEST2_MODE register\n",
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__func__, ret);
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return ret;
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}
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ret = isl29028_clear_configure_reg(chip);
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if (ret < 0)
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return ret;
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indio_dev->info = &isl29028_info;
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indio_dev->channels = isl29028_channels;
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indio_dev->num_channels = ARRAY_SIZE(isl29028_channels);
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indio_dev->name = id->name;
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indio_dev->dev.parent = &client->dev;
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indio_dev->modes = INDIO_DIRECT_MODE;
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pm_runtime_enable(&client->dev);
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pm_runtime_set_autosuspend_delay(&client->dev,
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ISL29028_POWER_OFF_DELAY_MS);
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pm_runtime_use_autosuspend(&client->dev);
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ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
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if (ret < 0) {
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dev_err(&client->dev,
|
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"%s(): iio registration failed with error %d\n",
|
|
__func__, ret);
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return ret;
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}
|
|
|
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return 0;
|
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}
|
|
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static int isl29028_remove(struct i2c_client *client)
|
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{
|
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct isl29028_chip *chip = iio_priv(indio_dev);
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|
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iio_device_unregister(indio_dev);
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|
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pm_runtime_disable(&client->dev);
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pm_runtime_set_suspended(&client->dev);
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pm_runtime_put_noidle(&client->dev);
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return isl29028_clear_configure_reg(chip);
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}
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static int __maybe_unused isl29028_suspend(struct device *dev)
|
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{
|
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struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
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struct isl29028_chip *chip = iio_priv(indio_dev);
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int ret;
|
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mutex_lock(&chip->lock);
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ret = isl29028_clear_configure_reg(chip);
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mutex_unlock(&chip->lock);
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|
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return ret;
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}
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|
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static int __maybe_unused isl29028_resume(struct device *dev)
|
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{
|
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/**
|
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* The specific component (ALS/IR or proximity) will enable itself as
|
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* needed the next time that the user requests a reading. This is done
|
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* above in isl29028_set_als_ir_mode() and isl29028_enable_proximity().
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*/
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return 0;
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}
|
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|
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static const struct dev_pm_ops isl29028_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
|
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pm_runtime_force_resume)
|
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SET_RUNTIME_PM_OPS(isl29028_suspend, isl29028_resume, NULL)
|
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};
|
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|
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static const struct i2c_device_id isl29028_id[] = {
|
|
{"isl29028", 0},
|
|
{"isl29030", 0},
|
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{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, isl29028_id);
|
|
|
|
static const struct of_device_id isl29028_of_match[] = {
|
|
{ .compatible = "isl,isl29028", }, /* for backward compat., don't use */
|
|
{ .compatible = "isil,isl29028", },
|
|
{ .compatible = "isil,isl29030", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, isl29028_of_match);
|
|
|
|
static struct i2c_driver isl29028_driver = {
|
|
.driver = {
|
|
.name = "isl29028",
|
|
.pm = &isl29028_pm_ops,
|
|
.of_match_table = isl29028_of_match,
|
|
},
|
|
.probe = isl29028_probe,
|
|
.remove = isl29028_remove,
|
|
.id_table = isl29028_id,
|
|
};
|
|
|
|
module_i2c_driver(isl29028_driver);
|
|
|
|
MODULE_DESCRIPTION("ISL29028 Ambient Light and Proximity Sensor driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
|