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![Dan Carpenter](/assets/img/avatar_default.png)
This array is supposed to have 10 elements. Smatch complains that with
the current code we can have n == max_ints and read beyond the end of
the array.
Fixes: ac4f6eee8f
("staging: iio: TAOS tsl258x: Device driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Brian Masney <masneyb@onstation.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
913 lines
23 KiB
C
913 lines
23 KiB
C
/*
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* Device driver for monitoring ambient light intensity (lux)
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* within the TAOS tsl258x family of devices (tsl2580, tsl2581, tsl2583).
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*
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* Copyright (c) 2011, TAOS Corporation.
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* Copyright (c) 2016 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
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that 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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#include <linux/kernel.h>
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#include <linux/i2c.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/string.h>
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#include <linux/mutex.h>
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#include <linux/unistd.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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/* Device Registers and Masks */
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#define TSL2583_CNTRL 0x00
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#define TSL2583_ALS_TIME 0X01
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#define TSL2583_INTERRUPT 0x02
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#define TSL2583_GAIN 0x07
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#define TSL2583_REVID 0x11
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#define TSL2583_CHIPID 0x12
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#define TSL2583_ALS_CHAN0LO 0x14
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#define TSL2583_ALS_CHAN0HI 0x15
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#define TSL2583_ALS_CHAN1LO 0x16
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#define TSL2583_ALS_CHAN1HI 0x17
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#define TSL2583_TMR_LO 0x18
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#define TSL2583_TMR_HI 0x19
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/* tsl2583 cmd reg masks */
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#define TSL2583_CMD_REG 0x80
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#define TSL2583_CMD_SPL_FN 0x60
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#define TSL2583_CMD_ALS_INT_CLR 0x01
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/* tsl2583 cntrl reg masks */
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#define TSL2583_CNTL_ADC_ENBL 0x02
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#define TSL2583_CNTL_PWR_OFF 0x00
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#define TSL2583_CNTL_PWR_ON 0x01
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/* tsl2583 status reg masks */
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#define TSL2583_STA_ADC_VALID 0x01
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#define TSL2583_STA_ADC_INTR 0x10
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/* Lux calculation constants */
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#define TSL2583_LUX_CALC_OVER_FLOW 65535
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#define TSL2583_INTERRUPT_DISABLED 0x00
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#define TSL2583_CHIP_ID 0x90
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#define TSL2583_CHIP_ID_MASK 0xf0
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/* Per-device data */
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struct tsl2583_als_info {
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u16 als_ch0;
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u16 als_ch1;
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u16 lux;
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};
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struct tsl2583_lux {
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unsigned int ratio;
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unsigned int ch0;
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unsigned int ch1;
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};
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static const struct tsl2583_lux tsl2583_default_lux[] = {
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{ 9830, 8520, 15729 },
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{ 12452, 10807, 23344 },
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{ 14746, 6383, 11705 },
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{ 17695, 4063, 6554 },
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{ 0, 0, 0 } /* Termination segment */
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};
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#define TSL2583_MAX_LUX_TABLE_ENTRIES 11
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struct tsl2583_settings {
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int als_time;
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int als_gain;
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int als_gain_trim;
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int als_cal_target;
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/*
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* This structure is intentionally large to accommodate updates via
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* sysfs. Sized to 11 = max 10 segments + 1 termination segment.
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* Assumption is that one and only one type of glass used.
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*/
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struct tsl2583_lux als_device_lux[TSL2583_MAX_LUX_TABLE_ENTRIES];
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};
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struct tsl2583_chip {
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struct mutex als_mutex;
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struct i2c_client *client;
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struct tsl2583_als_info als_cur_info;
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struct tsl2583_settings als_settings;
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int als_time_scale;
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int als_saturation;
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bool suspended;
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};
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struct gainadj {
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s16 ch0;
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s16 ch1;
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s16 mean;
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};
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/* Index = (0 - 3) Used to validate the gain selection index */
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static const struct gainadj gainadj[] = {
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{ 1, 1, 1 },
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{ 8, 8, 8 },
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{ 16, 16, 16 },
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{ 107, 115, 111 }
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};
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/*
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* Provides initial operational parameter defaults.
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* These defaults may be changed through the device's sysfs files.
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*/
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static void tsl2583_defaults(struct tsl2583_chip *chip)
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{
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/*
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* The integration time must be a multiple of 50ms and within the
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* range [50, 600] ms.
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*/
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chip->als_settings.als_time = 100;
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/*
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* This is an index into the gainadj table. Assume clear glass as the
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* default.
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*/
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chip->als_settings.als_gain = 0;
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/* Default gain trim to account for aperture effects */
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chip->als_settings.als_gain_trim = 1000;
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/* Known external ALS reading used for calibration */
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chip->als_settings.als_cal_target = 130;
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/* Default lux table. */
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memcpy(chip->als_settings.als_device_lux, tsl2583_default_lux,
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sizeof(tsl2583_default_lux));
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}
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/*
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* Reads and calculates current lux value.
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* The raw ch0 and ch1 values of the ambient light sensed in the last
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* integration cycle are read from the device.
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* Time scale factor array values are adjusted based on the integration time.
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* The raw values are multiplied by a scale factor, and device gain is obtained
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* using gain index. Limit checks are done next, then the ratio of a multiple
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* of ch1 value, to the ch0 value, is calculated. The array als_device_lux[]
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* declared above is then scanned to find the first ratio value that is just
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* above the ratio we just calculated. The ch0 and ch1 multiplier constants in
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* the array are then used along with the time scale factor array values, to
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* calculate the lux.
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*/
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static int tsl2583_get_lux(struct iio_dev *indio_dev)
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{
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u16 ch0, ch1; /* separated ch0/ch1 data from device */
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u32 lux; /* raw lux calculated from device data */
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u64 lux64;
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u32 ratio;
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u8 buf[5];
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struct tsl2583_lux *p;
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struct tsl2583_chip *chip = iio_priv(indio_dev);
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int i, ret;
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ret = i2c_smbus_read_byte_data(chip->client, TSL2583_CMD_REG);
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if (ret < 0) {
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dev_err(&chip->client->dev, "%s: failed to read CMD_REG register\n",
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__func__);
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goto done;
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}
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/* is data new & valid */
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if (!(ret & TSL2583_STA_ADC_INTR)) {
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dev_err(&chip->client->dev, "%s: data not valid; returning last value\n",
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__func__);
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ret = chip->als_cur_info.lux; /* return LAST VALUE */
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goto done;
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}
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for (i = 0; i < 4; i++) {
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int reg = TSL2583_CMD_REG | (TSL2583_ALS_CHAN0LO + i);
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ret = i2c_smbus_read_byte_data(chip->client, reg);
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if (ret < 0) {
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dev_err(&chip->client->dev, "%s: failed to read register %x\n",
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__func__, reg);
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goto done;
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}
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buf[i] = ret;
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}
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/*
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* Clear the pending interrupt status bit on the chip to allow the next
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* integration cycle to start. This has to be done even though this
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* driver currently does not support interrupts.
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*/
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ret = i2c_smbus_write_byte(chip->client,
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(TSL2583_CMD_REG | TSL2583_CMD_SPL_FN |
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TSL2583_CMD_ALS_INT_CLR));
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if (ret < 0) {
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dev_err(&chip->client->dev, "%s: failed to clear the interrupt bit\n",
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__func__);
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goto done; /* have no data, so return failure */
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}
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/* extract ALS/lux data */
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ch0 = le16_to_cpup((const __le16 *)&buf[0]);
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ch1 = le16_to_cpup((const __le16 *)&buf[2]);
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chip->als_cur_info.als_ch0 = ch0;
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chip->als_cur_info.als_ch1 = ch1;
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if ((ch0 >= chip->als_saturation) || (ch1 >= chip->als_saturation))
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goto return_max;
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if (!ch0) {
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/*
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* The sensor appears to be in total darkness so set the
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* calculated lux to 0 and return early to avoid a division by
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* zero below when calculating the ratio.
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*/
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ret = 0;
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chip->als_cur_info.lux = 0;
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goto done;
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}
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/* calculate ratio */
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ratio = (ch1 << 15) / ch0;
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/* convert to unscaled lux using the pointer to the table */
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for (p = (struct tsl2583_lux *)chip->als_settings.als_device_lux;
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p->ratio != 0 && p->ratio < ratio; p++)
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;
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if (p->ratio == 0) {
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lux = 0;
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} else {
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u32 ch0lux, ch1lux;
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ch0lux = ((ch0 * p->ch0) +
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(gainadj[chip->als_settings.als_gain].ch0 >> 1))
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/ gainadj[chip->als_settings.als_gain].ch0;
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ch1lux = ((ch1 * p->ch1) +
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(gainadj[chip->als_settings.als_gain].ch1 >> 1))
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/ gainadj[chip->als_settings.als_gain].ch1;
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/* note: lux is 31 bit max at this point */
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if (ch1lux > ch0lux) {
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dev_dbg(&chip->client->dev, "%s: No Data - Returning 0\n",
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__func__);
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ret = 0;
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chip->als_cur_info.lux = 0;
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goto done;
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}
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lux = ch0lux - ch1lux;
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}
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/* adjust for active time scale */
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if (chip->als_time_scale == 0)
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lux = 0;
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else
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lux = (lux + (chip->als_time_scale >> 1)) /
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chip->als_time_scale;
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/*
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* Adjust for active gain scale.
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* The tsl2583_default_lux tables above have a factor of 8192 built in,
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* so we need to shift right.
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* User-specified gain provides a multiplier.
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* Apply user-specified gain before shifting right to retain precision.
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* Use 64 bits to avoid overflow on multiplication.
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* Then go back to 32 bits before division to avoid using div_u64().
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*/
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lux64 = lux;
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lux64 = lux64 * chip->als_settings.als_gain_trim;
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lux64 >>= 13;
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lux = lux64;
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lux = (lux + 500) / 1000;
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if (lux > TSL2583_LUX_CALC_OVER_FLOW) { /* check for overflow */
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return_max:
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lux = TSL2583_LUX_CALC_OVER_FLOW;
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}
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/* Update the structure with the latest VALID lux. */
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chip->als_cur_info.lux = lux;
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ret = lux;
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done:
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return ret;
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}
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/*
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* Obtain single reading and calculate the als_gain_trim (later used
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* to derive actual lux).
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* Return updated gain_trim value.
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*/
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static int tsl2583_als_calibrate(struct iio_dev *indio_dev)
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{
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struct tsl2583_chip *chip = iio_priv(indio_dev);
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unsigned int gain_trim_val;
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int ret;
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int lux_val;
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ret = i2c_smbus_read_byte_data(chip->client,
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TSL2583_CMD_REG | TSL2583_CNTRL);
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if (ret < 0) {
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dev_err(&chip->client->dev,
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"%s: failed to read from the CNTRL register\n",
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__func__);
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return ret;
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}
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if ((ret & (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON))
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!= (TSL2583_CNTL_ADC_ENBL | TSL2583_CNTL_PWR_ON)) {
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dev_err(&chip->client->dev,
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"%s: Device is not powered on and/or ADC is not enabled\n",
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__func__);
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return -EINVAL;
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} else if ((ret & TSL2583_STA_ADC_VALID) != TSL2583_STA_ADC_VALID) {
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dev_err(&chip->client->dev,
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"%s: The two ADC channels have not completed an integration cycle\n",
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__func__);
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return -ENODATA;
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}
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lux_val = tsl2583_get_lux(indio_dev);
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if (lux_val < 0) {
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dev_err(&chip->client->dev, "%s: failed to get lux\n",
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__func__);
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return lux_val;
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}
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gain_trim_val = (unsigned int)(((chip->als_settings.als_cal_target)
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* chip->als_settings.als_gain_trim) / lux_val);
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if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
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dev_err(&chip->client->dev,
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"%s: trim_val of %d is not within the range [250, 4000]\n",
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__func__, gain_trim_val);
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return -ENODATA;
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}
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chip->als_settings.als_gain_trim = (int)gain_trim_val;
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return 0;
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}
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static int tsl2583_set_als_time(struct tsl2583_chip *chip)
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{
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int als_count, als_time, ret;
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u8 val;
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/* determine als integration register */
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als_count = (chip->als_settings.als_time * 100 + 135) / 270;
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if (!als_count)
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als_count = 1; /* ensure at least one cycle */
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/* convert back to time (encompasses overrides) */
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als_time = (als_count * 27 + 5) / 10;
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val = 256 - als_count;
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ret = i2c_smbus_write_byte_data(chip->client,
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TSL2583_CMD_REG | TSL2583_ALS_TIME,
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val);
|
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if (ret < 0) {
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dev_err(&chip->client->dev, "%s: failed to set the als time to %d\n",
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__func__, val);
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return ret;
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}
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/* set chip struct re scaling and saturation */
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chip->als_saturation = als_count * 922; /* 90% of full scale */
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chip->als_time_scale = (als_time + 25) / 50;
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return ret;
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}
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|
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static int tsl2583_set_als_gain(struct tsl2583_chip *chip)
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{
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int ret;
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/* Set the gain based on als_settings struct */
|
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ret = i2c_smbus_write_byte_data(chip->client,
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TSL2583_CMD_REG | TSL2583_GAIN,
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chip->als_settings.als_gain);
|
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if (ret < 0)
|
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dev_err(&chip->client->dev,
|
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"%s: failed to set the gain to %d\n", __func__,
|
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chip->als_settings.als_gain);
|
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|
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return ret;
|
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}
|
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|
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static int tsl2583_set_power_state(struct tsl2583_chip *chip, u8 state)
|
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{
|
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int ret;
|
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|
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ret = i2c_smbus_write_byte_data(chip->client,
|
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TSL2583_CMD_REG | TSL2583_CNTRL, state);
|
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if (ret < 0)
|
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dev_err(&chip->client->dev,
|
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"%s: failed to set the power state to %d\n", __func__,
|
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state);
|
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|
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return ret;
|
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}
|
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|
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/*
|
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* Turn the device on.
|
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* Configuration must be set before calling this function.
|
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*/
|
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static int tsl2583_chip_init_and_power_on(struct iio_dev *indio_dev)
|
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{
|
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struct tsl2583_chip *chip = iio_priv(indio_dev);
|
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int ret;
|
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|
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/* Power on the device; ADC off. */
|
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ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON);
|
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if (ret < 0)
|
||
return ret;
|
||
|
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ret = i2c_smbus_write_byte_data(chip->client,
|
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TSL2583_CMD_REG | TSL2583_INTERRUPT,
|
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TSL2583_INTERRUPT_DISABLED);
|
||
if (ret < 0) {
|
||
dev_err(&chip->client->dev,
|
||
"%s: failed to disable interrupts\n", __func__);
|
||
return ret;
|
||
}
|
||
|
||
ret = tsl2583_set_als_time(chip);
|
||
if (ret < 0)
|
||
return ret;
|
||
|
||
ret = tsl2583_set_als_gain(chip);
|
||
if (ret < 0)
|
||
return ret;
|
||
|
||
usleep_range(3000, 3500);
|
||
|
||
ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_ON |
|
||
TSL2583_CNTL_ADC_ENBL);
|
||
if (ret < 0)
|
||
return ret;
|
||
|
||
chip->suspended = false;
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Sysfs Interface Functions */
|
||
|
||
static ssize_t in_illuminance_input_target_show(struct device *dev,
|
||
struct device_attribute *attr,
|
||
char *buf)
|
||
{
|
||
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
||
struct tsl2583_chip *chip = iio_priv(indio_dev);
|
||
int ret;
|
||
|
||
mutex_lock(&chip->als_mutex);
|
||
ret = sprintf(buf, "%d\n", chip->als_settings.als_cal_target);
|
||
mutex_unlock(&chip->als_mutex);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static ssize_t in_illuminance_input_target_store(struct device *dev,
|
||
struct device_attribute *attr,
|
||
const char *buf, size_t len)
|
||
{
|
||
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
||
struct tsl2583_chip *chip = iio_priv(indio_dev);
|
||
int value;
|
||
|
||
if (kstrtoint(buf, 0, &value) || !value)
|
||
return -EINVAL;
|
||
|
||
mutex_lock(&chip->als_mutex);
|
||
chip->als_settings.als_cal_target = value;
|
||
mutex_unlock(&chip->als_mutex);
|
||
|
||
return len;
|
||
}
|
||
|
||
static ssize_t in_illuminance_calibrate_store(struct device *dev,
|
||
struct device_attribute *attr,
|
||
const char *buf, size_t len)
|
||
{
|
||
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
||
struct tsl2583_chip *chip = iio_priv(indio_dev);
|
||
int value, ret;
|
||
|
||
if (kstrtoint(buf, 0, &value) || value != 1)
|
||
return -EINVAL;
|
||
|
||
mutex_lock(&chip->als_mutex);
|
||
|
||
if (chip->suspended) {
|
||
ret = -EBUSY;
|
||
goto done;
|
||
}
|
||
|
||
ret = tsl2583_als_calibrate(indio_dev);
|
||
if (ret < 0)
|
||
goto done;
|
||
|
||
ret = len;
|
||
done:
|
||
mutex_unlock(&chip->als_mutex);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static ssize_t in_illuminance_lux_table_show(struct device *dev,
|
||
struct device_attribute *attr,
|
||
char *buf)
|
||
{
|
||
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
||
struct tsl2583_chip *chip = iio_priv(indio_dev);
|
||
unsigned int i;
|
||
int offset = 0;
|
||
|
||
for (i = 0; i < ARRAY_SIZE(chip->als_settings.als_device_lux); i++) {
|
||
offset += sprintf(buf + offset, "%u,%u,%u,",
|
||
chip->als_settings.als_device_lux[i].ratio,
|
||
chip->als_settings.als_device_lux[i].ch0,
|
||
chip->als_settings.als_device_lux[i].ch1);
|
||
if (chip->als_settings.als_device_lux[i].ratio == 0) {
|
||
/*
|
||
* We just printed the first "0" entry.
|
||
* Now get rid of the extra "," and break.
|
||
*/
|
||
offset--;
|
||
break;
|
||
}
|
||
}
|
||
|
||
offset += sprintf(buf + offset, "\n");
|
||
|
||
return offset;
|
||
}
|
||
|
||
static ssize_t in_illuminance_lux_table_store(struct device *dev,
|
||
struct device_attribute *attr,
|
||
const char *buf, size_t len)
|
||
{
|
||
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
||
struct tsl2583_chip *chip = iio_priv(indio_dev);
|
||
const unsigned int max_ints = TSL2583_MAX_LUX_TABLE_ENTRIES * 3;
|
||
int value[TSL2583_MAX_LUX_TABLE_ENTRIES * 3 + 1];
|
||
int ret = -EINVAL;
|
||
unsigned int n;
|
||
|
||
mutex_lock(&chip->als_mutex);
|
||
|
||
get_options(buf, ARRAY_SIZE(value), value);
|
||
|
||
/*
|
||
* We now have an array of ints starting at value[1], and
|
||
* enumerated by value[0].
|
||
* We expect each group of three ints is one table entry,
|
||
* and the last table entry is all 0.
|
||
*/
|
||
n = value[0];
|
||
if ((n % 3) || n < 6 || n > max_ints) {
|
||
dev_err(dev,
|
||
"%s: The number of entries in the lux table must be a multiple of 3 and within the range [6, %d]\n",
|
||
__func__, max_ints);
|
||
goto done;
|
||
}
|
||
if ((value[n - 2] | value[n - 1] | value[n]) != 0) {
|
||
dev_err(dev, "%s: The last 3 entries in the lux table must be zeros.\n",
|
||
__func__);
|
||
goto done;
|
||
}
|
||
|
||
memcpy(chip->als_settings.als_device_lux, &value[1],
|
||
value[0] * sizeof(value[1]));
|
||
|
||
ret = len;
|
||
|
||
done:
|
||
mutex_unlock(&chip->als_mutex);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static IIO_CONST_ATTR(in_illuminance_calibscale_available, "1 8 16 111");
|
||
static IIO_CONST_ATTR(in_illuminance_integration_time_available,
|
||
"0.000050 0.000100 0.000150 0.000200 0.000250 0.000300 0.000350 0.000400 0.000450 0.000500 0.000550 0.000600 0.000650");
|
||
static IIO_DEVICE_ATTR_RW(in_illuminance_input_target, 0);
|
||
static IIO_DEVICE_ATTR_WO(in_illuminance_calibrate, 0);
|
||
static IIO_DEVICE_ATTR_RW(in_illuminance_lux_table, 0);
|
||
|
||
static struct attribute *sysfs_attrs_ctrl[] = {
|
||
&iio_const_attr_in_illuminance_calibscale_available.dev_attr.attr,
|
||
&iio_const_attr_in_illuminance_integration_time_available.dev_attr.attr,
|
||
&iio_dev_attr_in_illuminance_input_target.dev_attr.attr,
|
||
&iio_dev_attr_in_illuminance_calibrate.dev_attr.attr,
|
||
&iio_dev_attr_in_illuminance_lux_table.dev_attr.attr,
|
||
NULL
|
||
};
|
||
|
||
static const struct attribute_group tsl2583_attribute_group = {
|
||
.attrs = sysfs_attrs_ctrl,
|
||
};
|
||
|
||
static const struct iio_chan_spec tsl2583_channels[] = {
|
||
{
|
||
.type = IIO_LIGHT,
|
||
.modified = 1,
|
||
.channel2 = IIO_MOD_LIGHT_IR,
|
||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
|
||
},
|
||
{
|
||
.type = IIO_LIGHT,
|
||
.modified = 1,
|
||
.channel2 = IIO_MOD_LIGHT_BOTH,
|
||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
|
||
},
|
||
{
|
||
.type = IIO_LIGHT,
|
||
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
|
||
BIT(IIO_CHAN_INFO_CALIBBIAS) |
|
||
BIT(IIO_CHAN_INFO_CALIBSCALE) |
|
||
BIT(IIO_CHAN_INFO_INT_TIME),
|
||
},
|
||
};
|
||
|
||
static int tsl2583_read_raw(struct iio_dev *indio_dev,
|
||
struct iio_chan_spec const *chan,
|
||
int *val, int *val2, long mask)
|
||
{
|
||
struct tsl2583_chip *chip = iio_priv(indio_dev);
|
||
int ret = -EINVAL;
|
||
|
||
mutex_lock(&chip->als_mutex);
|
||
|
||
if (chip->suspended) {
|
||
ret = -EBUSY;
|
||
goto read_done;
|
||
}
|
||
|
||
switch (mask) {
|
||
case IIO_CHAN_INFO_RAW:
|
||
if (chan->type == IIO_LIGHT) {
|
||
ret = tsl2583_get_lux(indio_dev);
|
||
if (ret < 0)
|
||
goto read_done;
|
||
|
||
/*
|
||
* From page 20 of the TSL2581, TSL2583 data
|
||
* sheet (TAOS134 − MARCH 2011):
|
||
*
|
||
* One of the photodiodes (channel 0) is
|
||
* sensitive to both visible and infrared light,
|
||
* while the second photodiode (channel 1) is
|
||
* sensitive primarily to infrared light.
|
||
*/
|
||
if (chan->channel2 == IIO_MOD_LIGHT_BOTH)
|
||
*val = chip->als_cur_info.als_ch0;
|
||
else
|
||
*val = chip->als_cur_info.als_ch1;
|
||
|
||
ret = IIO_VAL_INT;
|
||
}
|
||
break;
|
||
case IIO_CHAN_INFO_PROCESSED:
|
||
if (chan->type == IIO_LIGHT) {
|
||
ret = tsl2583_get_lux(indio_dev);
|
||
if (ret < 0)
|
||
goto read_done;
|
||
|
||
*val = ret;
|
||
ret = IIO_VAL_INT;
|
||
}
|
||
break;
|
||
case IIO_CHAN_INFO_CALIBBIAS:
|
||
if (chan->type == IIO_LIGHT) {
|
||
*val = chip->als_settings.als_gain_trim;
|
||
ret = IIO_VAL_INT;
|
||
}
|
||
break;
|
||
case IIO_CHAN_INFO_CALIBSCALE:
|
||
if (chan->type == IIO_LIGHT) {
|
||
*val = gainadj[chip->als_settings.als_gain].mean;
|
||
ret = IIO_VAL_INT;
|
||
}
|
||
break;
|
||
case IIO_CHAN_INFO_INT_TIME:
|
||
if (chan->type == IIO_LIGHT) {
|
||
*val = 0;
|
||
*val2 = chip->als_settings.als_time;
|
||
ret = IIO_VAL_INT_PLUS_MICRO;
|
||
}
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
read_done:
|
||
mutex_unlock(&chip->als_mutex);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static int tsl2583_write_raw(struct iio_dev *indio_dev,
|
||
struct iio_chan_spec const *chan,
|
||
int val, int val2, long mask)
|
||
{
|
||
struct tsl2583_chip *chip = iio_priv(indio_dev);
|
||
int ret = -EINVAL;
|
||
|
||
mutex_lock(&chip->als_mutex);
|
||
|
||
if (chip->suspended) {
|
||
ret = -EBUSY;
|
||
goto write_done;
|
||
}
|
||
|
||
switch (mask) {
|
||
case IIO_CHAN_INFO_CALIBBIAS:
|
||
if (chan->type == IIO_LIGHT) {
|
||
chip->als_settings.als_gain_trim = val;
|
||
ret = 0;
|
||
}
|
||
break;
|
||
case IIO_CHAN_INFO_CALIBSCALE:
|
||
if (chan->type == IIO_LIGHT) {
|
||
unsigned int i;
|
||
|
||
for (i = 0; i < ARRAY_SIZE(gainadj); i++) {
|
||
if (gainadj[i].mean == val) {
|
||
chip->als_settings.als_gain = i;
|
||
ret = tsl2583_set_als_gain(chip);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
break;
|
||
case IIO_CHAN_INFO_INT_TIME:
|
||
if (chan->type == IIO_LIGHT && !val && val2 >= 50 &&
|
||
val2 <= 650 && !(val2 % 50)) {
|
||
chip->als_settings.als_time = val2;
|
||
ret = tsl2583_set_als_time(chip);
|
||
}
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
|
||
write_done:
|
||
mutex_unlock(&chip->als_mutex);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static const struct iio_info tsl2583_info = {
|
||
.attrs = &tsl2583_attribute_group,
|
||
.driver_module = THIS_MODULE,
|
||
.read_raw = tsl2583_read_raw,
|
||
.write_raw = tsl2583_write_raw,
|
||
};
|
||
|
||
static int tsl2583_probe(struct i2c_client *clientp,
|
||
const struct i2c_device_id *idp)
|
||
{
|
||
int ret;
|
||
struct tsl2583_chip *chip;
|
||
struct iio_dev *indio_dev;
|
||
|
||
if (!i2c_check_functionality(clientp->adapter,
|
||
I2C_FUNC_SMBUS_BYTE_DATA)) {
|
||
dev_err(&clientp->dev, "%s: i2c smbus byte data functionality is unsupported\n",
|
||
__func__);
|
||
return -EOPNOTSUPP;
|
||
}
|
||
|
||
indio_dev = devm_iio_device_alloc(&clientp->dev, sizeof(*chip));
|
||
if (!indio_dev)
|
||
return -ENOMEM;
|
||
|
||
chip = iio_priv(indio_dev);
|
||
chip->client = clientp;
|
||
i2c_set_clientdata(clientp, indio_dev);
|
||
|
||
mutex_init(&chip->als_mutex);
|
||
chip->suspended = true;
|
||
|
||
ret = i2c_smbus_read_byte_data(clientp,
|
||
TSL2583_CMD_REG | TSL2583_CHIPID);
|
||
if (ret < 0) {
|
||
dev_err(&clientp->dev,
|
||
"%s: failed to read the chip ID register\n", __func__);
|
||
return ret;
|
||
}
|
||
|
||
if ((ret & TSL2583_CHIP_ID_MASK) != TSL2583_CHIP_ID) {
|
||
dev_err(&clientp->dev, "%s: received an unknown chip ID %x\n",
|
||
__func__, ret);
|
||
return -EINVAL;
|
||
}
|
||
|
||
indio_dev->info = &tsl2583_info;
|
||
indio_dev->channels = tsl2583_channels;
|
||
indio_dev->num_channels = ARRAY_SIZE(tsl2583_channels);
|
||
indio_dev->dev.parent = &clientp->dev;
|
||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||
indio_dev->name = chip->client->name;
|
||
|
||
ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
|
||
if (ret) {
|
||
dev_err(&clientp->dev, "%s: iio registration failed\n",
|
||
__func__);
|
||
return ret;
|
||
}
|
||
|
||
/* Load up the V2 defaults (these are hard coded defaults for now) */
|
||
tsl2583_defaults(chip);
|
||
|
||
/* Make sure the chip is on */
|
||
ret = tsl2583_chip_init_and_power_on(indio_dev);
|
||
if (ret < 0)
|
||
return ret;
|
||
|
||
dev_info(&clientp->dev, "Light sensor found.\n");
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int __maybe_unused tsl2583_suspend(struct device *dev)
|
||
{
|
||
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
||
struct tsl2583_chip *chip = iio_priv(indio_dev);
|
||
int ret;
|
||
|
||
mutex_lock(&chip->als_mutex);
|
||
|
||
ret = tsl2583_set_power_state(chip, TSL2583_CNTL_PWR_OFF);
|
||
chip->suspended = true;
|
||
|
||
mutex_unlock(&chip->als_mutex);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static int __maybe_unused tsl2583_resume(struct device *dev)
|
||
{
|
||
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
||
struct tsl2583_chip *chip = iio_priv(indio_dev);
|
||
int ret;
|
||
|
||
mutex_lock(&chip->als_mutex);
|
||
|
||
ret = tsl2583_chip_init_and_power_on(indio_dev);
|
||
|
||
mutex_unlock(&chip->als_mutex);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static SIMPLE_DEV_PM_OPS(tsl2583_pm_ops, tsl2583_suspend, tsl2583_resume);
|
||
|
||
static struct i2c_device_id tsl2583_idtable[] = {
|
||
{ "tsl2580", 0 },
|
||
{ "tsl2581", 1 },
|
||
{ "tsl2583", 2 },
|
||
{}
|
||
};
|
||
MODULE_DEVICE_TABLE(i2c, tsl2583_idtable);
|
||
|
||
static const struct of_device_id tsl2583_of_match[] = {
|
||
{ .compatible = "amstaos,tsl2580", },
|
||
{ .compatible = "amstaos,tsl2581", },
|
||
{ .compatible = "amstaos,tsl2583", },
|
||
{ },
|
||
};
|
||
MODULE_DEVICE_TABLE(of, tsl2583_of_match);
|
||
|
||
/* Driver definition */
|
||
static struct i2c_driver tsl2583_driver = {
|
||
.driver = {
|
||
.name = "tsl2583",
|
||
.pm = &tsl2583_pm_ops,
|
||
.of_match_table = tsl2583_of_match,
|
||
},
|
||
.id_table = tsl2583_idtable,
|
||
.probe = tsl2583_probe,
|
||
};
|
||
module_i2c_driver(tsl2583_driver);
|
||
|
||
MODULE_AUTHOR("J. August Brenner <jbrenner@taosinc.com>");
|
||
MODULE_AUTHOR("Brian Masney <masneyb@onstation.org>");
|
||
MODULE_DESCRIPTION("TAOS tsl2583 ambient light sensor driver");
|
||
MODULE_LICENSE("GPL");
|