526 lines
12 KiB
C
526 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* apds9300.c - IIO driver for Avago APDS9300 ambient light sensor
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*
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* Copyright 2013 Oleksandr Kravchenko <o.v.kravchenko@globallogic.com>
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/pm.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/interrupt.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/iio/events.h>
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#define APDS9300_DRV_NAME "apds9300"
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#define APDS9300_IRQ_NAME "apds9300_event"
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/* Command register bits */
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#define APDS9300_CMD BIT(7) /* Select command register. Must write as 1 */
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#define APDS9300_WORD BIT(5) /* I2C write/read: if 1 word, if 0 byte */
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#define APDS9300_CLEAR BIT(6) /* Interrupt clear. Clears pending interrupt */
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/* Register set */
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#define APDS9300_CONTROL 0x00 /* Control of basic functions */
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#define APDS9300_THRESHLOWLOW 0x02 /* Low byte of low interrupt threshold */
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#define APDS9300_THRESHHIGHLOW 0x04 /* Low byte of high interrupt threshold */
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#define APDS9300_INTERRUPT 0x06 /* Interrupt control */
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#define APDS9300_DATA0LOW 0x0c /* Low byte of ADC channel 0 */
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#define APDS9300_DATA1LOW 0x0e /* Low byte of ADC channel 1 */
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/* Power on/off value for APDS9300_CONTROL register */
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#define APDS9300_POWER_ON 0x03
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#define APDS9300_POWER_OFF 0x00
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/* Interrupts */
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#define APDS9300_INTR_ENABLE 0x10
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/* Interrupt Persist Function: Any value outside of threshold range */
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#define APDS9300_THRESH_INTR 0x01
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#define APDS9300_THRESH_MAX 0xffff /* Max threshold value */
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struct apds9300_data {
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struct i2c_client *client;
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struct mutex mutex;
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int power_state;
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int thresh_low;
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int thresh_hi;
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int intr_en;
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};
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/* Lux calculation */
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/* Calculated values 1000 * (CH1/CH0)^1.4 for CH1/CH0 from 0 to 0.52 */
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static const u16 apds9300_lux_ratio[] = {
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0, 2, 4, 7, 11, 15, 19, 24, 29, 34, 40, 45, 51, 57, 64, 70, 77, 84, 91,
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98, 105, 112, 120, 128, 136, 144, 152, 160, 168, 177, 185, 194, 203,
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212, 221, 230, 239, 249, 258, 268, 277, 287, 297, 307, 317, 327, 337,
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347, 358, 368, 379, 390, 400,
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};
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static unsigned long apds9300_calculate_lux(u16 ch0, u16 ch1)
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{
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unsigned long lux, tmp;
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/* avoid division by zero */
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if (ch0 == 0)
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return 0;
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tmp = DIV_ROUND_UP(ch1 * 100, ch0);
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if (tmp <= 52) {
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lux = 3150 * ch0 - (unsigned long)DIV_ROUND_UP_ULL(ch0
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* apds9300_lux_ratio[tmp] * 5930ull, 1000);
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} else if (tmp <= 65) {
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lux = 2290 * ch0 - 2910 * ch1;
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} else if (tmp <= 80) {
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lux = 1570 * ch0 - 1800 * ch1;
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} else if (tmp <= 130) {
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lux = 338 * ch0 - 260 * ch1;
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} else {
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lux = 0;
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}
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return lux / 100000;
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}
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static int apds9300_get_adc_val(struct apds9300_data *data, int adc_number)
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{
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int ret;
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u8 flags = APDS9300_CMD | APDS9300_WORD;
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if (!data->power_state)
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return -EBUSY;
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/* Select ADC0 or ADC1 data register */
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flags |= adc_number ? APDS9300_DATA1LOW : APDS9300_DATA0LOW;
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ret = i2c_smbus_read_word_data(data->client, flags);
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if (ret < 0)
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dev_err(&data->client->dev,
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"failed to read ADC%d value\n", adc_number);
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return ret;
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}
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static int apds9300_set_thresh_low(struct apds9300_data *data, int value)
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{
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int ret;
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if (!data->power_state)
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return -EBUSY;
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if (value > APDS9300_THRESH_MAX)
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return -EINVAL;
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ret = i2c_smbus_write_word_data(data->client, APDS9300_THRESHLOWLOW
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| APDS9300_CMD | APDS9300_WORD, value);
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if (ret) {
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dev_err(&data->client->dev, "failed to set thresh_low\n");
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return ret;
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}
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data->thresh_low = value;
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return 0;
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}
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static int apds9300_set_thresh_hi(struct apds9300_data *data, int value)
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{
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int ret;
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if (!data->power_state)
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return -EBUSY;
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if (value > APDS9300_THRESH_MAX)
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return -EINVAL;
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ret = i2c_smbus_write_word_data(data->client, APDS9300_THRESHHIGHLOW
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| APDS9300_CMD | APDS9300_WORD, value);
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if (ret) {
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dev_err(&data->client->dev, "failed to set thresh_hi\n");
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return ret;
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}
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data->thresh_hi = value;
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return 0;
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}
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static int apds9300_set_intr_state(struct apds9300_data *data, int state)
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{
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int ret;
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u8 cmd;
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if (!data->power_state)
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return -EBUSY;
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cmd = state ? APDS9300_INTR_ENABLE | APDS9300_THRESH_INTR : 0x00;
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ret = i2c_smbus_write_byte_data(data->client,
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APDS9300_INTERRUPT | APDS9300_CMD, cmd);
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if (ret) {
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dev_err(&data->client->dev,
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"failed to set interrupt state %d\n", state);
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return ret;
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}
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data->intr_en = state;
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return 0;
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}
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static int apds9300_set_power_state(struct apds9300_data *data, int state)
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{
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int ret;
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u8 cmd;
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cmd = state ? APDS9300_POWER_ON : APDS9300_POWER_OFF;
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ret = i2c_smbus_write_byte_data(data->client,
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APDS9300_CONTROL | APDS9300_CMD, cmd);
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if (ret) {
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dev_err(&data->client->dev,
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"failed to set power state %d\n", state);
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return ret;
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}
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data->power_state = state;
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return 0;
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}
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static void apds9300_clear_intr(struct apds9300_data *data)
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{
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int ret;
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ret = i2c_smbus_write_byte(data->client, APDS9300_CLEAR | APDS9300_CMD);
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if (ret < 0)
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dev_err(&data->client->dev, "failed to clear interrupt\n");
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}
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static int apds9300_chip_init(struct apds9300_data *data)
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{
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int ret;
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/* Need to set power off to ensure that the chip is off */
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ret = apds9300_set_power_state(data, 0);
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if (ret < 0)
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goto err;
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/*
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* Probe the chip. To do so we try to power up the device and then to
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* read back the 0x03 code
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*/
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ret = apds9300_set_power_state(data, 1);
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if (ret < 0)
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goto err;
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ret = i2c_smbus_read_byte_data(data->client,
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APDS9300_CONTROL | APDS9300_CMD);
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if (ret != APDS9300_POWER_ON) {
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ret = -ENODEV;
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goto err;
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}
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/*
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* Disable interrupt to ensure thai it is doesn't enable
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* i.e. after device soft reset
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*/
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ret = apds9300_set_intr_state(data, 0);
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if (ret < 0)
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goto err;
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return 0;
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err:
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dev_err(&data->client->dev, "failed to init the chip\n");
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return ret;
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}
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static int apds9300_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val, int *val2,
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long mask)
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{
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int ch0, ch1, ret = -EINVAL;
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struct apds9300_data *data = iio_priv(indio_dev);
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mutex_lock(&data->mutex);
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switch (chan->type) {
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case IIO_LIGHT:
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ch0 = apds9300_get_adc_val(data, 0);
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if (ch0 < 0) {
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ret = ch0;
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break;
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}
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ch1 = apds9300_get_adc_val(data, 1);
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if (ch1 < 0) {
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ret = ch1;
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break;
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}
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*val = apds9300_calculate_lux(ch0, ch1);
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ret = IIO_VAL_INT;
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break;
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case IIO_INTENSITY:
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ret = apds9300_get_adc_val(data, chan->channel);
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if (ret < 0)
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break;
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*val = ret;
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ret = IIO_VAL_INT;
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break;
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default:
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break;
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}
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mutex_unlock(&data->mutex);
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return ret;
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}
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static int apds9300_read_thresh(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, enum iio_event_type type,
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enum iio_event_direction dir, enum iio_event_info info,
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int *val, int *val2)
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{
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struct apds9300_data *data = iio_priv(indio_dev);
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switch (dir) {
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case IIO_EV_DIR_RISING:
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*val = data->thresh_hi;
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break;
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case IIO_EV_DIR_FALLING:
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*val = data->thresh_low;
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break;
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default:
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return -EINVAL;
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}
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return IIO_VAL_INT;
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}
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static int apds9300_write_thresh(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, enum iio_event_type type,
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enum iio_event_direction dir, enum iio_event_info info, int val,
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int val2)
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{
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struct apds9300_data *data = iio_priv(indio_dev);
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int ret;
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mutex_lock(&data->mutex);
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if (dir == IIO_EV_DIR_RISING)
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ret = apds9300_set_thresh_hi(data, val);
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else
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ret = apds9300_set_thresh_low(data, val);
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mutex_unlock(&data->mutex);
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return ret;
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}
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static int apds9300_read_interrupt_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir)
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{
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struct apds9300_data *data = iio_priv(indio_dev);
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return data->intr_en;
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}
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static int apds9300_write_interrupt_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, enum iio_event_type type,
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enum iio_event_direction dir, int state)
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{
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struct apds9300_data *data = iio_priv(indio_dev);
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int ret;
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mutex_lock(&data->mutex);
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ret = apds9300_set_intr_state(data, state);
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mutex_unlock(&data->mutex);
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return ret;
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}
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static const struct iio_info apds9300_info_no_irq = {
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.read_raw = apds9300_read_raw,
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};
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static const struct iio_info apds9300_info = {
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.read_raw = apds9300_read_raw,
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.read_event_value = apds9300_read_thresh,
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.write_event_value = apds9300_write_thresh,
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.read_event_config = apds9300_read_interrupt_config,
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.write_event_config = apds9300_write_interrupt_config,
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};
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static const struct iio_event_spec apds9300_event_spec[] = {
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{
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_RISING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE) |
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BIT(IIO_EV_INFO_ENABLE),
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}, {
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_FALLING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE) |
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BIT(IIO_EV_INFO_ENABLE),
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},
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};
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static const struct iio_chan_spec apds9300_channels[] = {
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{
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.type = IIO_LIGHT,
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.channel = 0,
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.indexed = true,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
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}, {
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.type = IIO_INTENSITY,
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.channel = 0,
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.channel2 = IIO_MOD_LIGHT_BOTH,
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.indexed = true,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.event_spec = apds9300_event_spec,
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.num_event_specs = ARRAY_SIZE(apds9300_event_spec),
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}, {
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.type = IIO_INTENSITY,
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.channel = 1,
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.channel2 = IIO_MOD_LIGHT_IR,
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.indexed = true,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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},
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};
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static irqreturn_t apds9300_interrupt_handler(int irq, void *private)
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{
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struct iio_dev *dev_info = private;
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struct apds9300_data *data = iio_priv(dev_info);
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iio_push_event(dev_info,
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IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_EITHER),
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iio_get_time_ns(dev_info));
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apds9300_clear_intr(data);
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return IRQ_HANDLED;
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}
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static int apds9300_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct apds9300_data *data;
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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(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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ret = apds9300_chip_init(data);
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if (ret < 0)
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goto err;
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mutex_init(&data->mutex);
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indio_dev->dev.parent = &client->dev;
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indio_dev->channels = apds9300_channels;
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indio_dev->num_channels = ARRAY_SIZE(apds9300_channels);
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indio_dev->name = APDS9300_DRV_NAME;
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indio_dev->modes = INDIO_DIRECT_MODE;
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if (client->irq)
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indio_dev->info = &apds9300_info;
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else
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indio_dev->info = &apds9300_info_no_irq;
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if (client->irq) {
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ret = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, apds9300_interrupt_handler,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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APDS9300_IRQ_NAME, indio_dev);
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if (ret) {
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dev_err(&client->dev, "irq request error %d\n", -ret);
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goto err;
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}
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}
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ret = iio_device_register(indio_dev);
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if (ret < 0)
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goto err;
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return 0;
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err:
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/* Ensure that power off in case of error */
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apds9300_set_power_state(data, 0);
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return ret;
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}
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static int apds9300_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 apds9300_data *data = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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/* Ensure that power off and interrupts are disabled */
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apds9300_set_intr_state(data, 0);
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apds9300_set_power_state(data, 0);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int apds9300_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 apds9300_data *data = iio_priv(indio_dev);
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int ret;
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mutex_lock(&data->mutex);
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ret = apds9300_set_power_state(data, 0);
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mutex_unlock(&data->mutex);
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return ret;
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}
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static int apds9300_resume(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 apds9300_data *data = iio_priv(indio_dev);
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int ret;
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mutex_lock(&data->mutex);
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ret = apds9300_set_power_state(data, 1);
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mutex_unlock(&data->mutex);
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return ret;
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}
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static SIMPLE_DEV_PM_OPS(apds9300_pm_ops, apds9300_suspend, apds9300_resume);
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#define APDS9300_PM_OPS (&apds9300_pm_ops)
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#else
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#define APDS9300_PM_OPS NULL
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#endif
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static const struct i2c_device_id apds9300_id[] = {
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{ APDS9300_DRV_NAME, 0 },
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{ }
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|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, apds9300_id);
|
|
|
|
static struct i2c_driver apds9300_driver = {
|
|
.driver = {
|
|
.name = APDS9300_DRV_NAME,
|
|
.pm = APDS9300_PM_OPS,
|
|
},
|
|
.probe = apds9300_probe,
|
|
.remove = apds9300_remove,
|
|
.id_table = apds9300_id,
|
|
};
|
|
|
|
module_i2c_driver(apds9300_driver);
|
|
|
|
MODULE_AUTHOR("Kravchenko Oleksandr <o.v.kravchenko@globallogic.com>");
|
|
MODULE_AUTHOR("GlobalLogic inc.");
|
|
MODULE_DESCRIPTION("APDS9300 ambient light photo sensor driver");
|
|
MODULE_LICENSE("GPL");
|