[PATCH V1] TAOS tsl2671 Device Driver

From: Jon Brenner
Date: Wed Apr 27 2011 - 15:41:23 EST

[PATCH v1] for TAOS tsl2671 (Proximity Only) Device driver

Driver includes (iio_event/interrupt).

Signed-off-by: Jon Brenner <jbrenner@xxxxxxxxxxx>

---
drivers/staging/iio/light/Kconfig | 9 +
drivers/staging/iio/light/Makefile | 1 +
drivers/staging/iio/light/tsl2671.c | 1080 +++++++++++++++++++++++++++++++++++
3 files changed, 1090 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/iio/light/Kconfig b/drivers/staging/iio/light/Kconfig
index 36d8bbe..3ead1c5 100644
--- a/drivers/staging/iio/light/Kconfig
+++ b/drivers/staging/iio/light/Kconfig
@@ -24,3 +24,12 @@ config SENSORS_ISL29018
in lux, proximity infrared sensing and normal infrared sensing.
Data from sensor is accessible via sysfs.

+config SENSORS_TSL2671
+ tristate "TAOS TSL2671 proximity sensor"
+ depends on I2C
+ help
+ Y = in kernel.
+ M = as module.
+ Provides support for TAOS tsl2671 devices.
+ Access PROXIMITY data via iio, sysfs.
+
diff --git a/drivers/staging/iio/light/Makefile b/drivers/staging/iio/light/Makefile
index 9142c0e..0528443 100644
--- a/drivers/staging/iio/light/Makefile
+++ b/drivers/staging/iio/light/Makefile
@@ -4,3 +4,4 @@

obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o
+obj-$(CONFIG_SENSORS_TSL2671) += tsl2671.o
diff --git a/drivers/staging/iio/light/tsl2671.c b/drivers/staging/iio/light/tsl2671.c
new file mode 100644
index 0000000..a521130
--- /dev/null
+++ b/drivers/staging/iio/light/tsl2671.c
@@ -0,0 +1,1080 @@
+/*
+ * Device driver for the TAOS TSL2671 proximity sensor.
+ * Copyright (c) 2011, TAOS Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/i2c.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/mutex.h>
+#include <linux/unistd.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include "../iio.h"
+#include "../sysfs.h"
+
+/* 2571 register offsets */
+#define TSL2671_MAX_DEVICE_REGS 32
+#define TSL2671_REG_MAX 16
+
+/* Device Registers and Masks */
+#define TSL2671_CNTRL 0x00
+#define TSL2671_PRX_MINTHRESHLO 0X08
+#define TSL2671_PRX_MINTHRESHHI 0X09
+#define TSL2671_PRX_MAXTHRESHLO 0X0A
+#define TSL2671_PRX_MAXTHRESHHI 0X0B
+
+#define TSL2671_PERSISTENCE 0x0c
+
+#define TSL2671_PRX_COUNT 0x0E
+#define TSL2671_GAIN 0x0f
+#define TSL2671_STATUS 0x13
+#define TSL2671_REVID 0x11
+#define TSL2671_CHIPID 0x12
+#define TSL2671_PRX_LO 0x18
+#define TSL2671_PRX_HI 0x19
+
+/* tsl2671 cmd reg masks */
+#define TSL2671_CMD_REG 0x80
+#define TSL2671_CMD_SPL_FN 0x60
+
+#define CMD_PROXALS_INT_CLR 0X07
+
+/* tsl2671 cntrl reg masks */
+#define TSL2671_CNTL_ADC_ENBL 0x02
+#define TSL2671_CNTL_PWR_ON 0x01
+
+/* tsl2671 status reg masks */
+#define TSL2671_STA_ADC_VALID 0x01
+#define TSL2671_STA_PRX_VALID 0x02
+#define TSL2671_STA_ADC_PRX_VALID 0x03
+#define STA_ADCINTR 0x10
+#define STA_PRXINTR 0x20
+
+#define TSL2671_STA_ADC_INTR 0x10
+
+/* Triton cntrl reg masks */
+#define CNTL_REG_CLEAR 0x00
+#define CNTL_PROX_INT_ENBL 0X20
+#define TSL2671_CNTL_WAIT_TMR_ENBL 0X08
+#define CNTL_PROX_DET_ENBL 0X04
+#define CNTL_ADC_ENBL 0x02
+#define TSL2671_CNTL_PWRON 0x01
+#define CNTL_PROXPON_ENBL 0x0F
+#define CNTL_INTPROXPON_ENBL 0x2F
+#define TSL2671_CMD_PROXALS_INTCLR 0X07
+
+/*Prox diode to use */
+#define DIODE0 0x10
+#define DIODE1 0x20
+#define DIODE_BOTH 0x30
+
+/* LED Power */
+#define mA100 0x00
+#define mA50 0x40
+#define mA25 0x80
+#define mA13 0xD0
+
+/* Cal defs*/
+#define PROX_STAT_CAL 0
+#define PROX_STAT_SAMP 1
+#define MAX_SAMPLES_CAL 200
+
+enum {
+ TSL2671_CHIP_UNKNOWN = 0,
+ TSL2671_CHIP_WORKING = 1,
+ TSL2671_CHIP_SUSPENDED = 2
+} TSL2671_CHIP_WORKING_STATUS;
+
+/* proximity data */
+struct taos_prox_info {
+ u16 prox_data;
+ int prox_event;
+};
+
+struct prox_stat {
+ u16 min;
+ u16 max;
+ u16 mean;
+ unsigned long stddev;
+} ;
+
+struct taos_settings {
+ u8 interrupt;
+ u8 persistence;
+ int prox_thres;
+ int prox_pulse_count;
+ int prox_max_samples_cal; /* for calibration mode*/
+
+};
+
+#define MAXPROXFILTER 100
+
+u16 taos_prox_filter_data[MAXPROXFILTER]; /*history buffer*/
+
+struct tsl2671_chip {
+ struct mutex prox_mutex;
+ struct i2c_client *client;
+ struct iio_dev *iio_dev;
+ struct taos_prox_info prox_cur_info;
+ struct taos_settings taos_settings;
+ int taos_chip_status;
+ u8 taos_config[TSL2671_REG_MAX];
+ bool init_done;
+ struct work_struct work_thresh;
+ s64 event_timestamp;
+ unsigned int irq_no;
+};
+
+/*
+ * Initial values for device - this values can/will be changed by driver.
+ * and applications as needed.
+ * These values are dynamic.
+ */
+static u8 tsl2671_taos_config[] = {
+ 0x00, 0xee, 0xFF, 0xF5, 0x00, 0x00, 0x00, 0x00,
+ /* Enabl itime ptime wtime NA NA NA NA */
+ 0x00, 0x00, 0x00, 0x03, 0x10, 0x00, 0x0a, 0x20
+ /* PtL0 PtL1 PtH0 PtH1 Pers CFG Pcnt CTRL */
+};
+
+/*
+ * Read a number of bytes starting at register (reg) location.
+ * Return 0, or i2c_smbus_write_byte ERROR code.
+ */
+static int
+taos_i2c_read(struct i2c_client *client, u8 reg, u8 *val, unsigned int len)
+{
+ int ret;
+ int i;
+
+ for (i = 0; i < len; i++) {
+ /* select register to write */
+ ret = i2c_smbus_write_byte(client, (TSL2671_CMD_REG | reg));
+ if (ret < 0) {
+ dev_err(&client->dev, "taos_i2c_read failed to write"
+ " register %x\n", reg);
+ return ret;
+ }
+ /* read the data */
+ *val = i2c_smbus_read_byte(client);
+ val++;
+ reg++;
+ }
+ return 0;
+}
+
+/*
+ * Proximity poll function - if valid data is available, read and form the ch0
+ * and prox data values, check for limits on the ch0 value, and check the prox
+ * data against the current thresholds, to set the event status accordingly.
+ */
+int taos_prox_poll(struct i2c_client *client)
+{
+#define CONSECUTIVE_RETRIES 50
+
+int i;
+int ret;
+u8 status;
+u8 chdata[2];
+int err_cnt;
+struct tsl2671_chip *chip = i2c_get_clientdata(client);
+
+ if (mutex_trylock(&chip->prox_mutex) == 0) {
+ dev_err(&client->dev, "Can't get prox mutex\n");
+ return -1;
+ }
+
+ err_cnt = 0;
+
+tryAgain:
+ ret = taos_i2c_read(client,
+ (TSL2671_CMD_REG | TSL2671_STATUS), &status, 1);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Read regs failed in taos_prox_poll() - A\n");
+ mutex_unlock(&chip->prox_mutex);
+ return ret;
+ }
+
+ /*Prox interrupt asserted*/
+ if (((chip->taos_settings.interrupt << 4) & CNTL_PROX_INT_ENBL)) {
+ if (!(status & TSL2671_STA_ADC_VALID)) {
+ err_cnt++;
+ if (err_cnt > CONSECUTIVE_RETRIES) {
+ mutex_unlock(&chip->prox_mutex);
+ dev_err(&client->dev, "Consec. retries exceeded\n");
+ return chip->prox_cur_info.prox_event;
+ }
+ goto tryAgain;
+ }
+ }
+
+ for (i = 0; i < 2; i++) {
+ ret = taos_i2c_read(client,
+ (TSL2671_CMD_REG |
+ (TSL2671_PRX_LO + i)), &chdata[i], 1);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "Read regs failed in taos_prox_poll() - B\n");
+ mutex_unlock(&chip->prox_mutex);
+ return ret;
+ }
+ }
+
+ chip->prox_cur_info.prox_data = (chdata[1]<<8)|chdata[0];
+
+ if (chip->prox_cur_info.prox_data >= chip->taos_settings.prox_thres)
+ chip->prox_cur_info.prox_event = 1;
+ else
+ chip->prox_cur_info.prox_event = 0;
+
+ mutex_unlock(&chip->prox_mutex);
+ return chip->prox_cur_info.prox_event;
+}
+
+/*
+ * Proximity detect interrupt BH - called when proximity of an object
+ * to the sensor is detected (event = 1), or, once detected, it has moved away
+ * from the sensor (event = 0).
+ * Prox info is stored into the structure "prox_cur_inf",
+ * and signal is issued to any waiting user mode threads -
+ * which must be (of course) registered to be signaled.
+ * This is the called from the 'bottom half' of IRQ.
+ */
+void taos_prox_adjust_level(struct work_struct *prox)
+{
+ int ret = 0, i;
+ u16 cdelta;
+ u8 prox_low[2];
+ u8 prox_high[2];
+ struct tsl2671_chip *chip
+ = container_of(prox,
+ struct tsl2671_chip, work_thresh);
+
+ taos_prox_poll(chip->client);
+
+ if (chip->prox_cur_info.prox_data > chip->taos_settings.prox_thres) {
+ dev_info(&chip->client->dev,
+ "prox_data > prox_thres");
+ /*Rail the threshold so we don't keep interrupting*/
+ prox_high[0] = 0xFF;
+ prox_high[1] = 0xFF;
+ for (i = 0; i < 2; i++) {
+ ret = i2c_smbus_write_byte_data(chip->client,
+ (TSL2671_CMD_REG |
+ (TSL2671_PRX_MAXTHRESHLO + i)),
+ prox_high[i]);
+
+ if (ret < 0)
+ dev_err(&chip->client->dev,
+ "FAILED: to update PROX HIGH THRESH (A).\n");
+ }
+
+ cdelta = chip->taos_settings.prox_thres - 100;
+
+ if (cdelta < 10)
+ cdelta = chip->taos_settings.prox_thres - 1;
+
+ prox_low[0] = (cdelta) & 0xFF;
+ prox_low[1] = (cdelta >> 8) & 0xFF;
+ for (i = 0; i < 2; i++) {
+ i2c_smbus_write_byte_data(chip->client,
+ (TSL2671_CMD_REG |
+ (TSL2671_PRX_MINTHRESHLO + i)),
+ prox_low[i]);
+
+ if (ret < 0)
+ dev_err(&chip->client->dev,
+ "FAILED: to update the PROX LOW THRESH (B).\n");
+ }
+ } else if (chip->prox_cur_info.prox_data <
+ chip->taos_settings.prox_thres) {
+ dev_info(&chip->client->dev,
+ "prox_data <= prox_thres");
+ prox_low[0] = 0x00;
+ prox_low[1] = 0x00;
+ for (i = 0; i < 2; i++) {
+ ret = i2c_smbus_write_byte_data(chip->client,
+ (TSL2671_CMD_REG |
+ (TSL2671_PRX_MINTHRESHLO + i)),
+ prox_low[i]);
+
+ if (ret < 0)
+ dev_err(&chip->client->dev,
+ "FAILED: to update the PROX LOW THRESH (C).\n");
+ }
+ /*Lastly we put the high threshols back to where we started*/
+ prox_high[0] = (chip->taos_settings.prox_thres) & 0xFF;
+ prox_high[1] = (chip->taos_settings.prox_thres >> 8) & 0xFF;
+ for (i = 0; i < 2; i++) {
+ ret = i2c_smbus_write_byte_data(chip->client,
+ (TSL2671_CMD_REG |
+ (TSL2671_PRX_MAXTHRESHLO + i)),
+ prox_high[i]);
+
+ if (ret < 0)
+ dev_err(&chip->client->dev,
+ "FAILED: to update PROX HIGH THRESH (D).\n");
+ }
+
+ }
+
+return;
+}
+
+/*
+ * Proximity interrupt BH - called when the proximity threshold
+ * falls above or below a set value.
+ */
+void taos_interrupt_bh(struct work_struct *prox)
+{
+int ret;
+int value;
+u8 reg_val;
+
+struct tsl2671_chip *chip
+ = container_of(prox,
+ struct tsl2671_chip, work_thresh);
+
+ value = i2c_smbus_read_byte_data(chip->client,
+ TSL2671_CMD_REG | TSL2671_STATUS);
+
+ if ((value & STA_PRXINTR) &&
+ (chip->taos_settings.interrupt & CNTL_PROX_INT_ENBL)) {
+ iio_push_event(chip->iio_dev, 0,
+ IIO_UNMOD_EVENT_CODE(IIO_EV_CLASS_PROXIMITY,
+ 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_EITHER),
+ chip->event_timestamp);
+ taos_prox_adjust_level(prox);
+ }
+
+ if (!chip->init_done) {
+ /* Maintain the persistence value */
+ ret = taos_i2c_read(chip->client,
+ (TSL2671_CMD_REG | (TSL2671_PERSISTENCE)),
+ &reg_val, 1);
+ if (ret < 0)
+ dev_info(&chip->client->dev,
+ "Failed to get the persistence register value\n");
+
+ reg_val = chip->taos_settings.persistence;
+
+ ret = i2c_smbus_write_byte_data(chip->client,
+ (TSL2671_CMD_REG | TSL2671_PERSISTENCE), reg_val);
+ if (ret < 0)
+ dev_info(&chip->client->dev,
+ "FAILED: update the persistence (B).\n");
+ }
+
+ chip->init_done = 1;
+
+ /* Clear out any initial irq status */
+ ret = i2c_smbus_write_byte(chip->client,
+ (TSL2671_CMD_REG |
+ TSL2671_CMD_SPL_FN |
+ TSL2671_CMD_PROXALS_INTCLR));
+ if (ret < 0)
+ dev_info(&chip->client->dev,
+ "taos_interrupt_bh FAILED to clear irqs: err = %d\n", ret);
+
+ enable_irq(chip->irq_no);
+
+return;
+}
+
+/*
+ * Provides initial operational parameter defaults.
+ * These defaults may be changed through the device's ABI.
+ */
+static void taos_defaults(struct tsl2671_chip *chip)
+{
+ /* Operational parameters */
+ chip->taos_settings.persistence = 0x10;
+ /* Number of 'out of limits' ADC readings */
+ chip->taos_settings.interrupt = 0x30;
+ /* Default interrupt enabled. */
+ chip->taos_settings.prox_thres = 512;
+ /*default threshold (adjust either manually or with cal routine*/
+ chip->taos_settings.prox_max_samples_cal = 100;
+ chip->taos_settings.prox_pulse_count = 10;
+
+}
+
+/*
+ * Turn the device on.
+ * Configuration must be set before calling this function.
+ */
+static int taos_chip_on(struct i2c_client *client)
+{
+ int i;
+ int ret = 0;
+ u8 *uP;
+ u8 utmp;
+ struct tsl2671_chip *chip = i2c_get_clientdata(client);
+ u8 reg_val;
+
+ /* Non calculated parameters */
+ chip->taos_config[TSL2671_PERSISTENCE] =
+ chip->taos_settings.persistence;
+
+ chip->taos_config[TSL2671_PRX_COUNT] =
+ chip->taos_settings.prox_pulse_count;
+ chip->taos_config[TSL2671_PRX_MINTHRESHLO] = 0;
+ chip->taos_config[TSL2671_PRX_MAXTHRESHLO] =
+ chip->taos_settings.prox_thres;
+
+ /* and make sure we're not already on */
+ if (chip->taos_chip_status == TSL2671_CHIP_WORKING) {
+ /* if forcing a register update - turn off, then on */
+ dev_info(&client->dev, "device is already enabled\n");
+ return -EINVAL;
+ }
+
+ /* Set the emitter and gain based on taos_settings struct */
+ chip->taos_config[TSL2671_GAIN] = (mA100 | DIODE_BOTH);
+
+ /* TSL2671 Specific power-on / adc enable sequence
+ * Power on the device 1st. */
+ utmp = TSL2671_CNTL_PWR_ON;
+ ret = i2c_smbus_write_byte_data(client,
+ TSL2671_CMD_REG | TSL2671_CNTRL, utmp);
+ if (ret < 0) {
+ dev_err(&client->dev, "taos_chip_on failed on CNTRL reg.\n");
+ return -1;
+ }
+
+ /* Use the following shadow copy for our delay before enabling ADC.
+ * Write all the registers. */
+ for (i = 0, uP = chip->taos_config; i < TSL2671_REG_MAX; i++) {
+ ret = i2c_smbus_write_byte_data(client, TSL2671_CMD_REG + i,
+ *uP++);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "taos_chip_on failed on write to reg %d.\n", i);
+ return ret;
+ }
+ }
+
+ msleep(3);
+ /* NOW enable the ADC */
+ utmp = TSL2671_CNTL_PWR_ON | TSL2671_CNTL_ADC_ENBL;
+ ret = i2c_smbus_write_byte_data(client, TSL2671_CMD_REG | TSL2671_CNTRL,
+ utmp);
+ if (ret < 0) {
+ dev_err(&client->dev, "taos_chip_on failed on 2nd CTRL reg.\n");
+ return ret;
+ }
+
+ chip->taos_chip_status = TSL2671_CHIP_WORKING;
+
+ /* If interrupts are enabled */
+ chip->init_done = 0;
+
+ if (chip->taos_settings.interrupt) {
+ dev_info(&client->dev, "Setting Up Interrupt(s)\n");
+ /* first time interrupt */
+ chip->init_done = 0;
+
+ /*First make sure we have persistence > 0
+ else we'll interrupt continuously.*/
+ ret = taos_i2c_read(client,
+ (TSL2671_CMD_REG | TSL2671_PERSISTENCE), &reg_val, 1);
+ if (ret < 0)
+ dev_err(&client->dev,
+ "Failed to get the persistence register value\n");
+
+ /*Prox Interrupt after 1 reading out of range */
+ if ((reg_val & 0x0F) == 0) {
+ reg_val |= 0x10;
+ ret = i2c_smbus_write_byte_data(client,
+ (TSL2671_CMD_REG | (TSL2671_PERSISTENCE)), reg_val);
+
+ if (ret < 0)
+ dev_err(&client->dev,
+ "taos_i2c_write to update the persistance register.\n");
+ }
+
+ reg_val = TSL2671_CNTL_PWR_ON | CNTL_ADC_ENBL | CNTL_PROX_DET_ENBL;
+ reg_val |= chip->taos_settings.interrupt;
+
+ ret = i2c_smbus_write_byte_data(client,
+ (TSL2671_CMD_REG | TSL2671_CNTRL), reg_val);
+ if (ret < 0)
+ dev_err(&client->dev,
+ "taos_i2c_write to device failed in TAOS_IOCTL_INT_SET.\n");
+
+ /* Clear out any initial interrupt */
+ ret = i2c_smbus_write_byte(client,
+ TSL2671_CMD_REG | TSL2671_CMD_SPL_FN |
+ TSL2671_CMD_PROXALS_INTCLR);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "taos_i2c_write_command failed in taos_chip_on\n");
+ return ret;
+ }
+ }
+
+ return ret;
+
+}
+
+static int taos_chip_off(struct i2c_client *client)
+{
+ struct tsl2671_chip *chip = i2c_get_clientdata(client);
+
+ /* turn device off */
+ chip->taos_chip_status = TSL2671_CHIP_SUSPENDED;
+ return i2c_smbus_write_byte_data(client,
+ TSL2671_CMD_REG | TSL2671_CNTRL, 0x00);
+}
+
+/**
+ * Integer Square Root
+ * We need an integer version since 1st Floating point is not allowed
+ * in driver world, 2nd, cannot count on the devices having a FPU, and
+ * 3rd software FP emulation may be excessive.
+ */
+unsigned long taos_isqrt(unsigned long x)
+{
+register unsigned long op, res, one;
+op = x;
+res = 0;
+
+ one = 1 << 30;
+ while (one > op)
+ one >>= 2;
+
+ while (one != 0) {
+ if (op >= res + one) {
+ op -= res + one;
+ res += one << 1;
+ }
+ res >>= 1;
+ one >>= 2;
+ }
+ return res;
+}
+
+/*
+ * Proximity calibration helper function
+ * runs through a collection of data samples,
+ * sets the min, max, mean, and std dev.
+ */
+void taos_prox_calculate(u16 *data, int length, struct prox_stat *statP)
+{
+
+int i;
+int min, max, sum, mean;
+unsigned long stddev;
+int tmp;
+
+ if (length == 0)
+ length = 1;
+
+ sum = 0;
+ min = 0xffff;
+ max = 0;
+ for (i = 0; i < length; i++) {
+ sum += data[i];
+ if (data[i] < min)
+ min = data[i];
+ if (data[i] > max)
+ max = data[i];
+ }
+ mean = sum/length;
+ statP->min = min;
+ statP->max = max;
+ statP->mean = mean;
+
+ sum = 0;
+ for (i = 0; i < length; i++) {
+ tmp = data[i]-mean;
+ sum += tmp * tmp;
+ }
+ stddev = taos_isqrt((long)sum)/length;
+ statP->stddev = stddev;
+
+}
+
+/*
+ * Proximity calibration - collects a number of samples,
+ * calculates a standard deviation based on the samples,
+ * and sets the threshold accordingly.
+ */
+void taos_prox_cal(struct i2c_client *client)
+{
+u16 prox_history[MAX_SAMPLES_CAL+1];
+int i;
+struct prox_stat prox_stat_data[2];
+struct prox_stat *calP;
+struct tsl2671_chip *chip = i2c_get_clientdata(client);
+u8 tmp_irq_settings;
+
+ if (chip->taos_settings.prox_max_samples_cal > MAX_SAMPLES_CAL) {
+ dev_err(&client->dev,
+ "max prox samples cal is too big: %d\n",
+ chip->taos_settings.prox_max_samples_cal);
+ chip->taos_settings.prox_max_samples_cal = MAX_SAMPLES_CAL;
+ }
+
+ /* have to stop to change settings */
+ taos_chip_off(chip->client);
+
+ /* Enable proximity detection save just in case prox not wanted yet*/
+ tmp_irq_settings = chip->taos_settings.interrupt;
+ chip->taos_settings.interrupt |= CNTL_PROX_INT_ENBL;
+
+ /*turn on device if not already on*/
+ taos_chip_on(chip->client);
+
+ /*gather the samples*/
+ for (i = 0; i < chip->taos_settings.prox_max_samples_cal; i++) {
+ mdelay(15);
+ taos_prox_poll(chip->client);
+ prox_history[i] = chip->prox_cur_info.prox_data;
+ dev_info(&client->dev, "2 i=%d prox data= %d\n",
+ i, chip->prox_cur_info.prox_data);
+
+ }
+
+ taos_chip_off(chip->client);
+
+ calP = &prox_stat_data[PROX_STAT_CAL];
+ taos_prox_calculate(prox_history,
+ chip->taos_settings.prox_max_samples_cal, calP);
+ chip->taos_settings.prox_thres = (calP->max << 1) - calP->mean;
+
+ dev_info(&client->dev, " cal min=%d mean=%d max=%d\n",
+ calP->min, calP->mean, calP->max);
+ dev_info(&client->dev,
+ "TAOS: proximity threshold set to %d, basic mode\n",
+ chip->taos_settings.prox_thres);
+
+ /* back to the way they were */
+ chip->taos_settings.interrupt = tmp_irq_settings;
+}
+
+/* ---------- Sysfs Interface Functions ------------- */
+
+static ssize_t taos_device_id(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct tsl2671_chip *chip = indio_dev->dev_data;
+
+ return sprintf(buf, "%s\n", chip->client->name);
+}
+
+static ssize_t taos_power_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct tsl2671_chip *chip = indio_dev->dev_data;
+
+ return sprintf(buf, "%d\n", chip->taos_chip_status);
+}
+
+static ssize_t taos_power_state_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct tsl2671_chip *chip = indio_dev->dev_data;
+ unsigned long value;
+
+ if (strict_strtoul(buf, 0, &value))
+ return -EINVAL;
+
+ if (value == 0)
+ taos_chip_off(chip->client);
+ else
+ taos_chip_on(chip->client);
+
+ return len;
+}
+
+
+static ssize_t taos_prox_interrupt_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct tsl2671_chip *chip = indio_dev->dev_data;
+ if (chip->taos_settings.interrupt & 0x20)
+ return sprintf(buf, "%d\n", 1);
+ else
+ return sprintf(buf, "%d\n", 0);
+}
+
+static ssize_t taos_prox_interrupt_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct tsl2671_chip *chip = indio_dev->dev_data;
+ unsigned long value;
+
+ if (strict_strtoul(buf, 0, &value))
+ return -EINVAL;
+
+ if (value > 1)
+ return -EINVAL;
+ if (value)
+ chip->taos_settings.interrupt |= 0x20;
+ else
+ chip->taos_settings.interrupt &= 0x10;
+
+ return len;
+}
+
+static ssize_t taos_prox_thresh_high_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct tsl2671_chip *chip = indio_dev->dev_data;
+
+ return sprintf(buf, "%d\n", chip->taos_settings.prox_thres);
+}
+
+static ssize_t taos_prox_thresh_high_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct tsl2671_chip *chip = indio_dev->dev_data;
+ unsigned long value;
+
+ if (strict_strtoul(buf, 0, &value))
+ return -EINVAL;
+
+ chip->taos_settings.prox_thres = value;
+
+ return len;
+}
+
+/* sampling_frequency AKA persistence in data sheet */
+static ssize_t taos_persistence_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct tsl2671_chip *chip = indio_dev->dev_data;
+
+ return sprintf(buf, "0x%02X\n", chip->taos_settings.persistence);
+}
+
+static ssize_t taos_persistence_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct tsl2671_chip *chip = indio_dev->dev_data;
+ unsigned long value;
+
+ if (strict_strtoul(buf, 0, &value))
+ return -EINVAL;
+
+ chip->taos_settings.persistence = value;
+
+ return len;
+}
+
+static ssize_t taos_persistence_available_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "0x0. - 0xF. (0 - 240)\n");
+}
+
+static ssize_t taos_do_prox_calibrate(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct tsl2671_chip *chip = indio_dev->dev_data;
+ unsigned long value;
+
+ if (strict_strtoul(buf, 0, &value))
+ return -EINVAL;
+
+ if (value == 1)
+ taos_prox_cal(chip->client);
+
+ return len;
+}
+
+static DEVICE_ATTR(name, S_IRUGO, taos_device_id, NULL);
+static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR,
+ taos_power_state_show, taos_power_state_store);
+
+static DEVICE_ATTR(proximity_calibrate, S_IWUSR, NULL, taos_do_prox_calibrate);
+
+static DEVICE_ATTR(sampling_frequency, S_IRUGO | S_IWUSR,
+ taos_persistence_show, taos_persistence_store);
+
+static DEVICE_ATTR(sampling_frequency_available, S_IRUGO,
+ taos_persistence_available_show, NULL);
+
+static DEVICE_ATTR(proximity_thresh_value, S_IRUGO | S_IWUSR,
+ taos_prox_thresh_high_show, taos_prox_thresh_high_store);
+
+static struct attribute *sysfs_attrs_ctrl[] = {
+ &dev_attr_name.attr,
+ &dev_attr_power_state.attr,
+ &dev_attr_sampling_frequency.attr, /* persist*/
+ &dev_attr_sampling_frequency_available.attr,
+ &dev_attr_proximity_thresh_value.attr, /*Prox thresh */
+ &dev_attr_proximity_calibrate.attr,
+ NULL
+};
+
+static struct attribute_group tsl2671_attribute_group = {
+ .attrs = sysfs_attrs_ctrl,
+};
+
+/*
+ * Run-time interrupt handler - this handler queues up
+ * the bottom-half tasklet, to handle all valid interrupts.
+ */
+static int taos_interrupt_th(struct iio_dev *dev_info,
+ int index,
+ s64 timestamp,
+ int not_test)
+{
+ struct tsl2671_chip *chip = dev_info->dev_data;
+
+ schedule_work(&chip->work_thresh);
+ return 0;
+}
+
+IIO_EVENT_SH(threshold, &taos_interrupt_th);
+
+IIO_EVENT_ATTR_SH(proximity_thresh_en,
+ iio_event_threshold,
+ taos_prox_interrupt_show,
+ taos_prox_interrupt_store,
+ STA_PRXINTR);
+
+static struct attribute *tsl2671_event_attributes[] = {
+ &iio_event_attr_proximity_thresh_en.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group tsl2671_event_attribute_group = {
+ .attrs = tsl2671_event_attributes,
+};
+
+/* Use the default register values to identify the Taos device */
+static int taos_TSL2671_device(unsigned char *bufp)
+{
+ return ((bufp[TSL2671_CHIPID] & 0xf0) == 0x00);
+}
+
+/*
+ * Client probe function - When a valid device is found, the driver's device
+ * data structure is updated, and initialization completes successfully.
+ */
+static int __devinit taos_probe(struct i2c_client *clientp,
+ const struct i2c_device_id *idp)
+{
+ int i, ret = 0;
+ unsigned char buf[TSL2671_MAX_DEVICE_REGS];
+ static struct tsl2671_chip *chip;
+
+ if (!i2c_check_functionality(clientp->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA)) {
+ dev_err(&clientp->dev,
+ "taos_probe() - i2c smbus byte data "
+ "functions unsupported\n");
+ return -EOPNOTSUPP;
+ }
+
+ chip = kzalloc(sizeof(struct tsl2671_chip), GFP_KERNEL);
+
+ chip->client = clientp;
+ i2c_set_clientdata(clientp, chip);
+
+ mutex_init(&chip->prox_mutex);
+
+ chip->taos_chip_status = TSL2671_CHIP_UNKNOWN;
+ memcpy(chip->taos_config, tsl2671_taos_config,
+ sizeof(chip->taos_config));
+
+ for (i = 0; i < TSL2671_MAX_DEVICE_REGS; i++) {
+ ret = i2c_smbus_write_byte(clientp,
+ (TSL2671_CMD_REG | (TSL2671_CNTRL + i)));
+ if (ret < 0) {
+ dev_err(&clientp->dev, "i2c_smbus_write_bytes() to cmd "
+ "reg failed in taos_probe(), err = %d\n", ret);
+ goto fail1;
+ }
+ ret = i2c_smbus_read_byte(clientp);
+ if (ret < 0) {
+ dev_err(&clientp->dev, "i2c_smbus_read_byte from "
+ "reg failed in taos_probe(), err = %d\n", ret);
+
+ goto fail1;
+ }
+ buf[i] = ret;
+ }
+
+ if (!taos_TSL2671_device(buf)) {
+ dev_info(&clientp->dev, "i2c device found but does not match "
+ "expected id in taos_probe()\n");
+ goto fail1;
+ }
+
+ ret = i2c_smbus_write_byte(clientp, (TSL2671_CMD_REG | TSL2671_CNTRL));
+ if (ret < 0) {
+ dev_err(&clientp->dev, "i2c_smbus_write_byte() to cmd reg "
+ "failed in taos_probe(), err = %d\n", ret);
+ goto fail1;
+ }
+
+ chip->iio_dev = iio_allocate_device();
+ if (!chip->iio_dev)
+ goto fail1;
+
+ chip->iio_dev->attrs = &tsl2671_attribute_group;
+ chip->iio_dev->dev.parent = &clientp->dev;
+ chip->iio_dev->dev_data = (void *)(chip);
+ chip->iio_dev->num_interrupt_lines = 1;
+ chip->iio_dev->event_attrs = &tsl2671_event_attribute_group;
+ chip->iio_dev->driver_module = THIS_MODULE;
+ chip->iio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = iio_device_register(chip->iio_dev);
+ if (ret)
+ goto fail1;
+
+ if (chip->irq_no) {
+ ret = iio_register_interrupt_line(chip->irq_no,
+ chip->iio_dev,
+ 0,
+ IRQF_TRIGGER_FALLING,
+ "tsl2671");
+ if (ret)
+ goto fail1;
+
+ iio_add_event_to_list(&iio_event_threshold,
+ &chip->iio_dev->interrupts[0]->ev_list);
+ }
+
+ /* Load up the defaults
+ * (these are can be changed in the device[x]/ABI) */
+ taos_defaults(chip);
+
+ /* Assume board info already established
+ chip->irq_no = IRQ_EINT4;
+ */
+
+ INIT_WORK(&chip->work_thresh, taos_interrupt_bh);
+
+ /* Make sure the chip is on */
+ taos_chip_on(clientp);
+
+ dev_info(&clientp->dev, "Light sensor found.\n");
+
+ return 0;
+
+fail1:
+ kfree(chip);
+
+ return ret;
+}
+
+static int taos_suspend(struct i2c_client *client, pm_message_t state)
+{
+ struct tsl2671_chip *chip = i2c_get_clientdata(client);
+ int ret = 0;
+
+ mutex_lock(&chip->prox_mutex);
+
+ if (chip->taos_chip_status == TSL2671_CHIP_WORKING) {
+ ret = taos_chip_off(client);
+ chip->taos_chip_status = TSL2671_CHIP_SUSPENDED;
+ }
+
+ mutex_unlock(&chip->prox_mutex);
+ return ret;
+}
+
+static int taos_resume(struct i2c_client *client)
+{
+ struct tsl2671_chip *chip = i2c_get_clientdata(client);
+ int ret = 0;
+
+ mutex_lock(&chip->prox_mutex);
+
+ if (chip->taos_chip_status == TSL2671_CHIP_SUSPENDED)
+ ret = taos_chip_on(client);
+
+ mutex_unlock(&chip->prox_mutex);
+ return ret;
+}
+
+
+static int __devexit taos_remove(struct i2c_client *client)
+{
+ struct tsl2671_chip *chip = i2c_get_clientdata(client);
+
+ taos_chip_off(client);
+
+ if (chip->irq_no)
+ free_irq(chip->irq_no, chip->client->name);
+
+ flush_scheduled_work();
+
+ iio_device_unregister(chip->iio_dev);
+
+ kfree(chip);
+ return 0;
+}
+
+static struct i2c_device_id taos_idtable[] = {
+ { "tsl2671", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, taos_idtable);
+
+/* Driver definition */
+static struct i2c_driver taos_driver = {
+ .driver = {
+ .name = "tsl2671",
+ },
+ .id_table = taos_idtable,
+ .suspend = taos_suspend,
+ .resume = taos_resume,
+ .probe = taos_probe,
+ .remove = __devexit_p(taos_remove),
+};
+
+static int __init taos_init(void)
+{
+ return i2c_add_driver(&taos_driver);
+}
+
+static void __exit taos_exit(void)
+{
+ i2c_del_driver(&taos_driver);
+}
+
+module_init(taos_init);
+module_exit(taos_exit);
+
+MODULE_AUTHOR("J. August Brenner<jbrenner@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("TAOS tsl2671 proximity sensor driver");
+MODULE_LICENSE("GPL");
+
--
1.7.0.4

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