linux/drivers/misc/bh1770glc.c
Dan Carpenter aec0428890 drivers/misc/bh1770glc.c: error handling in bh1770_power_state_store()
There was a signedness bug so "ret" was never less than zero and that
breaks the error handling.  Also in the original code it would overwrite
ret and the result is still negative but it's bogus number instead of the
correct error code.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-12 07:55:31 -08:00

1417 lines
38 KiB
C

/*
* This file is part of the ROHM BH1770GLC / OSRAM SFH7770 sensor driver.
* Chip is combined proximity and ambient light sensor.
*
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
*
* Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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 St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/i2c/bh1770glc.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/slab.h>
#define BH1770_ALS_CONTROL 0x80 /* ALS operation mode control */
#define BH1770_PS_CONTROL 0x81 /* PS operation mode control */
#define BH1770_I_LED 0x82 /* active LED and LED1, LED2 current */
#define BH1770_I_LED3 0x83 /* LED3 current setting */
#define BH1770_ALS_PS_MEAS 0x84 /* Forced mode trigger */
#define BH1770_PS_MEAS_RATE 0x85 /* PS meas. rate at stand alone mode */
#define BH1770_ALS_MEAS_RATE 0x86 /* ALS meas. rate at stand alone mode */
#define BH1770_PART_ID 0x8a /* Part number and revision ID */
#define BH1770_MANUFACT_ID 0x8b /* Manufacturerer ID */
#define BH1770_ALS_DATA_0 0x8c /* ALS DATA low byte */
#define BH1770_ALS_DATA_1 0x8d /* ALS DATA high byte */
#define BH1770_ALS_PS_STATUS 0x8e /* Measurement data and int status */
#define BH1770_PS_DATA_LED1 0x8f /* PS data from LED1 */
#define BH1770_PS_DATA_LED2 0x90 /* PS data from LED2 */
#define BH1770_PS_DATA_LED3 0x91 /* PS data from LED3 */
#define BH1770_INTERRUPT 0x92 /* Interrupt setting */
#define BH1770_PS_TH_LED1 0x93 /* PS interrupt threshold for LED1 */
#define BH1770_PS_TH_LED2 0x94 /* PS interrupt threshold for LED2 */
#define BH1770_PS_TH_LED3 0x95 /* PS interrupt threshold for LED3 */
#define BH1770_ALS_TH_UP_0 0x96 /* ALS upper threshold low byte */
#define BH1770_ALS_TH_UP_1 0x97 /* ALS upper threshold high byte */
#define BH1770_ALS_TH_LOW_0 0x98 /* ALS lower threshold low byte */
#define BH1770_ALS_TH_LOW_1 0x99 /* ALS lower threshold high byte */
/* MANUFACT_ID */
#define BH1770_MANUFACT_ROHM 0x01
#define BH1770_MANUFACT_OSRAM 0x03
/* PART_ID */
#define BH1770_PART 0x90
#define BH1770_PART_MASK 0xf0
#define BH1770_REV_MASK 0x0f
#define BH1770_REV_SHIFT 0
#define BH1770_REV_0 0x00
#define BH1770_REV_1 0x01
/* Operating modes for both */
#define BH1770_STANDBY 0x00
#define BH1770_FORCED 0x02
#define BH1770_STANDALONE 0x03
#define BH1770_SWRESET (0x01 << 2)
#define BH1770_PS_TRIG_MEAS (1 << 0)
#define BH1770_ALS_TRIG_MEAS (1 << 1)
/* Interrupt control */
#define BH1770_INT_OUTPUT_MODE (1 << 3) /* 0 = latched */
#define BH1770_INT_POLARITY (1 << 2) /* 1 = active high */
#define BH1770_INT_ALS_ENA (1 << 1)
#define BH1770_INT_PS_ENA (1 << 0)
/* Interrupt status */
#define BH1770_INT_LED1_DATA (1 << 0)
#define BH1770_INT_LED1_INT (1 << 1)
#define BH1770_INT_LED2_DATA (1 << 2)
#define BH1770_INT_LED2_INT (1 << 3)
#define BH1770_INT_LED3_DATA (1 << 4)
#define BH1770_INT_LED3_INT (1 << 5)
#define BH1770_INT_LEDS_INT ((1 << 1) | (1 << 3) | (1 << 5))
#define BH1770_INT_ALS_DATA (1 << 6)
#define BH1770_INT_ALS_INT (1 << 7)
/* Led channels */
#define BH1770_LED1 0x00
#define BH1770_DISABLE 0
#define BH1770_ENABLE 1
#define BH1770_PROX_CHANNELS 1
#define BH1770_LUX_DEFAULT_RATE 1 /* Index to lux rate table */
#define BH1770_PROX_DEFAULT_RATE 1 /* Direct HW value =~ 50Hz */
#define BH1770_PROX_DEF_RATE_THRESH 6 /* Direct HW value =~ 5 Hz */
#define BH1770_STARTUP_DELAY 50
#define BH1770_RESET_TIME 10
#define BH1770_TIMEOUT 2100 /* Timeout in 2.1 seconds */
#define BH1770_LUX_RANGE 65535
#define BH1770_PROX_RANGE 255
#define BH1770_COEF_SCALER 1024
#define BH1770_CALIB_SCALER 8192
#define BH1770_LUX_NEUTRAL_CALIB_VALUE (1 * BH1770_CALIB_SCALER)
#define BH1770_LUX_DEF_THRES 1000
#define BH1770_PROX_DEF_THRES 70
#define BH1770_PROX_DEF_ABS_THRES 100
#define BH1770_DEFAULT_PERSISTENCE 10
#define BH1770_PROX_MAX_PERSISTENCE 50
#define BH1770_LUX_GA_SCALE 16384
#define BH1770_LUX_CF_SCALE 2048 /* CF ChipFactor */
#define BH1770_NEUTRAL_CF BH1770_LUX_CF_SCALE
#define BH1770_LUX_CORR_SCALE 4096
#define PROX_ABOVE_THRESHOLD 1
#define PROX_BELOW_THRESHOLD 0
#define PROX_IGNORE_LUX_LIMIT 500
struct bh1770_chip {
struct bh1770_platform_data *pdata;
char chipname[10];
u8 revision;
struct i2c_client *client;
struct regulator_bulk_data regs[2];
struct mutex mutex; /* avoid parallel access */
wait_queue_head_t wait;
bool int_mode_prox;
bool int_mode_lux;
struct delayed_work prox_work;
u32 lux_cf; /* Chip specific factor */
u32 lux_ga;
u32 lux_calib;
int lux_rate_index;
u32 lux_corr;
u16 lux_data_raw;
u16 lux_threshold_hi;
u16 lux_threshold_lo;
u16 lux_thres_hi_onchip;
u16 lux_thres_lo_onchip;
bool lux_wait_result;
int prox_enable_count;
u16 prox_coef;
u16 prox_const;
int prox_rate;
int prox_rate_threshold;
u8 prox_persistence;
u8 prox_persistence_counter;
u8 prox_data;
u8 prox_threshold;
u8 prox_threshold_hw;
bool prox_force_update;
u8 prox_abs_thres;
u8 prox_led;
};
static const char reg_vcc[] = "Vcc";
static const char reg_vleds[] = "Vleds";
/*
* Supported stand alone rates in ms from chip data sheet
* {10, 20, 30, 40, 70, 100, 200, 500, 1000, 2000};
*/
static const s16 prox_rates_hz[] = {100, 50, 33, 25, 14, 10, 5, 2};
static const s16 prox_rates_ms[] = {10, 20, 30, 40, 70, 100, 200, 500};
/* Supported IR-led currents in mA */
static const u8 prox_curr_ma[] = {5, 10, 20, 50, 100, 150, 200};
/*
* Supported stand alone rates in ms from chip data sheet
* {100, 200, 500, 1000, 2000};
*/
static const s16 lux_rates_hz[] = {10, 5, 2, 1, 0};
/*
* interrupt control functions are called while keeping chip->mutex
* excluding module probe / remove
*/
static inline int bh1770_lux_interrupt_control(struct bh1770_chip *chip,
int lux)
{
chip->int_mode_lux = lux;
/* Set interrupt modes, interrupt active low, latched */
return i2c_smbus_write_byte_data(chip->client,
BH1770_INTERRUPT,
(lux << 1) | chip->int_mode_prox);
}
static inline int bh1770_prox_interrupt_control(struct bh1770_chip *chip,
int ps)
{
chip->int_mode_prox = ps;
return i2c_smbus_write_byte_data(chip->client,
BH1770_INTERRUPT,
(chip->int_mode_lux << 1) | (ps << 0));
}
/* chip->mutex is always kept here */
static int bh1770_lux_rate(struct bh1770_chip *chip, int rate_index)
{
/* sysfs may call this when the chip is powered off */
if (pm_runtime_suspended(&chip->client->dev))
return 0;
/* Proper proximity response needs fastest lux rate (100ms) */
if (chip->prox_enable_count)
rate_index = 0;
return i2c_smbus_write_byte_data(chip->client,
BH1770_ALS_MEAS_RATE,
rate_index);
}
static int bh1770_prox_rate(struct bh1770_chip *chip, int mode)
{
int rate;
rate = (mode == PROX_ABOVE_THRESHOLD) ?
chip->prox_rate_threshold : chip->prox_rate;
return i2c_smbus_write_byte_data(chip->client,
BH1770_PS_MEAS_RATE,
rate);
}
/* InfraredLED is controlled by the chip during proximity scanning */
static inline int bh1770_led_cfg(struct bh1770_chip *chip)
{
/* LED cfg, current for leds 1 and 2 */
return i2c_smbus_write_byte_data(chip->client,
BH1770_I_LED,
(BH1770_LED1 << 6) |
(BH1770_LED_5mA << 3) |
chip->prox_led);
}
/*
* Following two functions converts raw ps values from HW to normalized
* values. Purpose is to compensate differences between different sensor
* versions and variants so that result means about the same between
* versions.
*/
static inline u8 bh1770_psraw_to_adjusted(struct bh1770_chip *chip, u8 psraw)
{
u16 adjusted;
adjusted = (u16)(((u32)(psraw + chip->prox_const) * chip->prox_coef) /
BH1770_COEF_SCALER);
if (adjusted > BH1770_PROX_RANGE)
adjusted = BH1770_PROX_RANGE;
return adjusted;
}
static inline u8 bh1770_psadjusted_to_raw(struct bh1770_chip *chip, u8 ps)
{
u16 raw;
raw = (((u32)ps * BH1770_COEF_SCALER) / chip->prox_coef);
if (raw > chip->prox_const)
raw = raw - chip->prox_const;
else
raw = 0;
return raw;
}
/*
* Following two functions converts raw lux values from HW to normalized
* values. Purpose is to compensate differences between different sensor
* versions and variants so that result means about the same between
* versions. Chip->mutex is kept when this is called.
*/
static int bh1770_prox_set_threshold(struct bh1770_chip *chip)
{
u8 tmp = 0;
/* sysfs may call this when the chip is powered off */
if (pm_runtime_suspended(&chip->client->dev))
return 0;
tmp = bh1770_psadjusted_to_raw(chip, chip->prox_threshold);
chip->prox_threshold_hw = tmp;
return i2c_smbus_write_byte_data(chip->client, BH1770_PS_TH_LED1,
tmp);
}
static inline u16 bh1770_lux_raw_to_adjusted(struct bh1770_chip *chip, u16 raw)
{
u32 lux;
lux = ((u32)raw * chip->lux_corr) / BH1770_LUX_CORR_SCALE;
return min(lux, (u32)BH1770_LUX_RANGE);
}
static inline u16 bh1770_lux_adjusted_to_raw(struct bh1770_chip *chip,
u16 adjusted)
{
return (u32)adjusted * BH1770_LUX_CORR_SCALE / chip->lux_corr;
}
/* chip->mutex is kept when this is called */
static int bh1770_lux_update_thresholds(struct bh1770_chip *chip,
u16 threshold_hi, u16 threshold_lo)
{
u8 data[4];
int ret;
/* sysfs may call this when the chip is powered off */
if (pm_runtime_suspended(&chip->client->dev))
return 0;
/*
* Compensate threshold values with the correction factors if not
* set to minimum or maximum.
* Min & max values disables interrupts.
*/
if (threshold_hi != BH1770_LUX_RANGE && threshold_hi != 0)
threshold_hi = bh1770_lux_adjusted_to_raw(chip, threshold_hi);
if (threshold_lo != BH1770_LUX_RANGE && threshold_lo != 0)
threshold_lo = bh1770_lux_adjusted_to_raw(chip, threshold_lo);
if (chip->lux_thres_hi_onchip == threshold_hi &&
chip->lux_thres_lo_onchip == threshold_lo)
return 0;
chip->lux_thres_hi_onchip = threshold_hi;
chip->lux_thres_lo_onchip = threshold_lo;
data[0] = threshold_hi;
data[1] = threshold_hi >> 8;
data[2] = threshold_lo;
data[3] = threshold_lo >> 8;
ret = i2c_smbus_write_i2c_block_data(chip->client,
BH1770_ALS_TH_UP_0,
ARRAY_SIZE(data),
data);
return ret;
}
static int bh1770_lux_get_result(struct bh1770_chip *chip)
{
u16 data;
int ret;
ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_0);
if (ret < 0)
return ret;
data = ret & 0xff;
ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_1);
if (ret < 0)
return ret;
chip->lux_data_raw = data | ((ret & 0xff) << 8);
return 0;
}
/* Calculate correction value which contains chip and device specific parts */
static u32 bh1770_get_corr_value(struct bh1770_chip *chip)
{
u32 tmp;
/* Impact of glass attenuation correction */
tmp = (BH1770_LUX_CORR_SCALE * chip->lux_ga) / BH1770_LUX_GA_SCALE;
/* Impact of chip factor correction */
tmp = (tmp * chip->lux_cf) / BH1770_LUX_CF_SCALE;
/* Impact of Device specific calibration correction */
tmp = (tmp * chip->lux_calib) / BH1770_CALIB_SCALER;
return tmp;
}
static int bh1770_lux_read_result(struct bh1770_chip *chip)
{
bh1770_lux_get_result(chip);
return bh1770_lux_raw_to_adjusted(chip, chip->lux_data_raw);
}
/*
* Chip on / off functions are called while keeping mutex except probe
* or remove phase
*/
static int bh1770_chip_on(struct bh1770_chip *chip)
{
int ret = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
chip->regs);
if (ret < 0)
return ret;
usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
/* Reset the chip */
i2c_smbus_write_byte_data(chip->client, BH1770_ALS_CONTROL,
BH1770_SWRESET);
usleep_range(BH1770_RESET_TIME, BH1770_RESET_TIME * 2);
/*
* ALS is started always since proximity needs als results
* for realibility estimation.
* Let's assume dark until the first ALS measurement is ready.
*/
chip->lux_data_raw = 0;
chip->prox_data = 0;
ret = i2c_smbus_write_byte_data(chip->client,
BH1770_ALS_CONTROL, BH1770_STANDALONE);
/* Assume reset defaults */
chip->lux_thres_hi_onchip = BH1770_LUX_RANGE;
chip->lux_thres_lo_onchip = 0;
return ret;
}
static void bh1770_chip_off(struct bh1770_chip *chip)
{
i2c_smbus_write_byte_data(chip->client,
BH1770_INTERRUPT, BH1770_DISABLE);
i2c_smbus_write_byte_data(chip->client,
BH1770_ALS_CONTROL, BH1770_STANDBY);
i2c_smbus_write_byte_data(chip->client,
BH1770_PS_CONTROL, BH1770_STANDBY);
regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
}
/* chip->mutex is kept when this is called */
static int bh1770_prox_mode_control(struct bh1770_chip *chip)
{
if (chip->prox_enable_count) {
chip->prox_force_update = true; /* Force immediate update */
bh1770_lux_rate(chip, chip->lux_rate_index);
bh1770_prox_set_threshold(chip);
bh1770_led_cfg(chip);
bh1770_prox_rate(chip, PROX_BELOW_THRESHOLD);
bh1770_prox_interrupt_control(chip, BH1770_ENABLE);
i2c_smbus_write_byte_data(chip->client,
BH1770_PS_CONTROL, BH1770_STANDALONE);
} else {
chip->prox_data = 0;
bh1770_lux_rate(chip, chip->lux_rate_index);
bh1770_prox_interrupt_control(chip, BH1770_DISABLE);
i2c_smbus_write_byte_data(chip->client,
BH1770_PS_CONTROL, BH1770_STANDBY);
}
return 0;
}
/* chip->mutex is kept when this is called */
static int bh1770_prox_read_result(struct bh1770_chip *chip)
{
int ret;
bool above;
u8 mode;
ret = i2c_smbus_read_byte_data(chip->client, BH1770_PS_DATA_LED1);
if (ret < 0)
goto out;
if (ret > chip->prox_threshold_hw)
above = true;
else
above = false;
/*
* when ALS levels goes above limit, proximity result may be
* false proximity. Thus ignore the result. With real proximity
* there is a shadow causing low als levels.
*/
if (chip->lux_data_raw > PROX_IGNORE_LUX_LIMIT)
ret = 0;
chip->prox_data = bh1770_psraw_to_adjusted(chip, ret);
/* Strong proximity level or force mode requires immediate response */
if (chip->prox_data >= chip->prox_abs_thres ||
chip->prox_force_update)
chip->prox_persistence_counter = chip->prox_persistence;
chip->prox_force_update = false;
/* Persistence filttering to reduce false proximity events */
if (likely(above)) {
if (chip->prox_persistence_counter < chip->prox_persistence) {
chip->prox_persistence_counter++;
ret = -ENODATA;
} else {
mode = PROX_ABOVE_THRESHOLD;
ret = 0;
}
} else {
chip->prox_persistence_counter = 0;
mode = PROX_BELOW_THRESHOLD;
chip->prox_data = 0;
ret = 0;
}
/* Set proximity detection rate based on above or below value */
if (ret == 0) {
bh1770_prox_rate(chip, mode);
sysfs_notify(&chip->client->dev.kobj, NULL, "prox0_raw");
}
out:
return ret;
}
static int bh1770_detect(struct bh1770_chip *chip)
{
struct i2c_client *client = chip->client;
s32 ret;
u8 manu, part;
ret = i2c_smbus_read_byte_data(client, BH1770_MANUFACT_ID);
if (ret < 0)
goto error;
manu = (u8)ret;
ret = i2c_smbus_read_byte_data(client, BH1770_PART_ID);
if (ret < 0)
goto error;
part = (u8)ret;
chip->revision = (part & BH1770_REV_MASK) >> BH1770_REV_SHIFT;
chip->prox_coef = BH1770_COEF_SCALER;
chip->prox_const = 0;
chip->lux_cf = BH1770_NEUTRAL_CF;
if ((manu == BH1770_MANUFACT_ROHM) &&
((part & BH1770_PART_MASK) == BH1770_PART)) {
snprintf(chip->chipname, sizeof(chip->chipname), "BH1770GLC");
return 0;
}
if ((manu == BH1770_MANUFACT_OSRAM) &&
((part & BH1770_PART_MASK) == BH1770_PART)) {
snprintf(chip->chipname, sizeof(chip->chipname), "SFH7770");
/* Values selected by comparing different versions */
chip->prox_coef = 819; /* 0.8 * BH1770_COEF_SCALER */
chip->prox_const = 40;
return 0;
}
ret = -ENODEV;
error:
dev_dbg(&client->dev, "BH1770 or SFH7770 not found\n");
return ret;
}
/*
* This work is re-scheduled at every proximity interrupt.
* If this work is running, it means that there hasn't been any
* proximity interrupt in time. Situation is handled as no-proximity.
* It would be nice to have low-threshold interrupt or interrupt
* when measurement and hi-threshold are both 0. But neither of those exists.
* This is a workaroud for missing HW feature.
*/
static void bh1770_prox_work(struct work_struct *work)
{
struct bh1770_chip *chip =
container_of(work, struct bh1770_chip, prox_work.work);
mutex_lock(&chip->mutex);
bh1770_prox_read_result(chip);
mutex_unlock(&chip->mutex);
}
/* This is threaded irq handler */
static irqreturn_t bh1770_irq(int irq, void *data)
{
struct bh1770_chip *chip = data;
int status;
int rate = 0;
mutex_lock(&chip->mutex);
status = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_PS_STATUS);
/* Acknowledge interrupt by reading this register */
i2c_smbus_read_byte_data(chip->client, BH1770_INTERRUPT);
/*
* Check if there is fresh data available for als.
* If this is the very first data, update thresholds after that.
*/
if (status & BH1770_INT_ALS_DATA) {
bh1770_lux_get_result(chip);
if (unlikely(chip->lux_wait_result)) {
chip->lux_wait_result = false;
wake_up(&chip->wait);
bh1770_lux_update_thresholds(chip,
chip->lux_threshold_hi,
chip->lux_threshold_lo);
}
}
/* Disable interrupt logic to guarantee acknowledgement */
i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
(0 << 1) | (0 << 0));
if ((status & BH1770_INT_ALS_INT))
sysfs_notify(&chip->client->dev.kobj, NULL, "lux0_input");
if (chip->int_mode_prox && (status & BH1770_INT_LEDS_INT)) {
rate = prox_rates_ms[chip->prox_rate_threshold];
bh1770_prox_read_result(chip);
}
/* Re-enable interrupt logic */
i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
(chip->int_mode_lux << 1) |
(chip->int_mode_prox << 0));
mutex_unlock(&chip->mutex);
/*
* Can't cancel work while keeping mutex since the work uses the
* same mutex.
*/
if (rate) {
/*
* Simulate missing no-proximity interrupt 50ms after the
* next expected interrupt time.
*/
cancel_delayed_work_sync(&chip->prox_work);
schedule_delayed_work(&chip->prox_work,
msecs_to_jiffies(rate + 50));
}
return IRQ_HANDLED;
}
static ssize_t bh1770_power_state_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
unsigned long value;
ssize_t ret;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
mutex_lock(&chip->mutex);
if (value) {
pm_runtime_get_sync(dev);
ret = bh1770_lux_rate(chip, chip->lux_rate_index);
if (ret < 0) {
pm_runtime_put(dev);
goto leave;
}
ret = bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
if (ret < 0) {
pm_runtime_put(dev);
goto leave;
}
/* This causes interrupt after the next measurement cycle */
bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
BH1770_LUX_DEF_THRES);
/* Inform that we are waiting for a result from ALS */
chip->lux_wait_result = true;
bh1770_prox_mode_control(chip);
} else if (!pm_runtime_suspended(dev)) {
pm_runtime_put(dev);
}
ret = count;
leave:
mutex_unlock(&chip->mutex);
return ret;
}
static ssize_t bh1770_power_state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", !pm_runtime_suspended(dev));
}
static ssize_t bh1770_lux_result_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
ssize_t ret;
long timeout;
if (pm_runtime_suspended(dev))
return -EIO; /* Chip is not enabled at all */
timeout = wait_event_interruptible_timeout(chip->wait,
!chip->lux_wait_result,
msecs_to_jiffies(BH1770_TIMEOUT));
if (!timeout)
return -EIO;
mutex_lock(&chip->mutex);
ret = sprintf(buf, "%d\n", bh1770_lux_read_result(chip));
mutex_unlock(&chip->mutex);
return ret;
}
static ssize_t bh1770_lux_range_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", BH1770_LUX_RANGE);
}
static ssize_t bh1770_prox_enable_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
mutex_lock(&chip->mutex);
/* Assume no proximity. Sensor will tell real state soon */
if (!chip->prox_enable_count)
chip->prox_data = 0;
if (value)
chip->prox_enable_count++;
else if (chip->prox_enable_count > 0)
chip->prox_enable_count--;
else
goto leave;
/* Run control only when chip is powered on */
if (!pm_runtime_suspended(dev))
bh1770_prox_mode_control(chip);
leave:
mutex_unlock(&chip->mutex);
return count;
}
static ssize_t bh1770_prox_enable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
ssize_t len;
mutex_lock(&chip->mutex);
len = sprintf(buf, "%d\n", chip->prox_enable_count);
mutex_unlock(&chip->mutex);
return len;
}
static ssize_t bh1770_prox_result_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
ssize_t ret;
mutex_lock(&chip->mutex);
if (chip->prox_enable_count && !pm_runtime_suspended(dev))
ret = sprintf(buf, "%d\n", chip->prox_data);
else
ret = -EIO;
mutex_unlock(&chip->mutex);
return ret;
}
static ssize_t bh1770_prox_range_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", BH1770_PROX_RANGE);
}
static ssize_t bh1770_get_prox_rate_avail(struct device *dev,
struct device_attribute *attr, char *buf)
{
int i;
int pos = 0;
for (i = 0; i < ARRAY_SIZE(prox_rates_hz); i++)
pos += sprintf(buf + pos, "%d ", prox_rates_hz[i]);
sprintf(buf + pos - 1, "\n");
return pos;
}
static ssize_t bh1770_get_prox_rate_above(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate_threshold]);
}
static ssize_t bh1770_get_prox_rate_below(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate]);
}
static int bh1770_prox_rate_validate(int rate)
{
int i;
for (i = 0; i < ARRAY_SIZE(prox_rates_hz) - 1; i++)
if (rate >= prox_rates_hz[i])
break;
return i;
}
static ssize_t bh1770_set_prox_rate_above(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
mutex_lock(&chip->mutex);
chip->prox_rate_threshold = bh1770_prox_rate_validate(value);
mutex_unlock(&chip->mutex);
return count;
}
static ssize_t bh1770_set_prox_rate_below(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
mutex_lock(&chip->mutex);
chip->prox_rate = bh1770_prox_rate_validate(value);
mutex_unlock(&chip->mutex);
return count;
}
static ssize_t bh1770_get_prox_thres(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", chip->prox_threshold);
}
static ssize_t bh1770_set_prox_thres(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
unsigned long value;
int ret;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if (value > BH1770_PROX_RANGE)
return -EINVAL;
mutex_lock(&chip->mutex);
chip->prox_threshold = value;
ret = bh1770_prox_set_threshold(chip);
mutex_unlock(&chip->mutex);
if (ret < 0)
return ret;
return count;
}
static ssize_t bh1770_prox_persistence_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", chip->prox_persistence);
}
static ssize_t bh1770_prox_persistence_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if (value > BH1770_PROX_MAX_PERSISTENCE)
return -EINVAL;
chip->prox_persistence = value;
return len;
}
static ssize_t bh1770_prox_abs_thres_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", chip->prox_abs_thres);
}
static ssize_t bh1770_prox_abs_thres_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
unsigned long value;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
if (value > BH1770_PROX_RANGE)
return -EINVAL;
chip->prox_abs_thres = value;
return len;
}
static ssize_t bh1770_chip_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
return sprintf(buf, "%s rev %d\n", chip->chipname, chip->revision);
}
static ssize_t bh1770_lux_calib_default_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%u\n", BH1770_CALIB_SCALER);
}
static ssize_t bh1770_lux_calib_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
ssize_t len;
mutex_lock(&chip->mutex);
len = sprintf(buf, "%u\n", chip->lux_calib);
mutex_unlock(&chip->mutex);
return len;
}
static ssize_t bh1770_lux_calib_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
unsigned long value;
u32 old_calib;
u32 new_corr;
if (strict_strtoul(buf, 0, &value))
return -EINVAL;
mutex_lock(&chip->mutex);
old_calib = chip->lux_calib;
chip->lux_calib = value;
new_corr = bh1770_get_corr_value(chip);
if (new_corr == 0) {
chip->lux_calib = old_calib;
mutex_unlock(&chip->mutex);
return -EINVAL;
}
chip->lux_corr = new_corr;
/* Refresh thresholds on HW after changing correction value */
bh1770_lux_update_thresholds(chip, chip->lux_threshold_hi,
chip->lux_threshold_lo);
mutex_unlock(&chip->mutex);
return len;
}
static ssize_t bh1770_get_lux_rate_avail(struct device *dev,
struct device_attribute *attr, char *buf)
{
int i;
int pos = 0;
for (i = 0; i < ARRAY_SIZE(lux_rates_hz); i++)
pos += sprintf(buf + pos, "%d ", lux_rates_hz[i]);
sprintf(buf + pos - 1, "\n");
return pos;
}
static ssize_t bh1770_get_lux_rate(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", lux_rates_hz[chip->lux_rate_index]);
}
static ssize_t bh1770_set_lux_rate(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
unsigned long rate_hz;
int ret, i;
if (strict_strtoul(buf, 0, &rate_hz))
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(lux_rates_hz) - 1; i++)
if (rate_hz >= lux_rates_hz[i])
break;
mutex_lock(&chip->mutex);
chip->lux_rate_index = i;
ret = bh1770_lux_rate(chip, i);
mutex_unlock(&chip->mutex);
if (ret < 0)
return ret;
return count;
}
static ssize_t bh1770_get_lux_thresh_above(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", chip->lux_threshold_hi);
}
static ssize_t bh1770_get_lux_thresh_below(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", chip->lux_threshold_lo);
}
static ssize_t bh1770_set_lux_thresh(struct bh1770_chip *chip, u16 *target,
const char *buf)
{
int ret = 0;
unsigned long thresh;
if (strict_strtoul(buf, 0, &thresh))
return -EINVAL;
if (thresh > BH1770_LUX_RANGE)
return -EINVAL;
mutex_lock(&chip->mutex);
*target = thresh;
/*
* Don't update values in HW if we are still waiting for
* first interrupt to come after device handle open call.
*/
if (!chip->lux_wait_result)
ret = bh1770_lux_update_thresholds(chip,
chip->lux_threshold_hi,
chip->lux_threshold_lo);
mutex_unlock(&chip->mutex);
return ret;
}
static ssize_t bh1770_set_lux_thresh_above(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_hi, buf);
if (ret < 0)
return ret;
return len;
}
static ssize_t bh1770_set_lux_thresh_below(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct bh1770_chip *chip = dev_get_drvdata(dev);
int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_lo, buf);
if (ret < 0)
return ret;
return len;
}
static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, bh1770_prox_enable_show,
bh1770_prox_enable_store);
static DEVICE_ATTR(prox0_thresh_above1_value, S_IRUGO | S_IWUSR,
bh1770_prox_abs_thres_show,
bh1770_prox_abs_thres_store);
static DEVICE_ATTR(prox0_thresh_above0_value, S_IRUGO | S_IWUSR,
bh1770_get_prox_thres,
bh1770_set_prox_thres);
static DEVICE_ATTR(prox0_raw, S_IRUGO, bh1770_prox_result_show, NULL);
static DEVICE_ATTR(prox0_sensor_range, S_IRUGO, bh1770_prox_range_show, NULL);
static DEVICE_ATTR(prox0_thresh_above_count, S_IRUGO | S_IWUSR,
bh1770_prox_persistence_show,
bh1770_prox_persistence_store);
static DEVICE_ATTR(prox0_rate_above, S_IRUGO | S_IWUSR,
bh1770_get_prox_rate_above,
bh1770_set_prox_rate_above);
static DEVICE_ATTR(prox0_rate_below, S_IRUGO | S_IWUSR,
bh1770_get_prox_rate_below,
bh1770_set_prox_rate_below);
static DEVICE_ATTR(prox0_rate_avail, S_IRUGO, bh1770_get_prox_rate_avail, NULL);
static DEVICE_ATTR(lux0_calibscale, S_IRUGO | S_IWUSR, bh1770_lux_calib_show,
bh1770_lux_calib_store);
static DEVICE_ATTR(lux0_calibscale_default, S_IRUGO,
bh1770_lux_calib_default_show,
NULL);
static DEVICE_ATTR(lux0_input, S_IRUGO, bh1770_lux_result_show, NULL);
static DEVICE_ATTR(lux0_sensor_range, S_IRUGO, bh1770_lux_range_show, NULL);
static DEVICE_ATTR(lux0_rate, S_IRUGO | S_IWUSR, bh1770_get_lux_rate,
bh1770_set_lux_rate);
static DEVICE_ATTR(lux0_rate_avail, S_IRUGO, bh1770_get_lux_rate_avail, NULL);
static DEVICE_ATTR(lux0_thresh_above_value, S_IRUGO | S_IWUSR,
bh1770_get_lux_thresh_above,
bh1770_set_lux_thresh_above);
static DEVICE_ATTR(lux0_thresh_below_value, S_IRUGO | S_IWUSR,
bh1770_get_lux_thresh_below,
bh1770_set_lux_thresh_below);
static DEVICE_ATTR(chip_id, S_IRUGO, bh1770_chip_id_show, NULL);
static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, bh1770_power_state_show,
bh1770_power_state_store);
static struct attribute *sysfs_attrs[] = {
&dev_attr_lux0_calibscale.attr,
&dev_attr_lux0_calibscale_default.attr,
&dev_attr_lux0_input.attr,
&dev_attr_lux0_sensor_range.attr,
&dev_attr_lux0_rate.attr,
&dev_attr_lux0_rate_avail.attr,
&dev_attr_lux0_thresh_above_value.attr,
&dev_attr_lux0_thresh_below_value.attr,
&dev_attr_prox0_raw.attr,
&dev_attr_prox0_sensor_range.attr,
&dev_attr_prox0_raw_en.attr,
&dev_attr_prox0_thresh_above_count.attr,
&dev_attr_prox0_rate_above.attr,
&dev_attr_prox0_rate_below.attr,
&dev_attr_prox0_rate_avail.attr,
&dev_attr_prox0_thresh_above0_value.attr,
&dev_attr_prox0_thresh_above1_value.attr,
&dev_attr_chip_id.attr,
&dev_attr_power_state.attr,
NULL
};
static struct attribute_group bh1770_attribute_group = {
.attrs = sysfs_attrs
};
static int __devinit bh1770_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct bh1770_chip *chip;
int err;
chip = kzalloc(sizeof *chip, GFP_KERNEL);
if (!chip)
return -ENOMEM;
i2c_set_clientdata(client, chip);
chip->client = client;
mutex_init(&chip->mutex);
init_waitqueue_head(&chip->wait);
INIT_DELAYED_WORK(&chip->prox_work, bh1770_prox_work);
if (client->dev.platform_data == NULL) {
dev_err(&client->dev, "platform data is mandatory\n");
err = -EINVAL;
goto fail1;
}
chip->pdata = client->dev.platform_data;
chip->lux_calib = BH1770_LUX_NEUTRAL_CALIB_VALUE;
chip->lux_rate_index = BH1770_LUX_DEFAULT_RATE;
chip->lux_threshold_lo = BH1770_LUX_DEF_THRES;
chip->lux_threshold_hi = BH1770_LUX_DEF_THRES;
if (chip->pdata->glass_attenuation == 0)
chip->lux_ga = BH1770_NEUTRAL_GA;
else
chip->lux_ga = chip->pdata->glass_attenuation;
chip->prox_threshold = BH1770_PROX_DEF_THRES;
chip->prox_led = chip->pdata->led_def_curr;
chip->prox_abs_thres = BH1770_PROX_DEF_ABS_THRES;
chip->prox_persistence = BH1770_DEFAULT_PERSISTENCE;
chip->prox_rate_threshold = BH1770_PROX_DEF_RATE_THRESH;
chip->prox_rate = BH1770_PROX_DEFAULT_RATE;
chip->prox_data = 0;
chip->regs[0].supply = reg_vcc;
chip->regs[1].supply = reg_vleds;
err = regulator_bulk_get(&client->dev,
ARRAY_SIZE(chip->regs), chip->regs);
if (err < 0) {
dev_err(&client->dev, "Cannot get regulators\n");
goto fail1;
}
err = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
chip->regs);
if (err < 0) {
dev_err(&client->dev, "Cannot enable regulators\n");
goto fail2;
}
usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
err = bh1770_detect(chip);
if (err < 0)
goto fail3;
/* Start chip */
bh1770_chip_on(chip);
pm_runtime_set_active(&client->dev);
pm_runtime_enable(&client->dev);
chip->lux_corr = bh1770_get_corr_value(chip);
if (chip->lux_corr == 0) {
dev_err(&client->dev, "Improper correction values\n");
err = -EINVAL;
goto fail3;
}
if (chip->pdata->setup_resources) {
err = chip->pdata->setup_resources();
if (err) {
err = -EINVAL;
goto fail3;
}
}
err = sysfs_create_group(&chip->client->dev.kobj,
&bh1770_attribute_group);
if (err < 0) {
dev_err(&chip->client->dev, "Sysfs registration failed\n");
goto fail4;
}
/*
* Chip needs level triggered interrupt to work. However,
* level triggering doesn't work always correctly with power
* management. Select both
*/
err = request_threaded_irq(client->irq, NULL,
bh1770_irq,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
IRQF_TRIGGER_LOW,
"bh1770", chip);
if (err) {
dev_err(&client->dev, "could not get IRQ %d\n",
client->irq);
goto fail5;
}
regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
return err;
fail5:
sysfs_remove_group(&chip->client->dev.kobj,
&bh1770_attribute_group);
fail4:
if (chip->pdata->release_resources)
chip->pdata->release_resources();
fail3:
regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
fail2:
regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
fail1:
kfree(chip);
return err;
}
static int __devexit bh1770_remove(struct i2c_client *client)
{
struct bh1770_chip *chip = i2c_get_clientdata(client);
free_irq(client->irq, chip);
sysfs_remove_group(&chip->client->dev.kobj,
&bh1770_attribute_group);
if (chip->pdata->release_resources)
chip->pdata->release_resources();
cancel_delayed_work_sync(&chip->prox_work);
if (!pm_runtime_suspended(&client->dev))
bh1770_chip_off(chip);
pm_runtime_disable(&client->dev);
pm_runtime_set_suspended(&client->dev);
regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
kfree(chip);
return 0;
}
#ifdef CONFIG_PM
static int bh1770_suspend(struct device *dev)
{
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct bh1770_chip *chip = i2c_get_clientdata(client);
bh1770_chip_off(chip);
return 0;
}
static int bh1770_resume(struct device *dev)
{
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct bh1770_chip *chip = i2c_get_clientdata(client);
int ret = 0;
bh1770_chip_on(chip);
if (!pm_runtime_suspended(dev)) {
/*
* If we were enabled at suspend time, it is expected
* everything works nice and smoothly
*/
ret = bh1770_lux_rate(chip, chip->lux_rate_index);
ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
/* This causes interrupt after the next measurement cycle */
bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
BH1770_LUX_DEF_THRES);
/* Inform that we are waiting for a result from ALS */
chip->lux_wait_result = true;
bh1770_prox_mode_control(chip);
}
return ret;
}
#else
#define bh1770_suspend NULL
#define bh1770_shutdown NULL
#define bh1770_resume NULL
#endif
#ifdef CONFIG_PM_RUNTIME
static int bh1770_runtime_suspend(struct device *dev)
{
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct bh1770_chip *chip = i2c_get_clientdata(client);
bh1770_chip_off(chip);
return 0;
}
static int bh1770_runtime_resume(struct device *dev)
{
struct i2c_client *client = container_of(dev, struct i2c_client, dev);
struct bh1770_chip *chip = i2c_get_clientdata(client);
bh1770_chip_on(chip);
return 0;
}
#endif
static const struct i2c_device_id bh1770_id[] = {
{"bh1770glc", 0 },
{"sfh7770", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, bh1770_id);
static const struct dev_pm_ops bh1770_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(bh1770_suspend, bh1770_resume)
SET_RUNTIME_PM_OPS(bh1770_runtime_suspend, bh1770_runtime_resume, NULL)
};
static struct i2c_driver bh1770_driver = {
.driver = {
.name = "bh1770glc",
.owner = THIS_MODULE,
.pm = &bh1770_pm_ops,
},
.probe = bh1770_probe,
.remove = __devexit_p(bh1770_remove),
.id_table = bh1770_id,
};
static int __init bh1770_init(void)
{
return i2c_add_driver(&bh1770_driver);
}
static void __exit bh1770_exit(void)
{
i2c_del_driver(&bh1770_driver);
}
MODULE_DESCRIPTION("BH1770GLC / SFH7770 combined ALS and proximity sensor");
MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
MODULE_LICENSE("GPL v2");
module_init(bh1770_init);
module_exit(bh1770_exit);