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Date: Fri, 16 Apr 2010 09:24:39 +0300
From: Onkalo Samu <samu.p.onkalo@...ia.com>
To: ext Jonathan Cameron <jic23@....ac.uk>
Cc: "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] misc: bh1770glc: Driver for bh1770glc combined als
and ps sensor
Thanks for review and comments.
On Thu, 2010-04-15 at 14:14 +0200, ext Jonathan Cameron wrote:
> On 04/15/10 11:34, Samu Onkalo wrote:
> > Driver for combined ambient light and proximity sensor.
> > BH1770GLC and SW compatible SFH7770 sensors are supported.
>
> Any chance of a data sheet? Google isn't trivially providing
> me with one!
I'm sorry, but I cannot promise data sheet right now.
> Looks pretty good and I'm afraid this is a bit of a quick and dirty
> review for now.
>
> Most of the comments below are to do with clarifying the sysfs
> interface. Quite a lot of the files do not seem to have one
> 'conceptual' value per file. A lot of them need documentataion
> as well.
>
I'll add some documentation under Documentation/misc-devices.
It makes sense to modify sysfs interface to one value per file.
> Some of my points may be due to misunderstanding what the device
> is doing, but perhaps they will hint where additional documentation
> is needed.
Chip consist of two separate analog measurement paths. One for IR light
and one for clear light. IR part is driving up to 3 IR leds. IR
measurement part measures reflection from each of the IR led. IR leds
are driver using short pulses and measurement is synchronized to the
pulses.
Both analog paths shares same digital control part. They share same
interrupt logic and I2C bus. Part of registers are common for both and
part of the registers are dedicated to PS or ALS.
> >
> > Signed-off-by: Samu Onkalo <samu.p.onkalo@...ia.com>
> > ---
> > drivers/misc/Kconfig | 12 +
> > drivers/misc/Makefile | 3 +
> > drivers/misc/bh1770glc.h | 169 ++++++++++++
> > drivers/misc/bh1770glc_als.c | 424 +++++++++++++++++++++++++++++
> > drivers/misc/bh1770glc_core.c | 301 +++++++++++++++++++++
> > drivers/misc/bh1770glc_ps.c | 585 +++++++++++++++++++++++++++++++++++++++++
> > include/linux/bh1770glc.h | 39 +++
> > 7 files changed, 1533 insertions(+), 0 deletions(-)
> > create mode 100644 drivers/misc/bh1770glc.h
> > create mode 100644 drivers/misc/bh1770glc_als.c
> > create mode 100644 drivers/misc/bh1770glc_core.c
> > create mode 100644 drivers/misc/bh1770glc_ps.c
> > create mode 100644 include/linux/bh1770glc.h
> >
> > diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> > index 2191c8d..4594703 100644
> > --- a/drivers/misc/Kconfig
> > +++ b/drivers/misc/Kconfig
> > @@ -311,6 +311,18 @@ config TI_DAC7512
> > This driver can also be built as a module. If so, the module
> > will be calles ti_dac7512.
> >
> > +config BH1770GLC
> > + tristate "Rohm BH1770GLC ambient light and proximity sensor"
> > + depends on I2C
> > + default n
> > + ---help---
> > + Say Y here if you want to build a driver for BH1770GLC
> > + combined ambient light and proximity sensor chip.
> > + Driver supports also Osram SFH7770 version of the chip.
> > +
> > + To compile this driver as a module, choose M here: the
> > + module will be called bh1770glc. If unsure, say N here.
> > +
> > source "drivers/misc/c2port/Kconfig"
> > source "drivers/misc/eeprom/Kconfig"
> > source "drivers/misc/cb710/Kconfig"
> > diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
> > index 27c4843..5201667 100644
> > --- a/drivers/misc/Makefile
> > +++ b/drivers/misc/Makefile
> > @@ -2,6 +2,8 @@
> > # Makefile for misc devices that really don't fit anywhere else.
> > #
> >
> > +bh1770glc-objs := bh1770glc_core.o bh1770glc_als.o bh1770glc_ps.o
> > +
> I wonder if ideally this chip wouldn't be an mfd with two child devices?
> That would allow people using only one or other function to pick and choose
> which modules are loaded?
>
> I'm guessing that would be a fair bit of work and can be left for a future
> date!
mfd could make sense. I need to check this.
> > obj-$(CONFIG_IBM_ASM) += ibmasm/
> > obj-$(CONFIG_HDPU_FEATURES) += hdpuftrs/
> > obj-$(CONFIG_AD525X_DPOT) += ad525x_dpot.o
> > @@ -25,6 +27,7 @@ obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o
> > obj-$(CONFIG_EP93XX_PWM) += ep93xx_pwm.o
> > obj-$(CONFIG_DS1682) += ds1682.o
> > obj-$(CONFIG_TI_DAC7512) += ti_dac7512.o
> > +obj-$(CONFIG_BH1770GLC) += bh1770glc.o
> > obj-$(CONFIG_C2PORT) += c2port/
> > obj-$(CONFIG_IWMC3200TOP) += iwmc3200top/
> > obj-y += eeprom/
> > diff --git a/drivers/misc/bh1770glc.h b/drivers/misc/bh1770glc.h
> > new file mode 100644
> > index 0000000..096777e
> > --- /dev/null
> > +++ b/drivers/misc/bh1770glc.h
> > @@ -0,0 +1,169 @@
> > +/*
> > + * 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@...ia.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
> > + *
> > + */
> > +
> > +#ifndef __BH1770GLC_HEADER__
> > +#define __BH1770GLC_HEADER__
> > +
> > +#define BHCHIP_ALS_CONTROL 0x80 /* ALS operation mode control */
> > +#define BHCHIP_PS_CONTROL 0x81 /* PS operation mode control */
> > +#define BHCHIP_I_LED 0x82 /* active LED and LED1, LED2 current */
> > +#define BHCHIP_I_LED3 0x83 /* LED3 current setting */
> > +#define BHCHIP_ALS_PS_MEAS 0x84 /* Forced mode trigger */
> > +#define BHCHIP_PS_MEAS_RATE 0x85 /* PS meas. rate at stand alone mode */
> > +#define BHCHIP_ALS_MEAS_RATE 0x86 /* ALS meas. rate at stand alone mode */
> > +#define BHCHIP_PART_ID 0x8a /* Part number and revision ID */
> > +#define BHCHIP_MANUFACT_ID 0x8b /* Manufacturerer ID */
> > +#define BHCHIP_ALS_DATA_0 0x8c /* ALS DATA low byte */
> > +#define BHCHIP_ALS_DATA_1 0x8d /* ALS DATA high byte */
> > +#define BHCHIP_ALS_PS_STATUS 0x8e /* Measurement data and int status */
> > +#define BHCHIP_PS_DATA_LED1 0x8f /* PS data from LED1 */
> > +#define BHCHIP_PS_DATA_LED2 0x90 /* PS data from LED2 */
> > +#define BHCHIP_PS_DATA_LED3 0x91 /* PS data from LED3 */
> > +#define BHCHIP_INTERRUPT 0x92 /* Interrupt setting */
> > +#define BHCHIP_PS_TH_LED1 0x93 /* PS interrupt threshold for LED1 */
> > +#define BHCHIP_PS_TH_LED2 0x94 /* PS interrupt threshold for LED2 */
> > +#define BHCHIP_PS_TH_LED3 0x95 /* PS interrupt threshold for LED3 */
> > +#define BHCHIP_ALS_TH_UP_0 0x96 /* ALS upper threshold low byte */
> > +#define BHCHIP_ALS_TH_UP_1 0x97 /* ALS upper threshold high byte */
> > +#define BHCHIP_ALS_TH_LOW_0 0x98 /* ALS lower threshold low byte */
> > +#define BHCHIP_ALS_TH_LOW_1 0x99 /* ALS lower threshold high byte */
> > +
> > +/* MANUFACT_ID */
> > +#define BHCHIP_MANUFACT_ROHM 0x01
> > +#define BHCHIP_MANUFACT_OSRAM 0x03
> > +
> > +/* PART_ID */
> > +#define BHCHIP_PART 0x90
> > +#define BHCHIP_PART_MASK 0xf0
> > +#define BHCHIP_REV_MASK 0x0f
> > +#define BHCHIP_REV_SHIFT 0
> > +#define BHCHIP_REV_0 0x00
> > +
> > +/* Operating modes for both */
> > +#define BHCHIP_STANDBY 0x00
> > +#define BHCHIP_FORCED 0x02
> > +#define BHCHIP_STANDALONE 0x03
> > +
> > +#define BHCHIP_PS_TRIG_MEAS (1 << 0)
> > +#define BHCHIP_ALS_TRIG_MEAS (1 << 1)
> > +
> > +/* Interrupt control */
> > +#define BHCHIP_INT_OUTPUT_MODE (1 << 3) /* 0 = latched */
> > +#define BHCHIP_INT_POLARITY (1 << 2) /* 1 = active high */
> > +#define BHCHIP_INT_ALS_ENA (1 << 1)
> > +#define BHCHIP_INT_PS_ENA (1 << 0)
> > +
> > +/* Interrupt status */
> > +#define BHCHIP_INT_LED1_DATA (1 << 0)
> > +#define BHCHIP_INT_LED1_INT (1 << 1)
> > +#define BHCHIP_INT_LED2_DATA (1 << 2)
> > +#define BHCHIP_INT_LED2_INT (1 << 3)
> > +#define BHCHIP_INT_LED3_DATA (1 << 4)
> > +#define BHCHIP_INT_LED3_INT (1 << 5)
> > +#define BHCHIP_INT_LEDS_INT ((1 << 1) | (1 << 3) | (1 << 5))
> > +#define BHCHIP_INT_ALS_DATA (1 << 6)
> > +#define BHCHIP_INT_ALS_INT (1 << 7)
> > +
> > +#define BHCHIP_DISABLE 0
> > +#define BHCHIP_ENABLE 1
> > +
> > + /* Following are milliseconds */
> > +#define BHCHIP_ALS_DEFAULT_RATE 200
> > +#define BHCHIP_PS_DEFAULT_RATE 40
> > +#define BHCHIP_PS_DEF_RATE_THRESH 200
> > +#define BHCHIP_PS_INIT_DELAY 15
> > +#define BHCHIP_STARTUP_DELAY 50
> > +
> > +#define BHCHIP_ALS_RANGE 65535
> > +#define BHCHIP_PS_RANGE 255
> > +#define BHCHIP_CALIB_SCALER 1000
> > +#define BHCHIP_ALS_NEUTRAL_CALIB_VALUE (1 * BHCHIP_CALIB_SCALER)
> > +#define BHCHIP_PS_NEUTRAL_CALIB_VALUE (1 * BHCHIP_CALIB_SCALER)
> > +#define BHCHIP_ALS_DEF_SENS 10
> > +#define BHCHIP_ALS_DEF_THRES 1000
> > +#define BHCHIP_PS_DEF_THRES 20
> > +
> > +#define ALS_NBR_FORMAT 512
> > +/* coef as decimal = ALS_COEF / *(ALS_NBR_FORMAT ^ 2) */
> > +#define ALS_COEF 1536
> > +/* Scaler coefficient at zero level */
> > +#define ALS_ZERO_LEVEL (ALS_NBR_FORMAT / 4)
> > +
> > +#define PS_ABOVE_THRESHOLD 1
> > +#define PS_BELOW_THRESHOLD 0
> > +
> > +#define BHCHIP_PS_CHANNELS 3
> > +
> > +struct bh1770glc_chip {
> > + struct i2c_client *client;
> > + struct bh1770glc_platform_data *pdata;
> > + struct mutex mutex; /* avoid parallel access */
> > + struct regulator_bulk_data regs[2];
> > +
> > + bool int_mode_ps;
> > + bool int_mode_als;
> > +
> > + wait_queue_head_t als_misc_wait; /* WQ for ALS part */
> > + wait_queue_head_t ps_misc_wait; /* WQ for PS part */
> > + struct delayed_work ps_work; /* For ps low threshold */
> > +
> > + char chipname[10];
> > + u8 revision;
> > +
> > + u32 als_calib;
> > + int als_rate;
> > + int als_mode;
> > + int als_users;
> > + u16 als_data;
> > + u16 als_threshold_hi;
> > + u16 als_threshold_lo;
> > + u16 als_sens;
> > + loff_t als_offset;
> > +
> > + loff_t ps_offset;
> > + u32 ps_calib[BHCHIP_PS_CHANNELS];
> > + int ps_rate;
> > + int ps_rate_threshold;
> > + int ps_mode;
> > + int ps_users;
> > + u8 ps_data[BHCHIP_PS_CHANNELS];
> > + u8 ps_thresholds[BHCHIP_PS_CHANNELS];
> > + u8 ps_leds[BHCHIP_PS_CHANNELS];
> > + u8 ps_channels; /* nbr of leds */
> > +};
> I'm probably half asleep, but what is the benefit in defining these
> as extern.
> > +
> > +extern struct bh1770glc_chip *bh1770glc;
> > +
> > +extern int bh1770glc_ps_mode(struct bh1770glc_chip *chip, int mode);
> > +extern int bh1770glc_ps_init(struct bh1770glc_chip *chip);
> > +extern int bh1770glc_ps_destroy(struct bh1770glc_chip *chip);
> > +extern void bh1770glc_ps_interrupt_handler(struct bh1770glc_chip *chip,
> > + int status);
> > +
> > +extern int bh1770glc_als_mode(struct bh1770glc_chip *chip, int mode);
> > +extern int bh1770glc_als_init(struct bh1770glc_chip *chip);
> > +extern int bh1770glc_als_destroy(struct bh1770glc_chip *chip);
> > +extern void bh1770glc_als_interrupt_handler(struct bh1770glc_chip *chip,
> > + int status);
> > +#endif
> > diff --git a/drivers/misc/bh1770glc_als.c b/drivers/misc/bh1770glc_als.c
> > new file mode 100644
> > index 0000000..81f41c6
> > --- /dev/null
> > +++ b/drivers/misc/bh1770glc_als.c
> > @@ -0,0 +1,424 @@
> > +/*
> > + * 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@...ia.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/i2c.h>
> > +#include <linux/mutex.h>
> > +#include <linux/miscdevice.h>
> > +#include <linux/poll.h>
> > +#include <linux/bh1770glc.h>
> > +#include <linux/uaccess.h>
> > +#include <linux/delay.h>
> > +#include <linux/regulator/consumer.h>
> > +#include "bh1770glc.h"
> > +
> > +/* Supported stand alone rates in ms from chip data sheet */
> > +static s16 als_rates[] = {100, 200, 500, 1000, 2000};
> I'd like to see these rates made apparent to userspace somewhere.
> Probably via sysfs. There are a couple of conventions for this
> in use through the kernel. The recent LWN article touched on this.
>
> The same is true of modes. If nothing else that certainly needs some
> documentation!
True
> > +
> > +/* chip->mutex must be locked during this function */
> > +static int bh1770glc_als_interrupt_control(struct bh1770glc_chip *chip,
> > + int als)
> > +{
> > + chip->int_mode_als = als;
> > +
> > + /* Set ALS interrupt mode, interrupt active low, latched */
> > + return i2c_smbus_write_byte_data(chip->client,
> > + BHCHIP_INTERRUPT,
> > + (als << 1) | (chip->int_mode_ps << 0));
> > +}
> > +
> > +int bh1770glc_als_mode(struct bh1770glc_chip *chip, int mode)
> > +{
> > + int r;
> > +
> > + r = i2c_smbus_write_byte_data(chip->client, BHCHIP_ALS_CONTROL, mode);
> > +
> > + if (r == 0)
> > + chip->als_mode = mode;
> > +
> > + return r;
> > +}
> > +
> > +static int bh1770glc_als_rate(struct bh1770glc_chip *chip, int rate)
> > +{
> > + int ret = -EINVAL;
> > + int i;
> > +
> > + for (i = 0; i < ARRAY_SIZE(als_rates); i++)
> > + if (als_rates[i] == rate) {
> > + ret = i2c_smbus_write_byte_data(chip->client,
> > + BHCHIP_ALS_MEAS_RATE,
> > + i);
> > + if (ret == 0)
> > + chip->als_rate = rate;
> > + break;
> > + }
> > + return ret;
> > +}
> > +
> > +static int bh1770glc_als_set_threshold(struct bh1770glc_chip *chip,
> > + int threshold_hi,
> > + int threshold_lo)
> > +{
> > + u8 data[4];
> > + int ret;
> > +
> > + chip->als_threshold_hi = threshold_hi;
> > + chip->als_threshold_lo = 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,
> > + BHCHIP_ALS_TH_UP_0,
> > + ARRAY_SIZE(data),
> > + data);
> > + return ret;
> > +}
> > +
> > +static int bh1770glc_als_calc_thresholds(struct bh1770glc_chip *chip, u16 data)
> > +{
> > + int scaler;
> > + int hi_thres;
> > + int lo_thres;
> > + int sens;
> > + int ret;
> > +
> > + /*
> > + * Recalculate new threshold limits to simulate delta measurement
> > + * mode. New limits are relative to latest measurement data.
> > + */
> > + scaler = ((int)data * ALS_COEF) / ALS_NBR_FORMAT + ALS_ZERO_LEVEL;
> > + sens = chip->als_sens * scaler / ALS_NBR_FORMAT;
> > +
> > + hi_thres = min(data + sens, BHCHIP_ALS_RANGE);
> > + lo_thres = max(data - sens, 0);
> > +
> > + mutex_lock(&chip->mutex);
> > + ret = bh1770glc_als_set_threshold(chip,
> > + hi_thres,
> > + lo_thres);
> > + mutex_unlock(&chip->mutex);
> > +
> > + return ret;
> > +}
> > +
> > +static int bh1770glc_als_read_result(struct bh1770glc_chip *chip)
> > +{
> > + u16 data;
> > + int ret;
> > +
> > + ret = i2c_smbus_read_byte_data(chip->client, BHCHIP_ALS_DATA_0);
> > + if (ret < 0)
> > + goto exit;
> > +
> > + data = ret & 0xff;
> > + ret = i2c_smbus_read_byte_data(chip->client, BHCHIP_ALS_DATA_1);
> > + if (ret < 0)
> > + goto exit;
> > +
> > + data = data | ((ret & 0xff) << 8);
> > + chip->als_data = data;
> > + chip->als_offset += sizeof(struct bh1770glc_als);
> > +
> > + ret = bh1770glc_als_calc_thresholds(chip, data);
> > +exit:
> > + return ret;
> > +}
> > +
> > +void bh1770glc_als_interrupt_handler(struct bh1770glc_chip *chip, int status)
> > +{
> > + if (chip->int_mode_als)
> > + if (status & BHCHIP_INT_ALS_INT) {
> > + bh1770glc_als_read_result(chip);
> > + wake_up_interruptible(&bh1770glc->als_misc_wait);
> > + }
> > +}
> > +
> > +static ssize_t bh1770glc_als_read(struct file *file, char __user *buf,
> > + size_t count, loff_t *offset)
> > +{
> > + struct bh1770glc_als als;
> > + struct bh1770glc_chip *chip = bh1770glc;
> > + u32 lux;
> > +
> > + if (count < sizeof(als))
> > + return -EINVAL;
> > +
> > + if (*offset >= chip->als_offset) {
> > + if (file->f_flags & O_NONBLOCK)
> > + return -EAGAIN;
> > + if (wait_event_interruptible(bh1770glc->als_misc_wait,
> > + (*offset < chip->als_offset)))
> > + return -ERESTARTSYS;
> > + }
> > + lux = ((u32)chip->als_data * chip->als_calib) /
> > + BHCHIP_CALIB_SCALER;
> > + lux = min(lux, (u32)BHCHIP_ALS_RANGE);
> > +
> > + als.lux = lux;
>
> Given you are storing a copy anyway, would it be possible to make this available
> via sysfs? That would make this als driver look a bit more like the others in tree
> and it doesn't at first glance look that tricky. Also note that it is perfectly
> possible to use polling with sysfs files http://lwn.net/Articles/174660/
Chip operating state is controlled based on /dev/bh* device handle
state. If those are not open, chip is not running. I think that it is
not possible to get information when some sysfs entry is used.
Perhaps every read could start the chip and keeps it running for a
while. So, sysfs based use requires regular polling to keep chip
measuring. Or there should be a way to force chip on (perhaps via mode
entries).
>
> > +
> > + *offset = chip->als_offset;
> > +
> > + return copy_to_user(buf, &als, sizeof(als)) ? -EFAULT : sizeof(als);
> > +}
> > +
> > +static int bh1770glc_als_open(struct inode *inode, struct file *file)
> > +{
> > +
> > + struct bh1770glc_chip *chip = bh1770glc;
> > + int ret = 0;
> > +
> > + mutex_lock(&chip->mutex);
> > + if (!chip->als_users) {
> > + ret = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
> > + chip->regs);
> > + if (ret < 0)
> > + goto release_lock;
> > +
> > + if (!chip->ps_users)
> > + msleep(BHCHIP_STARTUP_DELAY);
> > +
> > + ret = bh1770glc_als_mode(chip, BHCHIP_STANDALONE);
> > + if (ret < 0)
> > + goto exit;
> > +
> > + ret = bh1770glc_als_rate(chip, chip->als_rate);
> > + if (ret < 0)
> > + goto exit;
> > +
> > + ret = bh1770glc_als_interrupt_control(chip, BHCHIP_ENABLE);
> > + if (ret < 0)
> > + goto exit;
> > + }
> > + /* Trig measurement and refresh the measurement result */
>
> This confuses me a little. My reading of this is that it sets up a threshold.
> This doesn't to me imply an measurement being taken?
Chip itself measures all the time when it is enabled. Setting of
thresholds to the same values trigs an interrupt after the next
measurement period. So, this doesn't really trig a measurement, but
requests chip to inform about the new result.
> > + bh1770glc_als_set_threshold(chip, BHCHIP_ALS_DEF_THRES,
> > + BHCHIP_ALS_DEF_THRES);
> > +
> > + if (ret == 0)
> > + chip->als_users++;
>
> Perhaps these labels could be more informative. I'd certainly expect the first
> thing release_lock does to be releasing the lock.
True. Code after the release_lock is added after the selection of the
label name and the label is little bit out of the date.
> > +exit:
> > + if (ret < 0)
> > + regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
> > +release_lock:
> > + file->f_pos = chip->als_offset;
> > + /* In case of two or more user, provide newest results available */
> > + if (chip->als_users > 1 &&
> > + file->f_pos >= sizeof(struct bh1770glc_als))
> > + file->f_pos -= sizeof(struct bh1770glc_als);
> > +
> > + mutex_unlock(&chip->mutex);
> > + return ret;
> > +}
> > +
> > +static unsigned int bh1770glc_als_poll(struct file *file, poll_table *wait)
> > +{
> > + poll_wait(file, &bh1770glc->als_misc_wait, wait);
> > + if (file->f_pos < bh1770glc->als_offset)
> > + return POLLIN | POLLRDNORM;
> > + return 0;
> > +}
> > +
> > +static int bh1770glc_als_close(struct inode *inode, struct file *file)
> > +{
> > + struct bh1770glc_chip *chip = bh1770glc;
> > + mutex_lock(&chip->mutex);
> > + if (!--chip->als_users) {
> > + bh1770glc_als_interrupt_control(chip, BHCHIP_DISABLE);
> > + bh1770glc_als_mode(chip, BHCHIP_STANDBY);
> > + regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
> > + }
> > + mutex_unlock(&chip->mutex);
> > + return 0;
> > +}
> > +
> > +
> > +/* SYSFS interface */
> > +static ssize_t bh1770glc_als_calib_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > +
> > + return snprintf(buf, PAGE_SIZE, "%u\n", chip->als_calib);
> > +}
> > +
> > +static ssize_t bh1770glc_als_calib_store(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t len)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + unsigned long value;
> > +
> > + if (strict_strtoul(buf, 0, &value))
> > + return -EINVAL;
> > +
> > + chip->als_calib = value;
> > +
> > + return len;
> > +}
> > +
> > +static ssize_t bh1770glc_get_als_mode(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + return sprintf(buf, "%d\n", chip->als_mode);
> > +}
> > +
> > +static ssize_t bh1770glc_get_als_rate(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + return sprintf(buf, "%d\n", chip->als_rate);
> > +}
> > +
> > +static ssize_t bh1770glc_set_als_rate(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + unsigned long rate;
> > + int ret;
> > +
> > + if (strict_strtoul(buf, 0, &rate))
> > + return -EINVAL;
> > +
> > + mutex_lock(&chip->mutex);
> > + ret = bh1770glc_als_rate(chip, rate);
> > + mutex_unlock(&chip->mutex);
> > +
> > + if (ret < 0)
> > + return ret;
> > +
> > + return count;
> > +}
> > +
>
> This one definitely needs documentation. It's not remotely obvious what the sensitivity
> numbers correspond to!
I will add to the documentation
> > +static ssize_t bh1770glc_get_als_sens(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + return sprintf(buf, "%d\n", chip->als_sens);
> > +}
> > +
> > +static ssize_t bh1770glc_set_als_sens(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + int ret;
> > + unsigned long sens;
> > +
> > + if (strict_strtoul(buf, 0, &sens))
> > + return -EINVAL;
> > +
> > + chip->als_sens = sens;
> > +
> > + /* Trick measurement by setting default thresholds */
> This could do with more detail? Is it that setting thesholds always
> triggers a measurement and hence an interrupt?
> > + mutex_lock(&chip->mutex);
> > + ret = bh1770glc_als_set_threshold(chip,
> > + BHCHIP_ALS_DEF_THRES,
> > + BHCHIP_ALS_DEF_THRES);
> > +
> > + mutex_unlock(&chip->mutex);
> > + if (ret < 0)
> > + return ret;
> > + return count;
> > +}
> > +
> > +static DEVICE_ATTR(als_calib, S_IRUGO | S_IWUSR, bh1770glc_als_calib_show,
> > + bh1770glc_als_calib_store);
> > +static DEVICE_ATTR(als_mode, S_IRUGO , bh1770glc_get_als_mode, NULL);
> > +static DEVICE_ATTR(als_rate, S_IRUGO | S_IWUSR, bh1770glc_get_als_rate,
> > + bh1770glc_set_als_rate);
> > +static DEVICE_ATTR(als_sens, S_IRUGO | S_IWUSR, bh1770glc_get_als_sens,
> > + bh1770glc_set_als_sens);
> > +
> > +static struct attribute *sysfs_attrs[] = {
> > + &dev_attr_als_calib.attr,
> > + &dev_attr_als_mode.attr,
> > + &dev_attr_als_rate.attr,
> > + &dev_attr_als_sens.attr,
> > + NULL
> > +};
> > +
> > +static struct attribute_group bh1770glc_attribute_group = {
> > + .attrs = sysfs_attrs
> > +};
> > +
> > +static const struct file_operations bh1770glc_als_fops = {
> > + .owner = THIS_MODULE,
> > + .llseek = no_llseek,
> > + .read = bh1770glc_als_read,
> > + .poll = bh1770glc_als_poll,
> > + .open = bh1770glc_als_open,
> > + .release = bh1770glc_als_close,
> > +};
> > +
> > +static struct miscdevice bh1770glc_als_miscdevice = {
> > + .minor = MISC_DYNAMIC_MINOR,
> > + .name = "bh1770glc_als",
> > + .fops = &bh1770glc_als_fops
> > +};
> > +
> > +int bh1770glc_als_init(struct bh1770glc_chip *chip)
> > +{
> > + int err;
> > + err = bh1770glc_als_mode(chip, BHCHIP_STANDBY);
> > + if (err < 0)
> > + goto fail;
> > +
> > + err = bh1770glc_als_interrupt_control(chip, BHCHIP_DISABLE);
> > + if (err < 0)
> > + goto fail;
> > +
> > + chip->als_rate = BHCHIP_ALS_DEFAULT_RATE;
> > +
> > + bh1770glc_als_miscdevice.parent = &chip->client->dev;
> > + err = misc_register(&bh1770glc_als_miscdevice);
> > + if (err < 0) {
> > + dev_err(&chip->client->dev, "Device registration failed\n");
> > + goto fail;
> > + }
> > +
> > + err = sysfs_create_group(&chip->client->dev.kobj,
> > + &bh1770glc_attribute_group);
> > + if (err < 0) {
> > + dev_err(&chip->client->dev, "Sysfs registration failed\n");
> > + goto fail2;
> > + }
> > + return 0;
> > +fail2:
> > + misc_deregister(&bh1770glc_als_miscdevice);
> > +fail:
> > + return err;
> > +}
> > +
> > +int bh1770glc_als_destroy(struct bh1770glc_chip *chip)
> > +{
> > + sysfs_remove_group(&chip->client->dev.kobj,
> > + &bh1770glc_attribute_group);
> > + misc_deregister(&bh1770glc_als_miscdevice);
> > + return 0;
> > +}
> > diff --git a/drivers/misc/bh1770glc_core.c b/drivers/misc/bh1770glc_core.c
> > new file mode 100644
> > index 0000000..36d0443
> > --- /dev/null
> > +++ b/drivers/misc/bh1770glc_core.c
> > @@ -0,0 +1,301 @@
> > +/*
> > + * 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@...ia.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/bh1770glc.h>
> > +#include <linux/regulator/consumer.h>
> > +#include <linux/slab.h>
> > +#include "bh1770glc.h"
> > +
> > +struct bh1770glc_chip *bh1770glc;
> > +
> > +static const char reg_vcc[] = "Vcc";
> > +static const char reg_vleds[] = "Vleds";
> > +
> > +static int bh1770glc_detect(struct bh1770glc_chip *chip)
> > +{
> > + struct i2c_client *client = chip->client;
> > + s32 ret;
> > + u8 manu;
> > + u8 part;
> > +
> > + ret = i2c_smbus_read_byte_data(client, BHCHIP_MANUFACT_ID);
> > + if (ret < 0)
> > + goto error;
> > +
> > + manu = (u8)ret;
> > +
> > + ret = i2c_smbus_read_byte_data(client, BHCHIP_PART_ID);
> > + if (ret < 0)
> > + goto error;
> > + part = (u8)ret;
> > + chip->revision = (part & BHCHIP_REV_MASK) >> BHCHIP_REV_SHIFT;
> > +
> > + if ((manu == BHCHIP_MANUFACT_ROHM) &&
> > + ((part & BHCHIP_PART_MASK) == BHCHIP_PART)) {
> > + snprintf(chip->chipname, sizeof(chip->chipname), "BH1770GLC");
> > + return 0;
> > + }
> > +
> > + if ((manu == BHCHIP_MANUFACT_OSRAM) &&
> > + ((part & BHCHIP_PART_MASK) == BHCHIP_PART)) {
> > + snprintf(chip->chipname, sizeof(chip->chipname), "SFH7770");
> > + return 0;
> > + }
> > +
> > + ret = -ENODEV;
> > +error:
> > + dev_dbg(&client->dev, "BH1770GLC or SFH7770 not found\n");
> > +
> > + return ret;
> > +}
> > +
> > +/* This is threaded irq handler */
> > +static irqreturn_t bh1770glc_irq(int irq, void *data)
> > +{
> > + struct bh1770glc_chip *chip = data;
> > + int status;
> > +
> > + status = i2c_smbus_read_byte_data(chip->client, BHCHIP_ALS_PS_STATUS);
> > +
> > + /* Acknowledge interrupt by reading this register */
> > + i2c_smbus_read_byte_data(chip->client, BHCHIP_INTERRUPT);
> > +
> > + bh1770glc_als_interrupt_handler(chip, status);
> > + bh1770glc_ps_interrupt_handler(chip, status);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static int __devinit bh1770glc_probe(struct i2c_client *client,
> > + const struct i2c_device_id *id)
> > +{
> > + struct bh1770glc_chip *chip;
> > + int err;
> > + int i;
> > +
> > + chip = kzalloc(sizeof *chip, GFP_KERNEL);
> > + if (!chip)
> > + return -ENOMEM;
> > +
> > + bh1770glc = chip;
> > +
> > + init_waitqueue_head(&chip->ps_misc_wait);
> > + init_waitqueue_head(&chip->als_misc_wait);
> > +
> > + i2c_set_clientdata(client, chip);
> > + chip->client = client;
> > +
> > + mutex_init(&chip->mutex);
> > + chip->pdata = client->dev.platform_data;
> > + chip->als_calib = BHCHIP_ALS_NEUTRAL_CALIB_VALUE;
> > + chip->als_sens = BHCHIP_ALS_DEF_SENS;
> > + for (i = 0; i < BHCHIP_PS_CHANNELS; i++)
> > + chip->ps_calib[i] = BHCHIP_PS_NEUTRAL_CALIB_VALUE;
> > +
> > + /*
> > + * Platform data contains led configuration and safety limits.
> > + * Too strong current can damage HW permanently.
> > + * Platform data filled with zeros causes minimum current.
> > + */
> > + if (chip->pdata == NULL) {
> > + dev_err(&client->dev, "platform data is mandatory\n");
> > + err = -EINVAL;
> > + goto fail1;
> > + }
> > +
> > + if (chip->pdata->setup_resources) {
> > + err = chip->pdata->setup_resources();
> > + if (err) {
> > + err = -EINVAL;
> > + goto fail1;
> > + }
> > + }
> > +
> > + switch (chip->pdata->leds) {
> > + case BH1770GLC_LED1:
> > + chip->ps_channels = 1;
> > + break;
> > + case BH1770GLC_LED12:
> > + case BH1770GLC_LED13:
> > + chip->ps_channels = 2;
> > + break;
> > + case BH1770GLC_LED123:
> > + chip->ps_channels = 3;
> > + break;
> > + default:
> > + err = -EINVAL;
> > + goto fail1;
> > + }
> > +
> > + 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;
> > + }
> > +
> > + err = bh1770glc_detect(chip);
> > + if (err < 0)
> > + goto fail3;
> > +
> > + err = bh1770glc_als_init(chip);
> > + if (err < 0)
> > + goto fail3;
> > +
> > + err = bh1770glc_ps_init(chip);
> > + if (err < 0)
> > + goto fail4;
> > +
> > + err = request_threaded_irq(client->irq, NULL,
> > + bh1770glc_irq,
> > + IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
> > + "bh1770glc", 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:
> > + bh1770glc_ps_destroy(chip);
> > +fail4:
> > + bh1770glc_als_destroy(chip);
> > +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 bh1770glc_remove(struct i2c_client *client)
> > +{
> > + struct bh1770glc_chip *chip = i2c_get_clientdata(client);
> > +
> > + free_irq(client->irq, chip);
> > +
> > + if (chip->pdata && chip->pdata->release_resources)
> > + chip->pdata->release_resources();
> > +
> > + bh1770glc_als_destroy(chip);
> > + bh1770glc_ps_destroy(chip);
> > + regulator_bulk_free(ARRAY_SIZE(chip->regs), chip->regs);
> > + kfree(chip);
> > + return 0;
> > +}
> > +
> > +#ifdef CONFIG_PM
> > +static int bh1770glc_suspend(struct i2c_client *client, pm_message_t mesg)
> > +{
> > + struct bh1770glc_chip *chip = i2c_get_clientdata(client);
> > +
> > + mutex_lock(&chip->mutex);
> > + if (chip->als_users)
> > + bh1770glc_als_mode(chip, BHCHIP_STANDBY);
> > + if (chip->ps_users)
> > + bh1770glc_ps_mode(chip, BHCHIP_STANDBY);
> > + mutex_unlock(&chip->mutex);
> > + return 0;
> > +}
> > +
> > +static int bh1770glc_resume(struct i2c_client *client)
> > +{
> > + struct bh1770glc_chip *chip = i2c_get_clientdata(client);
> > +
> > + mutex_lock(&chip->mutex);
> > + if (chip->als_users)
> > + bh1770glc_als_mode(chip, BHCHIP_STANDALONE);
> > + if (chip->ps_users)
> > + bh1770glc_ps_mode(chip, BHCHIP_STANDALONE);
> > + mutex_unlock(&chip->mutex);
> > + return 0;
> > +}
> > +
> > +static void bh1770glc_shutdown(struct i2c_client *client)
> > +{
> > + struct bh1770glc_chip *chip = i2c_get_clientdata(client);
> > +
> > + bh1770glc_als_mode(chip, BHCHIP_STANDBY);
> > + bh1770glc_ps_mode(chip, BHCHIP_STANDBY);
> > +}
> > +
> > +#else
> > +#define bh1770glc_suspend NULL
> > +#define bh1770glc_shutdown NULL
> > +#define bh1770glc_resume NULL
> > +#endif
> > +
> > +static const struct i2c_device_id bh1770glc_id[] = {
> > + {"bh1770glc", 0 },
> I think convention would be to have these both in lower case?
> (might be wrong!)
of course :)
> > + {"SFH7770", 0 },
> > + {}
> > +};
> > +
> > +MODULE_DEVICE_TABLE(i2c, bh1770glc_id);
> > +
> > +static struct i2c_driver bh1770glc_driver = {
> > + .driver = {
> > + .name = "bh1770glc",
> > + .owner = THIS_MODULE,
> > + },
> > + .suspend = bh1770glc_suspend,
> > + .shutdown = bh1770glc_shutdown,
> > + .resume = bh1770glc_resume,
> > + .probe = bh1770glc_probe,
> > + .remove = __devexit_p(bh1770glc_remove),
> > + .id_table = bh1770glc_id,
> > +};
> > +
> > +static int __init bh1770glc_init(void)
> > +{
> > + return i2c_add_driver(&bh1770glc_driver);
> > +}
> > +
> > +static void __exit bh1770glc_exit(void)
> > +{
> > + i2c_del_driver(&bh1770glc_driver);
> > +}
> > +
> > +MODULE_DESCRIPTION("BH1770GLC combined ALS and proximity sensor");
> > +MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
> > +MODULE_LICENSE("GPL v2");
> > +
> > +module_init(bh1770glc_init);
> > +module_exit(bh1770glc_exit);
> > diff --git a/drivers/misc/bh1770glc_ps.c b/drivers/misc/bh1770glc_ps.c
> > new file mode 100644
> > index 0000000..5e68efe
> > --- /dev/null
> > +++ b/drivers/misc/bh1770glc_ps.c
> > @@ -0,0 +1,585 @@
> > +/*
> > + * 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@...ia.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/i2c.h>
> > +#include <linux/mutex.h>
> > +#include <linux/miscdevice.h>
> > +#include <linux/poll.h>
> > +#include <linux/bh1770glc.h>
> > +#include <linux/uaccess.h>
> > +#include <linux/delay.h>
> > +#include <linux/regulator/consumer.h>
> > +#include <linux/workqueue.h>
> > +#include <linux/jiffies.h>
> > +#include "bh1770glc.h"
> > +
>
> Again, can we have these exported to userspace.
> > +/* Supported stand alone rates in ms from chip data sheet */
> > +static s16 ps_rates[] = {10, 20, 30, 40, 70, 100, 200, 500, 1000, 2000};
> > +
>
> Same with these.
> > +/* Supported IR-led currents in mA */
> > +static const u8 ps_curr_ma[] = {5, 10, 20, 50, 100, 150, 200};
> > +
> > +/* chip->mutex must be locked during this function */
> > +static int bh1770glc_ps_interrupt_control(struct bh1770glc_chip *chip, int ps)
> > +{
> > + chip->int_mode_ps = ps;
> > +
> > + /* Set PS interrupt mode, interrupt active low, latched */
> > + return i2c_smbus_write_byte_data(chip->client,
> > + BHCHIP_INTERRUPT,
>
> This one confuses me a little... Why are we changing the int_mode_als in the ps
> driver? Might be obvious with data sheet, but it isn't without it. I'm guessing
> the leds would make that data incorrect...
Interrupt control register is shared one. Als state is just read from
status variables instead of I2C read-modify-write operation.
> > + (chip->int_mode_als << 1) | (ps << 0));
> > +}
> > +
> > +/* LEDs are controlled by the chip during proximity scanning */
> > +static int bh1770glc_led_cfg(struct bh1770glc_chip *chip, u8 ledcurr[3])
> > +{
> > + u8 ledcfg;
> > + int ret, i;
> > +
> > + ledcfg = chip->pdata->leds;
> > +
> > + for (i = 0; i < BHCHIP_PS_CHANNELS; i++)
> > + if (ledcurr[i] > chip->pdata->led_max_curr)
> > + return -EINVAL;
> > +
> > + for (i = 0; i < BHCHIP_PS_CHANNELS; i++)
> > + chip->ps_leds[i] = ledcurr[i];
> > +
> > + /* LED cfg, current for leds 1 and 2 */
> > + ret = i2c_smbus_write_byte_data(chip->client,
> > + BHCHIP_I_LED,
> > + (ledcfg << 6) | (ledcurr[1] << 3) |
> > + ledcurr[0]);
> > + if (ret < 0)
> > + goto fail;
> > +
> > + /* Current for led 3*/
> > + ret = i2c_smbus_write_byte_data(chip->client,
> > + BHCHIP_I_LED3,
> > + ledcurr[2]);
> > +fail:
> > + return ret;
> > +}
> > +
> Modes need documenting (and probably something in userspace to tell use what
> is available.
> > +int bh1770glc_ps_mode(struct bh1770glc_chip *chip, int mode)
> > +{
> > + int ret;
> > +
> > + ret = i2c_smbus_write_byte_data(chip->client, BHCHIP_PS_CONTROL, mode);
> > + if (ret == 0)
> > + chip->ps_mode = mode;
> > + return ret;
> > +}
> > +
> > +static int bh1770glc_ps_rates(struct bh1770glc_chip *chip, int rate,
> > + int rate_threshold)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < ARRAY_SIZE(ps_rates); i++) {
> > + if (ps_rates[i] == rate) {
> > + chip->ps_rate = i;
> > + break;
> > + }
> > + }
> > + if (i == ARRAY_SIZE(ps_rates))
> > + return -EINVAL;
> > +
> > + for (i = 0; i < ARRAY_SIZE(ps_rates); i++) {
> > + if (ps_rates[i] == rate_threshold) {
> > + chip->ps_rate_threshold = i;
> > + return 0;
> > + }
> > + }
> > + return -EINVAL;
> > +}
> > +
> > +static int bh1770glc_ps_rate(struct bh1770glc_chip *chip, int mode)
> > +{
> > + int ret;
> > + int rate;
> > +
> > + rate = (mode == PS_ABOVE_THRESHOLD) ?
> > + chip->ps_rate_threshold : chip->ps_rate;
> > +
> > + ret = i2c_smbus_write_byte_data(chip->client,
> > + BHCHIP_PS_MEAS_RATE,
> > + rate);
> > + return ret;
> > +}
> > +
> > +static int bh1770glc_ps_read_result(struct bh1770glc_chip *chip)
> > +{
> > + int ret;
> > + int i;
> > +
> > + mutex_lock(&chip->mutex);
> > + for (i = 0; i < ARRAY_SIZE(chip->ps_data); i++) {
> > + ret = i2c_smbus_read_byte_data(chip->client,
> > + BHCHIP_PS_DATA_LED1 + i);
> > + if (ret < 0)
> > + goto out;
> > + chip->ps_data[i] = ret;
> > + }
> > + chip->ps_offset += sizeof(struct bh1770glc_ps);
> > +out:
> > + mutex_unlock(&chip->mutex);
> > + return ret;
> > +}
> > +
> > +static int bh1770glc_ps_set_thresholds(struct bh1770glc_chip *chip)
> > +{
> > + int ret, i;
> > + u8 data[BHCHIP_PS_CHANNELS];
> > + u32 tmp;
> > +
> > + for (i = 0; i < BHCHIP_PS_CHANNELS; i++) {
> > + tmp = ((u32)chip->ps_thresholds[i] * BHCHIP_CALIB_SCALER) /
> > + chip->ps_calib[i];
> > + if (tmp > BHCHIP_PS_RANGE)
> > + tmp = BHCHIP_PS_RANGE;
> > + data[i] = tmp;
> > + }
> > +
> > + ret = i2c_smbus_write_i2c_block_data(chip->client,
> > + BHCHIP_PS_TH_LED1,
> > + BHCHIP_PS_CHANNELS,
> > + data);
> > + return ret;
> > +}
> > +
> > +static ssize_t bh1770glc_ps_read(struct file *file, char __user *buf,
> > + size_t count, loff_t *offset)
> > +{
> > + struct bh1770glc_ps ps;
> > + struct bh1770glc_chip *chip = bh1770glc;
> > + int i;
> > + u16 data[BHCHIP_PS_CHANNELS];
> > +
> > + if (count < sizeof(ps))
> > + return -EINVAL;
> > +
> > + if (*offset >= chip->ps_offset) {
> > + if (file->f_flags & O_NONBLOCK)
> > + return -EAGAIN;
> > + if (wait_event_interruptible(bh1770glc->ps_misc_wait,
> > + (*offset < chip->ps_offset)))
> > + return -ERESTARTSYS;
> > + }
> > +
> > + for (i = 0; i < BHCHIP_PS_CHANNELS; i++) {
> > + data[i] = ((u32)chip->ps_data[i] * chip->ps_calib[i]) /
> > + BHCHIP_CALIB_SCALER;
> > + if (data[i] > BHCHIP_PS_RANGE)
> > + data[i] = BHCHIP_PS_RANGE;
> > + }
> > +
> > + ps.led1 = data[0];
> > + ps.led2 = data[1];
> > + ps.led3 = data[2];
> > +
> > + *offset = chip->ps_offset;
> > +
> > + return copy_to_user(buf, &ps, sizeof(ps)) ? -EFAULT : sizeof(ps);
> > +}
> > +
> > +static void bh1770glc_ps_work(struct work_struct *work)
> > +{
> > + struct bh1770glc_chip *chip =
> > + container_of(work, struct bh1770glc_chip, ps_work.work);
> > +
> > + bh1770glc_ps_rate(chip, PS_BELOW_THRESHOLD);
> > + bh1770glc_ps_read_result(chip);
> > + wake_up_interruptible(&chip->ps_misc_wait);
> > +}
> > +
> > +void bh1770glc_ps_interrupt_handler(struct bh1770glc_chip *chip, int status)
> > +{
> > + if (chip->int_mode_ps)
> > + if (status & BHCHIP_INT_LEDS_INT) {
> > + int rate = ps_rates[chip->ps_rate_threshold];
> > +
> > + bh1770glc_ps_read_result(chip);
> > + bh1770glc_ps_rate(chip, PS_ABOVE_THRESHOLD);
> > + wake_up_interruptible(&bh1770glc->ps_misc_wait);
> > +
> > + cancel_delayed_work_sync(&chip->ps_work);
> > + /*
> > + * Let's recheck situation 50 ms after the next
> > + * expected threshold interrupt.
> > + */
> Why? This seems unusual enough to ened a comment explaining what might
> cause this to happen.
Proximity part can trig interrupt only when level is above treshold.
Interrupts are coming periodically as long as the level is high enough.
Work is trigged to happen little bit after the next measrement. Work is
simply cancelledin the interrupt handler. If the interrupt is not
trigged, driver knows that latest measurement was below threshold.
Driver infors userspace and restores chip to faster measurement mode.
Driver configures chip to use faster rate when there is no proximity
event active to allow faster reactions to the proximity event. When
measurements are above threshold slower rate is configured to reduce
interrupt load and unnecessary system wakeups. Both slow and fast rates
can be controller via sysfs and they can be same.
>
> > + schedule_delayed_work(&chip->ps_work,
> > + msecs_to_jiffies(rate + 50));
> > + }
> > +}
> > +
> > +/* Proximity misc device */
> > +static unsigned int bh1770glc_ps_poll(struct file *file, poll_table *wait)
> > +{
> > + poll_wait(file, &bh1770glc->ps_misc_wait, wait);
> > + if (file->f_pos < bh1770glc->ps_offset)
> > + return POLLIN | POLLRDNORM;
> > + return 0;
> > +}
> > +
> > +static int bh1770glc_ps_open(struct inode *inode, struct file *file)
> > +{
> > + struct bh1770glc_chip *chip = bh1770glc;
> > + int err;
> > +
> > + mutex_lock(&chip->mutex);
> > + err = 0;
> > + if (!chip->ps_users) {
> > + err = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
> > + chip->regs);
> > + if (err < 0)
> > + goto release_lock;
> > +
> > + if (!chip->als_users)
> > + msleep(BHCHIP_STARTUP_DELAY);
> > +
> > + /* Refresh all configs in case of regulators were off */
> > + err = bh1770glc_ps_set_thresholds(chip);
> > + if (err < 0)
> > + goto exit;
> > +
> > + err = bh1770glc_led_cfg(chip, chip->ps_leds);
> > + if (err < 0)
> > + goto exit;
> > +
> > + err = bh1770glc_ps_rate(chip, PS_BELOW_THRESHOLD);
> > + if (err < 0)
> > + goto exit;
> > +
> > + err = bh1770glc_ps_interrupt_control(chip, BHCHIP_ENABLE);
> > + if (err < 0)
> > + goto exit;
> > +
> > + err = bh1770glc_ps_mode(chip, BHCHIP_STANDALONE);
> > + }
> > + if (err == 0)
> > + chip->ps_users++;
> > +exit:
> > + if (err < 0)
> > + regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
> > +
> > +release_lock:
> > + file->f_pos = chip->ps_offset;
> > + mutex_unlock(&chip->mutex);
> > +
> > + if (err == 0) {
> > + cancel_delayed_work_sync(&chip->ps_work);
> > + schedule_delayed_work(&chip->ps_work,
> > + msecs_to_jiffies(BHCHIP_PS_INIT_DELAY));
> > + }
> > +
> > + return err;
> > +}
> > +
> > +static int bh1770glc_ps_close(struct inode *inode, struct file *file)
> > +{
> > + struct bh1770glc_chip *chip = bh1770glc;
> > + mutex_lock(&chip->mutex);
> > + if (!--chip->ps_users) {
> > + bh1770glc_ps_interrupt_control(chip, BHCHIP_DISABLE);
> > + bh1770glc_ps_mode(chip, BHCHIP_STANDBY);
> > + regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
> > + }
> > + mutex_unlock(&chip->mutex);
> > + return 0;
> > +}
> > +
> > +static ssize_t bh1770glc_get_ps_mode(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + return sprintf(buf, "%d\n", chip->ps_mode);
> > +}
> > +
> This looks like two separate values to me? (and it is far from clear what
> they are!)
See explanation above. I'll document these and add separate sysfs
entries.
> > +static ssize_t bh1770glc_get_ps_rate(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + return sprintf(buf, "%d %d\n", ps_rates[chip->ps_rate],
> > + ps_rates[chip->ps_rate_threshold]);
> > +}
> > +
> > +static ssize_t bh1770glc_set_ps_rate(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + int rate = 0, rate_threshold = 0;
> > + int ret;
> > +
> > + ret = sscanf(buf, "%d %d", &rate, &rate_threshold);
> > + if (ret < 0)
> > + return ret;
> > +
> > + if (ret == 0)
> > + return count;
> > +
> > + /* Second value is optional */
> > + if (ret == 1)
> > + rate_threshold = ps_rates[chip->ps_rate_threshold];
> > +
> > + mutex_lock(&chip->mutex);
> > + ret = bh1770glc_ps_rates(chip, rate, rate_threshold);
> > + mutex_unlock(&chip->mutex);
> > +
> > + if (ret < 0)
> > + return ret;
> > +
> > + return count;
> > +}
> > +
> > +static ssize_t bh1770glc_ps_calib_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > +
> If these are for the 3 leds then I think this should be 3 separate files.
> (one value per file) Not to mention, should these be there if not all
> leds are in use?
> > + return snprintf(buf, PAGE_SIZE, "%u %u %u\n", chip->ps_calib[0],
> > + chip->ps_calib[1], chip->ps_calib[2]);
> > +}
> > +
> > +static ssize_t bh1770glc_ps_calib_store(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t len)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + int calib[BHCHIP_PS_CHANNELS];
> > + int i, ret;
> > +
> > + for (i = 0; i < BHCHIP_PS_CHANNELS; i++)
> > + calib[i] = BHCHIP_PS_NEUTRAL_CALIB_VALUE;
> > + ret = sscanf(buf, "%d %d %d", &calib[0], &calib[1], &calib[2]);
> > + if (ret < 0)
> > + return ret;
> > + if (ret < chip->ps_channels)
> > + return -EINVAL;
> > +
> > + for (i = 0; i < chip->ps_channels; i++)
> > + chip->ps_calib[i] = calib[i];
> > +
> > + return len;
> > +}
> > +
> Again, one value per file.
> > +static ssize_t bh1770glc_get_ps_thres(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + return sprintf(buf, "%d %d %d\n", chip->ps_thresholds[0],
> > + chip->ps_thresholds[1],
> > + chip->ps_thresholds[2]);
> > +}
> > +
> > +static ssize_t bh1770glc_set_ps_thres(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + int input[BHCHIP_PS_CHANNELS];
> > + int ret;
> > + int i;
> > +
> > + for (i = 0; i < ARRAY_SIZE(input); i++)
> > + input[i] = BHCHIP_PS_RANGE;
> > + ret = sscanf(buf, "%d %d %d", &input[0], &input[1], &input[2]);
> > +
> > + if (ret < 0)
> > + return ret;
> > + if (ret < chip->ps_channels)
> > + return -EINVAL;
> > +
> > + for (i = 0; i < ARRAY_SIZE(input); i++) {
> > + if ((input[i] < 0) ||
> > + (input[i] > BHCHIP_PS_RANGE))
> > + return -EINVAL;
> > + chip->ps_thresholds[i] = input[i];
> > + }
> > +
> > + mutex_lock(&chip->mutex);
> > + ret = bh1770glc_ps_set_thresholds(chip);
> > + mutex_unlock(&chip->mutex);
> > + if (ret < 0)
> > + return ret;
> > +
> > + return count;
> > +}
> > +
>
> This is showing led current? Naming doesn't make this clear at the
> moment.
> > +static ssize_t bh1770glc_ps_leds_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + u8 led_current[BHCHIP_PS_CHANNELS];
> > + int i;
> > +
> > + memset(led_current, 0, sizeof(led_current));
> > + for (i = 0; i < chip->ps_channels; i++)
> > + led_current[i] = ps_curr_ma[chip->ps_leds[i]];
> > +
> > + return sprintf(buf, "%d %d %d\n", led_current[0],
> > + led_current[1],
> > + led_current[2]);
> > +}
> > +
> > +static ssize_t bh1770glc_ps_leds_store(struct device *dev,
> > + struct device_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + int input[BHCHIP_PS_CHANNELS];
> > + u8 led_curr[BHCHIP_PS_CHANNELS];
> > + int ret;
> > + int i, j;
> > +
> > + ret = sscanf(buf, "%d %d %d", &input[0], &input[1], &input[2]);
> > + if (ret < 0)
> > + return ret;
> > + if (ret < chip->ps_channels)
> > + return -EINVAL;
> > +
> > + /* Set minimum current */
> > + for (i = chip->ps_channels; i < BHCHIP_PS_CHANNELS; i++)
> > + led_curr[i] = BH1770GLC_LED_5mA;
> > +
> > + for (i = 0; i < chip->ps_channels; i++) {
> > + for (j = 0; j < ARRAY_SIZE(ps_curr_ma); j++)
> > + if (input[i] == ps_curr_ma[j]) {
> > + led_curr[i] = j;
> > + break;
> > + }
> > + if (j == ARRAY_SIZE(ps_curr_ma))
> > + return -EINVAL;
> > + }
> > +
> > + mutex_lock(&chip->mutex);
> > + ret = bh1770glc_led_cfg(chip, led_curr);
> > + mutex_unlock(&chip->mutex);
> > + if (ret < 0)
> > + return ret;
> > +
> > + return count;
> > +}
> > +
> > +static ssize_t bh1770glc_chip_id_show(struct device *dev,
> > + struct device_attribute *attr, char *buf)
> > +{
> > + struct bh1770glc_chip *chip = dev_get_drvdata(dev);
> > + return sprintf(buf, "%s rev %d\n", chip->chipname, chip->revision);
> > +}
> > +
> > +static DEVICE_ATTR(ps_mode, S_IRUGO, bh1770glc_get_ps_mode, NULL);
> > +static DEVICE_ATTR(ps_rate, S_IRUGO | S_IWUSR, bh1770glc_get_ps_rate,
> > + bh1770glc_set_ps_rate);
> > +static DEVICE_ATTR(ps_threshold, S_IRUGO | S_IWUSR, bh1770glc_get_ps_thres,
> > + bh1770glc_set_ps_thres);
> > +static DEVICE_ATTR(ps_calib, S_IRUGO | S_IWUSR, bh1770glc_ps_calib_show,
> > + bh1770glc_ps_calib_store);
> > +static DEVICE_ATTR(ps_leds, S_IRUGO | S_IWUSR, bh1770glc_ps_leds_show,
> > + bh1770glc_ps_leds_store);
> > +static DEVICE_ATTR(chip_id, S_IRUGO, bh1770glc_chip_id_show, NULL);
> > +
> > +static struct attribute *sysfs_attrs[] = {
> > + &dev_attr_ps_calib.attr,
> > + &dev_attr_ps_mode.attr,
> > + &dev_attr_ps_rate.attr,
> > + &dev_attr_ps_threshold.attr,
> > + &dev_attr_ps_leds.attr,
> > + &dev_attr_chip_id.attr,
> > + NULL
> > +};
> > +
> > +static struct attribute_group bh1770glc_attribute_group = {
> > + .attrs = sysfs_attrs
> > +};
> > +
> > +static const struct file_operations bh1770glc_ps_fops = {
> > + .owner = THIS_MODULE,
> > + .llseek = no_llseek,
> > + .read = bh1770glc_ps_read,
> > + .poll = bh1770glc_ps_poll,
> > + .open = bh1770glc_ps_open,
> > + .release = bh1770glc_ps_close,
> > +};
> > +
> > +static struct miscdevice bh1770glc_ps_miscdevice = {
> > + .minor = MISC_DYNAMIC_MINOR,
> > + .name = "bh1770glc_ps",
> > + .fops = &bh1770glc_ps_fops
> > +};
> > +
> > +int bh1770glc_ps_init(struct bh1770glc_chip *chip)
> > +{
> > + int err;
> > + int i;
> > +
> > + for (i = 0; i < BHCHIP_PS_CHANNELS; i++) {
> > + chip->ps_thresholds[i] = BHCHIP_PS_DEF_THRES;
> > + chip->ps_leds[i] = chip->pdata->led_def_curr[i];
> > + }
> > +
> > + err = bh1770glc_ps_mode(chip, BHCHIP_STANDBY);
> > + if (err < 0)
> > + goto fail1;
> > +
> > + err = bh1770glc_ps_interrupt_control(chip, BHCHIP_DISABLE);
> > + if (err < 0)
> > + goto fail1;
> > +
> > + bh1770glc_ps_rates(chip, BHCHIP_PS_DEFAULT_RATE,
> > + BHCHIP_PS_DEF_RATE_THRESH);
> > +
> > + INIT_DELAYED_WORK(&chip->ps_work, bh1770glc_ps_work);
> > +
> > + bh1770glc_ps_miscdevice.parent = &chip->client->dev;
> > + err = misc_register(&bh1770glc_ps_miscdevice);
> > + if (err < 0) {
> > + dev_err(&chip->client->dev, "Device registration failed\n");
> > + goto fail1;
> > + }
> > +
> > + err = sysfs_create_group(&chip->client->dev.kobj,
> > + &bh1770glc_attribute_group);
> > + if (err < 0) {
> > + dev_err(&chip->client->dev, "Sysfs registration failed\n");
> > + goto fail2;
> > + }
> > + return 0;
> > +fail2:
> > + misc_deregister(&bh1770glc_ps_miscdevice);
> > +fail1:
> > + return err;
> > +
> > +}
> > +
> > +int bh1770glc_ps_destroy(struct bh1770glc_chip *chip)
> > +{
> > + cancel_delayed_work_sync(&chip->ps_work);
> > + sysfs_remove_group(&chip->client->dev.kobj,
> > + &bh1770glc_attribute_group);
> > + misc_deregister(&bh1770glc_ps_miscdevice);
> > + return 0;
> > +}
> > diff --git a/include/linux/bh1770glc.h b/include/linux/bh1770glc.h
> > new file mode 100644
> > index 0000000..27d2d7c
> > --- /dev/null
> > +++ b/include/linux/bh1770glc.h
> > @@ -0,0 +1,39 @@
> > +#ifndef __BH1770GLC_H__
> > +#define __BH1770GLC_H__
> > +
> > +struct bh1770glc_platform_data {
> > +/* IR-Led configuration for proximity sensing */
> > +#define BH1770GLC_LED1 0x00
> > +#define BH1770GLC_LED12 0x01
> > +#define BH1770GLC_LED13 0x02
> > +#define BH1770GLC_LED123 0x03
> > +
> > + __u8 leds;
> > +/* led_max_curr is a safetylimit for IR leds */
> > +#define BH1770GLC_LED_5mA 0
> > +#define BH1770GLC_LED_10mA 1
> > +#define BH1770GLC_LED_20mA 2
> > +#define BH1770GLC_LED_50mA 3
> > +#define BH1770GLC_LED_100mA 4
> > +#define BH1770GLC_LED_150mA 5
> > +#define BH1770GLC_LED_200mA 6
> > + __u8 led_max_curr;
> > + __u8 led_def_curr[3];
> > +
> > + int (*setup_resources)(void);
> > + int (*release_resources)(void);
> > +};
> > +
> What if someone wires up more than one?
hmm. perhaps some numbering would be needed
> > +/* Device name: /dev/bh1770glc_ps */
> > +struct bh1770glc_ps {
> > + __u8 led1;
> > + __u8 led2;
> > + __u8 led3;
> > +} __attribute__((packed));
> > +
> Likewise...
> > +/* Device name: /dev/bh1770glc_als */
> > +struct bh1770glc_als {
> > + __u16 lux;
> > +} __attribute__((packed));
> > +
> > +#endif
>
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