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Message-ID: <CAKdam566qVqTH7FgYkUMnWxdy=knCxDU=V-xzNibkCPD2keMbg@mail.gmail.com>
Date: Fri, 15 Jun 2012 20:37:21 +0530
From: "Poddar, Sourav" <sourav.poddar@...com>
To: devicetree-discuss@...ts.ozlabs.org, linux-input@...r.kernel.org,
dtor@...l.ru
Cc: linux-kernel@...r.kernel.org, Benoit Cousson <b-cousson@...com>,
Rob Herring <rob.herring@...xeda.com>,
Grant Likely <grant.likely@...retlab.ca>,
Felipe Balbi <balbi@...com>,
Randy Dunlap <rdunlap@...otime.net>,
Samuel Ortiz <sameo@...ux.intel.com>,
Peter Ujfalusi <peter.ujfalusi@...com>,
Alan Cox <alan@...ux.intel.com>,
Ashish Jangam <ashish.jangam@...tcummins.com>,
Anirudh Ghayal <aghayal@...eaurora.org>
Subject: Re: [PATCH] Input: tsl2771: ambient light and proximity driver
Hi Dmitry,
On Tue, Jun 5, 2012 at 4:01 PM, Sourav Poddar <sourav.poddar@...com> wrote:
> From: Dan Murphy <DMurphy@...com>
>
> Add tsl2771 ambient light and proximity driver.
>
> Tested on 3.4-rc6 custom kernel having omap5
> evm device tree support.
>
> Will post the device tree data once the dts files for omap5
> will be available in mainline.
>
> Cc: Benoit Cousson <b-cousson@...com>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: Felipe Balbi <balbi@...com>
> Cc: Randy Dunlap <rdunlap@...otime.net>
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> Cc: Peter Ujfalusi <peter.ujfalusi@...com>
> Cc: Alan Cox <alan@...ux.intel.com>
> Cc: Ashish Jangam <ashish.jangam@...tcummins.com>
> Cc: Anirudh Ghayal <aghayal@...eaurora.org>
> Signed-off-by: Dan Murphy <DMurphy@...com>
> Signed-off-by: Sourav Poddar <sourav.poddar@...com>
> [Sourav Poddar: - Adapted to device tree]
> ---
> .../devicetree/bindings/input/tsl2771.txt | 86 ++
> drivers/input/misc/Kconfig | 10 +
> drivers/input/misc/Makefile | 1 +
> drivers/input/misc/tsl2771.c | 973 ++++++++++++++++++++
> include/linux/i2c/tsl2771.h | 71 ++
> 5 files changed, 1141 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/input/tsl2771.txt
> create mode 100644 drivers/input/misc/tsl2771.c
> create mode 100644 include/linux/i2c/tsl2771.h
>
> diff --git a/Documentation/devicetree/bindings/input/tsl2771.txt b/Documentation/devicetree/bindings/input/tsl2771.txt
> new file mode 100644
> index 0000000..f298475
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/tsl2771.txt
> @@ -0,0 +1,86 @@
> +* TAOS's ambient light and proximity Controller device tree bindings
> +
> +The TSL2771 family of devices, an i2c based device, provides both ambient
> +light sensing (ALS) and proximity detection (when coupled with an external IR LED).
> +The ALS approximates human eye response to light intensity under a variety
> +of lighting conditions and through a variety of attenuation materials.
> +The proximity detection feature allows a large dynamic range of operation
> +for use in short distance detection behind dark glass such as in a cell phone.
> +
> +Required SoC Specific Properties:
> +- compatible: should be one of the following
> +- "tsl2771,alps": For controllers compatible with
> + taos tsl2771 controller.
> +
> +Required Board Specific Properties:
> +- tsl2771,gpio : gpio used to signal an interrupt
> +- tsl2771,irq_flags : Flags used to configure the irq type
> + (Edge triggered/Level Triggerred)
> +- tsl2771,def_enable : Used to power the device on/off, enable
> + functions and interrupts.
> +- tsl2771,als_adc_time : Ambient light internal integration time of the
> + ALS clear and IR channel ADCs.
> +- tsl2771,prox_adc_time : Controls the integration time of the proximity
> + ADC
> +- tsl2771,wait_time : Wait time required between state transition.
> +- tsl2771,als_low_thresh_low_byte :
> +- tsl2771,als_low_thresh_high_byte :
> + Value to be used as a low trigger points for the comparison function
> + for interrupt generation for ambient light sensor.
> +- tsl2771,als_high_thresh_low_byte :
> +- tsl2771,als_high_thresh_high_byte :
> + Value to be used as a high trigger points for the comparison function
> + for interrupt generation for ambient light sensor.
> +- tsl2771,prox_low_thresh_low_byte :
> +- tsl2771,prox_low_thresh_high_byte :
> + Value to be used as a low trigger points for the comparison function
> + for interrupt generation for proximity sensor.
> +- tsl2771,prox_high_thresh_low_byte :
> +- tsl2771,prox_high_thresh_high_byte :
> + Value to be used as a high trigger points for the comparison function
> + for interrupt generationi for proximity sensor.
> +
> +- tsl2771,interrupt_persistence : Controls the filtering interrupt capabilities
> + of the device.
> +- tsl2771,config : Sets the wait long time
> +- tsl2771,prox_pulse_count : Sets the number of proximity pulses that will be transmitted.
> +- tsl2771,gain_control : Control functions such as gain settings and diode selection.
> +- tsl2771,glass_attn :
> +- tsl2771,device_factor :
> + Properties depending on which the calculation of
> + "counts per linux(cpl)" depends.
> +- tsl2771,prox_enable_flag : signifies that proximity sensor is to be enabled
> +- tsl2771,als_enable_flag : Signifies that ambient light sensor is to be enabled.
> +
> +Example:
> +
> +&i2c2 {
> + clock-frequency = <400000>;
> +
> + tsl2771@39 {
> + compatible = "tsl2771,alps";
> + reg = <0x39>;
> + tsl2771,gpio = <149>;
> + tsl2771,irq_flags = <0x0000200a>;
> + tsl2771,def_enable = <0x0>;
> + tsl2771,als_adc_time = <0xdb>;
> + tsl2771,prox_adc_time = <0xff>;
> + tsl2771,wait_time = <0x00>;
> + tsl2771,als_low_thresh_low_byte = <0x0>;
> + tsl2771,als_low_thresh_high_byte = <0x0>;
> + tsl2771,als_high_thresh_low_byte = <0x0>;
> + tsl2771,als_high_thresh_high_byte = <0x0>;
> + tsl2771,prox_low_thresh_low_byte = <0x0>;
> + tsl2771,prox_low_thresh_high_byte = <0x0>;
> + tsl2771,prox_high_thresh_low_byte = <0x0>;
> + tsl2771,prox_high_thresh_high_byte = <0x0>;
> + tsl2771,interrupt_persistence = <0xf6>;
> + tsl2771,config = <0x00>;
> + tsl2771,prox_pulse_count = <0x03>;
> + tsl2771,gain_control = <0xe0>;
> + tsl2771,glass_attn = <0x01>;
> + tsl2771,device_factor = <0x34>;
> + tsl2771,prox_enable_flag;
> + tsl2771,als_enable_flag;
> + };
> +};
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index 7faf4a7..cc85b22 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -177,6 +177,16 @@ config INPUT_MPU3050
> To compile this driver as a module, choose M here: the
> module will be called mpu3050.
>
> +config INPUT_TSL2771
> + tristate "TSL2771 ALS/Proximity Sensor Driver"
> + depends on I2C && SYSFS
> + help
> + Say Y here if you want to use TSL2771 ALS/Proximity Sensor Driver
> + through I2C interface.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called tsl2771.
> +
> config INPUT_APANEL
> tristate "Fujitsu Lifebook Application Panel buttons"
> depends on X86 && I2C && LEDS_CLASS
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index f55cdf4..2f72aaf 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -35,6 +35,7 @@ obj-$(CONFIG_INPUT_MAX8997_HAPTIC) += max8997_haptic.o
> obj-$(CONFIG_INPUT_MC13783_PWRBUTTON) += mc13783-pwrbutton.o
> obj-$(CONFIG_INPUT_MMA8450) += mma8450.o
> obj-$(CONFIG_INPUT_MPU3050) += mpu3050.o
> +obj-$(CONFIG_INPUT_TSL2771) += tsl2771.o
> obj-$(CONFIG_INPUT_PCAP) += pcap_keys.o
> obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o
> obj-$(CONFIG_INPUT_PCF8574) += pcf8574_keypad.o
> diff --git a/drivers/input/misc/tsl2771.c b/drivers/input/misc/tsl2771.c
> new file mode 100644
> index 0000000..ec96493
> --- /dev/null
> +++ b/drivers/input/misc/tsl2771.c
> @@ -0,0 +1,973 @@
> +/**
> + * tsl2771.c - ALS and Proximity sensor driver
> + *
> + * Copyright (C) 2011 Texas Instruments
> + * Author: Dan Murphy <DMurphy@...com>
> + *
> + * This file is subject to the terms and conditions of the GNU General
> + * Public License. See the file "COPYING" in the main directory of this
> + * archive for more details.
> + *
> + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + *
> + */
> +
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/interrupt.h>
> +#include <linux/delay.h>
> +#include <linux/input.h>
> +#include <linux/pm.h>
> +#include <linux/platform_device.h>
> +#include <linux/workqueue.h>
> +#include <linux/i2c.h>
> +#include <linux/i2c/tsl2771.h>
> +#include <linux/gpio.h>
> +
> +#define TSL2771_DEBUG 1
> +
> +#define TSL2771_ALLOWED_R_BYTES 25
> +#define TSL2771_ALLOWED_W_BYTES 2
> +#define TSL2771_MAX_RW_RETRIES 5
> +#define TSL2771_I2C_RETRY_DELAY 10
> +
> +#define TSL2771_I2C_WRITE 0x80
> +#define TSL2771_I2C_READ 0xa0
> +
> +#define TSL2771_PROX_INT_CLR 0x65
> +#define TSL2771_ALS_INT_CLR 0x66
> +#define TSL2771_ALL_INT_CLR 0x67
> +
> +/* TSL2771 Read only registers */
> +#define TSL2771_REV 0x11
> +#define TSL2771_ID 0x12
> +#define TSL2771_STATUS 0x13
> +#define TSL2771_CDATAL 0x14
> +#define TSL2771_CDATAH 0x15
> +#define TSL2771_IRDATAL 0x16
> +#define TSL2771_IRDATAH 0x17
> +#define TSL2771_PDATAL 0x18
> +#define TSL2771_PDATAH 0x19
> +
> +/* Enable register mask */
> +#define TSL2771_PWR_ON (1 << 0)
> +#define TSL2771_ADC_EN (1 << 1)
> +#define TSL2771_PROX_EN (1 << 2)
> +#define TSL2771_WAIT_EN (1 << 3)
> +#define TSL2771_ALS_INT_EN (1 << 4)
> +#define TSL2771_PROX_INT_EN (1 << 5)
> +
> +#define TSL2771_ALS_INT (1 << 4)
> +#define TSL2771_PROX_INT (1 << 5)
> +
> +#define TSL2771_ALS_EN_FLAG 0x01
> +#define TSL2771_PROX_EN_FLAG 0x02
> +
> +struct tsl2771_data {
> + struct i2c_client *client;
> + struct input_dev *prox_input_dev;
> + struct input_dev *als_input_dev;
> + struct mutex enable_mutex;
> +
> + int lux;
> + int prox_distance;
> + int power_state;
> + int power_context;
> + int als_gain;
> + int glass_attn;
> + int device_factor;
> + int irq_flags;
> + int flags;
> + int gpio;
> +
> + uint32_t def_enable;
> + uint32_t als_adc_time;
> + uint32_t prox_adc_time;
> + uint32_t wait_time;
> + uint32_t als_ltlb;
> + uint32_t als_lthb;
> + uint32_t als_htlb;
> + uint32_t als_hthb;
> + uint32_t prox_ltlb;
> + uint32_t prox_lthb;
> + uint32_t prox_htlb;
> + uint32_t prox_hthb;
> + uint32_t interrupt_persistence;
> + uint32_t config;
> + uint32_t prox_pulse_count;
> + uint32_t gain_control;
> +};
> +
> +static int als_gain_table[4] = {
> + 1, 8, 16, 120
> +};
> +
> +static uint32_t als_prox_debug;
> +module_param_named(tsl2771_debug, als_prox_debug, uint, 0664);
> +
> +#ifdef TSL2771_DEBUG
> +struct tsl2771_reg {
> + const char *name;
> + uint8_t reg;
> + int writeable;
> +} tsl2771_regs[] = {
> + { "REV", TSL2771_REV, 0 },
> + { "CHIP_ID", TSL2771_ID, 0 },
> + { "STATUS", TSL2771_STATUS, 0 },
> + { "ADC_LOW", TSL2771_CDATAL, 0 },
> + { "ADC_HI", TSL2771_CDATAH, 0 },
> + { "IR_LOW_DATA", TSL2771_IRDATAL, 0 },
> + { "IR_HI_DATA", TSL2771_IRDATAH, 0 },
> + { "P_LOW_DATA", TSL2771_PDATAL, 0 },
> + { "P_HI_DATA", TSL2771_PDATAH, 0 },
> + { "ENABLE", TSL2771_ENABLE, 1 },
> + { "A_ADC_TIME", TSL2771_ATIME, 1 },
> + { "P_ADC_TIME", TSL2771_PTIME, 1 },
> + { "WAIT_TIME", TSL2771_WTIME, 1 },
> + { "A_LOW_TH_LOW", TSL2771_AILTL, 1 },
> + { "A_LOW_TH_HI", TSL2771_AILTH, 1 },
> + { "A_HI_TH_LOW", TSL2771_AIHTL, 1 },
> + { "A_HI_TH_HI", TSL2771_AIHTH, 1 },
> + { "P_LOW_TH_LOW", TSL2771_PILTL, 1 },
> + { "P_LOW_TH_HI", TSL2771_PILTH, 1 },
> + { "P_HI_TH_LOW", TSL2771_PIHTL, 1 },
> + { "P_HI_TH_HI", TSL2771_PIHTH, 1 },
> + { "INT_PERSIT", TSL2771_PERS, 1 },
> + { "PROX_PULSE_CNT", TSL2771_PPCOUNT, 1 },
> + { "CONTROL", TSL2771_CONTROL, 1 },
> +};
> +#endif
> +
> +static int tsl2771_write_reg(struct tsl2771_data *data, u8 reg,
> + u8 val, int len)
> +{
> + int err;
> + int tries = 0;
> + u8 buf[TSL2771_ALLOWED_W_BYTES];
> +
> + struct i2c_msg msgs[] = {
> + {
> + .addr = data->client->addr,
> + .flags = data->client->flags,
> + .len = len + 1,
> + },
> + };
> +
> + buf[0] = (TSL2771_I2C_WRITE | reg);
> + buf[1] = val;
> +
> + msgs->buf = buf;
> +
> + do {
> + err = i2c_transfer(data->client->adapter, msgs, 1);
> + if (err != 1)
> + msleep_interruptible(TSL2771_I2C_RETRY_DELAY);
> + } while ((err != 1) && (++tries < TSL2771_MAX_RW_RETRIES));
> +
> + if (err != 1) {
> + dev_err(&data->client->dev, "write transfer error\n");
> + err = -EIO;
> + } else {
> + err = 0;
> + }
> +
> + return err;
> +}
> +
> +static int tsl2771_read_reg(struct tsl2771_data *data, u8 reg, u8 *buf, int len)
> +{
> + int err;
> + int tries = 0;
> + u8 reg_buf[TSL2771_ALLOWED_R_BYTES];
> +
> + struct i2c_msg msgs[] = {
> + {
> + .addr = data->client->addr,
> + .flags = data->client->flags,
> + .len = 1,
> + },
> + {
> + .addr = data->client->addr,
> + .flags = (data->client->flags | I2C_M_RD),
> + .len = len,
> + .buf = buf,
> + },
> + };
> + reg_buf[0] = (TSL2771_I2C_READ | reg);
> + msgs->buf = reg_buf;
> +
> + do {
> + err = i2c_transfer(data->client->adapter, msgs, 2);
> + if (err != 2)
> + msleep_interruptible(TSL2771_I2C_RETRY_DELAY);
> + } while ((err != 2) && (++tries < TSL2771_MAX_RW_RETRIES));
> +
> + if (err != 2) {
> + dev_err(&data->client->dev, "read transfer error\n");
> + err = -EIO;
> + } else {
> + err = 0;
> + }
> +
> + return err;
> +}
> +
> +static int tsl2771_init_device(struct tsl2771_data *data)
> +{
> + int error = 0;
> +
> + error = tsl2771_write_reg(data, TSL2771_CONFIG, data->config, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_ENABLE,
> + data->def_enable, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_ATIME,
> + data->als_adc_time, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_PTIME,
> + data->prox_adc_time, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_WTIME,
> + data->wait_time, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_AILTL,
> + data->als_ltlb, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_AILTH,
> + data->als_lthb, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_AIHTL,
> + data->als_htlb, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_AIHTH,
> + data->als_hthb, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_PILTL,
> + data->prox_ltlb, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_PILTH,
> + data->prox_lthb, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_PIHTL,
> + data->prox_htlb, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_PIHTH,
> + data->prox_hthb, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_PERS,
> + data->interrupt_persistence, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_PPCOUNT,
> + data->prox_pulse_count, 1);
> + if (error)
> + goto init_error;
> +
> + error = tsl2771_write_reg(data, TSL2771_CONTROL,
> + data->gain_control, 1);
> + if (error)
> + goto init_error;
> +
> + return 0;
> +
> +init_error:
> + pr_err("%s:Failed initializing the device\n", __func__);
> + return -1;
> +
> +}
> +
> +static int tsl2771_read_prox(struct tsl2771_data *data)
> +{
> + u8 data_buffer[4];
> + int prox_data = 0;
> + tsl2771_read_reg(data, TSL2771_PDATAL, data_buffer, 2);
> +
> + prox_data = (data_buffer[1] << 8);
> + prox_data |= data_buffer[0];
> +
> + if (als_prox_debug & 0x2)
> + pr_info("%s:Prox Data 0x%X\n", __func__, prox_data);
> +
> + data->prox_distance = prox_data;
> +
> + return prox_data;
> +}
> +
> +static int tsl2771_read_als(struct tsl2771_data *data)
> +{
> + int cdata_data = 0;
> + int irdata_data = 0;
> + int ratio = 0;
> + int iac = 0;
> + int cpl = 0;
> + int integration_time = 0;
> + u8 data_buffer[4];
> +
> + tsl2771_read_reg(data, TSL2771_CDATAL, data_buffer, 4);
> +
> + cdata_data = (data_buffer[1] << 8);
> + cdata_data |= data_buffer[0];
> + irdata_data = (data_buffer[3] << 8);
> + irdata_data |= data_buffer[2];
> + if (als_prox_debug & 0x1)
> + pr_info("%s: IR Data 0x%X CData 0x%X\n", __func__,
> + irdata_data, cdata_data);
> + if (!cdata_data) {
> + pr_err("%s:cdata is NULL\n", __func__);
> + data->lux = 0;
> + goto out;
> + }
> +
> + ratio = (irdata_data * 100) / cdata_data;
> + if (als_prox_debug & 0x1)
> + pr_info("%s: Ratio is %i\n", __func__, ratio);
> +
> + if ((ratio >= 0) && (ratio <= 30))
> + iac = ((1000 * cdata_data) - (1846 * irdata_data));
> + else if ((ratio >= 30) && (ratio <= 38))
> + iac = ((1268 * cdata_data) - (2740 * irdata_data));
> + else if ((ratio >= 38) && (ratio <= 45))
> + iac = ((749 * cdata_data) - (1374 * irdata_data));
> + else if ((ratio >= 45) && (ratio <= 54))
> + iac = ((477 * cdata_data) - (769 * irdata_data));
> +
> + if (als_prox_debug & 0x1)
> + pr_info("%s: IAC %i\n", __func__, iac);
> +
> + integration_time = (272 * (256 - data->als_adc_time));
> + data->als_gain = als_gain_table[data->gain_control & 0x3];
> + if (data->glass_attn && data->device_factor)
> + cpl = ((integration_time * data->als_gain) /
> + (data->glass_attn * data->device_factor));
> + else
> + pr_err("%s: Device factor or glass attenuation is NULL\n",
> + __func__);
> +
> + if (als_prox_debug & 0x1)
> + pr_info("%s: CPL %i\n", __func__, cpl);
> +
> + if (cpl)
> + data->lux = iac / cpl;
> + else
> + pr_err("%s: Count per lux is zero\n", __func__);
> +
> + if (als_prox_debug & 0x1)
> + pr_info("%s:Current lux is %i\n", __func__, data->lux);
> +
> +out:
> + return data->lux;
> +}
> +static int tsl2771_als_enable(struct tsl2771_data *data, int val)
> +{
> + u8 enable_buf[2];
> + u8 write_buf;
> +
> + tsl2771_read_reg(data, TSL2771_ENABLE, enable_buf, 1);
> + if (val) {
> + write_buf = (TSL2771_ALS_INT_EN | TSL2771_ADC_EN |
> + TSL2771_PWR_ON | enable_buf[0]);
> + data->power_state |= TSL2771_ALS_EN_FLAG;
> + } else {
> + write_buf = (~TSL2771_ALS_INT_EN & ~TSL2771_ADC_EN &
> + enable_buf[0]);
> +
> + if (!(data->power_state & ~TSL2771_PROX_EN_FLAG))
> + write_buf &= ~TSL2771_PWR_ON;
> +
> + data->power_state &= ~TSL2771_ALS_EN_FLAG;
> + }
> +
> + return tsl2771_write_reg(data, TSL2771_ENABLE, write_buf, 1);
> +
> +}
> +
> +static int tsl2771_prox_enable(struct tsl2771_data *data, int val)
> +{
> + u8 enable_buf[2];
> + u8 write_buf;
> +
> + tsl2771_read_reg(data, TSL2771_ENABLE, enable_buf, 1);
> + if (val) {
> + write_buf = (TSL2771_PROX_INT_EN | TSL2771_PROX_EN |
> + TSL2771_PWR_ON | enable_buf[0]);
> + data->power_state |= TSL2771_PROX_EN_FLAG;
> + } else {
> + write_buf = (~TSL2771_PROX_INT_EN & ~TSL2771_PROX_EN &
> + enable_buf[0]);
> +
> + if (!(data->power_state & ~TSL2771_ALS_EN_FLAG))
> + write_buf &= ~TSL2771_PWR_ON;
> +
> + data->power_state &= ~TSL2771_PROX_EN_FLAG;
> + }
> + return tsl2771_write_reg(data, TSL2771_ENABLE, write_buf, 1);
> +
> +}
> +
> +static void tsl2771_report_prox_input(struct tsl2771_data *data)
> +{
> + input_report_abs(data->prox_input_dev, ABS_DISTANCE,
> + data->prox_distance);
> + input_sync(data->prox_input_dev);
> +}
> +
> +static void tsl2771_report_als_input(struct tsl2771_data *data)
> +{
> + input_event(data->als_input_dev, EV_LED, LED_MISC, data->lux);
> + input_sync(data->als_input_dev);
> +}
> +
> +static irqreturn_t tsl2771_work_queue(int irq, void *dev_id)
> +{
> + struct tsl2771_data *data = dev_id;
> + int err = 0;
> + u8 enable_buf[2];
> +
> + mutex_lock(&data->enable_mutex);
> + tsl2771_read_reg(data, TSL2771_STATUS, enable_buf, 1);
> + if (enable_buf[0] & TSL2771_ALS_INT) {
> + err = tsl2771_read_als(data);
> + if (err < 0) {
> + pr_err("%s: Not going to report ALS\n", __func__);
> + goto prox_check;
> + }
> + tsl2771_report_als_input(data);
> + }
> +
> +prox_check:
> + if (enable_buf[0] & TSL2771_PROX_INT) {
> + err = tsl2771_read_prox(data);
> + if (err < 0) {
> + pr_err("%s: Not going to report prox\n", __func__);
> + goto done;
> + }
> + tsl2771_report_prox_input(data);
> + }
> +
> +done:
> + tsl2771_write_reg(data, TSL2771_ALL_INT_CLR, 0, 0);
> + mutex_unlock(&data->enable_mutex);
> + return IRQ_HANDLED;
> +}
> +
> +static ssize_t tsl2771_show_attr_enable(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct tsl2771_data *data = i2c_get_clientdata(client);
> +
> + return sprintf(buf, "%d\n", (data->power_state & 0x3));
> +}
> +
> +static ssize_t tsl2771_store_attr_prox_enable(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct tsl2771_data *data = platform_get_drvdata(pdev);
> + unsigned long val;
> + int error = 0;
> +
> + error = kstrtoul(buf, 0, &val);
> + if (error)
> + return error;
> +
> + if (!(data->flags & TSL2771_USE_PROX)) {
> + pr_err("%s: PROX is not supported by kernel\n", __func__);
> + return -ENODEV;
> + }
> +
> + mutex_lock(&data->enable_mutex);
> +
> + error = tsl2771_prox_enable(data, val);
> + if (error) {
> + pr_err("%s:Failed to turn prox %s\n",
> + __func__, (val ? "on" : "off"));
> + goto error;
> + }
> +
> + error = tsl2771_read_prox(data);
> + tsl2771_report_prox_input(data);
> +error:
> + mutex_unlock(&data->enable_mutex);
> + return count;
> +}
> +
> +static ssize_t tsl2771_store_attr_als_enable(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct tsl2771_data *data = platform_get_drvdata(pdev);
> + unsigned long val;
> + int error = 0;
> +
> + error = kstrtoul(buf, 0, &val);
> + if (error)
> + return error;
> +
> + if (!(data->flags & TSL2771_USE_ALS)) {
> + pr_err("%s: ALS is not supported by kernel\n", __func__);
> + return -ENODEV;
> + }
> +
> + mutex_lock(&data->enable_mutex);
> +
> + error = tsl2771_als_enable(data, val);
> + if (error) {
> + pr_err("%s:Failed to turn prox %s\n",
> + __func__, (val ? "on" : "off"));
> + goto error;
> + }
> +
> + error = tsl2771_read_als(data);
> + tsl2771_report_als_input(data);
> +error:
> + mutex_unlock(&data->enable_mutex);
> + return count;
> +}
> +
> +static ssize_t tsl2771_show_attr_delay(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + return sprintf(buf, "%d\n", 1);
> +}
> +
> +static ssize_t tsl2771_store_attr_delay(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + unsigned long interval;
> + int error = 0;
> +
> + error = kstrtoul(buf, 0, &interval);
> + if (error)
> + return error;
> +
> + return count;
> +}
> +
> +#ifdef TSL2771_DEBUG
> +static ssize_t tsl2771_registers_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct tsl2771_data *data = platform_get_drvdata(pdev);
> + unsigned i, n, reg_count;
> + u8 read_buf[2];
> +
> + reg_count = sizeof(tsl2771_regs) / sizeof(tsl2771_regs[0]);
> + for (i = 0, n = 0; i < reg_count; i++) {
> + tsl2771_read_reg(data, tsl2771_regs[i].reg, read_buf, 1);
> + n += scnprintf(buf + n, PAGE_SIZE - n,
> + "%-20s = 0x%02X\n",
> + tsl2771_regs[i].name,
> + read_buf[0]);
> + }
> +
> + return n;
> +}
> +
> +static ssize_t tsl2771_registers_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct tsl2771_data *data = platform_get_drvdata(pdev);
> + unsigned i, reg_count, value;
> + int error = 0;
> + char name[30];
> +
> + if (count >= 30) {
> + pr_err("%s:input too long\n", __func__);
> + return -1;
> + }
> +
> + if (sscanf(buf, "%s %x", name, &value) != 2) {
> + pr_err("%s:unable to parse input\n", __func__);
> + return -1;
> + }
> +
> + reg_count = sizeof(tsl2771_regs) / sizeof(tsl2771_regs[0]);
> + for (i = 0; i < reg_count; i++) {
> + if (!strcmp(name, tsl2771_regs[i].name)) {
> + if (tsl2771_regs[i].writeable) {
> + error = tsl2771_write_reg(data,
> + tsl2771_regs[i].reg, value, 1);
> + if (error) {
> + pr_err("%s:Failed to write %s\n",
> + __func__, name);
> + return -1;
> + }
> + } else {
> + pr_err("%s:Register %s is not writeable\n",
> + __func__, name);
> + return -1;
> + }
> + return count;
> + }
> + }
> +
> + pr_err("%s:no such register %s\n", __func__, name);
> + return -1;
> +}
> +static ssize_t tsl2771_lux_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct tsl2771_data *data = platform_get_drvdata(pdev);
> +
> + tsl2771_read_als(data);
> + return sprintf(buf, "%d\n", data->lux);
> +}
> +static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO,
> + tsl2771_registers_show, tsl2771_registers_store);
> +
> +static DEVICE_ATTR(lux, S_IWUSR | S_IRUGO,
> + tsl2771_lux_show, NULL);
> +#endif
> +static DEVICE_ATTR(als_enable, S_IWUSR | S_IRUGO,
> + tsl2771_show_attr_enable, tsl2771_store_attr_als_enable);
> +
> +static DEVICE_ATTR(prox_enable, S_IWUSR | S_IRUGO,
> + tsl2771_show_attr_enable, tsl2771_store_attr_prox_enable);
> +
> +static DEVICE_ATTR(delay, S_IWUSR | S_IRUGO,
> + tsl2771_show_attr_delay, tsl2771_store_attr_delay);
> +
> +static struct attribute *tsl2771_attrs[] = {
> + &dev_attr_als_enable.attr,
> + &dev_attr_prox_enable.attr,
> + &dev_attr_delay.attr,
> +#ifdef TSL2771_DEBUG
> + &dev_attr_registers.attr,
> + &dev_attr_lux.attr,
> +#endif
> + NULL
> +};
> +
> +static const struct attribute_group tsl2771_attr_group = {
> + .attrs = tsl2771_attrs,
> +};
> +
> +static struct tsl2771_data *tsl2771_parse_dt(struct i2c_client *client)
> +{
> + struct device_node *np = client->dev.of_node;
> + struct tsl2771_data *data = i2c_get_clientdata(client);
> +
> + if (of_get_property(np, "tsl2771,als_enable_flag", NULL))
> + data->flags = TSL2771_USE_ALS;
> +
> + if (of_get_property(np, "tsl2771,prox_enable_flag", NULL))
> + data->flags |= TSL2771_USE_PROX;
> +
> + of_property_read_u32(np, "tsl2771,irq_flags", &data->irq_flags);
> + of_property_read_u32(np, "tsl2771,gpio", &data->gpio);
> + of_property_read_u32(np, "tsl2771,def_enable", &data->def_enable);
> + of_property_read_u32(np, "tsl2771,als_adc_time", &data->als_adc_time);
> + of_property_read_u32(np, "tsl2771,prox_adc_time", &data->prox_adc_time);
> + of_property_read_u32(np, "tsl2771,wait_time", &data->wait_time);
> + of_property_read_u32(np, "tsl2771,als_low_thresh_low_byte",
> + &data->als_ltlb);
> + of_property_read_u32(np, "tsl2771,als_low_thresh_high_byte",
> + &data->als_lthb);
> + of_property_read_u32(np, "tsl2771,als_high_thresh_low_byte",
> + &data->als_htlb);
> + of_property_read_u32(np, "tsl2771,als_high_thresh_high_byte",
> + &data->als_hthb);
> + of_property_read_u32(np, "tsl2771,prox_low_thresh_low_byte",
> + &data->prox_ltlb);
> + of_property_read_u32(np, "tsl2771,prox_low_thresh_high_byte",
> + &data->prox_lthb);
> + of_property_read_u32(np, "tsl2771,prox_high_thresh_low_byte",
> + &data->prox_htlb);
> + of_property_read_u32(np, "tsl2771,prox_high_thresh_high_byte",
> + &data->prox_hthb);
> + of_property_read_u32(np, "tsl2771,interrupt_persistence",
> + &data->interrupt_persistence);
> + of_property_read_u32(np, "tsl2771,config",
> + &data->config);
> + of_property_read_u32(np, "tsl2771,prox_pulse_count",
> + &data->prox_pulse_count);
> + of_property_read_u32(np, "tsl2771,gain_control",
> + &data->gain_control);
> + of_property_read_u32(np, "tsl2771,glass_attn",
> + &data->glass_attn);
> + of_property_read_u32(np, "tsl2771,device_factor",
> + &data->device_factor);
> +
> + return data;
> +}
> +
> +static int __devinit tsl2771_driver_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct tsl2771_data *data;
> + int ret = 0;
> +
> + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> + pr_err("%s: need I2C_FUNC_I2C\n", __func__);
> + return -ENODEV;
> + }
> +
> + data = devm_kzalloc(&client->dev,
> + sizeof(struct tsl2771_data), GFP_KERNEL);
> + if (!data) {
> + ret = -ENOMEM;
> + goto error;
> + }
> + data->client = client;
> + i2c_set_clientdata(client, data);
> + mutex_init(&data->enable_mutex);
> +
> + data = tsl2771_parse_dt(client);
> +
> + if (data->flags & TSL2771_USE_PROX) {
> + data->prox_input_dev = input_allocate_device();
> + if (data->prox_input_dev == NULL) {
> + ret = -ENOMEM;
> + pr_err("%s:Failed to allocate proximity input device\n",
> + __func__);
> + goto prox_input_error;
> + }
> +
> + data->prox_input_dev->name = "tsl2771_prox";
> + data->prox_input_dev->id.bustype = BUS_I2C;
> + data->prox_input_dev->dev.parent = &data->client->dev;
> + input_set_capability(data->prox_input_dev,
> + EV_ABS, ABS_DISTANCE);
> + input_set_drvdata(data->prox_input_dev, data);
> +
> + __set_bit(EV_ABS, data->prox_input_dev->evbit);
> + input_set_abs_params(data->prox_input_dev,
> + ABS_DISTANCE, 0, 1, 0, 0);
> +
> + ret = input_register_device(data->prox_input_dev);
> + if (ret) {
> + pr_err("%s:Unable to register prox device\n", __func__);
> + goto prox_register_fail;
> + }
> + }
> +
> + if (data->flags & TSL2771_USE_ALS) {
> + data->als_input_dev = input_allocate_device();
> + if (data->als_input_dev == NULL) {
> + ret = -ENOMEM;
> + pr_err("%s:Failed to allocate als input device\n",
> + __func__);
> + goto als_input_error;
> + }
> + data->als_input_dev->name = "tsl2771_als";
> + data->als_input_dev->id.bustype = BUS_I2C;
> + data->als_input_dev->dev.parent = &data->client->dev;
> + input_set_capability(data->als_input_dev, EV_MSC, MSC_RAW);
> + input_set_capability(data->als_input_dev, EV_LED, LED_MISC);
> + input_set_drvdata(data->als_input_dev, data);
> + ret = input_register_device(data->als_input_dev);
> + if (ret) {
> + pr_err("%s:Unable to register als device\n", __func__);
> + goto als_register_fail;
> + }
> + }
> +
> + ret = gpio_request_one(data->gpio, GPIOF_IN, "sensor");
> + if (ret) {
> + dev_err(&data->client->dev, "sensor: gpio request failure\n");
> + return ret;
> + }
> +
> + if (data->gpio) {
> + ret = request_threaded_irq(gpio_to_irq(data->gpio), NULL,
> + tsl2771_work_queue,
> + data->irq_flags,
> + data->client->name, data);
> + if (ret < 0) {
> + dev_err(&data->client->dev,
> + "request_threaded_irq failed\n");
> + goto irq_request_fail;
> + }
> + } else {
> + pr_err("%s: No IRQ defined therefore failing\n", __func__);
> + goto irq_request_fail;
> + }
> +
> + ret = tsl2771_init_device(data);
> + if (ret) {
> + pr_err("%s:TSL2771 device init failed\n", __func__);
> + goto device_init_fail;
> + }
> +
> + data->power_state = 0;
> +
> + ret = sysfs_create_group(&client->dev.kobj, &tsl2771_attr_group);
> + if (ret) {
> + pr_err("%s:Cannot create sysfs group\n", __func__);
> + goto sysfs_create_fail;
> + }
> +
> + return 0;
> +
> +sysfs_create_fail:
> + kfree(data);
> +device_init_fail:
> + if (data->gpio)
> + free_irq(gpio_to_irq(data->gpio), data);
> +irq_request_fail:
> +als_register_fail:
> + if (data->flags & TSL2771_USE_ALS)
> + input_free_device(data->als_input_dev);
> +als_input_error:
> +prox_register_fail:
> + if (data->flags & TSL2771_USE_PROX)
> + input_free_device(data->prox_input_dev);
> +prox_input_error:
> + mutex_destroy(&data->enable_mutex);
> + kfree(data);
> +error:
> + return ret;
> +}
> +
> +static int __devexit tsl2771_driver_remove(struct i2c_client *client)
> +{
> + struct tsl2771_data *data = i2c_get_clientdata(client);
> + int ret = 0;
> +
> + sysfs_remove_group(&client->dev.kobj, &tsl2771_attr_group);
> +
> + if (data->gpio)
> + free_irq(gpio_to_irq(data->gpio), data);
> +
> + if (data->prox_input_dev)
> + input_free_device(data->prox_input_dev);
> +
> + if (data->als_input_dev)
> + input_free_device(data->als_input_dev);
> +
> + i2c_set_clientdata(client, NULL);
> + mutex_destroy(&data->enable_mutex);
> + kfree(data);
> +
> + return ret;
> +}
> +
> +#ifdef CONFIG_PM
> +static int tsl2771_driver_suspend(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct tsl2771_data *data = platform_get_drvdata(pdev);
> +
> + data->power_context = data->power_state;
> + if (data->power_state & 0x2) {
> + if (als_prox_debug & 0x4)
> + pr_info("%s:Prox was enabled into suspend\n", __func__);
> + } else
> + tsl2771_prox_enable(data, 0);
> +
> + tsl2771_als_enable(data, 0);
> +
> + return 0;
> +}
> +
> +static int tsl2771_driver_resume(struct device *dev)
> +{
> + struct platform_device *pdev = to_platform_device(dev);
> + struct tsl2771_data *data = platform_get_drvdata(pdev);
> +
> + if (data->power_context & 0x2) {
> + if (als_prox_debug & 0x4)
> + pr_info("%s:Prox was enabled into suspend\n", __func__);
> + } else
> + tsl2771_prox_enable(data, 1);
> +
> + if (data->power_context & 0x1) {
> + if (als_prox_debug & 0x4)
> + pr_info("%s:ALS was enabled\n", __func__);
> + tsl2771_als_enable(data, 1);
> + }
> +
> + return 0;
> +}
> +
> +static const struct dev_pm_ops tsl2771_pm_ops = {
> + .suspend = tsl2771_driver_suspend,
> + .resume = tsl2771_driver_resume,
> +};
> +#endif
> +
> +static const struct i2c_device_id tsl2771_idtable[] = {
> + { TSL2771_NAME, 0 },
> + { },
> +};
> +MODULE_DEVICE_TABLE(i2c, tsl2771_idtable);
> +
> +static const struct of_device_id tsl2771_dt_match[] = {
> + { .compatible = "tsl2771,alps"},
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, tsl2771_dt_match);
> +
> +static struct i2c_driver tsl2771_driver = {
> + .probe = tsl2771_driver_probe,
> + .remove = tsl2771_driver_remove,
> + .id_table = tsl2771_idtable,
> + .driver = {
> + .name = TSL2771_NAME,
> +#ifdef CONFIG_PM
> + .pm = &tsl2771_pm_ops,
> +#endif
> + .of_match_table = of_match_ptr(tsl2771_dt_match),
> + },
> +};
> +
> +static int __init tsl2771_driver_init(void)
> +{
> + return i2c_add_driver(&tsl2771_driver);
> +}
> +
> +static void __exit tsl2771_driver_exit(void)
> +{
> + i2c_del_driver(&tsl2771_driver);
> +}
> +
> +module_init(tsl2771_driver_init);
> +module_exit(tsl2771_driver_exit);
> +
> +MODULE_DESCRIPTION("TSL2771 ALS/Prox Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Dan Murphy <DMurphy@...com>");
> diff --git a/include/linux/i2c/tsl2771.h b/include/linux/i2c/tsl2771.h
> new file mode 100644
> index 0000000..79e4328
> --- /dev/null
> +++ b/include/linux/i2c/tsl2771.h
> @@ -0,0 +1,71 @@
> +/*
> + * tsl2771.h
> + * TSL2771 ALS and Proximity driver
> + *
> + * Copyright (C) 2011 Texas Instruments
> + * Author: Dan Murphy <DMurphy@...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, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _LINUX_TSL2771_I2C_H
> +#define _LINUX_TSL2771_I2C_H
> +
> +#define TSL2771_NAME "tsl2771"
> +
> +/* TSL2771 Read/Write registers */
> +#define TSL2771_ENABLE 0x00
> +#define TSL2771_ATIME 0x01
> +#define TSL2771_PTIME 0x02
> +#define TSL2771_WTIME 0x03
> +#define TSL2771_AILTL 0x04
> +#define TSL2771_AILTH 0x05
> +#define TSL2771_AIHTL 0x06
> +#define TSL2771_AIHTH 0x07
> +#define TSL2771_PILTL 0x08
> +#define TSL2771_PILTH 0x09
> +#define TSL2771_PIHTL 0x0a
> +#define TSL2771_PIHTH 0x0b
> +#define TSL2771_PERS 0x0c
> +#define TSL2771_CONFIG 0x0d
> +#define TSL2771_PPCOUNT 0x0e
> +#define TSL2771_CONTROL 0x0f
> +
> +#define TSL2771_USE_ALS (1 << 0)
> +#define TSL2771_USE_PROX (1 << 1)
> +
> +struct tsl2771_platform_data {
> + int irq_flags;
> + int flags;
> + int glass_attn;
> + int device_factor;
> +
> + uint8_t def_enable;
> + uint8_t als_adc_time;
> + uint8_t prox_adc_time;
> + uint8_t wait_time;
> + uint8_t als_low_thresh_low_byte;
> + uint8_t als_low_thresh_high_byte;
> + uint8_t als_high_thresh_low_byte;
> + uint8_t als_high_thresh_high_byte;
> + uint8_t prox_low_thresh_low_byte;
> + uint8_t prox_low_thresh_high_byte;
> + uint8_t prox_high_thresh_low_byte;
> + uint8_t prox_high_thresh_high_byte;
> + uint8_t interrupt_persistence;
> + uint8_t config;
> + uint8_t prox_pulse_count;
> + uint8_t gain_control;
> +};
> +
> +#endif
> --
> 1.7.1
>
Gentle Ping on this..
~Sourav
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