[PATCH] Input: tsl2771: ambient light and proximity driver
From: Sourav Poddar
Date: Tue Jun 05 2012 - 06:32:12 EST
From: Dan Murphy <DMurphy@xxxxxx>
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@xxxxxx>
Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
Cc: Felipe Balbi <balbi@xxxxxx>
Cc: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
Cc: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxx>
Cc: Ashish Jangam <ashish.jangam@xxxxxxxxxxxxxxx>
Cc: Anirudh Ghayal <aghayal@xxxxxxxxxxxxxx>
Signed-off-by: Dan Murphy <DMurphy@xxxxxx>
Signed-off-by: Sourav Poddar <sourav.poddar@xxxxxx>
[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@xxxxxx>
+ *
+ * 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@xxxxxx>");
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@xxxxxx>
+ *
+ * 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
--
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