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iio: light: Add support for UPISEMI uS5182d als and proximity sensor
Add support for UPISEMI us5182d als and proximity sensor. Supports raw readings. Data sheet for this device can be found here: http://www.upi-semi.com/temp/uS5182D-DS-P0103-temp.pdf Signed-off-by: Adriana Reus <adriana.reus@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Adriana Reus
Jonathan Cameron
parent
fd2bb310ca
commit
c14f8abe53
@ -300,6 +300,16 @@ config TSL4531
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To compile this driver as a module, choose M here: the
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module will be called tsl4531.
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config US5182D
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tristate "UPISEMI light and proximity sensor"
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depends on I2C
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help
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If you say yes here you get support for the UPISEMI US5182D
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ambient light and proximity sensor.
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This driver can also be built as a module. If so, the module
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will be called us5182d.
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config VCNL4000
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tristate "VCNL4000 combined ALS and proximity sensor"
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depends on I2C
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@ -28,4 +28,5 @@ obj-$(CONFIG_STK3310) += stk3310.o
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obj-$(CONFIG_TCS3414) += tcs3414.o
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obj-$(CONFIG_TCS3472) += tcs3472.o
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obj-$(CONFIG_TSL4531) += tsl4531.o
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obj-$(CONFIG_US5182D) += us5182d.o
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obj-$(CONFIG_VCNL4000) += vcnl4000.o
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507
drivers/iio/light/us5182d.c
Normal file
507
drivers/iio/light/us5182d.c
Normal file
@ -0,0 +1,507 @@
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/*
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* Copyright (c) 2015 Intel Corporation
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*
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* Driver for UPISEMI us5182d Proximity and Ambient Light Sensor.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* To do: Interrupt support.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/acpi.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/mutex.h>
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#define US5182D_REG_CFG0 0x00
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#define US5182D_CFG0_ONESHOT_EN BIT(6)
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#define US5182D_CFG0_SHUTDOWN_EN BIT(7)
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#define US5182D_CFG0_WORD_ENABLE BIT(0)
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#define US5182D_REG_CFG1 0x01
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#define US5182D_CFG1_ALS_RES16 BIT(4)
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#define US5182D_CFG1_AGAIN_DEFAULT 0x00
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#define US5182D_REG_CFG2 0x02
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#define US5182D_CFG2_PX_RES16 BIT(4)
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#define US5182D_CFG2_PXGAIN_DEFAULT BIT(2)
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#define US5182D_REG_CFG3 0x03
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#define US5182D_CFG3_LED_CURRENT100 (BIT(4) | BIT(5))
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#define US5182D_REG_CFG4 0x10
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/*
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* Registers for tuning the auto dark current cancelling feature.
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* DARK_TH(reg 0x27,0x28) - threshold (counts) for auto dark cancelling.
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* when ALS > DARK_TH --> ALS_Code = ALS - Upper(0x2A) * Dark
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* when ALS < DARK_TH --> ALS_Code = ALS - Lower(0x29) * Dark
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*/
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#define US5182D_REG_UDARK_TH 0x27
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#define US5182D_REG_DARK_AUTO_EN 0x2b
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#define US5182D_REG_AUTO_LDARK_GAIN 0x29
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#define US5182D_REG_AUTO_HDARK_GAIN 0x2a
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#define US5182D_OPMODE_ALS 0x01
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#define US5182D_OPMODE_PX 0x02
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#define US5182D_OPMODE_SHIFT 4
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#define US5182D_REG_DARK_AUTO_EN_DEFAULT 0x80
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#define US5182D_REG_AUTO_LDARK_GAIN_DEFAULT 0x16
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#define US5182D_REG_AUTO_HDARK_GAIN_DEFAULT 0x00
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#define US5182D_REG_ADL 0x0c
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#define US5182D_REG_PDL 0x0e
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#define US5182D_REG_MODE_STORE 0x21
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#define US5182D_STORE_MODE 0x01
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#define US5182D_REG_CHIPID 0xb2
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#define US5182D_OPMODE_MASK GENMASK(5, 4)
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#define US5182D_AGAIN_MASK 0x07
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#define US5182D_RESET_CHIP 0x01
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#define US5182D_CHIPID 0x26
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#define US5182D_DRV_NAME "us5182d"
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#define US5182D_GA_RESOLUTION 1000
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#define US5182D_READ_BYTE 1
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#define US5182D_READ_WORD 2
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#define US5182D_OPSTORE_SLEEP_TIME 20 /* ms */
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/* Available ranges: [12354, 7065, 3998, 2202, 1285, 498, 256, 138] lux */
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static const int us5182d_scales[] = {188500, 107800, 61000, 33600, 19600, 7600,
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3900, 2100};
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/*
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* Experimental thresholds that work with US5182D sensor on evaluation board
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* roughly between 12-32 lux
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*/
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static u16 us5182d_dark_ths_vals[] = {170, 200, 512, 512, 800, 2000, 4000,
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8000};
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enum mode {
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US5182D_ALS_PX,
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US5182D_ALS_ONLY,
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US5182D_PX_ONLY
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};
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struct us5182d_data {
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struct i2c_client *client;
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struct mutex lock;
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/* Glass attenuation factor */
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u32 ga;
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/* Dark gain tuning */
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u8 lower_dark_gain;
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u8 upper_dark_gain;
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u16 *us5182d_dark_ths;
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u8 opmode;
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};
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static IIO_CONST_ATTR(in_illuminance_scale_available,
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"0.0021 0.0039 0.0076 0.0196 0.0336 0.061 0.1078 0.1885");
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static struct attribute *us5182d_attrs[] = {
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&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group us5182d_attr_group = {
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.attrs = us5182d_attrs,
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};
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static const struct {
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u8 reg;
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u8 val;
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} us5182d_regvals[] = {
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{US5182D_REG_CFG0, (US5182D_CFG0_SHUTDOWN_EN |
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US5182D_CFG0_WORD_ENABLE)},
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{US5182D_REG_CFG1, US5182D_CFG1_ALS_RES16},
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{US5182D_REG_CFG2, (US5182D_CFG2_PX_RES16 |
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US5182D_CFG2_PXGAIN_DEFAULT)},
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{US5182D_REG_CFG3, US5182D_CFG3_LED_CURRENT100},
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{US5182D_REG_MODE_STORE, US5182D_STORE_MODE},
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{US5182D_REG_CFG4, 0x00},
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};
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static const struct iio_chan_spec us5182d_channels[] = {
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{
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.type = IIO_LIGHT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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},
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{
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.type = IIO_PROXIMITY,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}
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};
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static int us5182d_get_als(struct us5182d_data *data)
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{
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int ret;
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unsigned long result;
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ret = i2c_smbus_read_word_data(data->client,
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US5182D_REG_ADL);
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if (ret < 0)
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return ret;
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result = ret * data->ga / US5182D_GA_RESOLUTION;
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if (result > 0xffff)
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result = 0xffff;
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return result;
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}
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static int us5182d_set_opmode(struct us5182d_data *data, u8 mode)
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{
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int ret;
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ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
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if (ret < 0)
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return ret;
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/*
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* In oneshot mode the chip will power itself down after taking the
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* required measurement.
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*/
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ret = ret | US5182D_CFG0_ONESHOT_EN;
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/* update mode */
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ret = ret & ~US5182D_OPMODE_MASK;
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ret = ret | (mode << US5182D_OPMODE_SHIFT);
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/*
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* After updating the operating mode, the chip requires that
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* the operation is stored, by writing 1 in the STORE_MODE
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* register (auto-clearing).
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*/
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ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
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if (ret < 0)
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return ret;
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if (mode == data->opmode)
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return 0;
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ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_MODE_STORE,
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US5182D_STORE_MODE);
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if (ret < 0)
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return ret;
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data->opmode = mode;
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msleep(US5182D_OPSTORE_SLEEP_TIME);
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return 0;
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}
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static int us5182d_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val,
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int *val2, long mask)
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{
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struct us5182d_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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switch (chan->type) {
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case IIO_LIGHT:
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mutex_lock(&data->lock);
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ret = us5182d_set_opmode(data, US5182D_OPMODE_ALS);
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if (ret < 0)
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goto out_err;
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ret = us5182d_get_als(data);
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if (ret < 0)
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goto out_err;
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mutex_unlock(&data->lock);
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*val = ret;
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return IIO_VAL_INT;
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case IIO_PROXIMITY:
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mutex_lock(&data->lock);
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ret = us5182d_set_opmode(data, US5182D_OPMODE_PX);
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if (ret < 0)
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goto out_err;
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ret = i2c_smbus_read_word_data(data->client,
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US5182D_REG_PDL);
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if (ret < 0)
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goto out_err;
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mutex_unlock(&data->lock);
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*val = ret;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_SCALE:
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ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1);
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if (ret < 0)
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return ret;
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*val = 0;
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*val2 = us5182d_scales[ret & US5182D_AGAIN_MASK];
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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return -EINVAL;
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out_err:
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mutex_unlock(&data->lock);
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return ret;
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}
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/**
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* us5182d_update_dark_th - update Darh_Th registers
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* @data us5182d_data structure
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* @index index in us5182d_dark_ths array to use for the updated value
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*
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* Function needs to be called with a lock held because it needs two i2c write
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* byte operations as these registers (0x27 0x28) don't work in word mode
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* accessing.
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*/
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static int us5182d_update_dark_th(struct us5182d_data *data, int index)
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{
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__be16 dark_th = cpu_to_be16(data->us5182d_dark_ths[index]);
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int ret;
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ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_UDARK_TH,
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((u8 *)&dark_th)[0]);
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if (ret < 0)
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return ret;
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return i2c_smbus_write_byte_data(data->client, US5182D_REG_UDARK_TH + 1,
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((u8 *)&dark_th)[1]);
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}
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/**
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* us5182d_apply_scale - update the ALS scale
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* @data us5182d_data structure
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* @index index in us5182d_scales array to use for the updated value
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*
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* Function needs to be called with a lock held as we're having more than one
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* i2c operation.
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*/
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static int us5182d_apply_scale(struct us5182d_data *data, int index)
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{
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int ret;
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ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG1);
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if (ret < 0)
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return ret;
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ret = ret & (~US5182D_AGAIN_MASK);
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ret |= index;
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ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG1, ret);
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if (ret < 0)
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return ret;
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return us5182d_update_dark_th(data, index);
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}
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static int us5182d_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int val,
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int val2, long mask)
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{
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struct us5182d_data *data = iio_priv(indio_dev);
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int ret, i;
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switch (mask) {
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case IIO_CHAN_INFO_SCALE:
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if (val != 0)
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return -EINVAL;
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for (i = 0; i < ARRAY_SIZE(us5182d_scales); i++)
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if (val2 == us5182d_scales[i]) {
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mutex_lock(&data->lock);
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ret = us5182d_apply_scale(data, i);
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mutex_unlock(&data->lock);
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return ret;
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}
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break;
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default:
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return -EINVAL;
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}
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return -EINVAL;
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}
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static const struct iio_info us5182d_info = {
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.driver_module = THIS_MODULE,
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.read_raw = us5182d_read_raw,
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.write_raw = us5182d_write_raw,
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.attrs = &us5182d_attr_group,
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};
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static int us5182d_reset(struct iio_dev *indio_dev)
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{
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struct us5182d_data *data = iio_priv(indio_dev);
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return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG3,
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US5182D_RESET_CHIP);
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}
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static int us5182d_init(struct iio_dev *indio_dev)
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{
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struct us5182d_data *data = iio_priv(indio_dev);
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int i, ret;
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ret = us5182d_reset(indio_dev);
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if (ret < 0)
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return ret;
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data->opmode = 0;
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for (i = 0; i < ARRAY_SIZE(us5182d_regvals); i++) {
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ret = i2c_smbus_write_byte_data(data->client,
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us5182d_regvals[i].reg,
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us5182d_regvals[i].val);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static void us5182d_get_platform_data(struct iio_dev *indio_dev)
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{
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struct us5182d_data *data = iio_priv(indio_dev);
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if (device_property_read_u32(&data->client->dev, "upisemi,glass-coef",
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&data->ga))
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data->ga = US5182D_GA_RESOLUTION;
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if (device_property_read_u16_array(&data->client->dev,
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"upisemi,dark-ths",
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data->us5182d_dark_ths,
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ARRAY_SIZE(us5182d_dark_ths_vals)))
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data->us5182d_dark_ths = us5182d_dark_ths_vals;
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if (device_property_read_u8(&data->client->dev,
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"upisemi,upper-dark-gain",
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&data->upper_dark_gain))
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data->upper_dark_gain = US5182D_REG_AUTO_HDARK_GAIN_DEFAULT;
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if (device_property_read_u8(&data->client->dev,
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"upisemi,lower-dark-gain",
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&data->lower_dark_gain))
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data->lower_dark_gain = US5182D_REG_AUTO_LDARK_GAIN_DEFAULT;
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}
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static int us5182d_dark_gain_config(struct iio_dev *indio_dev)
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{
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struct us5182d_data *data = iio_priv(indio_dev);
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int ret;
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ret = us5182d_update_dark_th(data, US5182D_CFG1_AGAIN_DEFAULT);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_write_byte_data(data->client,
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US5182D_REG_AUTO_LDARK_GAIN,
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data->lower_dark_gain);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_write_byte_data(data->client,
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US5182D_REG_AUTO_HDARK_GAIN,
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data->upper_dark_gain);
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if (ret < 0)
|
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return ret;
|
||||
|
||||
return i2c_smbus_write_byte_data(data->client, US5182D_REG_DARK_AUTO_EN,
|
||||
US5182D_REG_DARK_AUTO_EN_DEFAULT);
|
||||
}
|
||||
|
||||
static int us5182d_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct us5182d_data *data;
|
||||
struct iio_dev *indio_dev;
|
||||
int ret;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
||||
if (!indio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
data = iio_priv(indio_dev);
|
||||
i2c_set_clientdata(client, indio_dev);
|
||||
data->client = client;
|
||||
|
||||
mutex_init(&data->lock);
|
||||
|
||||
indio_dev->dev.parent = &client->dev;
|
||||
indio_dev->info = &us5182d_info;
|
||||
indio_dev->name = US5182D_DRV_NAME;
|
||||
indio_dev->channels = us5182d_channels;
|
||||
indio_dev->num_channels = ARRAY_SIZE(us5182d_channels);
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
|
||||
ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CHIPID);
|
||||
if (ret != US5182D_CHIPID) {
|
||||
dev_err(&data->client->dev,
|
||||
"Failed to detect US5182 light chip\n");
|
||||
return (ret < 0) ? ret : -ENODEV;
|
||||
}
|
||||
|
||||
us5182d_get_platform_data(indio_dev);
|
||||
ret = us5182d_init(indio_dev);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = us5182d_dark_gain_config(indio_dev);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
return iio_device_register(indio_dev);
|
||||
}
|
||||
|
||||
static int us5182d_remove(struct i2c_client *client)
|
||||
{
|
||||
iio_device_unregister(i2c_get_clientdata(client));
|
||||
return i2c_smbus_write_byte_data(client, US5182D_REG_CFG0,
|
||||
US5182D_CFG0_SHUTDOWN_EN);
|
||||
}
|
||||
|
||||
static const struct acpi_device_id us5182d_acpi_match[] = {
|
||||
{ "USD5182", 0},
|
||||
{}
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(acpi, us5182d_acpi_match);
|
||||
|
||||
static const struct i2c_device_id us5182d_id[] = {
|
||||
{"usd5182", 0},
|
||||
{}
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(i2c, us5182d_id);
|
||||
|
||||
static struct i2c_driver us5182d_driver = {
|
||||
.driver = {
|
||||
.name = US5182D_DRV_NAME,
|
||||
.acpi_match_table = ACPI_PTR(us5182d_acpi_match),
|
||||
},
|
||||
.probe = us5182d_probe,
|
||||
.remove = us5182d_remove,
|
||||
.id_table = us5182d_id,
|
||||
|
||||
};
|
||||
module_i2c_driver(us5182d_driver);
|
||||
|
||||
MODULE_AUTHOR("Adriana Reus <adriana.reus@intel.com>");
|
||||
MODULE_DESCRIPTION("Driver for us5182d Proximity and Light Sensor");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user