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/*
* Copyright (c) 2015 Intel Corporation
*
* Driver for UPISEMI us5182d Proximity and Ambient Light Sensor.
*
* 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 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.
*
* To do: Interrupt support.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#define US5182D_REG_CFG0 0x00
#define US5182D_CFG0_ONESHOT_EN BIT(6)
#define US5182D_CFG0_SHUTDOWN_EN BIT(7)
#define US5182D_CFG0_WORD_ENABLE BIT(0)
#define US5182D_REG_CFG1 0x01
#define US5182D_CFG1_ALS_RES16 BIT(4)
#define US5182D_CFG1_AGAIN_DEFAULT 0x00
#define US5182D_REG_CFG2 0x02
#define US5182D_CFG2_PX_RES16 BIT(4)
#define US5182D_CFG2_PXGAIN_DEFAULT BIT(2)
#define US5182D_REG_CFG3 0x03
#define US5182D_CFG3_LED_CURRENT100 (BIT(4) | BIT(5))
#define US5182D_REG_CFG4 0x10
/*
* Registers for tuning the auto dark current cancelling feature.
* DARK_TH(reg 0x27,0x28) - threshold (counts) for auto dark cancelling.
* when ALS > DARK_TH --> ALS_Code = ALS - Upper(0x2A) * Dark
* when ALS < DARK_TH --> ALS_Code = ALS - Lower(0x29) * Dark
*/
#define US5182D_REG_UDARK_TH 0x27
#define US5182D_REG_DARK_AUTO_EN 0x2b
#define US5182D_REG_AUTO_LDARK_GAIN 0x29
#define US5182D_REG_AUTO_HDARK_GAIN 0x2a
#define US5182D_OPMODE_ALS 0x01
#define US5182D_OPMODE_PX 0x02
#define US5182D_OPMODE_SHIFT 4
#define US5182D_REG_DARK_AUTO_EN_DEFAULT 0x80
#define US5182D_REG_AUTO_LDARK_GAIN_DEFAULT 0x16
#define US5182D_REG_AUTO_HDARK_GAIN_DEFAULT 0x00
#define US5182D_REG_ADL 0x0c
#define US5182D_REG_PDL 0x0e
#define US5182D_REG_MODE_STORE 0x21
#define US5182D_STORE_MODE 0x01
#define US5182D_REG_CHIPID 0xb2
#define US5182D_OPMODE_MASK GENMASK(5, 4)
#define US5182D_AGAIN_MASK 0x07
#define US5182D_RESET_CHIP 0x01
#define US5182D_CHIPID 0x26
#define US5182D_DRV_NAME "us5182d"
#define US5182D_GA_RESOLUTION 1000
#define US5182D_READ_BYTE 1
#define US5182D_READ_WORD 2
#define US5182D_OPSTORE_SLEEP_TIME 20 /* ms */
#define US5182D_SLEEP_MS 3000 /* ms */
/* Available ranges: [12354, 7065, 3998, 2202, 1285, 498, 256, 138] lux */
static const int us5182d_scales[] = {188500, 107800, 61000, 33600, 19600, 7600,
3900, 2100};
/*
* Experimental thresholds that work with US5182D sensor on evaluation board
* roughly between 12-32 lux
*/
static u16 us5182d_dark_ths_vals[] = {170, 200, 512, 512, 800, 2000, 4000,
8000};
enum mode {
US5182D_ALS_PX,
US5182D_ALS_ONLY,
US5182D_PX_ONLY
};
enum pmode {
US5182D_CONTINUOUS,
US5182D_ONESHOT
};
struct us5182d_data {
struct i2c_client *client;
struct mutex lock;
/* Glass attenuation factor */
u32 ga;
/* Dark gain tuning */
u8 lower_dark_gain;
u8 upper_dark_gain;
u16 *us5182d_dark_ths;
u8 opmode;
u8 power_mode;
bool als_enabled;
bool px_enabled;
bool default_continuous;
};
static IIO_CONST_ATTR(in_illuminance_scale_available,
"0.0021 0.0039 0.0076 0.0196 0.0336 0.061 0.1078 0.1885");
static struct attribute *us5182d_attrs[] = {
&iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
NULL
};
static const struct attribute_group us5182d_attr_group = {
.attrs = us5182d_attrs,
};
static const struct {
u8 reg;
u8 val;
} us5182d_regvals[] = {
{US5182D_REG_CFG0, US5182D_CFG0_WORD_ENABLE},
{US5182D_REG_CFG1, US5182D_CFG1_ALS_RES16},
{US5182D_REG_CFG2, (US5182D_CFG2_PX_RES16 |
US5182D_CFG2_PXGAIN_DEFAULT)},
{US5182D_REG_CFG3, US5182D_CFG3_LED_CURRENT100},
{US5182D_REG_CFG4, 0x00},
};
static const struct iio_chan_spec us5182d_channels[] = {
{
.type = IIO_LIGHT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE),
},
{
.type = IIO_PROXIMITY,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
}
};
static int us5182d_get_als(struct us5182d_data *data)
{
int ret;
unsigned long result;
ret = i2c_smbus_read_word_data(data->client,
US5182D_REG_ADL);
if (ret < 0)
return ret;
result = ret * data->ga / US5182D_GA_RESOLUTION;
if (result > 0xffff)
result = 0xffff;
return result;
}
static int us5182d_oneshot_en(struct us5182d_data *data)
{
int ret;
ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
if (ret < 0)
return ret;
/*
* In oneshot mode the chip will power itself down after taking the
* required measurement.
*/
ret = ret | US5182D_CFG0_ONESHOT_EN;
return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
}
static int us5182d_set_opmode(struct us5182d_data *data, u8 mode)
{
int ret;
if (mode == data->opmode)
return 0;
ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
if (ret < 0)
return ret;
/* update mode */
ret = ret & ~US5182D_OPMODE_MASK;
ret = ret | (mode << US5182D_OPMODE_SHIFT);
/*
* After updating the operating mode, the chip requires that
* the operation is stored, by writing 1 in the STORE_MODE
* register (auto-clearing).
*/
ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_MODE_STORE,
US5182D_STORE_MODE);
if (ret < 0)
return ret;
data->opmode = mode;
msleep(US5182D_OPSTORE_SLEEP_TIME);
return 0;
}
static int us5182d_als_enable(struct us5182d_data *data)
{
int ret;
u8 mode;
if (data->power_mode == US5182D_ONESHOT)
return us5182d_set_opmode(data, US5182D_ALS_ONLY);
if (data->als_enabled)
return 0;
mode = data->px_enabled ? US5182D_ALS_PX : US5182D_ALS_ONLY;
ret = us5182d_set_opmode(data, mode);
if (ret < 0)
return ret;
data->als_enabled = true;
return 0;
}
static int us5182d_px_enable(struct us5182d_data *data)
{
int ret;
u8 mode;
if (data->power_mode == US5182D_ONESHOT)
return us5182d_set_opmode(data, US5182D_PX_ONLY);
if (data->px_enabled)
return 0;
mode = data->als_enabled ? US5182D_ALS_PX : US5182D_PX_ONLY;
ret = us5182d_set_opmode(data, mode);
if (ret < 0)
return ret;
data->px_enabled = true;
return 0;
}
static int us5182d_shutdown_en(struct us5182d_data *data, u8 state)
{
int ret;
if (data->power_mode == US5182D_ONESHOT)
return 0;
ret = i2c_smbus_read_byte_data(data->client, US5182D_REG_CFG0);
if (ret < 0)
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