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tegrakernel/kernel/nvidia/drivers/iio/light/nvs_ltr659.c

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/* Copyright (c) 2014-2017, NVIDIA CORPORATION. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*/
/* The NVS = NVidia Sensor framework */
/* See nvs_iio.c and nvs.h for documentation */
/* See nvs_light.c and nvs_light.h for documentation */
/* See nvs_proximity.c and nvs_proximity.h for documentation */
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/regulator/consumer.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/of.h>
#include <linux/nvs.h>
#include <linux/nvs_light.h>
#include <linux/nvs_proximity.h>
#define LTR_DRIVER_VERSION (3)
#define LTR_VENDOR "Lite-On Technology Corp."
#define LTR_NAME "ltrX5X"
#define LTR_NAME_LTR558ALS "ltr558als"
#define LTR_NAME_LTR659PS "ltr659ps"
#define LTR_DEVID_558ALS (0x80)
#define LTR_DEVID_659PS (0x90)
#define LTR_HW_DELAY_MS (600)
#define LTR_WAKEUP_DELAY_MS (10)
#define LTR_POLL_DLY_MS_DFLT (2000)
#define LTR_POLL_DLY_MS_MIN (100)
#define LTR_POLL_DLY_MS_MAX (60000)
#define LTR_REG_PS_CONTR_DFLT (0x00)
#define LTR_REG_PS_LED_DFLT (0x04)
#define LTR_REG_PS_N_PULSES_DFLT (0x7F)
#define LTR_REG_PS_MEAS_RATE_DFLT (0x05)
#define LTR_REG_ALS_MEAS_RATE_DFLT (0x04)
#define LTR_REG_INTERRUPT_PERSIST_DFLT (0x00)
/* light defines */
#define LTR_LIGHT_VERSION (1)
#define LTR_LIGHT_MAX_RANGE_IVAL (14323)
#define LTR_LIGHT_MAX_RANGE_MICRO (0)
#define LTR_LIGHT_RESOLUTION_IVAL (0)
#define LTR_LIGHT_RESOLUTION_MICRO (14000)
#define LTR_LIGHT_MILLIAMP_IVAL (0)
#define LTR_LIGHT_MILLIAMP_MICRO (13500)
#define LTR_LIGHT_SCALE_IVAL (0)
#define LTR_LIGHT_SCALE_MICRO (10000)
#define LTR_LIGHT_THRESHOLD_DFLT (50)
/* proximity defines */
#define LTR_PROX_THRESHOLD_LO (1000)
#define LTR_PROX_THRESHOLD_HI (2000)
#define LTR_PROX_VERSION (1)
/* setting max_range and resolution to 1.0 = binary proximity */
#define LTR_PROX_MAX_RANGE_IVAL (1)
#define LTR_PROX_MAX_RANGE_MICRO (0)
#define LTR_PROX_RESOLUTION_IVAL (1)
#define LTR_PROX_RESOLUTION_MICRO (0)
#define LTR_PROX_MILLIAMP_IVAL (10)
#define LTR_PROX_MILLIAMP_MICRO (250000)
#define LTR_PROX_SCALE_IVAL (0)
#define LTR_PROX_SCALE_MICRO (0)
#define LTR_PROX_OFFSET_IVAL (0)
#define LTR_PROX_OFFSET_MICRO (0)
/* HW registers */
#define LTR_REG_ALS_CONTR (0x80)
#define LTR_REG_ALS_CONTR_MODE (1)
#define LTR_REG_ALS_CONTR_SW_RESET (2)
#define LTR_REG_ALS_CONTR_GAIN (3)
#define LTR_REG_PS_CONTR (0x81)
#define LTR_REG_PS_CONTR_MODE (1)
#define LTR_REG_PS_CONTR_GAIN (2)
#define LTR_REG_PS_CONTR_SAT_EN (5)
#define LTR_REG_PS_CONTR_POR_MASK (0x2C)
#define LTR_REG_PS_LED (0x82)
#define LTR_REG_PS_N_PULSES (0x83)
#define LTR_REG_PS_MEAS_RATE (0x84)
#define LTR_REG_ALS_MEAS_RATE (0x85)
#define LTR_REG_PART_ID (0x86)
#define LTR_REG_PART_ID_MASK (0xF0)
#define LTR_REG_MANUFAC_ID (0x87)
#define LTR_REG_MANUFAC_ID_VAL (0x05)
#define LTR_REG_ALS_DATA_CH1_0 (0x88)
#define LTR_REG_ALS_DATA_CH1_1 (0x89)
#define LTR_REG_ALS_DATA_CH0_0 (0x8A)
#define LTR_REG_ALS_DATA_CH0_1 (0x8B)
#define LTR_REG_STATUS (0x8C)
#define LTR_REG_STATUS_DATA_PS (0)
#define LTR_REG_STATUS_IRQ_PS (1)
#define LTR_REG_STATUS_DATA_ALS (2)
#define LTR_REG_STATUS_IRQ_ALS (3)
#define LTR_REG_STATUS_DATA_MASK (0x05)
#define LTR_REG_PS_DATA_0 (0x8D)
#define LTR_REG_PS_DATA_1 (0x8E)
#define LTR_REG_PS_DATA_MASK (0x07FF)
#define LTR_REG_PS_DATA_SAT (15)
#define LTR_REG_INTERRUPT (0x8F)
#define LTR_REG_INTERRUPT_PS_EN (0)
#define LTR_REG_INTERRUPT_ALS_EN (1)
#define LTR_REG_INTERRUPT_MODE_MASK (0x03)
#define LTR_REG_INTERRUPT_POLARITY (2)
#define LTR_REG_PS_THRES_UP_0 (0x90)
#define LTR_REG_PS_THRES_UP_1 (0x91)
#define LTR_REG_PS_THRES_LOW_0 (0x92)
#define LTR_REG_PS_THRES_LOW_1 (0x93)
#define LTR_REG_PS_OFFSET_1 (0x94)
#define LTR_REG_PS_OFFSET_0 (0x95)
#define LTR_REG_ALS_THRES_UP_0 (0x97)
#define LTR_REG_ALS_THRES_UP_1 (0x98)
#define LTR_REG_ALS_THRES_LOW_0 (0x99)
#define LTR_REG_ALS_THRES_LOW_1 (0x9A)
#define LTR_REG_INTERRUPT_PERSIST (0x9E)
#define LTR_REG_INTERRUPT_PERSIST_MASK (0xF0)
/* devices */
#define LTR_DEV_LIGHT (0)
#define LTR_DEV_PROX (1)
#define LTR_DEV_N (2)
/* regulator names in order of powering on */
static char *ltr_vregs[] = {
"vdd",
"vled"
};
#define LTR_PM_ON (1)
#define LTR_PM_LED (ARRAY_SIZE(ltr_vregs))
static u8 ltr_ids[] = {
LTR_DEVID_558ALS,
LTR_DEVID_659PS,
};
static unsigned short ltr_i2c_addrs[] = {
0x23,
};
static struct nvs_light_dynamic ltr_nld_tbl[] = {
{{0, 10000}, {327, 670000}, {0, 90000}, 100, 0},
{{2, 0}, {65534, 0}, {0, 90000}, 100, 0},
};
struct ltr_state {
struct i2c_client *i2c;
struct nvs_fn_if *nvs;
void *nvs_st[LTR_DEV_N];
struct sensor_cfg cfg[LTR_DEV_N];
struct workqueue_struct *wq;
struct work_struct ws;
struct regulator_bulk_data vreg[ARRAY_SIZE(ltr_vregs)];
struct nvs_light light;
struct nvs_proximity prox;
unsigned int sts; /* status flags */
unsigned int errs; /* error count */
unsigned int enabled; /* enable status */
bool irq_set_irq_wake; /* IRQ suspend active */
u16 i2c_addr; /* I2C address */
u8 dev_id; /* device ID */
u8 ps_contr; /* PS_CONTR register default */
u8 ps_led; /* PS_LED register default */
u8 ps_n_pulses; /* PS_N_PULSES register default */
u8 ps_meas_rate; /* PS_MEAS_RATE register default */
u8 als_meas_rate; /* ALS_CONTR register default */
u8 interrupt; /* INTERRUPT register default */
u8 interrupt_persist; /* INTERRUPT_PERSIST reg default */
u8 rc_als_contr; /* cache of ALS_CONTR */
u8 rc_ps_contr; /* cache of PS_CONTR */
u8 rc_interrupt; /* cache of INTERRUPT */
};
static void ltr_err(struct ltr_state *st)
{
st->errs++;
if (!st->errs)
st->errs--;
}
static void ltr_mutex_lock(struct ltr_state *st)
{
unsigned int i;
if (st->nvs) {
for (i = 0; i < LTR_DEV_N; i++) {
if (st->nvs_st[i])
st->nvs->nvs_mutex_lock(st->nvs_st[i]);
}
}
}
static void ltr_mutex_unlock(struct ltr_state *st)
{
unsigned int i;
if (st->nvs) {
for (i = 0; i < LTR_DEV_N; i++) {
if (st->nvs_st[i])
st->nvs->nvs_mutex_unlock(st->nvs_st[i]);
}
}
}
static int ltr_i2c_read(struct ltr_state *st, u8 reg, u16 len, u8 *val)
{
struct i2c_msg msg[2];
msg[0].addr = st->i2c_addr;
msg[0].flags = 0;
msg[0].len = 1;
msg[0].buf = &reg;
msg[1].addr = st->i2c_addr;
msg[1].flags = I2C_M_RD;
msg[1].len = len;
msg[1].buf = val;
if (i2c_transfer(st->i2c->adapter, msg, 2) != 2) {
ltr_err(st);
return -EIO;
}
return 0;
}
static int ltr_i2c_rd(struct ltr_state *st, u8 reg, u8 *val)
{
return ltr_i2c_read(st, reg, 1, val);
}
static int ltr_i2c_write(struct ltr_state *st, u16 len, u8 *buf)
{
struct i2c_msg msg;
if (st->i2c_addr) {
msg.addr = st->i2c_addr;
msg.flags = 0;
msg.len = len;
msg.buf = buf;
if (i2c_transfer(st->i2c->adapter, &msg, 1) != 1) {
ltr_err(st);
return -EIO;
}
}
return 0;
}
static int ltr_i2c_wr(struct ltr_state *st, u8 reg, u8 val)
{
u8 buf[2];
buf[0] = reg;
buf[1] = val;
return ltr_i2c_write(st, sizeof(buf), buf);
}
static int ltr_reset_sw(struct ltr_state *st)
{
u8 buf[5];
u8 reset;
int ret;
reset = 1 << LTR_REG_ALS_CONTR_SW_RESET;
if (st->dev_id == LTR_DEVID_659PS)
reset >>= 1;
ret = ltr_i2c_wr(st, LTR_REG_ALS_CONTR, reset);
if (!ret) {
mdelay(LTR_HW_DELAY_MS);
st->rc_als_contr = 0;
st->rc_ps_contr = 0;
st->rc_interrupt = 0;
}
buf[0] = LTR_REG_PS_LED;
buf[1] = st->ps_led;
buf[2] = st->ps_n_pulses;
buf[3] = st->ps_meas_rate;
buf[4] = st->als_meas_rate;
ret |= ltr_i2c_write(st, sizeof(buf), buf);
ret |= ltr_i2c_wr(st, LTR_REG_INTERRUPT_PERSIST,
st->interrupt_persist);
return ret;
}
static int ltr_pm(struct ltr_state *st, unsigned int en_msk)
{
unsigned int vreg_n;
unsigned int vreg_n_dis;
int ret = 0;
if (en_msk) {
if (en_msk & (1 << LTR_DEV_PROX))
vreg_n = LTR_PM_LED;
else
vreg_n = LTR_PM_ON;
ret = nvs_vregs_enable(&st->i2c->dev, st->vreg, vreg_n);
if (ret > 0)
mdelay(LTR_HW_DELAY_MS);
ret = ltr_reset_sw(st);
vreg_n_dis = ARRAY_SIZE(ltr_vregs) - vreg_n;
if (vreg_n_dis)
ret |= nvs_vregs_disable(&st->i2c->dev,
&st->vreg[vreg_n],
vreg_n_dis);
} else {
ret = nvs_vregs_sts(st->vreg, LTR_PM_ON);
if ((ret < 0) || (ret == LTR_PM_ON)) {
ret = ltr_i2c_wr(st, LTR_REG_ALS_CONTR, 0);
ret |= ltr_i2c_wr(st, LTR_REG_PS_CONTR, 0);
} else if (ret > 0) {
nvs_vregs_enable(&st->i2c->dev, st->vreg, LTR_PM_ON);
mdelay(LTR_HW_DELAY_MS);
ret = ltr_i2c_wr(st, LTR_REG_ALS_CONTR, 0);
ret |= ltr_i2c_wr(st, LTR_REG_PS_CONTR, 0);
}
ret |= nvs_vregs_disable(&st->i2c->dev, st->vreg,
ARRAY_SIZE(ltr_vregs));
}
if (ret > 0)
ret = 0;
if (ret) {
dev_err(&st->i2c->dev, "%s en_msk=%x ERR=%d\n",
__func__, en_msk, ret);
} else {
if (st->sts & NVS_STS_SPEW_MSG)
dev_info(&st->i2c->dev, "%s en_msk=%x\n",
__func__, en_msk);
}
return ret;
}
static void ltr_pm_exit(struct ltr_state *st)
{
ltr_pm(st, 0);
nvs_vregs_exit(&st->i2c->dev, st->vreg, ARRAY_SIZE(ltr_vregs));
}
static int ltr_pm_init(struct ltr_state *st)
{
int ret;
st->enabled = 0;
nvs_vregs_init(&st->i2c->dev,
st->vreg, ARRAY_SIZE(ltr_vregs), ltr_vregs);
ret = ltr_pm(st, (1 << LTR_DEV_N));
return ret;
}
static int ltr_interrupt_wr(struct ltr_state *st, u8 interrupt)
{
int ret = 0;
if (interrupt != st->interrupt) {
ret = ltr_i2c_wr(st, LTR_REG_INTERRUPT, interrupt);
if (st->sts & NVS_STS_SPEW_MSG)
dev_info(&st->i2c->dev, "%s irq %hhx->%hhx err=%d\n",
__func__, st->rc_interrupt, interrupt, ret);
if (!ret)
st->rc_interrupt = interrupt;
}
return ret;
}
static int ltr_cmd_wr(struct ltr_state *st, unsigned int enable, bool irq_en)
{
u8 interrupt;
u8 als_contr;
u8 ps_contr;
int ret;
int ret_t = 0;
if (enable & (1 << LTR_DEV_LIGHT)) {
als_contr = st->light.nld_i << LTR_REG_ALS_CONTR_GAIN;
als_contr |= 1 << LTR_REG_ALS_CONTR_MODE;
} else {
als_contr = 0;
}
if (st->rc_als_contr != als_contr) {
ret = ltr_i2c_wr(st, LTR_REG_ALS_CONTR, als_contr);
if (ret)
ret_t |= ret;
else
st->rc_als_contr = als_contr;
}
ps_contr = st->ps_contr;
if (enable & (1 << LTR_DEV_PROX))
ps_contr |= 1 << LTR_REG_PS_CONTR_MODE;
if (st->rc_ps_contr != ps_contr) {
ret = ltr_i2c_wr(st, LTR_REG_PS_CONTR, ps_contr);
if (ret)
ret_t |= ret;
else
st->rc_ps_contr = ps_contr;
}
if (st->i2c->irq > 0) {
interrupt = st->interrupt;
if (irq_en) {
if (enable & (1 << LTR_DEV_LIGHT))
interrupt |= (1 << LTR_REG_INTERRUPT_ALS_EN);
if (enable & (1 << LTR_DEV_PROX))
interrupt |= (1 << LTR_REG_INTERRUPT_PS_EN);
}
ret_t |= ltr_interrupt_wr(st, interrupt);
}
if ((st->rc_interrupt & LTR_REG_INTERRUPT_MODE_MASK) && !ret_t)
ret_t = 1; /* flag IRQ enabled */
if (st->sts & NVS_STS_SPEW_MSG)
dev_info(&st->i2c->dev, "%s als=%hhx ps=%hhx ret=%d\n",
__func__, st->rc_als_contr, st->rc_ps_contr, ret_t);
return ret_t;
}
static int ltr_thr_wr(struct ltr_state *st, u8 reg, u16 thr_lo, u16 thr_hi)
{
u8 buf[5];
int ret;
ret = ltr_interrupt_wr(st, st->interrupt); /* irq disable */
if (st->i2c->irq > 0) {
buf[0] = reg;
buf[1] = thr_hi & 0xFF;
buf[2] = thr_hi >> 8;
buf[3] = thr_lo & 0xFF;
buf[4] = thr_lo >> 8;
ret |= ltr_i2c_write(st, sizeof(buf), buf);
if (st->sts & NVS_STS_SPEW_MSG)
dev_info(&st->i2c->dev,
"%s reg=%hhx lo=%hd hi=%hd ret=%d\n",
__func__, reg, thr_lo, thr_hi, ret);
}
return ret;
}
static int ltr_rd_light(struct ltr_state *st, s64 ts)
{
u32 hw;
u16 hw0;
u16 hw1;
unsigned int divisor;
int ratio;
int ch0_coeff = 1;
int ch1_coeff = 1;
int ret;
ret = ltr_i2c_read(st, LTR_REG_ALS_DATA_CH0_0, 2, (u8 *)&hw0);
if (ret)
return ret;
hw0 = be16_to_cpu(hw0);
ret = ltr_i2c_read(st, LTR_REG_ALS_DATA_CH1_0, 2, (u8 *)&hw1);
if (ret)
return ret;
hw1 = be16_to_cpu(hw1);
/* The code from here to the next comment is from a previous driver.
* It appears to do all the resolution calculations that the NVS light
* module would do. A 558 part wasn't available when this was written,
* so either this code is removed and use the nvs_light_dynamic table
* along with interpolation calibration or clear the
* nvs_light_dynamic.resolution to 1.0.
* Note that scale will divide the final result by 100 in user space.
*/
divisor = hw0 + hw1;
if (divisor) {
ratio = (hw1 * 100) / divisor;
if (ratio < 45) {
ch0_coeff = 17743;
ch1_coeff = -11059;
} else if ((ratio >= 45) && (ratio < 64)) {
ch0_coeff = 37725;
ch1_coeff = 13363;
} else if ((ratio >= 64) && (ratio < 85)) {
ch0_coeff = 16900;
ch1_coeff = 1690;
} else if (ratio >= 85) {
ch0_coeff = 0;
ch1_coeff = 0;
}
hw = ((hw0 * ch0_coeff) - (hw1 * ch1_coeff)) / 100;
} else {
hw = 0;
}
/* next comment */
if (st->sts & NVS_STS_SPEW_DATA)
dev_info(&st->i2c->dev,
"poll light hw %u %lld diff=%d %lldns index=%u\n",
hw, ts, hw - st->light.hw, ts - st->light.timestamp,
st->light.nld_i);
st->light.hw = hw;
st->light.timestamp = ts;
ret = nvs_light_read(&st->light);
if (ret < 1)
/* either poll or nothing to do */
return ret;
ret = ltr_thr_wr(st, LTR_REG_ALS_THRES_UP_0,
st->light.hw_thresh_lo, st->light.hw_thresh_hi);
return ret;
}
static int ltr_rd_prox(struct ltr_state *st, s64 ts)
{
u16 hw;
int ret;
ret = ltr_i2c_read(st, LTR_REG_PS_DATA_0, 2, (u8 *)&hw);
if (ret)
return ret;
hw = le16_to_cpu(hw);
hw &= LTR_REG_PS_DATA_MASK;
if (st->sts & NVS_STS_SPEW_DATA)
dev_info(&st->i2c->dev,
"poll proximity hw %hu %lld diff=%d %lldns\n",
hw, ts, hw - st->prox.hw, ts - st->prox.timestamp);
st->prox.hw = hw;
st->prox.timestamp = ts;
ret = nvs_proximity_read(&st->prox);
if (ret < 1)
/* either poll or nothing to do */
return ret;
ret = ltr_thr_wr(st, LTR_REG_PS_THRES_UP_0,
st->prox.hw_thresh_lo, st->prox.hw_thresh_hi);
return ret;
}
static int ltr_en(struct ltr_state *st, unsigned int enable)
{
if (enable & (1 << LTR_DEV_LIGHT))
nvs_light_enable(&st->light);
if (enable & (1 << LTR_DEV_PROX))
nvs_proximity_enable(&st->prox);
return ltr_cmd_wr(st, enable, false);
}
static int ltr_rd(struct ltr_state *st)
{
s64 ts;
u8 sts;
int ret = 0;
/* clear possible IRQ */
ret = ltr_i2c_rd(st, LTR_REG_STATUS, &sts);
if (ret)
return ret;
if (sts & LTR_REG_STATUS_DATA_MASK) {
ts = nvs_timestamp();
if (st->enabled & (1 << LTR_DEV_PROX))
ret |= ltr_rd_prox(st, ts);
if (st->enabled & (1 << LTR_DEV_LIGHT))
ret |= ltr_rd_light(st, ts);
} else {
ret = RET_POLL_NEXT;
}
if (ret < 0)
/* poll if error or more reporting */
ret = ltr_cmd_wr(st, st->enabled, false);
else
ret = ltr_cmd_wr(st, st->enabled, true);
return ret;
}
static unsigned int ltr_polldelay(struct ltr_state *st)
{
unsigned int poll_delay_ms = LTR_POLL_DLY_MS_DFLT;
if (st->enabled & (1 << LTR_DEV_LIGHT))
poll_delay_ms = st->light.poll_delay_ms;
if (st->enabled & (1 << LTR_DEV_PROX)) {
if (poll_delay_ms > st->prox.poll_delay_ms)
poll_delay_ms = st->prox.poll_delay_ms;
}
return poll_delay_ms;
}
static int ltr_read(struct ltr_state *st)
{
int ret;
ltr_mutex_lock(st);
ret = ltr_rd(st);
ltr_mutex_unlock(st);
return ret;
}
static void ltr_work(struct work_struct *ws)
{
struct ltr_state *st = container_of((struct work_struct *)ws,
struct ltr_state, ws);
int ret;
while (st->enabled) {
msleep(ltr_polldelay(st));
ret = ltr_read(st);
if (ret == RET_HW_UPDATE)
/* switch to IRQ driven */
break;
}
}
static irqreturn_t ltr_irq_thread(int irq, void *dev_id)
{
struct ltr_state *st = (struct ltr_state *)dev_id;
int ret;
if (st->sts & NVS_STS_SPEW_IRQ)
dev_info(&st->i2c->dev, "%s\n", __func__);
if (st->enabled) {
ret = ltr_read(st);
if (ret < RET_HW_UPDATE) {
/* switch to polling */
cancel_work_sync(&st->ws);
queue_work(st->wq, &st->ws);
}
}
return IRQ_HANDLED;
}
static int ltr_disable(struct ltr_state *st, int snsr_id)
{
bool disable = true;
int ret = 0;
if (snsr_id >= 0) {
if (st->enabled & ~(1 << snsr_id)) {
st->enabled &= ~(1 << snsr_id);
disable = false;
if (snsr_id == LTR_DEV_LIGHT)
ret = ltr_i2c_wr(st, LTR_REG_ALS_CONTR, 0);
else if (snsr_id == LTR_DEV_PROX)
ret = ltr_i2c_wr(st, LTR_REG_PS_CONTR, 0);
ret |= ltr_pm(st, st->enabled);
}
}
if (disable) {
ret |= ltr_pm(st, 0);
if (!ret)
st->enabled = 0;
}
return ret;
}
static int ltr_enable(void *client, int snsr_id, int enable)
{
struct ltr_state *st = (struct ltr_state *)client;
int ret;
if (enable < 0)
return st->enabled & (1 << snsr_id);
if (enable) {
enable = st->enabled | (1 << snsr_id);
ret = ltr_pm(st, enable);
if (!ret) {
ret = ltr_en(st, enable);
if (ret < 0) {
ltr_disable(st, snsr_id);
} else {
st->enabled = enable;
cancel_work_sync(&st->ws);
queue_work(st->wq, &st->ws);
}
}
} else {
ret = ltr_disable(st, snsr_id);
}
return ret;
}
static int ltr_batch(void *client, int snsr_id, int flags,
unsigned int period, unsigned int timeout)
{
struct ltr_state *st = (struct ltr_state *)client;
if (timeout)
/* timeout not supported (no HW FIFO) */
return -EINVAL;
if (snsr_id == LTR_DEV_LIGHT)
st->light.delay_us = period;
else if (snsr_id == LTR_DEV_PROX)
st->prox.delay_us = period;
return 0;
}
static int ltr_thresh_lo(void *client, int snsr_id, int thresh_lo)
{
struct ltr_state *st = (struct ltr_state *)client;
if (snsr_id == LTR_DEV_LIGHT)
nvs_light_threshold_calibrate_lo(&st->light, thresh_lo);
else if (snsr_id == LTR_DEV_PROX)
nvs_proximity_threshold_calibrate_lo(&st->prox, thresh_lo);
return 0;
}
static int ltr_thresh_hi(void *client, int snsr_id, int thresh_hi)
{
struct ltr_state *st = (struct ltr_state *)client;
if (snsr_id == LTR_DEV_LIGHT)
nvs_light_threshold_calibrate_hi(&st->light, thresh_hi);
else if (snsr_id == LTR_DEV_PROX)
nvs_proximity_threshold_calibrate_hi(&st->prox, thresh_hi);
return 0;
}
static int ltr_regs(void *client, int snsr_id, char *buf)
{
struct ltr_state *st = (struct ltr_state *)client;
ssize_t t;
u8 val[2];
u8 n;
u8 i;
int ret;
t = sprintf(buf, "registers:\n");
for (i = LTR_REG_ALS_CONTR; i <= LTR_REG_MANUFAC_ID; i++) {
ret = ltr_i2c_rd(st, i, val);
if (ret)
t += sprintf(buf + t, "0x%hhx=ERR\n", i);
else
t += sprintf(buf + t, "0x%hhx=0x%hhx\n",
i, val[0]);
}
if (st->dev_id == LTR_DEVID_558ALS) {
n = LTR_REG_ALS_DATA_CH0_1;
for (i = LTR_REG_ALS_DATA_CH1_0; i < n; i += 2) {
ret = ltr_i2c_read(st, i, 2, val);
if (ret)
t += sprintf(buf + t, "0x%hhx:0x%hhx=ERR\n",
i, i + 1);
else
t += sprintf(buf + t, "0x%hhx:0x%hhx=0x%hx\n",
i, i + 1,
le16_to_cpup((__le16 *)val));
}
}
ret = ltr_i2c_rd(st, LTR_REG_STATUS, val);
if (ret)
t += sprintf(buf + t, "0x%hhx=ERR\n", LTR_REG_STATUS);
else
t += sprintf(buf + t, "0x%hhx=0x%hhx\n",
LTR_REG_STATUS, val[0]);
ret = ltr_i2c_read(st, LTR_REG_PS_DATA_0, 2, val);
if (ret)
t += sprintf(buf + t, "0x%hhx:0x%hhx=ERR\n",
LTR_REG_PS_DATA_0, LTR_REG_PS_DATA_1);
else
t += sprintf(buf + t, "0x%hhx:0x%hhx=0x%hx\n",
LTR_REG_PS_DATA_0, LTR_REG_PS_DATA_1,
le16_to_cpup((__le16 *)val));
ret = ltr_i2c_rd(st, LTR_REG_INTERRUPT, val);
if (ret)
t += sprintf(buf + t, "0x%hhx=ERR\n",
LTR_REG_INTERRUPT);
else
t += sprintf(buf + t, "0x%hhx=0x%hhx\n",
LTR_REG_INTERRUPT, val[0]);
for (i = LTR_REG_PS_THRES_UP_0; i < LTR_REG_PS_THRES_LOW_1; i += 2) {
ret = ltr_i2c_read(st, i, 2, val);
if (ret)
t += sprintf(buf + t, "0x%hhx:0x%hhx=ERR\n", i, i + 1);
else
t += sprintf(buf + t, "0x%hhx:0x%hhx=0x%hx\n",
i, i + 1, le16_to_cpup((__le16 *)val));
}
ret = ltr_i2c_read(st, LTR_REG_PS_OFFSET_1, 2, val);
if (ret)
t += sprintf(buf + t, "0x%hhx:0x%hhx=ERR\n",
LTR_REG_PS_OFFSET_1, LTR_REG_PS_OFFSET_0);
else
t += sprintf(buf + t, "0x%hhx:0x%hhx=0x%hx\n",
i, i + 1, be16_to_cpup((__be16 *)val));
if (st->dev_id == LTR_DEVID_558ALS) {
n = LTR_REG_ALS_THRES_LOW_1;
for (i = LTR_REG_ALS_THRES_UP_0; i < n; i += 2) {
ret = ltr_i2c_read(st, i, 2, val);
if (ret)
t += sprintf(buf + t,
"0x%hhx:0x%hhx=ERR\n", i, i + 1);
else
t += sprintf(buf + t, "0x%hhx:0x%hhx=0x%hx\n",
i, i + 1,
le16_to_cpup((__le16 *)val));
}
}
ret = ltr_i2c_rd(st, LTR_REG_INTERRUPT_PERSIST, val);
if (ret)
t += sprintf(buf + t, "0x%hhx=ERR\n",
LTR_REG_INTERRUPT_PERSIST);
else
t += sprintf(buf + t, "0x%hhx=0x%hhx\n",
LTR_REG_INTERRUPT_PERSIST, val[0]);
return t;
}
static int ltr_nvs_read(void *client, int snsr_id, char *buf)
{
struct ltr_state *st = (struct ltr_state *)client;
ssize_t t;
t = sprintf(buf, "driver v.%u\n", LTR_DRIVER_VERSION);
t += sprintf(buf + t, "irq=%d\n", st->i2c->irq);
t += sprintf(buf + t, "irq_set_irq_wake=%x\n", st->irq_set_irq_wake);
t += sprintf(buf + t, "reg_ps_contr=%x\n", st->ps_contr);
t += sprintf(buf + t, "reg_ps_led=%x\n", st->ps_led);
t += sprintf(buf + t, "reg_ps_n_pulses=%x\n", st->ps_n_pulses);
t += sprintf(buf + t, "reg_ps_meas_rate=%x\n", st->ps_meas_rate);
t += sprintf(buf + t, "reg_als_meas_rate=%x\n", st->als_meas_rate);
t += sprintf(buf + t, "reg_interrupt=%x\n", st->interrupt);
t += sprintf(buf + t, "reg_interrupt_persist=%x\n",
st->interrupt_persist);
if (snsr_id == LTR_DEV_LIGHT)
t += nvs_light_dbg(&st->light, buf + t);
else if (snsr_id == LTR_DEV_PROX)
t += nvs_proximity_dbg(&st->prox, buf + t);
return t;
}
static struct nvs_fn_dev ltr_fn_dev = {
.enable = ltr_enable,
.batch = ltr_batch,
.thresh_lo = ltr_thresh_lo,
.thresh_hi = ltr_thresh_hi,
.regs = ltr_regs,
.nvs_read = ltr_nvs_read,
};
static int ltr_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct ltr_state *st = i2c_get_clientdata(client);
unsigned int i;
int ret = 0;
st->sts |= NVS_STS_SUSPEND;
if (st->nvs) {
for (i = 0; i < LTR_DEV_N; i++) {
if (st->nvs_st[i])
ret |= st->nvs->suspend(st->nvs_st[i]);
}
}
/* determine if we'll be operational during suspend */
for (i = 0; i < LTR_DEV_N; i++) {
if ((st->enabled & (1 << i)) && (st->cfg[i].flags &
SENSOR_FLAG_WAKE_UP))
break;
}
if (i < LTR_DEV_N) {
irq_set_irq_wake(st->i2c->irq, 1);
st->irq_set_irq_wake = true;
}
if (st->sts & NVS_STS_SPEW_MSG)
dev_info(&client->dev, "%s WAKE_ON=%x\n",
__func__, st->irq_set_irq_wake);
return ret;
}
static int ltr_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct ltr_state *st = i2c_get_clientdata(client);
unsigned int i;
int ret = 0;
if (st->irq_set_irq_wake) {
irq_set_irq_wake(st->i2c->irq, 0);
st->irq_set_irq_wake = false;
}
if (st->nvs) {
for (i = 0; i < LTR_DEV_N; i++) {
if (st->nvs_st[i])
ret |= st->nvs->resume(st->nvs_st[i]);
}
}
st->sts &= ~NVS_STS_SUSPEND;
if (st->sts & NVS_STS_SPEW_MSG)
dev_info(&client->dev, "%s\n", __func__);
return ret;
}
static SIMPLE_DEV_PM_OPS(ltr_pm_ops, ltr_suspend, ltr_resume);
static void ltr_shutdown(struct i2c_client *client)
{
struct ltr_state *st = i2c_get_clientdata(client);
unsigned int i;
st->sts |= NVS_STS_SHUTDOWN;
if (st->nvs) {
for (i = 0; i < LTR_DEV_N; i++) {
if (st->nvs_st[i])
st->nvs->shutdown(st->nvs_st[i]);
}
}
if (st->sts & NVS_STS_SPEW_MSG)
dev_info(&client->dev, "%s\n", __func__);
}
static int ltr_remove(struct i2c_client *client)
{
struct ltr_state *st = i2c_get_clientdata(client);
unsigned int i;
if (st != NULL) {
ltr_shutdown(client);
if (st->nvs) {
for (i = 0; i < LTR_DEV_N; i++) {
if (st->nvs_st[i])
st->nvs->remove(st->nvs_st[i]);
}
}
if (st->wq) {
destroy_workqueue(st->wq);
st->wq = NULL;
}
ltr_pm_exit(st);
}
dev_info(&client->dev, "%s\n", __func__);
return 0;
}
static void ltr_id_part(struct ltr_state *st, const char *part)
{
unsigned int i;
for (i = 0; i < LTR_DEV_N; i++)
st->cfg[i].part = part;
}
static int ltr_id_dev(struct ltr_state *st, const char *name)
{
u8 val;
unsigned int i;
int ret;
if (!strcmp(name, LTR_NAME_LTR659PS)) {
st->dev_id = LTR_DEVID_659PS;
ltr_id_part(st, LTR_NAME_LTR659PS);
} else if (!strcmp(name, LTR_NAME_LTR558ALS)) {
st->dev_id = LTR_DEVID_558ALS;
ltr_id_part(st, LTR_NAME_LTR558ALS);
} else {
ret = ltr_reset_sw(st);
ret |= ltr_i2c_rd(st, LTR_REG_MANUFAC_ID, &val);
if (ret)
return -ENODEV;
if (val != LTR_REG_MANUFAC_ID_VAL)
return -ENODEV;
ret = ltr_i2c_rd(st, LTR_REG_PART_ID, &val);
if (ret)
return -ENODEV;
val &= LTR_REG_PART_ID_MASK;
for (i = 0; i < ARRAY_SIZE(ltr_ids); i++) {
if (val == ltr_ids[i]) {
st->dev_id = val;
break;
}
}
if (i >= ARRAY_SIZE(ltr_ids)) {
dev_err(&st->i2c->dev, "%s ERR: ID %x != %s\n",
__func__, val, name);
return -ENODEV;
}
switch (st->dev_id) {
case LTR_DEVID_659PS:
ltr_id_part(st, LTR_NAME_LTR659PS);
break;
case LTR_DEVID_558ALS:
ltr_id_part(st, LTR_NAME_LTR558ALS);
break;
default:
return -ENODEV;
}
dev_info(&st->i2c->dev, "%s found %s for %s\n",
__func__, st->cfg[0].part, name);
}
return 0;
}
static int ltr_id_i2c(struct ltr_state *st, const char *name)
{
int i;
int ret;
for (i = 0; i < ARRAY_SIZE(ltr_i2c_addrs); i++) {
if (st->i2c->addr == ltr_i2c_addrs[i])
break;
}
if (i < ARRAY_SIZE(ltr_i2c_addrs)) {
st->i2c_addr = st->i2c->addr;
ret = ltr_id_dev(st, name);
} else {
name = LTR_NAME;
for (i = 0; i < ARRAY_SIZE(ltr_i2c_addrs); i++) {
st->i2c_addr = ltr_i2c_addrs[i];
ret = ltr_id_dev(st, name);
if (!ret)
break;
}
}
if (ret)
st->i2c_addr = 0;
return ret;
}
struct sensor_cfg ltr_cfg_dflt[] = {
{
.name = NVS_LIGHT_STRING,
.snsr_id = LTR_DEV_LIGHT,
.ch_n = 1,
.ch_sz = 4,
.part = LTR_NAME,
.vendor = LTR_VENDOR,
.version = LTR_LIGHT_VERSION,
.max_range = {
.ival = LTR_LIGHT_MAX_RANGE_IVAL,
.fval = LTR_LIGHT_MAX_RANGE_MICRO,
},
.resolution = {
.ival = LTR_LIGHT_RESOLUTION_IVAL,
.fval = LTR_LIGHT_RESOLUTION_MICRO,
},
.milliamp = {
.ival = LTR_LIGHT_MILLIAMP_IVAL,
.fval = LTR_LIGHT_MILLIAMP_MICRO,
},
.delay_us_min = LTR_POLL_DLY_MS_MIN * 1000,
.delay_us_max = LTR_POLL_DLY_MS_MAX * 1000,
.flags = SENSOR_FLAG_ON_CHANGE_MODE,
.scale = {
.ival = LTR_LIGHT_SCALE_IVAL,
.fval = LTR_LIGHT_SCALE_MICRO,
},
.thresh_lo = LTR_LIGHT_THRESHOLD_DFLT,
.thresh_hi = LTR_LIGHT_THRESHOLD_DFLT,
},
{
.name = NVS_PROXIMITY_STRING,
.snsr_id = LTR_DEV_PROX,
.ch_n = 1,
.ch_sz = 4,
.part = LTR_NAME,
.vendor = LTR_VENDOR,
.version = LTR_PROX_VERSION,
.max_range = {
.ival = LTR_PROX_MAX_RANGE_IVAL,
.fval = LTR_PROX_MAX_RANGE_MICRO,
},
.resolution = {
.ival = LTR_PROX_RESOLUTION_IVAL,
.fval = LTR_PROX_RESOLUTION_MICRO,
},
.milliamp = {
.ival = LTR_PROX_MILLIAMP_IVAL,
.fval = LTR_PROX_MILLIAMP_MICRO,
},
.delay_us_min = LTR_POLL_DLY_MS_MIN * 1000,
.delay_us_max = LTR_POLL_DLY_MS_MAX * 1000,
.flags = SENSOR_FLAG_ON_CHANGE_MODE |
SENSOR_FLAG_WAKE_UP,
.scale = {
.ival = LTR_PROX_SCALE_IVAL,
.fval = LTR_PROX_SCALE_MICRO,
},
.thresh_lo = LTR_PROX_THRESHOLD_LO,
.thresh_hi = LTR_PROX_THRESHOLD_HI,
}
};
static int ltr_of_dt(struct ltr_state *st, struct device_node *dn)
{
unsigned int i;
int ret;
for (i = 0; i < LTR_DEV_N; i++)
memcpy(&st->cfg[i], &ltr_cfg_dflt[i], sizeof(st->cfg[0]));
st->light.cfg = &st->cfg[LTR_DEV_LIGHT];
st->light.hw_mask = 0xFFFF;
st->light.nld_tbl = ltr_nld_tbl;
st->prox.cfg = &st->cfg[LTR_DEV_PROX];
st->prox.hw_mask = 0xFFFF;
/* default device specific parameters */
st->ps_contr = LTR_REG_PS_CONTR_DFLT;
st->ps_led = LTR_REG_PS_LED_DFLT;
st->ps_n_pulses = LTR_REG_PS_N_PULSES_DFLT;
st->ps_meas_rate = LTR_REG_PS_MEAS_RATE_DFLT;
st->als_meas_rate = LTR_REG_ALS_MEAS_RATE_DFLT;
st->interrupt_persist = LTR_REG_INTERRUPT_PERSIST_DFLT;
/* device tree parameters */
if (dn) {
/* common NVS parameters */
for (i = 0; i < LTR_DEV_N; i++) {
ret = nvs_of_dt(dn, &st->cfg[i], NULL);
if (ret == -ENODEV)
/* the entire device has been disabled */
return -ENODEV;
}
/* device specific parameters */
of_property_read_u8(dn, "reg_ps_contr", &st->ps_contr);
st->ps_contr &= LTR_REG_PS_CONTR_POR_MASK;
of_property_read_u8(dn, "reg_ps_led", &st->ps_led);
of_property_read_u8(dn, "register_ps_n_pulses",
&st->ps_n_pulses);
of_property_read_u8(dn, "reg_ps_meas_rate",
&st->ps_meas_rate);
of_property_read_u8(dn, "reg_als_meas_rate",
&st->als_meas_rate);
of_property_read_u8(dn, "reg_interrupt", &st->interrupt);
/* just interrupt polarity */
st->interrupt &= LTR_REG_INTERRUPT_POLARITY;
of_property_read_u8(dn, "reg_interrupt_persist",
&st->interrupt_persist);
}
/* this device supports these programmable parameters */
if (nvs_light_of_dt(&st->light, dn, NULL)) {
st->light.nld_i_lo = 0;
st->light.nld_i_hi = ARRAY_SIZE(ltr_nld_tbl) - 1;
}
return 0;
}
static int ltr_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct ltr_state *st;
unsigned long irqflags;
unsigned int n;
unsigned int i;
int ret;
dev_info(&client->dev, "%s\n", __func__);
st = devm_kzalloc(&client->dev, sizeof(*st), GFP_KERNEL);
if (st == NULL) {
dev_err(&client->dev, "%s devm_kzalloc ERR\n", __func__);
return -ENOMEM;
}
i2c_set_clientdata(client, st);
st->i2c = client;
ret = ltr_of_dt(st, client->dev.of_node);
if (ret) {
if (ret == -ENODEV) {
dev_info(&client->dev, "%s DT disabled\n", __func__);
} else {
dev_err(&client->dev, "%s _of_dt ERR\n", __func__);
ret = -ENODEV;
}
goto ltr_probe_exit;
}
ltr_pm_init(st);
ret = ltr_id_i2c(st, id->name);
if (ret) {
dev_err(&client->dev, "%s _id_i2c ERR\n", __func__);
ret = -ENODEV;
goto ltr_probe_exit;
}
ltr_pm(st, 0);
ltr_fn_dev.sts = &st->sts;
ltr_fn_dev.errs = &st->errs;
st->nvs = nvs_iio();
if (st->nvs == NULL) {
ret = -ENODEV;
goto ltr_probe_exit;
}
st->light.handler = st->nvs->handler;
st->prox.handler = st->nvs->handler;
if (client->irq < 1) {
/* disable WAKE_ON ability when no interrupt */
for (i = 0; i < LTR_DEV_N; i++)
st->cfg[i].flags &= ~SENSOR_FLAG_WAKE_UP;
}
n = 0;
for (i = 0; i < LTR_DEV_N; i++) {
ret = st->nvs->probe(&st->nvs_st[i], st, &client->dev,
&ltr_fn_dev, &st->cfg[i]);
if (!ret)
n++;
}
if (!n) {
dev_err(&client->dev, "%s nvs_probe ERR\n", __func__);
ret = -ENODEV;
goto ltr_probe_exit;
}
st->light.nvs_st = st->nvs_st[LTR_DEV_LIGHT];
st->prox.nvs_st = st->nvs_st[LTR_DEV_PROX];
st->wq = create_workqueue(LTR_NAME);
if (!st->wq) {
dev_err(&client->dev, "%s create_workqueue ERR\n", __func__);
ret = -ENOMEM;
goto ltr_probe_exit;
}
INIT_WORK(&st->ws, ltr_work);
if (client->irq) {
irqflags = IRQF_ONESHOT;
if (st->interrupt & LTR_REG_INTERRUPT_POLARITY)
irqflags |= IRQF_TRIGGER_RISING;
else
irqflags |= IRQF_TRIGGER_FALLING;
for (i = 0; i < LTR_DEV_N; i++) {
if (st->cfg[i].snsr_id >= 0) {
if (st->cfg[i].flags & SENSOR_FLAG_WAKE_UP)
irqflags |= IRQF_NO_SUSPEND;
}
}
ret = request_threaded_irq(client->irq, NULL, ltr_irq_thread,
irqflags, LTR_NAME, st);
if (ret) {
dev_err(&client->dev, "%s req_threaded_irq ERR %d\n",
__func__, ret);
ret = -ENOMEM;
goto ltr_probe_exit;
}
}
dev_info(&client->dev, "%s done\n", __func__);
return 0;
ltr_probe_exit:
ltr_remove(client);
return ret;
}
static const struct i2c_device_id ltr_i2c_device_id[] = {
{ LTR_NAME, 0 },
{ LTR_NAME_LTR659PS, 0 },
{ LTR_NAME_LTR558ALS, 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, ltr_i2c_device_id);
static const struct of_device_id ltr_of_match[] = {
{ .compatible = "liteon,ltrX5X", },
{ .compatible = "liteon,ltr659ps", },
{ .compatible = "liteon,ltr558als", },
{},
};
MODULE_DEVICE_TABLE(of, ltr_of_match);
static struct i2c_driver ltr_driver = {
.class = I2C_CLASS_HWMON,
.probe = ltr_probe,
.remove = ltr_remove,
.shutdown = ltr_shutdown,
.driver = {
.name = LTR_NAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(ltr_of_match),
.pm = &ltr_pm_ops,
},
.id_table = ltr_i2c_device_id,
};
module_i2c_driver(ltr_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LTR659PS driver");
MODULE_AUTHOR("NVIDIA Corporation");
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