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tegrakernel/kernel/nvidia/drivers/iio/light/nvs_max4400x.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 MX_DRIVER_VERSION (3)
#define MX_VENDOR "Maxim"
#define MX_NAME "max4400x"
#define MX_NAME_MAX44005 "max44005"
#define MX_NAME_MAX44006 "max44006"
#define MX_NAME_MAX44008 "max44008"
#define MX_DEVID_MAX44005 (0x05)
#define MX_DEVID_MAX44006 (0x06)
#define MX_DEVID_MAX44008 (0x08)
#define MX_HW_DELAY_MS (1)
#define MX_POLL_DLY_MS_DFLT (2000)
#define MX_POLL_DLY_MS_MIN (100)
#define MX_POLL_DLY_MS_MAX (60000)
#define MX_AMB_CFG_DFLT (0x40)
#define MX_PRX_CFG_DFLT (0x12)
/* light defines */
#define MX_LIGHT_VERSION (1)
#define MX_LIGHT_MAX_RANGE_IVAL (14323)
#define MX_LIGHT_MAX_RANGE_MICRO (0)
#define MX_LIGHT_RESOLUTION_IVAL (0)
#define MX_LIGHT_RESOLUTION_MICRO (14000)
#define MX_LIGHT_MILLIAMP_IVAL (0)
#define MX_LIGHT_MILLIAMP_MICRO (13500)
#define MX_LIGHT_SCALE_IVAL (0)
#define MX_LIGHT_SCALE_MICRO (1000)
#define MX_LIGHT_THRESHOLD_DFLT (50)
/* proximity defines */
#define MX_PROX_VERSION (1)
/* binary proximity when max_range and resolution are 1.0 */
#define MX_PROX_MAX_RANGE_IVAL (1)
#define MX_PROX_MAX_RANGE_MICRO (0)
#define MX_PROX_RESOLUTION_IVAL (1)
#define MX_PROX_RESOLUTION_MICRO (0)
#define MX_PROX_MILLIAMP_IVAL (10)
#define MX_PROX_MILLIAMP_MICRO (19500)
#define MX_PROX_SCALE_IVAL (0)
#define MX_PROX_SCALE_MICRO (0)
#define MX_PROX_THRESHOLD_LO_DFLT (10)
#define MX_PROX_THRESHOLD_HI_DFLT (100)
/* HW registers */
#define MX_REG_STS (0x00)
#define MX_REG_STS_POR (0x04)
#define MX_REG_STS_RESET (4)
#define MX_REG_STS_SHDN (3)
#define MX_REG_STS_PWRON (2)
#define MX_REG_STS_PRXINTS (1)
#define MX_REG_STS_AMBINTS (0)
#define MX_REG_CFG_MAIN (0x01)
#define MX_REG_CFG_MAIN_POR (0x00)
#define MX_REG_CFG_MAIN_MODE (4)
#define MX_REG_CFG_MAIN_AMBSEL (2)
#define MX_REG_CFG_MAIN_PRXINTE (1)
#define MX_REG_CFG_MAIN_AMBINTE (0)
#define MX_REG_CFG_MAIN_INTE_MASK (0x03)
#define MX_REG_CFG_AMB (0x02)
#define MX_REG_CFG_AMB_POR (0x20)
#define MX_REG_CFG_AMB_TRIM (7)
#define MX_REG_CFG_AMB_COMPEN (6)
#define MX_REG_CFG_AMB_TEMPEN (5)
#define MX_REG_CFG_AMB_AMBTIM (2)
#define MX_REG_CFG_AMB_AMBTIM_MASK (0x1C)
#define MX_REG_CFG_AMB_AMBPGA (0)
#define MX_REG_CFG_AMB_AMBPGA_MASK (0x03)
#define MX_REG_CFG_PRX (0x03)
#define MX_REG_CFG_PRX_DRV (4)
#define MX_REG_CFG_PRX_PRXTIM (1)
#define MX_REG_CFG_PRX_PRXPGA (0)
#define MX_REG_DATA_AMB_CLEAR (0x04)
#define MX_REG_DATA_AMB_CLEAR_H (0x04)
#define MX_REG_DATA_AMB_CLEAR_L (0x05)
#define MX_REG_DATA_AMB_RED_H (0x06)
#define MX_REG_DATA_AMB_RED_L (0x07)
#define MX_REG_DATA_AMB_GREEN_H (0x08)
#define MX_REG_DATA_AMB_GREEN_L (0x09)
#define MX_REG_DATA_AMB_BLUE_H (0x0A)
#define MX_REG_DATA_AMB_BLUE_L (0x0B)
#define MX_REG_DATA_AMB_IR_H (0x0C)
#define MX_REG_DATA_AMB_IR_L (0x0D)
#define MX_REG_DATA_AMB_IRCOMP_H (0x0E)
#define MX_REG_DATA_AMB_IRCOMP_L (0x0F)
#define MX_REG_DATA_PROX_H (0x10)
#define MX_REG_DATA_PROX_L (0x11)
#define MX_REG_DATA_TEMP_H (0x12)
#define MX_REG_DATA_TEMP_L (0x13)
#define MX_REG_AMB_UPTHR_H (0x14)
#define MX_REG_AMB_UPTHR_L (0x15)
#define MX_REG_AMB_LOTHR_H (0x16)
#define MX_REG_AMB_LOTHR_L (0x17)
#define MX_REG_CFG_THR (0x18)
#define MX_REG_CFG_THR_PRXPST (2)
#define MX_REG_CFG_THR_AMBPST (0)
#define MX_REG_PRX_UPTHR_H (0x19)
#define MX_REG_PRX_UPTHR_L (0x1A)
#define MX_REG_PRX_LOTHR_H (0x1B)
#define MX_REG_PRX_LOTHR_L (0x1C)
#define MX_REG_TRIM_CLEAR (0x1D)
#define MX_REG_TRIM_RED (0x1E)
#define MX_REG_TRIM_GREEN (0x1F)
#define MX_REG_TRIM_BLUE (0x20)
#define MX_REG_TRIM_IR (0x21)
#define MX_DEV_LIGHT (0)
#define MX_DEV_PROX (1)
#define MX_DEV_N (2)
/* regulator names in order of powering on */
static char *mx_vregs[] = {
"vdd",
"vled"
};
#define MX_PM_ON (1)
#define MX_PM_LED (ARRAY_SIZE(mx_vregs))
static unsigned short mx_i2c_addrs[] = {
0x40,
0x41,
0x44,
0x45,
};
/* enable bit mask of MX_DEV_ (MX_DEV_TEMP would be bit 2) */
static u8 mx_mode_tbl[] = { /* device enable */
0x00, /* nothing */
0x00, /* light */
0x50, /* proximity */
0x30, /* proximity + light */
0x00, /* temp */
0x00, /* temp + light */
0x30, /* temp + proximity */
0x30 /* temp + proximity + light */
};
/* 1 nW/cm^2 = 0.00683 lux */
static struct nvs_light_dynamic mx_nld_tbl_44005[] = {
{{0, 20490}, {335, 687670}, {0, 13500}, 100, 0x00},
{{0, 81960}, {1342, 750680}, {0, 13500}, 100, 0x01},
{{0, 327680}, {5368, 381440}, {0, 13500}, 100, 0x02},
{{5, 245440}, {85936, 43520}, {0, 13500}, 100, 0x03}
};
static struct nvs_light_dynamic mx_nld_tbl_44006[] = {
{{0, 13660}, {223, 791780}, {0, 13500}, 100, 0x00},
{{0, 54640}, {895, 167120}, {0, 13500}, 100, 0x01},
{{0, 218560}, {3580, 668480}, {0, 13500}, 100, 0x02},
{{3, 496960}, {57290, 695680}, {0, 13500}, 100, 0x03}
};
static unsigned int mx_ambtim_mask[] = {
0x3FFF, /* 14 bits */
0x0FFF, /* 12 bits */
0x03FF, /* 10 bits */
0x00FF, /* 8 bits */
0x3FFF, /* 14 bits */
0x3FFF, /* N/A */
0x3FFF, /* N/A */
0x3FFF, /* N/A */
};
struct mx_state {
struct i2c_client *i2c;
struct nvs_fn_if *nvs;
void *nvs_st[MX_DEV_N];
struct sensor_cfg cfg[MX_DEV_N];
struct workqueue_struct *wq;
struct work_struct ws;
struct regulator_bulk_data vreg[ARRAY_SIZE(mx_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 amb_cfg; /* ambient configuration register */
u8 prx_cfg; /* proximity configuration register */
u8 thr_cfg; /* threshold persist register */
u8 rc_main_cfg; /* cache of main configuration */
u8 rc_amb_cfg; /* cache of ambient configuration */
};
static void mx_err(struct mx_state *st)
{
st->errs++;
if (!st->errs)
st->errs--;
}
static void mx_mutex_lock(struct mx_state *st)
{
unsigned int i;
if (st->nvs) {
for (i = 0; i < MX_DEV_N; i++) {
if (st->nvs_st[i])
st->nvs->nvs_mutex_lock(st->nvs_st[i]);
}
}
}
static void mx_mutex_unlock(struct mx_state *st)
{
unsigned int i;
if (st->nvs) {
for (i = 0; i < MX_DEV_N; i++) {
if (st->nvs_st[i])
st->nvs->nvs_mutex_unlock(st->nvs_st[i]);
}
}
}
static int mx_i2c_read(struct mx_state *st, u8 reg, u16 len, u8 *val)
{
struct i2c_msg msg[2];
int ret = -ENODEV;
if (st->i2c_addr) {
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) {
ret = 0;
} else {
mx_err(st);
ret = -EIO;
}
}
return ret;
}
static int mx_i2c_rd(struct mx_state *st, u8 reg, u8 *val)
{
return mx_i2c_read(st, reg, 1, val);
}
static int mx_i2c_write(struct mx_state *st, u16 len, u8 *buf)
{
struct i2c_msg msg;
int ret = -ENODEV;
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) {
ret = 0;
} else {
mx_err(st);
ret = -EIO;
}
}
return ret;
}
static int mx_i2c_wr(struct mx_state *st, u8 reg, u8 val)
{
u8 buf[2];
buf[0] = reg;
buf[1] = val;
return mx_i2c_write(st, sizeof(buf), buf);
}
static void mx_cfg(struct mx_state *st)
{
unsigned int i;
i = st->rc_amb_cfg & MX_REG_CFG_AMB_AMBTIM_MASK;
i >>= MX_REG_CFG_AMB_AMBTIM;
st->light.hw_mask = mx_ambtim_mask[i];
}
static int mx_reset_sw(struct mx_state *st)
{
int ret;
ret = mx_i2c_wr(st, MX_REG_STS, (1 << MX_REG_STS_RESET));
if (!ret) {
mdelay(MX_HW_DELAY_MS);
st->rc_main_cfg = MX_REG_CFG_MAIN_POR;
st->rc_amb_cfg = MX_REG_CFG_AMB_POR;
mx_cfg(st);
}
return ret;
}
static int mx_pm(struct mx_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 < MX_DEV_PROX))
vreg_n = MX_PM_LED;
else
vreg_n = MX_PM_ON;
nvs_vregs_enable(&st->i2c->dev, st->vreg, vreg_n);
if (ret)
mdelay(MX_HW_DELAY_MS);
ret = mx_reset_sw(st);
vreg_n_dis = ARRAY_SIZE(mx_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, MX_PM_ON);
if ((ret < 0) || (ret == MX_PM_ON)) {
ret = mx_i2c_wr(st, MX_REG_CFG_PRX, 0);
ret |= mx_i2c_wr(st, MX_REG_STS, 1 << MX_REG_STS_SHDN);
} else if (ret > 0) {
nvs_vregs_enable(&st->i2c->dev, st->vreg, MX_PM_ON);
mdelay(MX_HW_DELAY_MS);
ret = mx_i2c_wr(st, MX_REG_CFG_PRX, 0);
ret |= mx_i2c_wr(st, MX_REG_STS, 1 << MX_REG_STS_SHDN);
}
ret |= nvs_vregs_disable(&st->i2c->dev, st->vreg,
ARRAY_SIZE(mx_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 mx_pm_exit(struct mx_state *st)
{
mx_pm(st, 0);
nvs_vregs_exit(&st->i2c->dev, st->vreg, ARRAY_SIZE(mx_vregs));
}
static int mx_pm_init(struct mx_state *st)
{
int ret;
st->enabled = 0;
nvs_vregs_init(&st->i2c->dev,
st->vreg, ARRAY_SIZE(mx_vregs), mx_vregs);
ret = mx_pm(st, (1 << MX_DEV_N));
return ret;
}
static int mx_cmd_wr(struct mx_state *st, unsigned int enable, bool irq_en)
{
u8 amb_cfg = st->amb_cfg;
u8 main_cfg = 0;
int ret;
int ret_t = 0;
amb_cfg |= mx_nld_tbl_44005[st->light.nld_i].driver_data;
if (amb_cfg != st->rc_amb_cfg) {
ret = mx_i2c_wr(st, MX_REG_CFG_AMB, amb_cfg);
if (ret) {
ret_t |= ret;
} else {
st->rc_amb_cfg = amb_cfg;
mx_cfg(st);
}
if (st->sts & NVS_STS_SPEW_MSG)
dev_info(&st->i2c->dev, "%s amb_cfg=%hhx err=%d\n",
__func__, amb_cfg, ret);
}
main_cfg = mx_mode_tbl[enable];
if (irq_en && (st->i2c->irq > 0)) {
if (enable & (1 << MX_DEV_LIGHT))
main_cfg |= (1 << MX_REG_CFG_MAIN_AMBINTE);
if (enable & (1 << MX_DEV_PROX))
main_cfg |= (1 << MX_REG_CFG_MAIN_PRXINTE);
}
if (main_cfg != st->rc_main_cfg) {
ret = mx_i2c_wr(st, MX_REG_CFG_MAIN, main_cfg);
if (ret)
ret_t |= ret;
else
st->rc_main_cfg = main_cfg;
if (st->sts & NVS_STS_SPEW_MSG)
dev_info(&st->i2c->dev, "%s main_cfg=%hhx err=%d\n",
__func__, main_cfg, ret);
}
if (st->rc_main_cfg & MX_REG_CFG_MAIN_INTE_MASK)
ret_t = RET_HW_UPDATE; /* flag IRQ enabled */
return ret_t;
}
static int mx_thr_wr(struct mx_state *st, u8 reg, u16 thr_lo, u16 thr_hi)
{
u8 buf[5];
u16 thr_be;
int ret = RET_POLL_NEXT;
if (st->i2c->irq > 0) {
buf[0] = reg;
thr_be = cpu_to_be16(thr_hi);
buf[1] = thr_be & 0xFF;
buf[2] = thr_be >> 8;
thr_be = cpu_to_be16(thr_lo);
buf[3] = thr_be & 0xFF;
buf[4] = thr_be >> 8;
ret = mx_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 mx_rd_light(struct mx_state *st, s64 ts)
{
u16 hw;
int ret;
ret = mx_i2c_read(st, MX_REG_DATA_AMB_CLEAR, 2, (u8 *)&hw);
if (ret)
return ret;
hw = be16_to_cpu(hw);
if (st->sts & NVS_STS_SPEW_DATA)
dev_info(&st->i2c->dev,
"poll light hw %hu %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 < RET_HW_UPDATE)
/* either poll or nothing to do */
return ret;
ret = mx_thr_wr(st, MX_REG_AMB_UPTHR_H,
st->light.hw_thresh_lo, st->light.hw_thresh_hi);
return ret;
}
static int mx_rd_prox(struct mx_state *st, s64 ts)
{
u16 hw;
int ret;
ret = mx_i2c_read(st, MX_REG_DATA_PROX_H, 2, (u8 *)&hw);
if (ret)
return ret;
hw = be16_to_cpu(hw);
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 < RET_HW_UPDATE)
/* either poll or nothing to do */
return ret;
ret = mx_thr_wr(st, MX_REG_PRX_UPTHR_H,
st->prox.hw_thresh_lo, st->prox.hw_thresh_hi);
return ret;
}
static int mx_en(struct mx_state *st, unsigned int enable)
{
int ret;
ret = mx_i2c_wr(st, MX_REG_CFG_THR, st->thr_cfg);
if (enable & (1 << MX_DEV_PROX)) {
ret |= mx_i2c_wr(st, MX_REG_CFG_PRX, st->prx_cfg);
if (st->prx_cfg & (1 << MX_REG_CFG_PRX_PRXTIM))
st->prox.hw_mask = 0x00FF;
else
st->prox.hw_mask = 0x03FF;
nvs_proximity_enable(&st->prox);
}
if (enable & (1 << MX_DEV_LIGHT))
nvs_light_enable(&st->light);
ret |= mx_cmd_wr(st, enable, false);
if (st->sts & NVS_STS_SPEW_MSG) {
if (enable & (1 << MX_DEV_PROX))
dev_info(&st->i2c->dev,
"%s thr_cfg=%hhx prx_cfg=%hhx err=%d\n",
__func__, st->thr_cfg, st->prx_cfg, ret);
else
dev_info(&st->i2c->dev, "%s thr_cfg=%hhx err=%d\n",
__func__, st->thr_cfg, ret);
}
return ret;
}
static int mx_rd(struct mx_state *st)
{
u8 sts;
s64 ts;
int ret;
/* clear possible IRQ */
ret = mx_i2c_rd(st, MX_REG_STS, &sts);
if (ret)
return ret;
if (sts & (1 << MX_REG_STS_PWRON)) {
/* restart */
mx_en(st, st->enabled);
return RET_POLL_NEXT;
}
ts = nvs_timestamp();
if (st->enabled & (1 << MX_DEV_PROX))
ret |= mx_rd_prox(st, ts);
if (st->enabled & (1 << MX_DEV_LIGHT))
ret |= mx_rd_light(st, ts);
if (ret < 0)
/* poll if error or more reporting */
ret = mx_cmd_wr(st, st->enabled, false);
else
ret = mx_cmd_wr(st, st->enabled, true);
return ret;
}
static unsigned int mx_polldelay(struct mx_state *st)
{
unsigned int poll_delay_ms = MX_POLL_DLY_MS_DFLT;
if (st->enabled & (1 << MX_DEV_LIGHT))
poll_delay_ms = st->light.poll_delay_ms;
if (st->enabled & (1 << MX_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 mx_read(struct mx_state *st)
{
int ret;
mx_mutex_lock(st);
ret = mx_rd(st);
mx_mutex_unlock(st);
return ret;
}
static void mx_work(struct work_struct *ws)
{
struct mx_state *st = container_of((struct work_struct *)ws,
struct mx_state, ws);
int ret;
while (st->enabled) {
msleep(mx_polldelay(st));
ret = mx_read(st);
if (ret == RET_HW_UPDATE)
/* switch to IRQ driven */
break;
}
}
static irqreturn_t mx_irq_thread(int irq, void *dev_id)
{
struct mx_state *st = (struct mx_state *)dev_id;
int ret;
if (st->sts & NVS_STS_SPEW_IRQ)
dev_info(&st->i2c->dev, "%s\n", __func__);
if (st->enabled) {
ret = mx_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 mx_disable(struct mx_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 == MX_DEV_PROX)
ret = mx_i2c_wr(st, MX_REG_CFG_PRX, 0);
ret |= mx_pm(st, st->enabled);
}
}
if (disable) {
ret = mx_pm(st, 0);
if (!ret)
st->enabled = 0;
}
return ret;
}
static int mx_enable(void *client, int snsr_id, int enable)
{
struct mx_state *st = (struct mx_state *)client;
int ret;
if (enable < 0)
return st->enabled & (1 << snsr_id);
if (enable) {
enable = st->enabled | (1 << snsr_id);
ret = mx_pm(st, enable);
if (!ret) {
ret = mx_en(st, enable);
if (ret < 0) {
mx_disable(st, snsr_id);
} else {
st->enabled = enable;
cancel_work_sync(&st->ws);
queue_work(st->wq, &st->ws);
}
}
} else {
ret = mx_disable(st, snsr_id);
}
return ret;
}
static int mx_batch(void *client, int snsr_id, int flags,
unsigned int period, unsigned int timeout)
{
struct mx_state *st = (struct mx_state *)client;
if (timeout)
/* timeout not supported (no HW FIFO) */
return -EINVAL;
if (snsr_id == MX_DEV_LIGHT)
st->light.delay_us = period;
else if (snsr_id == MX_DEV_PROX)
st->prox.delay_us = period;
return 0;
}
static int mx_thresh_lo(void *client, int snsr_id, int thresh_lo)
{
struct mx_state *st = (struct mx_state *)client;
if (snsr_id == MX_DEV_LIGHT)
nvs_light_threshold_calibrate_lo(&st->light, thresh_lo);
else if (snsr_id == MX_DEV_PROX)
nvs_proximity_threshold_calibrate_lo(&st->prox, thresh_lo);
return 0;
}
static int mx_thresh_hi(void *client, int snsr_id, int thresh_hi)
{
struct mx_state *st = (struct mx_state *)client;
if (snsr_id == MX_DEV_LIGHT)
nvs_light_threshold_calibrate_hi(&st->light, thresh_hi);
else if (snsr_id == MX_DEV_PROX)
nvs_proximity_threshold_calibrate_hi(&st->prox, thresh_hi);
return 0;
}
static int mx_regs(void *client, int snsr_id, char *buf)
{
struct mx_state *st = (struct mx_state *)client;
ssize_t t;
u8 val[2];
u8 i;
int ret;
t = sprintf(buf, "registers:\n");
for (i = 0; i <= MX_REG_CFG_PRX; i++) {
ret = mx_i2c_rd(st, i, val);
if (!ret)
t += sprintf(buf + t, "0x%hhx=0x%hhx\n",
i, val[0]);
}
for (i = MX_REG_DATA_AMB_CLEAR; i < MX_REG_CFG_THR; i += 2) {
ret = mx_i2c_read(st, i, 2, val);
if (!ret)
t += sprintf(buf + t, "0x%hhx:0x%hhx=0x%hx\n",
i, i + 1, be16_to_cpup((__be16 *)val));
}
ret = mx_i2c_rd(st, MX_REG_CFG_THR, val);
if (!ret)
t += sprintf(buf + t, "0x%hhx=0x%hhx\n",
MX_REG_CFG_THR, val[0]);
for (i = MX_REG_PRX_UPTHR_H; i < MX_REG_TRIM_CLEAR; i += 2) {
ret = mx_i2c_read(st, i, 2, val);
if (!ret)
t += sprintf(buf + t, "0x%hhx:0x%hhx=0x%hx\n",
i, i + 1, be16_to_cpup((__be16 *)val));
}
for (i = MX_REG_TRIM_CLEAR; i <= MX_REG_TRIM_IR; i++) {
ret = mx_i2c_rd(st, i, val);
if (!ret)
t += sprintf(buf + t, "0x%hhx=0x%hhx\n",
i, val[0]);
}
return t;
}
static int mx_nvs_read(void *client, int snsr_id, char *buf)
{
struct mx_state *st = (struct mx_state *)client;
ssize_t t;
t = sprintf(buf, "driver v.%u\n", MX_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_ambient_cfg=%x\n", st->amb_cfg);
t += sprintf(buf + t, "reg_proximity_cfg=%x\n", st->prx_cfg);
t += sprintf(buf + t, "reg_threshold_persist=%x\n", st->thr_cfg);
if (snsr_id == MX_DEV_LIGHT)
t += nvs_light_dbg(&st->light, buf + t);
else if (snsr_id == MX_DEV_PROX)
t += nvs_proximity_dbg(&st->prox, buf + t);
return t;
}
static struct nvs_fn_dev mx_fn_dev = {
.enable = mx_enable,
.batch = mx_batch,
.thresh_lo = mx_thresh_lo,
.thresh_hi = mx_thresh_hi,
.regs = mx_regs,
.nvs_read = mx_nvs_read,
};
static int mx_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mx_state *st = i2c_get_clientdata(client);
unsigned int i;
int ret = 0;
st->sts |= NVS_STS_SUSPEND;
if (st->nvs) {
for (i = 0; i < MX_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 < MX_DEV_N; i++) {
if ((st->enabled & (1 << i)) && (st->cfg[i].flags &
SENSOR_FLAG_WAKE_UP))
break;
}
if (i < MX_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 mx_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mx_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 < MX_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 0;
}
static SIMPLE_DEV_PM_OPS(mx_pm_ops, mx_suspend, mx_resume);
static void mx_shutdown(struct i2c_client *client)
{
struct mx_state *st = i2c_get_clientdata(client);
unsigned int i;
st->sts |= NVS_STS_SHUTDOWN;
if (st->nvs) {
for (i = 0; i < MX_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 mx_remove(struct i2c_client *client)
{
struct mx_state *st = i2c_get_clientdata(client);
unsigned int i;
if (st != NULL) {
mx_shutdown(client);
if (st->nvs) {
for (i = 0; i < MX_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;
}
mx_pm_exit(st);
}
dev_info(&client->dev, "%s\n", __func__);
return 0;
}
static void mx_id_part(struct mx_state *st, const char *part)
{
unsigned int i;
for (i = 0; i < MX_DEV_N; i++)
st->cfg[i].part = part;
}
static int mx_id_dev(struct mx_state *st, const char *name)
{
struct nvs_light_dynamic *mx_nld_tbl;
u8 val;
unsigned int i;
int ret = 0;
if (!strcmp(name, MX_NAME_MAX44008)) {
st->dev_id = MX_DEVID_MAX44008;
mx_id_part(st, MX_NAME_MAX44008);
} else if (!strcmp(name, MX_NAME_MAX44006)) {
st->dev_id = MX_DEVID_MAX44006;
mx_id_part(st, MX_NAME_MAX44006);
} else if (!strcmp(name, MX_NAME_MAX44005)) {
st->dev_id = MX_DEVID_MAX44005;
mx_id_part(st, MX_NAME_MAX44005);
} else {
/* There is no way to auto-detect the device since the
* MX44006/8 has actual proximity HW that works but just
* doesn't have the undetectable LED driver HW. And of
* course there isn't an ID register either. So we'll
* just confirm that our device exists and default to the
* MX44005 with proximity support if using max4400x.
*/
st->dev_id = MX_DEVID_MAX44005;
mx_id_part(st, MX_NAME_MAX44005);
ret = mx_reset_sw(st);
ret |= mx_i2c_rd(st, MX_REG_STS, &val);
if (ret)
return -ENODEV;
if (val != MX_REG_STS_POR)
return -ENODEV;
}
if (st->dev_id == MX_DEVID_MAX44005)
mx_nld_tbl = mx_nld_tbl_44005;
else
mx_nld_tbl = mx_nld_tbl_44006;
st->light.nld_tbl = mx_nld_tbl;
i = st->light.nld_i_lo;
st->cfg[MX_DEV_LIGHT].resolution.ival = mx_nld_tbl[i].resolution.ival;
st->cfg[MX_DEV_LIGHT].resolution.fval = mx_nld_tbl[i].resolution.fval;
i = st->light.nld_i_hi;
st->cfg[MX_DEV_LIGHT].max_range.ival = mx_nld_tbl[i].max_range.ival;
st->cfg[MX_DEV_LIGHT].max_range.fval = mx_nld_tbl[i].max_range.fval;
st->cfg[MX_DEV_LIGHT].delay_us_min = mx_nld_tbl[i].delay_min_ms * 1000;
return ret;
}
static int mx_id_i2c(struct mx_state *st, const char *name)
{
int i;
int ret;
for (i = 0; i < ARRAY_SIZE(mx_i2c_addrs); i++) {
if (st->i2c->addr == mx_i2c_addrs[i])
break;
}
if (i < ARRAY_SIZE(mx_i2c_addrs)) {
st->i2c_addr = st->i2c->addr;
ret = mx_id_dev(st, name);
} else {
name = MX_NAME;
for (i = 0; i < ARRAY_SIZE(mx_i2c_addrs); i++) {
st->i2c_addr = mx_i2c_addrs[i];
ret = mx_id_dev(st, name);
if (!ret)
break;
}
}
if (ret)
st->i2c_addr = 0;
return ret;
}
struct sensor_cfg mx_cfg_dflt[] = {
{
.name = NVS_LIGHT_STRING,
.snsr_id = MX_DEV_LIGHT,
.ch_n = 1,
.ch_sz = 4,
.part = MX_NAME,
.vendor = MX_VENDOR,
.version = MX_LIGHT_VERSION,
.max_range = {
.ival = MX_LIGHT_MAX_RANGE_IVAL,
.fval = MX_LIGHT_MAX_RANGE_MICRO,
},
.resolution = {
.ival = MX_LIGHT_RESOLUTION_IVAL,
.fval = MX_LIGHT_RESOLUTION_MICRO,
},
.milliamp = {
.ival = MX_LIGHT_MILLIAMP_IVAL,
.fval = MX_LIGHT_MILLIAMP_MICRO,
},
.delay_us_min = MX_POLL_DLY_MS_MIN * 1000,
.delay_us_max = MX_POLL_DLY_MS_MAX * 1000,
.flags = SENSOR_FLAG_ON_CHANGE_MODE,
.scale = {
.ival = MX_LIGHT_SCALE_IVAL,
.fval = MX_LIGHT_SCALE_MICRO,
},
.thresh_lo = MX_LIGHT_THRESHOLD_DFLT,
.thresh_hi = MX_LIGHT_THRESHOLD_DFLT,
},
{
.name = NVS_PROXIMITY_STRING,
.ch_n = 1,
.ch_sz = 4,
.part = MX_NAME,
.vendor = MX_VENDOR,
.version = MX_PROX_VERSION,
.max_range = {
.ival = MX_PROX_MAX_RANGE_IVAL,
.fval = MX_PROX_MAX_RANGE_MICRO,
},
.resolution = {
.ival = MX_PROX_RESOLUTION_IVAL,
.fval = MX_PROX_RESOLUTION_MICRO,
},
.milliamp = {
.ival = MX_PROX_MILLIAMP_IVAL,
.fval = MX_PROX_MILLIAMP_MICRO,
},
.delay_us_min = MX_POLL_DLY_MS_MIN * 1000,
.delay_us_max = MX_POLL_DLY_MS_MAX * 1000,
.flags = SENSOR_FLAG_ON_CHANGE_MODE |
SENSOR_FLAG_WAKE_UP,
.scale = {
.ival = MX_PROX_SCALE_IVAL,
.fval = MX_PROX_SCALE_MICRO,
},
.thresh_lo = MX_PROX_THRESHOLD_LO_DFLT,
.thresh_hi = MX_PROX_THRESHOLD_HI_DFLT,
},
};
static int mx_of_dt(struct mx_state *st, struct device_node *dn)
{
unsigned int i;
int ret;
for (i = 0; i < MX_DEV_N; i++)
memcpy(&st->cfg[i], &mx_cfg_dflt[i], sizeof(st->cfg[0]));
st->light.cfg = &st->cfg[MX_DEV_LIGHT];
st->prox.cfg = &st->cfg[MX_DEV_PROX];
/* default device specific parameters */
st->amb_cfg = MX_AMB_CFG_DFLT;
st->prx_cfg = MX_PRX_CFG_DFLT;
/* device tree parameters */
if (dn) {
/* common NVS parameters */
for (i = 0; i < MX_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_ambient_cfg", &st->amb_cfg);
of_property_read_u8(dn, "reg_proximity_cfg", &st->prx_cfg);
of_property_read_u8(dn, "reg_threshold_persist", &st->thr_cfg);
}
/* 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(mx_nld_tbl_44005) - 1;
}
return 0;
}
static int mx_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct mx_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 = mx_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 mx_probe_exit;
}
mx_pm_init(st);
ret = mx_id_i2c(st, id->name);
if (ret) {
dev_err(&client->dev, "%s _id_i2c ERR\n", __func__);
ret = -ENODEV;
goto mx_probe_exit;
}
mx_pm(st, 0);
mx_fn_dev.sts = &st->sts;
mx_fn_dev.errs = &st->errs;
st->nvs = nvs_iio();
if (st->nvs == NULL) {
ret = -ENODEV;
goto mx_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 < MX_DEV_N; i++)
st->cfg[i].flags &= ~SENSOR_FLAG_WAKE_UP;
}
n = 0;
for (i = 0; i < MX_DEV_N; i++) {
if (st->dev_id != MX_DEVID_MAX44005) {
if (st->cfg[i].snsr_id == MX_DEV_PROX) {
st->cfg[i].snsr_id = -1;
continue;
}
}
ret = st->nvs->probe(&st->nvs_st[i], st, &client->dev,
&mx_fn_dev, &st->cfg[i]);
if (!ret)
n++;
}
if (!n) {
dev_err(&client->dev, "%s nvs_probe ERR\n", __func__);
ret = -ENODEV;
goto mx_probe_exit;
}
st->light.nvs_st = st->nvs_st[MX_DEV_LIGHT];
st->prox.nvs_st = st->nvs_st[MX_DEV_PROX];
st->wq = create_workqueue(MX_NAME);
if (!st->wq) {
dev_err(&client->dev, "%s create_workqueue ERR\n", __func__);
ret = -ENOMEM;
goto mx_probe_exit;
}
INIT_WORK(&st->ws, mx_work);
if (client->irq) {
irqflags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
for (i = 0; i < MX_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, mx_irq_thread,
irqflags, MX_NAME, st);
if (ret) {
dev_err(&client->dev, "%s req_threaded_irq ERR %d\n",
__func__, ret);
ret = -ENOMEM;
goto mx_probe_exit;
}
}
dev_info(&client->dev, "%s done\n", __func__);
return 0;
mx_probe_exit:
mx_remove(client);
return ret;
}
static const struct i2c_device_id mx_i2c_device_id[] = {
{ MX_NAME, 0 },
{ MX_NAME_MAX44005, 0 },
{ MX_NAME_MAX44006, 0 },
{ MX_NAME_MAX44008, 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, mx_i2c_device_id);
static const struct of_device_id mx_of_match[] = {
{ .compatible = "maxim,max4400x", },
{ .compatible = "maxim,max44005", },
{ .compatible = "maxim,max44006", },
{ .compatible = "maxim,max44008", },
{},
};
MODULE_DEVICE_TABLE(of, mx_of_match);
static struct i2c_driver mx_driver = {
.class = I2C_CLASS_HWMON,
.probe = mx_probe,
.remove = mx_remove,
.shutdown = mx_shutdown,
.driver = {
.name = MX_NAME,
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(mx_of_match),
.pm = &mx_pm_ops,
},
.id_table = mx_i2c_device_id,
};
module_i2c_driver(mx_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MAX4400x driver");
MODULE_AUTHOR("NVIDIA Corporation");
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