// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright ( c ) 2017 - 2022 Linaro Ltd
* Copyright ( c ) 2010 - 2012 , The Linux Foundation . All rights reserved .
* Copyright ( c ) 2023 - 2024 , Qualcomm Innovation Center , Inc . All rights reserved .
*/
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/led-class -multicolor.h>
#include <linux/module.h>
#include <linux/nvmem-consumer.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/soc/qcom/qcom-pbs.h>
#define LPG_SUBTYPE_REG 0 x05
#define LPG_SUBTYPE_LPG 0 x2
#define LPG_SUBTYPE_PWM 0 xb
#define LPG_SUBTYPE_HI_RES_PWM 0 xc
#define LPG_SUBTYPE_LPG_LITE 0 x11
#define LPG_PATTERN_CONFIG_REG 0 x40
#define LPG_SIZE_CLK_REG 0 x41
#define PWM_CLK_SELECT_MASK GENMASK(1 , 0 )
#define PWM_SIZE_SELECT_MASK BIT(2 )
#define PWM_CLK_SELECT_HI_RES_MASK GENMASK(2 , 0 )
#define PWM_SIZE_HI_RES_MASK GENMASK(6 , 4 )
#define LPG_PREDIV_CLK_REG 0 x42
#define PWM_FREQ_PRE_DIV_MASK GENMASK(6 , 5 )
#define PWM_FREQ_EXP_MASK GENMASK(2 , 0 )
#define PWM_TYPE_CONFIG_REG 0 x43
#define PWM_VALUE_REG 0 x44
#define PWM_ENABLE_CONTROL_REG 0 x46
#define PWM_SYNC_REG 0 x47
#define LPG_RAMP_DURATION_REG 0 x50
#define LPG_HI_PAUSE_REG 0 x52
#define LPG_LO_PAUSE_REG 0 x54
#define LPG_HI_IDX_REG 0 x56
#define LPG_LO_IDX_REG 0 x57
#define PWM_SEC_ACCESS_REG 0 xd0
#define PWM_DTEST_REG(x) (0 xe2 + (x) - 1 )
#define SDAM_REG_PBS_SEQ_EN 0 x42
#define SDAM_PBS_TRIG_SET 0 xe5
#define SDAM_PBS_TRIG_CLR 0 xe6
#define TRI_LED_SRC_SEL 0 x45
#define TRI_LED_EN_CTL 0 x46
#define TRI_LED_ATC_CTL 0 x47
#define LPG_LUT_REG(x) (0 x40 + (x) * 2 )
#define RAMP_CONTROL_REG 0 xc8
#define LPG_RESOLUTION_9BIT BIT(9 )
#define LPG_RESOLUTION_15BIT BIT(15 )
#define PPG_MAX_LED_BRIGHTNESS 255
#define LPG_MAX_M 7
#define LPG_MAX_PREDIV 6
#define DEFAULT_TICK_DURATION_US 7800
#define RAMP_STEP_DURATION(x) (((x) * 1000 / DEFAULT_TICK_DURATION_US) & 0 xff)
#define SDAM_MAX_DEVICES 2
/* LPG common config settings for PPG */
#define SDAM_START_BASE 0 x40
#define SDAM_REG_RAMP_STEP_DURATION 0 x47
#define SDAM_LUT_SDAM_LUT_PATTERN_OFFSET 0 x45
#define SDAM_LPG_SDAM_LUT_PATTERN_OFFSET 0 x80
/* LPG per channel config settings for PPG */
#define SDAM_LUT_EN_OFFSET 0 x0
#define SDAM_PATTERN_CONFIG_OFFSET 0 x1
#define SDAM_END_INDEX_OFFSET 0 x3
#define SDAM_START_INDEX_OFFSET 0 x4
#define SDAM_PBS_SCRATCH_LUT_COUNTER_OFFSET 0 x6
#define SDAM_PAUSE_HI_MULTIPLIER_OFFSET 0 x8
#define SDAM_PAUSE_LO_MULTIPLIER_OFFSET 0 x9
struct lpg_channel;
struct lpg_data;
/**
* struct lpg - LPG device context
* @ dev : pointer to LPG device
* @ map : regmap for register access
* @ lock : used to synchronize LED and pwm callback requests
* @ pwm : PWM - chip object , if operating in PWM mode
* @ data : reference to version specific data
* @ lut_base : base address of the LUT block ( optional )
* @ lut_size : number of entries in the LUT block
* @ lut_bitmap : allocation bitmap for LUT entries
* @ pbs_dev : PBS device
* @ lpg_chan_sdam : LPG SDAM peripheral device
* @ lut_sdam : LUT SDAM peripheral device
* @ pbs_en_bitmap : bitmap for tracking PBS triggers
* @ triled_base : base address of the TRILED block ( optional )
* @ triled_src : power - source for the TRILED
* @ triled_has_atc_ctl : true if there is TRI_LED_ATC_CTL register
* @ triled_has_src_sel : true if there is TRI_LED_SRC_SEL register
* @ channels : list of PWM channels
* @ num_channels : number of @ channels
*/
struct lpg {
struct device *dev;
struct regmap *map;
struct mutex lock;
struct pwm_chip *pwm;
const struct lpg_data *data;
u32 lut_base;
u32 lut_size;
unsigned long *lut_bitmap;
struct pbs_dev *pbs_dev;
struct nvmem_device *lpg_chan_sdam;
struct nvmem_device *lut_sdam;
unsigned long pbs_en_bitmap;
u32 triled_base;
u32 triled_src;
bool triled_has_atc_ctl;
bool triled_has_src_sel;
struct lpg_channel *channels;
unsigned int num_channels;
};
/**
* struct lpg_channel - per channel data
* @ lpg : reference to parent lpg
* @ base : base address of the PWM channel
* @ triled_mask : mask in TRILED to enable this channel
* @ lut_mask : mask in LUT to start pattern generator for this channel
* @ subtype : PMIC hardware block subtype
* @ sdam_offset : channel offset in LPG SDAM
* @ in_use : channel is exposed to LED framework
* @ color : color of the LED attached to this channel
* @ dtest_line : DTEST line for output , or 0 if disabled
* @ dtest_value : DTEST line configuration
* @ pwm_value : duty ( in microseconds ) of the generated pulses , overridden by LUT
* @ enabled : output enabled ?
* @ period : period ( in nanoseconds ) of the generated pulses
* @ clk_sel : reference clock frequency selector
* @ pre_div_sel : divider selector of the reference clock
* @ pre_div_exp : exponential divider of the reference clock
* @ pwm_resolution_sel : pwm resolution selector
* @ ramp_enabled : duty cycle is driven by iterating over lookup table
* @ ramp_ping_pong : reverse through pattern , rather than wrapping to start
* @ ramp_oneshot : perform only a single pass over the pattern
* @ ramp_reverse : iterate over pattern backwards
* @ ramp_tick_ms : length ( in milliseconds ) of one step in the pattern
* @ ramp_lo_pause_ms : pause ( in milliseconds ) before iterating over pattern
* @ ramp_hi_pause_ms : pause ( in milliseconds ) after iterating over pattern
* @ pattern_lo_idx : start index of associated pattern
* @ pattern_hi_idx : last index of associated pattern
*/
struct lpg_channel {
struct lpg *lpg;
u32 base;
unsigned int triled_mask;
unsigned int lut_mask;
unsigned int subtype;
u32 sdam_offset;
bool in_use;
int color;
u32 dtest_line;
u32 dtest_value;
u16 pwm_value;
bool enabled;
u64 period;
unsigned int clk_sel;
unsigned int pre_div_sel;
unsigned int pre_div_exp;
unsigned int pwm_resolution_sel;
bool ramp_enabled;
bool ramp_ping_pong;
bool ramp_oneshot;
bool ramp_reverse;
unsigned short ramp_tick_ms;
unsigned long ramp_lo_pause_ms;
unsigned long ramp_hi_pause_ms;
unsigned int pattern_lo_idx;
unsigned int pattern_hi_idx;
};
/**
* struct lpg_led - logical LED object
* @ lpg : lpg context reference
* @ cdev : LED class device
* @ mcdev : Multicolor LED class device
* @ num_channels : number of @ channels
* @ channels : list of channels associated with the LED
*/
struct lpg_led {
struct lpg *lpg;
struct led_classdev cdev;
struct led_classdev_mc mcdev;
unsigned int num_channels;
struct lpg_channel *channels[] __counted_by(num_channels);
};
/**
* struct lpg_channel_data - per channel initialization data
* @ sdam_offset : Channel offset in LPG SDAM
* @ base : base address for PWM channel registers
* @ triled_mask : bitmask for controlling this channel in TRILED
*/
struct lpg_channel_data {
unsigned int sdam_offset;
unsigned int base;
u8 triled_mask;
};
/**
* struct lpg_data - initialization data
* @ lut_base : base address of LUT block
* @ lut_size : number of entries in LUT
* @ triled_base : base address of TRILED
* @ triled_has_atc_ctl : true if there is TRI_LED_ATC_CTL register
* @ triled_has_src_sel : true if there is TRI_LED_SRC_SEL register
* @ num_channels : number of channels in LPG
* @ channels : list of channel initialization data
*/
struct lpg_data {
unsigned int lut_base;
unsigned int lut_size;
unsigned int triled_base;
bool triled_has_atc_ctl;
bool triled_has_src_sel;
int num_channels;
const struct lpg_channel_data *channels;
};
#define PBS_SW_TRIG_BIT BIT(0 )
static int lpg_clear_pbs_trigger(struct lpg *lpg, unsigned int lut_mask)
{
u8 val = 0 ;
int rc;
if (!lpg->lpg_chan_sdam)
return 0 ;
lpg->pbs_en_bitmap &= (~lut_mask);
if (!lpg->pbs_en_bitmap) {
rc = nvmem_device_write(lpg->lpg_chan_sdam, SDAM_REG_PBS_SEQ_EN, 1 , &val);
if (rc < 0 )
return rc;
if (lpg->lut_sdam) {
val = PBS_SW_TRIG_BIT;
rc = nvmem_device_write(lpg->lpg_chan_sdam, SDAM_PBS_TRIG_CLR, 1 , &val);
if (rc < 0 )
return rc;
}
}
return 0 ;
}
static int lpg_set_pbs_trigger(struct lpg *lpg, unsigned int lut_mask)
{
u8 val = PBS_SW_TRIG_BIT;
int rc;
if (!lpg->lpg_chan_sdam)
return 0 ;
if (!lpg->pbs_en_bitmap) {
rc = nvmem_device_write(lpg->lpg_chan_sdam, SDAM_REG_PBS_SEQ_EN, 1 , &val);
if (rc < 0 )
return rc;
if (lpg->lut_sdam) {
rc = nvmem_device_write(lpg->lpg_chan_sdam, SDAM_PBS_TRIG_SET, 1 , &val);
if (rc < 0 )
return rc;
} else {
rc = qcom_pbs_trigger_event(lpg->pbs_dev, val);
if (rc < 0 )
return rc;
}
}
lpg->pbs_en_bitmap |= lut_mask;
return 0 ;
}
static int lpg_sdam_configure_triggers(struct lpg_channel *chan, u8 set_trig)
{
u32 addr = SDAM_LUT_EN_OFFSET + chan->sdam_offset;
if (!chan->lpg->lpg_chan_sdam)
return 0 ;
return nvmem_device_write(chan->lpg->lpg_chan_sdam, addr, 1 , &set_trig);
}
static int triled_set(struct lpg *lpg, unsigned int mask, unsigned int enable)
{
/* Skip if we don't have a triled block */
if (!lpg->triled_base)
return 0 ;
return regmap_update_bits(lpg->map, lpg->triled_base + TRI_LED_EN_CTL,
mask, enable);
}
static int lpg_lut_store_sdam(struct lpg *lpg, struct led_pattern *pattern,
size_t len, unsigned int *lo_idx, unsigned int *hi_idx)
{
unsigned int idx;
u8 brightness;
int i, rc;
u16 addr;
if (len > lpg->lut_size) {
dev_err(lpg->dev, "Pattern length (%zu) exceeds maximum pattern length (%d)\n" ,
len, lpg->lut_size);
return -EINVAL;
}
idx = bitmap_find_next_zero_area(lpg->lut_bitmap, lpg->lut_size, 0 , len, 0 );
if (idx >= lpg->lut_size)
return -ENOSPC;
for (i = 0 ; i < len; i++) {
brightness = pattern[i].brightness;
if (lpg->lut_sdam) {
addr = SDAM_LUT_SDAM_LUT_PATTERN_OFFSET + i + idx;
rc = nvmem_device_write(lpg->lut_sdam, addr, 1 , &brightness);
} else {
addr = SDAM_LPG_SDAM_LUT_PATTERN_OFFSET + i + idx;
rc = nvmem_device_write(lpg->lpg_chan_sdam, addr, 1 , &brightness);
}
if (rc < 0 )
return rc;
}
bitmap_set(lpg->lut_bitmap, idx, len);
*lo_idx = idx;
*hi_idx = idx + len - 1 ;
return 0 ;
}
static int lpg_lut_store(struct lpg *lpg, struct led_pattern *pattern,
size_t len, unsigned int *lo_idx, unsigned int *hi_idx)
{
unsigned int idx;
u16 val;
int i;
idx = bitmap_find_next_zero_area(lpg->lut_bitmap, lpg->lut_size,
0 , len, 0 );
if (idx >= lpg->lut_size)
return -ENOMEM;
for (i = 0 ; i < len; i++) {
val = pattern[i].brightness;
regmap_bulk_write(lpg->map, lpg->lut_base + LPG_LUT_REG(idx + i),
&val, sizeof (val));
}
bitmap_set(lpg->lut_bitmap, idx, len);
*lo_idx = idx;
*hi_idx = idx + len - 1 ;
return 0 ;
}
static void lpg_lut_free(struct lpg *lpg, unsigned int lo_idx, unsigned int hi_idx)
{
int len;
len = hi_idx - lo_idx + 1 ;
if (len == 1 )
return ;
bitmap_clear(lpg->lut_bitmap, lo_idx, len);
}
static int lpg_lut_sync(struct lpg *lpg, unsigned int mask)
{
if (!lpg->lut_base)
return 0 ;
return regmap_write(lpg->map, lpg->lut_base + RAMP_CONTROL_REG, mask);
}
static const unsigned int lpg_clk_rates[] = {0 , 1024 , 32768 , 19200000 };
static const unsigned int lpg_clk_rates_hi_res[] = {0 , 1024 , 32768 , 19200000 , 76800000 };
static const unsigned int lpg_pre_divs[] = {1 , 3 , 5 , 6 };
static const unsigned int lpg_pwm_resolution[] = {6 , 9 };
static const unsigned int lpg_pwm_resolution_hi_res[] = {8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 };
static int lpg_calc_freq(struct lpg_channel *chan, uint64_t period)
{
unsigned int i, pwm_resolution_count, best_pwm_resolution_sel = 0 ;
const unsigned int *clk_rate_arr, *pwm_resolution_arr;
unsigned int clk_sel, clk_len, best_clk = 0 ;
unsigned int div, best_div = 0 ;
unsigned int m, best_m = 0 ;
unsigned int resolution;
unsigned int error;
unsigned int best_err = UINT_MAX;
u64 max_period, min_period;
u64 best_period = 0 ;
u64 max_res;
/*
* The PWM period is determined by :
*
* resolution * pre_div * 2 ^ M
* period = - - - - - - - - - - - - - - - - - - - - - - - - - -
* refclk
*
* Resolution = 2 ^ { 6 or 9 } bits for PWM or
* 2 ^ { 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 } bits for high resolution PWM
* pre_div = { 1 , 3 , 5 , 6 } and
* M = [ 0 . . 7 ] .
*
* This allows for periods between 3 uS and 384 s for PWM channels and periods between
* 3 uS and 24576 s for high resolution PWMs .
* The PWM framework wants a period of equal or lower length than requested ,
* reject anything below minimum period .
*/
if (chan->subtype == LPG_SUBTYPE_HI_RES_PWM) {
clk_rate_arr = lpg_clk_rates_hi_res;
clk_len = ARRAY_SIZE(lpg_clk_rates_hi_res);
pwm_resolution_arr = lpg_pwm_resolution_hi_res;
pwm_resolution_count = ARRAY_SIZE(lpg_pwm_resolution_hi_res);
max_res = LPG_RESOLUTION_15BIT;
} else {
clk_rate_arr = lpg_clk_rates;
clk_len = ARRAY_SIZE(lpg_clk_rates);
pwm_resolution_arr = lpg_pwm_resolution;
pwm_resolution_count = ARRAY_SIZE(lpg_pwm_resolution);
max_res = LPG_RESOLUTION_9BIT;
}
min_period = div64_u64((u64)NSEC_PER_SEC * ((1 << pwm_resolution_arr[0 ]) - 1 ),
clk_rate_arr[clk_len - 1 ]);
if (period <= min_period)
return -EINVAL;
/* Limit period to largest possible value, to avoid overflows */
max_period = div64_u64((u64)NSEC_PER_SEC * max_res * LPG_MAX_PREDIV * (1 << LPG_MAX_M),
1024 );
if (period > max_period)
period = max_period;
/*
* Search for the pre_div , refclk , resolution and M by solving the rewritten formula
* for each refclk , resolution and pre_div value :
*
* period * refclk
* M = log2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
* NSEC_PER_SEC * pre_div * resolution
*/
for (i = 0 ; i < pwm_resolution_count; i++) {
resolution = (1 << pwm_resolution_arr[i]) - 1 ;
for (clk_sel = 1 ; clk_sel < clk_len; clk_sel++) {
u64 numerator = period * clk_rate_arr[clk_sel];
for (div = 0 ; div < ARRAY_SIZE(lpg_pre_divs); div++) {
u64 denominator = (u64)NSEC_PER_SEC * lpg_pre_divs[div] *
resolution;
u64 actual;
u64 ratio;
if (numerator < denominator)
continue ;
ratio = div64_u64(numerator, denominator);
m = ilog2(ratio);
if (m > LPG_MAX_M)
m = LPG_MAX_M;
actual = DIV_ROUND_UP_ULL(denominator * (1 << m),
clk_rate_arr[clk_sel]);
error = period - actual;
if (error < best_err) {
best_err = error;
best_div = div;
best_m = m;
best_clk = clk_sel;
best_period = actual;
best_pwm_resolution_sel = i;
}
}
}
}
chan->clk_sel = best_clk;
chan->pre_div_sel = best_div;
chan->pre_div_exp = best_m;
chan->period = best_period;
chan->pwm_resolution_sel = best_pwm_resolution_sel;
return 0 ;
}
static void lpg_calc_duty(struct lpg_channel *chan, uint64_t duty)
{
unsigned int max;
unsigned int val;
unsigned int clk_rate;
if (chan->subtype == LPG_SUBTYPE_HI_RES_PWM) {
max = BIT(lpg_pwm_resolution_hi_res[chan->pwm_resolution_sel]) - 1 ;
clk_rate = lpg_clk_rates_hi_res[chan->clk_sel];
} else {
max = BIT(lpg_pwm_resolution[chan->pwm_resolution_sel]) - 1 ;
clk_rate = lpg_clk_rates[chan->clk_sel];
}
val = div64_u64(duty * clk_rate,
(u64)NSEC_PER_SEC * lpg_pre_divs[chan->pre_div_sel] * (1 << chan->pre_div_exp));
chan->pwm_value = min(val, max);
}
static void lpg_apply_freq(struct lpg_channel *chan)
{
unsigned long val;
struct lpg *lpg = chan->lpg;
if (!chan->enabled)
return ;
val = chan->clk_sel;
/* Specify resolution, based on the subtype of the channel */
switch (chan->subtype) {
case LPG_SUBTYPE_LPG:
val |= GENMASK(5 , 4 );
break ;
case LPG_SUBTYPE_PWM:
val |= FIELD_PREP(PWM_SIZE_SELECT_MASK, chan->pwm_resolution_sel);
break ;
case LPG_SUBTYPE_HI_RES_PWM:
val |= FIELD_PREP(PWM_SIZE_HI_RES_MASK, chan->pwm_resolution_sel);
break ;
case LPG_SUBTYPE_LPG_LITE:
default :
val |= BIT(4 );
break ;
}
regmap_write(lpg->map, chan->base + LPG_SIZE_CLK_REG, val);
val = FIELD_PREP(PWM_FREQ_PRE_DIV_MASK, chan->pre_div_sel) |
FIELD_PREP(PWM_FREQ_EXP_MASK, chan->pre_div_exp);
regmap_write(lpg->map, chan->base + LPG_PREDIV_CLK_REG, val);
}
#define LPG_ENABLE_GLITCH_REMOVAL BIT(5 )
static void lpg_enable_glitch(struct lpg_channel *chan)
{
struct lpg *lpg = chan->lpg;
regmap_update_bits(lpg->map, chan->base + PWM_TYPE_CONFIG_REG,
LPG_ENABLE_GLITCH_REMOVAL, 0 );
}
static void lpg_disable_glitch(struct lpg_channel *chan)
{
struct lpg *lpg = chan->lpg;
regmap_update_bits(lpg->map, chan->base + PWM_TYPE_CONFIG_REG,
LPG_ENABLE_GLITCH_REMOVAL,
LPG_ENABLE_GLITCH_REMOVAL);
}
static void lpg_apply_pwm_value(struct lpg_channel *chan)
{
struct lpg *lpg = chan->lpg;
u16 val = chan->pwm_value;
if (!chan->enabled)
return ;
regmap_bulk_write(lpg->map, chan->base + PWM_VALUE_REG, &val, sizeof (val));
}
#define LPG_PATTERN_CONFIG_LO_TO_HI BIT(4 )
#define LPG_PATTERN_CONFIG_REPEAT BIT(3 )
#define LPG_PATTERN_CONFIG_TOGGLE BIT(2 )
#define LPG_PATTERN_CONFIG_PAUSE_HI BIT(1 )
#define LPG_PATTERN_CONFIG_PAUSE_LO BIT(0 )
static void lpg_sdam_apply_lut_control(struct lpg_channel *chan)
{
struct nvmem_device *lpg_chan_sdam = chan->lpg->lpg_chan_sdam;
unsigned int lo_idx = chan->pattern_lo_idx;
unsigned int hi_idx = chan->pattern_hi_idx;
u8 val = 0 , conf = 0 , lut_offset = 0 ;
unsigned int hi_pause, lo_pause;
struct lpg *lpg = chan->lpg;
if (!chan->ramp_enabled || chan->pattern_lo_idx == chan->pattern_hi_idx)
return ;
hi_pause = DIV_ROUND_UP(chan->ramp_hi_pause_ms, chan->ramp_tick_ms);
lo_pause = DIV_ROUND_UP(chan->ramp_lo_pause_ms, chan->ramp_tick_ms);
if (!chan->ramp_oneshot)
conf |= LPG_PATTERN_CONFIG_REPEAT;
if (chan->ramp_hi_pause_ms && lpg->lut_sdam)
conf |= LPG_PATTERN_CONFIG_PAUSE_HI;
if (chan->ramp_lo_pause_ms && lpg->lut_sdam)
conf |= LPG_PATTERN_CONFIG_PAUSE_LO;
if (lpg->lut_sdam) {
lut_offset = SDAM_LUT_SDAM_LUT_PATTERN_OFFSET - SDAM_START_BASE;
hi_idx += lut_offset;
lo_idx += lut_offset;
}
nvmem_device_write(lpg_chan_sdam, SDAM_PBS_SCRATCH_LUT_COUNTER_OFFSET + chan->sdam_offset, 1 , &val);
nvmem_device_write(lpg_chan_sdam, SDAM_PATTERN_CONFIG_OFFSET + chan->sdam_offset, 1 , &conf);
nvmem_device_write(lpg_chan_sdam, SDAM_END_INDEX_OFFSET + chan->sdam_offset, 1 , &hi_idx);
nvmem_device_write(lpg_chan_sdam, SDAM_START_INDEX_OFFSET + chan->sdam_offset, 1 , &lo_idx);
val = RAMP_STEP_DURATION(chan->ramp_tick_ms);
nvmem_device_write(lpg_chan_sdam, SDAM_REG_RAMP_STEP_DURATION, 1 , &val);
if (lpg->lut_sdam) {
nvmem_device_write(lpg_chan_sdam, SDAM_PAUSE_HI_MULTIPLIER_OFFSET + chan->sdam_offset, 1 , &hi_pause);
nvmem_device_write(lpg_chan_sdam, SDAM_PAUSE_LO_MULTIPLIER_OFFSET + chan->sdam_offset, 1 , &lo_pause);
}
}
static void lpg_apply_lut_control(struct lpg_channel *chan)
{
struct lpg *lpg = chan->lpg;
unsigned int hi_pause;
unsigned int lo_pause;
unsigned int conf = 0 ;
unsigned int lo_idx = chan->pattern_lo_idx;
unsigned int hi_idx = chan->pattern_hi_idx;
u16 step = chan->ramp_tick_ms;
if (!chan->ramp_enabled || chan->pattern_lo_idx == chan->pattern_hi_idx)
return ;
hi_pause = DIV_ROUND_UP(chan->ramp_hi_pause_ms, step);
lo_pause = DIV_ROUND_UP(chan->ramp_lo_pause_ms, step);
if (!chan->ramp_reverse)
conf |= LPG_PATTERN_CONFIG_LO_TO_HI;
if (!chan->ramp_oneshot)
conf |= LPG_PATTERN_CONFIG_REPEAT;
if (chan->ramp_ping_pong)
conf |= LPG_PATTERN_CONFIG_TOGGLE;
if (chan->ramp_hi_pause_ms)
conf |= LPG_PATTERN_CONFIG_PAUSE_HI;
if (chan->ramp_lo_pause_ms)
conf |= LPG_PATTERN_CONFIG_PAUSE_LO;
regmap_write(lpg->map, chan->base + LPG_PATTERN_CONFIG_REG, conf);
regmap_write(lpg->map, chan->base + LPG_HI_IDX_REG, hi_idx);
regmap_write(lpg->map, chan->base + LPG_LO_IDX_REG, lo_idx);
regmap_bulk_write(lpg->map, chan->base + LPG_RAMP_DURATION_REG, &step, sizeof (step));
regmap_write(lpg->map, chan->base + LPG_HI_PAUSE_REG, hi_pause);
regmap_write(lpg->map, chan->base + LPG_LO_PAUSE_REG, lo_pause);
}
#define LPG_ENABLE_CONTROL_OUTPUT BIT(7 )
#define LPG_ENABLE_CONTROL_BUFFER_TRISTATE BIT(5 )
#define LPG_ENABLE_CONTROL_SRC_PWM BIT(2 )
#define LPG_ENABLE_CONTROL_RAMP_GEN BIT(1 )
static void lpg_apply_control(struct lpg_channel *chan)
{
unsigned int ctrl;
struct lpg *lpg = chan->lpg;
ctrl = LPG_ENABLE_CONTROL_BUFFER_TRISTATE;
if (chan->enabled)
ctrl |= LPG_ENABLE_CONTROL_OUTPUT;
if (chan->pattern_lo_idx != chan->pattern_hi_idx)
ctrl |= LPG_ENABLE_CONTROL_RAMP_GEN;
else
ctrl |= LPG_ENABLE_CONTROL_SRC_PWM;
regmap_write(lpg->map, chan->base + PWM_ENABLE_CONTROL_REG, ctrl);
/*
* Due to LPG hardware bug , in the PWM mode , having enabled PWM ,
* We have to write PWM values one more time .
*/
if (chan->enabled)
lpg_apply_pwm_value(chan);
}
#define LPG_SYNC_PWM BIT(0 )
static void lpg_apply_sync(struct lpg_channel *chan)
{
struct lpg *lpg = chan->lpg;
regmap_write(lpg->map, chan->base + PWM_SYNC_REG, LPG_SYNC_PWM);
}
static int lpg_parse_dtest(struct lpg *lpg)
{
struct lpg_channel *chan;
struct device_node *np = lpg->dev->of_node;
int count;
int ret;
int i;
count = of_property_count_u32_elems(np, "qcom,dtest" );
if (count == -EINVAL) {
return 0 ;
} else if (count < 0 ) {
ret = count;
goto err_malformed;
} else if (count != lpg->data->num_channels * 2 ) {
return dev_err_probe(lpg->dev, -EINVAL,
"qcom,dtest needs to be %d items\n" ,
lpg->data->num_channels * 2 );
}
for (i = 0 ; i < lpg->data->num_channels; i++) {
chan = &lpg->channels[i];
ret = of_property_read_u32_index(np, "qcom,dtest" , i * 2 ,
&chan->dtest_line);
if (ret)
goto err_malformed;
ret = of_property_read_u32_index(np, "qcom,dtest" , i * 2 + 1 ,
&chan->dtest_value);
if (ret)
goto err_malformed;
}
return 0 ;
err_malformed:
return dev_err_probe(lpg->dev, ret, "malformed qcom,dtest\n" );
}
static void lpg_apply_dtest(struct lpg_channel *chan)
{
struct lpg *lpg = chan->lpg;
if (!chan->dtest_line)
return ;
regmap_write(lpg->map, chan->base + PWM_SEC_ACCESS_REG, 0 xa5);
regmap_write(lpg->map, chan->base + PWM_DTEST_REG(chan->dtest_line),
chan->dtest_value);
}
static void lpg_apply(struct lpg_channel *chan)
{
lpg_disable_glitch(chan);
lpg_apply_freq(chan);
lpg_apply_pwm_value(chan);
lpg_apply_control(chan);
lpg_apply_sync(chan);
if (chan->lpg->lpg_chan_sdam)
lpg_sdam_apply_lut_control(chan);
else
lpg_apply_lut_control(chan);
lpg_enable_glitch(chan);
}
static void lpg_brightness_set(struct lpg_led *led, struct led_classdev *cdev,
struct mc_subled *subleds)
{
enum led_brightness brightness;
struct lpg_channel *chan;
unsigned int triled_enabled = 0 ;
unsigned int triled_mask = 0 ;
unsigned int lut_mask = 0 ;
unsigned int duty;
struct lpg *lpg = led->lpg;
int i;
for (i = 0 ; i < led->num_channels; i++) {
chan = led->channels[i];
brightness = subleds[i].brightness;
if (brightness == LED_OFF) {
chan->enabled = false ;
chan->ramp_enabled = false ;
} else if (chan->pattern_lo_idx != chan->pattern_hi_idx) {
lpg_calc_freq(chan, NSEC_PER_MSEC);
lpg_sdam_configure_triggers(chan, 1 );
chan->enabled = true ;
chan->ramp_enabled = true ;
lut_mask |= chan->lut_mask;
triled_enabled |= chan->triled_mask;
} else {
lpg_calc_freq(chan, NSEC_PER_MSEC);
duty = div_u64(brightness * chan->period, cdev->max_brightness);
lpg_calc_duty(chan, duty);
chan->enabled = true ;
chan->ramp_enabled = false ;
triled_enabled |= chan->triled_mask;
}
triled_mask |= chan->triled_mask;
lpg_apply(chan);
}
/* Toggle triled lines */
if (triled_mask)
triled_set(lpg, triled_mask, triled_enabled);
/* Trigger start of ramp generator(s) */
if (lut_mask) {
lpg_lut_sync(lpg, lut_mask);
lpg_set_pbs_trigger(lpg, lut_mask);
}
}
static int lpg_brightness_single_set(struct led_classdev *cdev,
enum led_brightness value)
{
struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
struct mc_subled info;
mutex_lock(&led->lpg->lock);
info.brightness = value;
lpg_brightness_set(led, cdev, &info);
mutex_unlock(&led->lpg->lock);
return 0 ;
}
static int lpg_brightness_mc_set(struct led_classdev *cdev,
enum led_brightness value)
{
struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
mutex_lock(&led->lpg->lock);
led_mc_calc_color_components(mc, value);
lpg_brightness_set(led, cdev, mc->subled_info);
mutex_unlock(&led->lpg->lock);
return 0 ;
}
static int lpg_blink_set(struct lpg_led *led,
unsigned long *delay_on, unsigned long *delay_off)
{
struct lpg_channel *chan;
unsigned int period;
unsigned int triled_mask = 0 ;
struct lpg *lpg = led->lpg;
u64 duty;
int i;
if (!*delay_on && !*delay_off) {
*delay_on = 500 ;
*delay_off = 500 ;
}
duty = *delay_on * NSEC_PER_MSEC;
period = (*delay_on + *delay_off) * NSEC_PER_MSEC;
for (i = 0 ; i < led->num_channels; i++) {
chan = led->channels[i];
lpg_calc_freq(chan, period);
lpg_calc_duty(chan, duty);
chan->enabled = true ;
chan->ramp_enabled = false ;
triled_mask |= chan->triled_mask;
lpg_apply(chan);
}
/* Enable triled lines */
triled_set(lpg, triled_mask, triled_mask);
chan = led->channels[0 ];
duty = div_u64(chan->pwm_value * chan->period, LPG_RESOLUTION_9BIT);
*delay_on = div_u64(duty, NSEC_PER_MSEC);
*delay_off = div_u64(chan->period - duty, NSEC_PER_MSEC);
return 0 ;
}
static int lpg_blink_single_set(struct led_classdev *cdev,
unsigned long *delay_on, unsigned long *delay_off)
{
struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
int ret;
mutex_lock(&led->lpg->lock);
ret = lpg_blink_set(led, delay_on, delay_off);
mutex_unlock(&led->lpg->lock);
return ret;
}
static int lpg_blink_mc_set(struct led_classdev *cdev,
unsigned long *delay_on, unsigned long *delay_off)
{
struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
int ret;
mutex_lock(&led->lpg->lock);
ret = lpg_blink_set(led, delay_on, delay_off);
mutex_unlock(&led->lpg->lock);
return ret;
}
static int lpg_pattern_set(struct lpg_led *led, struct led_pattern *led_pattern,
u32 len, int repeat)
{
struct lpg_channel *chan;
struct lpg *lpg = led->lpg;
struct led_pattern *pattern;
unsigned int brightness_a;
unsigned int brightness_b;
unsigned int hi_pause = 0 ;
unsigned int lo_pause = 0 ;
unsigned int actual_len;
unsigned int delta_t;
unsigned int lo_idx;
unsigned int hi_idx;
unsigned int i;
bool ping_pong = true ;
int ret = -EINVAL;
/* Hardware only support oneshot or indefinite loops */
if (repeat != -1 && repeat != 1 )
return -EINVAL;
/*
* The standardized leds - trigger - pattern format defines that the
* brightness of the LED follows a linear transition from one entry
* in the pattern to the next , over the given delta_t time . It
* describes that the way to perform instant transitions a zero - length
* entry should be added following a pattern entry .
*
* The LPG hardware is only able to perform the latter ( no linear
* transitions ) , so require each entry in the pattern to be followed by
* a zero - length transition .
*/
if (len % 2 )
return -EINVAL;
pattern = kcalloc(len / 2 , sizeof (*pattern), GFP_KERNEL);
if (!pattern)
return -ENOMEM;
for (i = 0 ; i < len; i += 2 ) {
if (led_pattern[i].brightness != led_pattern[i + 1 ].brightness)
goto out_free_pattern;
if (led_pattern[i + 1 ].delta_t != 0 )
goto out_free_pattern;
pattern[i / 2 ].brightness = led_pattern[i].brightness;
pattern[i / 2 ].delta_t = led_pattern[i].delta_t;
}
len /= 2 ;
/*
* Specifying a pattern of length 1 causes the hardware to iterate
* through the entire LUT , so prohibit this .
*/
if (len < 2 )
goto out_free_pattern;
/*
* The LPG plays patterns with at a fixed pace , a " low pause " can be
* used to stretch the first delay of the pattern and a " high pause "
* the last one .
*
* In order to save space the pattern can be played in " ping pong "
* mode , in which the pattern is first played forward , then " high
* pause " is applied , then the pattern is played backwards and finally
* the " low pause " is applied .
*
* The middle elements of the pattern are used to determine delta_t and
* the " low pause " and " high pause " multipliers are derrived from this .
*
* The first element in the pattern is used to determine " low pause " .
*
* If the specified pattern is a palindrome the ping pong mode is
* enabled . In this scenario the delta_t of the middle entry ( i . e . the
* last in the programmed pattern ) determines the " high pause " .
*
* SDAM - based devices do not support " ping pong " , and only supports
* " low pause " and " high pause " with a dedicated SDAM LUT .
*/
/* Detect palindromes and use "ping pong" to reduce LUT usage */
if (lpg->lut_base) {
for (i = 0 ; i < len / 2 ; i++) {
brightness_a = pattern[i].brightness;
brightness_b = pattern[len - i - 1 ].brightness;
if (brightness_a != brightness_b) {
ping_pong = false ;
break ;
}
}
} else
ping_pong = false ;
/* The pattern length to be written to the LUT */
if (ping_pong)
actual_len = (len + 1 ) / 2 ;
else
actual_len = len;
/*
* Validate that all delta_t in the pattern are the same , with the
* exception of the middle element in case of ping_pong .
*/
delta_t = pattern[1 ].delta_t;
for (i = 2 ; i < len; i++) {
if (pattern[i].delta_t != delta_t) {
/*
* Allow last entry in the full or shortened pattern to
* specify hi pause . Reject other variations .
*/
if (i != actual_len - 1 )
goto out_free_pattern;
}
}
/* LPG_RAMP_DURATION_REG is a 9bit */
if (delta_t >= BIT(9 ))
goto out_free_pattern;
/*
* Find " low pause " and " high pause " in the pattern in the LUT case .
* SDAM - based devices without dedicated LUT SDAM require equal
* duration of all steps .
*/
if (lpg->lut_base || lpg->lut_sdam) {
lo_pause = pattern[0 ].delta_t;
hi_pause = pattern[actual_len - 1 ].delta_t;
} else {
if (delta_t != pattern[0 ].delta_t || delta_t != pattern[actual_len - 1 ].delta_t)
goto out_free_pattern;
}
mutex_lock(&lpg->lock);
if (lpg->lut_base)
ret = lpg_lut_store(lpg, pattern, actual_len, &lo_idx, &hi_idx);
else
ret = lpg_lut_store_sdam(lpg, pattern, actual_len, &lo_idx, &hi_idx);
if (ret < 0 )
goto out_unlock;
for (i = 0 ; i < led->num_channels; i++) {
chan = led->channels[i];
chan->ramp_tick_ms = delta_t;
chan->ramp_ping_pong = ping_pong;
chan->ramp_oneshot = repeat != -1 ;
chan->ramp_lo_pause_ms = lo_pause;
chan->ramp_hi_pause_ms = hi_pause;
chan->pattern_lo_idx = lo_idx;
chan->pattern_hi_idx = hi_idx;
}
out_unlock:
mutex_unlock(&lpg->lock);
out_free_pattern:
kfree(pattern);
return ret;
}
static int lpg_pattern_single_set(struct led_classdev *cdev,
struct led_pattern *pattern, u32 len,
int repeat)
{
struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
int ret;
ret = lpg_pattern_set(led, pattern, len, repeat);
if (ret < 0 )
return ret;
lpg_brightness_single_set(cdev, LED_FULL);
return 0 ;
}
static int lpg_pattern_mc_set(struct led_classdev *cdev,
struct led_pattern *pattern, u32 len,
int repeat)
{
struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
unsigned int triled_mask = 0 ;
int ret, i;
for (i = 0 ; i < led->num_channels; i++)
triled_mask |= led->channels[i]->triled_mask;
triled_set(led->lpg, triled_mask, 0 );
ret = lpg_pattern_set(led, pattern, len, repeat);
if (ret < 0 )
return ret;
led_mc_calc_color_components(mc, LED_FULL);
lpg_brightness_set(led, cdev, mc->subled_info);
return 0 ;
}
static int lpg_pattern_clear(struct lpg_led *led)
{
struct lpg_channel *chan;
struct lpg *lpg = led->lpg;
int i;
mutex_lock(&lpg->lock);
chan = led->channels[0 ];
lpg_lut_free(lpg, chan->pattern_lo_idx, chan->pattern_hi_idx);
for (i = 0 ; i < led->num_channels; i++) {
chan = led->channels[i];
lpg_sdam_configure_triggers(chan, 0 );
lpg_clear_pbs_trigger(chan->lpg, chan->lut_mask);
chan->pattern_lo_idx = 0 ;
chan->pattern_hi_idx = 0 ;
}
mutex_unlock(&lpg->lock);
return 0 ;
}
static int lpg_pattern_single_clear(struct led_classdev *cdev)
{
struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
return lpg_pattern_clear(led);
}
static int lpg_pattern_mc_clear(struct led_classdev *cdev)
{
struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
return lpg_pattern_clear(led);
}
static inline struct lpg *lpg_pwm_from_chip(struct pwm_chip *chip)
{
return pwmchip_get_drvdata(chip);
}
static int lpg_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct lpg *lpg = lpg_pwm_from_chip(chip);
struct lpg_channel *chan = &lpg->channels[pwm->hwpwm];
return chan->in_use ? -EBUSY : 0 ;
}
/*
* Limitations :
* - Updating both duty and period is not done atomically , so the output signal
* will momentarily be a mix of the settings .
* - Changed parameters takes effect immediately .
* - A disabled channel outputs a logical 0 .
*/
static int lpg_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
const struct pwm_state *state)
{
struct lpg *lpg = lpg_pwm_from_chip(chip);
struct lpg_channel *chan = &lpg->channels[pwm->hwpwm];
int ret = 0 ;
if (state->polarity != PWM_POLARITY_NORMAL)
return -EINVAL;
mutex_lock(&lpg->lock);
if (state->enabled) {
ret = lpg_calc_freq(chan, state->period);
if (ret < 0 )
goto out_unlock;
lpg_calc_duty(chan, state->duty_cycle);
}
chan->enabled = state->enabled;
lpg_apply(chan);
triled_set(lpg, chan->triled_mask, chan->enabled ? chan->triled_mask : 0 );
out_unlock:
mutex_unlock(&lpg->lock);
return ret;
}
static int lpg_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
struct pwm_state *state)
{
struct lpg *lpg = lpg_pwm_from_chip(chip);
struct lpg_channel *chan = &lpg->channels[pwm->hwpwm];
unsigned int resolution;
unsigned int pre_div;
unsigned int refclk;
unsigned int val;
unsigned int m;
u16 pwm_value;
int ret;
ret = regmap_read(lpg->map, chan->base + LPG_SIZE_CLK_REG, &val);
if (ret)
return ret;
if (chan->subtype == LPG_SUBTYPE_HI_RES_PWM) {
refclk = lpg_clk_rates_hi_res[FIELD_GET(PWM_CLK_SELECT_HI_RES_MASK, val)];
resolution = lpg_pwm_resolution_hi_res[FIELD_GET(PWM_SIZE_HI_RES_MASK, val)];
} else {
refclk = lpg_clk_rates[FIELD_GET(PWM_CLK_SELECT_MASK, val)];
resolution = lpg_pwm_resolution[FIELD_GET(PWM_SIZE_SELECT_MASK, val)];
}
if (refclk) {
ret = regmap_read(lpg->map, chan->base + LPG_PREDIV_CLK_REG, &val);
if (ret)
return ret;
pre_div = lpg_pre_divs[FIELD_GET(PWM_FREQ_PRE_DIV_MASK, val)];
m = FIELD_GET(PWM_FREQ_EXP_MASK, val);
ret = regmap_bulk_read(lpg->map, chan->base + PWM_VALUE_REG, &pwm_value, sizeof (pwm_value));
if (ret)
return ret;
state->period = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC * ((1 << resolution) - 1 ) *
pre_div * (1 << m), refclk);
state->duty_cycle = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC * pwm_value * pre_div * (1 << m), refclk);
} else {
state->period = 0 ;
state->duty_cycle = 0 ;
}
ret = regmap_read(lpg->map, chan->base + PWM_ENABLE_CONTROL_REG, &val);
if (ret)
return ret;
state->enabled = FIELD_GET(LPG_ENABLE_CONTROL_OUTPUT, val);
state->polarity = PWM_POLARITY_NORMAL;
if (state->duty_cycle > state->period)
state->duty_cycle = state->period;
return 0 ;
}
static const struct pwm_ops lpg_pwm_ops = {
.request = lpg_pwm_request,
.apply = lpg_pwm_apply,
.get_state = lpg_pwm_get_state,
};
static int lpg_add_pwm(struct lpg *lpg)
{
struct pwm_chip *chip;
int ret;
lpg->pwm = chip = devm_pwmchip_alloc(lpg->dev, lpg->num_channels, 0 );
if (IS_ERR(chip))
return PTR_ERR(chip);
chip->ops = &lpg_pwm_ops;
pwmchip_set_drvdata(chip, lpg);
ret = devm_pwmchip_add(lpg->dev, chip);
if (ret)
dev_err_probe(lpg->dev, ret, "failed to add PWM chip\n" );
return ret;
}
static int lpg_parse_channel(struct lpg *lpg, struct device_node *np,
struct lpg_channel **channel)
{
struct lpg_channel *chan;
u32 color = LED_COLOR_ID_GREEN;
u32 reg;
int ret;
ret = of_property_read_u32(np, "reg" , ®);
if (ret || !reg || reg > lpg->num_channels)
return dev_err_probe(lpg->dev, -EINVAL, "invalid \" reg\" of %pOFn\n" , np);
chan = &lpg->channels[reg - 1 ];
chan->in_use = true ;
ret = of_property_read_u32(np, "color" , &color);
if (ret < 0 && ret != -EINVAL)
return dev_err_probe(lpg->dev, ret,
"failed to parse \" color\" of %pOF\n" , np);
chan->color = color;
*channel = chan;
return 0 ;
}
static int lpg_add_led(struct lpg *lpg, struct device_node *np)
{
struct led_init_data init_data = {};
struct led_classdev *cdev;
struct mc_subled *info;
struct lpg_led *led;
const char *state;
int num_channels;
u32 color = 0 ;
int ret;
int i;
ret = of_property_read_u32(np, "color" , &color);
if (ret < 0 && ret != -EINVAL)
return dev_err_probe(lpg->dev, ret,
"failed to parse \" color\" of %pOF\n" , np);
if (color == LED_COLOR_ID_RGB)
num_channels = of_get_available_child_count(np);
else
num_channels = 1 ;
led = devm_kzalloc(lpg->dev, struct_size(led, channels, num_channels), GFP_KERNEL);
if (!led)
return -ENOMEM;
led->lpg = lpg;
led->num_channels = num_channels;
if (color == LED_COLOR_ID_RGB) {
info = devm_kcalloc(lpg->dev, num_channels, sizeof (*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
i = 0 ;
for_each_available_child_of_node_scoped(np, child) {
ret = lpg_parse_channel(lpg, child, &led->channels[i]);
if (ret < 0 )
return ret;
info[i].color_index = led->channels[i]->color;
info[i].intensity = 0 ;
i++;
}
led->mcdev.subled_info = info;
led->mcdev.num_colors = num_channels;
cdev = &led->mcdev.led_cdev;
cdev->brightness_set_blocking = lpg_brightness_mc_set;
cdev->blink_set = lpg_blink_mc_set;
/* Register pattern accessors if we have a LUT block or when using PPG */
if (lpg->lut_base || lpg->lpg_chan_sdam) {
cdev->pattern_set = lpg_pattern_mc_set;
cdev->pattern_clear = lpg_pattern_mc_clear;
}
} else {
ret = lpg_parse_channel(lpg, np, &led->channels[0 ]);
if (ret < 0 )
return ret;
cdev = &led->cdev;
cdev->brightness_set_blocking = lpg_brightness_single_set;
cdev->blink_set = lpg_blink_single_set;
/* Register pattern accessors if we have a LUT block or when using PPG */
if (lpg->lut_base || lpg->lpg_chan_sdam) {
cdev->pattern_set = lpg_pattern_single_set;
cdev->pattern_clear = lpg_pattern_single_clear;
}
}
cdev->default_trigger = of_get_property(np, "linux,default-trigger" , NULL);
if (lpg->lpg_chan_sdam)
cdev->max_brightness = PPG_MAX_LED_BRIGHTNESS;
else
cdev->max_brightness = LPG_RESOLUTION_9BIT - 1 ;
if (!of_property_read_string(np, "default-state" , &state) &&
!strcmp(state, "on" ))
cdev->brightness = cdev->max_brightness;
else
cdev->brightness = LED_OFF;
cdev->brightness_set_blocking(cdev, cdev->brightness);
init_data.fwnode = of_fwnode_handle(np);
if (color == LED_COLOR_ID_RGB)
ret = devm_led_classdev_multicolor_register_ext(lpg->dev, &led->mcdev, &init_data);
else
ret = devm_led_classdev_register_ext(lpg->dev, &led->cdev, &init_data);
if (ret)
dev_err_probe(lpg->dev, ret, "unable to register %s\n" , cdev->name);
return ret;
}
static int lpg_init_channels(struct lpg *lpg)
{
const struct lpg_data *data = lpg->data;
struct lpg_channel *chan;
int i;
lpg->num_channels = data->num_channels;
lpg->channels = devm_kcalloc(lpg->dev, data->num_channels,
sizeof (struct lpg_channel), GFP_KERNEL);
if (!lpg->channels)
return -ENOMEM;
for (i = 0 ; i < data->num_channels; i++) {
chan = &lpg->channels[i];
chan->lpg = lpg;
chan->base = data->channels[i].base;
chan->triled_mask = data->channels[i].triled_mask;
chan->lut_mask = BIT(i);
chan->sdam_offset = data->channels[i].sdam_offset;
regmap_read(lpg->map, chan->base + LPG_SUBTYPE_REG, &chan->subtype);
}
return 0 ;
}
static int lpg_init_triled(struct lpg *lpg)
{
struct device_node *np = lpg->dev->of_node;
int ret;
/* Skip initialization if we don't have a triled block */
if (!lpg->data->triled_base)
return 0 ;
lpg->triled_base = lpg->data->triled_base;
lpg->triled_has_atc_ctl = lpg->data->triled_has_atc_ctl;
lpg->triled_has_src_sel = lpg->data->triled_has_src_sel;
if (lpg->triled_has_src_sel) {
ret = of_property_read_u32(np, "qcom,power-source" , &lpg->triled_src);
if (ret || lpg->triled_src == 2 || lpg->triled_src > 3 )
return dev_err_probe(lpg->dev, -EINVAL,
"invalid power source\n" );
}
/* Disable automatic trickle charge LED */
if (lpg->triled_has_atc_ctl)
regmap_write(lpg->map, lpg->triled_base + TRI_LED_ATC_CTL, 0 );
/* Configure power source */
if (lpg->triled_has_src_sel)
regmap_write(lpg->map, lpg->triled_base + TRI_LED_SRC_SEL, lpg->triled_src);
/* Default all outputs to off */
regmap_write(lpg->map, lpg->triled_base + TRI_LED_EN_CTL, 0 );
return 0 ;
}
static int lpg_init_lut(struct lpg *lpg)
{
const struct lpg_data *data = lpg->data;
if (!data->lut_size)
return 0 ;
lpg->lut_size = data->lut_size;
if (data->lut_base)
lpg->lut_base = data->lut_base;
lpg->lut_bitmap = devm_bitmap_zalloc(lpg->dev, lpg->lut_size, GFP_KERNEL);
if (!lpg->lut_bitmap)
return -ENOMEM;
return 0 ;
}
static int lpg_init_sdam(struct lpg *lpg)
{
int i, sdam_count, rc;
u8 val = 0 ;
sdam_count = of_property_count_strings(lpg->dev->of_node, "nvmem-names" );
if (sdam_count <= 0 )
return 0 ;
if (sdam_count > SDAM_MAX_DEVICES)
return -EINVAL;
/* Get the 1st SDAM device for LPG/LUT config */
lpg->lpg_chan_sdam = devm_nvmem_device_get(lpg->dev, "lpg_chan_sdam" );
if (IS_ERR(lpg->lpg_chan_sdam))
return dev_err_probe(lpg->dev, PTR_ERR(lpg->lpg_chan_sdam),
"Failed to get LPG chan SDAM device\n" );
if (sdam_count == 1 ) {
/* Get PBS device node if single SDAM device */
lpg->pbs_dev = get_pbs_client_device(lpg->dev);
if (IS_ERR(lpg->pbs_dev))
return dev_err_probe(lpg->dev, PTR_ERR(lpg->pbs_dev),
"Failed to get PBS client device\n" );
} else if (sdam_count == 2 ) {
/* Get the 2nd SDAM device for LUT pattern */
lpg->lut_sdam = devm_nvmem_device_get(lpg->dev, "lut_sdam" );
if (IS_ERR(lpg->lut_sdam))
return dev_err_probe(lpg->dev, PTR_ERR(lpg->lut_sdam),
"Failed to get LPG LUT SDAM device\n" );
}
for (i = 0 ; i < lpg->num_channels; i++) {
struct lpg_channel *chan = &lpg->channels[i];
if (chan->sdam_offset) {
rc = nvmem_device_write(lpg->lpg_chan_sdam,
SDAM_PBS_SCRATCH_LUT_COUNTER_OFFSET + chan->sdam_offset, 1 , &val);
if (rc < 0 )
return rc;
rc = lpg_sdam_configure_triggers(chan, 0 );
if (rc < 0 )
return rc;
rc = lpg_clear_pbs_trigger(chan->lpg, chan->lut_mask);
if (rc < 0 )
return rc;
}
}
return 0 ;
}
static int lpg_probe(struct platform_device *pdev)
{
struct lpg *lpg;
int ret;
int i;
lpg = devm_kzalloc(&pdev->dev, sizeof (*lpg), GFP_KERNEL);
if (!lpg)
return -ENOMEM;
lpg->data = of_device_get_match_data(&pdev->dev);
if (!lpg->data)
return -EINVAL;
lpg->dev = &pdev->dev;
mutex_init(&lpg->lock);
lpg->map = dev_get_regmap(pdev->dev.parent, NULL);
if (!lpg->map)
return dev_err_probe(&pdev->dev, -ENXIO, "parent regmap unavailable\n" );
ret = lpg_init_channels(lpg);
if (ret < 0 )
return ret;
ret = lpg_parse_dtest(lpg);
if (ret < 0 )
return ret;
ret = lpg_init_triled(lpg);
if (ret < 0 )
return ret;
ret = lpg_init_sdam(lpg);
if (ret < 0 )
return ret;
ret = lpg_init_lut(lpg);
if (ret < 0 )
return ret;
for_each_available_child_of_node_scoped(pdev->dev.of_node, np) {
ret = lpg_add_led(lpg, np);
if (ret)
return ret;
}
for (i = 0 ; i < lpg->num_channels; i++)
lpg_apply_dtest(&lpg->channels[i]);
return lpg_add_pwm(lpg);
}
static const struct lpg_data pm660l_lpg_data = {
.lut_base = 0 xb000,
.lut_size = 49 ,
.triled_base = 0 xd000,
.triled_has_atc_ctl = true ,
.triled_has_src_sel = true ,
.num_channels = 4 ,
.channels = (const struct lpg_channel_data[]) {
{ .base = 0 xb100, .triled_mask = BIT(5 ) },
{ .base = 0 xb200, .triled_mask = BIT(6 ) },
{ .base = 0 xb300, .triled_mask = BIT(7 ) },
{ .base = 0 xb400 },
},
};
static const struct lpg_data pm8916_pwm_data = {
.num_channels = 1 ,
.channels = (const struct lpg_channel_data[]) {
{ .base = 0 xbc00 },
},
};
static const struct lpg_data pm8941_lpg_data = {
.lut_base = 0 xb000,
.lut_size = 64 ,
.triled_base = 0 xd000,
.triled_has_atc_ctl = true ,
.triled_has_src_sel = true ,
.num_channels = 8 ,
.channels = (const struct lpg_channel_data[]) {
{ .base = 0 xb100 },
{ .base = 0 xb200 },
{ .base = 0 xb300 },
{ .base = 0 xb400 },
{ .base = 0 xb500, .triled_mask = BIT(5 ) },
{ .base = 0 xb600, .triled_mask = BIT(6 ) },
{ .base = 0 xb700, .triled_mask = BIT(7 ) },
{ .base = 0 xb800 },
},
};
static const struct lpg_data pmi8950_pwm_data = {
.num_channels = 1 ,
.channels = (const struct lpg_channel_data[]) {
{ .base = 0 xb000 },
},
};
static const struct lpg_data pm8994_lpg_data = {
.lut_base = 0 xb000,
.lut_size = 64 ,
.num_channels = 6 ,
.channels = (const struct lpg_channel_data[]) {
{ .base = 0 xb100 },
{ .base = 0 xb200 },
{ .base = 0 xb300 },
{ .base = 0 xb400 },
{ .base = 0 xb500 },
{ .base = 0 xb600 },
},
};
/* PMI632 uses SDAM instead of LUT for pattern */
static const struct lpg_data pmi632_lpg_data = {
.triled_base = 0 xd000,
.lut_size = 64 ,
.num_channels = 5 ,
.channels = (const struct lpg_channel_data[]) {
{ .base = 0 xb300, .triled_mask = BIT(7 ), .sdam_offset = 0 x48 },
{ .base = 0 xb400, .triled_mask = BIT(6 ), .sdam_offset = 0 x56 },
{ .base = 0 xb500, .triled_mask = BIT(5 ), .sdam_offset = 0 x64 },
{ .base = 0 xb600 },
{ .base = 0 xb700 },
},
};
static const struct lpg_data pmi8994_lpg_data = {
.lut_base = 0 xb000,
.lut_size = 24 ,
.triled_base = 0 xd000,
.triled_has_atc_ctl = true ,
.triled_has_src_sel = true ,
.num_channels = 4 ,
.channels = (const struct lpg_channel_data[]) {
{ .base = 0 xb100, .triled_mask = BIT(5 ) },
{ .base = 0 xb200, .triled_mask = BIT(6 ) },
{ .base = 0 xb300, .triled_mask = BIT(7 ) },
{ .base = 0 xb400 },
},
};
static const struct lpg_data pmi8998_lpg_data = {
.lut_base = 0 xb000,
.lut_size = 49 ,
.triled_base = 0 xd000,
.num_channels = 6 ,
.channels = (const struct lpg_channel_data[]) {
{ .base = 0 xb100 },
{ .base = 0 xb200 },
{ .base = 0 xb300, .triled_mask = BIT(5 ) },
{ .base = 0 xb400, .triled_mask = BIT(6 ) },
{ .base = 0 xb500, .triled_mask = BIT(7 ) },
{ .base = 0 xb600 },
},
};
static const struct lpg_data pm8150b_lpg_data = {
.lut_base = 0 xb000,
.lut_size = 24 ,
.triled_base = 0 xd000,
.num_channels = 2 ,
.channels = (const struct lpg_channel_data[]) {
{ .base = 0 xb100, .triled_mask = BIT(7 ) },
{ .base = 0 xb200, .triled_mask = BIT(6 ) },
},
};
static const struct lpg_data pm8150l_lpg_data = {
.lut_base = 0 xb000,
.lut_size = 48 ,
.triled_base = 0 xd000,
.num_channels = 5 ,
.channels = (const struct lpg_channel_data[]) {
{ .base = 0 xb100, .triled_mask = BIT(7 ) },
{ .base = 0 xb200, .triled_mask = BIT(6 ) },
{ .base = 0 xb300, .triled_mask = BIT(5 ) },
{ .base = 0 xbc00 },
{ .base = 0 xbd00 },
},
};
static const struct lpg_data pm8350c_pwm_data = {
.triled_base = 0 xef00,
.lut_size = 122 ,
.num_channels = 4 ,
.channels = (const struct lpg_channel_data[]) {
{ .base = 0 xe800, .triled_mask = BIT(7 ), .sdam_offset = 0 x48 },
{ .base = 0 xe900, .triled_mask = BIT(6 ), .sdam_offset = 0 x56 },
{ .base = 0 xea00, .triled_mask = BIT(5 ), .sdam_offset = 0 x64 },
{ .base = 0 xeb00 },
},
};
static const struct lpg_data pmk8550_pwm_data = {
.num_channels = 2 ,
.channels = (const struct lpg_channel_data[]) {
{ .base = 0 xe800 },
{ .base = 0 xe900 },
},
};
static const struct of_device_id lpg_of_table[] = {
{ .compatible = "qcom,pm660l-lpg" , .data = &pm660l_lpg_data },
{ .compatible = "qcom,pm8150b-lpg" , .data = &pm8150b_lpg_data },
{ .compatible = "qcom,pm8150l-lpg" , .data = &pm8150l_lpg_data },
{ .compatible = "qcom,pm8350c-pwm" , .data = &pm8350c_pwm_data },
{ .compatible = "qcom,pm8916-pwm" , .data = &pm8916_pwm_data },
{ .compatible = "qcom,pm8941-lpg" , .data = &pm8941_lpg_data },
{ .compatible = "qcom,pm8994-lpg" , .data = &pm8994_lpg_data },
{ .compatible = "qcom,pmi632-lpg" , .data = &pmi632_lpg_data },
{ .compatible = "qcom,pmi8950-pwm" , .data = &pmi8950_pwm_data },
{ .compatible = "qcom,pmi8994-lpg" , .data = &pmi8994_lpg_data },
{ .compatible = "qcom,pmi8998-lpg" , .data = &pmi8998_lpg_data },
{ .compatible = "qcom,pmc8180c-lpg" , .data = &pm8150l_lpg_data },
{ .compatible = "qcom,pmk8550-pwm" , .data = &pmk8550_pwm_data },
{}
};
MODULE_DEVICE_TABLE(of, lpg_of_table);
static struct platform_driver lpg_driver = {
.probe = lpg_probe,
.driver = {
.name = "qcom-spmi-lpg" ,
.of_match_table = lpg_of_table,
},
};
module_platform_driver(lpg_driver);
MODULE_DESCRIPTION("Qualcomm LPG LED driver" );
MODULE_LICENSE("GPL v2" );
Messung V0.5 in Prozent C=94 H=92 G=92
¤ Dauer der Verarbeitung: 0.37 Sekunden
(vorverarbeitet am 2026-10-11)
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