On 2022-03-03 13:43:00, Bjorn Andersson wrote: > The Light Pulse Generator (LPG) is a PWM-block found in a wide range of > PMICs from Qualcomm. These PMICs typically comes with 1-8 LPG instances, > with their output being routed to various other components, such as > current sinks or GPIOs. > > Each LPG instance can operate on fixed parameters or based on a shared > lookup-table, altering the duty cycle over time. This provides the means > for hardware assisted transitions of LED brightness. > > A typical use case for the fixed parameter mode is to drive a PWM > backlight control signal, the driver therefor allows each LPG instance > to be exposed to the kernel either through the LED framework or the PWM > framework. > > A typical use case for the LED configuration is to drive RGB LEDs in > smartphones etc, for which the driver supports multiple channels to be > ganged up to a MULTICOLOR LED. In this configuration the pattern > generators will be synchronized, to allow for multi-color patterns. > > The idea of modelling this as a LED driver ontop of a PWM driver was > considered, but setting the properties related to patterns does not fit > in the PWM API. Similarly the idea of just duplicating the lower bits in > a PWM and LED driver separately was considered, but this would not allow > the PWM channels and LEDs to be configured on a per-board basis. The > driver implements the more complex LED interface, and provides a PWM > interface on the side of that, in the same driver. > > Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx> > --- > > Changes since v13: > - Fixed mixed space/tab indentation in documentation > - Added 0 as to lpg_clk_rates[] to match the hardware state, to avoid + 1 in > lpg_apply_freq() and - 1 in lpg_pwm_get_state() > - Don't divide with 0 if current clock is 0 in lpg_pwm_get_state(), just return > period = duty = 0 in this case > - Renamed "clk" in struct lpg_channel to clk_sel > - Renamed "pre_div" in struct lpg_channel to pre_div_sel > > Changes since v12: > - Initialize ret in lpg_pwm_apply() > > Changes since v11: > - Extended commit message to cover decision to put pwm_chip in the LED driver > - Added Documentation, in particular for the hw_pattern format > - Added a lock to synchronize requests from LED and PWM frameworks > - Turned out that the 9bit selector differs per channel in some PMICs, so > replaced bitmask in lpg_data with lookup based on QPNP SUBTYPE Thanks a lot for picking up this suggestion [1] going all the way back to v6! Turns out indeed that `3 << 4` (= GENMASK(5, 4)) is simply yet another LPG subtype that we can cleanly query from the hardware :). I wonder if we're ever going to run into hardware with multiple subtypes for different channels... [1]: https://lore.kernel.org/linux-arm-msm/881fb5a3-fb51-3967-63de-a09950839855@xxxxxxxxxxxxxx/ > - Fixed kerneldoc for the struct device pointer in struct lpg > - Rewrote conditional in lut_free() to make it easier to read > - Corrected and deduplicated max_period expression in lpg_calc_freq() > - Extended nom/dom to numerator/denominator in lpg_calc_freq() > - Replaced 1 << 9 with LPG_RESOLUTION in one more place in lpg_calc_freq() > - Use FIELD_PREP() in lpg_apply_freq() as masks was introduced for reading the > same in get_state() > - Cleaned up the pattern format, to allow specifying both low and high pause > with and without pingpong mode. > - Only update frequency and pwm_value if PWM channel is enabled in lpg_pwm_apply > - Make lpg_pwm_get_state() read the hardware state, in order to pick up e.g. > bootloader backlight configuration > - Use devm_bitmap_zalloc() to allocate the lut_bitmap > - Use dev_err_probe() in lpg_probe() > - Extended Kconfig help text to mention module name and satisfy checkpatch > > Documentation/leds/leds-qcom-lpg.rst | 76 ++ > drivers/leds/Kconfig | 3 + > drivers/leds/Makefile | 3 + > drivers/leds/rgb/Kconfig | 18 + > drivers/leds/rgb/Makefile | 3 + > drivers/leds/rgb/leds-qcom-lpg.c | 1405 ++++++++++++++++++++++++++ > 6 files changed, 1508 insertions(+) > create mode 100644 Documentation/leds/leds-qcom-lpg.rst > create mode 100644 drivers/leds/rgb/Kconfig > create mode 100644 drivers/leds/rgb/Makefile > create mode 100644 drivers/leds/rgb/leds-qcom-lpg.c > > diff --git a/Documentation/leds/leds-qcom-lpg.rst b/Documentation/leds/leds-qcom-lpg.rst > new file mode 100644 > index 000000000000..f12416f02dd8 > --- /dev/null > +++ b/Documentation/leds/leds-qcom-lpg.rst > @@ -0,0 +1,76 @@ > +.. SPDX-License-Identifier: GPL-2.0 > + > +============================== > +Kernel driver for Qualcomm LPG > +============================== > + > +Description > +----------- > + > +The Qualcomm LPG can be found in a variety of Qualcomm PMICs and consists of a > +number of PWM channels, a programmable pattern lookup table and a RGB LED > +current sink. > + > +To facilitate the various use cases, the LPG channels can be exposed as > +individual LEDs, grouped together as RGB LEDs or otherwise be accessed as PWM > +channels. The output of each PWM channel is routed to other hardware > +blocks, such as the RGB current sink, GPIO pins etc. > + > +The each PWM channel can operate with a period between 27us and 384 seconds and > +has a 9 bit resolution of the duty cycle. > + > +In order to provide support for status notifications with the CPU subsystem in > +deeper idle states the LPG provides pattern support. This consists of a shared > +lookup table of brightness values and per channel properties to select the > +range within the table to use, the rate and if the pattern should repeat. > + > +The pattern for a channel can be programmed using the "pattern" trigger, using > +the hw_pattern attribute. > + > +/sys/class/leds/<led>/hw_pattern > +-------------------------------- > + > +Specify a hardware pattern for a Qualcomm LPG LED. > + > +The pattern is a series of brightness and hold-time pairs, with the hold-time > +expressed in milliseconds. The hold time is a property of the pattern and must > +therefor be identical for each element in the pattern (except for the pauses > +described below). > + > +Simple pattern:: > + > + "255 500 0 500" > + > + ^ > + | > + 255 +----+ +----+ > + | | | | ... > + 0 | +----+ +---- > + +----------------------> > + 0 5 10 15 time (100ms) > + > +The LPG supports specifying a longer hold-time for the first and last element > +in the pattern, the so called "low pause" and "high pause". > + > +Low-pause pattern:: > + > + "255 1000 0 500 255 500 0 500" > + > + ^ > + | > + 255 +--------+ +----+ +----+ +--------+ > + | | | | | | | | ... > + 0 | +----+ +----+ +----+ +---- > + +-----------------------------> > + 0 5 10 15 20 25 time (100ms) > + > +Similarily, the last entry can be stretched by using a higher hold-time on the > +last entry. > + > +In order to save space in the shared lookup table the LPG supports "ping-pong" > +mode, in which case each run through the pattern is performed by first running > +the pattern forward, then backwards. This mode is automatically used by the > +driver when the given pattern is a palindrome. In this case the "high pause" > +denotes the wait time before the pattern is run in reverse and as such the > +specified hold-time of the middle item in the pattern is allowed to have a > +different hold-time. > diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig > index 6090e647daee..a49979f41eee 100644 > --- a/drivers/leds/Kconfig > +++ b/drivers/leds/Kconfig > @@ -869,6 +869,9 @@ source "drivers/leds/blink/Kconfig" > comment "Flash and Torch LED drivers" > source "drivers/leds/flash/Kconfig" > > +comment "RGB LED drivers" > +source "drivers/leds/rgb/Kconfig" > + > comment "LED Triggers" > source "drivers/leds/trigger/Kconfig" > > diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile > index e58ecb36360f..4fd2f92cd198 100644 > --- a/drivers/leds/Makefile > +++ b/drivers/leds/Makefile > @@ -99,6 +99,9 @@ obj-$(CONFIG_LEDS_USER) += uleds.o > # Flash and Torch LED Drivers > obj-$(CONFIG_LEDS_CLASS_FLASH) += flash/ > > +# RGB LED Drivers > +obj-$(CONFIG_LEDS_CLASS_MULTICOLOR) += rgb/ > + > # LED Triggers > obj-$(CONFIG_LEDS_TRIGGERS) += trigger/ > > diff --git a/drivers/leds/rgb/Kconfig b/drivers/leds/rgb/Kconfig > new file mode 100644 > index 000000000000..5dd27ad80856 > --- /dev/null > +++ b/drivers/leds/rgb/Kconfig > @@ -0,0 +1,18 @@ > +# SPDX-License-Identifier: GPL-2.0 > + > +if LEDS_CLASS_MULTICOLOR > + > +config LEDS_QCOM_LPG > + tristate "LED support for Qualcomm LPG" > + depends on OF > + depends on SPMI > + help > + This option enables support for the Light Pulse Generator found in a > + wide variety of Qualcomm PMICs. The LPG consists of a number of PWM > + channels and typically a shared pattern lookup table and a current > + sink, intended to drive RGB LEDs. Each channel can either be used as > + a LED, grouped to represent a RGB LED or exposed as PWM channels. > + > + If compiled as a module, the module will be named leds-qcom-lpg. > + > +endif # LEDS_CLASS_MULTICOLOR > diff --git a/drivers/leds/rgb/Makefile b/drivers/leds/rgb/Makefile > new file mode 100644 > index 000000000000..83114f44c4ea > --- /dev/null > +++ b/drivers/leds/rgb/Makefile > @@ -0,0 +1,3 @@ > +# SPDX-License-Identifier: GPL-2.0 > + > +obj-$(CONFIG_LEDS_QCOM_LPG) += leds-qcom-lpg.o > diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c > new file mode 100644 > index 000000000000..17576f77c423 > --- /dev/null > +++ b/drivers/leds/rgb/leds-qcom-lpg.c > @@ -0,0 +1,1405 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright (c) 2017-2022 Linaro Ltd > + * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved. > + */ > +#include <linux/bits.h> > +#include <linux/bitfield.h> > +#include <linux/led-class-multicolor.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/of_device.h> > +#include <linux/platform_device.h> > +#include <linux/pwm.h> > +#include <linux/regmap.h> > +#include <linux/slab.h> > + > +#define LPG_SUBTYPE_REG 0x05 > +#define LPG_SUBTYPE_LPG 0x2 > +#define LPG_SUBTYPE_PWM 0xb > +#define LPG_SUBTYPE_LPG_LITE 0x11 > +#define LPG_PATTERN_CONFIG_REG 0x40 > +#define LPG_SIZE_CLK_REG 0x41 > +#define PWM_CLK_SELECT_MASK GENMASK(1, 0) > +#define LPG_PREDIV_CLK_REG 0x42 > +#define PWM_FREQ_PRE_DIV_MASK GENMASK(6, 5) > +#define PWM_FREQ_EXP_MASK GENMASK(2, 0) > +#define PWM_TYPE_CONFIG_REG 0x43 > +#define PWM_VALUE_REG 0x44 > +#define PWM_ENABLE_CONTROL_REG 0x46 > +#define PWM_SYNC_REG 0x47 > +#define LPG_RAMP_DURATION_REG 0x50 > +#define LPG_HI_PAUSE_REG 0x52 > +#define LPG_LO_PAUSE_REG 0x54 > +#define LPG_HI_IDX_REG 0x56 > +#define LPG_LO_IDX_REG 0x57 > +#define PWM_SEC_ACCESS_REG 0xd0 > +#define PWM_DTEST_REG(x) (0xe2 + (x) - 1) > + > +#define TRI_LED_SRC_SEL 0x45 > +#define TRI_LED_EN_CTL 0x46 > +#define TRI_LED_ATC_CTL 0x47 > + > +#define LPG_LUT_REG(x) (0x40 + (x) * 2) > +#define RAMP_CONTROL_REG 0xc8 > + > +#define LPG_RESOLUTION 512 > +#define LPG_MAX_M 7 > + > +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 > + * @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; > + > + 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 > + * @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 > + * @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; > + > + 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; > + > + 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[]; > +}; > + > +/** > + * struct lpg_channel_data - per channel initialization data > + * @base: base address for PWM channel registers > + * @triled_mask: bitmask for controlling this channel in TRILED > + */ > +struct lpg_channel_data { > + 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; > +}; > + > +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(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) > +{ > + 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_pre_divs[] = {1, 3, 5, 6}; > + > +static int lpg_calc_freq(struct lpg_channel *chan, uint64_t period) > +{ > + unsigned int clk_sel, best_clk = 0; > + unsigned int div, best_div = 0; > + unsigned int m, best_m = 0; > + unsigned int error; > + unsigned int best_err = UINT_MAX; > + u64 best_period = 0; > + u64 max_period; > + > + /* > + * The PWM period is determined by: > + * > + * resolution * pre_div * 2^M > + * period = -------------------------- > + * refclk > + * > + * With resolution fixed at 2^9 bits, pre_div = {1, 3, 5, 6} and > + * M = [0..7]. > + * > + * This allows for periods between 27uS and 384s, as the PWM framework > + * wants a period of equal or lower length than requested, reject > + * anything below 27uS. > + */ > + if (period <= (u64)NSEC_PER_SEC * LPG_RESOLUTION / 19200000) > + return -EINVAL; > + > + /* Limit period to largest possible value, to avoid overflows */ > + max_period = (u64)NSEC_PER_SEC * LPG_RESOLUTION * 6 * (1 << LPG_MAX_M) / 1024; > + if (period > max_period) > + period = max_period; > + > + /* > + * Search for the pre_div, refclk and M by solving the rewritten formula > + * for each refclk and pre_div value: > + * > + * period * refclk > + * M = log2 ------------------------------------- > + * NSEC_PER_SEC * pre_div * resolution > + */ > + for (clk_sel = 1; clk_sel < ARRAY_SIZE(lpg_clk_rates); clk_sel++) { > + u64 numerator = period * lpg_clk_rates[clk_sel]; > + > + for (div = 0; div < ARRAY_SIZE(lpg_pre_divs); div++) { > + u64 denominator = (u64)NSEC_PER_SEC * lpg_pre_divs[div] * LPG_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), lpg_clk_rates[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; > + } > + } > + } > + > + chan->clk_sel = best_clk; > + chan->pre_div_sel = best_div; > + chan->pre_div_exp = best_m; > + chan->period = best_period; > + > + return 0; > +} > + > +static void lpg_calc_duty(struct lpg_channel *chan, uint64_t duty) > +{ > + unsigned int max = LPG_RESOLUTION - 1; > + unsigned int val; > + > + val = div64_u64(duty * lpg_clk_rates[chan->clk_sel], > + (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 9bit 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 |= BIT(2); > + 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_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) { > + dev_err(lpg->dev, "qcom,dtest needs to be %d items\n", > + lpg->data->num_channels * 2); > + return -EINVAL; > + } > + > + 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: > + dev_err(lpg->dev, "malformed qcom,dtest\n"); > + return ret; > +} > + > +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, 0xa5); > + 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); > + 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); > + > + 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); > +} > + > +static void 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); > +} > + > +static void 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); > +} > + > +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); > + *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 *pattern, > + u32 len, int repeat) > +{ > + struct lpg_channel *chan; > + struct lpg *lpg = led->lpg; > + unsigned int brightness_a; > + unsigned int brightness_b; > + unsigned int actual_len; > + unsigned int hi_pause; > + unsigned int lo_pause; > + unsigned int delta_t; > + unsigned int lo_idx; > + unsigned int hi_idx; > + unsigned int i; > + bool ping_pong = true; > + int ret; > + > + /* Hardware only support oneshot or indefinite loops */ > + if (repeat != -1 && repeat != 1) > + return -EINVAL; > + > + /* > + * Specifying a pattern of length 1 causes the hardware to iterate > + * through the entire LUT, so prohibit this. > + */ > + if (len < 2) > + return -EINVAL; > + > + /* > + * 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". > + */ > + > + /* Detect palindromes and use "ping pong" to reduce LUT usage */ > + 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; > + } > + } > + > + /* 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) > + return -EINVAL; > + } > + } > + > + /* LPG_RAMP_DURATION_REG is a 9bit */ > + if (delta_t >= BIT(9)) > + return -EINVAL; > + > + /* Find "low pause" and "high pause" in the pattern */ > + lo_pause = pattern[0].delta_t; > + hi_pause = pattern[actual_len - 1].delta_t; > + > + mutex_lock(&lpg->lock); > + ret = lpg_lut_store(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); > + > + 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); > + int ret; > + > + 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]; > + 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 int lpg_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) > +{ > + struct lpg *lpg = container_of(chip, struct lpg, pwm); > + 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 = container_of(chip, struct lpg, pwm); > + 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 void lpg_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, > + struct pwm_state *state) > +{ > + struct lpg *lpg = container_of(chip, struct lpg, pwm); > + struct lpg_channel *chan = &lpg->channels[pwm->hwpwm]; > + 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; > + > + refclk = lpg_clk_rates[val & PWM_CLK_SELECT_MASK]; > + if (refclk) { > + ret = regmap_read(lpg->map, chan->base + LPG_PREDIV_CLK_REG, &val); > + if (ret) > + return; > + > + 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; > + > + state->period = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC * LPG_RESOLUTION * 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; > + > + 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; > +} > + > +static const struct pwm_ops lpg_pwm_ops = { > + .request = lpg_pwm_request, > + .apply = lpg_pwm_apply, > + .get_state = lpg_pwm_get_state, > + .owner = THIS_MODULE, > +}; > + > +static int lpg_add_pwm(struct lpg *lpg) > +{ > + int ret; > + > + lpg->pwm.base = -1; > + lpg->pwm.dev = lpg->dev; > + lpg->pwm.npwm = lpg->num_channels; > + lpg->pwm.ops = &lpg_pwm_ops; > + > + ret = pwmchip_add(&lpg->pwm); > + if (ret) > + dev_err(lpg->dev, "failed to add PWM chip: ret %d\n", ret); > + > + 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) { > + dev_err(lpg->dev, "invalid \"reg\" of %pOFn\n", np); > + return -EINVAL; > + } > + > + chan = &lpg->channels[reg - 1]; > + chan->in_use = true; > + > + ret = of_property_read_u32(np, "color", &color); > + if (ret < 0 && ret != -EINVAL) { > + dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np); > + return ret; > + } > + > + 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 device_node *child; > + 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) { > + dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np); > + return ret; > + } > + > + 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(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 = lpg_brightness_mc_set; > + cdev->blink_set = lpg_blink_mc_set; > + > + /* Register pattern accessors only if we have a LUT block */ > + if (lpg->lut_base) { > + 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 = lpg_brightness_single_set; > + cdev->blink_set = lpg_blink_single_set; > + > + /* Register pattern accessors only if we have a LUT block */ > + if (lpg->lut_base) { > + 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); > + cdev->max_brightness = LPG_RESOLUTION - 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(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(lpg->dev, "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); > + > + 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) { > + dev_err(lpg->dev, "invalid power source\n"); > + return -EINVAL; > + } > + } > + > + /* 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_base) > + return 0; > + > + lpg->lut_base = data->lut_base; > + lpg->lut_size = data->lut_size; > + > + lpg->lut_bitmap = devm_bitmap_zalloc(lpg->dev, lpg->lut_size, GFP_KERNEL); > + if (!lpg->lut_bitmap) > + return -ENOMEM; > + > + return 0; > +} > + > +static int lpg_probe(struct platform_device *pdev) > +{ > + struct device_node *np; > + 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; > + > + platform_set_drvdata(pdev, lpg); > + > + 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_lut(lpg); > + if (ret < 0) > + return ret; > + > + for_each_available_child_of_node(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 int lpg_remove(struct platform_device *pdev) > +{ > + struct lpg *lpg = platform_get_drvdata(pdev); > + > + pwmchip_remove(&lpg->pwm); > + > + return 0; > +} > + > +static const struct lpg_data pm8916_pwm_data = { > + .num_channels = 1, > + .channels = (const struct lpg_channel_data[]) { > + { .base = 0xbc00 }, > + }, > +}; > + > +static const struct lpg_data pm8941_lpg_data = { > + .lut_base = 0xb000, > + .lut_size = 64, > + > + .triled_base = 0xd000, > + .triled_has_atc_ctl = true, > + .triled_has_src_sel = true, > + > + .num_channels = 8, > + .channels = (const struct lpg_channel_data[]) { > + { .base = 0xb100 }, > + { .base = 0xb200 }, > + { .base = 0xb300 }, > + { .base = 0xb400 }, > + { .base = 0xb500, .triled_mask = BIT(5) }, > + { .base = 0xb600, .triled_mask = BIT(6) }, > + { .base = 0xb700, .triled_mask = BIT(7) }, > + { .base = 0xb800 }, > + }, > +}; > + > +static const struct lpg_data pm8994_lpg_data = { > + .lut_base = 0xb000, > + .lut_size = 64, > + > + .num_channels = 6, > + .channels = (const struct lpg_channel_data[]) { > + { .base = 0xb100 }, > + { .base = 0xb200 }, > + { .base = 0xb300 }, > + { .base = 0xb400 }, > + { .base = 0xb500 }, > + { .base = 0xb600 }, > + }, > +}; > + > +static const struct lpg_data pmi8994_lpg_data = { > + .lut_base = 0xb000, > + .lut_size = 24, > + > + .triled_base = 0xd000, > + .triled_has_atc_ctl = true, > + .triled_has_src_sel = true, > + > + .num_channels = 4, > + .channels = (const struct lpg_channel_data[]) { > + { .base = 0xb100, .triled_mask = BIT(5) }, > + { .base = 0xb200, .triled_mask = BIT(6) }, > + { .base = 0xb300, .triled_mask = BIT(7) }, > + { .base = 0xb400 }, > + }, > +}; > + > +static const struct lpg_data pmi8998_lpg_data = { > + .lut_base = 0xb000, > + .lut_size = 49, > + > + .triled_base = 0xd000, > + > + .num_channels = 6, > + .channels = (const struct lpg_channel_data[]) { > + { .base = 0xb100 }, > + { .base = 0xb200 }, > + { .base = 0xb300, .triled_mask = BIT(5) }, > + { .base = 0xb400, .triled_mask = BIT(6) }, > + { .base = 0xb500, .triled_mask = BIT(7) }, > + { .base = 0xb600 }, > + }, > +}; > + > +static const struct lpg_data pm8150b_lpg_data = { > + .lut_base = 0xb000, > + .lut_size = 24, > + > + .triled_base = 0xd000, > + > + .num_channels = 2, > + .channels = (const struct lpg_channel_data[]) { > + { .base = 0xb100, .triled_mask = BIT(7) }, > + { .base = 0xb200, .triled_mask = BIT(6) }, > + }, > +}; > + > +static const struct lpg_data pm8150l_lpg_data = { > + .lut_base = 0xb000, > + .lut_size = 48, > + > + .triled_base = 0xd000, > + > + .num_channels = 5, > + .channels = (const struct lpg_channel_data[]) { > + { .base = 0xb100, .triled_mask = BIT(7) }, > + { .base = 0xb200, .triled_mask = BIT(6) }, > + { .base = 0xb300, .triled_mask = BIT(5) }, > + { .base = 0xbc00 }, > + { .base = 0xbd00 }, > + > + }, > +}; > + > +static const struct of_device_id lpg_of_table[] = { > + { .compatible = "qcom,pm8150b-lpg", .data = &pm8150b_lpg_data }, > + { .compatible = "qcom,pm8150l-lpg", .data = &pm8150l_lpg_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,pmi8994-lpg", .data = &pmi8994_lpg_data }, > + { .compatible = "qcom,pmi8998-lpg", .data = &pmi8998_lpg_data }, > + { .compatible = "qcom,pmc8180c-lpg", .data = &pm8150l_lpg_data }, > + {} > +}; > +MODULE_DEVICE_TABLE(of, lpg_of_table); > + > +static struct platform_driver lpg_driver = { > + .probe = lpg_probe, > + .remove = lpg_remove, > + .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"); > -- > 2.33.1 >
