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Message-ID: <11966469.O9o76ZdvQC@g550jk>
Date: Thu, 28 Apr 2022 19:23:33 +0200
From: Luca Weiss <luca@...tu.xyz>
To: Pavel Machek <pavel@....cz>,
Thierry Reding <thierry.reding@...il.com>,
Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>, Lee Jones <lee.jones@...aro.org>,
Doug Anderson <dianders@...omium.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>, Jonathan Corbet <corbet@....net>,
linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
linux-pwm@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v14 2/2] leds: Add driver for Qualcomm LPG
Hi Bjorn,
On Donnerstag, 3. März 2022 22:43:00 CEST 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@...aro.org>
Works fine on qcom-msm8974-fairphone-fp2 which uses the pm8941 PMIC.
Thanks a lot!
Tested-by: Luca Weiss <luca@...tu.xyz>
Regards
Luca
> ---
>
> 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
> - 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");
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