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Subject[PATCH 1/2] leds: Add driver for Qualcomm LPG
Date
The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
PMICs from Qualcomm. It can operate on fixed parameters or based on a
lookup-table, altering the duty cycle over time - which provides the
means for e.g. hardware assisted transitions of LED brightness.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
.../ABI/testing/sysfs-class-led-driver-qcom-lpg | 47 ++
drivers/leds/Kconfig | 7 +
drivers/leds/Makefile | 3 +
drivers/leds/leds-qcom-lpg-lut.c | 299 ++++++++
drivers/leds/leds-qcom-lpg.c | 779 +++++++++++++++++++++
drivers/leds/leds-qcom-lpg.h | 30 +
drivers/leds/leds-qcom-triled.c | 193 +++++
7 files changed, 1358 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-class-led-driver-qcom-lpg
create mode 100644 drivers/leds/leds-qcom-lpg-lut.c
create mode 100644 drivers/leds/leds-qcom-lpg.c
create mode 100644 drivers/leds/leds-qcom-lpg.h
create mode 100644 drivers/leds/leds-qcom-triled.c

diff --git a/Documentation/ABI/testing/sysfs-class-led-driver-qcom-lpg b/Documentation/ABI/testing/sysfs-class-led-driver-qcom-lpg
new file mode 100644
index 000000000000..35bfe6e8e148
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-led-driver-qcom-lpg
@@ -0,0 +1,47 @@
+What: /sys/class/leds/<led>/duration
+Date: March 2017
+KernelVersion: 4.12
+Contact: Bjorn Andersson <bjorn.andersson@linaro.org>
+Description:
+ Duration of one cycle through the pattern in the ramp
+ generator.
+
+What: /sys/class/leds/<led>/oneshot
+Date: March 2017
+KernelVersion: 4.12
+Contact: Bjorn Andersson <bjorn.andersson@linaro.org>
+Description:
+ Stop the ramp generator after a single pass.
+
+What: /sys/class/leds/<led>/pattern
+Date: March 2017
+KernelVersion: 4.12
+Contact: Bjorn Andersson <bjorn.andersson@linaro.org>
+Description:
+ Comma-separated list of duty cycle values to output from
+ the ramp generator. Values should be in the range of 0
+ to 511.
+
+What: /sys/class/leds/<led>/pause_lo
+What: /sys/class/leds/<led>/pause_hi
+Date: March 2017
+KernelVersion: 4.12
+Contact: Bjorn Andersson <bjorn.andersson@linaro.org>
+Description:
+ Pause time, in milliseconds, before and after one run
+ over the pattern.
+
+What: /sys/class/leds/<led>/ping_pong
+Date: March 2017
+KernelVersion: 4.12
+Contact: Bjorn Andersson <bjorn.andersson@linaro.org>
+Description:
+ Reverse direction when the ramp generator reaches the
+ end of the pattern, rather than wrapping to the start.
+
+What: /sys/class/leds/<led>/reverse
+Date: March 2017
+KernelVersion: 4.12
+Contact: Bjorn Andersson <bjorn.andersson@linaro.org>
+Description:
+ Run the ramp generator backwards over the pattern.
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 275f467956ee..4b08d9802d5b 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -634,6 +634,13 @@ config LEDS_POWERNV
To compile this driver as a module, choose 'm' here: the module
will be called leds-powernv.

+config LEDS_QCOM_LPG
+ tristate "LED support for Qualcomm LPG"
+ depends on LEDS_CLASS
+ help
+ This option enables support for the Light Pulse Generator found in a
+ wide variety of Qualcomm PMICs.
+
config LEDS_SYSCON
bool "LED support for LEDs on system controllers"
depends on LEDS_CLASS=y
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 6b8273736478..6390c1a36b13 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -61,6 +61,9 @@ obj-$(CONFIG_LEDS_MAX77693) += leds-max77693.o
obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o
obj-$(CONFIG_LEDS_LM355x) += leds-lm355x.o
obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o
+obj-$(CONFIG_LEDS_QCOM_LPG) += leds-qcom-lpg.o
+obj-$(CONFIG_LEDS_QCOM_LPG) += leds-qcom-lpg-lut.o
+obj-$(CONFIG_LEDS_QCOM_LPG) += leds-qcom-triled.o
obj-$(CONFIG_LEDS_SYSCON) += leds-syscon.o
obj-$(CONFIG_LEDS_VERSATILE) += leds-versatile.o
obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o
diff --git a/drivers/leds/leds-qcom-lpg-lut.c b/drivers/leds/leds-qcom-lpg-lut.c
new file mode 100644
index 000000000000..020f9cefda23
--- /dev/null
+++ b/drivers/leds/leds-qcom-lpg-lut.c
@@ -0,0 +1,299 @@
+/* Copyright (c) 2017 Linaro Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "leds-qcom-lpg.h"
+
+#define LPG_LUT_REG(x) (0x40 + (x) * 2)
+#define RAMP_CONTROL_REG 0xc8
+
+static struct platform_driver lpg_lut_driver;
+
+/*
+ * lpg_lut_dev - LUT device context
+ * @dev: struct device for the LUT device
+ * @map: regmap for register access
+ * @reg: base address for the LUT block
+ * @size: number of LUT entries in LUT block
+ * @bitmap: bitmap tracking occupied LUT entries
+ */
+struct lpg_lut_dev {
+ struct device *dev;
+ struct regmap *map;
+
+ u32 reg;
+ u32 size;
+
+ unsigned long bitmap[];
+};
+
+/*
+ * qcom_lpg_lut - context for a client and LUT device pair
+ * @ldev: reference to a LUT device
+ * @start_mask: mask of bits to use for synchronizing ramp generators
+ */
+struct qcom_lpg_lut {
+ struct lpg_lut_dev *ldev;
+ int start_mask;
+};
+
+static void lpg_lut_release(struct device *dev, void *res)
+{
+ struct qcom_lpg_lut *lut = res;
+
+ put_device(lut->ldev->dev);
+}
+
+/**
+ * qcom_lpg_lut_get() - acquire a handle to the LUT implementation
+ * @dev: struct device reference of the client
+ *
+ * Returns a LUT context, or ERR_PTR on failure.
+ */
+struct qcom_lpg_lut *qcom_lpg_lut_get(struct device *dev)
+{
+ struct platform_device *pdev;
+ struct device_node *lut_node;
+ struct qcom_lpg_lut *lut;
+ u32 cell;
+ int ret;
+
+ lut_node = of_parse_phandle(dev->of_node, "qcom,lut", 0);
+ if (!lut_node)
+ return NULL;
+
+ ret = of_property_read_u32(dev->of_node, "cell-index", &cell);
+ if (ret) {
+ dev_err(dev, "lpg without cell-index\n");
+ return ERR_PTR(ret);
+ }
+
+ pdev = of_find_device_by_node(lut_node);
+ of_node_put(lut_node);
+ if (!pdev || !pdev->dev.driver)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ if (pdev->dev.driver != &lpg_lut_driver.driver) {
+ dev_err(dev, "referenced node is not a lpg lut\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ lut = devres_alloc(lpg_lut_release, sizeof(*lut), GFP_KERNEL);
+ if (!lut)
+ return ERR_PTR(-ENOMEM);
+
+ lut->ldev = platform_get_drvdata(pdev);
+ lut->start_mask = BIT(cell - 1);
+
+ devres_add(dev, lut);
+
+ return lut;
+}
+EXPORT_SYMBOL_GPL(qcom_lpg_lut_get);
+
+/**
+ * qcom_lpg_lut_store() - store a sequence of levels in the LUT
+ * @lut: LUT context acquired from qcom_lpg_lut_get()
+ * @values: an array of values, in the range 0 <= x < 512
+ * @len: length of the @values array
+ *
+ * Returns a qcom_lpg_pattern object, or ERR_PTR on failure.
+ *
+ * Patterns must be freed by calling qcom_lpg_lut_free()
+ */
+struct qcom_lpg_pattern *qcom_lpg_lut_store(struct qcom_lpg_lut *lut,
+ const u16 *values, size_t len)
+{
+ struct qcom_lpg_pattern *pattern;
+ struct lpg_lut_dev *ldev = lut->ldev;
+ unsigned long lo_idx;
+ u8 val[2];
+ int i;
+
+ /* Hardware does not behave when LO_IDX == HI_IDX */
+ if (len == 1)
+ return ERR_PTR(-EINVAL);
+
+ lo_idx = bitmap_find_next_zero_area(ldev->bitmap, ldev->size, 0, len, 0);
+ if (lo_idx >= ldev->size)
+ return ERR_PTR(-ENOMEM);
+
+ pattern = kzalloc(sizeof(*pattern), GFP_KERNEL);
+ if (!pattern)
+ return ERR_PTR(-ENOMEM);
+
+ pattern->lut = lut;
+ pattern->lo_idx = lo_idx;
+ pattern->hi_idx = lo_idx + len - 1;
+
+ for (i = 0; i < len; i++) {
+ val[0] = values[i] & 0xff;
+ val[1] = values[i] >> 8;
+
+ regmap_bulk_write(ldev->map,
+ ldev->reg + LPG_LUT_REG(lo_idx + i), val, 2);
+ }
+
+ bitmap_set(ldev->bitmap, lo_idx, len);
+
+ return pattern;
+}
+EXPORT_SYMBOL_GPL(qcom_lpg_lut_store);
+
+ssize_t qcom_lpg_lut_show(struct qcom_lpg_pattern *pattern, char *buf)
+{
+ struct qcom_lpg_lut *lut;
+ struct lpg_lut_dev *ldev;
+ unsigned long lo_idx;
+ char chunk[6]; /* 3 digits, a comma, a space and NUL */
+ char *bp = buf;
+ int len;
+ u8 val[2];
+ int ret;
+ int i;
+ int n;
+
+ if (!pattern)
+ return 0;
+
+ lut = pattern->lut;
+ ldev = lut->ldev;
+ lo_idx = pattern->lo_idx;
+
+ len = pattern->hi_idx - pattern->lo_idx + 1;
+ for (i = 0; i < len; i++) {
+ ret = regmap_bulk_read(ldev->map,
+ ldev->reg + LPG_LUT_REG(lo_idx + i),
+ &val, 2);
+ if (ret)
+ return ret;
+
+ n = snprintf(chunk, sizeof(chunk), "%d", val[0] | val[1] << 8);
+
+ /* ensure we have space for value, comma and NUL */
+ if (bp + n + 2 >= buf + PAGE_SIZE)
+ return -E2BIG;
+
+ memcpy(bp, chunk, n);
+ bp += n;
+
+ if (i < len - 1)
+ *bp++ = ',';
+ else
+ *bp++ = '\n';
+ }
+
+ *bp = '\0';
+
+ return bp - buf;
+}
+EXPORT_SYMBOL_GPL(qcom_lpg_lut_show);
+
+/**
+ * qcom_lpg_lut_free() - release LUT pattern and free entries
+ * @pattern: reference to pattern to release
+ */
+void qcom_lpg_lut_free(struct qcom_lpg_pattern *pattern)
+{
+ struct qcom_lpg_lut *lut;
+ struct lpg_lut_dev *ldev;
+ int len;
+
+ if (!pattern)
+ return;
+
+ lut = pattern->lut;
+ ldev = lut->ldev;
+
+ len = pattern->hi_idx - pattern->lo_idx + 1;
+ bitmap_clear(ldev->bitmap, pattern->lo_idx, len);
+}
+EXPORT_SYMBOL_GPL(qcom_lpg_lut_free);
+
+/**
+ * qcom_lpg_lut_sync() - (re)start the ramp generator, to sync pattern
+ * @lut: LUT device reference, to sync
+ */
+int qcom_lpg_lut_sync(struct qcom_lpg_lut *lut)
+{
+ struct lpg_lut_dev *ldev = lut->ldev;
+
+ return regmap_update_bits(ldev->map, ldev->reg + RAMP_CONTROL_REG,
+ lut->start_mask, 0xff);
+}
+EXPORT_SYMBOL_GPL(qcom_lpg_lut_sync);
+
+static int lpg_lut_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct lpg_lut_dev *ldev;
+ size_t bitmap_size;
+ u32 size;
+ int ret;
+
+ ret = of_property_read_u32(np, "qcom,lut-size", &size);
+ if (ret) {
+ dev_err(&pdev->dev, "invalid LUT size\n");
+ return -EINVAL;
+ }
+
+ bitmap_size = BITS_TO_LONGS(size) / sizeof(unsigned long);
+ ldev = devm_kzalloc(&pdev->dev, sizeof(*ldev) + bitmap_size, GFP_KERNEL);
+ if (!ldev)
+ return -ENOMEM;
+
+ ldev->dev = &pdev->dev;
+ ldev->size = size;
+
+ ldev->map = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!ldev->map) {
+ dev_err(&pdev->dev, "parent regmap unavailable\n");
+ return -ENXIO;
+ }
+
+ ret = of_property_read_u32(np, "reg", &ldev->reg);
+ if (ret) {
+ dev_err(&pdev->dev, "no register offset specified\n");
+ return -EINVAL;
+ }
+
+ platform_set_drvdata(pdev, ldev);
+
+ return 0;
+}
+
+static const struct of_device_id lpg_lut_of_table[] = {
+ { .compatible = "qcom,spmi-lpg-lut" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, lpg_lut_of_table);
+
+static struct platform_driver lpg_lut_driver = {
+ .probe = lpg_lut_probe,
+ .driver = {
+ .name = "qcom_lpg_lut",
+ .of_match_table = lpg_lut_of_table,
+ },
+};
+module_platform_driver(lpg_lut_driver);
+
+MODULE_DESCRIPTION("Qualcomm TRI LED driver");
+MODULE_LICENSE("GPL v2");
+
diff --git a/drivers/leds/leds-qcom-lpg.c b/drivers/leds/leds-qcom-lpg.c
new file mode 100644
index 000000000000..b60a446c5e8b
--- /dev/null
+++ b/drivers/leds/leds-qcom-lpg.c
@@ -0,0 +1,779 @@
+/*
+ * Copyright (c) 2017 Linaro Ltd
+ * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "leds-qcom-lpg.h"
+
+#define LPG_PATTERN_CONFIG_REG 0x40
+#define LPG_SIZE_CLK_REG 0x41
+#define LPG_PREDIV_CLK_REG 0x42
+#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)
+
+/*
+ * lpg - LPG device context
+ * @dev: struct device for LPG device
+ * @map: regmap for register access
+ * @reg: base address of the LPG device
+ * @dtest_line: DTEST line for output, or 0 if disabled
+ * @dtest_value: DTEST line configuration
+ * @is_lpg: operating as LPG, in contrast to simple PWM
+ * @cdev: LED class object
+ * @tri_led: reference to TRILED color object, optional
+ * @chip: PWM-chip object, if operating in PWM mode
+ * @period_us: period (in microseconds) of the generated pulses
+ * @pwm_value: duty (in microseconds) of the generated pulses, overriden by LUT
+ * @enabled: output enabled?
+ * @pwm_size: resolution of the @pwm_value, 6 or 9 bits
+ * @clk: base frequency of the clock generator
+ * @pre_div: divider of @clk
+ * @pre_div_exp: exponential divider of @clk
+ * @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_duration_ms: length (in milliseconds) of one pattern run
+ * @ramp_lo_pause_ms: pause (in milliseconds) before iterating over pattern
+ * @ramp_hi_pause_ms: pause (in milliseconds) after iterating over pattern
+ * @lut: LUT context reference
+ * @pattern: reference to allocated pattern with LUT
+ */
+
+struct lpg {
+ struct device *dev;
+ struct regmap *map;
+
+ u32 reg;
+ int dtest_line;
+ int dtest_value;
+
+ bool is_lpg;
+
+ struct led_classdev cdev;
+
+ struct qcom_tri_led *tri_led;
+
+ struct pwm_chip chip;
+
+ unsigned int period_us;
+
+ u16 pwm_value;
+ bool enabled;
+
+ unsigned int pwm_size;
+ unsigned int clk;
+ unsigned int pre_div;
+ unsigned int pre_div_exp;
+
+ bool ramp_enabled;
+ bool ramp_ping_pong;
+ bool ramp_oneshot;
+ bool ramp_reverse;
+ unsigned long ramp_duration_ms;
+ unsigned long ramp_lo_pause_ms;
+ unsigned long ramp_hi_pause_ms;
+
+ struct qcom_lpg_lut *lut;
+ struct qcom_lpg_pattern *pattern;
+};
+
+#define NUM_PWM_PREDIV 4
+#define NUM_PWM_CLK 3
+#define NUM_EXP 7
+
+static const unsigned int lpg_clk_table[NUM_PWM_PREDIV][NUM_PWM_CLK] = {
+ {
+ 1 * (NSEC_PER_SEC / 1024),
+ 1 * (NSEC_PER_SEC / 32768),
+ 1 * (NSEC_PER_SEC / 19200000),
+ },
+ {
+ 3 * (NSEC_PER_SEC / 1024),
+ 3 * (NSEC_PER_SEC / 32768),
+ 3 * (NSEC_PER_SEC / 19200000),
+ },
+ {
+ 5 * (NSEC_PER_SEC / 1024),
+ 5 * (NSEC_PER_SEC / 32768),
+ 5 * (NSEC_PER_SEC / 19200000),
+ },
+ {
+ 6 * (NSEC_PER_SEC / 1024),
+ 6 * (NSEC_PER_SEC / 32768),
+ 6 * (NSEC_PER_SEC / 19200000),
+ },
+};
+
+/*
+ * PWM Frequency = Clock Frequency / (N * T)
+ * or
+ * PWM Period = Clock Period * (N * T)
+ * where
+ * N = 2^9 or 2^6 for 9-bit or 6-bit PWM size
+ * T = Pre-divide * 2^m, where m = 0..7 (exponent)
+ *
+ * This is the formula to figure out m for the best pre-divide and clock:
+ * (PWM Period / N) = (Pre-divide * Clock Period) * 2^m
+ */
+static void lpg_calc_freq(struct lpg *lpg, unsigned int period_us)
+{
+ int n, m, clk, div;
+ int best_m, best_div, best_clk;
+ unsigned int last_err, cur_err, min_err;
+ unsigned int tmp_p, period_n;
+
+ if (period_us == lpg->period_us)
+ return;
+
+ /* PWM Period / N */
+ if (period_us < ((unsigned int)(-1) / NSEC_PER_USEC)) {
+ period_n = (period_us * NSEC_PER_USEC) >> 6;
+ n = 6;
+ } else {
+ period_n = (period_us >> 9) * NSEC_PER_USEC;
+ n = 9;
+ }
+
+ min_err = last_err = (unsigned int)(-1);
+ best_m = 0;
+ best_clk = 0;
+ best_div = 0;
+ for (clk = 0; clk < NUM_PWM_CLK; clk++) {
+ for (div = 0; div < NUM_PWM_PREDIV; div++) {
+ /* period_n = (PWM Period / N) */
+ /* tmp_p = (Pre-divide * Clock Period) * 2^m */
+ tmp_p = lpg_clk_table[div][clk];
+ for (m = 0; m <= NUM_EXP; m++) {
+ if (period_n > tmp_p)
+ cur_err = period_n - tmp_p;
+ else
+ cur_err = tmp_p - period_n;
+
+ if (cur_err < min_err) {
+ min_err = cur_err;
+ best_m = m;
+ best_clk = clk;
+ best_div = div;
+ }
+
+ if (m && cur_err > last_err)
+ /* Break for bigger cur_err */
+ break;
+
+ last_err = cur_err;
+ tmp_p <<= 1;
+ }
+ }
+ }
+
+ /* Use higher resolution */
+ if (best_m >= 3 && n == 6) {
+ n += 3;
+ best_m -= 3;
+ }
+
+ lpg->clk = best_clk;
+ lpg->pre_div = best_div;
+ lpg->pre_div_exp = best_m;
+ lpg->pwm_size = n;
+
+ lpg->period_us = period_us;
+}
+
+static void lpg_calc_duty(struct lpg *lpg, unsigned long duty_us)
+{
+ unsigned long max = (1 << lpg->pwm_size) - 1;
+ unsigned long val;
+
+ /* Figure out pwm_value with overflow handling */
+ if (duty_us < 1 << (sizeof(val) * 8 - lpg->pwm_size))
+ val = (duty_us << lpg->pwm_size) / lpg->period_us;
+ else
+ val = duty_us / (lpg->period_us >> lpg->pwm_size);
+
+ if (val > max)
+ val = max;
+
+ lpg->pwm_value = val;
+}
+
+#define LPG_RESOLUTION_9BIT BIT(4)
+
+static void lpg_apply_freq(struct lpg *lpg)
+{
+ unsigned long val;
+
+ if (!lpg->enabled)
+ return;
+
+ /* Clock register values are off-by-one from lpg_clk_table */
+ val = lpg->clk + 1;
+
+ if (lpg->pwm_size == 9)
+ val |= LPG_RESOLUTION_9BIT;
+ regmap_write(lpg->map, lpg->reg + LPG_SIZE_CLK_REG, val);
+
+ val = lpg->pre_div << 5 | lpg->pre_div_exp;
+ regmap_write(lpg->map, lpg->reg + LPG_PREDIV_CLK_REG, val);
+}
+
+#define LPG_ENABLE_GLITCH_REMOVAL BIT(5)
+
+static void lpg_enable_glitch(struct lpg *lpg)
+{
+ regmap_update_bits(lpg->map, lpg->reg + PWM_TYPE_CONFIG_REG,
+ LPG_ENABLE_GLITCH_REMOVAL, 0);
+}
+
+static void lpg_disable_glitch(struct lpg *lpg)
+{
+ regmap_update_bits(lpg->map, lpg->reg + PWM_TYPE_CONFIG_REG,
+ LPG_ENABLE_GLITCH_REMOVAL,
+ LPG_ENABLE_GLITCH_REMOVAL);
+}
+
+static void lpg_apply_pwm_value(struct lpg *lpg)
+{
+ u8 val[] = { lpg->pwm_value & 0xff, lpg->pwm_value >> 8 };
+
+ if (!lpg->enabled)
+ return;
+
+ regmap_bulk_write(lpg->map, lpg->reg + PWM_VALUE_REG, val, 2);
+}
+
+#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 *lpg)
+{
+ struct qcom_lpg_pattern *pattern = lpg->pattern;
+ unsigned int hi_pause;
+ unsigned int lo_pause;
+ unsigned int step;
+ unsigned int conf = 0;
+ int pattern_len;
+
+ if (!lpg->ramp_enabled || !pattern)
+ return;
+
+ pattern_len = pattern->hi_idx - pattern->lo_idx + 1;
+
+ step = DIV_ROUND_UP(lpg->ramp_duration_ms, pattern_len);
+ hi_pause = DIV_ROUND_UP(lpg->ramp_hi_pause_ms, step);
+ lo_pause = DIV_ROUND_UP(lpg->ramp_lo_pause_ms, step);
+
+ if (!lpg->ramp_reverse)
+ conf |= LPG_PATTERN_CONFIG_LO_TO_HI;
+ if (!lpg->ramp_oneshot)
+ conf |= LPG_PATTERN_CONFIG_REPEAT;
+ if (lpg->ramp_ping_pong)
+ conf |= LPG_PATTERN_CONFIG_TOGGLE;
+ if (lpg->ramp_hi_pause_ms)
+ conf |= LPG_PATTERN_CONFIG_PAUSE_HI;
+ if (lpg->ramp_lo_pause_ms)
+ conf |= LPG_PATTERN_CONFIG_PAUSE_LO;
+
+ regmap_write(lpg->map, lpg->reg + LPG_PATTERN_CONFIG_REG, conf);
+ regmap_write(lpg->map, lpg->reg + LPG_HI_IDX_REG, pattern->hi_idx);
+ regmap_write(lpg->map, lpg->reg + LPG_LO_IDX_REG, pattern->lo_idx);
+
+ regmap_write(lpg->map, lpg->reg + LPG_RAMP_DURATION_REG, step);
+ regmap_write(lpg->map, lpg->reg + LPG_HI_PAUSE_REG, hi_pause);
+ regmap_write(lpg->map, lpg->reg + LPG_LO_PAUSE_REG, lo_pause);
+
+ /* Trigger start of ramp generator(s) */
+ qcom_lpg_lut_sync(lpg->lut);
+}
+
+#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 *lpg)
+{
+ unsigned int ctrl;
+
+ ctrl = LPG_ENABLE_CONTROL_BUFFER_TRISTATE;
+
+ if (lpg->enabled)
+ ctrl |= LPG_ENABLE_CONTROL_OUTPUT;
+
+ if (lpg->pattern)
+ ctrl |= LPG_ENABLE_CONTROL_RAMP_GEN;
+ else
+ ctrl |= LPG_ENABLE_CONTROL_SRC_PWM;
+
+ regmap_write(lpg->map, lpg->reg + 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 (lpg->enabled)
+ lpg_apply_pwm_value(lpg);
+}
+
+#define LPG_SYNC_PWM BIT(0)
+
+static void lpg_apply_sync(struct lpg *lpg)
+{
+ regmap_write(lpg->map, lpg->reg + PWM_SYNC_REG, LPG_SYNC_PWM);
+}
+
+static void lpg_apply_dtest(struct lpg *lpg)
+{
+ if (!lpg->dtest_line)
+ return;
+
+ regmap_write(lpg->map, lpg->reg + PWM_SEC_ACCESS_REG, 0xa5);
+ regmap_write(lpg->map, lpg->reg + PWM_DTEST_REG(lpg->dtest_line),
+ lpg->dtest_value);
+}
+
+static void lpg_apply(struct lpg *lpg)
+{
+ lpg_disable_glitch(lpg);
+ lpg_apply_freq(lpg);
+ lpg_apply_pwm_value(lpg);
+ lpg_apply_control(lpg);
+ lpg_apply_sync(lpg);
+ lpg_apply_lut_control(lpg);
+ lpg_enable_glitch(lpg);
+
+ if (lpg->tri_led)
+ qcom_tri_led_set(lpg->tri_led, lpg->enabled);
+}
+
+static void lpg_brightnes_set(struct led_classdev *cdev,
+ enum led_brightness value)
+{
+ struct lpg *lpg = container_of(cdev, struct lpg, cdev);
+ unsigned int duty_us;
+
+ if (value == LED_OFF) {
+ lpg->enabled = false;
+ lpg->ramp_enabled = false;
+ } else if (lpg->pattern) {
+ lpg_calc_freq(lpg, NSEC_PER_USEC);
+
+ lpg->enabled = true;
+ lpg->ramp_enabled = true;
+ } else {
+ lpg_calc_freq(lpg, NSEC_PER_USEC);
+
+ duty_us = value * lpg->period_us / cdev->max_brightness;
+ lpg_calc_duty(lpg, duty_us);
+ lpg->enabled = true;
+ lpg->ramp_enabled = false;
+ }
+
+ lpg_apply(lpg);
+}
+
+static int lpg_blink_set(struct led_classdev *cdev,
+ unsigned long *delay_on, unsigned long *delay_off)
+{
+ struct lpg *lpg = container_of(cdev, struct lpg, cdev);
+ unsigned int period_us;
+ unsigned int duty_us;
+
+ if (!*delay_on && !*delay_off) {
+ *delay_on = 500;
+ *delay_off = 500;
+ }
+
+ duty_us = *delay_on * USEC_PER_MSEC;
+ period_us = (*delay_on + *delay_off) * USEC_PER_MSEC;
+
+ lpg_calc_freq(lpg, period_us);
+ lpg_calc_duty(lpg, duty_us);
+
+ lpg->enabled = true;
+ lpg->ramp_enabled = false;
+
+ lpg_apply(lpg);
+
+ return 0;
+}
+
+static enum led_brightness lpg_brightnes_get(struct led_classdev *cdev)
+{
+ struct lpg *lpg = container_of(cdev, struct lpg, cdev);
+ unsigned long max = (1 << lpg->pwm_size) - 1;
+
+ if (!lpg->enabled)
+ return LED_OFF;
+
+ return lpg->pwm_value * cdev->max_brightness / max;
+}
+
+static int lpg_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+ struct pwm_state *state)
+{
+ struct lpg *lpg = container_of(chip, struct lpg, chip);
+
+ lpg_calc_freq(lpg, state->period / NSEC_PER_USEC);
+ lpg_calc_duty(lpg, state->duty_cycle / NSEC_PER_USEC);
+ lpg->enabled = state->enabled;
+
+ lpg_apply(lpg);
+
+ state->polarity = PWM_POLARITY_NORMAL;
+ state->period = lpg->period_us * NSEC_PER_USEC;
+
+ return 0;
+}
+
+static const struct pwm_ops lpg_pwm_ops = {
+ .apply = lpg_pwm_apply,
+ .owner = THIS_MODULE,
+};
+
+static ssize_t lpg_attr_get(struct device *dev,
+ struct device_attribute *attr,
+ char *buf);
+static ssize_t lpg_attr_set(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count);
+
+static DEVICE_ATTR(ping_pong, 0600, lpg_attr_get, lpg_attr_set);
+static DEVICE_ATTR(oneshot, 0600, lpg_attr_get, lpg_attr_set);
+static DEVICE_ATTR(reverse, 0600, lpg_attr_get, lpg_attr_set);
+static DEVICE_ATTR(pattern, 0600, lpg_attr_get, lpg_attr_set);
+static DEVICE_ATTR(duration, 0600, lpg_attr_get, lpg_attr_set);
+static DEVICE_ATTR(pause_lo, 0600, lpg_attr_get, lpg_attr_set);
+static DEVICE_ATTR(pause_hi, 0600, lpg_attr_get, lpg_attr_set);
+
+static ssize_t lpg_pattern_store(struct lpg *lpg, const char *buf, size_t count)
+{
+ struct qcom_lpg_pattern *new_pattern;
+ unsigned long val;
+ char *sbegin;
+ u16 *pattern;
+ char *elem;
+ char *s;
+ int len = 0;
+ int ret = 0;
+
+ s = sbegin = kstrndup(buf, count, GFP_KERNEL);
+ if (!s)
+ return -ENOMEM;
+
+ pattern = kcalloc(count, sizeof(u16), GFP_KERNEL);
+ if (!pattern) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ if (s[0] == '\0' || (s[0] == '\n' && s[1] == '\0')) {
+ qcom_lpg_lut_free(lpg->pattern);
+ lpg->pattern = NULL;
+ } else {
+ while ((elem = strsep(&s, " ,")) != NULL) {
+ ret = kstrtoul(elem, 10, &val);
+ if (ret)
+ goto out;
+
+ pattern[len++] = val;
+ }
+
+ new_pattern = qcom_lpg_lut_store(lpg->lut, pattern, len);
+ if (IS_ERR(new_pattern)) {
+ ret = PTR_ERR(new_pattern);
+ goto out;
+ }
+
+ qcom_lpg_lut_free(lpg->pattern);
+ lpg->pattern = new_pattern;
+ }
+
+out:
+ kfree(pattern);
+ kfree(sbegin);
+ return ret < 0 ? ret : count;
+}
+
+static ssize_t lpg_attr_get(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct lpg *lpg = dev_get_drvdata(dev);
+
+ if (attr == &dev_attr_ping_pong)
+ return sprintf(buf, "%d\n", lpg->ramp_ping_pong);
+ else if (attr == &dev_attr_oneshot)
+ return sprintf(buf, "%d\n", lpg->ramp_oneshot);
+ else if (attr == &dev_attr_reverse)
+ return sprintf(buf, "%d\n", lpg->ramp_reverse);
+ else if (attr == &dev_attr_duration)
+ return sprintf(buf, "%ld\n", lpg->ramp_duration_ms);
+ else if (attr == &dev_attr_pause_lo)
+ return sprintf(buf, "%ld\n", lpg->ramp_lo_pause_ms);
+ else if (attr == &dev_attr_pause_hi)
+ return sprintf(buf, "%ld\n", lpg->ramp_hi_pause_ms);
+ else if (attr == &dev_attr_pattern)
+ return qcom_lpg_lut_show(lpg->pattern, buf);
+
+ return -EINVAL;
+}
+
+static ssize_t lpg_attr_set(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct lpg *lpg = dev_get_drvdata(dev);
+ int ret = -EINVAL;
+
+ if (attr == &dev_attr_ping_pong)
+ ret = strtobool(buf, &lpg->ramp_ping_pong);
+ else if (attr == &dev_attr_oneshot)
+ ret = strtobool(buf, &lpg->ramp_oneshot);
+ else if (attr == &dev_attr_reverse)
+ ret = strtobool(buf, &lpg->ramp_reverse);
+ else if (attr == &dev_attr_duration)
+ ret = kstrtoul(buf, 10, &lpg->ramp_duration_ms);
+ else if (attr == &dev_attr_pause_lo)
+ ret = kstrtoul(buf, 10, &lpg->ramp_lo_pause_ms);
+ else if (attr == &dev_attr_pause_hi)
+ ret = kstrtoul(buf, 10, &lpg->ramp_hi_pause_ms);
+ else if (attr == &dev_attr_pattern)
+ ret = lpg_pattern_store(lpg, buf, count);
+
+ if (ret < 0)
+ return -EINVAL;
+
+ lpg_apply(lpg);
+ return count;
+}
+
+static struct attribute *lpg_attributes[] = {
+ &dev_attr_ping_pong.attr,
+ &dev_attr_oneshot.attr,
+ &dev_attr_reverse.attr,
+ &dev_attr_pattern.attr,
+ &dev_attr_duration.attr,
+ &dev_attr_pause_lo.attr,
+ &dev_attr_pause_hi.attr,
+ NULL
+};
+
+static const struct attribute_group lpg_attr_group = {
+ .attrs = lpg_attributes,
+};
+
+static const struct attribute_group *lpg_attr_groups[] = {
+ &lpg_attr_group,
+ NULL
+};
+
+static int lpg_register_pwm(struct lpg *lpg)
+{
+ int ret;
+
+ lpg->chip.base = -1;
+ lpg->chip.dev = lpg->dev;
+ lpg->chip.npwm = 1;
+ lpg->chip.ops = &lpg_pwm_ops;
+
+ ret = pwmchip_add(&lpg->chip);
+ if (ret)
+ dev_err(lpg->dev, "failed to add PWM chip: ret %d\n", ret);
+
+ return ret;
+}
+
+static int lpg_parse_lut(struct lpg *lpg)
+{
+ struct device_node *np = lpg->dev->of_node;
+ u16 *pattern;
+ u32 val;
+ int len;
+
+ lpg->lut = qcom_lpg_lut_get(lpg->dev);
+ if (IS_ERR_OR_NULL(lpg->lut))
+ return PTR_ERR(lpg->lut);
+
+ if (!of_find_property(np, "qcom,pattern", NULL))
+ return 0;
+
+ len = of_property_count_elems_of_size(np, "qcom,pattern", sizeof(u16));
+ if (len < 0)
+ return -EINVAL;
+
+ pattern = kcalloc(len, sizeof(u16), GFP_KERNEL);
+ if (!pattern)
+ return -ENOMEM;
+
+ of_property_read_u16_array(np, "qcom,pattern", pattern, len);
+
+ lpg->pattern = qcom_lpg_lut_store(lpg->lut, pattern, len);
+ kfree(pattern);
+ if (IS_ERR(lpg->pattern))
+ return PTR_ERR(lpg->pattern);
+
+ if (!of_property_read_u32(np, "qcom,pattern-length-ms", &val))
+ lpg->ramp_duration_ms = val;
+ if (!of_property_read_u32(np, "qcom,pattern-pause-lo-ms", &val))
+ lpg->ramp_lo_pause_ms = val;
+ if (!of_property_read_u32(np, "qcom,pattern-pause-hi-ms", &val))
+ lpg->ramp_hi_pause_ms = val;
+
+ lpg->ramp_ping_pong = of_property_read_bool(np, "qcom,pattern-ping-pong");
+ lpg->ramp_oneshot = of_property_read_bool(np, "qcom,pattern-oneshot");
+ lpg->ramp_reverse = of_property_read_bool(np, "qcom,pattern-reverse");
+
+ return 0;
+}
+
+static int lpg_register_led(struct lpg *lpg)
+{
+ struct device_node *np = lpg->dev->of_node;
+ const char *state;
+ int ret;
+
+ ret = lpg_parse_lut(lpg);
+ if (ret)
+ return ret;
+
+ /* Use label else node name */
+ lpg->cdev.name = of_get_property(np, "label", NULL) ? : np->name;
+ lpg->cdev.default_trigger = of_get_property(np, "linux,default-trigger", NULL);
+ lpg->cdev.brightness_set = lpg_brightnes_set;
+ lpg->cdev.brightness_get = lpg_brightnes_get;
+ lpg->cdev.blink_set = lpg_blink_set;
+ lpg->cdev.max_brightness = 255;
+ lpg->cdev.groups = lpg_attr_groups;
+
+ if (!of_property_read_string(np, "default-state", &state) &&
+ !strcmp(state, "on"))
+ lpg->cdev.brightness = LED_FULL;
+ else
+ lpg->cdev.brightness = LED_OFF;
+
+ lpg_brightnes_set(&lpg->cdev, lpg->cdev.brightness);
+
+ ret = devm_led_classdev_register(lpg->dev, &lpg->cdev);
+ if (ret)
+ dev_err(lpg->dev, "unable to register \"%s\"\n", lpg->cdev.name);
+
+ return ret;
+}
+
+static int lpg_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct lpg *lpg;
+ u32 dtest[2];
+ int ret;
+
+ lpg = devm_kzalloc(&pdev->dev, sizeof(*lpg), GFP_KERNEL);
+ if (!lpg)
+ return -ENOMEM;
+
+ lpg->dev = &pdev->dev;
+
+ lpg->map = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!lpg->map) {
+ dev_err(&pdev->dev, "parent regmap unavailable\n");
+ return -ENXIO;
+ }
+
+ ret = of_property_read_u32(np, "reg", &lpg->reg);
+ if (ret) {
+ dev_err(&pdev->dev, "no register offset specified\n");
+ return -EINVAL;
+ }
+
+ if (!of_find_property(np, "#pwm-cells", NULL))
+ lpg->is_lpg = true;
+
+ lpg->tri_led = qcom_tri_led_get(&pdev->dev);
+ if (IS_ERR(lpg->tri_led))
+ return PTR_ERR(lpg->tri_led);
+
+ ret = of_property_read_u32_array(np, "qcom,dtest", dtest, 2);
+ if (!ret) {
+ lpg->dtest_line = dtest[0];
+ lpg->dtest_value = dtest[1];
+ }
+
+ if (lpg->is_lpg) {
+ ret = lpg_register_led(lpg);
+ if (ret)
+ return ret;
+ } else {
+ ret = lpg_register_pwm(lpg);
+ if (ret)
+ return ret;
+ }
+
+ lpg_apply_dtest(lpg);
+
+ platform_set_drvdata(pdev, lpg);
+
+ return 0;
+}
+
+static int lpg_remove(struct platform_device *pdev)
+{
+ struct lpg *lpg = platform_get_drvdata(pdev);
+
+ if (!lpg->is_lpg)
+ pwmchip_remove(&lpg->chip);
+
+ qcom_lpg_lut_free(lpg->pattern);
+
+ return 0;
+}
+
+static const struct of_device_id lpg_of_table[] = {
+ { .compatible = "qcom,spmi-lpg" },
+ {},
+};
+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 TRI LED driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/leds/leds-qcom-lpg.h b/drivers/leds/leds-qcom-lpg.h
new file mode 100644
index 000000000000..f2abb106133d
--- /dev/null
+++ b/drivers/leds/leds-qcom-lpg.h
@@ -0,0 +1,30 @@
+#ifndef __LEDS_QCOM_LPG_H__
+#define __LEDS_QCOM_LPG_H__
+
+struct qcom_tri_led;
+struct qcom_lpg_lut;
+
+/*
+ * qcom_lpg_pattern - object tracking allocated LUT entries
+ * @lut: reference to the client & LUT device context
+ * @lo_idx: index of first entry in the LUT used by pattern
+ * @hi_idx: index of the last entry in the LUT used by pattern
+ */
+struct qcom_lpg_pattern {
+ struct qcom_lpg_lut *lut;
+
+ unsigned int lo_idx;
+ unsigned int hi_idx;
+};
+
+struct qcom_tri_led *qcom_tri_led_get(struct device *dev);
+int qcom_tri_led_set(struct qcom_tri_led *tri, bool enabled);
+
+struct qcom_lpg_lut *qcom_lpg_lut_get(struct device *dev);
+struct qcom_lpg_pattern *qcom_lpg_lut_store(struct qcom_lpg_lut *lut,
+ const u16 *values, size_t len);
+ssize_t qcom_lpg_lut_show(struct qcom_lpg_pattern *pattern, char *buf);
+void qcom_lpg_lut_free(struct qcom_lpg_pattern *pattern);
+int qcom_lpg_lut_sync(struct qcom_lpg_lut *lut);
+
+#endif
diff --git a/drivers/leds/leds-qcom-triled.c b/drivers/leds/leds-qcom-triled.c
new file mode 100644
index 000000000000..ce3de613be5b
--- /dev/null
+++ b/drivers/leds/leds-qcom-triled.c
@@ -0,0 +1,193 @@
+/* Copyright (c) 2017 Linaro Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "leds-qcom-lpg.h"
+
+#define TRI_LED_SRC_SEL 0x45
+#define TRI_LED_EN_CTL 0x46
+#define TRI_LED_ATC_CTL 0x47
+
+#define TRI_LED_COUNT 3
+
+static struct platform_driver tri_led_driver;
+
+/*
+ * tri_led_dev - TRILED device context
+ * @dev: struct device reference
+ * @map: regmap for register access
+ * @reg: base address of TRILED block
+ */
+struct tri_led_dev {
+ struct device *dev;
+ struct regmap *map;
+
+ u32 reg;
+};
+
+/*
+ * qcom_tri_led - representation of a single color
+ * @tdev: TRILED device reference
+ * @color: color of this object 0 <= color < 3
+ */
+struct qcom_tri_led {
+ struct tri_led_dev *tdev;
+ u8 color;
+};
+
+static void tri_led_release(struct device *dev, void *res)
+{
+ struct qcom_tri_led *tri = res;
+ struct tri_led_dev *tdev = tri->tdev;
+
+ put_device(tdev->dev);
+}
+
+/**
+ * qcom_tri_led_get() - acquire a reference to a single color of the TRILED
+ * @dev: struct device of the client
+ *
+ * Returned devres allocated TRILED color object, NULL if client lacks TRILED
+ * reference or ERR_PTR on failure.
+ */
+struct qcom_tri_led *qcom_tri_led_get(struct device *dev)
+{
+ struct platform_device *pdev;
+ struct of_phandle_args args;
+ struct qcom_tri_led *tri;
+ int ret;
+
+ ret = of_parse_phandle_with_fixed_args(dev->of_node,
+ "qcom,tri-led", 1, 0, &args);
+ if (ret)
+ return NULL;
+
+ pdev = of_find_device_by_node(args.np);
+ of_node_put(args.np);
+ if (!pdev || !pdev->dev.driver)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ if (pdev->dev.driver != &tri_led_driver.driver) {
+ dev_err(dev, "referenced node is not a tri-led\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (args.args[0] >= TRI_LED_COUNT) {
+ dev_err(dev, "invalid color\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ tri = devres_alloc(tri_led_release, sizeof(*tri), GFP_KERNEL);
+ if (!tri)
+ return ERR_PTR(-ENOMEM);
+
+ tri->tdev = platform_get_drvdata(pdev);
+ tri->color = args.args[0];
+
+ devres_add(dev, tri);
+
+ return tri;
+}
+EXPORT_SYMBOL_GPL(qcom_tri_led_get);
+
+/**
+ * qcom_tri_led_set() - enable/disable a TRILED output
+ * @tri: TRILED color object reference
+ * @enable: new state of the output
+ *
+ * Returns 0 on success, negative errno on failure.
+ */
+int qcom_tri_led_set(struct qcom_tri_led *tri, bool enable)
+{
+ struct tri_led_dev *tdev = tri->tdev;
+ unsigned int mask;
+ unsigned int val;
+
+ /* red, green, blue are mapped to bits 7, 6 and 5 respectively */
+ mask = BIT(7 - tri->color);
+ val = enable ? mask : 0;
+
+ return regmap_update_bits(tdev->map, tdev->reg + TRI_LED_EN_CTL,
+ mask, val);
+}
+EXPORT_SYMBOL_GPL(qcom_tri_led_set);
+
+static int tri_led_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct tri_led_dev *tri;
+ u32 src_sel;
+ int ret;
+
+ tri = devm_kzalloc(&pdev->dev, sizeof(*tri), GFP_KERNEL);
+ if (!tri)
+ return -ENOMEM;
+
+ tri->dev = &pdev->dev;
+
+ tri->map = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!tri->map) {
+ dev_err(&pdev->dev, "parent regmap unavailable\n");
+ return -ENXIO;
+ }
+
+ ret = of_property_read_u32(np, "reg", &tri->reg);
+ if (ret) {
+ dev_err(&pdev->dev, "no register offset specified\n");
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32(np, "qcom,power-source", &src_sel);
+ if (ret || src_sel == 2 || src_sel > 3) {
+ dev_err(&pdev->dev, "invalid power source\n");
+ return -EINVAL;
+ }
+
+ /* Disable automatic trickle charge LED */
+ regmap_write(tri->map, tri->reg + TRI_LED_ATC_CTL, 0);
+
+ /* Configure power source */
+ regmap_write(tri->map, tri->reg + TRI_LED_SRC_SEL, src_sel);
+
+ /* Default all outputs to off */
+ regmap_write(tri->map, tri->reg + TRI_LED_EN_CTL, 0);
+
+ platform_set_drvdata(pdev, tri);
+
+ return 0;
+}
+
+static const struct of_device_id tri_led_of_table[] = {
+ { .compatible = "qcom,spmi-tri-led" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, tri_led_of_table);
+
+static struct platform_driver tri_led_driver = {
+ .probe = tri_led_probe,
+ .driver = {
+ .name = "qcom_tri_led",
+ .of_match_table = tri_led_of_table,
+ },
+};
+module_platform_driver(tri_led_driver);
+
+MODULE_DESCRIPTION("Qualcomm TRI LED driver");
+MODULE_LICENSE("GPL v2");
--
2.12.0
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