leds: add Qualcomm PM8941 WLED driver
This adds support for the WLED ('White' LED) block on Qualcomm's
PM8941 PMICs.
(cooloney@gmail.com: remove unneeded semicolon)
Signed-off-by: Courtney Cavin <courtney.cavin@sonymobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Courtney Cavin
Bryan Wu
Родитель
cbbd896f25
Коммит
93c64f1ea1
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@ -526,6 +526,14 @@ config LEDS_VERSATILE
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This option enabled support for the LEDs on the ARM Versatile
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and RealView boards. Say Y to enabled these.
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config LEDS_PM8941_WLED
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tristate "LED support for the Qualcomm PM8941 WLED block"
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depends on LEDS_CLASS
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select REGMAP
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help
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This option enables support for the 'White' LED block
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on Qualcomm PM8941 PMICs.
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comment "LED Triggers"
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source "drivers/leds/trigger/Kconfig"
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@ -58,6 +58,7 @@ obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o
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obj-$(CONFIG_LEDS_SYSCON) += leds-syscon.o
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obj-$(CONFIG_LEDS_VERSATILE) += leds-versatile.o
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obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o
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obj-$(CONFIG_LEDS_PM8941_WLED) += leds-pm8941-wled.o
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# LED SPI Drivers
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obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
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@ -0,0 +1,435 @@
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/* Copyright (c) 2015, Sony Mobile Communications, AB.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#define PM8941_WLED_REG_VAL_BASE 0x40
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#define PM8941_WLED_REG_VAL_MAX 0xFFF
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#define PM8941_WLED_REG_MOD_EN 0x46
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#define PM8941_WLED_REG_MOD_EN_BIT BIT(7)
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#define PM8941_WLED_REG_MOD_EN_MASK BIT(7)
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#define PM8941_WLED_REG_SYNC 0x47
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#define PM8941_WLED_REG_SYNC_MASK 0x07
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#define PM8941_WLED_REG_SYNC_LED1 BIT(0)
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#define PM8941_WLED_REG_SYNC_LED2 BIT(1)
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#define PM8941_WLED_REG_SYNC_LED3 BIT(2)
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#define PM8941_WLED_REG_SYNC_ALL 0x07
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#define PM8941_WLED_REG_SYNC_CLEAR 0x00
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#define PM8941_WLED_REG_FREQ 0x4c
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#define PM8941_WLED_REG_FREQ_MASK 0x0f
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#define PM8941_WLED_REG_OVP 0x4d
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#define PM8941_WLED_REG_OVP_MASK 0x03
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#define PM8941_WLED_REG_BOOST 0x4e
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#define PM8941_WLED_REG_BOOST_MASK 0x07
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#define PM8941_WLED_REG_SINK 0x4f
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#define PM8941_WLED_REG_SINK_MASK 0xe0
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#define PM8941_WLED_REG_SINK_SHFT 0x05
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/* Per-'string' registers below */
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#define PM8941_WLED_REG_STR_OFFSET 0x10
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#define PM8941_WLED_REG_STR_MOD_EN_BASE 0x60
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#define PM8941_WLED_REG_STR_MOD_MASK BIT(7)
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#define PM8941_WLED_REG_STR_MOD_EN BIT(7)
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#define PM8941_WLED_REG_STR_SCALE_BASE 0x62
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#define PM8941_WLED_REG_STR_SCALE_MASK 0x1f
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#define PM8941_WLED_REG_STR_MOD_SRC_BASE 0x63
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#define PM8941_WLED_REG_STR_MOD_SRC_MASK 0x01
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#define PM8941_WLED_REG_STR_MOD_SRC_INT 0x00
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#define PM8941_WLED_REG_STR_MOD_SRC_EXT 0x01
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#define PM8941_WLED_REG_STR_CABC_BASE 0x66
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#define PM8941_WLED_REG_STR_CABC_MASK BIT(7)
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#define PM8941_WLED_REG_STR_CABC_EN BIT(7)
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struct pm8941_wled_config {
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u32 i_boost_limit;
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u32 ovp;
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u32 switch_freq;
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u32 num_strings;
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u32 i_limit;
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bool cs_out_en;
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bool ext_gen;
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bool cabc_en;
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};
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struct pm8941_wled {
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struct regmap *regmap;
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u16 addr;
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struct led_classdev cdev;
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struct pm8941_wled_config cfg;
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};
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static int pm8941_wled_set(struct led_classdev *cdev,
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enum led_brightness value)
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{
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struct pm8941_wled *wled;
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u8 ctrl = 0;
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u16 val;
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int rc;
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int i;
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wled = container_of(cdev, struct pm8941_wled, cdev);
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if (value != 0)
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ctrl = PM8941_WLED_REG_MOD_EN_BIT;
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val = value * PM8941_WLED_REG_VAL_MAX / LED_FULL;
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rc = regmap_update_bits(wled->regmap,
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wled->addr + PM8941_WLED_REG_MOD_EN,
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PM8941_WLED_REG_MOD_EN_MASK, ctrl);
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if (rc)
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return rc;
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for (i = 0; i < wled->cfg.num_strings; ++i) {
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u8 v[2] = { val & 0xff, (val >> 8) & 0xf };
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rc = regmap_bulk_write(wled->regmap,
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wled->addr + PM8941_WLED_REG_VAL_BASE + 2 * i,
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v, 2);
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if (rc)
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return rc;
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}
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rc = regmap_update_bits(wled->regmap,
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wled->addr + PM8941_WLED_REG_SYNC,
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PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_ALL);
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if (rc)
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return rc;
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rc = regmap_update_bits(wled->regmap,
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wled->addr + PM8941_WLED_REG_SYNC,
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PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_CLEAR);
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return rc;
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}
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static void pm8941_wled_set_brightness(struct led_classdev *cdev,
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enum led_brightness value)
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{
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if (pm8941_wled_set(cdev, value)) {
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dev_err(cdev->dev, "Unable to set brightness\n");
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return;
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}
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cdev->brightness = value;
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}
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static int pm8941_wled_setup(struct pm8941_wled *wled)
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{
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int rc;
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int i;
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rc = regmap_update_bits(wled->regmap,
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wled->addr + PM8941_WLED_REG_OVP,
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PM8941_WLED_REG_OVP_MASK, wled->cfg.ovp);
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if (rc)
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return rc;
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rc = regmap_update_bits(wled->regmap,
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wled->addr + PM8941_WLED_REG_BOOST,
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PM8941_WLED_REG_BOOST_MASK, wled->cfg.i_boost_limit);
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if (rc)
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return rc;
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rc = regmap_update_bits(wled->regmap,
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wled->addr + PM8941_WLED_REG_FREQ,
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PM8941_WLED_REG_FREQ_MASK, wled->cfg.switch_freq);
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if (rc)
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return rc;
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if (wled->cfg.cs_out_en) {
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u8 all = (BIT(wled->cfg.num_strings) - 1)
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<< PM8941_WLED_REG_SINK_SHFT;
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rc = regmap_update_bits(wled->regmap,
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wled->addr + PM8941_WLED_REG_SINK,
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PM8941_WLED_REG_SINK_MASK, all);
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if (rc)
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return rc;
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}
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for (i = 0; i < wled->cfg.num_strings; ++i) {
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u16 addr = wled->addr + PM8941_WLED_REG_STR_OFFSET * i;
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rc = regmap_update_bits(wled->regmap,
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addr + PM8941_WLED_REG_STR_MOD_EN_BASE,
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PM8941_WLED_REG_STR_MOD_MASK,
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PM8941_WLED_REG_STR_MOD_EN);
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if (rc)
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return rc;
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if (wled->cfg.ext_gen) {
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rc = regmap_update_bits(wled->regmap,
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addr + PM8941_WLED_REG_STR_MOD_SRC_BASE,
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PM8941_WLED_REG_STR_MOD_SRC_MASK,
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PM8941_WLED_REG_STR_MOD_SRC_EXT);
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if (rc)
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return rc;
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}
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rc = regmap_update_bits(wled->regmap,
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addr + PM8941_WLED_REG_STR_SCALE_BASE,
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PM8941_WLED_REG_STR_SCALE_MASK,
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wled->cfg.i_limit);
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if (rc)
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return rc;
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rc = regmap_update_bits(wled->regmap,
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addr + PM8941_WLED_REG_STR_CABC_BASE,
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PM8941_WLED_REG_STR_CABC_MASK,
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wled->cfg.cabc_en ?
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PM8941_WLED_REG_STR_CABC_EN : 0);
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if (rc)
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return rc;
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}
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return 0;
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}
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static const struct pm8941_wled_config pm8941_wled_config_defaults = {
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.i_boost_limit = 3,
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.i_limit = 20,
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.ovp = 2,
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.switch_freq = 5,
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.num_strings = 0,
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.cs_out_en = false,
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.ext_gen = false,
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.cabc_en = false,
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};
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struct pm8941_wled_var_cfg {
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const u32 *values;
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u32 (*fn)(u32);
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int size;
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};
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static const u32 pm8941_wled_i_boost_limit_values[] = {
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105, 385, 525, 805, 980, 1260, 1400, 1680,
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};
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static const struct pm8941_wled_var_cfg pm8941_wled_i_boost_limit_cfg = {
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.values = pm8941_wled_i_boost_limit_values,
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.size = ARRAY_SIZE(pm8941_wled_i_boost_limit_values),
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};
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static const u32 pm8941_wled_ovp_values[] = {
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35, 32, 29, 27,
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};
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static const struct pm8941_wled_var_cfg pm8941_wled_ovp_cfg = {
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.values = pm8941_wled_ovp_values,
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.size = ARRAY_SIZE(pm8941_wled_ovp_values),
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};
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static u32 pm8941_wled_num_strings_values_fn(u32 idx)
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{
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return idx + 1;
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}
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static const struct pm8941_wled_var_cfg pm8941_wled_num_strings_cfg = {
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.fn = pm8941_wled_num_strings_values_fn,
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.size = 3,
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};
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static u32 pm8941_wled_switch_freq_values_fn(u32 idx)
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{
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return 19200 / (2 * (1 + idx));
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}
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static const struct pm8941_wled_var_cfg pm8941_wled_switch_freq_cfg = {
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.fn = pm8941_wled_switch_freq_values_fn,
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.size = 16,
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};
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static const struct pm8941_wled_var_cfg pm8941_wled_i_limit_cfg = {
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.size = 26,
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};
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static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx)
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{
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if (idx >= cfg->size)
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return UINT_MAX;
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if (cfg->fn)
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return cfg->fn(idx);
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if (cfg->values)
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return cfg->values[idx];
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return idx;
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}
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static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
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{
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struct pm8941_wled_config *cfg = &wled->cfg;
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u32 val;
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int rc;
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u32 c;
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int i;
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int j;
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const struct {
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const char *name;
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u32 *val_ptr;
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const struct pm8941_wled_var_cfg *cfg;
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} u32_opts[] = {
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{
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"qcom,current-boost-limit",
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&cfg->i_boost_limit,
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.cfg = &pm8941_wled_i_boost_limit_cfg,
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},
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{
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"qcom,current-limit",
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&cfg->i_limit,
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.cfg = &pm8941_wled_i_limit_cfg,
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},
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{
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"qcom,ovp",
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&cfg->ovp,
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.cfg = &pm8941_wled_ovp_cfg,
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},
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{
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"qcom,switching-freq",
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&cfg->switch_freq,
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.cfg = &pm8941_wled_switch_freq_cfg,
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},
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{
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"qcom,num-strings",
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&cfg->num_strings,
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.cfg = &pm8941_wled_num_strings_cfg,
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},
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};
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const struct {
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const char *name;
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bool *val_ptr;
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} bool_opts[] = {
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{ "qcom,cs-out", &cfg->cs_out_en, },
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{ "qcom,ext-gen", &cfg->ext_gen, },
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{ "qcom,cabc", &cfg->cabc_en, },
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};
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rc = of_property_read_u32(dev->of_node, "reg", &val);
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if (rc || val > 0xffff) {
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dev_err(dev, "invalid IO resources\n");
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return rc ? rc : -EINVAL;
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}
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wled->addr = val;
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rc = of_property_read_string(dev->of_node, "label", &wled->cdev.name);
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if (rc)
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wled->cdev.name = dev->of_node->name;
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wled->cdev.default_trigger = of_get_property(dev->of_node,
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"linux,default-trigger", NULL);
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*cfg = pm8941_wled_config_defaults;
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for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) {
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rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
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if (rc == -EINVAL) {
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continue;
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} else if (rc) {
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dev_err(dev, "error reading '%s'\n", u32_opts[i].name);
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return rc;
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}
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c = UINT_MAX;
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for (j = 0; c != val; j++) {
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c = pm8941_wled_values(u32_opts[i].cfg, j);
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if (c == UINT_MAX) {
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dev_err(dev, "invalid value for '%s'\n",
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u32_opts[i].name);
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return -EINVAL;
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}
|
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}
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dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c);
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*u32_opts[i].val_ptr = j;
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}
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for (i = 0; i < ARRAY_SIZE(bool_opts); ++i) {
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if (of_property_read_bool(dev->of_node, bool_opts[i].name))
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*bool_opts[i].val_ptr = true;
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}
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cfg->num_strings = cfg->num_strings + 1;
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return 0;
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}
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static int pm8941_wled_probe(struct platform_device *pdev)
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{
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struct pm8941_wled *wled;
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struct regmap *regmap;
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int rc;
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regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!regmap) {
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dev_err(&pdev->dev, "Unable to get regmap\n");
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return -EINVAL;
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}
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wled = devm_kzalloc(&pdev->dev, sizeof(*wled), GFP_KERNEL);
|
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if (!wled)
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return -ENOMEM;
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wled->regmap = regmap;
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rc = pm8941_wled_configure(wled, &pdev->dev);
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if (rc)
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return rc;
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rc = pm8941_wled_setup(wled);
|
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if (rc)
|
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return rc;
|
||||
|
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wled->cdev.brightness_set = pm8941_wled_set_brightness;
|
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|
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rc = devm_led_classdev_register(&pdev->dev, &wled->cdev);
|
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if (rc)
|
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return rc;
|
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|
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platform_set_drvdata(pdev, wled);
|
||||
|
||||
return 0;
|
||||
};
|
||||
|
||||
static const struct of_device_id pm8941_wled_match_table[] = {
|
||||
{ .compatible = "qcom,pm8941-wled" },
|
||||
{}
|
||||
};
|
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MODULE_DEVICE_TABLE(of, pm8941_wled_match_table);
|
||||
|
||||
static struct platform_driver pm8941_wled_driver = {
|
||||
.probe = pm8941_wled_probe,
|
||||
.driver = {
|
||||
.name = "pm8941-wled",
|
||||
.of_match_table = pm8941_wled_match_table,
|
||||
},
|
||||
};
|
||||
|
||||
module_platform_driver(pm8941_wled_driver);
|
||||
|
||||
MODULE_DESCRIPTION("pm8941 wled driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_ALIAS("platform:pm8941-wled");
|
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