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alistair23-linux/drivers/video/backlight/pm8941-wled.c
Thomas Gleixner 97fb5e8d9b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 294 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141900.825281744@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:36:37 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2015, Sony Mobile Communications, AB.
*/
#include <linux/kernel.h>
#include <linux/backlight.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
/* From DT binding */
#define PM8941_WLED_DEFAULT_BRIGHTNESS 2048
#define PM8941_WLED_REG_VAL_BASE 0x40
#define PM8941_WLED_REG_VAL_MAX 0xFFF
#define PM8941_WLED_REG_MOD_EN 0x46
#define PM8941_WLED_REG_MOD_EN_BIT BIT(7)
#define PM8941_WLED_REG_MOD_EN_MASK BIT(7)
#define PM8941_WLED_REG_SYNC 0x47
#define PM8941_WLED_REG_SYNC_MASK 0x07
#define PM8941_WLED_REG_SYNC_LED1 BIT(0)
#define PM8941_WLED_REG_SYNC_LED2 BIT(1)
#define PM8941_WLED_REG_SYNC_LED3 BIT(2)
#define PM8941_WLED_REG_SYNC_ALL 0x07
#define PM8941_WLED_REG_SYNC_CLEAR 0x00
#define PM8941_WLED_REG_FREQ 0x4c
#define PM8941_WLED_REG_FREQ_MASK 0x0f
#define PM8941_WLED_REG_OVP 0x4d
#define PM8941_WLED_REG_OVP_MASK 0x03
#define PM8941_WLED_REG_BOOST 0x4e
#define PM8941_WLED_REG_BOOST_MASK 0x07
#define PM8941_WLED_REG_SINK 0x4f
#define PM8941_WLED_REG_SINK_MASK 0xe0
#define PM8941_WLED_REG_SINK_SHFT 0x05
/* Per-'string' registers below */
#define PM8941_WLED_REG_STR_OFFSET 0x10
#define PM8941_WLED_REG_STR_MOD_EN_BASE 0x60
#define PM8941_WLED_REG_STR_MOD_MASK BIT(7)
#define PM8941_WLED_REG_STR_MOD_EN BIT(7)
#define PM8941_WLED_REG_STR_SCALE_BASE 0x62
#define PM8941_WLED_REG_STR_SCALE_MASK 0x1f
#define PM8941_WLED_REG_STR_MOD_SRC_BASE 0x63
#define PM8941_WLED_REG_STR_MOD_SRC_MASK 0x01
#define PM8941_WLED_REG_STR_MOD_SRC_INT 0x00
#define PM8941_WLED_REG_STR_MOD_SRC_EXT 0x01
#define PM8941_WLED_REG_STR_CABC_BASE 0x66
#define PM8941_WLED_REG_STR_CABC_MASK BIT(7)
#define PM8941_WLED_REG_STR_CABC_EN BIT(7)
struct pm8941_wled_config {
u32 i_boost_limit;
u32 ovp;
u32 switch_freq;
u32 num_strings;
u32 i_limit;
bool cs_out_en;
bool ext_gen;
bool cabc_en;
};
struct pm8941_wled {
const char *name;
struct regmap *regmap;
u16 addr;
struct pm8941_wled_config cfg;
};
static int pm8941_wled_update_status(struct backlight_device *bl)
{
struct pm8941_wled *wled = bl_get_data(bl);
u16 val = bl->props.brightness;
u8 ctrl = 0;
int rc;
int i;
if (bl->props.power != FB_BLANK_UNBLANK ||
bl->props.fb_blank != FB_BLANK_UNBLANK ||
bl->props.state & BL_CORE_FBBLANK)
val = 0;
if (val != 0)
ctrl = PM8941_WLED_REG_MOD_EN_BIT;
rc = regmap_update_bits(wled->regmap,
wled->addr + PM8941_WLED_REG_MOD_EN,
PM8941_WLED_REG_MOD_EN_MASK, ctrl);
if (rc)
return rc;
for (i = 0; i < wled->cfg.num_strings; ++i) {
u8 v[2] = { val & 0xff, (val >> 8) & 0xf };
rc = regmap_bulk_write(wled->regmap,
wled->addr + PM8941_WLED_REG_VAL_BASE + 2 * i,
v, 2);
if (rc)
return rc;
}
rc = regmap_update_bits(wled->regmap,
wled->addr + PM8941_WLED_REG_SYNC,
PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_ALL);
if (rc)
return rc;
rc = regmap_update_bits(wled->regmap,
wled->addr + PM8941_WLED_REG_SYNC,
PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_CLEAR);
return rc;
}
static int pm8941_wled_setup(struct pm8941_wled *wled)
{
int rc;
int i;
rc = regmap_update_bits(wled->regmap,
wled->addr + PM8941_WLED_REG_OVP,
PM8941_WLED_REG_OVP_MASK, wled->cfg.ovp);
if (rc)
return rc;
rc = regmap_update_bits(wled->regmap,
wled->addr + PM8941_WLED_REG_BOOST,
PM8941_WLED_REG_BOOST_MASK, wled->cfg.i_boost_limit);
if (rc)
return rc;
rc = regmap_update_bits(wled->regmap,
wled->addr + PM8941_WLED_REG_FREQ,
PM8941_WLED_REG_FREQ_MASK, wled->cfg.switch_freq);
if (rc)
return rc;
if (wled->cfg.cs_out_en) {
u8 all = (BIT(wled->cfg.num_strings) - 1)
<< PM8941_WLED_REG_SINK_SHFT;
rc = regmap_update_bits(wled->regmap,
wled->addr + PM8941_WLED_REG_SINK,
PM8941_WLED_REG_SINK_MASK, all);
if (rc)
return rc;
}
for (i = 0; i < wled->cfg.num_strings; ++i) {
u16 addr = wled->addr + PM8941_WLED_REG_STR_OFFSET * i;
rc = regmap_update_bits(wled->regmap,
addr + PM8941_WLED_REG_STR_MOD_EN_BASE,
PM8941_WLED_REG_STR_MOD_MASK,
PM8941_WLED_REG_STR_MOD_EN);
if (rc)
return rc;
if (wled->cfg.ext_gen) {
rc = regmap_update_bits(wled->regmap,
addr + PM8941_WLED_REG_STR_MOD_SRC_BASE,
PM8941_WLED_REG_STR_MOD_SRC_MASK,
PM8941_WLED_REG_STR_MOD_SRC_EXT);
if (rc)
return rc;
}
rc = regmap_update_bits(wled->regmap,
addr + PM8941_WLED_REG_STR_SCALE_BASE,
PM8941_WLED_REG_STR_SCALE_MASK,
wled->cfg.i_limit);
if (rc)
return rc;
rc = regmap_update_bits(wled->regmap,
addr + PM8941_WLED_REG_STR_CABC_BASE,
PM8941_WLED_REG_STR_CABC_MASK,
wled->cfg.cabc_en ?
PM8941_WLED_REG_STR_CABC_EN : 0);
if (rc)
return rc;
}
return 0;
}
static const struct pm8941_wled_config pm8941_wled_config_defaults = {
.i_boost_limit = 3,
.i_limit = 20,
.ovp = 2,
.switch_freq = 5,
.num_strings = 0,
.cs_out_en = false,
.ext_gen = false,
.cabc_en = false,
};
struct pm8941_wled_var_cfg {
const u32 *values;
u32 (*fn)(u32);
int size;
};
static const u32 pm8941_wled_i_boost_limit_values[] = {
105, 385, 525, 805, 980, 1260, 1400, 1680,
};
static const struct pm8941_wled_var_cfg pm8941_wled_i_boost_limit_cfg = {
.values = pm8941_wled_i_boost_limit_values,
.size = ARRAY_SIZE(pm8941_wled_i_boost_limit_values),
};
static const u32 pm8941_wled_ovp_values[] = {
35, 32, 29, 27,
};
static const struct pm8941_wled_var_cfg pm8941_wled_ovp_cfg = {
.values = pm8941_wled_ovp_values,
.size = ARRAY_SIZE(pm8941_wled_ovp_values),
};
static u32 pm8941_wled_num_strings_values_fn(u32 idx)
{
return idx + 1;
}
static const struct pm8941_wled_var_cfg pm8941_wled_num_strings_cfg = {
.fn = pm8941_wled_num_strings_values_fn,
.size = 3,
};
static u32 pm8941_wled_switch_freq_values_fn(u32 idx)
{
return 19200 / (2 * (1 + idx));
}
static const struct pm8941_wled_var_cfg pm8941_wled_switch_freq_cfg = {
.fn = pm8941_wled_switch_freq_values_fn,
.size = 16,
};
static const struct pm8941_wled_var_cfg pm8941_wled_i_limit_cfg = {
.size = 26,
};
static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx)
{
if (idx >= cfg->size)
return UINT_MAX;
if (cfg->fn)
return cfg->fn(idx);
if (cfg->values)
return cfg->values[idx];
return idx;
}
static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
{
struct pm8941_wled_config *cfg = &wled->cfg;
u32 val;
int rc;
u32 c;
int i;
int j;
const struct {
const char *name;
u32 *val_ptr;
const struct pm8941_wled_var_cfg *cfg;
} u32_opts[] = {
{
"qcom,current-boost-limit",
&cfg->i_boost_limit,
.cfg = &pm8941_wled_i_boost_limit_cfg,
},
{
"qcom,current-limit",
&cfg->i_limit,
.cfg = &pm8941_wled_i_limit_cfg,
},
{
"qcom,ovp",
&cfg->ovp,
.cfg = &pm8941_wled_ovp_cfg,
},
{
"qcom,switching-freq",
&cfg->switch_freq,
.cfg = &pm8941_wled_switch_freq_cfg,
},
{
"qcom,num-strings",
&cfg->num_strings,
.cfg = &pm8941_wled_num_strings_cfg,
},
};
const struct {
const char *name;
bool *val_ptr;
} bool_opts[] = {
{ "qcom,cs-out", &cfg->cs_out_en, },
{ "qcom,ext-gen", &cfg->ext_gen, },
{ "qcom,cabc", &cfg->cabc_en, },
};
rc = of_property_read_u32(dev->of_node, "reg", &val);
if (rc || val > 0xffff) {
dev_err(dev, "invalid IO resources\n");
return rc ? rc : -EINVAL;
}
wled->addr = val;
rc = of_property_read_string(dev->of_node, "label", &wled->name);
if (rc)
wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);
*cfg = pm8941_wled_config_defaults;
for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) {
rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
if (rc == -EINVAL) {
continue;
} else if (rc) {
dev_err(dev, "error reading '%s'\n", u32_opts[i].name);
return rc;
}
c = UINT_MAX;
for (j = 0; c != val; j++) {
c = pm8941_wled_values(u32_opts[i].cfg, j);
if (c == UINT_MAX) {
dev_err(dev, "invalid value for '%s'\n",
u32_opts[i].name);
return -EINVAL;
}
}
dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c);
*u32_opts[i].val_ptr = j;
}
for (i = 0; i < ARRAY_SIZE(bool_opts); ++i) {
if (of_property_read_bool(dev->of_node, bool_opts[i].name))
*bool_opts[i].val_ptr = true;
}
cfg->num_strings = cfg->num_strings + 1;
return 0;
}
static const struct backlight_ops pm8941_wled_ops = {
.update_status = pm8941_wled_update_status,
};
static int pm8941_wled_probe(struct platform_device *pdev)
{
struct backlight_properties props;
struct backlight_device *bl;
struct pm8941_wled *wled;
struct regmap *regmap;
u32 val;
int rc;
regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!regmap) {
dev_err(&pdev->dev, "Unable to get regmap\n");
return -EINVAL;
}
wled = devm_kzalloc(&pdev->dev, sizeof(*wled), GFP_KERNEL);
if (!wled)
return -ENOMEM;
wled->regmap = regmap;
rc = pm8941_wled_configure(wled, &pdev->dev);
if (rc)
return rc;
rc = pm8941_wled_setup(wled);
if (rc)
return rc;
val = PM8941_WLED_DEFAULT_BRIGHTNESS;
of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.brightness = val;
props.max_brightness = PM8941_WLED_REG_VAL_MAX;
bl = devm_backlight_device_register(&pdev->dev, wled->name,
&pdev->dev, wled,
&pm8941_wled_ops, &props);
return PTR_ERR_OR_ZERO(bl);
};
static const struct of_device_id pm8941_wled_match_table[] = {
{ .compatible = "qcom,pm8941-wled" },
{}
};
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");
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