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linux/drivers/video/backlight/arcxcnn_bl.c
Thomas Gleixner caab277b1d treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 
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 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 you should have received a copy of the gnu general
  public license along with this program if not see http www gnu org
  licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 503 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Enrico Weigelt <info@metux.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:07 +02:00

409 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Backlight driver for ArcticSand ARC_X_C_0N_0N Devices
*
* Copyright 2016 ArcticSand, Inc.
* Author : Brian Dodge <bdodge@arcticsand.com>
*/
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
enum arcxcnn_chip_id {
ARC2C0608
};
/**
* struct arcxcnn_platform_data
* @name : Backlight driver name (NULL will use default)
* @initial_brightness : initial value of backlight brightness
* @leden : initial LED string enables, upper bit is global on/off
* @led_config_0 : fading speed (period between intensity steps)
* @led_config_1 : misc settings, see datasheet
* @dim_freq : pwm dimming frequency if in pwm mode
* @comp_config : misc config, see datasheet
* @filter_config : RC/PWM filter config, see datasheet
* @trim_config : full scale current trim, see datasheet
*/
struct arcxcnn_platform_data {
const char *name;
u16 initial_brightness;
u8 leden;
u8 led_config_0;
u8 led_config_1;
u8 dim_freq;
u8 comp_config;
u8 filter_config;
u8 trim_config;
};
#define ARCXCNN_CMD 0x00 /* Command Register */
#define ARCXCNN_CMD_STDBY 0x80 /* I2C Standby */
#define ARCXCNN_CMD_RESET 0x40 /* Reset */
#define ARCXCNN_CMD_BOOST 0x10 /* Boost */
#define ARCXCNN_CMD_OVP_MASK 0x0C /* --- Over Voltage Threshold */
#define ARCXCNN_CMD_OVP_XXV 0x0C /* <rsvrd> Over Voltage Threshold */
#define ARCXCNN_CMD_OVP_20V 0x08 /* 20v Over Voltage Threshold */
#define ARCXCNN_CMD_OVP_24V 0x04 /* 24v Over Voltage Threshold */
#define ARCXCNN_CMD_OVP_31V 0x00 /* 31.4v Over Voltage Threshold */
#define ARCXCNN_CMD_EXT_COMP 0x01 /* part (0) or full (1) ext. comp */
#define ARCXCNN_CONFIG 0x01 /* Configuration */
#define ARCXCNN_STATUS1 0x02 /* Status 1 */
#define ARCXCNN_STATUS2 0x03 /* Status 2 */
#define ARCXCNN_FADECTRL 0x04 /* Fading Control */
#define ARCXCNN_ILED_CONFIG 0x05 /* ILED Configuration */
#define ARCXCNN_ILED_DIM_PWM 0x00 /* config dim mode pwm */
#define ARCXCNN_ILED_DIM_INT 0x04 /* config dim mode internal */
#define ARCXCNN_LEDEN 0x06 /* LED Enable Register */
#define ARCXCNN_LEDEN_ISETEXT 0x80 /* Full-scale current set extern */
#define ARCXCNN_LEDEN_MASK 0x3F /* LED string enables mask */
#define ARCXCNN_LEDEN_BITS 0x06 /* Bits of LED string enables */
#define ARCXCNN_LEDEN_LED1 0x01
#define ARCXCNN_LEDEN_LED2 0x02
#define ARCXCNN_LEDEN_LED3 0x04
#define ARCXCNN_LEDEN_LED4 0x08
#define ARCXCNN_LEDEN_LED5 0x10
#define ARCXCNN_LEDEN_LED6 0x20
#define ARCXCNN_WLED_ISET_LSB 0x07 /* LED ISET LSB (in upper nibble) */
#define ARCXCNN_WLED_ISET_LSB_SHIFT 0x04 /* ISET LSB Left Shift */
#define ARCXCNN_WLED_ISET_MSB 0x08 /* LED ISET MSB (8 bits) */
#define ARCXCNN_DIMFREQ 0x09
#define ARCXCNN_COMP_CONFIG 0x0A
#define ARCXCNN_FILT_CONFIG 0x0B
#define ARCXCNN_IMAXTUNE 0x0C
#define ARCXCNN_ID_MSB 0x1E
#define ARCXCNN_ID_LSB 0x1F
#define MAX_BRIGHTNESS 4095
#define INIT_BRIGHT 60
struct arcxcnn {
struct i2c_client *client;
struct backlight_device *bl;
struct device *dev;
struct arcxcnn_platform_data *pdata;
};
static int arcxcnn_update_field(struct arcxcnn *lp, u8 reg, u8 mask, u8 data)
{
int ret;
u8 tmp;
ret = i2c_smbus_read_byte_data(lp->client, reg);
if (ret < 0) {
dev_err(lp->dev, "failed to read 0x%.2x\n", reg);
return ret;
}
tmp = (u8)ret;
tmp &= ~mask;
tmp |= data & mask;
return i2c_smbus_write_byte_data(lp->client, reg, tmp);
}
static int arcxcnn_set_brightness(struct arcxcnn *lp, u32 brightness)
{
int ret;
u8 val;
/* lower nibble of brightness goes in upper nibble of LSB register */
val = (brightness & 0xF) << ARCXCNN_WLED_ISET_LSB_SHIFT;
ret = i2c_smbus_write_byte_data(lp->client,
ARCXCNN_WLED_ISET_LSB, val);
if (ret < 0)
return ret;
/* remaining 8 bits of brightness go in MSB register */
val = (brightness >> 4);
return i2c_smbus_write_byte_data(lp->client,
ARCXCNN_WLED_ISET_MSB, val);
}
static int arcxcnn_bl_update_status(struct backlight_device *bl)
{
struct arcxcnn *lp = bl_get_data(bl);
u32 brightness = bl->props.brightness;
int ret;
if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
brightness = 0;
ret = arcxcnn_set_brightness(lp, brightness);
if (ret)
return ret;
/* set power-on/off/save modes */
return arcxcnn_update_field(lp, ARCXCNN_CMD, ARCXCNN_CMD_STDBY,
(bl->props.power == 0) ? 0 : ARCXCNN_CMD_STDBY);
}
static const struct backlight_ops arcxcnn_bl_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = arcxcnn_bl_update_status,
};
static int arcxcnn_backlight_register(struct arcxcnn *lp)
{
struct backlight_properties *props;
const char *name = lp->pdata->name ? : "arctic_bl";
props = devm_kzalloc(lp->dev, sizeof(*props), GFP_KERNEL);
if (!props)
return -ENOMEM;
props->type = BACKLIGHT_PLATFORM;
props->max_brightness = MAX_BRIGHTNESS;
if (lp->pdata->initial_brightness > props->max_brightness)
lp->pdata->initial_brightness = props->max_brightness;
props->brightness = lp->pdata->initial_brightness;
lp->bl = devm_backlight_device_register(lp->dev, name, lp->dev, lp,
&arcxcnn_bl_ops, props);
return PTR_ERR_OR_ZERO(lp->bl);
}
static void arcxcnn_parse_dt(struct arcxcnn *lp)
{
struct device *dev = lp->dev;
struct device_node *node = dev->of_node;
u32 prog_val, num_entry, entry, sources[ARCXCNN_LEDEN_BITS];
int ret;
/* device tree entry isn't required, defaults are OK */
if (!node)
return;
ret = of_property_read_string(node, "label", &lp->pdata->name);
if (ret < 0)
lp->pdata->name = NULL;
ret = of_property_read_u32(node, "default-brightness", &prog_val);
if (ret == 0)
lp->pdata->initial_brightness = prog_val;
ret = of_property_read_u32(node, "arc,led-config-0", &prog_val);
if (ret == 0)
lp->pdata->led_config_0 = (u8)prog_val;
ret = of_property_read_u32(node, "arc,led-config-1", &prog_val);
if (ret == 0)
lp->pdata->led_config_1 = (u8)prog_val;
ret = of_property_read_u32(node, "arc,dim-freq", &prog_val);
if (ret == 0)
lp->pdata->dim_freq = (u8)prog_val;
ret = of_property_read_u32(node, "arc,comp-config", &prog_val);
if (ret == 0)
lp->pdata->comp_config = (u8)prog_val;
ret = of_property_read_u32(node, "arc,filter-config", &prog_val);
if (ret == 0)
lp->pdata->filter_config = (u8)prog_val;
ret = of_property_read_u32(node, "arc,trim-config", &prog_val);
if (ret == 0)
lp->pdata->trim_config = (u8)prog_val;
ret = of_property_count_u32_elems(node, "led-sources");
if (ret < 0) {
lp->pdata->leden = ARCXCNN_LEDEN_MASK; /* all on is default */
} else {
num_entry = ret;
if (num_entry > ARCXCNN_LEDEN_BITS)
num_entry = ARCXCNN_LEDEN_BITS;
ret = of_property_read_u32_array(node, "led-sources", sources,
num_entry);
if (ret < 0) {
dev_err(dev, "led-sources node is invalid.\n");
return;
}
lp->pdata->leden = 0;
/* for each enable in source, set bit in led enable */
for (entry = 0; entry < num_entry; entry++) {
u8 onbit = 1 << sources[entry];
lp->pdata->leden |= onbit;
}
}
}
static int arcxcnn_probe(struct i2c_client *cl, const struct i2c_device_id *id)
{
struct arcxcnn *lp;
int ret;
if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
lp = devm_kzalloc(&cl->dev, sizeof(*lp), GFP_KERNEL);
if (!lp)
return -ENOMEM;
lp->client = cl;
lp->dev = &cl->dev;
lp->pdata = dev_get_platdata(&cl->dev);
/* reset the device */
ret = i2c_smbus_write_byte_data(lp->client,
ARCXCNN_CMD, ARCXCNN_CMD_RESET);
if (ret)
goto probe_err;
if (!lp->pdata) {
lp->pdata = devm_kzalloc(lp->dev,
sizeof(*lp->pdata), GFP_KERNEL);
if (!lp->pdata)
return -ENOMEM;
/* Setup defaults based on power-on defaults */
lp->pdata->name = NULL;
lp->pdata->initial_brightness = INIT_BRIGHT;
lp->pdata->leden = ARCXCNN_LEDEN_MASK;
lp->pdata->led_config_0 = i2c_smbus_read_byte_data(
lp->client, ARCXCNN_FADECTRL);
lp->pdata->led_config_1 = i2c_smbus_read_byte_data(
lp->client, ARCXCNN_ILED_CONFIG);
/* insure dim mode is not default pwm */
lp->pdata->led_config_1 |= ARCXCNN_ILED_DIM_INT;
lp->pdata->dim_freq = i2c_smbus_read_byte_data(
lp->client, ARCXCNN_DIMFREQ);
lp->pdata->comp_config = i2c_smbus_read_byte_data(
lp->client, ARCXCNN_COMP_CONFIG);
lp->pdata->filter_config = i2c_smbus_read_byte_data(
lp->client, ARCXCNN_FILT_CONFIG);
lp->pdata->trim_config = i2c_smbus_read_byte_data(
lp->client, ARCXCNN_IMAXTUNE);
if (IS_ENABLED(CONFIG_OF))
arcxcnn_parse_dt(lp);
}
i2c_set_clientdata(cl, lp);
/* constrain settings to what is possible */
if (lp->pdata->initial_brightness > MAX_BRIGHTNESS)
lp->pdata->initial_brightness = MAX_BRIGHTNESS;
/* set initial brightness */
ret = arcxcnn_set_brightness(lp, lp->pdata->initial_brightness);
if (ret)
goto probe_err;
/* set other register values directly */
ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_FADECTRL,
lp->pdata->led_config_0);
if (ret)
goto probe_err;
ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_ILED_CONFIG,
lp->pdata->led_config_1);
if (ret)
goto probe_err;
ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_DIMFREQ,
lp->pdata->dim_freq);
if (ret)
goto probe_err;
ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_COMP_CONFIG,
lp->pdata->comp_config);
if (ret)
goto probe_err;
ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_FILT_CONFIG,
lp->pdata->filter_config);
if (ret)
goto probe_err;
ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_IMAXTUNE,
lp->pdata->trim_config);
if (ret)
goto probe_err;
/* set initial LED Enables */
arcxcnn_update_field(lp, ARCXCNN_LEDEN,
ARCXCNN_LEDEN_MASK, lp->pdata->leden);
ret = arcxcnn_backlight_register(lp);
if (ret)
goto probe_register_err;
backlight_update_status(lp->bl);
return 0;
probe_register_err:
dev_err(lp->dev,
"failed to register backlight.\n");
probe_err:
dev_err(lp->dev,
"failure ret: %d\n", ret);
return ret;
}
static int arcxcnn_remove(struct i2c_client *cl)
{
struct arcxcnn *lp = i2c_get_clientdata(cl);
/* disable all strings (ignore errors) */
i2c_smbus_write_byte_data(lp->client,
ARCXCNN_LEDEN, 0x00);
/* reset the device (ignore errors) */
i2c_smbus_write_byte_data(lp->client,
ARCXCNN_CMD, ARCXCNN_CMD_RESET);
lp->bl->props.brightness = 0;
backlight_update_status(lp->bl);
return 0;
}
static const struct of_device_id arcxcnn_dt_ids[] = {
{ .compatible = "arc,arc2c0608" },
{ }
};
MODULE_DEVICE_TABLE(of, arcxcnn_dt_ids);
static const struct i2c_device_id arcxcnn_ids[] = {
{"arc2c0608", ARC2C0608},
{ }
};
MODULE_DEVICE_TABLE(i2c, arcxcnn_ids);
static struct i2c_driver arcxcnn_driver = {
.driver = {
.name = "arcxcnn_bl",
.of_match_table = of_match_ptr(arcxcnn_dt_ids),
},
.probe = arcxcnn_probe,
.remove = arcxcnn_remove,
.id_table = arcxcnn_ids,
};
module_i2c_driver(arcxcnn_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Brian Dodge <bdodge@arcticsand.com>");
MODULE_DESCRIPTION("ARCXCNN Backlight driver");
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