forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
408 lines
11 KiB
408 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Backlight driver for ArcticSand ARC_X_C_0N_0N Devices |
|
* |
|
* Copyright 2016 ArcticSand, Inc. |
|
* Author : Brian Dodge <[email protected]> |
|
*/ |
|
|
|
#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 <[email protected]>"); |
|
MODULE_DESCRIPTION("ARCXCNN Backlight driver");
|
|
|