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.
153 lines
3.8 KiB
153 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
// Copyright 2015 Texas Instruments |
|
// Copyright 2018 Sebastian Reichel |
|
// Copyright 2018 Pavel Machek <[email protected]> |
|
// TI LMU LED common framework, based on previous work from |
|
// Milo Kim <[email protected]> |
|
|
|
#include <linux/bitops.h> |
|
#include <linux/err.h> |
|
#include <linux/of_device.h> |
|
|
|
#include <linux/leds-ti-lmu-common.h> |
|
|
|
static const unsigned int ramp_table[16] = {2048, 262000, 524000, 1049000, |
|
2090000, 4194000, 8389000, 16780000, 33550000, |
|
41940000, 50330000, 58720000, 67110000, |
|
83880000, 100660000, 117440000}; |
|
|
|
static int ti_lmu_common_update_brightness(struct ti_lmu_bank *lmu_bank, |
|
int brightness) |
|
{ |
|
struct regmap *regmap = lmu_bank->regmap; |
|
u8 reg, val; |
|
int ret; |
|
|
|
/* |
|
* Brightness register update |
|
* |
|
* 11 bit dimming: update LSB bits and write MSB byte. |
|
* MSB brightness should be shifted. |
|
* 8 bit dimming: write MSB byte. |
|
*/ |
|
if (lmu_bank->max_brightness == MAX_BRIGHTNESS_11BIT) { |
|
reg = lmu_bank->lsb_brightness_reg; |
|
ret = regmap_update_bits(regmap, reg, |
|
LMU_11BIT_LSB_MASK, |
|
brightness); |
|
if (ret) |
|
return ret; |
|
|
|
val = brightness >> LMU_11BIT_MSB_SHIFT; |
|
} else { |
|
val = brightness; |
|
} |
|
|
|
reg = lmu_bank->msb_brightness_reg; |
|
|
|
return regmap_write(regmap, reg, val); |
|
} |
|
|
|
int ti_lmu_common_set_brightness(struct ti_lmu_bank *lmu_bank, int brightness) |
|
{ |
|
return ti_lmu_common_update_brightness(lmu_bank, brightness); |
|
} |
|
EXPORT_SYMBOL(ti_lmu_common_set_brightness); |
|
|
|
static unsigned int ti_lmu_common_convert_ramp_to_index(unsigned int usec) |
|
{ |
|
int size = ARRAY_SIZE(ramp_table); |
|
int i; |
|
|
|
if (usec <= ramp_table[0]) |
|
return 0; |
|
|
|
if (usec > ramp_table[size - 1]) |
|
return size - 1; |
|
|
|
for (i = 1; i < size; i++) { |
|
if (usec == ramp_table[i]) |
|
return i; |
|
|
|
/* Find an approximate index by looking up the table */ |
|
if (usec > ramp_table[i - 1] && usec < ramp_table[i]) { |
|
if (usec - ramp_table[i - 1] < ramp_table[i] - usec) |
|
return i - 1; |
|
else |
|
return i; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
int ti_lmu_common_set_ramp(struct ti_lmu_bank *lmu_bank) |
|
{ |
|
struct regmap *regmap = lmu_bank->regmap; |
|
u8 ramp, ramp_up, ramp_down; |
|
|
|
if (lmu_bank->ramp_up_usec == 0 && lmu_bank->ramp_down_usec == 0) { |
|
ramp_up = 0; |
|
ramp_down = 0; |
|
} else { |
|
ramp_up = ti_lmu_common_convert_ramp_to_index(lmu_bank->ramp_up_usec); |
|
ramp_down = ti_lmu_common_convert_ramp_to_index(lmu_bank->ramp_down_usec); |
|
} |
|
|
|
ramp = (ramp_up << 4) | ramp_down; |
|
|
|
return regmap_write(regmap, lmu_bank->runtime_ramp_reg, ramp); |
|
|
|
} |
|
EXPORT_SYMBOL(ti_lmu_common_set_ramp); |
|
|
|
int ti_lmu_common_get_ramp_params(struct device *dev, |
|
struct fwnode_handle *child, |
|
struct ti_lmu_bank *lmu_data) |
|
{ |
|
int ret; |
|
|
|
ret = fwnode_property_read_u32(child, "ramp-up-us", |
|
&lmu_data->ramp_up_usec); |
|
if (ret) |
|
dev_warn(dev, "ramp-up-us property missing\n"); |
|
|
|
|
|
ret = fwnode_property_read_u32(child, "ramp-down-us", |
|
&lmu_data->ramp_down_usec); |
|
if (ret) |
|
dev_warn(dev, "ramp-down-us property missing\n"); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(ti_lmu_common_get_ramp_params); |
|
|
|
int ti_lmu_common_get_brt_res(struct device *dev, struct fwnode_handle *child, |
|
struct ti_lmu_bank *lmu_data) |
|
{ |
|
int ret; |
|
|
|
ret = device_property_read_u32(dev, "ti,brightness-resolution", |
|
&lmu_data->max_brightness); |
|
if (ret) |
|
ret = fwnode_property_read_u32(child, |
|
"ti,brightness-resolution", |
|
&lmu_data->max_brightness); |
|
if (lmu_data->max_brightness <= 0) { |
|
lmu_data->max_brightness = MAX_BRIGHTNESS_8BIT; |
|
return ret; |
|
} |
|
|
|
if (lmu_data->max_brightness > MAX_BRIGHTNESS_11BIT) |
|
lmu_data->max_brightness = MAX_BRIGHTNESS_11BIT; |
|
|
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(ti_lmu_common_get_brt_res); |
|
|
|
MODULE_DESCRIPTION("TI LMU common LED framework"); |
|
MODULE_AUTHOR("Sebastian Reichel"); |
|
MODULE_AUTHOR("Dan Murphy <[email protected]>"); |
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_ALIAS("ti-lmu-led-common");
|
|
|