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3192f14124
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20230714174651.4058753-1-robh@kernel.org Signed-off-by: Lee Jones <lee@kernel.org>
153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright 2015 Texas Instruments
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// Copyright 2018 Sebastian Reichel
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// Copyright 2018 Pavel Machek <pavel@ucw.cz>
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// TI LMU LED common framework, based on previous work from
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// Milo Kim <milo.kim@ti.com>
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#include <linux/bitops.h>
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#include <linux/err.h>
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#include <linux/property.h>
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#include <linux/leds-ti-lmu-common.h>
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static const unsigned int ramp_table[16] = {2048, 262000, 524000, 1049000,
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2090000, 4194000, 8389000, 16780000, 33550000,
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41940000, 50330000, 58720000, 67110000,
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83880000, 100660000, 117440000};
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static int ti_lmu_common_update_brightness(struct ti_lmu_bank *lmu_bank,
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int brightness)
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{
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struct regmap *regmap = lmu_bank->regmap;
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u8 reg, val;
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int ret;
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/*
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* Brightness register update
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*
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* 11 bit dimming: update LSB bits and write MSB byte.
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* MSB brightness should be shifted.
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* 8 bit dimming: write MSB byte.
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*/
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if (lmu_bank->max_brightness == MAX_BRIGHTNESS_11BIT) {
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reg = lmu_bank->lsb_brightness_reg;
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ret = regmap_update_bits(regmap, reg,
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LMU_11BIT_LSB_MASK,
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brightness);
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if (ret)
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return ret;
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val = brightness >> LMU_11BIT_MSB_SHIFT;
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} else {
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val = brightness;
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}
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reg = lmu_bank->msb_brightness_reg;
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return regmap_write(regmap, reg, val);
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}
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int ti_lmu_common_set_brightness(struct ti_lmu_bank *lmu_bank, int brightness)
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{
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return ti_lmu_common_update_brightness(lmu_bank, brightness);
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}
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EXPORT_SYMBOL(ti_lmu_common_set_brightness);
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static unsigned int ti_lmu_common_convert_ramp_to_index(unsigned int usec)
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{
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int size = ARRAY_SIZE(ramp_table);
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int i;
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if (usec <= ramp_table[0])
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return 0;
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if (usec > ramp_table[size - 1])
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return size - 1;
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for (i = 1; i < size; i++) {
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if (usec == ramp_table[i])
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return i;
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/* Find an approximate index by looking up the table */
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if (usec > ramp_table[i - 1] && usec < ramp_table[i]) {
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if (usec - ramp_table[i - 1] < ramp_table[i] - usec)
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return i - 1;
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else
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return i;
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}
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}
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return 0;
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}
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int ti_lmu_common_set_ramp(struct ti_lmu_bank *lmu_bank)
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{
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struct regmap *regmap = lmu_bank->regmap;
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u8 ramp, ramp_up, ramp_down;
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if (lmu_bank->ramp_up_usec == 0 && lmu_bank->ramp_down_usec == 0) {
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ramp_up = 0;
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ramp_down = 0;
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} else {
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ramp_up = ti_lmu_common_convert_ramp_to_index(lmu_bank->ramp_up_usec);
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ramp_down = ti_lmu_common_convert_ramp_to_index(lmu_bank->ramp_down_usec);
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}
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ramp = (ramp_up << 4) | ramp_down;
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return regmap_write(regmap, lmu_bank->runtime_ramp_reg, ramp);
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}
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EXPORT_SYMBOL(ti_lmu_common_set_ramp);
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int ti_lmu_common_get_ramp_params(struct device *dev,
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struct fwnode_handle *child,
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struct ti_lmu_bank *lmu_data)
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{
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int ret;
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ret = fwnode_property_read_u32(child, "ramp-up-us",
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&lmu_data->ramp_up_usec);
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if (ret)
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dev_warn(dev, "ramp-up-us property missing\n");
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ret = fwnode_property_read_u32(child, "ramp-down-us",
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&lmu_data->ramp_down_usec);
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if (ret)
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dev_warn(dev, "ramp-down-us property missing\n");
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return 0;
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}
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EXPORT_SYMBOL(ti_lmu_common_get_ramp_params);
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int ti_lmu_common_get_brt_res(struct device *dev, struct fwnode_handle *child,
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struct ti_lmu_bank *lmu_data)
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{
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int ret;
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ret = device_property_read_u32(dev, "ti,brightness-resolution",
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&lmu_data->max_brightness);
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if (ret)
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ret = fwnode_property_read_u32(child,
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"ti,brightness-resolution",
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&lmu_data->max_brightness);
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if (lmu_data->max_brightness <= 0) {
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lmu_data->max_brightness = MAX_BRIGHTNESS_8BIT;
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return ret;
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}
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if (lmu_data->max_brightness > MAX_BRIGHTNESS_11BIT)
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lmu_data->max_brightness = MAX_BRIGHTNESS_11BIT;
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return 0;
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}
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EXPORT_SYMBOL(ti_lmu_common_get_brt_res);
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MODULE_DESCRIPTION("TI LMU common LED framework");
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MODULE_AUTHOR("Sebastian Reichel");
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MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("ti-lmu-led-common");
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