595 lines
15 KiB
C
595 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Awinic AW20036/AW20054/AW20072 LED driver
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*
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* Copyright (c) 2023, SberDevices. All Rights Reserved.
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*
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* Author: Martin Kurbanov <mmkurbanov@sberdevices.ru>
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*/
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#include <linux/bitfield.h>
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#include <linux/bits.h>
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#include <linux/container_of.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/regmap.h>
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#include <linux/time.h>
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#include <linux/units.h>
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#define AW200XX_DIM_MAX (BIT(6) - 1)
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#define AW200XX_FADE_MAX (BIT(8) - 1)
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#define AW200XX_IMAX_DEFAULT_uA 60000
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#define AW200XX_IMAX_MAX_uA 160000
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#define AW200XX_IMAX_MIN_uA 3300
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/* Page 0 */
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#define AW200XX_REG_PAGE0_BASE 0xc000
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/* Select page register */
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#define AW200XX_REG_PAGE 0xF0
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#define AW200XX_PAGE_MASK (GENMASK(7, 6) | GENMASK(2, 0))
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#define AW200XX_PAGE_SHIFT 0
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#define AW200XX_NUM_PAGES 6
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#define AW200XX_PAGE_SIZE 256
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#define AW200XX_REG(page, reg) \
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(AW200XX_REG_PAGE0_BASE + (page) * AW200XX_PAGE_SIZE + (reg))
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#define AW200XX_REG_MAX \
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AW200XX_REG(AW200XX_NUM_PAGES - 1, AW200XX_PAGE_SIZE - 1)
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#define AW200XX_PAGE0 0
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#define AW200XX_PAGE1 1
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#define AW200XX_PAGE2 2
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#define AW200XX_PAGE3 3
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#define AW200XX_PAGE4 4
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#define AW200XX_PAGE5 5
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/* Chip ID register */
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#define AW200XX_REG_IDR AW200XX_REG(AW200XX_PAGE0, 0x00)
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#define AW200XX_IDR_CHIPID 0x18
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/* Sleep mode register */
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#define AW200XX_REG_SLPCR AW200XX_REG(AW200XX_PAGE0, 0x01)
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#define AW200XX_SLPCR_ACTIVE 0x00
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/* Reset register */
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#define AW200XX_REG_RSTR AW200XX_REG(AW200XX_PAGE0, 0x02)
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#define AW200XX_RSTR_RESET 0x01
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/* Global current configuration register */
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#define AW200XX_REG_GCCR AW200XX_REG(AW200XX_PAGE0, 0x03)
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#define AW200XX_GCCR_IMAX_MASK GENMASK(7, 4)
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#define AW200XX_GCCR_IMAX(x) ((x) << 4)
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#define AW200XX_GCCR_ALLON BIT(3)
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/* Fast clear display control register */
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#define AW200XX_REG_FCD AW200XX_REG(AW200XX_PAGE0, 0x04)
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#define AW200XX_FCD_CLEAR 0x01
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/* Display size configuration */
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#define AW200XX_REG_DSIZE AW200XX_REG(AW200XX_PAGE0, 0x80)
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#define AW200XX_DSIZE_COLUMNS_MAX 12
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#define AW200XX_LED2REG(x, columns) \
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((x) + (((x) / (columns)) * (AW200XX_DSIZE_COLUMNS_MAX - (columns))))
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/*
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* DIM current configuration register (page 4).
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* The even address for current DIM configuration.
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* The odd address for current FADE configuration
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*/
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#define AW200XX_REG_DIM(x, columns) \
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AW200XX_REG(AW200XX_PAGE4, AW200XX_LED2REG(x, columns) * 2)
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#define AW200XX_REG_DIM2FADE(x) ((x) + 1)
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/*
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* Duty ratio of display scan (see p.15 of datasheet for formula):
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* duty = (592us / 600.5us) * (1 / (display_rows + 1))
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*
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* Multiply to 1000 (MILLI) to improve the accuracy of calculations.
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*/
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#define AW200XX_DUTY_RATIO(rows) \
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(((592UL * USEC_PER_SEC) / 600500UL) * (MILLI / (rows)) / MILLI)
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struct aw200xx_chipdef {
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u32 channels;
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u32 display_size_rows_max;
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u32 display_size_columns;
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};
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struct aw200xx_led {
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struct led_classdev cdev;
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struct aw200xx *chip;
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int dim;
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u32 num;
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};
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struct aw200xx {
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const struct aw200xx_chipdef *cdef;
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struct i2c_client *client;
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struct regmap *regmap;
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struct mutex mutex;
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u32 num_leds;
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u32 display_rows;
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struct aw200xx_led leds[];
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};
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static ssize_t dim_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct led_classdev *cdev = dev_get_drvdata(dev);
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struct aw200xx_led *led = container_of(cdev, struct aw200xx_led, cdev);
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int dim = led->dim;
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if (dim < 0)
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return sysfs_emit(buf, "auto\n");
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return sysfs_emit(buf, "%d\n", dim);
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}
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static ssize_t dim_store(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct led_classdev *cdev = dev_get_drvdata(dev);
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struct aw200xx_led *led = container_of(cdev, struct aw200xx_led, cdev);
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struct aw200xx *chip = led->chip;
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u32 columns = chip->cdef->display_size_columns;
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int dim;
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ssize_t ret;
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if (sysfs_streq(buf, "auto")) {
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dim = -1;
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} else {
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ret = kstrtoint(buf, 0, &dim);
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if (ret)
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return ret;
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if (dim > AW200XX_DIM_MAX)
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return -EINVAL;
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}
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mutex_lock(&chip->mutex);
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if (dim >= 0) {
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ret = regmap_write(chip->regmap,
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AW200XX_REG_DIM(led->num, columns), dim);
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if (ret)
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goto out_unlock;
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}
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led->dim = dim;
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ret = count;
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out_unlock:
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mutex_unlock(&chip->mutex);
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return ret;
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}
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static DEVICE_ATTR_RW(dim);
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static struct attribute *dim_attrs[] = {
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&dev_attr_dim.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(dim);
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static int aw200xx_brightness_set(struct led_classdev *cdev,
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enum led_brightness brightness)
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{
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struct aw200xx_led *led = container_of(cdev, struct aw200xx_led, cdev);
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struct aw200xx *chip = led->chip;
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int dim;
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u32 reg;
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int ret;
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mutex_lock(&chip->mutex);
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reg = AW200XX_REG_DIM(led->num, chip->cdef->display_size_columns);
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dim = led->dim;
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if (dim < 0)
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dim = max_t(int,
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brightness / (AW200XX_FADE_MAX / AW200XX_DIM_MAX),
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1);
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ret = regmap_write(chip->regmap, reg, dim);
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if (ret)
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goto out_unlock;
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ret = regmap_write(chip->regmap,
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AW200XX_REG_DIM2FADE(reg), brightness);
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out_unlock:
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mutex_unlock(&chip->mutex);
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return ret;
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}
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static u32 aw200xx_imax_from_global(const struct aw200xx *const chip,
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u32 global_imax_uA)
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{
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u64 led_imax_uA;
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/*
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* The output current of each LED (see p.14 of datasheet for formula):
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* Iled = Imax * (dim / 63) * ((fade + 1) / 256) * duty
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*
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* The value of duty is determined by the following formula:
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* duty = (592us / 600.5us) * (1 / (display_rows + 1))
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*
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* Calculated for the maximum values of fade and dim.
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* We divide by 1000 because we earlier multiplied by 1000 to improve
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* accuracy when calculating the duty.
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*/
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led_imax_uA = global_imax_uA * AW200XX_DUTY_RATIO(chip->display_rows);
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do_div(led_imax_uA, MILLI);
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return led_imax_uA;
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}
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static u32 aw200xx_imax_to_global(const struct aw200xx *const chip,
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u32 led_imax_uA)
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{
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u32 duty = AW200XX_DUTY_RATIO(chip->display_rows);
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/* The output current of each LED (see p.14 of datasheet for formula) */
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return (led_imax_uA * 1000U) / duty;
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}
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#define AW200XX_IMAX_MULTIPLIER1 10000
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#define AW200XX_IMAX_MULTIPLIER2 3333
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#define AW200XX_IMAX_BASE_VAL1 0
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#define AW200XX_IMAX_BASE_VAL2 8
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/*
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* The AW200XX has a 4-bit register (GCCR) to configure the global current,
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* which ranges from 3.3mA to 160mA. The following table indicates the values
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* of the global current, divided into two parts:
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*
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* +-----------+-----------------+-----------+-----------------+
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* | reg value | global max (mA) | reg value | global max (mA) |
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* +-----------+-----------------+-----------+-----------------+
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* | 0 | 10 | 8 | 3.3 |
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* | 1 | 20 | 9 | 6.7 |
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* | 2 | 30 | 10 | 10 |
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* | 3 | 40 | 11 | 13.3 |
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* | 4 | 60 | 12 | 20 |
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* | 5 | 80 | 13 | 26.7 |
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* | 6 | 120 | 14 | 40 |
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* | 7 | 160 | 15 | 53.3 |
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* +-----------+-----------------+-----------+-----------------+
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*
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* The left part with a multiplier of 10, and the right part with a multiplier
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* of 3.3.
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* So we have two formulas to calculate the global current:
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* for the left part of the table:
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* imax = coefficient * 10
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*
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* for the right part of the table:
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* imax = coefficient * 3.3
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*
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* The coefficient table consists of the following values:
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* 1, 2, 3, 4, 6, 8, 12, 16.
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*/
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static int aw200xx_set_imax(const struct aw200xx *const chip,
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u32 led_imax_uA)
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{
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u32 g_imax_uA = aw200xx_imax_to_global(chip, led_imax_uA);
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u32 coeff_table[] = {1, 2, 3, 4, 6, 8, 12, 16};
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u32 gccr_imax = UINT_MAX;
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u32 cur_imax = 0;
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int i;
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for (i = 0; i < ARRAY_SIZE(coeff_table); i++) {
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u32 imax;
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/* select closest ones */
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imax = coeff_table[i] * AW200XX_IMAX_MULTIPLIER1;
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if (g_imax_uA >= imax && imax > cur_imax) {
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cur_imax = imax;
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gccr_imax = i + AW200XX_IMAX_BASE_VAL1;
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}
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imax = coeff_table[i] * AW200XX_IMAX_MULTIPLIER2;
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imax = DIV_ROUND_CLOSEST(imax, 100) * 100;
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if (g_imax_uA >= imax && imax > cur_imax) {
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cur_imax = imax;
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gccr_imax = i + AW200XX_IMAX_BASE_VAL2;
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}
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}
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if (gccr_imax == UINT_MAX)
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return -EINVAL;
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return regmap_update_bits(chip->regmap, AW200XX_REG_GCCR,
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AW200XX_GCCR_IMAX_MASK,
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AW200XX_GCCR_IMAX(gccr_imax));
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}
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static int aw200xx_chip_reset(const struct aw200xx *const chip)
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{
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int ret;
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ret = regmap_write(chip->regmap, AW200XX_REG_RSTR, AW200XX_RSTR_RESET);
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if (ret)
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return ret;
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regcache_mark_dirty(chip->regmap);
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return regmap_write(chip->regmap, AW200XX_REG_FCD, AW200XX_FCD_CLEAR);
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}
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static int aw200xx_chip_init(const struct aw200xx *const chip)
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{
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int ret;
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ret = regmap_write(chip->regmap, AW200XX_REG_DSIZE,
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chip->display_rows - 1);
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if (ret)
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return ret;
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ret = regmap_write(chip->regmap, AW200XX_REG_SLPCR,
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AW200XX_SLPCR_ACTIVE);
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if (ret)
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return ret;
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return regmap_update_bits(chip->regmap, AW200XX_REG_GCCR,
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AW200XX_GCCR_ALLON, AW200XX_GCCR_ALLON);
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}
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static int aw200xx_chip_check(const struct aw200xx *const chip)
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{
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struct device *dev = &chip->client->dev;
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u32 chipid;
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int ret;
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ret = regmap_read(chip->regmap, AW200XX_REG_IDR, &chipid);
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if (ret)
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return dev_err_probe(dev, ret, "Failed to read chip ID\n");
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if (chipid != AW200XX_IDR_CHIPID)
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return dev_err_probe(dev, -ENODEV,
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"Chip reported wrong ID: %x\n", chipid);
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return 0;
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}
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static int aw200xx_probe_fw(struct device *dev, struct aw200xx *chip)
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{
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struct fwnode_handle *child;
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u32 current_min, current_max, min_uA;
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int ret;
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int i;
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ret = device_property_read_u32(dev, "awinic,display-rows",
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&chip->display_rows);
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if (ret)
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return dev_err_probe(dev, ret,
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"Failed to read 'display-rows' property\n");
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if (!chip->display_rows ||
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chip->display_rows > chip->cdef->display_size_rows_max) {
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return dev_err_probe(dev, -EINVAL,
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"Invalid leds display size %u\n",
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chip->display_rows);
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}
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current_max = aw200xx_imax_from_global(chip, AW200XX_IMAX_MAX_uA);
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current_min = aw200xx_imax_from_global(chip, AW200XX_IMAX_MIN_uA);
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min_uA = UINT_MAX;
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i = 0;
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device_for_each_child_node(dev, child) {
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struct led_init_data init_data = {};
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struct aw200xx_led *led;
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u32 source, imax;
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ret = fwnode_property_read_u32(child, "reg", &source);
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if (ret) {
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dev_err(dev, "Missing reg property\n");
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chip->num_leds--;
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continue;
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}
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if (source >= chip->cdef->channels) {
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dev_err(dev, "LED reg %u out of range (max %u)\n",
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source, chip->cdef->channels);
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chip->num_leds--;
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continue;
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}
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ret = fwnode_property_read_u32(child, "led-max-microamp",
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&imax);
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if (ret) {
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dev_info(&chip->client->dev,
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"DT property led-max-microamp is missing\n");
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} else if (imax < current_min || imax > current_max) {
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dev_err(dev, "Invalid value %u for led-max-microamp\n",
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imax);
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chip->num_leds--;
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continue;
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} else {
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min_uA = min(min_uA, imax);
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}
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led = &chip->leds[i];
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led->dim = -1;
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led->num = source;
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led->chip = chip;
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led->cdev.brightness_set_blocking = aw200xx_brightness_set;
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led->cdev.groups = dim_groups;
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init_data.fwnode = child;
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ret = devm_led_classdev_register_ext(dev, &led->cdev,
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&init_data);
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if (ret) {
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fwnode_handle_put(child);
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break;
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}
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i++;
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}
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if (!chip->num_leds)
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return -EINVAL;
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if (min_uA == UINT_MAX) {
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min_uA = aw200xx_imax_from_global(chip,
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AW200XX_IMAX_DEFAULT_uA);
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}
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return aw200xx_set_imax(chip, min_uA);
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}
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static const struct regmap_range_cfg aw200xx_ranges[] = {
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{
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.name = "aw200xx",
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.range_min = 0,
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.range_max = AW200XX_REG_MAX,
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.selector_reg = AW200XX_REG_PAGE,
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.selector_mask = AW200XX_PAGE_MASK,
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.selector_shift = AW200XX_PAGE_SHIFT,
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.window_start = 0,
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.window_len = AW200XX_PAGE_SIZE,
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},
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};
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static const struct regmap_range aw200xx_writeonly_ranges[] = {
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regmap_reg_range(AW200XX_REG(AW200XX_PAGE1, 0x00), AW200XX_REG_MAX),
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};
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static const struct regmap_access_table aw200xx_readable_table = {
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.no_ranges = aw200xx_writeonly_ranges,
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.n_no_ranges = ARRAY_SIZE(aw200xx_writeonly_ranges),
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};
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static const struct regmap_range aw200xx_readonly_ranges[] = {
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regmap_reg_range(AW200XX_REG_IDR, AW200XX_REG_IDR),
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};
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static const struct regmap_access_table aw200xx_writeable_table = {
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.no_ranges = aw200xx_readonly_ranges,
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.n_no_ranges = ARRAY_SIZE(aw200xx_readonly_ranges),
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};
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static const struct regmap_config aw200xx_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = AW200XX_REG_MAX,
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.ranges = aw200xx_ranges,
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.num_ranges = ARRAY_SIZE(aw200xx_ranges),
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.rd_table = &aw200xx_readable_table,
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.wr_table = &aw200xx_writeable_table,
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.cache_type = REGCACHE_RBTREE,
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};
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static int aw200xx_probe(struct i2c_client *client)
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{
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const struct aw200xx_chipdef *cdef;
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struct aw200xx *chip;
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int count;
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int ret;
|
|
|
|
cdef = device_get_match_data(&client->dev);
|
|
if (!cdef)
|
|
return -ENODEV;
|
|
|
|
count = device_get_child_node_count(&client->dev);
|
|
if (!count || count > cdef->channels)
|
|
return dev_err_probe(&client->dev, -EINVAL,
|
|
"Incorrect number of leds (%d)", count);
|
|
|
|
chip = devm_kzalloc(&client->dev, struct_size(chip, leds, count),
|
|
GFP_KERNEL);
|
|
if (!chip)
|
|
return -ENOMEM;
|
|
|
|
chip->cdef = cdef;
|
|
chip->num_leds = count;
|
|
chip->client = client;
|
|
i2c_set_clientdata(client, chip);
|
|
|
|
chip->regmap = devm_regmap_init_i2c(client, &aw200xx_regmap_config);
|
|
if (IS_ERR(chip->regmap))
|
|
return PTR_ERR(chip->regmap);
|
|
|
|
ret = aw200xx_chip_check(chip);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mutex_init(&chip->mutex);
|
|
|
|
/* Need a lock now since after call aw200xx_probe_fw, sysfs nodes created */
|
|
mutex_lock(&chip->mutex);
|
|
|
|
ret = aw200xx_chip_reset(chip);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
ret = aw200xx_probe_fw(&client->dev, chip);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
ret = aw200xx_chip_init(chip);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&chip->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void aw200xx_remove(struct i2c_client *client)
|
|
{
|
|
struct aw200xx *chip = i2c_get_clientdata(client);
|
|
|
|
aw200xx_chip_reset(chip);
|
|
mutex_destroy(&chip->mutex);
|
|
}
|
|
|
|
static const struct aw200xx_chipdef aw20036_cdef = {
|
|
.channels = 36,
|
|
.display_size_rows_max = 3,
|
|
.display_size_columns = 12,
|
|
};
|
|
|
|
static const struct aw200xx_chipdef aw20054_cdef = {
|
|
.channels = 54,
|
|
.display_size_rows_max = 6,
|
|
.display_size_columns = 9,
|
|
};
|
|
|
|
static const struct aw200xx_chipdef aw20072_cdef = {
|
|
.channels = 72,
|
|
.display_size_rows_max = 6,
|
|
.display_size_columns = 12,
|
|
};
|
|
|
|
static const struct i2c_device_id aw200xx_id[] = {
|
|
{ "aw20036" },
|
|
{ "aw20054" },
|
|
{ "aw20072" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, aw200xx_id);
|
|
|
|
static const struct of_device_id aw200xx_match_table[] = {
|
|
{ .compatible = "awinic,aw20036", .data = &aw20036_cdef, },
|
|
{ .compatible = "awinic,aw20054", .data = &aw20054_cdef, },
|
|
{ .compatible = "awinic,aw20072", .data = &aw20072_cdef, },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, aw200xx_match_table);
|
|
|
|
static struct i2c_driver aw200xx_driver = {
|
|
.driver = {
|
|
.name = "aw200xx",
|
|
.of_match_table = aw200xx_match_table,
|
|
},
|
|
.probe_new = aw200xx_probe,
|
|
.remove = aw200xx_remove,
|
|
.id_table = aw200xx_id,
|
|
};
|
|
module_i2c_driver(aw200xx_driver);
|
|
|
|
MODULE_AUTHOR("Martin Kurbanov <mmkurbanov@sberdevices.ru>");
|
|
MODULE_DESCRIPTION("AW200XX LED driver");
|
|
MODULE_LICENSE("GPL");
|