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https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
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4137d94fd8
Convert any entry of mutex lock/unlock to guard API and simplify code. With the use of guard API, handling for selttest functions can be greatly simplified. Suggested-by: Markus Elfring <Markus.Elfring@web.de> Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> Link: https://lore.kernel.org/r/20240626221520.2846-3-ansuelsmth@gmail.com Signed-off-by: Lee Jones <lee@kernel.org>
380 lines
10 KiB
C
380 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* lp5523.c - LP5523, LP55231 LED Driver
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*
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* Copyright (C) 2010 Nokia Corporation
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* Copyright (C) 2012 Texas Instruments
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*
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* Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
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* Milo(Woogyom) Kim <milo.kim@ti.com>
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*/
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#include <linux/cleanup.h>
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#include <linux/delay.h>
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#include <linux/firmware.h>
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#include <linux/i2c.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/platform_data/leds-lp55xx.h>
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#include <linux/slab.h>
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#include "leds-lp55xx-common.h"
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/* Memory is used like this:
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* 0x00 engine 1 program
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* 0x10 engine 2 program
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* 0x20 engine 3 program
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* 0x30 engine 1 muxing info
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* 0x40 engine 2 muxing info
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* 0x50 engine 3 muxing info
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*/
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#define LP5523_PAGES_PER_ENGINE 1
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#define LP5523_MAX_LEDS 9
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/* Registers */
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#define LP5523_REG_ENABLE 0x00
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#define LP5523_REG_OP_MODE 0x01
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#define LP5523_REG_ENABLE_LEDS_MSB 0x04
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#define LP5523_REG_ENABLE_LEDS_LSB 0x05
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#define LP5523_REG_LED_CTRL_BASE 0x06
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#define LP5523_REG_LED_PWM_BASE 0x16
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#define LP5523_REG_LED_CURRENT_BASE 0x26
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#define LP5523_REG_CONFIG 0x36
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#define LP5523_REG_STATUS 0x3A
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#define LP5523_ENGINE_BUSY BIT(4)
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#define LP5523_REG_RESET 0x3D
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#define LP5523_REG_LED_TEST_CTRL 0x41
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#define LP5523_REG_LED_TEST_ADC 0x42
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#define LP5523_REG_MASTER_FADER_BASE 0x48
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#define LP5523_REG_CH1_PROG_START 0x4C
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#define LP5523_REG_CH2_PROG_START 0x4D
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#define LP5523_REG_CH3_PROG_START 0x4E
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#define LP5523_REG_PROG_PAGE_SEL 0x4F
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#define LP5523_REG_PROG_MEM 0x50
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/* Bit description in registers */
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#define LP5523_ENABLE 0x40
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#define LP5523_AUTO_INC 0x40
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#define LP5523_PWR_SAVE 0x20
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#define LP5523_PWM_PWR_SAVE 0x04
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#define LP5523_CP_MODE_MASK 0x18
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#define LP5523_CP_MODE_SHIFT 3
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#define LP5523_AUTO_CLK 0x02
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#define LP5523_DEFAULT_CONFIG \
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(LP5523_AUTO_INC | LP5523_PWR_SAVE | LP5523_AUTO_CLK | LP5523_PWM_PWR_SAVE)
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#define LP5523_EN_LEDTEST 0x80
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#define LP5523_LEDTEST_DONE 0x80
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#define LP5523_RESET 0xFF
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#define LP5523_ADC_SHORTCIRC_LIM 80
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#define LP5523_EXT_CLK_USED 0x08
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#define LP5523_ENG_STATUS_MASK 0x07
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static int lp5523_init_program_engine(struct lp55xx_chip *chip);
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static int lp5523_post_init_device(struct lp55xx_chip *chip)
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{
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int ret;
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int val;
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ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
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if (ret)
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return ret;
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/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
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usleep_range(1000, 2000);
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val = LP5523_DEFAULT_CONFIG;
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val |= (chip->pdata->charge_pump_mode << LP5523_CP_MODE_SHIFT) & LP5523_CP_MODE_MASK;
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ret = lp55xx_write(chip, LP5523_REG_CONFIG, val);
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if (ret)
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return ret;
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/* turn on all leds */
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ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
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if (ret)
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return ret;
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ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
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if (ret)
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return ret;
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return lp5523_init_program_engine(chip);
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}
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static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
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{
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/* stop engine */
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if (!start) {
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lp55xx_stop_engine(chip);
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lp55xx_turn_off_channels(chip);
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return;
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}
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lp55xx_run_engine_common(chip);
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}
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static int lp5523_init_program_engine(struct lp55xx_chip *chip)
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{
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int i;
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int j;
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int ret;
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u8 status;
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/* one pattern per engine setting LED MUX start and stop addresses */
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static const u8 pattern[][LP55xx_BYTES_PER_PAGE] = {
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{ 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
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{ 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
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{ 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
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};
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/* hardcode 32 bytes of memory for each engine from program memory */
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ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00);
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if (ret)
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return ret;
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ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10);
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if (ret)
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return ret;
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ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20);
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if (ret)
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return ret;
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/* write LED MUX address space for each engine */
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for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
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chip->engine_idx = i;
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lp55xx_load_engine(chip);
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for (j = 0; j < LP55xx_BYTES_PER_PAGE; j++) {
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ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j,
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pattern[i - 1][j]);
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if (ret)
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goto out;
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}
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}
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lp5523_run_engine(chip, true);
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/* Let the programs run for couple of ms and check the engine status */
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usleep_range(3000, 6000);
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ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
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if (ret)
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goto out;
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status &= LP5523_ENG_STATUS_MASK;
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if (status != LP5523_ENG_STATUS_MASK) {
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dev_err(&chip->cl->dev,
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"could not configure LED engine, status = 0x%.2x\n",
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status);
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ret = -1;
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}
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out:
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lp55xx_stop_all_engine(chip);
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return ret;
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}
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static ssize_t lp5523_selftest(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
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struct lp55xx_chip *chip = led->chip;
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struct lp55xx_platform_data *pdata = chip->pdata;
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int ret, pos = 0;
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u8 status, adc, vdd, i;
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guard(mutex)(&chip->lock);
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ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
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if (ret < 0)
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return sysfs_emit(buf, "FAIL\n");
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/* Check that ext clock is really in use if requested */
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if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
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if ((status & LP5523_EXT_CLK_USED) == 0)
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return sysfs_emit(buf, "FAIL\n");
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}
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/* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
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lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
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usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
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ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
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if (ret < 0)
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return sysfs_emit(buf, "FAIL\n");
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if (!(status & LP5523_LEDTEST_DONE))
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usleep_range(3000, 6000); /* Was not ready. Wait little bit */
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ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
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if (ret < 0)
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return sysfs_emit(buf, "FAIL\n");
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vdd--; /* There may be some fluctuation in measurement */
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for (i = 0; i < pdata->num_channels; i++) {
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/* Skip disabled channels */
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if (pdata->led_config[i].led_current == 0)
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continue;
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/* Set default current */
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lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
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pdata->led_config[i].led_current);
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lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
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0xff);
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/* let current stabilize 2 - 4ms before measurements start */
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usleep_range(2000, 4000);
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lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL,
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LP5523_EN_LEDTEST | led->chan_nr);
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/* ADC conversion time is 2.7 ms typically */
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usleep_range(3000, 6000);
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ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
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if (ret < 0)
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return sysfs_emit(buf, "FAIL\n");
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if (!(status & LP5523_LEDTEST_DONE))
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usleep_range(3000, 6000); /* Was not ready. Wait. */
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ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
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if (ret < 0)
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return sysfs_emit(buf, "FAIL\n");
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if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
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pos += sysfs_emit_at(buf, pos, "LED %d FAIL\n",
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led->chan_nr);
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lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
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0x00);
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/* Restore current */
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lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
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led->led_current);
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led++;
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}
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return pos == 0 ? sysfs_emit(buf, "OK\n") : pos;
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}
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LP55XX_DEV_ATTR_ENGINE_MODE(1);
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LP55XX_DEV_ATTR_ENGINE_MODE(2);
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LP55XX_DEV_ATTR_ENGINE_MODE(3);
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LP55XX_DEV_ATTR_ENGINE_LEDS(1);
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LP55XX_DEV_ATTR_ENGINE_LEDS(2);
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LP55XX_DEV_ATTR_ENGINE_LEDS(3);
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LP55XX_DEV_ATTR_ENGINE_LOAD(1);
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LP55XX_DEV_ATTR_ENGINE_LOAD(2);
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LP55XX_DEV_ATTR_ENGINE_LOAD(3);
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static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
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LP55XX_DEV_ATTR_MASTER_FADER(1);
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LP55XX_DEV_ATTR_MASTER_FADER(2);
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LP55XX_DEV_ATTR_MASTER_FADER(3);
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static LP55XX_DEV_ATTR_RW(master_fader_leds, lp55xx_show_master_fader_leds,
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lp55xx_store_master_fader_leds);
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static struct attribute *lp5523_attributes[] = {
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&dev_attr_engine1_mode.attr,
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&dev_attr_engine2_mode.attr,
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&dev_attr_engine3_mode.attr,
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&dev_attr_engine1_load.attr,
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&dev_attr_engine2_load.attr,
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&dev_attr_engine3_load.attr,
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&dev_attr_engine1_leds.attr,
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&dev_attr_engine2_leds.attr,
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&dev_attr_engine3_leds.attr,
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&dev_attr_selftest.attr,
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&dev_attr_master_fader1.attr,
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&dev_attr_master_fader2.attr,
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&dev_attr_master_fader3.attr,
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&dev_attr_master_fader_leds.attr,
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NULL,
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};
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static const struct attribute_group lp5523_group = {
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.attrs = lp5523_attributes,
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};
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/* Chip specific configurations */
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static struct lp55xx_device_config lp5523_cfg = {
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.reg_op_mode = {
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.addr = LP5523_REG_OP_MODE,
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},
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.reg_exec = {
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.addr = LP5523_REG_ENABLE,
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},
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.engine_busy = {
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.addr = LP5523_REG_STATUS,
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.mask = LP5523_ENGINE_BUSY,
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},
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.reset = {
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.addr = LP5523_REG_RESET,
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.val = LP5523_RESET,
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},
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.enable = {
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.addr = LP5523_REG_ENABLE,
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.val = LP5523_ENABLE,
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},
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.prog_mem_base = {
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.addr = LP5523_REG_PROG_MEM,
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},
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.reg_led_pwm_base = {
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.addr = LP5523_REG_LED_PWM_BASE,
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},
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.reg_led_current_base = {
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.addr = LP5523_REG_LED_CURRENT_BASE,
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},
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.reg_master_fader_base = {
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.addr = LP5523_REG_MASTER_FADER_BASE,
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},
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.reg_led_ctrl_base = {
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.addr = LP5523_REG_LED_CTRL_BASE,
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},
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.pages_per_engine = LP5523_PAGES_PER_ENGINE,
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.max_channel = LP5523_MAX_LEDS,
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.post_init_device = lp5523_post_init_device,
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.brightness_fn = lp55xx_led_brightness,
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.multicolor_brightness_fn = lp55xx_multicolor_brightness,
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.set_led_current = lp55xx_set_led_current,
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.firmware_cb = lp55xx_firmware_loaded_cb,
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.run_engine = lp5523_run_engine,
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.dev_attr_group = &lp5523_group,
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};
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static const struct i2c_device_id lp5523_id[] = {
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{ "lp5523", .driver_data = (kernel_ulong_t)&lp5523_cfg, },
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{ "lp55231", .driver_data = (kernel_ulong_t)&lp5523_cfg, },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lp5523_id);
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static const struct of_device_id of_lp5523_leds_match[] = {
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{ .compatible = "national,lp5523", .data = &lp5523_cfg, },
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{ .compatible = "ti,lp55231", .data = &lp5523_cfg, },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_lp5523_leds_match);
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static struct i2c_driver lp5523_driver = {
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.driver = {
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.name = "lp5523x",
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.of_match_table = of_lp5523_leds_match,
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},
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.probe = lp55xx_probe,
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.remove = lp55xx_remove,
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.id_table = lp5523_id,
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};
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module_i2c_driver(lp5523_driver);
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MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
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MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
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MODULE_DESCRIPTION("LP5523 LED engine");
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MODULE_LICENSE("GPL");
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