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linux/drivers/leds/leds-lp5523.c
Christian Marangi 4137d94fd8 leds: leds-lp55xx: Convert mutex lock/unlock to guard API 
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>
2024-07-11 12:46:25 +01:00

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