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leds: leds-lp55xx: Generalize stop_all_engine OP

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In all the lp55xx based driver, we have a similar implementation of the
stop_all_engine function with the only difference of the required sleep
for the OP MODE change.

The main difference is legacy LEDs require a min of 152 us while new one
use a generic 1-2ms. The new one use a 1-2ms sleep as suggested in the
datasheet IN ALTERNATIVE to a much more robust approach by using the
newly introduced ENGINE_BUSY bit in the STATUS reg.

To better handle sleep after OP MODE change, add support for polling the
ENGINE_BUSY bit and use the legacy sleep for old LEDs.

With this change, stop_all_engine can be generalized and moved to
lp55xx-common.

To make more clear the double usage of lp55xx_reg, define a union for
additional scope of mask and shift.

Update all lp55xx based driver to use the new generalized function and
define the required bits in the device_config struct.

Suggested-by: Lee Jones <lee@kernel.org>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Link: https://lore.kernel.org/r/20240626160027.19703-4-ansuelsmth@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Christian Marangi 2024-06-26 18:00:08 +02:00 committed by Lee Jones
parent a6ca48430d
commit a9b202b9cf
6 changed files with 84 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/leds/leds-lp5521.c
View File

@ -135,12 +135,6 @@ static void lp5521_load_engine(struct lp55xx_chip *chip)
lp5521_wait_opmode_done();
}
static void lp5521_stop_all_engines(struct lp55xx_chip *chip)
{
lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
lp5521_wait_opmode_done();
}
static void lp5521_stop_engine(struct lp55xx_chip *chip)
{
enum lp55xx_engine_index idx = chip->engine_idx;
@ -499,6 +493,9 @@ static const struct attribute_group lp5521_group = {
/* Chip specific configurations */
static struct lp55xx_device_config lp5521_cfg = {
.reg_op_mode = {
.addr = LP5521_REG_OP_MODE,
},
.reset = {
.addr = LP5521_REG_RESET,
.val = LP5521_RESET,
@ -585,7 +582,7 @@ static void lp5521_remove(struct i2c_client *client)
struct lp55xx_led *led = i2c_get_clientdata(client);
struct lp55xx_chip *chip = led->chip;
lp5521_stop_all_engines(chip);
lp55xx_stop_all_engine(chip);
lp55xx_unregister_sysfs(chip);
lp55xx_deinit_device(chip);
}

20
drivers/leds/leds-lp5523.c
View File

@ -41,7 +41,10 @@
#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
@ -190,12 +193,6 @@ static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip)
lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
}
static void lp5523_stop_all_engines(struct lp55xx_chip *chip)
{
lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
lp5523_wait_opmode_done();
}
static void lp5523_stop_engine(struct lp55xx_chip *chip)
{
enum lp55xx_engine_index idx = chip->engine_idx;
@ -322,7 +319,7 @@ static int lp5523_init_program_engine(struct lp55xx_chip *chip)
}
out:
lp5523_stop_all_engines(chip);
lp55xx_stop_all_engine(chip);
return ret;
}
@ -873,6 +870,13 @@ static const struct attribute_group lp5523_group = {
/* Chip specific configurations */
static struct lp55xx_device_config lp5523_cfg = {
.reg_op_mode = {
.addr = LP5523_REG_OP_MODE,
},
.engine_busy = {
.addr = LP5523_REG_STATUS,
.mask = LP5523_ENGINE_BUSY,
},
.reset = {
.addr = LP5523_REG_RESET,
.val = LP5523_RESET,
@ -959,7 +963,7 @@ static void lp5523_remove(struct i2c_client *client)
struct lp55xx_led *led = i2c_get_clientdata(client);
struct lp55xx_chip *chip = led->chip;
lp5523_stop_all_engines(chip);
lp55xx_stop_all_engine(chip);
lp55xx_unregister_sysfs(chip);
lp55xx_deinit_device(chip);
}

15
drivers/leds/leds-lp5562.c
View File

@ -144,12 +144,6 @@ static void lp5562_load_engine(struct lp55xx_chip *chip)
lp5562_wait_opmode_done();
}
static void lp5562_stop_engine(struct lp55xx_chip *chip)
{
lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DISABLE);
lp5562_wait_opmode_done();
}
static void lp5562_run_engine(struct lp55xx_chip *chip, bool start)
{
int ret;
@ -160,7 +154,7 @@ static void lp5562_run_engine(struct lp55xx_chip *chip, bool start)
if (!start) {
lp55xx_write(chip, LP5562_REG_ENABLE, LP5562_ENABLE_DEFAULT);
lp5562_wait_enable_done();
lp5562_stop_engine(chip);
lp55xx_stop_all_engine(chip);
lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
lp5562_wait_opmode_done();
@ -369,7 +363,7 @@ static int lp5562_run_predef_led_pattern(struct lp55xx_chip *chip, int mode)
return -EINVAL;
}
lp5562_stop_engine(chip);
lp55xx_stop_all_engine(chip);
/* Set LED map as RGB */
lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_RGB);
@ -495,6 +489,9 @@ static const struct attribute_group lp5562_group = {
/* Chip specific configurations */
static struct lp55xx_device_config lp5562_cfg = {
.max_channel = LP5562_MAX_LEDS,
.reg_op_mode = {
.addr = LP5562_REG_OP_MODE,
},
.reset = {
.addr = LP5562_REG_RESET,
.val = LP5562_RESET,
@ -577,7 +574,7 @@ static void lp5562_remove(struct i2c_client *client)
struct lp55xx_led *led = i2c_get_clientdata(client);
struct lp55xx_chip *chip = led->chip;
lp5562_stop_engine(chip);
lp55xx_stop_all_engine(chip);
lp55xx_unregister_sysfs(chip);
lp55xx_deinit_device(chip);

36
drivers/leds/leds-lp55xx-common.c
View File

@ -13,6 +13,7 @@
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
#include <linux/iopoll.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_data/leds-lp55xx.h>
@ -22,6 +23,12 @@
#include "leds-lp55xx-common.h"
/* OP MODE require at least 153 us to clear regs */
#define LP55XX_CMD_SLEEP 200
/* Program Commands */
#define LP55xx_MODE_DISABLE_ALL_ENG 0x0
/* External clock rate */
#define LP55XX_CLK_32K 32768
@ -40,6 +47,35 @@ static struct lp55xx_led *mcled_cdev_to_led(struct led_classdev_mc *mc_cdev)
return container_of(mc_cdev, struct lp55xx_led, mc_cdev);
}
static void lp55xx_wait_opmode_done(struct lp55xx_chip *chip)
{
struct lp55xx_device_config *cfg = chip->cfg;
int __always_unused ret;
u8 val;
/*
* Recent chip supports BUSY bit for engine.
* Check support by checking if val is not 0.
* For legacy device, sleep at least 153 us.
*/
if (cfg->engine_busy.val) {
read_poll_timeout(lp55xx_read, ret, !(val & cfg->engine_busy.mask),
LP55XX_CMD_SLEEP, LP55XX_CMD_SLEEP * 10, false,
chip, cfg->engine_busy.addr, &val);
} else {
usleep_range(LP55XX_CMD_SLEEP, LP55XX_CMD_SLEEP * 2);
}
}
void lp55xx_stop_all_engine(struct lp55xx_chip *chip)
{
struct lp55xx_device_config *cfg = chip->cfg;
lp55xx_write(chip, cfg->reg_op_mode.addr, LP55xx_MODE_DISABLE_ALL_ENG);
lp55xx_wait_opmode_done(chip);
}
EXPORT_SYMBOL_GPL(lp55xx_stop_all_engine);
static void lp55xx_reset_device(struct lp55xx_chip *chip)
{
struct lp55xx_device_config *cfg = chip->cfg;

16
drivers/leds/leds-lp55xx-common.h
View File

@ -81,15 +81,22 @@ struct lp55xx_chip;
/*
* struct lp55xx_reg
* @addr : Register address
* @val : Register value
* @val : Register value (can also used as mask or shift)
*/
struct lp55xx_reg {
u8 addr;
u8 val;
union {
u8 val;
u8 mask;
u8 shift;
};
};
/*
* struct lp55xx_device_config
* @reg_op_mode : Chip specific OP MODE reg addr
* @engine_busy : Chip specific engine busy
* (if not supported 153 us sleep)
* @reset : Chip specific reset command
* @enable : Chip specific enable command
* @max_channel : Maximum number of channels
@ -102,6 +109,8 @@ struct lp55xx_reg {
* @dev_attr_group : Device specific attributes
*/
struct lp55xx_device_config {
const struct lp55xx_reg reg_op_mode; /* addr, shift */
const struct lp55xx_reg engine_busy; /* addr, mask */
const struct lp55xx_reg reset;
const struct lp55xx_reg enable;
const int max_channel;
@ -191,6 +200,9 @@ extern int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg,
/* external clock detection */
extern bool lp55xx_is_extclk_used(struct lp55xx_chip *chip);
/* common chip functions */
extern void lp55xx_stop_all_engine(struct lp55xx_chip *chip);
/* common device init/deinit functions */
extern int lp55xx_init_device(struct lp55xx_chip *chip);
extern void lp55xx_deinit_device(struct lp55xx_chip *chip);

20
drivers/leds/leds-lp8501.c
View File

@ -58,6 +58,9 @@
#define LP8501_INT_CLK BIT(0)
#define LP8501_DEFAULT_CFG (LP8501_PWM_PSAVE | LP8501_AUTO_INC | LP8501_PWR_SAVE)
#define LP8501_REG_STATUS 0x3A
#define LP8501_ENGINE_BUSY BIT(4)
#define LP8501_REG_RESET 0x3D
#define LP8501_RESET 0xFF
@ -141,12 +144,6 @@ static void lp8501_load_engine(struct lp55xx_chip *chip)
lp55xx_write(chip, LP8501_REG_PROG_PAGE_SEL, page_sel[idx]);
}
static void lp8501_stop_engine(struct lp55xx_chip *chip)
{
lp55xx_write(chip, LP8501_REG_OP_MODE, 0);
lp8501_wait_opmode_done();
}
static void lp8501_turn_off_channels(struct lp55xx_chip *chip)
{
int i;
@ -163,7 +160,7 @@ static void lp8501_run_engine(struct lp55xx_chip *chip, bool start)
/* stop engine */
if (!start) {
lp8501_stop_engine(chip);
lp55xx_stop_all_engine(chip);
lp8501_turn_off_channels(chip);
return;
}
@ -285,6 +282,13 @@ static int lp8501_led_brightness(struct lp55xx_led *led)
/* Chip specific configurations */
static struct lp55xx_device_config lp8501_cfg = {
.reg_op_mode = {
.addr = LP8501_REG_OP_MODE,
},
.engine_busy = {
.addr = LP8501_REG_STATUS,
.maks = LP8501_ENGINE_BUSY,
},
.reset = {
.addr = LP8501_REG_RESET,
.val = LP8501_RESET,
@ -369,7 +373,7 @@ static void lp8501_remove(struct i2c_client *client)
struct lp55xx_led *led = i2c_get_clientdata(client);
struct lp55xx_chip *chip = led->chip;
lp8501_stop_engine(chip);
lp55xx_stop_all_engine(chip);
lp55xx_unregister_sysfs(chip);
lp55xx_deinit_device(chip);
}