forked from Minki/linux
d5aa11bfe9
TI LMU (Lighting Management Unit) driver supports lighting devices below. LM3532, LM3631, LM3632, LM3633, LM3695 and LM3697. LMU devices have common features. - I2C interface for accessing device registers - Hardware enable pin control - Backlight brightness control - Notifier for hardware fault monitoring - Regulators for LCD display bias It contains fault monitor, backlight, LED and regulator driver. LMU fault monitor ----------------- LM3633 and LM3697 provide hardware monitoring feature. It enables open or short circuit detection. After monitoring is done, each device should be re-initialized. Notifier is used for this case. Separate patch for 'ti-lmu-fault-monitor' will be sent later. Backlight --------- It's handled by TI LMU backlight consolidated driver and chip dependent data. Separate patchset will be sent later. LED indicator ------------- LM3633 has 6 indicator LEDs. Programmable dimming pattern is also supported. Separate patch for 'leds-lm3633' will be sent later. Regulator --------- LM3631 has 5 regulators for the display bias. LM3632 supports 3 regulators. One consolidated driver enables it. The lm363x regulator driver is already upstreamed. Signed-off-by: Milo Kim <milo.kim@ti.com> Tested-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
260 lines
6.3 KiB
C
260 lines
6.3 KiB
C
/*
|
|
* TI LMU (Lighting Management Unit) Core Driver
|
|
*
|
|
* Copyright 2017 Texas Instruments
|
|
*
|
|
* Author: Milo Kim <milo.kim@ti.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/err.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mfd/core.h>
|
|
#include <linux/mfd/ti-lmu.h>
|
|
#include <linux/mfd/ti-lmu-register.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of_gpio.h>
|
|
#include <linux/slab.h>
|
|
|
|
struct ti_lmu_data {
|
|
struct mfd_cell *cells;
|
|
int num_cells;
|
|
unsigned int max_register;
|
|
};
|
|
|
|
static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id)
|
|
{
|
|
int ret;
|
|
|
|
if (gpio_is_valid(lmu->en_gpio)) {
|
|
ret = devm_gpio_request_one(lmu->dev, lmu->en_gpio,
|
|
GPIOF_OUT_INIT_HIGH, "lmu_hwen");
|
|
if (ret) {
|
|
dev_err(lmu->dev, "Can not request enable GPIO: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* Delay about 1ms after HW enable pin control */
|
|
usleep_range(1000, 1500);
|
|
|
|
/* LM3631 has additional power up sequence - enable LCD_EN bit. */
|
|
if (id == LM3631) {
|
|
return regmap_update_bits(lmu->regmap, LM3631_REG_DEVCTRL,
|
|
LM3631_LCD_EN_MASK,
|
|
LM3631_LCD_EN_MASK);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ti_lmu_disable_hw(struct ti_lmu *lmu)
|
|
{
|
|
if (gpio_is_valid(lmu->en_gpio))
|
|
gpio_set_value(lmu->en_gpio, 0);
|
|
}
|
|
|
|
static struct mfd_cell lm3532_devices[] = {
|
|
{
|
|
.name = "ti-lmu-backlight",
|
|
.id = LM3532,
|
|
.of_compatible = "ti,lm3532-backlight",
|
|
},
|
|
};
|
|
|
|
#define LM363X_REGULATOR(_id) \
|
|
{ \
|
|
.name = "lm363x-regulator", \
|
|
.id = _id, \
|
|
.of_compatible = "ti,lm363x-regulator", \
|
|
} \
|
|
|
|
static struct mfd_cell lm3631_devices[] = {
|
|
LM363X_REGULATOR(LM3631_BOOST),
|
|
LM363X_REGULATOR(LM3631_LDO_CONT),
|
|
LM363X_REGULATOR(LM3631_LDO_OREF),
|
|
LM363X_REGULATOR(LM3631_LDO_POS),
|
|
LM363X_REGULATOR(LM3631_LDO_NEG),
|
|
{
|
|
.name = "ti-lmu-backlight",
|
|
.id = LM3631,
|
|
.of_compatible = "ti,lm3631-backlight",
|
|
},
|
|
};
|
|
|
|
static struct mfd_cell lm3632_devices[] = {
|
|
LM363X_REGULATOR(LM3632_BOOST),
|
|
LM363X_REGULATOR(LM3632_LDO_POS),
|
|
LM363X_REGULATOR(LM3632_LDO_NEG),
|
|
{
|
|
.name = "ti-lmu-backlight",
|
|
.id = LM3632,
|
|
.of_compatible = "ti,lm3632-backlight",
|
|
},
|
|
};
|
|
|
|
static struct mfd_cell lm3633_devices[] = {
|
|
{
|
|
.name = "ti-lmu-backlight",
|
|
.id = LM3633,
|
|
.of_compatible = "ti,lm3633-backlight",
|
|
},
|
|
{
|
|
.name = "lm3633-leds",
|
|
.of_compatible = "ti,lm3633-leds",
|
|
},
|
|
/* Monitoring driver for open/short circuit detection */
|
|
{
|
|
.name = "ti-lmu-fault-monitor",
|
|
.id = LM3633,
|
|
.of_compatible = "ti,lm3633-fault-monitor",
|
|
},
|
|
};
|
|
|
|
static struct mfd_cell lm3695_devices[] = {
|
|
{
|
|
.name = "ti-lmu-backlight",
|
|
.id = LM3695,
|
|
.of_compatible = "ti,lm3695-backlight",
|
|
},
|
|
};
|
|
|
|
static struct mfd_cell lm3697_devices[] = {
|
|
{
|
|
.name = "ti-lmu-backlight",
|
|
.id = LM3697,
|
|
.of_compatible = "ti,lm3697-backlight",
|
|
},
|
|
/* Monitoring driver for open/short circuit detection */
|
|
{
|
|
.name = "ti-lmu-fault-monitor",
|
|
.id = LM3697,
|
|
.of_compatible = "ti,lm3697-fault-monitor",
|
|
},
|
|
};
|
|
|
|
#define TI_LMU_DATA(chip, max_reg) \
|
|
static const struct ti_lmu_data chip##_data = \
|
|
{ \
|
|
.cells = chip##_devices, \
|
|
.num_cells = ARRAY_SIZE(chip##_devices),\
|
|
.max_register = max_reg, \
|
|
} \
|
|
|
|
TI_LMU_DATA(lm3532, LM3532_MAX_REG);
|
|
TI_LMU_DATA(lm3631, LM3631_MAX_REG);
|
|
TI_LMU_DATA(lm3632, LM3632_MAX_REG);
|
|
TI_LMU_DATA(lm3633, LM3633_MAX_REG);
|
|
TI_LMU_DATA(lm3695, LM3695_MAX_REG);
|
|
TI_LMU_DATA(lm3697, LM3697_MAX_REG);
|
|
|
|
static const struct of_device_id ti_lmu_of_match[] = {
|
|
{ .compatible = "ti,lm3532", .data = &lm3532_data },
|
|
{ .compatible = "ti,lm3631", .data = &lm3631_data },
|
|
{ .compatible = "ti,lm3632", .data = &lm3632_data },
|
|
{ .compatible = "ti,lm3633", .data = &lm3633_data },
|
|
{ .compatible = "ti,lm3695", .data = &lm3695_data },
|
|
{ .compatible = "ti,lm3697", .data = &lm3697_data },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
|
|
|
|
static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
|
|
{
|
|
struct device *dev = &cl->dev;
|
|
const struct of_device_id *match;
|
|
const struct ti_lmu_data *data;
|
|
struct regmap_config regmap_cfg;
|
|
struct ti_lmu *lmu;
|
|
int ret;
|
|
|
|
match = of_match_device(ti_lmu_of_match, dev);
|
|
if (!match)
|
|
return -ENODEV;
|
|
/*
|
|
* Get device specific data from of_match table.
|
|
* This data is defined by using TI_LMU_DATA() macro.
|
|
*/
|
|
data = (struct ti_lmu_data *)match->data;
|
|
|
|
lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL);
|
|
if (!lmu)
|
|
return -ENOMEM;
|
|
|
|
lmu->dev = &cl->dev;
|
|
|
|
/* Setup regmap */
|
|
memset(®map_cfg, 0, sizeof(struct regmap_config));
|
|
regmap_cfg.reg_bits = 8;
|
|
regmap_cfg.val_bits = 8;
|
|
regmap_cfg.name = id->name;
|
|
regmap_cfg.max_register = data->max_register;
|
|
|
|
lmu->regmap = devm_regmap_init_i2c(cl, ®map_cfg);
|
|
if (IS_ERR(lmu->regmap))
|
|
return PTR_ERR(lmu->regmap);
|
|
|
|
/* HW enable pin control and additional power up sequence if required */
|
|
lmu->en_gpio = of_get_named_gpio(dev->of_node, "enable-gpios", 0);
|
|
ret = ti_lmu_enable_hw(lmu, id->driver_data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Fault circuit(open/short) can be detected by ti-lmu-fault-monitor.
|
|
* After fault detection is done, some devices should re-initialize
|
|
* configuration. The notifier enables such kind of handling.
|
|
*/
|
|
BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier);
|
|
|
|
i2c_set_clientdata(cl, lmu);
|
|
|
|
return mfd_add_devices(lmu->dev, 0, data->cells,
|
|
data->num_cells, NULL, 0, NULL);
|
|
}
|
|
|
|
static int ti_lmu_remove(struct i2c_client *cl)
|
|
{
|
|
struct ti_lmu *lmu = i2c_get_clientdata(cl);
|
|
|
|
ti_lmu_disable_hw(lmu);
|
|
mfd_remove_devices(lmu->dev);
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id ti_lmu_ids[] = {
|
|
{ "lm3532", LM3532 },
|
|
{ "lm3631", LM3631 },
|
|
{ "lm3632", LM3632 },
|
|
{ "lm3633", LM3633 },
|
|
{ "lm3695", LM3695 },
|
|
{ "lm3697", LM3697 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
|
|
|
|
static struct i2c_driver ti_lmu_driver = {
|
|
.probe = ti_lmu_probe,
|
|
.remove = ti_lmu_remove,
|
|
.driver = {
|
|
.name = "ti-lmu",
|
|
.of_match_table = ti_lmu_of_match,
|
|
},
|
|
.id_table = ti_lmu_ids,
|
|
};
|
|
|
|
module_i2c_driver(ti_lmu_driver);
|
|
|
|
MODULE_DESCRIPTION("TI LMU MFD Core Driver");
|
|
MODULE_AUTHOR("Milo Kim");
|
|
MODULE_LICENSE("GPL v2");
|