linux/drivers/mfd/ti-lmu.c
Linus Torvalds 8a3367cc80 LED updates for 5.3-rc1
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Merge tag 'leds-for-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds

Pull LED updates from Jacek Anaszewski:

 - Add a new LED common module for ti-lmu driver family

 - Modify MFD ti-lmu bindings
        - add ti,brightness-resolution
        - add the ramp up/down property

 - Add regulator support for LM36274 driver to lm363x-regulator.c

 - New LED class drivers with DT bindings:
        - leds-spi-byte
        - leds-lm36274
        - leds-lm3697 (move the support from MFD to LED subsystem)

 - Simplify getting the I2C adapter of a client:
        - leds-tca6507
        - leds-pca955x

 - Convert LED documentation to ReST

* tag 'leds-for-5.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds:
  dt: leds-lm36274.txt: fix a broken reference to ti-lmu.txt
  docs: leds: convert to ReST
  leds: leds-tca6507: simplify getting the adapter of a client
  leds: leds-pca955x: simplify getting the adapter of a client
  leds: lm36274: Introduce the TI LM36274 LED driver
  dt-bindings: leds: Add LED bindings for the LM36274
  regulator: lm363x: Add support for LM36274
  mfd: ti-lmu: Add LM36274 support to the ti-lmu
  dt-bindings: mfd: Add lm36274 bindings to ti-lmu
  leds: max77650: Remove set but not used variable 'parent'
  leds: avoid flush_work in atomic context
  leds: lm3697: Introduce the lm3697 driver
  mfd: ti-lmu: Remove support for LM3697
  dt-bindings: ti-lmu: Modify dt bindings for the LM3697
  leds: TI LMU: Add common code for TI LMU devices
  leds: spi-byte: add single byte SPI LED driver
  dt-bindings: leds: Add binding for spi-byte LED.
  dt-bindings: mfd: LMU: Add ti,brightness-resolution
  dt-bindings: mfd: LMU: Add the ramp up/down property
2019-07-09 08:59:39 -07:00

232 lines
5.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* TI LMU (Lighting Management Unit) Core Driver
*
* Copyright 2017 Texas Instruments
*
* Author: Milo Kim <milo.kim@ti.com>
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio/consumer.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/slab.h>
struct ti_lmu_data {
const 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)
{
if (lmu->en_gpio)
gpiod_set_value(lmu->en_gpio, 1);
/* 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(void *data)
{
struct ti_lmu *lmu = data;
if (lmu->en_gpio)
gpiod_set_value(lmu->en_gpio, 0);
}
#define LM363X_REGULATOR(_id) \
{ \
.name = "lm363x-regulator", \
.id = _id, \
.of_compatible = "ti,lm363x-regulator", \
} \
static const 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 const 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 const 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 const struct mfd_cell lm3695_devices[] = {
{
.name = "ti-lmu-backlight",
.id = LM3695,
.of_compatible = "ti,lm3695-backlight",
},
};
static const struct mfd_cell lm36274_devices[] = {
LM363X_REGULATOR(LM36274_BOOST),
LM363X_REGULATOR(LM36274_LDO_POS),
LM363X_REGULATOR(LM36274_LDO_NEG),
{
.name = "lm36274-leds",
.id = LM36274,
.of_compatible = "ti,lm36274-backlight",
},
};
#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(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(lm36274, LM36274_MAX_REG);
static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
{
struct device *dev = &cl->dev;
const struct ti_lmu_data *data;
struct regmap_config regmap_cfg;
struct ti_lmu *lmu;
int ret;
/*
* Get device specific data from of_match table.
* This data is defined by using TI_LMU_DATA() macro.
*/
data = of_device_get_match_data(dev);
if (!data)
return -ENODEV;
lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL);
if (!lmu)
return -ENOMEM;
lmu->dev = &cl->dev;
/* Setup regmap */
memset(&regmap_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, &regmap_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 = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
if (IS_ERR(lmu->en_gpio)) {
ret = PTR_ERR(lmu->en_gpio);
dev_err(dev, "Can not request enable GPIO: %d\n", ret);
return ret;
}
ret = ti_lmu_enable_hw(lmu, id->driver_data);
if (ret)
return ret;
ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu);
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 devm_mfd_add_devices(lmu->dev, 0, data->cells,
data->num_cells, NULL, 0, NULL);
}
static const struct of_device_id ti_lmu_of_match[] = {
{ .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,lm36274", .data = &lm36274_data },
{ }
};
MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
static const struct i2c_device_id ti_lmu_ids[] = {
{ "lm3631", LM3631 },
{ "lm3632", LM3632 },
{ "lm3633", LM3633 },
{ "lm3695", LM3695 },
{ "lm36274", LM36274 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
static struct i2c_driver ti_lmu_driver = {
.probe = ti_lmu_probe,
.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");