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mfd: Add TI LMU driver

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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>
This commit is contained in:
Milo Kim 2017-02-28 15:45:15 +09:00 • committed by Lee Jones
parent 287cce719d
commit d5aa11bfe9
5 changed files with 640 additions and 0 deletions
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87
include/linux/mfd/ti-lmu.h Normal file
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/*
* TI LMU (Lighting Management Unit) Devices
*
* 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.
*/
#ifndef __MFD_TI_LMU_H__
#define __MFD_TI_LMU_H__
#include <linux/gpio.h>
#include <linux/notifier.h>
#include <linux/regmap.h>
/* Notifier event */
#define LMU_EVENT_MONITOR_DONE 0x01
enum ti_lmu_id {
LM3532,
LM3631,
LM3632,
LM3633,
LM3695,
LM3697,
LMU_MAX_ID,
};
enum ti_lmu_max_current {
LMU_IMAX_5mA,
LMU_IMAX_6mA,
LMU_IMAX_7mA = 0x03,
LMU_IMAX_8mA,
LMU_IMAX_9mA,
LMU_IMAX_10mA = 0x07,
LMU_IMAX_11mA,
LMU_IMAX_12mA,
LMU_IMAX_13mA,
LMU_IMAX_14mA,
LMU_IMAX_15mA = 0x0D,
LMU_IMAX_16mA,
LMU_IMAX_17mA,
LMU_IMAX_18mA,
LMU_IMAX_19mA,
LMU_IMAX_20mA = 0x13,
LMU_IMAX_21mA,
LMU_IMAX_22mA,
LMU_IMAX_23mA = 0x17,
LMU_IMAX_24mA,
LMU_IMAX_25mA,
LMU_IMAX_26mA,
LMU_IMAX_27mA = 0x1C,
LMU_IMAX_28mA,
LMU_IMAX_29mA,
LMU_IMAX_30mA,
};
enum lm363x_regulator_id {
LM3631_BOOST, /* Boost output */
LM3631_LDO_CONT, /* Display panel controller */
LM3631_LDO_OREF, /* Gamma reference */
LM3631_LDO_POS, /* Positive display bias output */
LM3631_LDO_NEG, /* Negative display bias output */
LM3632_BOOST, /* Boost output */
LM3632_LDO_POS, /* Positive display bias output */
LM3632_LDO_NEG, /* Negative display bias output */
};
/**
* struct ti_lmu
*
* @dev: Parent device pointer
* @regmap: Used for i2c communcation on accessing registers
* @en_gpio: GPIO for HWEN pin [Optional]
* @notifier: Notifier for reporting hwmon event
*/
struct ti_lmu {
struct device *dev;
struct regmap *regmap;
int en_gpio;
struct blocking_notifier_head notifier;
};
#endif