mfd: Add TI LMU driver
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
259
drivers/mfd/ti-lmu.c
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259
drivers/mfd/ti-lmu.c
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/*
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* TI LMU (Lighting Management Unit) Core Driver
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*
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* Copyright 2017 Texas Instruments
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*
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* Author: Milo Kim <milo.kim@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/ti-lmu.h>
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#include <linux/mfd/ti-lmu-register.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/slab.h>
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struct ti_lmu_data {
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struct mfd_cell *cells;
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int num_cells;
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unsigned int max_register;
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};
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static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id)
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{
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int ret;
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if (gpio_is_valid(lmu->en_gpio)) {
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ret = devm_gpio_request_one(lmu->dev, lmu->en_gpio,
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GPIOF_OUT_INIT_HIGH, "lmu_hwen");
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if (ret) {
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dev_err(lmu->dev, "Can not request enable GPIO: %d\n",
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ret);
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return ret;
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}
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}
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/* Delay about 1ms after HW enable pin control */
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usleep_range(1000, 1500);
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/* LM3631 has additional power up sequence - enable LCD_EN bit. */
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if (id == LM3631) {
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return regmap_update_bits(lmu->regmap, LM3631_REG_DEVCTRL,
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LM3631_LCD_EN_MASK,
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LM3631_LCD_EN_MASK);
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}
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return 0;
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}
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static void ti_lmu_disable_hw(struct ti_lmu *lmu)
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{
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if (gpio_is_valid(lmu->en_gpio))
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gpio_set_value(lmu->en_gpio, 0);
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}
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static struct mfd_cell lm3532_devices[] = {
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{
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.name = "ti-lmu-backlight",
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.id = LM3532,
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.of_compatible = "ti,lm3532-backlight",
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},
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};
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#define LM363X_REGULATOR(_id) \
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{ \
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.name = "lm363x-regulator", \
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.id = _id, \
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.of_compatible = "ti,lm363x-regulator", \
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} \
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static struct mfd_cell lm3631_devices[] = {
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LM363X_REGULATOR(LM3631_BOOST),
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LM363X_REGULATOR(LM3631_LDO_CONT),
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LM363X_REGULATOR(LM3631_LDO_OREF),
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LM363X_REGULATOR(LM3631_LDO_POS),
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LM363X_REGULATOR(LM3631_LDO_NEG),
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{
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.name = "ti-lmu-backlight",
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.id = LM3631,
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.of_compatible = "ti,lm3631-backlight",
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},
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};
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static struct mfd_cell lm3632_devices[] = {
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LM363X_REGULATOR(LM3632_BOOST),
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LM363X_REGULATOR(LM3632_LDO_POS),
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LM363X_REGULATOR(LM3632_LDO_NEG),
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{
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.name = "ti-lmu-backlight",
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.id = LM3632,
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.of_compatible = "ti,lm3632-backlight",
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},
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};
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static struct mfd_cell lm3633_devices[] = {
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{
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.name = "ti-lmu-backlight",
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.id = LM3633,
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.of_compatible = "ti,lm3633-backlight",
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},
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{
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.name = "lm3633-leds",
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.of_compatible = "ti,lm3633-leds",
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},
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/* Monitoring driver for open/short circuit detection */
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{
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.name = "ti-lmu-fault-monitor",
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.id = LM3633,
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.of_compatible = "ti,lm3633-fault-monitor",
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},
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};
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static struct mfd_cell lm3695_devices[] = {
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{
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.name = "ti-lmu-backlight",
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.id = LM3695,
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.of_compatible = "ti,lm3695-backlight",
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},
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};
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static struct mfd_cell lm3697_devices[] = {
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{
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.name = "ti-lmu-backlight",
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.id = LM3697,
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.of_compatible = "ti,lm3697-backlight",
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},
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/* Monitoring driver for open/short circuit detection */
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{
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.name = "ti-lmu-fault-monitor",
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.id = LM3697,
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.of_compatible = "ti,lm3697-fault-monitor",
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},
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};
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#define TI_LMU_DATA(chip, max_reg) \
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static const struct ti_lmu_data chip##_data = \
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{ \
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.cells = chip##_devices, \
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.num_cells = ARRAY_SIZE(chip##_devices),\
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.max_register = max_reg, \
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} \
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TI_LMU_DATA(lm3532, LM3532_MAX_REG);
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TI_LMU_DATA(lm3631, LM3631_MAX_REG);
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TI_LMU_DATA(lm3632, LM3632_MAX_REG);
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TI_LMU_DATA(lm3633, LM3633_MAX_REG);
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TI_LMU_DATA(lm3695, LM3695_MAX_REG);
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TI_LMU_DATA(lm3697, LM3697_MAX_REG);
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static const struct of_device_id ti_lmu_of_match[] = {
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{ .compatible = "ti,lm3532", .data = &lm3532_data },
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{ .compatible = "ti,lm3631", .data = &lm3631_data },
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{ .compatible = "ti,lm3632", .data = &lm3632_data },
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{ .compatible = "ti,lm3633", .data = &lm3633_data },
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{ .compatible = "ti,lm3695", .data = &lm3695_data },
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{ .compatible = "ti,lm3697", .data = &lm3697_data },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
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static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
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{
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struct device *dev = &cl->dev;
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const struct of_device_id *match;
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const struct ti_lmu_data *data;
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struct regmap_config regmap_cfg;
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struct ti_lmu *lmu;
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int ret;
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match = of_match_device(ti_lmu_of_match, dev);
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if (!match)
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return -ENODEV;
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/*
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* Get device specific data from of_match table.
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* This data is defined by using TI_LMU_DATA() macro.
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*/
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data = (struct ti_lmu_data *)match->data;
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lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL);
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if (!lmu)
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return -ENOMEM;
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lmu->dev = &cl->dev;
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/* Setup regmap */
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memset(®map_cfg, 0, sizeof(struct regmap_config));
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regmap_cfg.reg_bits = 8;
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regmap_cfg.val_bits = 8;
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regmap_cfg.name = id->name;
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regmap_cfg.max_register = data->max_register;
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lmu->regmap = devm_regmap_init_i2c(cl, ®map_cfg);
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if (IS_ERR(lmu->regmap))
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return PTR_ERR(lmu->regmap);
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/* HW enable pin control and additional power up sequence if required */
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lmu->en_gpio = of_get_named_gpio(dev->of_node, "enable-gpios", 0);
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ret = ti_lmu_enable_hw(lmu, id->driver_data);
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if (ret)
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return ret;
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/*
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* Fault circuit(open/short) can be detected by ti-lmu-fault-monitor.
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* After fault detection is done, some devices should re-initialize
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* configuration. The notifier enables such kind of handling.
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*/
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BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier);
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i2c_set_clientdata(cl, lmu);
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return mfd_add_devices(lmu->dev, 0, data->cells,
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data->num_cells, NULL, 0, NULL);
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}
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static int ti_lmu_remove(struct i2c_client *cl)
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{
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struct ti_lmu *lmu = i2c_get_clientdata(cl);
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ti_lmu_disable_hw(lmu);
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mfd_remove_devices(lmu->dev);
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return 0;
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}
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static const struct i2c_device_id ti_lmu_ids[] = {
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{ "lm3532", LM3532 },
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{ "lm3631", LM3631 },
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{ "lm3632", LM3632 },
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{ "lm3633", LM3633 },
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{ "lm3695", LM3695 },
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{ "lm3697", LM3697 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
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static struct i2c_driver ti_lmu_driver = {
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.probe = ti_lmu_probe,
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.remove = ti_lmu_remove,
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.driver = {
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.name = "ti-lmu",
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.of_match_table = ti_lmu_of_match,
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},
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.id_table = ti_lmu_ids,
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};
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module_i2c_driver(ti_lmu_driver);
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MODULE_DESCRIPTION("TI LMU MFD Core Driver");
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MODULE_AUTHOR("Milo Kim");
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MODULE_LICENSE("GPL v2");
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