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  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * TI LMU (Lighting Management Unit) Core Driver
  4 *
  5 * Copyright 2017 Texas Instruments
  6 *
  7 * Author: Milo Kim <milo.kim@ti.com>
  8 */
  9
 10#include <linux/delay.h>
 11#include <linux/err.h>
 12#include <linux/gpio/consumer.h>
 13#include <linux/i2c.h>
 14#include <linux/kernel.h>
 15#include <linux/mfd/core.h>
 16#include <linux/mfd/ti-lmu.h>
 17#include <linux/mfd/ti-lmu-register.h>
 18#include <linux/module.h>
 19#include <linux/of.h>
 20#include <linux/of_device.h>
 21#include <linux/slab.h>
 22
 23struct ti_lmu_data {
 24	const struct mfd_cell *cells;
 25	int num_cells;
 26	unsigned int max_register;
 27};
 28
 29static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id)
 30{
 31	if (lmu->en_gpio)
 32		gpiod_set_value(lmu->en_gpio, 1);
 33
 34	/* Delay about 1ms after HW enable pin control */
 35	usleep_range(1000, 1500);
 36
 37	/* LM3631 has additional power up sequence - enable LCD_EN bit. */
 38	if (id == LM3631) {
 39		return regmap_update_bits(lmu->regmap, LM3631_REG_DEVCTRL,
 40					  LM3631_LCD_EN_MASK,
 41					  LM3631_LCD_EN_MASK);
 42	}
 43
 44	return 0;
 45}
 46
 47static void ti_lmu_disable_hw(void *data)
 48{
 49	struct ti_lmu *lmu = data;
 50	if (lmu->en_gpio)
 51		gpiod_set_value(lmu->en_gpio, 0);
 52}
 53
 54#define LM363X_REGULATOR(_id)			\
 55{						\
 56	.name          = "lm363x-regulator",	\
 57	.id            = _id,			\
 58	.of_compatible = "ti,lm363x-regulator",	\
 59}						\
 60
 61static const struct mfd_cell lm3631_devices[] = {
 62	LM363X_REGULATOR(LM3631_BOOST),
 63	LM363X_REGULATOR(LM3631_LDO_CONT),
 64	LM363X_REGULATOR(LM3631_LDO_OREF),
 65	LM363X_REGULATOR(LM3631_LDO_POS),
 66	LM363X_REGULATOR(LM3631_LDO_NEG),
 67	{
 68		.name          = "ti-lmu-backlight",
 69		.id            = LM3631,
 70		.of_compatible = "ti,lm3631-backlight",
 71	},
 72};
 73
 74static const struct mfd_cell lm3632_devices[] = {
 75	LM363X_REGULATOR(LM3632_BOOST),
 76	LM363X_REGULATOR(LM3632_LDO_POS),
 77	LM363X_REGULATOR(LM3632_LDO_NEG),
 78	{
 79		.name          = "ti-lmu-backlight",
 80		.id            = LM3632,
 81		.of_compatible = "ti,lm3632-backlight",
 82	},
 83};
 84
 85static const struct mfd_cell lm3633_devices[] = {
 86	{
 87		.name          = "ti-lmu-backlight",
 88		.id            = LM3633,
 89		.of_compatible = "ti,lm3633-backlight",
 90	},
 91	{
 92		.name          = "lm3633-leds",
 93		.of_compatible = "ti,lm3633-leds",
 94	},
 95	/* Monitoring driver for open/short circuit detection */
 96	{
 97		.name          = "ti-lmu-fault-monitor",
 98		.id            = LM3633,
 99		.of_compatible = "ti,lm3633-fault-monitor",
100	},
101};
102
103static const struct mfd_cell lm3695_devices[] = {
104	{
105		.name          = "ti-lmu-backlight",
106		.id            = LM3695,
107		.of_compatible = "ti,lm3695-backlight",
108	},
109};
110
111static const struct mfd_cell lm36274_devices[] = {
112	LM363X_REGULATOR(LM36274_BOOST),
113	LM363X_REGULATOR(LM36274_LDO_POS),
114	LM363X_REGULATOR(LM36274_LDO_NEG),
115	{
116		.name          = "lm36274-leds",
117		.id            = LM36274,
118		.of_compatible = "ti,lm36274-backlight",
119	},
120};
121
122#define TI_LMU_DATA(chip, max_reg)		\
123static const struct ti_lmu_data chip##_data =	\
124{						\
125	.cells = chip##_devices,		\
126	.num_cells = ARRAY_SIZE(chip##_devices),\
127	.max_register = max_reg,		\
128}						\
129
130TI_LMU_DATA(lm3631, LM3631_MAX_REG);
131TI_LMU_DATA(lm3632, LM3632_MAX_REG);
132TI_LMU_DATA(lm3633, LM3633_MAX_REG);
133TI_LMU_DATA(lm3695, LM3695_MAX_REG);
134TI_LMU_DATA(lm36274, LM36274_MAX_REG);
135
136static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
137{
138	struct device *dev = &cl->dev;
139	const struct ti_lmu_data *data;
140	struct regmap_config regmap_cfg;
141	struct ti_lmu *lmu;
142	int ret;
143
144	/*
145	 * Get device specific data from of_match table.
146	 * This data is defined by using TI_LMU_DATA() macro.
147	 */
148	data = of_device_get_match_data(dev);
149	if (!data)
150		return -ENODEV;
151
152	lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL);
153	if (!lmu)
154		return -ENOMEM;
155
156	lmu->dev = &cl->dev;
157
158	/* Setup regmap */
159	memset(&regmap_cfg, 0, sizeof(struct regmap_config));
160	regmap_cfg.reg_bits = 8;
161	regmap_cfg.val_bits = 8;
162	regmap_cfg.name = id->name;
163	regmap_cfg.max_register = data->max_register;
164
165	lmu->regmap = devm_regmap_init_i2c(cl, &regmap_cfg);
166	if (IS_ERR(lmu->regmap))
167		return PTR_ERR(lmu->regmap);
168
169	/* HW enable pin control and additional power up sequence if required */
170	lmu->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
171	if (IS_ERR(lmu->en_gpio)) {
172		ret = PTR_ERR(lmu->en_gpio);
173		dev_err(dev, "Can not request enable GPIO: %d\n", ret);
174		return ret;
175	}
176
177	ret = ti_lmu_enable_hw(lmu, id->driver_data);
178	if (ret)
179		return ret;
180
181	ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu);
182	if (ret)
183		return ret;
184
185	/*
186	 * Fault circuit(open/short) can be detected by ti-lmu-fault-monitor.
187	 * After fault detection is done, some devices should re-initialize
188	 * configuration. The notifier enables such kind of handling.
189	 */
190	BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier);
191
192	i2c_set_clientdata(cl, lmu);
193
194	return devm_mfd_add_devices(lmu->dev, 0, data->cells,
195				    data->num_cells, NULL, 0, NULL);
196}
197
198static const struct of_device_id ti_lmu_of_match[] = {
199	{ .compatible = "ti,lm3631", .data = &lm3631_data },
200	{ .compatible = "ti,lm3632", .data = &lm3632_data },
201	{ .compatible = "ti,lm3633", .data = &lm3633_data },
202	{ .compatible = "ti,lm3695", .data = &lm3695_data },
203	{ .compatible = "ti,lm36274", .data = &lm36274_data },
204	{ }
205};
206MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
207
208static const struct i2c_device_id ti_lmu_ids[] = {
209	{ "lm3631", LM3631 },
210	{ "lm3632", LM3632 },
211	{ "lm3633", LM3633 },
212	{ "lm3695", LM3695 },
213	{ "lm36274", LM36274 },
214	{ }
215};
216MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
217
218static struct i2c_driver ti_lmu_driver = {
219	.probe = ti_lmu_probe,
220	.driver = {
221		.name = "ti-lmu",
222		.of_match_table = ti_lmu_of_match,
223	},
224	.id_table = ti_lmu_ids,
225};
226
227module_i2c_driver(ti_lmu_driver);
228
229MODULE_DESCRIPTION("TI LMU MFD Core Driver");
230MODULE_AUTHOR("Milo Kim");
231MODULE_LICENSE("GPL v2");