1 // SPDX-License-Identifier: GPL-2.0-only
3 * TI LMU (Lighting Management Unit) Core Driver
5 * Copyright 2017 Texas Instruments
7 * Author: Milo Kim <milo.kim@ti.com>
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>
20 #include <linux/of_device.h>
21 #include <linux/slab.h>
24 const struct mfd_cell *cells;
26 unsigned int max_register;
29 static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id)
32 gpiod_set_value(lmu->en_gpio, 1);
34 /* Delay about 1ms after HW enable pin control */
35 usleep_range(1000, 1500);
37 /* LM3631 has additional power up sequence - enable LCD_EN bit. */
39 return regmap_update_bits(lmu->regmap, LM3631_REG_DEVCTRL,
47 static void ti_lmu_disable_hw(void *data)
49 struct ti_lmu *lmu = data;
51 gpiod_set_value(lmu->en_gpio, 0);
54 #define LM363X_REGULATOR(_id) \
56 .name = "lm363x-regulator", \
58 .of_compatible = "ti,lm363x-regulator", \
61 static 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),
68 .name = "ti-lmu-backlight",
70 .of_compatible = "ti,lm3631-backlight",
74 static const struct mfd_cell lm3632_devices[] = {
75 LM363X_REGULATOR(LM3632_BOOST),
76 LM363X_REGULATOR(LM3632_LDO_POS),
77 LM363X_REGULATOR(LM3632_LDO_NEG),
79 .name = "ti-lmu-backlight",
81 .of_compatible = "ti,lm3632-backlight",
85 static const struct mfd_cell lm3633_devices[] = {
87 .name = "ti-lmu-backlight",
89 .of_compatible = "ti,lm3633-backlight",
92 .name = "lm3633-leds",
93 .of_compatible = "ti,lm3633-leds",
95 /* Monitoring driver for open/short circuit detection */
97 .name = "ti-lmu-fault-monitor",
99 .of_compatible = "ti,lm3633-fault-monitor",
103 static const struct mfd_cell lm3695_devices[] = {
105 .name = "ti-lmu-backlight",
107 .of_compatible = "ti,lm3695-backlight",
111 static const struct mfd_cell lm36274_devices[] = {
112 LM363X_REGULATOR(LM36274_BOOST),
113 LM363X_REGULATOR(LM36274_LDO_POS),
114 LM363X_REGULATOR(LM36274_LDO_NEG),
116 .name = "lm36274-leds",
118 .of_compatible = "ti,lm36274-backlight",
122 #define TI_LMU_DATA(chip, max_reg) \
123 static const struct ti_lmu_data chip##_data = \
125 .cells = chip##_devices, \
126 .num_cells = ARRAY_SIZE(chip##_devices),\
127 .max_register = max_reg, \
130 TI_LMU_DATA(lm3631, LM3631_MAX_REG);
131 TI_LMU_DATA(lm3632, LM3632_MAX_REG);
132 TI_LMU_DATA(lm3633, LM3633_MAX_REG);
133 TI_LMU_DATA(lm3695, LM3695_MAX_REG);
134 TI_LMU_DATA(lm36274, LM36274_MAX_REG);
136 static int ti_lmu_probe(struct i2c_client *cl)
138 const struct i2c_device_id *id = i2c_client_get_device_id(cl);
139 struct device *dev = &cl->dev;
140 const struct ti_lmu_data *data;
141 struct regmap_config regmap_cfg;
146 * Get device specific data from of_match table.
147 * This data is defined by using TI_LMU_DATA() macro.
149 data = of_device_get_match_data(dev);
153 lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL);
160 memset(®map_cfg, 0, sizeof(struct regmap_config));
161 regmap_cfg.reg_bits = 8;
162 regmap_cfg.val_bits = 8;
163 regmap_cfg.name = id->name;
164 regmap_cfg.max_register = data->max_register;
166 lmu->regmap = devm_regmap_init_i2c(cl, ®map_cfg);
167 if (IS_ERR(lmu->regmap))
168 return PTR_ERR(lmu->regmap);
170 /* HW enable pin control and additional power up sequence if required */
171 lmu->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
172 if (IS_ERR(lmu->en_gpio)) {
173 ret = PTR_ERR(lmu->en_gpio);
174 dev_err(dev, "Can not request enable GPIO: %d\n", ret);
178 ret = ti_lmu_enable_hw(lmu, id->driver_data);
182 ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu);
187 * Fault circuit(open/short) can be detected by ti-lmu-fault-monitor.
188 * After fault detection is done, some devices should re-initialize
189 * configuration. The notifier enables such kind of handling.
191 BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier);
193 i2c_set_clientdata(cl, lmu);
195 return devm_mfd_add_devices(lmu->dev, 0, data->cells,
196 data->num_cells, NULL, 0, NULL);
199 static const struct of_device_id ti_lmu_of_match[] = {
200 { .compatible = "ti,lm3631", .data = &lm3631_data },
201 { .compatible = "ti,lm3632", .data = &lm3632_data },
202 { .compatible = "ti,lm3633", .data = &lm3633_data },
203 { .compatible = "ti,lm3695", .data = &lm3695_data },
204 { .compatible = "ti,lm36274", .data = &lm36274_data },
207 MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
209 static const struct i2c_device_id ti_lmu_ids[] = {
210 { "lm3631", LM3631 },
211 { "lm3632", LM3632 },
212 { "lm3633", LM3633 },
213 { "lm3695", LM3695 },
214 { "lm36274", LM36274 },
217 MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
219 static struct i2c_driver ti_lmu_driver = {
220 .probe_new = ti_lmu_probe,
223 .of_match_table = ti_lmu_of_match,
225 .id_table = ti_lmu_ids,
228 module_i2c_driver(ti_lmu_driver);
230 MODULE_DESCRIPTION("TI LMU MFD Core Driver");
231 MODULE_AUTHOR("Milo Kim");
232 MODULE_LICENSE("GPL v2");