1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2d5aa11bfSMilo Kim /*
3d5aa11bfSMilo Kim * TI LMU (Lighting Management Unit) Core Driver
4d5aa11bfSMilo Kim *
5d5aa11bfSMilo Kim * Copyright 2017 Texas Instruments
6d5aa11bfSMilo Kim *
7d5aa11bfSMilo Kim * Author: Milo Kim <milo.kim@ti.com>
8d5aa11bfSMilo Kim */
9d5aa11bfSMilo Kim
10d5aa11bfSMilo Kim #include <linux/delay.h>
11d5aa11bfSMilo Kim #include <linux/err.h>
127a6a395bSPavel Machek #include <linux/gpio/consumer.h>
13d5aa11bfSMilo Kim #include <linux/i2c.h>
14d5aa11bfSMilo Kim #include <linux/kernel.h>
15d5aa11bfSMilo Kim #include <linux/mfd/core.h>
16d5aa11bfSMilo Kim #include <linux/mfd/ti-lmu.h>
17d5aa11bfSMilo Kim #include <linux/mfd/ti-lmu-register.h>
18d5aa11bfSMilo Kim #include <linux/module.h>
19d5aa11bfSMilo Kim #include <linux/of.h>
20d5aa11bfSMilo Kim #include <linux/slab.h>
21d5aa11bfSMilo Kim
22d5aa11bfSMilo Kim struct ti_lmu_data {
235b6850faSSebastian Reichel const struct mfd_cell *cells;
24d5aa11bfSMilo Kim int num_cells;
25d5aa11bfSMilo Kim unsigned int max_register;
26d5aa11bfSMilo Kim };
27d5aa11bfSMilo Kim
ti_lmu_enable_hw(struct ti_lmu * lmu,enum ti_lmu_id id)28d5aa11bfSMilo Kim static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id)
29d5aa11bfSMilo Kim {
307a6a395bSPavel Machek if (lmu->en_gpio)
317a6a395bSPavel Machek gpiod_set_value(lmu->en_gpio, 1);
32d5aa11bfSMilo Kim
33d5aa11bfSMilo Kim /* Delay about 1ms after HW enable pin control */
34d5aa11bfSMilo Kim usleep_range(1000, 1500);
35d5aa11bfSMilo Kim
36d5aa11bfSMilo Kim /* LM3631 has additional power up sequence - enable LCD_EN bit. */
37d5aa11bfSMilo Kim if (id == LM3631) {
38d5aa11bfSMilo Kim return regmap_update_bits(lmu->regmap, LM3631_REG_DEVCTRL,
39d5aa11bfSMilo Kim LM3631_LCD_EN_MASK,
40d5aa11bfSMilo Kim LM3631_LCD_EN_MASK);
41d5aa11bfSMilo Kim }
42d5aa11bfSMilo Kim
43d5aa11bfSMilo Kim return 0;
44d5aa11bfSMilo Kim }
45d5aa11bfSMilo Kim
ti_lmu_disable_hw(void * data)467891d375SPavel Machek static void ti_lmu_disable_hw(void *data)
47d5aa11bfSMilo Kim {
487891d375SPavel Machek struct ti_lmu *lmu = data;
497a6a395bSPavel Machek if (lmu->en_gpio)
507a6a395bSPavel Machek gpiod_set_value(lmu->en_gpio, 0);
51d5aa11bfSMilo Kim }
52d5aa11bfSMilo Kim
53d5aa11bfSMilo Kim #define LM363X_REGULATOR(_id) \
54d5aa11bfSMilo Kim { \
55d5aa11bfSMilo Kim .name = "lm363x-regulator", \
56d5aa11bfSMilo Kim .id = _id, \
57d5aa11bfSMilo Kim .of_compatible = "ti,lm363x-regulator", \
58d5aa11bfSMilo Kim } \
59d5aa11bfSMilo Kim
605b6850faSSebastian Reichel static const struct mfd_cell lm3631_devices[] = {
61d5aa11bfSMilo Kim LM363X_REGULATOR(LM3631_BOOST),
62d5aa11bfSMilo Kim LM363X_REGULATOR(LM3631_LDO_CONT),
63d5aa11bfSMilo Kim LM363X_REGULATOR(LM3631_LDO_OREF),
64d5aa11bfSMilo Kim LM363X_REGULATOR(LM3631_LDO_POS),
65d5aa11bfSMilo Kim LM363X_REGULATOR(LM3631_LDO_NEG),
66d5aa11bfSMilo Kim {
67d5aa11bfSMilo Kim .name = "ti-lmu-backlight",
68d5aa11bfSMilo Kim .id = LM3631,
69d5aa11bfSMilo Kim .of_compatible = "ti,lm3631-backlight",
70d5aa11bfSMilo Kim },
71d5aa11bfSMilo Kim };
72d5aa11bfSMilo Kim
735b6850faSSebastian Reichel static const struct mfd_cell lm3632_devices[] = {
74d5aa11bfSMilo Kim LM363X_REGULATOR(LM3632_BOOST),
75d5aa11bfSMilo Kim LM363X_REGULATOR(LM3632_LDO_POS),
76d5aa11bfSMilo Kim LM363X_REGULATOR(LM3632_LDO_NEG),
77d5aa11bfSMilo Kim {
78d5aa11bfSMilo Kim .name = "ti-lmu-backlight",
79d5aa11bfSMilo Kim .id = LM3632,
80d5aa11bfSMilo Kim .of_compatible = "ti,lm3632-backlight",
81d5aa11bfSMilo Kim },
82d5aa11bfSMilo Kim };
83d5aa11bfSMilo Kim
845b6850faSSebastian Reichel static const struct mfd_cell lm3633_devices[] = {
85d5aa11bfSMilo Kim {
86d5aa11bfSMilo Kim .name = "ti-lmu-backlight",
87d5aa11bfSMilo Kim .id = LM3633,
88d5aa11bfSMilo Kim .of_compatible = "ti,lm3633-backlight",
89d5aa11bfSMilo Kim },
90d5aa11bfSMilo Kim {
91d5aa11bfSMilo Kim .name = "lm3633-leds",
92d5aa11bfSMilo Kim .of_compatible = "ti,lm3633-leds",
93d5aa11bfSMilo Kim },
94d5aa11bfSMilo Kim /* Monitoring driver for open/short circuit detection */
95d5aa11bfSMilo Kim {
96d5aa11bfSMilo Kim .name = "ti-lmu-fault-monitor",
97d5aa11bfSMilo Kim .id = LM3633,
98d5aa11bfSMilo Kim .of_compatible = "ti,lm3633-fault-monitor",
99d5aa11bfSMilo Kim },
100d5aa11bfSMilo Kim };
101d5aa11bfSMilo Kim
1025b6850faSSebastian Reichel static const struct mfd_cell lm3695_devices[] = {
103d5aa11bfSMilo Kim {
104d5aa11bfSMilo Kim .name = "ti-lmu-backlight",
105d5aa11bfSMilo Kim .id = LM3695,
106d5aa11bfSMilo Kim .of_compatible = "ti,lm3695-backlight",
107d5aa11bfSMilo Kim },
108d5aa11bfSMilo Kim };
109d5aa11bfSMilo Kim
1109c523efbSDan Murphy static const struct mfd_cell lm36274_devices[] = {
1119c523efbSDan Murphy LM363X_REGULATOR(LM36274_BOOST),
1129c523efbSDan Murphy LM363X_REGULATOR(LM36274_LDO_POS),
1139c523efbSDan Murphy LM363X_REGULATOR(LM36274_LDO_NEG),
114d5aa11bfSMilo Kim {
1159c523efbSDan Murphy .name = "lm36274-leds",
1169c523efbSDan Murphy .id = LM36274,
1179c523efbSDan Murphy .of_compatible = "ti,lm36274-backlight",
118d5aa11bfSMilo Kim },
119d5aa11bfSMilo Kim };
120d5aa11bfSMilo Kim
121d5aa11bfSMilo Kim #define TI_LMU_DATA(chip, max_reg) \
122d5aa11bfSMilo Kim static const struct ti_lmu_data chip##_data = \
123d5aa11bfSMilo Kim { \
124d5aa11bfSMilo Kim .cells = chip##_devices, \
125d5aa11bfSMilo Kim .num_cells = ARRAY_SIZE(chip##_devices),\
126d5aa11bfSMilo Kim .max_register = max_reg, \
127d5aa11bfSMilo Kim } \
128d5aa11bfSMilo Kim
129d5aa11bfSMilo Kim TI_LMU_DATA(lm3631, LM3631_MAX_REG);
130d5aa11bfSMilo Kim TI_LMU_DATA(lm3632, LM3632_MAX_REG);
131d5aa11bfSMilo Kim TI_LMU_DATA(lm3633, LM3633_MAX_REG);
132d5aa11bfSMilo Kim TI_LMU_DATA(lm3695, LM3695_MAX_REG);
1339c523efbSDan Murphy TI_LMU_DATA(lm36274, LM36274_MAX_REG);
134d5aa11bfSMilo Kim
ti_lmu_probe(struct i2c_client * cl)135e6a6b1d6SUwe Kleine-König static int ti_lmu_probe(struct i2c_client *cl)
136d5aa11bfSMilo Kim {
137e6a6b1d6SUwe Kleine-König const struct i2c_device_id *id = i2c_client_get_device_id(cl);
138d5aa11bfSMilo Kim struct device *dev = &cl->dev;
139d5aa11bfSMilo Kim const struct ti_lmu_data *data;
140d5aa11bfSMilo Kim struct regmap_config regmap_cfg;
141d5aa11bfSMilo Kim struct ti_lmu *lmu;
142d5aa11bfSMilo Kim int ret;
143d5aa11bfSMilo Kim
144d5aa11bfSMilo Kim /*
145d5aa11bfSMilo Kim * Get device specific data from of_match table.
146d5aa11bfSMilo Kim * This data is defined by using TI_LMU_DATA() macro.
147d5aa11bfSMilo Kim */
148697894b9SPavel Machek data = of_device_get_match_data(dev);
149697894b9SPavel Machek if (!data)
150697894b9SPavel Machek return -ENODEV;
151d5aa11bfSMilo Kim
152d5aa11bfSMilo Kim lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL);
153d5aa11bfSMilo Kim if (!lmu)
154d5aa11bfSMilo Kim return -ENOMEM;
155d5aa11bfSMilo Kim
156d5aa11bfSMilo Kim lmu->dev = &cl->dev;
157d5aa11bfSMilo Kim
158d5aa11bfSMilo Kim /* Setup regmap */
159d5aa11bfSMilo Kim memset(®map_cfg, 0, sizeof(struct regmap_config));
160d5aa11bfSMilo Kim regmap_cfg.reg_bits = 8;
161d5aa11bfSMilo Kim regmap_cfg.val_bits = 8;
162d5aa11bfSMilo Kim regmap_cfg.name = id->name;
163d5aa11bfSMilo Kim regmap_cfg.max_register = data->max_register;
164d5aa11bfSMilo Kim
165d5aa11bfSMilo Kim lmu->regmap = devm_regmap_init_i2c(cl, ®map_cfg);
166d5aa11bfSMilo Kim if (IS_ERR(lmu->regmap))
167d5aa11bfSMilo Kim return PTR_ERR(lmu->regmap);
168d5aa11bfSMilo Kim
169d5aa11bfSMilo Kim /* HW enable pin control and additional power up sequence if required */
1707a6a395bSPavel Machek lmu->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
1717a6a395bSPavel Machek if (IS_ERR(lmu->en_gpio)) {
1727a6a395bSPavel Machek ret = PTR_ERR(lmu->en_gpio);
1737a6a395bSPavel Machek dev_err(dev, "Can not request enable GPIO: %d\n", ret);
1747a6a395bSPavel Machek return ret;
1757a6a395bSPavel Machek }
1767a6a395bSPavel Machek
177d5aa11bfSMilo Kim ret = ti_lmu_enable_hw(lmu, id->driver_data);
178d5aa11bfSMilo Kim if (ret)
179d5aa11bfSMilo Kim return ret;
180d5aa11bfSMilo Kim
1817891d375SPavel Machek ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu);
1827891d375SPavel Machek if (ret)
1837891d375SPavel Machek return ret;
1847891d375SPavel Machek
185d5aa11bfSMilo Kim /*
186d5aa11bfSMilo Kim * Fault circuit(open/short) can be detected by ti-lmu-fault-monitor.
187d5aa11bfSMilo Kim * After fault detection is done, some devices should re-initialize
188d5aa11bfSMilo Kim * configuration. The notifier enables such kind of handling.
189d5aa11bfSMilo Kim */
190d5aa11bfSMilo Kim BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier);
191d5aa11bfSMilo Kim
192d5aa11bfSMilo Kim i2c_set_clientdata(cl, lmu);
193d5aa11bfSMilo Kim
1947891d375SPavel Machek return devm_mfd_add_devices(lmu->dev, 0, data->cells,
195d5aa11bfSMilo Kim data->num_cells, NULL, 0, NULL);
196d5aa11bfSMilo Kim }
197d5aa11bfSMilo Kim
198697894b9SPavel Machek static const struct of_device_id ti_lmu_of_match[] = {
199697894b9SPavel Machek { .compatible = "ti,lm3631", .data = &lm3631_data },
200697894b9SPavel Machek { .compatible = "ti,lm3632", .data = &lm3632_data },
201697894b9SPavel Machek { .compatible = "ti,lm3633", .data = &lm3633_data },
202697894b9SPavel Machek { .compatible = "ti,lm3695", .data = &lm3695_data },
2039c523efbSDan Murphy { .compatible = "ti,lm36274", .data = &lm36274_data },
204697894b9SPavel Machek { }
205697894b9SPavel Machek };
206697894b9SPavel Machek MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
207697894b9SPavel Machek
208d5aa11bfSMilo Kim static const struct i2c_device_id ti_lmu_ids[] = {
209d5aa11bfSMilo Kim { "lm3631", LM3631 },
210d5aa11bfSMilo Kim { "lm3632", LM3632 },
211d5aa11bfSMilo Kim { "lm3633", LM3633 },
212d5aa11bfSMilo Kim { "lm3695", LM3695 },
2139c523efbSDan Murphy { "lm36274", LM36274 },
214d5aa11bfSMilo Kim { }
215d5aa11bfSMilo Kim };
216d5aa11bfSMilo Kim MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
217d5aa11bfSMilo Kim
218d5aa11bfSMilo Kim static struct i2c_driver ti_lmu_driver = {
219*9816d859SUwe Kleine-König .probe = ti_lmu_probe,
220d5aa11bfSMilo Kim .driver = {
221d5aa11bfSMilo Kim .name = "ti-lmu",
222d5aa11bfSMilo Kim .of_match_table = ti_lmu_of_match,
223d5aa11bfSMilo Kim },
224d5aa11bfSMilo Kim .id_table = ti_lmu_ids,
225d5aa11bfSMilo Kim };
226d5aa11bfSMilo Kim
227d5aa11bfSMilo Kim module_i2c_driver(ti_lmu_driver);
228d5aa11bfSMilo Kim
229d5aa11bfSMilo Kim MODULE_DESCRIPTION("TI LMU MFD Core Driver");
230d5aa11bfSMilo Kim MODULE_AUTHOR("Milo Kim");
231d5aa11bfSMilo Kim MODULE_LICENSE("GPL v2");
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