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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d5aa11bf MK |
2 | /* |
3 | * TI LMU (Lighting Management Unit) Core Driver | |
4 | * | |
5 | * Copyright 2017 Texas Instruments | |
6 | * | |
7 | * Author: Milo Kim <milo.kim@ti.com> | |
d5aa11bf MK |
8 | */ |
9 | ||
10 | #include <linux/delay.h> | |
11 | #include <linux/err.h> | |
7a6a395b | 12 | #include <linux/gpio/consumer.h> |
d5aa11bf MK |
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> | |
d5aa11bf MK |
21 | #include <linux/slab.h> |
22 | ||
23 | struct ti_lmu_data { | |
5b6850fa | 24 | const struct mfd_cell *cells; |
d5aa11bf MK |
25 | int num_cells; |
26 | unsigned int max_register; | |
27 | }; | |
28 | ||
29 | static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id) | |
30 | { | |
7a6a395b PM |
31 | if (lmu->en_gpio) |
32 | gpiod_set_value(lmu->en_gpio, 1); | |
d5aa11bf MK |
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 | ||
7891d375 | 47 | static void ti_lmu_disable_hw(void *data) |
d5aa11bf | 48 | { |
7891d375 | 49 | struct ti_lmu *lmu = data; |
7a6a395b PM |
50 | if (lmu->en_gpio) |
51 | gpiod_set_value(lmu->en_gpio, 0); | |
d5aa11bf MK |
52 | } |
53 | ||
d5aa11bf MK |
54 | #define LM363X_REGULATOR(_id) \ |
55 | { \ | |
56 | .name = "lm363x-regulator", \ | |
57 | .id = _id, \ | |
58 | .of_compatible = "ti,lm363x-regulator", \ | |
59 | } \ | |
60 | ||
5b6850fa | 61 | static const struct mfd_cell lm3631_devices[] = { |
d5aa11bf MK |
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 | ||
5b6850fa | 74 | static const struct mfd_cell lm3632_devices[] = { |
d5aa11bf MK |
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 | ||
5b6850fa | 85 | static const struct mfd_cell lm3633_devices[] = { |
d5aa11bf MK |
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 | ||
5b6850fa | 103 | static const struct mfd_cell lm3695_devices[] = { |
d5aa11bf MK |
104 | { |
105 | .name = "ti-lmu-backlight", | |
106 | .id = LM3695, | |
107 | .of_compatible = "ti,lm3695-backlight", | |
108 | }, | |
109 | }; | |
110 | ||
9c523efb DM |
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), | |
d5aa11bf | 115 | { |
9c523efb DM |
116 | .name = "lm36274-leds", |
117 | .id = LM36274, | |
118 | .of_compatible = "ti,lm36274-backlight", | |
d5aa11bf MK |
119 | }, |
120 | }; | |
121 | ||
122 | #define TI_LMU_DATA(chip, max_reg) \ | |
123 | static 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 | ||
d5aa11bf MK |
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); | |
9c523efb | 134 | TI_LMU_DATA(lm36274, LM36274_MAX_REG); |
d5aa11bf | 135 | |
d5aa11bf MK |
136 | static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id) |
137 | { | |
138 | struct device *dev = &cl->dev; | |
d5aa11bf MK |
139 | const struct ti_lmu_data *data; |
140 | struct regmap_config regmap_cfg; | |
141 | struct ti_lmu *lmu; | |
142 | int ret; | |
143 | ||
d5aa11bf MK |
144 | /* |
145 | * Get device specific data from of_match table. | |
146 | * This data is defined by using TI_LMU_DATA() macro. | |
147 | */ | |
697894b9 PM |
148 | data = of_device_get_match_data(dev); |
149 | if (!data) | |
150 | return -ENODEV; | |
d5aa11bf MK |
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(®map_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, ®map_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 */ | |
7a6a395b PM |
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 | ||
d5aa11bf MK |
177 | ret = ti_lmu_enable_hw(lmu, id->driver_data); |
178 | if (ret) | |
179 | return ret; | |
180 | ||
7891d375 PM |
181 | ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu); |
182 | if (ret) | |
183 | return ret; | |
184 | ||
d5aa11bf MK |
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 | ||
7891d375 PM |
194 | return devm_mfd_add_devices(lmu->dev, 0, data->cells, |
195 | data->num_cells, NULL, 0, NULL); | |
d5aa11bf MK |
196 | } |
197 | ||
697894b9 | 198 | static const struct of_device_id ti_lmu_of_match[] = { |
697894b9 PM |
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 }, | |
9c523efb | 203 | { .compatible = "ti,lm36274", .data = &lm36274_data }, |
697894b9 PM |
204 | { } |
205 | }; | |
206 | MODULE_DEVICE_TABLE(of, ti_lmu_of_match); | |
207 | ||
d5aa11bf | 208 | static const struct i2c_device_id ti_lmu_ids[] = { |
d5aa11bf MK |
209 | { "lm3631", LM3631 }, |
210 | { "lm3632", LM3632 }, | |
211 | { "lm3633", LM3633 }, | |
212 | { "lm3695", LM3695 }, | |
9c523efb | 213 | { "lm36274", LM36274 }, |
d5aa11bf MK |
214 | { } |
215 | }; | |
216 | MODULE_DEVICE_TABLE(i2c, ti_lmu_ids); | |
217 | ||
218 | static struct i2c_driver ti_lmu_driver = { | |
219 | .probe = ti_lmu_probe, | |
d5aa11bf MK |
220 | .driver = { |
221 | .name = "ti-lmu", | |
222 | .of_match_table = ti_lmu_of_match, | |
223 | }, | |
224 | .id_table = ti_lmu_ids, | |
225 | }; | |
226 | ||
227 | module_i2c_driver(ti_lmu_driver); | |
228 | ||
229 | MODULE_DESCRIPTION("TI LMU MFD Core Driver"); | |
230 | MODULE_AUTHOR("Milo Kim"); | |
231 | MODULE_LICENSE("GPL v2"); |