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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 | ||
5b6850fa | 111 | static const struct mfd_cell lm3697_devices[] = { |
d5aa11bf MK |
112 | { |
113 | .name = "ti-lmu-backlight", | |
114 | .id = LM3697, | |
115 | .of_compatible = "ti,lm3697-backlight", | |
116 | }, | |
117 | /* Monitoring driver for open/short circuit detection */ | |
118 | { | |
119 | .name = "ti-lmu-fault-monitor", | |
120 | .id = LM3697, | |
121 | .of_compatible = "ti,lm3697-fault-monitor", | |
122 | }, | |
123 | }; | |
124 | ||
125 | #define TI_LMU_DATA(chip, max_reg) \ | |
126 | static const struct ti_lmu_data chip##_data = \ | |
127 | { \ | |
128 | .cells = chip##_devices, \ | |
129 | .num_cells = ARRAY_SIZE(chip##_devices),\ | |
130 | .max_register = max_reg, \ | |
131 | } \ | |
132 | ||
d5aa11bf MK |
133 | TI_LMU_DATA(lm3631, LM3631_MAX_REG); |
134 | TI_LMU_DATA(lm3632, LM3632_MAX_REG); | |
135 | TI_LMU_DATA(lm3633, LM3633_MAX_REG); | |
136 | TI_LMU_DATA(lm3695, LM3695_MAX_REG); | |
137 | TI_LMU_DATA(lm3697, LM3697_MAX_REG); | |
138 | ||
d5aa11bf MK |
139 | static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id) |
140 | { | |
141 | struct device *dev = &cl->dev; | |
d5aa11bf MK |
142 | const struct ti_lmu_data *data; |
143 | struct regmap_config regmap_cfg; | |
144 | struct ti_lmu *lmu; | |
145 | int ret; | |
146 | ||
d5aa11bf MK |
147 | /* |
148 | * Get device specific data from of_match table. | |
149 | * This data is defined by using TI_LMU_DATA() macro. | |
150 | */ | |
697894b9 PM |
151 | data = of_device_get_match_data(dev); |
152 | if (!data) | |
153 | return -ENODEV; | |
d5aa11bf MK |
154 | |
155 | lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL); | |
156 | if (!lmu) | |
157 | return -ENOMEM; | |
158 | ||
159 | lmu->dev = &cl->dev; | |
160 | ||
161 | /* Setup regmap */ | |
162 | memset(®map_cfg, 0, sizeof(struct regmap_config)); | |
163 | regmap_cfg.reg_bits = 8; | |
164 | regmap_cfg.val_bits = 8; | |
165 | regmap_cfg.name = id->name; | |
166 | regmap_cfg.max_register = data->max_register; | |
167 | ||
168 | lmu->regmap = devm_regmap_init_i2c(cl, ®map_cfg); | |
169 | if (IS_ERR(lmu->regmap)) | |
170 | return PTR_ERR(lmu->regmap); | |
171 | ||
172 | /* HW enable pin control and additional power up sequence if required */ | |
7a6a395b PM |
173 | lmu->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH); |
174 | if (IS_ERR(lmu->en_gpio)) { | |
175 | ret = PTR_ERR(lmu->en_gpio); | |
176 | dev_err(dev, "Can not request enable GPIO: %d\n", ret); | |
177 | return ret; | |
178 | } | |
179 | ||
d5aa11bf MK |
180 | ret = ti_lmu_enable_hw(lmu, id->driver_data); |
181 | if (ret) | |
182 | return ret; | |
183 | ||
7891d375 PM |
184 | ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu); |
185 | if (ret) | |
186 | return ret; | |
187 | ||
d5aa11bf MK |
188 | /* |
189 | * Fault circuit(open/short) can be detected by ti-lmu-fault-monitor. | |
190 | * After fault detection is done, some devices should re-initialize | |
191 | * configuration. The notifier enables such kind of handling. | |
192 | */ | |
193 | BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier); | |
194 | ||
195 | i2c_set_clientdata(cl, lmu); | |
196 | ||
7891d375 PM |
197 | return devm_mfd_add_devices(lmu->dev, 0, data->cells, |
198 | data->num_cells, NULL, 0, NULL); | |
d5aa11bf MK |
199 | } |
200 | ||
697894b9 | 201 | static const struct of_device_id ti_lmu_of_match[] = { |
697894b9 PM |
202 | { .compatible = "ti,lm3631", .data = &lm3631_data }, |
203 | { .compatible = "ti,lm3632", .data = &lm3632_data }, | |
204 | { .compatible = "ti,lm3633", .data = &lm3633_data }, | |
205 | { .compatible = "ti,lm3695", .data = &lm3695_data }, | |
206 | { .compatible = "ti,lm3697", .data = &lm3697_data }, | |
207 | { } | |
208 | }; | |
209 | MODULE_DEVICE_TABLE(of, ti_lmu_of_match); | |
210 | ||
d5aa11bf | 211 | static const struct i2c_device_id ti_lmu_ids[] = { |
d5aa11bf MK |
212 | { "lm3631", LM3631 }, |
213 | { "lm3632", LM3632 }, | |
214 | { "lm3633", LM3633 }, | |
215 | { "lm3695", LM3695 }, | |
216 | { "lm3697", LM3697 }, | |
217 | { } | |
218 | }; | |
219 | MODULE_DEVICE_TABLE(i2c, ti_lmu_ids); | |
220 | ||
221 | static struct i2c_driver ti_lmu_driver = { | |
222 | .probe = ti_lmu_probe, | |
d5aa11bf MK |
223 | .driver = { |
224 | .name = "ti-lmu", | |
225 | .of_match_table = ti_lmu_of_match, | |
226 | }, | |
227 | .id_table = ti_lmu_ids, | |
228 | }; | |
229 | ||
230 | module_i2c_driver(ti_lmu_driver); | |
231 | ||
232 | MODULE_DESCRIPTION("TI LMU MFD Core Driver"); | |
233 | MODULE_AUTHOR("Milo Kim"); | |
234 | MODULE_LICENSE("GPL v2"); |