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d5aa11bf MK |
1 | /* |
2 | * TI LMU (Lighting Management Unit) Core Driver | |
3 | * | |
4 | * Copyright 2017 Texas Instruments | |
5 | * | |
6 | * Author: Milo Kim <milo.kim@ti.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/delay.h> | |
14 | #include <linux/err.h> | |
7a6a395b | 15 | #include <linux/gpio/consumer.h> |
d5aa11bf MK |
16 | #include <linux/i2c.h> |
17 | #include <linux/kernel.h> | |
18 | #include <linux/mfd/core.h> | |
19 | #include <linux/mfd/ti-lmu.h> | |
20 | #include <linux/mfd/ti-lmu-register.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/of.h> | |
23 | #include <linux/of_device.h> | |
d5aa11bf MK |
24 | #include <linux/slab.h> |
25 | ||
26 | struct ti_lmu_data { | |
5b6850fa | 27 | const struct mfd_cell *cells; |
d5aa11bf MK |
28 | int num_cells; |
29 | unsigned int max_register; | |
30 | }; | |
31 | ||
32 | static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id) | |
33 | { | |
7a6a395b PM |
34 | if (lmu->en_gpio) |
35 | gpiod_set_value(lmu->en_gpio, 1); | |
d5aa11bf MK |
36 | |
37 | /* Delay about 1ms after HW enable pin control */ | |
38 | usleep_range(1000, 1500); | |
39 | ||
40 | /* LM3631 has additional power up sequence - enable LCD_EN bit. */ | |
41 | if (id == LM3631) { | |
42 | return regmap_update_bits(lmu->regmap, LM3631_REG_DEVCTRL, | |
43 | LM3631_LCD_EN_MASK, | |
44 | LM3631_LCD_EN_MASK); | |
45 | } | |
46 | ||
47 | return 0; | |
48 | } | |
49 | ||
7891d375 | 50 | static void ti_lmu_disable_hw(void *data) |
d5aa11bf | 51 | { |
7891d375 | 52 | struct ti_lmu *lmu = data; |
7a6a395b PM |
53 | if (lmu->en_gpio) |
54 | gpiod_set_value(lmu->en_gpio, 0); | |
d5aa11bf MK |
55 | } |
56 | ||
5b6850fa | 57 | static const struct mfd_cell lm3532_devices[] = { |
d5aa11bf MK |
58 | { |
59 | .name = "ti-lmu-backlight", | |
60 | .id = LM3532, | |
61 | .of_compatible = "ti,lm3532-backlight", | |
62 | }, | |
63 | }; | |
64 | ||
65 | #define LM363X_REGULATOR(_id) \ | |
66 | { \ | |
67 | .name = "lm363x-regulator", \ | |
68 | .id = _id, \ | |
69 | .of_compatible = "ti,lm363x-regulator", \ | |
70 | } \ | |
71 | ||
5b6850fa | 72 | static const struct mfd_cell lm3631_devices[] = { |
d5aa11bf MK |
73 | LM363X_REGULATOR(LM3631_BOOST), |
74 | LM363X_REGULATOR(LM3631_LDO_CONT), | |
75 | LM363X_REGULATOR(LM3631_LDO_OREF), | |
76 | LM363X_REGULATOR(LM3631_LDO_POS), | |
77 | LM363X_REGULATOR(LM3631_LDO_NEG), | |
78 | { | |
79 | .name = "ti-lmu-backlight", | |
80 | .id = LM3631, | |
81 | .of_compatible = "ti,lm3631-backlight", | |
82 | }, | |
83 | }; | |
84 | ||
5b6850fa | 85 | static const struct mfd_cell lm3632_devices[] = { |
d5aa11bf MK |
86 | LM363X_REGULATOR(LM3632_BOOST), |
87 | LM363X_REGULATOR(LM3632_LDO_POS), | |
88 | LM363X_REGULATOR(LM3632_LDO_NEG), | |
89 | { | |
90 | .name = "ti-lmu-backlight", | |
91 | .id = LM3632, | |
92 | .of_compatible = "ti,lm3632-backlight", | |
93 | }, | |
94 | }; | |
95 | ||
5b6850fa | 96 | static const struct mfd_cell lm3633_devices[] = { |
d5aa11bf MK |
97 | { |
98 | .name = "ti-lmu-backlight", | |
99 | .id = LM3633, | |
100 | .of_compatible = "ti,lm3633-backlight", | |
101 | }, | |
102 | { | |
103 | .name = "lm3633-leds", | |
104 | .of_compatible = "ti,lm3633-leds", | |
105 | }, | |
106 | /* Monitoring driver for open/short circuit detection */ | |
107 | { | |
108 | .name = "ti-lmu-fault-monitor", | |
109 | .id = LM3633, | |
110 | .of_compatible = "ti,lm3633-fault-monitor", | |
111 | }, | |
112 | }; | |
113 | ||
5b6850fa | 114 | static const struct mfd_cell lm3695_devices[] = { |
d5aa11bf MK |
115 | { |
116 | .name = "ti-lmu-backlight", | |
117 | .id = LM3695, | |
118 | .of_compatible = "ti,lm3695-backlight", | |
119 | }, | |
120 | }; | |
121 | ||
5b6850fa | 122 | static const struct mfd_cell lm3697_devices[] = { |
d5aa11bf MK |
123 | { |
124 | .name = "ti-lmu-backlight", | |
125 | .id = LM3697, | |
126 | .of_compatible = "ti,lm3697-backlight", | |
127 | }, | |
128 | /* Monitoring driver for open/short circuit detection */ | |
129 | { | |
130 | .name = "ti-lmu-fault-monitor", | |
131 | .id = LM3697, | |
132 | .of_compatible = "ti,lm3697-fault-monitor", | |
133 | }, | |
134 | }; | |
135 | ||
136 | #define TI_LMU_DATA(chip, max_reg) \ | |
137 | static const struct ti_lmu_data chip##_data = \ | |
138 | { \ | |
139 | .cells = chip##_devices, \ | |
140 | .num_cells = ARRAY_SIZE(chip##_devices),\ | |
141 | .max_register = max_reg, \ | |
142 | } \ | |
143 | ||
144 | TI_LMU_DATA(lm3532, LM3532_MAX_REG); | |
145 | TI_LMU_DATA(lm3631, LM3631_MAX_REG); | |
146 | TI_LMU_DATA(lm3632, LM3632_MAX_REG); | |
147 | TI_LMU_DATA(lm3633, LM3633_MAX_REG); | |
148 | TI_LMU_DATA(lm3695, LM3695_MAX_REG); | |
149 | TI_LMU_DATA(lm3697, LM3697_MAX_REG); | |
150 | ||
d5aa11bf MK |
151 | static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id) |
152 | { | |
153 | struct device *dev = &cl->dev; | |
d5aa11bf MK |
154 | const struct ti_lmu_data *data; |
155 | struct regmap_config regmap_cfg; | |
156 | struct ti_lmu *lmu; | |
157 | int ret; | |
158 | ||
d5aa11bf MK |
159 | /* |
160 | * Get device specific data from of_match table. | |
161 | * This data is defined by using TI_LMU_DATA() macro. | |
162 | */ | |
697894b9 PM |
163 | data = of_device_get_match_data(dev); |
164 | if (!data) | |
165 | return -ENODEV; | |
d5aa11bf MK |
166 | |
167 | lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL); | |
168 | if (!lmu) | |
169 | return -ENOMEM; | |
170 | ||
171 | lmu->dev = &cl->dev; | |
172 | ||
173 | /* Setup regmap */ | |
174 | memset(®map_cfg, 0, sizeof(struct regmap_config)); | |
175 | regmap_cfg.reg_bits = 8; | |
176 | regmap_cfg.val_bits = 8; | |
177 | regmap_cfg.name = id->name; | |
178 | regmap_cfg.max_register = data->max_register; | |
179 | ||
180 | lmu->regmap = devm_regmap_init_i2c(cl, ®map_cfg); | |
181 | if (IS_ERR(lmu->regmap)) | |
182 | return PTR_ERR(lmu->regmap); | |
183 | ||
184 | /* HW enable pin control and additional power up sequence if required */ | |
7a6a395b PM |
185 | lmu->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH); |
186 | if (IS_ERR(lmu->en_gpio)) { | |
187 | ret = PTR_ERR(lmu->en_gpio); | |
188 | dev_err(dev, "Can not request enable GPIO: %d\n", ret); | |
189 | return ret; | |
190 | } | |
191 | ||
d5aa11bf MK |
192 | ret = ti_lmu_enable_hw(lmu, id->driver_data); |
193 | if (ret) | |
194 | return ret; | |
195 | ||
7891d375 PM |
196 | ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu); |
197 | if (ret) | |
198 | return ret; | |
199 | ||
d5aa11bf MK |
200 | /* |
201 | * Fault circuit(open/short) can be detected by ti-lmu-fault-monitor. | |
202 | * After fault detection is done, some devices should re-initialize | |
203 | * configuration. The notifier enables such kind of handling. | |
204 | */ | |
205 | BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier); | |
206 | ||
207 | i2c_set_clientdata(cl, lmu); | |
208 | ||
7891d375 PM |
209 | return devm_mfd_add_devices(lmu->dev, 0, data->cells, |
210 | data->num_cells, NULL, 0, NULL); | |
d5aa11bf MK |
211 | } |
212 | ||
697894b9 PM |
213 | static const struct of_device_id ti_lmu_of_match[] = { |
214 | { .compatible = "ti,lm3532", .data = &lm3532_data }, | |
215 | { .compatible = "ti,lm3631", .data = &lm3631_data }, | |
216 | { .compatible = "ti,lm3632", .data = &lm3632_data }, | |
217 | { .compatible = "ti,lm3633", .data = &lm3633_data }, | |
218 | { .compatible = "ti,lm3695", .data = &lm3695_data }, | |
219 | { .compatible = "ti,lm3697", .data = &lm3697_data }, | |
220 | { } | |
221 | }; | |
222 | MODULE_DEVICE_TABLE(of, ti_lmu_of_match); | |
223 | ||
d5aa11bf MK |
224 | static const struct i2c_device_id ti_lmu_ids[] = { |
225 | { "lm3532", LM3532 }, | |
226 | { "lm3631", LM3631 }, | |
227 | { "lm3632", LM3632 }, | |
228 | { "lm3633", LM3633 }, | |
229 | { "lm3695", LM3695 }, | |
230 | { "lm3697", LM3697 }, | |
231 | { } | |
232 | }; | |
233 | MODULE_DEVICE_TABLE(i2c, ti_lmu_ids); | |
234 | ||
235 | static struct i2c_driver ti_lmu_driver = { | |
236 | .probe = ti_lmu_probe, | |
d5aa11bf MK |
237 | .driver = { |
238 | .name = "ti-lmu", | |
239 | .of_match_table = ti_lmu_of_match, | |
240 | }, | |
241 | .id_table = ti_lmu_ids, | |
242 | }; | |
243 | ||
244 | module_i2c_driver(ti_lmu_driver); | |
245 | ||
246 | MODULE_DESCRIPTION("TI LMU MFD Core Driver"); | |
247 | MODULE_AUTHOR("Milo Kim"); | |
248 | MODULE_LICENSE("GPL v2"); |