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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> | |
15 | #include <linux/gpio.h> | |
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> | |
24 | #include <linux/of_gpio.h> | |
25 | #include <linux/slab.h> | |
26 | ||
27 | struct ti_lmu_data { | |
28 | struct mfd_cell *cells; | |
29 | int num_cells; | |
30 | unsigned int max_register; | |
31 | }; | |
32 | ||
33 | static int ti_lmu_enable_hw(struct ti_lmu *lmu, enum ti_lmu_id id) | |
34 | { | |
35 | int ret; | |
36 | ||
37 | if (gpio_is_valid(lmu->en_gpio)) { | |
38 | ret = devm_gpio_request_one(lmu->dev, lmu->en_gpio, | |
39 | GPIOF_OUT_INIT_HIGH, "lmu_hwen"); | |
40 | if (ret) { | |
41 | dev_err(lmu->dev, "Can not request enable GPIO: %d\n", | |
42 | ret); | |
43 | return ret; | |
44 | } | |
45 | } | |
46 | ||
47 | /* Delay about 1ms after HW enable pin control */ | |
48 | usleep_range(1000, 1500); | |
49 | ||
50 | /* LM3631 has additional power up sequence - enable LCD_EN bit. */ | |
51 | if (id == LM3631) { | |
52 | return regmap_update_bits(lmu->regmap, LM3631_REG_DEVCTRL, | |
53 | LM3631_LCD_EN_MASK, | |
54 | LM3631_LCD_EN_MASK); | |
55 | } | |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | static void ti_lmu_disable_hw(struct ti_lmu *lmu) | |
61 | { | |
62 | if (gpio_is_valid(lmu->en_gpio)) | |
63 | gpio_set_value(lmu->en_gpio, 0); | |
64 | } | |
65 | ||
66 | static struct mfd_cell lm3532_devices[] = { | |
67 | { | |
68 | .name = "ti-lmu-backlight", | |
69 | .id = LM3532, | |
70 | .of_compatible = "ti,lm3532-backlight", | |
71 | }, | |
72 | }; | |
73 | ||
74 | #define LM363X_REGULATOR(_id) \ | |
75 | { \ | |
76 | .name = "lm363x-regulator", \ | |
77 | .id = _id, \ | |
78 | .of_compatible = "ti,lm363x-regulator", \ | |
79 | } \ | |
80 | ||
81 | static struct mfd_cell lm3631_devices[] = { | |
82 | LM363X_REGULATOR(LM3631_BOOST), | |
83 | LM363X_REGULATOR(LM3631_LDO_CONT), | |
84 | LM363X_REGULATOR(LM3631_LDO_OREF), | |
85 | LM363X_REGULATOR(LM3631_LDO_POS), | |
86 | LM363X_REGULATOR(LM3631_LDO_NEG), | |
87 | { | |
88 | .name = "ti-lmu-backlight", | |
89 | .id = LM3631, | |
90 | .of_compatible = "ti,lm3631-backlight", | |
91 | }, | |
92 | }; | |
93 | ||
94 | static struct mfd_cell lm3632_devices[] = { | |
95 | LM363X_REGULATOR(LM3632_BOOST), | |
96 | LM363X_REGULATOR(LM3632_LDO_POS), | |
97 | LM363X_REGULATOR(LM3632_LDO_NEG), | |
98 | { | |
99 | .name = "ti-lmu-backlight", | |
100 | .id = LM3632, | |
101 | .of_compatible = "ti,lm3632-backlight", | |
102 | }, | |
103 | }; | |
104 | ||
105 | static struct mfd_cell lm3633_devices[] = { | |
106 | { | |
107 | .name = "ti-lmu-backlight", | |
108 | .id = LM3633, | |
109 | .of_compatible = "ti,lm3633-backlight", | |
110 | }, | |
111 | { | |
112 | .name = "lm3633-leds", | |
113 | .of_compatible = "ti,lm3633-leds", | |
114 | }, | |
115 | /* Monitoring driver for open/short circuit detection */ | |
116 | { | |
117 | .name = "ti-lmu-fault-monitor", | |
118 | .id = LM3633, | |
119 | .of_compatible = "ti,lm3633-fault-monitor", | |
120 | }, | |
121 | }; | |
122 | ||
123 | static struct mfd_cell lm3695_devices[] = { | |
124 | { | |
125 | .name = "ti-lmu-backlight", | |
126 | .id = LM3695, | |
127 | .of_compatible = "ti,lm3695-backlight", | |
128 | }, | |
129 | }; | |
130 | ||
131 | static struct mfd_cell lm3697_devices[] = { | |
132 | { | |
133 | .name = "ti-lmu-backlight", | |
134 | .id = LM3697, | |
135 | .of_compatible = "ti,lm3697-backlight", | |
136 | }, | |
137 | /* Monitoring driver for open/short circuit detection */ | |
138 | { | |
139 | .name = "ti-lmu-fault-monitor", | |
140 | .id = LM3697, | |
141 | .of_compatible = "ti,lm3697-fault-monitor", | |
142 | }, | |
143 | }; | |
144 | ||
145 | #define TI_LMU_DATA(chip, max_reg) \ | |
146 | static const struct ti_lmu_data chip##_data = \ | |
147 | { \ | |
148 | .cells = chip##_devices, \ | |
149 | .num_cells = ARRAY_SIZE(chip##_devices),\ | |
150 | .max_register = max_reg, \ | |
151 | } \ | |
152 | ||
153 | TI_LMU_DATA(lm3532, LM3532_MAX_REG); | |
154 | TI_LMU_DATA(lm3631, LM3631_MAX_REG); | |
155 | TI_LMU_DATA(lm3632, LM3632_MAX_REG); | |
156 | TI_LMU_DATA(lm3633, LM3633_MAX_REG); | |
157 | TI_LMU_DATA(lm3695, LM3695_MAX_REG); | |
158 | TI_LMU_DATA(lm3697, LM3697_MAX_REG); | |
159 | ||
160 | static const struct of_device_id ti_lmu_of_match[] = { | |
161 | { .compatible = "ti,lm3532", .data = &lm3532_data }, | |
162 | { .compatible = "ti,lm3631", .data = &lm3631_data }, | |
163 | { .compatible = "ti,lm3632", .data = &lm3632_data }, | |
164 | { .compatible = "ti,lm3633", .data = &lm3633_data }, | |
165 | { .compatible = "ti,lm3695", .data = &lm3695_data }, | |
166 | { .compatible = "ti,lm3697", .data = &lm3697_data }, | |
167 | { } | |
168 | }; | |
169 | MODULE_DEVICE_TABLE(of, ti_lmu_of_match); | |
170 | ||
171 | static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id) | |
172 | { | |
173 | struct device *dev = &cl->dev; | |
174 | const struct of_device_id *match; | |
175 | const struct ti_lmu_data *data; | |
176 | struct regmap_config regmap_cfg; | |
177 | struct ti_lmu *lmu; | |
178 | int ret; | |
179 | ||
180 | match = of_match_device(ti_lmu_of_match, dev); | |
181 | if (!match) | |
182 | return -ENODEV; | |
183 | /* | |
184 | * Get device specific data from of_match table. | |
185 | * This data is defined by using TI_LMU_DATA() macro. | |
186 | */ | |
187 | data = (struct ti_lmu_data *)match->data; | |
188 | ||
189 | lmu = devm_kzalloc(dev, sizeof(*lmu), GFP_KERNEL); | |
190 | if (!lmu) | |
191 | return -ENOMEM; | |
192 | ||
193 | lmu->dev = &cl->dev; | |
194 | ||
195 | /* Setup regmap */ | |
196 | memset(®map_cfg, 0, sizeof(struct regmap_config)); | |
197 | regmap_cfg.reg_bits = 8; | |
198 | regmap_cfg.val_bits = 8; | |
199 | regmap_cfg.name = id->name; | |
200 | regmap_cfg.max_register = data->max_register; | |
201 | ||
202 | lmu->regmap = devm_regmap_init_i2c(cl, ®map_cfg); | |
203 | if (IS_ERR(lmu->regmap)) | |
204 | return PTR_ERR(lmu->regmap); | |
205 | ||
206 | /* HW enable pin control and additional power up sequence if required */ | |
207 | lmu->en_gpio = of_get_named_gpio(dev->of_node, "enable-gpios", 0); | |
208 | ret = ti_lmu_enable_hw(lmu, id->driver_data); | |
209 | if (ret) | |
210 | return ret; | |
211 | ||
212 | /* | |
213 | * Fault circuit(open/short) can be detected by ti-lmu-fault-monitor. | |
214 | * After fault detection is done, some devices should re-initialize | |
215 | * configuration. The notifier enables such kind of handling. | |
216 | */ | |
217 | BLOCKING_INIT_NOTIFIER_HEAD(&lmu->notifier); | |
218 | ||
219 | i2c_set_clientdata(cl, lmu); | |
220 | ||
221 | return mfd_add_devices(lmu->dev, 0, data->cells, | |
222 | data->num_cells, NULL, 0, NULL); | |
223 | } | |
224 | ||
225 | static int ti_lmu_remove(struct i2c_client *cl) | |
226 | { | |
227 | struct ti_lmu *lmu = i2c_get_clientdata(cl); | |
228 | ||
229 | ti_lmu_disable_hw(lmu); | |
230 | mfd_remove_devices(lmu->dev); | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static const struct i2c_device_id ti_lmu_ids[] = { | |
235 | { "lm3532", LM3532 }, | |
236 | { "lm3631", LM3631 }, | |
237 | { "lm3632", LM3632 }, | |
238 | { "lm3633", LM3633 }, | |
239 | { "lm3695", LM3695 }, | |
240 | { "lm3697", LM3697 }, | |
241 | { } | |
242 | }; | |
243 | MODULE_DEVICE_TABLE(i2c, ti_lmu_ids); | |
244 | ||
245 | static struct i2c_driver ti_lmu_driver = { | |
246 | .probe = ti_lmu_probe, | |
247 | .remove = ti_lmu_remove, | |
248 | .driver = { | |
249 | .name = "ti-lmu", | |
250 | .of_match_table = ti_lmu_of_match, | |
251 | }, | |
252 | .id_table = ti_lmu_ids, | |
253 | }; | |
254 | ||
255 | module_i2c_driver(ti_lmu_driver); | |
256 | ||
257 | MODULE_DESCRIPTION("TI LMU MFD Core Driver"); | |
258 | MODULE_AUTHOR("Milo Kim"); | |
259 | MODULE_LICENSE("GPL v2"); |