ACPI: scan: Make acpi_bus_get_device() clear return pointer on error
[platform/kernel/linux-rpi.git] / drivers / mfd / ti-lmu.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * TI LMU (Lighting Management Unit) Core Driver
4  *
5  * Copyright 2017 Texas Instruments
6  *
7  * Author: Milo Kim <milo.kim@ti.com>
8  */
9
10 #include <linux/delay.h>
11 #include <linux/err.h>
12 #include <linux/gpio/consumer.h>
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>
21 #include <linux/slab.h>
22
23 struct ti_lmu_data {
24         const struct mfd_cell *cells;
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 {
31         if (lmu->en_gpio)
32                 gpiod_set_value(lmu->en_gpio, 1);
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
47 static void ti_lmu_disable_hw(void *data)
48 {
49         struct ti_lmu *lmu = data;
50         if (lmu->en_gpio)
51                 gpiod_set_value(lmu->en_gpio, 0);
52 }
53
54 #define LM363X_REGULATOR(_id)                   \
55 {                                               \
56         .name          = "lm363x-regulator",    \
57         .id            = _id,                   \
58         .of_compatible = "ti,lm363x-regulator", \
59 }                                               \
60
61 static const struct mfd_cell lm3631_devices[] = {
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
74 static const struct mfd_cell lm3632_devices[] = {
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
85 static const struct mfd_cell lm3633_devices[] = {
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
103 static const struct mfd_cell lm3695_devices[] = {
104         {
105                 .name          = "ti-lmu-backlight",
106                 .id            = LM3695,
107                 .of_compatible = "ti,lm3695-backlight",
108         },
109 };
110
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),
115         {
116                 .name          = "lm36274-leds",
117                 .id            = LM36274,
118                 .of_compatible = "ti,lm36274-backlight",
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
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);
134 TI_LMU_DATA(lm36274, LM36274_MAX_REG);
135
136 static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
137 {
138         struct device *dev = &cl->dev;
139         const struct ti_lmu_data *data;
140         struct regmap_config regmap_cfg;
141         struct ti_lmu *lmu;
142         int ret;
143
144         /*
145          * Get device specific data from of_match table.
146          * This data is defined by using TI_LMU_DATA() macro.
147          */
148         data = of_device_get_match_data(dev);
149         if (!data)
150                 return -ENODEV;
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(&regmap_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, &regmap_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 */
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
177         ret = ti_lmu_enable_hw(lmu, id->driver_data);
178         if (ret)
179                 return ret;
180
181         ret = devm_add_action_or_reset(dev, ti_lmu_disable_hw, lmu);
182         if (ret)
183                 return ret;
184
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
194         return devm_mfd_add_devices(lmu->dev, 0, data->cells,
195                                     data->num_cells, NULL, 0, NULL);
196 }
197
198 static const struct of_device_id ti_lmu_of_match[] = {
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 },
203         { .compatible = "ti,lm36274", .data = &lm36274_data },
204         { }
205 };
206 MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
207
208 static const struct i2c_device_id ti_lmu_ids[] = {
209         { "lm3631", LM3631 },
210         { "lm3632", LM3632 },
211         { "lm3633", LM3633 },
212         { "lm3695", LM3695 },
213         { "lm36274", LM36274 },
214         { }
215 };
216 MODULE_DEVICE_TABLE(i2c, ti_lmu_ids);
217
218 static struct i2c_driver ti_lmu_driver = {
219         .probe = ti_lmu_probe,
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");