1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * TI LP8788 MFD - core interface
4 *
5 * Copyright 2012 Texas Instruments
6 *
7 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
8 */
9
10 #include <linux/err.h>
11 #include <linux/i2c.h>
12 #include <linux/mfd/core.h>
13 #include <linux/mfd/lp8788.h>
14 #include <linux/module.h>
15 #include <linux/slab.h>
16
17 #define MAX_LP8788_REGISTERS 0xA2
18
19 #define MFD_DEV_SIMPLE(_name) \
20 { \
21 .name = LP8788_DEV_##_name, \
22 }
23
24 #define MFD_DEV_WITH_ID(_name, _id) \
25 { \
26 .name = LP8788_DEV_##_name, \
27 .id = _id, \
28 }
29
30 #define MFD_DEV_WITH_RESOURCE(_name, _resource, num_resource) \
31 { \
32 .name = LP8788_DEV_##_name, \
33 .resources = _resource, \
34 .num_resources = num_resource, \
35 }
36
37 static const struct resource chg_irqs[] = {
38 /* Charger Interrupts */
39 {
40 .start = LP8788_INT_CHG_INPUT_STATE,
41 .end = LP8788_INT_PRECHG_TIMEOUT,
42 .name = LP8788_CHG_IRQ,
43 .flags = IORESOURCE_IRQ,
44 },
45 /* Power Routing Switch Interrupts */
46 {
47 .start = LP8788_INT_ENTER_SYS_SUPPORT,
48 .end = LP8788_INT_EXIT_SYS_SUPPORT,
49 .name = LP8788_PRSW_IRQ,
50 .flags = IORESOURCE_IRQ,
51 },
52 /* Battery Interrupts */
53 {
54 .start = LP8788_INT_BATT_LOW,
55 .end = LP8788_INT_NO_BATT,
56 .name = LP8788_BATT_IRQ,
57 .flags = IORESOURCE_IRQ,
58 },
59 };
60
61 static const struct resource rtc_irqs[] = {
62 {
63 .start = LP8788_INT_RTC_ALARM1,
64 .end = LP8788_INT_RTC_ALARM2,
65 .name = LP8788_ALM_IRQ,
66 .flags = IORESOURCE_IRQ,
67 },
68 };
69
70 static const struct mfd_cell lp8788_devs[] = {
71 /* 4 bucks */
72 MFD_DEV_WITH_ID(BUCK, 1),
73 MFD_DEV_WITH_ID(BUCK, 2),
74 MFD_DEV_WITH_ID(BUCK, 3),
75 MFD_DEV_WITH_ID(BUCK, 4),
76
77 /* 12 digital ldos */
78 MFD_DEV_WITH_ID(DLDO, 1),
79 MFD_DEV_WITH_ID(DLDO, 2),
80 MFD_DEV_WITH_ID(DLDO, 3),
81 MFD_DEV_WITH_ID(DLDO, 4),
82 MFD_DEV_WITH_ID(DLDO, 5),
83 MFD_DEV_WITH_ID(DLDO, 6),
84 MFD_DEV_WITH_ID(DLDO, 7),
85 MFD_DEV_WITH_ID(DLDO, 8),
86 MFD_DEV_WITH_ID(DLDO, 9),
87 MFD_DEV_WITH_ID(DLDO, 10),
88 MFD_DEV_WITH_ID(DLDO, 11),
89 MFD_DEV_WITH_ID(DLDO, 12),
90
91 /* 10 analog ldos */
92 MFD_DEV_WITH_ID(ALDO, 1),
93 MFD_DEV_WITH_ID(ALDO, 2),
94 MFD_DEV_WITH_ID(ALDO, 3),
95 MFD_DEV_WITH_ID(ALDO, 4),
96 MFD_DEV_WITH_ID(ALDO, 5),
97 MFD_DEV_WITH_ID(ALDO, 6),
98 MFD_DEV_WITH_ID(ALDO, 7),
99 MFD_DEV_WITH_ID(ALDO, 8),
100 MFD_DEV_WITH_ID(ALDO, 9),
101 MFD_DEV_WITH_ID(ALDO, 10),
102
103 /* ADC */
104 MFD_DEV_SIMPLE(ADC),
105
106 /* battery charger */
107 MFD_DEV_WITH_RESOURCE(CHARGER, chg_irqs, ARRAY_SIZE(chg_irqs)),
108
109 /* rtc */
110 MFD_DEV_WITH_RESOURCE(RTC, rtc_irqs, ARRAY_SIZE(rtc_irqs)),
111
112 /* backlight */
113 MFD_DEV_SIMPLE(BACKLIGHT),
114
115 /* current sink for vibrator */
116 MFD_DEV_SIMPLE(VIBRATOR),
117
118 /* current sink for keypad LED */
119 MFD_DEV_SIMPLE(KEYLED),
120 };
121
lp8788_read_byte(struct lp8788 * lp,u8 reg,u8 * data)122 int lp8788_read_byte(struct lp8788 *lp, u8 reg, u8 *data)
123 {
124 int ret;
125 unsigned int val;
126
127 ret = regmap_read(lp->regmap, reg, &val);
128 if (ret < 0) {
129 dev_err(lp->dev, "failed to read 0x%.2x\n", reg);
130 return ret;
131 }
132
133 *data = (u8)val;
134 return 0;
135 }
136 EXPORT_SYMBOL_GPL(lp8788_read_byte);
137
lp8788_read_multi_bytes(struct lp8788 * lp,u8 reg,u8 * data,size_t count)138 int lp8788_read_multi_bytes(struct lp8788 *lp, u8 reg, u8 *data, size_t count)
139 {
140 return regmap_bulk_read(lp->regmap, reg, data, count);
141 }
142 EXPORT_SYMBOL_GPL(lp8788_read_multi_bytes);
143
lp8788_write_byte(struct lp8788 * lp,u8 reg,u8 data)144 int lp8788_write_byte(struct lp8788 *lp, u8 reg, u8 data)
145 {
146 return regmap_write(lp->regmap, reg, data);
147 }
148 EXPORT_SYMBOL_GPL(lp8788_write_byte);
149
lp8788_update_bits(struct lp8788 * lp,u8 reg,u8 mask,u8 data)150 int lp8788_update_bits(struct lp8788 *lp, u8 reg, u8 mask, u8 data)
151 {
152 return regmap_update_bits(lp->regmap, reg, mask, data);
153 }
154 EXPORT_SYMBOL_GPL(lp8788_update_bits);
155
lp8788_platform_init(struct lp8788 * lp)156 static int lp8788_platform_init(struct lp8788 *lp)
157 {
158 struct lp8788_platform_data *pdata = lp->pdata;
159
160 return (pdata && pdata->init_func) ? pdata->init_func(lp) : 0;
161 }
162
163 static const struct regmap_config lp8788_regmap_config = {
164 .reg_bits = 8,
165 .val_bits = 8,
166 .max_register = MAX_LP8788_REGISTERS,
167 };
168
lp8788_probe(struct i2c_client * cl)169 static int lp8788_probe(struct i2c_client *cl)
170 {
171 struct lp8788 *lp;
172 struct lp8788_platform_data *pdata = dev_get_platdata(&cl->dev);
173 int ret;
174
175 lp = devm_kzalloc(&cl->dev, sizeof(struct lp8788), GFP_KERNEL);
176 if (!lp)
177 return -ENOMEM;
178
179 lp->regmap = devm_regmap_init_i2c(cl, &lp8788_regmap_config);
180 if (IS_ERR(lp->regmap)) {
181 ret = PTR_ERR(lp->regmap);
182 dev_err(&cl->dev, "regmap init i2c err: %d\n", ret);
183 return ret;
184 }
185
186 lp->pdata = pdata;
187 lp->dev = &cl->dev;
188 i2c_set_clientdata(cl, lp);
189
190 ret = lp8788_platform_init(lp);
191 if (ret)
192 return ret;
193
194 ret = lp8788_irq_init(lp, cl->irq);
195 if (ret)
196 return ret;
197
198 ret = mfd_add_devices(lp->dev, -1, lp8788_devs,
199 ARRAY_SIZE(lp8788_devs), NULL, 0, NULL);
200 if (ret)
201 goto err_exit_irq;
202
203 return 0;
204
205 err_exit_irq:
206 lp8788_irq_exit(lp);
207 return ret;
208 }
209
lp8788_remove(struct i2c_client * cl)210 static void lp8788_remove(struct i2c_client *cl)
211 {
212 struct lp8788 *lp = i2c_get_clientdata(cl);
213
214 mfd_remove_devices(lp->dev);
215 lp8788_irq_exit(lp);
216 }
217
218 static const struct i2c_device_id lp8788_ids[] = {
219 {"lp8788", 0},
220 { }
221 };
222 MODULE_DEVICE_TABLE(i2c, lp8788_ids);
223
224 static struct i2c_driver lp8788_driver = {
225 .driver = {
226 .name = "lp8788",
227 },
228 .probe = lp8788_probe,
229 .remove = lp8788_remove,
230 .id_table = lp8788_ids,
231 };
232
lp8788_init(void)233 static int __init lp8788_init(void)
234 {
235 return i2c_add_driver(&lp8788_driver);
236 }
237 subsys_initcall(lp8788_init);
238
lp8788_exit(void)239 static void __exit lp8788_exit(void)
240 {
241 i2c_del_driver(&lp8788_driver);
242 }
243 module_exit(lp8788_exit);
244
245 MODULE_DESCRIPTION("TI LP8788 MFD Driver");
246 MODULE_AUTHOR("Milo Kim");
247