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