Merge branch 'strscpy' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf...
[firefly-linux-kernel-4.4.55.git] / drivers / mfd / tps65218.c
1 /*
2  * Driver for TPS65218 Integrated power management chipsets
3  *
4  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11  * kind, whether expressed or implied; without even the implied warranty
12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License version 2 for more details.
14  */
15
16 #include <linux/kernel.h>
17 #include <linux/device.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/init.h>
21 #include <linux/i2c.h>
22 #include <linux/slab.h>
23 #include <linux/regmap.h>
24 #include <linux/err.h>
25 #include <linux/of.h>
26 #include <linux/of_device.h>
27 #include <linux/irq.h>
28 #include <linux/interrupt.h>
29 #include <linux/mutex.h>
30
31 #include <linux/mfd/core.h>
32 #include <linux/mfd/tps65218.h>
33
34 #define TPS65218_PASSWORD_REGS_UNLOCK   0x7D
35
36 /**
37  * tps65218_reg_read: Read a single tps65218 register.
38  *
39  * @tps: Device to read from.
40  * @reg: Register to read.
41  * @val: Contians the value
42  */
43 int tps65218_reg_read(struct tps65218 *tps, unsigned int reg,
44                         unsigned int *val)
45 {
46         return regmap_read(tps->regmap, reg, val);
47 }
48 EXPORT_SYMBOL_GPL(tps65218_reg_read);
49
50 /**
51  * tps65218_reg_write: Write a single tps65218 register.
52  *
53  * @tps65218: Device to write to.
54  * @reg: Register to write to.
55  * @val: Value to write.
56  * @level: Password protected level
57  */
58 int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
59                         unsigned int val, unsigned int level)
60 {
61         int ret;
62         unsigned int xor_reg_val;
63
64         switch (level) {
65         case TPS65218_PROTECT_NONE:
66                 return regmap_write(tps->regmap, reg, val);
67         case TPS65218_PROTECT_L1:
68                 xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
69                 ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
70                                                         xor_reg_val);
71                 if (ret < 0)
72                         return ret;
73
74                 return regmap_write(tps->regmap, reg, val);
75         default:
76                 return -EINVAL;
77         }
78 }
79 EXPORT_SYMBOL_GPL(tps65218_reg_write);
80
81 /**
82  * tps65218_update_bits: Modify bits w.r.t mask, val and level.
83  *
84  * @tps65218: Device to write to.
85  * @reg: Register to read-write to.
86  * @mask: Mask.
87  * @val: Value to write.
88  * @level: Password protected level
89  */
90 static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
91                 unsigned int mask, unsigned int val, unsigned int level)
92 {
93         int ret;
94         unsigned int data;
95
96         ret = tps65218_reg_read(tps, reg, &data);
97         if (ret) {
98                 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
99                 return ret;
100         }
101
102         data &= ~mask;
103         data |= val & mask;
104
105         mutex_lock(&tps->tps_lock);
106         ret = tps65218_reg_write(tps, reg, data, level);
107         if (ret)
108                 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
109         mutex_unlock(&tps->tps_lock);
110
111         return ret;
112 }
113
114 int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
115                 unsigned int mask, unsigned int val, unsigned int level)
116 {
117         return tps65218_update_bits(tps, reg, mask, val, level);
118 }
119 EXPORT_SYMBOL_GPL(tps65218_set_bits);
120
121 int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
122                 unsigned int mask, unsigned int level)
123 {
124         return tps65218_update_bits(tps, reg, mask, 0, level);
125 }
126 EXPORT_SYMBOL_GPL(tps65218_clear_bits);
127
128 static const struct regmap_range tps65218_yes_ranges[] = {
129         regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2),
130         regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS),
131 };
132
133 static const struct regmap_access_table tps65218_volatile_table = {
134         .yes_ranges = tps65218_yes_ranges,
135         .n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges),
136 };
137
138 static const struct regmap_config tps65218_regmap_config = {
139         .reg_bits = 8,
140         .val_bits = 8,
141         .cache_type = REGCACHE_RBTREE,
142         .volatile_table = &tps65218_volatile_table,
143 };
144
145 static const struct regmap_irq tps65218_irqs[] = {
146         /* INT1 IRQs */
147         [TPS65218_PRGC_IRQ] = {
148                 .mask = TPS65218_INT1_PRGC,
149         },
150         [TPS65218_CC_AQC_IRQ] = {
151                 .mask = TPS65218_INT1_CC_AQC,
152         },
153         [TPS65218_HOT_IRQ] = {
154                 .mask = TPS65218_INT1_HOT,
155         },
156         [TPS65218_PB_IRQ] = {
157                 .mask = TPS65218_INT1_PB,
158         },
159         [TPS65218_AC_IRQ] = {
160                 .mask = TPS65218_INT1_AC,
161         },
162         [TPS65218_VPRG_IRQ] = {
163                 .mask = TPS65218_INT1_VPRG,
164         },
165         [TPS65218_INVALID1_IRQ] = {
166         },
167         [TPS65218_INVALID2_IRQ] = {
168         },
169         /* INT2 IRQs*/
170         [TPS65218_LS1_I_IRQ] = {
171                 .mask = TPS65218_INT2_LS1_I,
172                 .reg_offset = 1,
173         },
174         [TPS65218_LS2_I_IRQ] = {
175                 .mask = TPS65218_INT2_LS2_I,
176                 .reg_offset = 1,
177         },
178         [TPS65218_LS3_I_IRQ] = {
179                 .mask = TPS65218_INT2_LS3_I,
180                 .reg_offset = 1,
181         },
182         [TPS65218_LS1_F_IRQ] = {
183                 .mask = TPS65218_INT2_LS1_F,
184                 .reg_offset = 1,
185         },
186         [TPS65218_LS2_F_IRQ] = {
187                 .mask = TPS65218_INT2_LS2_F,
188                 .reg_offset = 1,
189         },
190         [TPS65218_LS3_F_IRQ] = {
191                 .mask = TPS65218_INT2_LS3_F,
192                 .reg_offset = 1,
193         },
194         [TPS65218_INVALID3_IRQ] = {
195         },
196         [TPS65218_INVALID4_IRQ] = {
197         },
198 };
199
200 static struct regmap_irq_chip tps65218_irq_chip = {
201         .name = "tps65218",
202         .irqs = tps65218_irqs,
203         .num_irqs = ARRAY_SIZE(tps65218_irqs),
204
205         .num_regs = 2,
206         .mask_base = TPS65218_REG_INT_MASK1,
207         .status_base = TPS65218_REG_INT1,
208 };
209
210 static const struct of_device_id of_tps65218_match_table[] = {
211         { .compatible = "ti,tps65218", },
212         {}
213 };
214 MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
215
216 static int tps65218_probe(struct i2c_client *client,
217                                 const struct i2c_device_id *ids)
218 {
219         struct tps65218 *tps;
220         const struct of_device_id *match;
221         int ret;
222
223         match = of_match_device(of_tps65218_match_table, &client->dev);
224         if (!match) {
225                 dev_err(&client->dev,
226                         "Failed to find matching dt id\n");
227                 return -EINVAL;
228         }
229
230         tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
231         if (!tps)
232                 return -ENOMEM;
233
234         i2c_set_clientdata(client, tps);
235         tps->dev = &client->dev;
236         tps->irq = client->irq;
237         tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
238         if (IS_ERR(tps->regmap)) {
239                 ret = PTR_ERR(tps->regmap);
240                 dev_err(tps->dev, "Failed to allocate register map: %d\n",
241                         ret);
242                 return ret;
243         }
244
245         mutex_init(&tps->tps_lock);
246
247         ret = regmap_add_irq_chip(tps->regmap, tps->irq,
248                         IRQF_ONESHOT, 0, &tps65218_irq_chip,
249                         &tps->irq_data);
250         if (ret < 0)
251                 return ret;
252
253         ret = of_platform_populate(client->dev.of_node, NULL, NULL,
254                                    &client->dev);
255         if (ret < 0)
256                 goto err_irq;
257
258         return 0;
259
260 err_irq:
261         regmap_del_irq_chip(tps->irq, tps->irq_data);
262
263         return ret;
264 }
265
266 static int tps65218_remove(struct i2c_client *client)
267 {
268         struct tps65218 *tps = i2c_get_clientdata(client);
269
270         regmap_del_irq_chip(tps->irq, tps->irq_data);
271
272         return 0;
273 }
274
275 static const struct i2c_device_id tps65218_id_table[] = {
276         { "tps65218", TPS65218 },
277         { },
278 };
279 MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
280
281 static struct i2c_driver tps65218_driver = {
282         .driver         = {
283                 .name   = "tps65218",
284                 .of_match_table = of_tps65218_match_table,
285         },
286         .probe          = tps65218_probe,
287         .remove         = tps65218_remove,
288         .id_table       = tps65218_id_table,
289 };
290
291 module_i2c_driver(tps65218_driver);
292
293 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
294 MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
295 MODULE_LICENSE("GPL v2");