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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 struct regmap_config tps65218_regmap_config = { | |
129 | .reg_bits = 8, | |
130 | .val_bits = 8, | |
131 | .cache_type = REGCACHE_RBTREE, | |
132 | }; | |
133 | ||
134 | static const struct regmap_irq tps65218_irqs[] = { | |
135 | /* INT1 IRQs */ | |
136 | [TPS65218_PRGC_IRQ] = { | |
137 | .mask = TPS65218_INT1_PRGC, | |
138 | }, | |
139 | [TPS65218_CC_AQC_IRQ] = { | |
140 | .mask = TPS65218_INT1_CC_AQC, | |
141 | }, | |
142 | [TPS65218_HOT_IRQ] = { | |
143 | .mask = TPS65218_INT1_HOT, | |
144 | }, | |
145 | [TPS65218_PB_IRQ] = { | |
146 | .mask = TPS65218_INT1_PB, | |
147 | }, | |
148 | [TPS65218_AC_IRQ] = { | |
149 | .mask = TPS65218_INT1_AC, | |
150 | }, | |
151 | [TPS65218_VPRG_IRQ] = { | |
152 | .mask = TPS65218_INT1_VPRG, | |
153 | }, | |
154 | [TPS65218_INVALID1_IRQ] = { | |
155 | }, | |
156 | [TPS65218_INVALID2_IRQ] = { | |
157 | }, | |
158 | /* INT2 IRQs*/ | |
159 | [TPS65218_LS1_I_IRQ] = { | |
160 | .mask = TPS65218_INT2_LS1_I, | |
161 | .reg_offset = 1, | |
162 | }, | |
163 | [TPS65218_LS2_I_IRQ] = { | |
164 | .mask = TPS65218_INT2_LS2_I, | |
165 | .reg_offset = 1, | |
166 | }, | |
167 | [TPS65218_LS3_I_IRQ] = { | |
168 | .mask = TPS65218_INT2_LS3_I, | |
169 | .reg_offset = 1, | |
170 | }, | |
171 | [TPS65218_LS1_F_IRQ] = { | |
172 | .mask = TPS65218_INT2_LS1_F, | |
173 | .reg_offset = 1, | |
174 | }, | |
175 | [TPS65218_LS2_F_IRQ] = { | |
176 | .mask = TPS65218_INT2_LS2_F, | |
177 | .reg_offset = 1, | |
178 | }, | |
179 | [TPS65218_LS3_F_IRQ] = { | |
180 | .mask = TPS65218_INT2_LS3_F, | |
181 | .reg_offset = 1, | |
182 | }, | |
183 | [TPS65218_INVALID3_IRQ] = { | |
184 | }, | |
185 | [TPS65218_INVALID4_IRQ] = { | |
186 | }, | |
187 | }; | |
188 | ||
189 | static struct regmap_irq_chip tps65218_irq_chip = { | |
190 | .name = "tps65218", | |
191 | .irqs = tps65218_irqs, | |
192 | .num_irqs = ARRAY_SIZE(tps65218_irqs), | |
193 | ||
194 | .num_regs = 2, | |
195 | .mask_base = TPS65218_REG_INT_MASK1, | |
196 | }; | |
197 | ||
198 | static const struct of_device_id of_tps65218_match_table[] = { | |
199 | { .compatible = "ti,tps65218", }, | |
200 | }; | |
201 | ||
202 | static int tps65218_probe(struct i2c_client *client, | |
203 | const struct i2c_device_id *ids) | |
204 | { | |
205 | struct tps65218 *tps; | |
206 | const struct of_device_id *match; | |
207 | int ret; | |
208 | ||
209 | match = of_match_device(of_tps65218_match_table, &client->dev); | |
210 | if (!match) { | |
211 | dev_err(&client->dev, | |
212 | "Failed to find matching dt id\n"); | |
213 | return -EINVAL; | |
214 | } | |
215 | ||
216 | tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); | |
217 | if (!tps) | |
218 | return -ENOMEM; | |
219 | ||
220 | i2c_set_clientdata(client, tps); | |
221 | tps->dev = &client->dev; | |
222 | tps->irq = client->irq; | |
223 | tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config); | |
224 | if (IS_ERR(tps->regmap)) { | |
225 | ret = PTR_ERR(tps->regmap); | |
226 | dev_err(tps->dev, "Failed to allocate register map: %d\n", | |
227 | ret); | |
228 | return ret; | |
229 | } | |
230 | ||
231 | mutex_init(&tps->tps_lock); | |
232 | ||
233 | ret = regmap_add_irq_chip(tps->regmap, tps->irq, | |
234 | IRQF_ONESHOT, 0, &tps65218_irq_chip, | |
235 | &tps->irq_data); | |
236 | if (ret < 0) | |
237 | return ret; | |
238 | ||
239 | ret = of_platform_populate(client->dev.of_node, NULL, NULL, | |
240 | &client->dev); | |
241 | if (ret < 0) | |
242 | goto err_irq; | |
243 | ||
244 | return 0; | |
245 | ||
246 | err_irq: | |
247 | regmap_del_irq_chip(tps->irq, tps->irq_data); | |
248 | ||
249 | return ret; | |
250 | } | |
251 | ||
252 | static int tps65218_remove(struct i2c_client *client) | |
253 | { | |
254 | struct tps65218 *tps = i2c_get_clientdata(client); | |
255 | ||
256 | regmap_del_irq_chip(tps->irq, tps->irq_data); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static const struct i2c_device_id tps65218_id_table[] = { | |
262 | { "tps65218", TPS65218 }, | |
263 | { }, | |
264 | }; | |
265 | MODULE_DEVICE_TABLE(i2c, tps65218_id_table); | |
266 | ||
267 | static struct i2c_driver tps65218_driver = { | |
268 | .driver = { | |
269 | .name = "tps65218", | |
270 | .owner = THIS_MODULE, | |
271 | .of_match_table = of_tps65218_match_table, | |
272 | }, | |
273 | .probe = tps65218_probe, | |
274 | .remove = tps65218_remove, | |
275 | .id_table = tps65218_id_table, | |
276 | }; | |
277 | ||
278 | module_i2c_driver(tps65218_driver); | |
279 | ||
280 | MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); | |
281 | MODULE_DESCRIPTION("TPS65218 chip family multi-function driver"); | |
282 | MODULE_LICENSE("GPL v2"); |