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3c33be06 VB |
1 | /* |
2 | * Core driver for TI TPS65090 PMIC family | |
3 | * | |
4 | * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. | |
5 | ||
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | ||
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | ||
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <linux/interrupt.h> | |
20 | #include <linux/irq.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/mutex.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/i2c.h> | |
26 | #include <linux/mfd/core.h> | |
27 | #include <linux/mfd/tps65090.h> | |
28 | #include <linux/regmap.h> | |
29 | #include <linux/err.h> | |
30 | ||
31 | #define NUM_INT_REG 2 | |
32 | #define TOTAL_NUM_REG 0x18 | |
33 | ||
34 | /* interrupt status registers */ | |
35 | #define TPS65090_INT_STS 0x0 | |
36 | #define TPS65090_INT_STS2 0x1 | |
37 | ||
38 | /* interrupt mask registers */ | |
39 | #define TPS65090_INT_MSK 0x2 | |
40 | #define TPS65090_INT_MSK2 0x3 | |
41 | ||
42 | struct tps65090_irq_data { | |
43 | u8 mask_reg; | |
44 | u8 mask_pos; | |
45 | }; | |
46 | ||
47 | #define TPS65090_IRQ(_reg, _mask_pos) \ | |
48 | { \ | |
49 | .mask_reg = (_reg), \ | |
50 | .mask_pos = (_mask_pos), \ | |
51 | } | |
52 | ||
53 | static const struct tps65090_irq_data tps65090_irqs[] = { | |
54 | [0] = TPS65090_IRQ(0, 0), | |
55 | [1] = TPS65090_IRQ(0, 1), | |
56 | [2] = TPS65090_IRQ(0, 2), | |
57 | [3] = TPS65090_IRQ(0, 3), | |
58 | [4] = TPS65090_IRQ(0, 4), | |
59 | [5] = TPS65090_IRQ(0, 5), | |
60 | [6] = TPS65090_IRQ(0, 6), | |
61 | [7] = TPS65090_IRQ(0, 7), | |
62 | [8] = TPS65090_IRQ(1, 0), | |
63 | [9] = TPS65090_IRQ(1, 1), | |
64 | [10] = TPS65090_IRQ(1, 2), | |
65 | [11] = TPS65090_IRQ(1, 3), | |
66 | [12] = TPS65090_IRQ(1, 4), | |
67 | [13] = TPS65090_IRQ(1, 5), | |
68 | [14] = TPS65090_IRQ(1, 6), | |
69 | [15] = TPS65090_IRQ(1, 7), | |
70 | }; | |
71 | ||
72 | static struct mfd_cell tps65090s[] = { | |
73 | { | |
74 | .name = "tps65910-pmic", | |
75 | }, | |
76 | { | |
77 | .name = "tps65910-regulator", | |
78 | }, | |
79 | }; | |
80 | ||
81 | struct tps65090 { | |
82 | struct mutex lock; | |
83 | struct device *dev; | |
84 | struct i2c_client *client; | |
85 | struct regmap *rmap; | |
86 | struct irq_chip irq_chip; | |
87 | struct mutex irq_lock; | |
88 | int irq_base; | |
89 | unsigned int id; | |
90 | }; | |
91 | ||
92 | int tps65090_write(struct device *dev, int reg, uint8_t val) | |
93 | { | |
94 | struct tps65090 *tps = dev_get_drvdata(dev); | |
95 | return regmap_write(tps->rmap, reg, val); | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(tps65090_write); | |
98 | ||
99 | int tps65090_read(struct device *dev, int reg, uint8_t *val) | |
100 | { | |
101 | struct tps65090 *tps = dev_get_drvdata(dev); | |
102 | unsigned int temp_val; | |
103 | int ret; | |
104 | ret = regmap_read(tps->rmap, reg, &temp_val); | |
105 | if (!ret) | |
106 | *val = temp_val; | |
107 | return ret; | |
108 | } | |
109 | EXPORT_SYMBOL_GPL(tps65090_read); | |
110 | ||
111 | int tps65090_set_bits(struct device *dev, int reg, uint8_t bit_num) | |
112 | { | |
113 | struct tps65090 *tps = dev_get_drvdata(dev); | |
114 | return regmap_update_bits(tps->rmap, reg, BIT(bit_num), ~0u); | |
115 | } | |
116 | EXPORT_SYMBOL_GPL(tps65090_set_bits); | |
117 | ||
118 | int tps65090_clr_bits(struct device *dev, int reg, uint8_t bit_num) | |
119 | { | |
120 | struct tps65090 *tps = dev_get_drvdata(dev); | |
121 | return regmap_update_bits(tps->rmap, reg, BIT(bit_num), 0u); | |
122 | } | |
123 | EXPORT_SYMBOL_GPL(tps65090_clr_bits); | |
124 | ||
125 | static void tps65090_irq_lock(struct irq_data *data) | |
126 | { | |
127 | struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data); | |
128 | ||
129 | mutex_lock(&tps65090->irq_lock); | |
130 | } | |
131 | ||
132 | static void tps65090_irq_mask(struct irq_data *irq_data) | |
133 | { | |
134 | struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data); | |
135 | unsigned int __irq = irq_data->hwirq; | |
136 | const struct tps65090_irq_data *data = &tps65090_irqs[__irq]; | |
137 | ||
138 | tps65090_set_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg), | |
139 | data->mask_pos); | |
140 | } | |
141 | ||
142 | static void tps65090_irq_unmask(struct irq_data *irq_data) | |
143 | { | |
144 | struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data); | |
145 | unsigned int __irq = irq_data->irq - tps65090->irq_base; | |
146 | const struct tps65090_irq_data *data = &tps65090_irqs[__irq]; | |
147 | ||
148 | tps65090_clr_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg), | |
149 | data->mask_pos); | |
150 | } | |
151 | ||
152 | static void tps65090_irq_sync_unlock(struct irq_data *data) | |
153 | { | |
154 | struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data); | |
155 | ||
156 | mutex_unlock(&tps65090->irq_lock); | |
157 | } | |
158 | ||
159 | static irqreturn_t tps65090_irq(int irq, void *data) | |
160 | { | |
161 | struct tps65090 *tps65090 = data; | |
162 | int ret = 0; | |
163 | u8 status, mask; | |
164 | unsigned long int acks = 0; | |
165 | int i; | |
166 | ||
167 | for (i = 0; i < NUM_INT_REG; i++) { | |
168 | ret = tps65090_read(tps65090->dev, TPS65090_INT_MSK + i, &mask); | |
169 | if (ret < 0) { | |
170 | dev_err(tps65090->dev, | |
171 | "failed to read mask reg [addr:%d]\n", | |
172 | TPS65090_INT_MSK + i); | |
173 | return IRQ_NONE; | |
174 | } | |
175 | ret = tps65090_read(tps65090->dev, TPS65090_INT_STS + i, | |
176 | &status); | |
177 | if (ret < 0) { | |
178 | dev_err(tps65090->dev, | |
179 | "failed to read status reg [addr:%d]\n", | |
180 | TPS65090_INT_STS + i); | |
181 | return IRQ_NONE; | |
182 | } | |
183 | if (status) { | |
184 | /* Ack only those interrupts which are not masked */ | |
185 | status &= (~mask); | |
186 | ret = tps65090_write(tps65090->dev, | |
187 | TPS65090_INT_STS + i, status); | |
188 | if (ret < 0) { | |
189 | dev_err(tps65090->dev, | |
190 | "failed to write interrupt status\n"); | |
191 | return IRQ_NONE; | |
192 | } | |
193 | acks |= (status << (i * 8)); | |
194 | } | |
195 | } | |
196 | ||
197 | for_each_set_bit(i, &acks, ARRAY_SIZE(tps65090_irqs)) | |
198 | handle_nested_irq(tps65090->irq_base + i); | |
199 | return acks ? IRQ_HANDLED : IRQ_NONE; | |
200 | } | |
201 | ||
202 | static int __devinit tps65090_irq_init(struct tps65090 *tps65090, int irq, | |
203 | int irq_base) | |
204 | { | |
205 | int i, ret; | |
206 | ||
207 | if (!irq_base) { | |
208 | dev_err(tps65090->dev, "IRQ base not set\n"); | |
209 | return -EINVAL; | |
210 | } | |
211 | ||
212 | mutex_init(&tps65090->irq_lock); | |
213 | ||
214 | for (i = 0; i < NUM_INT_REG; i++) | |
215 | tps65090_write(tps65090->dev, TPS65090_INT_MSK + i, 0xFF); | |
216 | ||
217 | for (i = 0; i < NUM_INT_REG; i++) | |
218 | tps65090_write(tps65090->dev, TPS65090_INT_STS + i, 0xff); | |
219 | ||
220 | tps65090->irq_base = irq_base; | |
221 | tps65090->irq_chip.name = "tps65090"; | |
222 | tps65090->irq_chip.irq_mask = tps65090_irq_mask; | |
223 | tps65090->irq_chip.irq_unmask = tps65090_irq_unmask; | |
224 | tps65090->irq_chip.irq_bus_lock = tps65090_irq_lock; | |
225 | tps65090->irq_chip.irq_bus_sync_unlock = tps65090_irq_sync_unlock; | |
226 | ||
227 | for (i = 0; i < ARRAY_SIZE(tps65090_irqs); i++) { | |
228 | int __irq = i + tps65090->irq_base; | |
229 | irq_set_chip_data(__irq, tps65090); | |
230 | irq_set_chip_and_handler(__irq, &tps65090->irq_chip, | |
231 | handle_simple_irq); | |
232 | irq_set_nested_thread(__irq, 1); | |
233 | #ifdef CONFIG_ARM | |
234 | set_irq_flags(__irq, IRQF_VALID); | |
235 | #endif | |
236 | } | |
237 | ||
238 | ret = request_threaded_irq(irq, NULL, tps65090_irq, IRQF_ONESHOT, | |
239 | "tps65090", tps65090); | |
240 | if (!ret) { | |
241 | device_init_wakeup(tps65090->dev, 1); | |
242 | enable_irq_wake(irq); | |
243 | } | |
244 | ||
245 | return ret; | |
246 | } | |
247 | ||
248 | static bool is_volatile_reg(struct device *dev, unsigned int reg) | |
249 | { | |
250 | if ((reg == TPS65090_INT_STS) || (reg == TPS65090_INT_STS)) | |
251 | return true; | |
252 | else | |
253 | return false; | |
254 | } | |
255 | ||
256 | static const struct regmap_config tps65090_regmap_config = { | |
257 | .reg_bits = 8, | |
258 | .val_bits = 8, | |
259 | .max_register = TOTAL_NUM_REG, | |
260 | .num_reg_defaults_raw = TOTAL_NUM_REG, | |
261 | .cache_type = REGCACHE_RBTREE, | |
262 | .volatile_reg = is_volatile_reg, | |
263 | }; | |
264 | ||
265 | static int __devinit tps65090_i2c_probe(struct i2c_client *client, | |
266 | const struct i2c_device_id *id) | |
267 | { | |
268 | struct tps65090_platform_data *pdata = client->dev.platform_data; | |
269 | struct tps65090 *tps65090; | |
270 | int ret; | |
271 | ||
272 | if (!pdata) { | |
273 | dev_err(&client->dev, "tps65090 requires platform data\n"); | |
274 | return -EINVAL; | |
275 | } | |
276 | ||
277 | tps65090 = devm_kzalloc(&client->dev, sizeof(struct tps65090), | |
278 | GFP_KERNEL); | |
279 | if (tps65090 == NULL) | |
280 | return -ENOMEM; | |
281 | ||
282 | tps65090->client = client; | |
283 | tps65090->dev = &client->dev; | |
284 | i2c_set_clientdata(client, tps65090); | |
285 | ||
286 | mutex_init(&tps65090->lock); | |
287 | ||
288 | if (client->irq) { | |
289 | ret = tps65090_irq_init(tps65090, client->irq, pdata->irq_base); | |
290 | if (ret) { | |
291 | dev_err(&client->dev, "IRQ init failed with err: %d\n", | |
292 | ret); | |
293 | goto err_exit; | |
294 | } | |
295 | } | |
296 | ||
297 | tps65090->rmap = regmap_init_i2c(tps65090->client, | |
298 | &tps65090_regmap_config); | |
299 | if (IS_ERR(tps65090->rmap)) { | |
300 | dev_err(&client->dev, "regmap_init failed with err: %ld\n", | |
301 | PTR_ERR(tps65090->rmap)); | |
302 | goto err_irq_exit; | |
303 | }; | |
304 | ||
305 | ret = mfd_add_devices(tps65090->dev, -1, tps65090s, | |
306 | ARRAY_SIZE(tps65090s), NULL, 0); | |
307 | if (ret) { | |
308 | dev_err(&client->dev, "add mfd devices failed with err: %d\n", | |
309 | ret); | |
310 | goto err_regmap_exit; | |
311 | } | |
312 | ||
313 | return 0; | |
314 | ||
315 | err_regmap_exit: | |
316 | regmap_exit(tps65090->rmap); | |
317 | ||
318 | err_irq_exit: | |
319 | if (client->irq) | |
320 | free_irq(client->irq, tps65090); | |
321 | err_exit: | |
322 | return ret; | |
323 | } | |
324 | ||
325 | static int __devexit tps65090_i2c_remove(struct i2c_client *client) | |
326 | { | |
327 | struct tps65090 *tps65090 = i2c_get_clientdata(client); | |
328 | ||
329 | mfd_remove_devices(tps65090->dev); | |
330 | regmap_exit(tps65090->rmap); | |
331 | if (client->irq) | |
332 | free_irq(client->irq, tps65090); | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | #ifdef CONFIG_PM | |
338 | static int tps65090_i2c_suspend(struct i2c_client *client, pm_message_t state) | |
339 | { | |
340 | if (client->irq) | |
341 | disable_irq(client->irq); | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static int tps65090_i2c_resume(struct i2c_client *client) | |
346 | { | |
347 | if (client->irq) | |
348 | enable_irq(client->irq); | |
349 | return 0; | |
350 | } | |
351 | #endif | |
352 | ||
353 | static const struct i2c_device_id tps65090_id_table[] = { | |
354 | { "tps65090", 0 }, | |
355 | { }, | |
356 | }; | |
357 | MODULE_DEVICE_TABLE(i2c, tps65090_id_table); | |
358 | ||
359 | static struct i2c_driver tps65090_driver = { | |
360 | .driver = { | |
361 | .name = "tps65090", | |
362 | .owner = THIS_MODULE, | |
363 | }, | |
364 | .probe = tps65090_i2c_probe, | |
365 | .remove = __devexit_p(tps65090_i2c_remove), | |
366 | #ifdef CONFIG_PM | |
367 | .suspend = tps65090_i2c_suspend, | |
368 | .resume = tps65090_i2c_resume, | |
369 | #endif | |
370 | .id_table = tps65090_id_table, | |
371 | }; | |
372 | ||
373 | static int __init tps65090_init(void) | |
374 | { | |
375 | return i2c_add_driver(&tps65090_driver); | |
376 | } | |
377 | subsys_initcall(tps65090_init); | |
378 | ||
379 | static void __exit tps65090_exit(void) | |
380 | { | |
381 | i2c_del_driver(&tps65090_driver); | |
382 | } | |
383 | module_exit(tps65090_exit); | |
384 | ||
385 | MODULE_DESCRIPTION("TPS65090 core driver"); | |
386 | MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>"); | |
387 | MODULE_LICENSE("GPL v2"); |