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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 | { | |
b7e53786 | 74 | .name = "tps65090-pmic", |
3c33be06 VB |
75 | }, |
76 | { | |
b7e53786 | 77 | .name = "tps65090-regulator", |
3c33be06 VB |
78 | }, |
79 | }; | |
80 | ||
3c33be06 VB |
81 | int tps65090_write(struct device *dev, int reg, uint8_t val) |
82 | { | |
83 | struct tps65090 *tps = dev_get_drvdata(dev); | |
84 | return regmap_write(tps->rmap, reg, val); | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(tps65090_write); | |
87 | ||
88 | int tps65090_read(struct device *dev, int reg, uint8_t *val) | |
89 | { | |
90 | struct tps65090 *tps = dev_get_drvdata(dev); | |
91 | unsigned int temp_val; | |
92 | int ret; | |
93 | ret = regmap_read(tps->rmap, reg, &temp_val); | |
94 | if (!ret) | |
95 | *val = temp_val; | |
96 | return ret; | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(tps65090_read); | |
99 | ||
100 | int tps65090_set_bits(struct device *dev, int reg, uint8_t bit_num) | |
101 | { | |
102 | struct tps65090 *tps = dev_get_drvdata(dev); | |
103 | return regmap_update_bits(tps->rmap, reg, BIT(bit_num), ~0u); | |
104 | } | |
105 | EXPORT_SYMBOL_GPL(tps65090_set_bits); | |
106 | ||
107 | int tps65090_clr_bits(struct device *dev, int reg, uint8_t bit_num) | |
108 | { | |
109 | struct tps65090 *tps = dev_get_drvdata(dev); | |
110 | return regmap_update_bits(tps->rmap, reg, BIT(bit_num), 0u); | |
111 | } | |
112 | EXPORT_SYMBOL_GPL(tps65090_clr_bits); | |
113 | ||
114 | static void tps65090_irq_lock(struct irq_data *data) | |
115 | { | |
116 | struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data); | |
117 | ||
118 | mutex_lock(&tps65090->irq_lock); | |
119 | } | |
120 | ||
121 | static void tps65090_irq_mask(struct irq_data *irq_data) | |
122 | { | |
123 | struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data); | |
124 | unsigned int __irq = irq_data->hwirq; | |
125 | const struct tps65090_irq_data *data = &tps65090_irqs[__irq]; | |
126 | ||
127 | tps65090_set_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg), | |
128 | data->mask_pos); | |
129 | } | |
130 | ||
131 | static void tps65090_irq_unmask(struct irq_data *irq_data) | |
132 | { | |
133 | struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data); | |
134 | unsigned int __irq = irq_data->irq - tps65090->irq_base; | |
135 | const struct tps65090_irq_data *data = &tps65090_irqs[__irq]; | |
136 | ||
137 | tps65090_clr_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg), | |
138 | data->mask_pos); | |
139 | } | |
140 | ||
141 | static void tps65090_irq_sync_unlock(struct irq_data *data) | |
142 | { | |
143 | struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data); | |
144 | ||
145 | mutex_unlock(&tps65090->irq_lock); | |
146 | } | |
147 | ||
148 | static irqreturn_t tps65090_irq(int irq, void *data) | |
149 | { | |
150 | struct tps65090 *tps65090 = data; | |
151 | int ret = 0; | |
152 | u8 status, mask; | |
153 | unsigned long int acks = 0; | |
154 | int i; | |
155 | ||
156 | for (i = 0; i < NUM_INT_REG; i++) { | |
157 | ret = tps65090_read(tps65090->dev, TPS65090_INT_MSK + i, &mask); | |
158 | if (ret < 0) { | |
159 | dev_err(tps65090->dev, | |
160 | "failed to read mask reg [addr:%d]\n", | |
161 | TPS65090_INT_MSK + i); | |
162 | return IRQ_NONE; | |
163 | } | |
164 | ret = tps65090_read(tps65090->dev, TPS65090_INT_STS + i, | |
165 | &status); | |
166 | if (ret < 0) { | |
167 | dev_err(tps65090->dev, | |
168 | "failed to read status reg [addr:%d]\n", | |
169 | TPS65090_INT_STS + i); | |
170 | return IRQ_NONE; | |
171 | } | |
172 | if (status) { | |
173 | /* Ack only those interrupts which are not masked */ | |
174 | status &= (~mask); | |
175 | ret = tps65090_write(tps65090->dev, | |
176 | TPS65090_INT_STS + i, status); | |
177 | if (ret < 0) { | |
178 | dev_err(tps65090->dev, | |
179 | "failed to write interrupt status\n"); | |
180 | return IRQ_NONE; | |
181 | } | |
182 | acks |= (status << (i * 8)); | |
183 | } | |
184 | } | |
185 | ||
186 | for_each_set_bit(i, &acks, ARRAY_SIZE(tps65090_irqs)) | |
187 | handle_nested_irq(tps65090->irq_base + i); | |
188 | return acks ? IRQ_HANDLED : IRQ_NONE; | |
189 | } | |
190 | ||
191 | static int __devinit tps65090_irq_init(struct tps65090 *tps65090, int irq, | |
192 | int irq_base) | |
193 | { | |
194 | int i, ret; | |
195 | ||
196 | if (!irq_base) { | |
197 | dev_err(tps65090->dev, "IRQ base not set\n"); | |
198 | return -EINVAL; | |
199 | } | |
200 | ||
201 | mutex_init(&tps65090->irq_lock); | |
202 | ||
203 | for (i = 0; i < NUM_INT_REG; i++) | |
204 | tps65090_write(tps65090->dev, TPS65090_INT_MSK + i, 0xFF); | |
205 | ||
206 | for (i = 0; i < NUM_INT_REG; i++) | |
207 | tps65090_write(tps65090->dev, TPS65090_INT_STS + i, 0xff); | |
208 | ||
209 | tps65090->irq_base = irq_base; | |
210 | tps65090->irq_chip.name = "tps65090"; | |
211 | tps65090->irq_chip.irq_mask = tps65090_irq_mask; | |
212 | tps65090->irq_chip.irq_unmask = tps65090_irq_unmask; | |
213 | tps65090->irq_chip.irq_bus_lock = tps65090_irq_lock; | |
214 | tps65090->irq_chip.irq_bus_sync_unlock = tps65090_irq_sync_unlock; | |
215 | ||
216 | for (i = 0; i < ARRAY_SIZE(tps65090_irqs); i++) { | |
217 | int __irq = i + tps65090->irq_base; | |
218 | irq_set_chip_data(__irq, tps65090); | |
219 | irq_set_chip_and_handler(__irq, &tps65090->irq_chip, | |
220 | handle_simple_irq); | |
221 | irq_set_nested_thread(__irq, 1); | |
222 | #ifdef CONFIG_ARM | |
223 | set_irq_flags(__irq, IRQF_VALID); | |
224 | #endif | |
225 | } | |
226 | ||
227 | ret = request_threaded_irq(irq, NULL, tps65090_irq, IRQF_ONESHOT, | |
228 | "tps65090", tps65090); | |
229 | if (!ret) { | |
230 | device_init_wakeup(tps65090->dev, 1); | |
231 | enable_irq_wake(irq); | |
232 | } | |
233 | ||
234 | return ret; | |
235 | } | |
236 | ||
237 | static bool is_volatile_reg(struct device *dev, unsigned int reg) | |
238 | { | |
239 | if ((reg == TPS65090_INT_STS) || (reg == TPS65090_INT_STS)) | |
240 | return true; | |
241 | else | |
242 | return false; | |
243 | } | |
244 | ||
245 | static const struct regmap_config tps65090_regmap_config = { | |
246 | .reg_bits = 8, | |
247 | .val_bits = 8, | |
248 | .max_register = TOTAL_NUM_REG, | |
249 | .num_reg_defaults_raw = TOTAL_NUM_REG, | |
250 | .cache_type = REGCACHE_RBTREE, | |
251 | .volatile_reg = is_volatile_reg, | |
252 | }; | |
253 | ||
254 | static int __devinit tps65090_i2c_probe(struct i2c_client *client, | |
255 | const struct i2c_device_id *id) | |
256 | { | |
257 | struct tps65090_platform_data *pdata = client->dev.platform_data; | |
258 | struct tps65090 *tps65090; | |
259 | int ret; | |
260 | ||
261 | if (!pdata) { | |
262 | dev_err(&client->dev, "tps65090 requires platform data\n"); | |
263 | return -EINVAL; | |
264 | } | |
265 | ||
266 | tps65090 = devm_kzalloc(&client->dev, sizeof(struct tps65090), | |
267 | GFP_KERNEL); | |
268 | if (tps65090 == NULL) | |
269 | return -ENOMEM; | |
270 | ||
271 | tps65090->client = client; | |
272 | tps65090->dev = &client->dev; | |
273 | i2c_set_clientdata(client, tps65090); | |
274 | ||
275 | mutex_init(&tps65090->lock); | |
276 | ||
277 | if (client->irq) { | |
278 | ret = tps65090_irq_init(tps65090, client->irq, pdata->irq_base); | |
279 | if (ret) { | |
280 | dev_err(&client->dev, "IRQ init failed with err: %d\n", | |
281 | ret); | |
282 | goto err_exit; | |
283 | } | |
284 | } | |
285 | ||
1d88f7a0 AL |
286 | tps65090->rmap = devm_regmap_init_i2c(tps65090->client, |
287 | &tps65090_regmap_config); | |
3c33be06 | 288 | if (IS_ERR(tps65090->rmap)) { |
b683a0a6 AL |
289 | ret = PTR_ERR(tps65090->rmap); |
290 | dev_err(&client->dev, "regmap_init failed with err: %d\n", ret); | |
3c33be06 | 291 | goto err_irq_exit; |
b683a0a6 | 292 | } |
3c33be06 VB |
293 | |
294 | ret = mfd_add_devices(tps65090->dev, -1, tps65090s, | |
0848c94f | 295 | ARRAY_SIZE(tps65090s), NULL, 0, NULL); |
3c33be06 VB |
296 | if (ret) { |
297 | dev_err(&client->dev, "add mfd devices failed with err: %d\n", | |
298 | ret); | |
1d88f7a0 | 299 | goto err_irq_exit; |
3c33be06 VB |
300 | } |
301 | ||
302 | return 0; | |
303 | ||
3c33be06 VB |
304 | err_irq_exit: |
305 | if (client->irq) | |
306 | free_irq(client->irq, tps65090); | |
307 | err_exit: | |
308 | return ret; | |
309 | } | |
310 | ||
311 | static int __devexit tps65090_i2c_remove(struct i2c_client *client) | |
312 | { | |
313 | struct tps65090 *tps65090 = i2c_get_clientdata(client); | |
314 | ||
315 | mfd_remove_devices(tps65090->dev); | |
3c33be06 VB |
316 | if (client->irq) |
317 | free_irq(client->irq, tps65090); | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
1ca5513a | 322 | #ifdef CONFIG_PM_SLEEP |
b6c9eeef | 323 | static int tps65090_suspend(struct device *dev) |
3c33be06 | 324 | { |
b6c9eeef | 325 | struct i2c_client *client = to_i2c_client(dev); |
3c33be06 VB |
326 | if (client->irq) |
327 | disable_irq(client->irq); | |
328 | return 0; | |
329 | } | |
330 | ||
b6c9eeef | 331 | static int tps65090_resume(struct device *dev) |
3c33be06 | 332 | { |
b6c9eeef | 333 | struct i2c_client *client = to_i2c_client(dev); |
3c33be06 VB |
334 | if (client->irq) |
335 | enable_irq(client->irq); | |
336 | return 0; | |
337 | } | |
338 | #endif | |
339 | ||
b6c9eeef MB |
340 | static const struct dev_pm_ops tps65090_pm_ops = { |
341 | SET_SYSTEM_SLEEP_PM_OPS(tps65090_suspend, tps65090_resume) | |
342 | }; | |
343 | ||
3c33be06 VB |
344 | static const struct i2c_device_id tps65090_id_table[] = { |
345 | { "tps65090", 0 }, | |
346 | { }, | |
347 | }; | |
348 | MODULE_DEVICE_TABLE(i2c, tps65090_id_table); | |
349 | ||
350 | static struct i2c_driver tps65090_driver = { | |
351 | .driver = { | |
352 | .name = "tps65090", | |
353 | .owner = THIS_MODULE, | |
b6c9eeef | 354 | .pm = &tps65090_pm_ops, |
3c33be06 VB |
355 | }, |
356 | .probe = tps65090_i2c_probe, | |
357 | .remove = __devexit_p(tps65090_i2c_remove), | |
3c33be06 VB |
358 | .id_table = tps65090_id_table, |
359 | }; | |
360 | ||
361 | static int __init tps65090_init(void) | |
362 | { | |
363 | return i2c_add_driver(&tps65090_driver); | |
364 | } | |
365 | subsys_initcall(tps65090_init); | |
366 | ||
367 | static void __exit tps65090_exit(void) | |
368 | { | |
369 | i2c_del_driver(&tps65090_driver); | |
370 | } | |
371 | module_exit(tps65090_exit); | |
372 | ||
373 | MODULE_DESCRIPTION("TPS65090 core driver"); | |
374 | MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>"); | |
375 | MODULE_LICENSE("GPL v2"); |