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
tps65090_write(struct device * dev,int reg,uint8_t val)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
tps65090_read(struct device * dev,int reg,uint8_t * val)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
tps65090_set_bits(struct device * dev,int reg,uint8_t bit_num)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
tps65090_clr_bits(struct device * dev,int reg,uint8_t bit_num)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
tps65090_irq_lock(struct irq_data * data)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
tps65090_irq_mask(struct irq_data * irq_data)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
tps65090_irq_unmask(struct irq_data * irq_data)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
tps65090_irq_sync_unlock(struct irq_data * data)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
tps65090_irq(int irq,void * data)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
tps65090_irq_init(struct tps65090 * tps65090,int irq,int irq_base)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
is_volatile_reg(struct device * dev,unsigned int reg)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
tps65090_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)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
tps65090_i2c_remove(struct i2c_client * client)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
tps65090_i2c_suspend(struct i2c_client * client,pm_message_t state)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
tps65090_i2c_resume(struct i2c_client * client)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
tps65090_init(void)373 static int __init tps65090_init(void)
374 {
375 return i2c_add_driver(&tps65090_driver);
376 }
377 subsys_initcall(tps65090_init);
378
tps65090_exit(void)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");
388