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8
9#include <linux/module.h>
10#include <linux/interrupt.h>
11#include <linux/irq.h>
12#include <linux/irqdomain.h>
13#include <linux/slab.h>
14#include <linux/i2c.h>
15#include <linux/of.h>
16#include <linux/of_device.h>
17#include <linux/mfd/core.h>
18#include <linux/mfd/tc3589x.h>
19#include <linux/err.h>
20
21
22
23
24enum tc3589x_version {
25 TC3589X_TC35890,
26 TC3589X_TC35892,
27 TC3589X_TC35893,
28 TC3589X_TC35894,
29 TC3589X_TC35895,
30 TC3589X_TC35896,
31 TC3589X_UNKNOWN,
32};
33
34#define TC3589x_CLKMODE_MODCTL_SLEEP 0x0
35#define TC3589x_CLKMODE_MODCTL_OPERATION (1 << 0)
36
37
38
39
40
41
42int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
43{
44 int ret;
45
46 ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
47 if (ret < 0)
48 dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
49 reg, ret);
50
51 return ret;
52}
53EXPORT_SYMBOL_GPL(tc3589x_reg_read);
54
55
56
57
58
59
60
61int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
62{
63 int ret;
64
65 ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
66 if (ret < 0)
67 dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
68 reg, ret);
69
70 return ret;
71}
72EXPORT_SYMBOL_GPL(tc3589x_reg_write);
73
74
75
76
77
78
79
80
81int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values)
82{
83 int ret;
84
85 ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
86 if (ret < 0)
87 dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
88 reg, ret);
89
90 return ret;
91}
92EXPORT_SYMBOL_GPL(tc3589x_block_read);
93
94
95
96
97
98
99
100
101int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
102 const u8 *values)
103{
104 int ret;
105
106 ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
107 values);
108 if (ret < 0)
109 dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
110 reg, ret);
111
112 return ret;
113}
114EXPORT_SYMBOL_GPL(tc3589x_block_write);
115
116
117
118
119
120
121
122
123int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
124{
125 int ret;
126
127 mutex_lock(&tc3589x->lock);
128
129 ret = tc3589x_reg_read(tc3589x, reg);
130 if (ret < 0)
131 goto out;
132
133 ret &= ~mask;
134 ret |= val;
135
136 ret = tc3589x_reg_write(tc3589x, reg, ret);
137
138out:
139 mutex_unlock(&tc3589x->lock);
140 return ret;
141}
142EXPORT_SYMBOL_GPL(tc3589x_set_bits);
143
144static struct resource gpio_resources[] = {
145 {
146 .start = TC3589x_INT_GPIIRQ,
147 .end = TC3589x_INT_GPIIRQ,
148 .flags = IORESOURCE_IRQ,
149 },
150};
151
152static struct resource keypad_resources[] = {
153 {
154 .start = TC3589x_INT_KBDIRQ,
155 .end = TC3589x_INT_KBDIRQ,
156 .flags = IORESOURCE_IRQ,
157 },
158};
159
160static const struct mfd_cell tc3589x_dev_gpio[] = {
161 {
162 .name = "tc3589x-gpio",
163 .num_resources = ARRAY_SIZE(gpio_resources),
164 .resources = &gpio_resources[0],
165 .of_compatible = "toshiba,tc3589x-gpio",
166 },
167};
168
169static const struct mfd_cell tc3589x_dev_keypad[] = {
170 {
171 .name = "tc3589x-keypad",
172 .num_resources = ARRAY_SIZE(keypad_resources),
173 .resources = &keypad_resources[0],
174 .of_compatible = "toshiba,tc3589x-keypad",
175 },
176};
177
178static irqreturn_t tc3589x_irq(int irq, void *data)
179{
180 struct tc3589x *tc3589x = data;
181 int status;
182
183again:
184 status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
185 if (status < 0)
186 return IRQ_NONE;
187
188 while (status) {
189 int bit = __ffs(status);
190 int virq = irq_create_mapping(tc3589x->domain, bit);
191
192 handle_nested_irq(virq);
193 status &= ~(1 << bit);
194 }
195
196
197
198
199
200
201
202 status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
203 if (status)
204 goto again;
205
206 return IRQ_HANDLED;
207}
208
209static int tc3589x_irq_map(struct irq_domain *d, unsigned int virq,
210 irq_hw_number_t hwirq)
211{
212 struct tc3589x *tc3589x = d->host_data;
213
214 irq_set_chip_data(virq, tc3589x);
215 irq_set_chip_and_handler(virq, &dummy_irq_chip,
216 handle_edge_irq);
217 irq_set_nested_thread(virq, 1);
218#ifdef CONFIG_ARM
219 set_irq_flags(virq, IRQF_VALID);
220#else
221 irq_set_noprobe(virq);
222#endif
223
224 return 0;
225}
226
227static void tc3589x_irq_unmap(struct irq_domain *d, unsigned int virq)
228{
229#ifdef CONFIG_ARM
230 set_irq_flags(virq, 0);
231#endif
232 irq_set_chip_and_handler(virq, NULL, NULL);
233 irq_set_chip_data(virq, NULL);
234}
235
236static struct irq_domain_ops tc3589x_irq_ops = {
237 .map = tc3589x_irq_map,
238 .unmap = tc3589x_irq_unmap,
239 .xlate = irq_domain_xlate_onecell,
240};
241
242static int tc3589x_irq_init(struct tc3589x *tc3589x, struct device_node *np)
243{
244 tc3589x->domain = irq_domain_add_simple(
245 np, TC3589x_NR_INTERNAL_IRQS, 0,
246 &tc3589x_irq_ops, tc3589x);
247
248 if (!tc3589x->domain) {
249 dev_err(tc3589x->dev, "Failed to create irqdomain\n");
250 return -ENOSYS;
251 }
252
253 return 0;
254}
255
256static int tc3589x_chip_init(struct tc3589x *tc3589x)
257{
258 int manf, ver, ret;
259
260 manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
261 if (manf < 0)
262 return manf;
263
264 ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
265 if (ver < 0)
266 return ver;
267
268 if (manf != TC3589x_MANFCODE_MAGIC) {
269 dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
270 return -EINVAL;
271 }
272
273 dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
274
275
276
277
278
279
280 ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
281 TC3589x_RSTCTRL_TIMRST
282 | TC3589x_RSTCTRL_ROTRST
283 | TC3589x_RSTCTRL_KBDRST);
284 if (ret < 0)
285 return ret;
286
287
288 return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
289}
290
291static int tc3589x_device_init(struct tc3589x *tc3589x)
292{
293 int ret = 0;
294 unsigned int blocks = tc3589x->pdata->block;
295
296 if (blocks & TC3589x_BLOCK_GPIO) {
297 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
298 ARRAY_SIZE(tc3589x_dev_gpio), NULL,
299 0, tc3589x->domain);
300 if (ret) {
301 dev_err(tc3589x->dev, "failed to add gpio child\n");
302 return ret;
303 }
304 dev_info(tc3589x->dev, "added gpio block\n");
305 }
306
307 if (blocks & TC3589x_BLOCK_KEYPAD) {
308 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
309 ARRAY_SIZE(tc3589x_dev_keypad), NULL,
310 0, tc3589x->domain);
311 if (ret) {
312 dev_err(tc3589x->dev, "failed to keypad child\n");
313 return ret;
314 }
315 dev_info(tc3589x->dev, "added keypad block\n");
316 }
317
318 return ret;
319}
320
321static const struct of_device_id tc3589x_match[] = {
322
323 { .compatible = "tc3589x", .data = (void *) TC3589X_UNKNOWN },
324 { .compatible = "toshiba,tc35890", .data = (void *) TC3589X_TC35890 },
325 { .compatible = "toshiba,tc35892", .data = (void *) TC3589X_TC35892 },
326 { .compatible = "toshiba,tc35893", .data = (void *) TC3589X_TC35893 },
327 { .compatible = "toshiba,tc35894", .data = (void *) TC3589X_TC35894 },
328 { .compatible = "toshiba,tc35895", .data = (void *) TC3589X_TC35895 },
329 { .compatible = "toshiba,tc35896", .data = (void *) TC3589X_TC35896 },
330 { }
331};
332
333MODULE_DEVICE_TABLE(of, tc3589x_match);
334
335static struct tc3589x_platform_data *
336tc3589x_of_probe(struct device *dev, enum tc3589x_version *version)
337{
338 struct device_node *np = dev->of_node;
339 struct tc3589x_platform_data *pdata;
340 struct device_node *child;
341 const struct of_device_id *of_id;
342
343 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
344 if (!pdata)
345 return ERR_PTR(-ENOMEM);
346
347 of_id = of_match_device(tc3589x_match, dev);
348 if (!of_id)
349 return ERR_PTR(-ENODEV);
350 *version = (enum tc3589x_version) of_id->data;
351
352 for_each_child_of_node(np, child) {
353 if (of_device_is_compatible(child, "toshiba,tc3589x-gpio"))
354 pdata->block |= TC3589x_BLOCK_GPIO;
355 if (of_device_is_compatible(child, "toshiba,tc3589x-keypad"))
356 pdata->block |= TC3589x_BLOCK_KEYPAD;
357 }
358
359 return pdata;
360}
361
362static int tc3589x_probe(struct i2c_client *i2c,
363 const struct i2c_device_id *id)
364{
365 struct device_node *np = i2c->dev.of_node;
366 struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
367 struct tc3589x *tc3589x;
368 enum tc3589x_version version;
369 int ret;
370
371 if (!pdata) {
372 pdata = tc3589x_of_probe(&i2c->dev, &version);
373 if (IS_ERR(pdata)) {
374 dev_err(&i2c->dev, "No platform data or DT found\n");
375 return PTR_ERR(pdata);
376 }
377 } else {
378
379 version = id->driver_data;
380 }
381
382 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
383 | I2C_FUNC_SMBUS_I2C_BLOCK))
384 return -EIO;
385
386 tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
387 GFP_KERNEL);
388 if (!tc3589x)
389 return -ENOMEM;
390
391 mutex_init(&tc3589x->lock);
392
393 tc3589x->dev = &i2c->dev;
394 tc3589x->i2c = i2c;
395 tc3589x->pdata = pdata;
396
397 switch (version) {
398 case TC3589X_TC35893:
399 case TC3589X_TC35895:
400 case TC3589X_TC35896:
401 tc3589x->num_gpio = 20;
402 break;
403 case TC3589X_TC35890:
404 case TC3589X_TC35892:
405 case TC3589X_TC35894:
406 case TC3589X_UNKNOWN:
407 default:
408 tc3589x->num_gpio = 24;
409 break;
410 }
411
412 i2c_set_clientdata(i2c, tc3589x);
413
414 ret = tc3589x_chip_init(tc3589x);
415 if (ret)
416 return ret;
417
418 ret = tc3589x_irq_init(tc3589x, np);
419 if (ret)
420 return ret;
421
422 ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
423 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
424 "tc3589x", tc3589x);
425 if (ret) {
426 dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
427 return ret;
428 }
429
430 ret = tc3589x_device_init(tc3589x);
431 if (ret) {
432 dev_err(tc3589x->dev, "failed to add child devices\n");
433 return ret;
434 }
435
436 return 0;
437}
438
439static int tc3589x_remove(struct i2c_client *client)
440{
441 struct tc3589x *tc3589x = i2c_get_clientdata(client);
442
443 mfd_remove_devices(tc3589x->dev);
444
445 return 0;
446}
447
448#ifdef CONFIG_PM_SLEEP
449static int tc3589x_suspend(struct device *dev)
450{
451 struct tc3589x *tc3589x = dev_get_drvdata(dev);
452 struct i2c_client *client = tc3589x->i2c;
453 int ret = 0;
454
455
456 if (!device_may_wakeup(&client->dev))
457 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
458 TC3589x_CLKMODE_MODCTL_SLEEP);
459
460 return ret;
461}
462
463static int tc3589x_resume(struct device *dev)
464{
465 struct tc3589x *tc3589x = dev_get_drvdata(dev);
466 struct i2c_client *client = tc3589x->i2c;
467 int ret = 0;
468
469
470 if (!device_may_wakeup(&client->dev))
471 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
472 TC3589x_CLKMODE_MODCTL_OPERATION);
473
474 return ret;
475}
476#endif
477
478static SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend, tc3589x_resume);
479
480static const struct i2c_device_id tc3589x_id[] = {
481 { "tc35890", TC3589X_TC35890 },
482 { "tc35892", TC3589X_TC35892 },
483 { "tc35893", TC3589X_TC35893 },
484 { "tc35894", TC3589X_TC35894 },
485 { "tc35895", TC3589X_TC35895 },
486 { "tc35896", TC3589X_TC35896 },
487 { "tc3589x", TC3589X_UNKNOWN },
488 { }
489};
490MODULE_DEVICE_TABLE(i2c, tc3589x_id);
491
492static struct i2c_driver tc3589x_driver = {
493 .driver = {
494 .name = "tc3589x",
495 .owner = THIS_MODULE,
496 .pm = &tc3589x_dev_pm_ops,
497 .of_match_table = of_match_ptr(tc3589x_match),
498 },
499 .probe = tc3589x_probe,
500 .remove = tc3589x_remove,
501 .id_table = tc3589x_id,
502};
503
504static int __init tc3589x_init(void)
505{
506 return i2c_add_driver(&tc3589x_driver);
507}
508subsys_initcall(tc3589x_init);
509
510static void __exit tc3589x_exit(void)
511{
512 i2c_del_driver(&tc3589x_driver);
513}
514module_exit(tc3589x_exit);
515
516MODULE_LICENSE("GPL v2");
517MODULE_DESCRIPTION("TC3589x MFD core driver");
518MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
519