1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) ST-Ericsson SA 2010
4 *
5 * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
6 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
7 */
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 * enum tc3589x_version - indicates the TC3589x version
23 */
24 enum 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 * tc3589x_reg_read() - read a single TC3589x register
39 * @tc3589x: Device to read from
40 * @reg: Register to read
41 */
tc3589x_reg_read(struct tc3589x * tc3589x,u8 reg)42 int 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 }
53 EXPORT_SYMBOL_GPL(tc3589x_reg_read);
54
55 /**
56 * tc3589x_reg_write() - write a single TC3589x register
57 * @tc3589x: Device to write to
58 * @reg: Register to read
59 * @data: Value to write
60 */
tc3589x_reg_write(struct tc3589x * tc3589x,u8 reg,u8 data)61 int 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 }
72 EXPORT_SYMBOL_GPL(tc3589x_reg_write);
73
74 /**
75 * tc3589x_block_read() - read multiple TC3589x registers
76 * @tc3589x: Device to read from
77 * @reg: First register
78 * @length: Number of registers
79 * @values: Buffer to write to
80 */
tc3589x_block_read(struct tc3589x * tc3589x,u8 reg,u8 length,u8 * values)81 int 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 }
92 EXPORT_SYMBOL_GPL(tc3589x_block_read);
93
94 /**
95 * tc3589x_block_write() - write multiple TC3589x registers
96 * @tc3589x: Device to write to
97 * @reg: First register
98 * @length: Number of registers
99 * @values: Values to write
100 */
tc3589x_block_write(struct tc3589x * tc3589x,u8 reg,u8 length,const u8 * values)101 int 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 }
114 EXPORT_SYMBOL_GPL(tc3589x_block_write);
115
116 /**
117 * tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
118 * @tc3589x: Device to write to
119 * @reg: Register to write
120 * @mask: Mask of bits to set
121 * @val: Value to set
122 */
tc3589x_set_bits(struct tc3589x * tc3589x,u8 reg,u8 mask,u8 val)123 int 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
138 out:
139 mutex_unlock(&tc3589x->lock);
140 return ret;
141 }
142 EXPORT_SYMBOL_GPL(tc3589x_set_bits);
143
144 static const struct resource gpio_resources[] = {
145 {
146 .start = TC3589x_INT_GPIIRQ,
147 .end = TC3589x_INT_GPIIRQ,
148 .flags = IORESOURCE_IRQ,
149 },
150 };
151
152 static const struct resource keypad_resources[] = {
153 {
154 .start = TC3589x_INT_KBDIRQ,
155 .end = TC3589x_INT_KBDIRQ,
156 .flags = IORESOURCE_IRQ,
157 },
158 };
159
160 static 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
169 static 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
tc3589x_irq(int irq,void * data)178 static irqreturn_t tc3589x_irq(int irq, void *data)
179 {
180 struct tc3589x *tc3589x = data;
181 int status;
182
183 again:
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_find_mapping(tc3589x->domain, bit);
191
192 handle_nested_irq(virq);
193 status &= ~(1 << bit);
194 }
195
196 /*
197 * A dummy read or write (to any register) appears to be necessary to
198 * have the last interrupt clear (for example, GPIO IC write) take
199 * effect. In such a case, recheck for any interrupt which is still
200 * pending.
201 */
202 status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
203 if (status)
204 goto again;
205
206 return IRQ_HANDLED;
207 }
208
tc3589x_irq_map(struct irq_domain * d,unsigned int virq,irq_hw_number_t hwirq)209 static 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 irq_set_noprobe(virq);
219
220 return 0;
221 }
222
tc3589x_irq_unmap(struct irq_domain * d,unsigned int virq)223 static void tc3589x_irq_unmap(struct irq_domain *d, unsigned int virq)
224 {
225 irq_set_chip_and_handler(virq, NULL, NULL);
226 irq_set_chip_data(virq, NULL);
227 }
228
229 static const struct irq_domain_ops tc3589x_irq_ops = {
230 .map = tc3589x_irq_map,
231 .unmap = tc3589x_irq_unmap,
232 .xlate = irq_domain_xlate_onecell,
233 };
234
tc3589x_irq_init(struct tc3589x * tc3589x,struct device_node * np)235 static int tc3589x_irq_init(struct tc3589x *tc3589x, struct device_node *np)
236 {
237 tc3589x->domain = irq_domain_add_simple(
238 np, TC3589x_NR_INTERNAL_IRQS, 0,
239 &tc3589x_irq_ops, tc3589x);
240
241 if (!tc3589x->domain) {
242 dev_err(tc3589x->dev, "Failed to create irqdomain\n");
243 return -ENOSYS;
244 }
245
246 return 0;
247 }
248
tc3589x_chip_init(struct tc3589x * tc3589x)249 static int tc3589x_chip_init(struct tc3589x *tc3589x)
250 {
251 int manf, ver, ret;
252
253 manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
254 if (manf < 0)
255 return manf;
256
257 ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
258 if (ver < 0)
259 return ver;
260
261 if (manf != TC3589x_MANFCODE_MAGIC) {
262 dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
263 return -EINVAL;
264 }
265
266 dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
267
268 /*
269 * Put everything except the IRQ module into reset;
270 * also spare the GPIO module for any pin initialization
271 * done during pre-kernel boot
272 */
273 ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
274 TC3589x_RSTCTRL_TIMRST
275 | TC3589x_RSTCTRL_ROTRST
276 | TC3589x_RSTCTRL_KBDRST);
277 if (ret < 0)
278 return ret;
279
280 /* Clear the reset interrupt. */
281 return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
282 }
283
tc3589x_device_init(struct tc3589x * tc3589x)284 static int tc3589x_device_init(struct tc3589x *tc3589x)
285 {
286 int ret = 0;
287 unsigned int blocks = tc3589x->pdata->block;
288
289 if (blocks & TC3589x_BLOCK_GPIO) {
290 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
291 ARRAY_SIZE(tc3589x_dev_gpio), NULL,
292 0, tc3589x->domain);
293 if (ret) {
294 dev_err(tc3589x->dev, "failed to add gpio child\n");
295 return ret;
296 }
297 dev_info(tc3589x->dev, "added gpio block\n");
298 }
299
300 if (blocks & TC3589x_BLOCK_KEYPAD) {
301 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
302 ARRAY_SIZE(tc3589x_dev_keypad), NULL,
303 0, tc3589x->domain);
304 if (ret) {
305 dev_err(tc3589x->dev, "failed to keypad child\n");
306 return ret;
307 }
308 dev_info(tc3589x->dev, "added keypad block\n");
309 }
310
311 return ret;
312 }
313
314 static const struct of_device_id tc3589x_match[] = {
315 { .compatible = "toshiba,tc35890", .data = (void *) TC3589X_TC35890 },
316 { .compatible = "toshiba,tc35892", .data = (void *) TC3589X_TC35892 },
317 { .compatible = "toshiba,tc35893", .data = (void *) TC3589X_TC35893 },
318 { .compatible = "toshiba,tc35894", .data = (void *) TC3589X_TC35894 },
319 { .compatible = "toshiba,tc35895", .data = (void *) TC3589X_TC35895 },
320 { .compatible = "toshiba,tc35896", .data = (void *) TC3589X_TC35896 },
321 { }
322 };
323
324 MODULE_DEVICE_TABLE(of, tc3589x_match);
325
326 static struct tc3589x_platform_data *
tc3589x_of_probe(struct device * dev,enum tc3589x_version * version)327 tc3589x_of_probe(struct device *dev, enum tc3589x_version *version)
328 {
329 struct device_node *np = dev->of_node;
330 struct tc3589x_platform_data *pdata;
331 struct device_node *child;
332 const struct of_device_id *of_id;
333
334 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
335 if (!pdata)
336 return ERR_PTR(-ENOMEM);
337
338 of_id = of_match_device(tc3589x_match, dev);
339 if (!of_id)
340 return ERR_PTR(-ENODEV);
341 *version = (uintptr_t) of_id->data;
342
343 for_each_child_of_node(np, child) {
344 if (of_device_is_compatible(child, "toshiba,tc3589x-gpio"))
345 pdata->block |= TC3589x_BLOCK_GPIO;
346 if (of_device_is_compatible(child, "toshiba,tc3589x-keypad"))
347 pdata->block |= TC3589x_BLOCK_KEYPAD;
348 }
349
350 return pdata;
351 }
352
tc3589x_probe(struct i2c_client * i2c)353 static int tc3589x_probe(struct i2c_client *i2c)
354 {
355 const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
356 struct device_node *np = i2c->dev.of_node;
357 struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
358 struct tc3589x *tc3589x;
359 enum tc3589x_version version;
360 int ret;
361
362 if (!pdata) {
363 pdata = tc3589x_of_probe(&i2c->dev, &version);
364 if (IS_ERR(pdata)) {
365 dev_err(&i2c->dev, "No platform data or DT found\n");
366 return PTR_ERR(pdata);
367 }
368 } else {
369 /* When not probing from device tree we have this ID */
370 version = id->driver_data;
371 }
372
373 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
374 | I2C_FUNC_SMBUS_I2C_BLOCK))
375 return -EIO;
376
377 tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
378 GFP_KERNEL);
379 if (!tc3589x)
380 return -ENOMEM;
381
382 mutex_init(&tc3589x->lock);
383
384 tc3589x->dev = &i2c->dev;
385 tc3589x->i2c = i2c;
386 tc3589x->pdata = pdata;
387
388 switch (version) {
389 case TC3589X_TC35893:
390 case TC3589X_TC35895:
391 case TC3589X_TC35896:
392 tc3589x->num_gpio = 20;
393 break;
394 case TC3589X_TC35890:
395 case TC3589X_TC35892:
396 case TC3589X_TC35894:
397 case TC3589X_UNKNOWN:
398 default:
399 tc3589x->num_gpio = 24;
400 break;
401 }
402
403 i2c_set_clientdata(i2c, tc3589x);
404
405 ret = tc3589x_chip_init(tc3589x);
406 if (ret)
407 return ret;
408
409 ret = tc3589x_irq_init(tc3589x, np);
410 if (ret)
411 return ret;
412
413 ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
414 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
415 "tc3589x", tc3589x);
416 if (ret) {
417 dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
418 return ret;
419 }
420
421 ret = tc3589x_device_init(tc3589x);
422 if (ret) {
423 dev_err(tc3589x->dev, "failed to add child devices\n");
424 return ret;
425 }
426
427 return 0;
428 }
429
tc3589x_remove(struct i2c_client * client)430 static void tc3589x_remove(struct i2c_client *client)
431 {
432 struct tc3589x *tc3589x = i2c_get_clientdata(client);
433
434 mfd_remove_devices(tc3589x->dev);
435 }
436
tc3589x_suspend(struct device * dev)437 static int tc3589x_suspend(struct device *dev)
438 {
439 struct tc3589x *tc3589x = dev_get_drvdata(dev);
440 struct i2c_client *client = tc3589x->i2c;
441 int ret = 0;
442
443 /* put the system to sleep mode */
444 if (!device_may_wakeup(&client->dev))
445 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
446 TC3589x_CLKMODE_MODCTL_SLEEP);
447
448 return ret;
449 }
450
tc3589x_resume(struct device * dev)451 static int tc3589x_resume(struct device *dev)
452 {
453 struct tc3589x *tc3589x = dev_get_drvdata(dev);
454 struct i2c_client *client = tc3589x->i2c;
455 int ret = 0;
456
457 /* enable the system into operation */
458 if (!device_may_wakeup(&client->dev))
459 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
460 TC3589x_CLKMODE_MODCTL_OPERATION);
461
462 return ret;
463 }
464
465 static DEFINE_SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops,
466 tc3589x_suspend, tc3589x_resume);
467
468 static const struct i2c_device_id tc3589x_id[] = {
469 { "tc35890", TC3589X_TC35890 },
470 { "tc35892", TC3589X_TC35892 },
471 { "tc35893", TC3589X_TC35893 },
472 { "tc35894", TC3589X_TC35894 },
473 { "tc35895", TC3589X_TC35895 },
474 { "tc35896", TC3589X_TC35896 },
475 { "tc3589x", TC3589X_UNKNOWN },
476 { }
477 };
478 MODULE_DEVICE_TABLE(i2c, tc3589x_id);
479
480 static struct i2c_driver tc3589x_driver = {
481 .driver = {
482 .name = "tc3589x",
483 .pm = pm_sleep_ptr(&tc3589x_dev_pm_ops),
484 .of_match_table = tc3589x_match,
485 },
486 .probe = tc3589x_probe,
487 .remove = tc3589x_remove,
488 .id_table = tc3589x_id,
489 };
490
tc3589x_init(void)491 static int __init tc3589x_init(void)
492 {
493 return i2c_add_driver(&tc3589x_driver);
494 }
495 subsys_initcall(tc3589x_init);
496
tc3589x_exit(void)497 static void __exit tc3589x_exit(void)
498 {
499 i2c_del_driver(&tc3589x_driver);
500 }
501 module_exit(tc3589x_exit);
502
503 MODULE_DESCRIPTION("TC3589x MFD core driver");
504 MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
505