2 * Copyright (C) ST-Ericsson SA 2010
4 * License Terms: GNU General Public License, version 2
5 * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
6 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
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>
16 #include <linux/of_device.h>
17 #include <linux/mfd/core.h>
18 #include <linux/mfd/tc3589x.h>
19 #include <linux/err.h>
22 * enum tc3589x_version - indicates the TC3589x version
24 enum tc3589x_version {
34 #define TC3589x_CLKMODE_MODCTL_SLEEP 0x0
35 #define TC3589x_CLKMODE_MODCTL_OPERATION (1 << 0)
38 * tc3589x_reg_read() - read a single TC3589x register
39 * @tc3589x: Device to read from
40 * @reg: Register to read
42 int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
46 ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
48 dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
53 EXPORT_SYMBOL_GPL(tc3589x_reg_read);
56 * tc3589x_reg_read() - write a single TC3589x register
57 * @tc3589x: Device to write to
58 * @reg: Register to read
59 * @data: Value to write
61 int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
65 ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
67 dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
72 EXPORT_SYMBOL_GPL(tc3589x_reg_write);
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
81 int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values)
85 ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
87 dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
92 EXPORT_SYMBOL_GPL(tc3589x_block_read);
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
101 int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
106 ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
109 dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
114 EXPORT_SYMBOL_GPL(tc3589x_block_write);
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 * @values: Value to set
123 int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
127 mutex_lock(&tc3589x->lock);
129 ret = tc3589x_reg_read(tc3589x, reg);
136 ret = tc3589x_reg_write(tc3589x, reg, ret);
139 mutex_unlock(&tc3589x->lock);
142 EXPORT_SYMBOL_GPL(tc3589x_set_bits);
144 static struct resource gpio_resources[] = {
146 .start = TC3589x_INT_GPIIRQ,
147 .end = TC3589x_INT_GPIIRQ,
148 .flags = IORESOURCE_IRQ,
152 static struct resource keypad_resources[] = {
154 .start = TC3589x_INT_KBDIRQ,
155 .end = TC3589x_INT_KBDIRQ,
156 .flags = IORESOURCE_IRQ,
160 static const struct mfd_cell tc3589x_dev_gpio[] = {
162 .name = "tc3589x-gpio",
163 .num_resources = ARRAY_SIZE(gpio_resources),
164 .resources = &gpio_resources[0],
165 .of_compatible = "toshiba,tc3589x-gpio",
169 static const struct mfd_cell tc3589x_dev_keypad[] = {
171 .name = "tc3589x-keypad",
172 .num_resources = ARRAY_SIZE(keypad_resources),
173 .resources = &keypad_resources[0],
174 .of_compatible = "toshiba,tc3589x-keypad",
178 static irqreturn_t tc3589x_irq(int irq, void *data)
180 struct tc3589x *tc3589x = data;
184 status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
189 int bit = __ffs(status);
190 int virq = irq_create_mapping(tc3589x->domain, bit);
192 handle_nested_irq(virq);
193 status &= ~(1 << bit);
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
202 status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
209 static int tc3589x_irq_map(struct irq_domain *d, unsigned int virq,
210 irq_hw_number_t hwirq)
212 struct tc3589x *tc3589x = d->host_data;
214 irq_set_chip_data(virq, tc3589x);
215 irq_set_chip_and_handler(virq, &dummy_irq_chip,
217 irq_set_nested_thread(virq, 1);
219 set_irq_flags(virq, IRQF_VALID);
221 irq_set_noprobe(virq);
227 static void tc3589x_irq_unmap(struct irq_domain *d, unsigned int virq)
230 set_irq_flags(virq, 0);
232 irq_set_chip_and_handler(virq, NULL, NULL);
233 irq_set_chip_data(virq, NULL);
236 static struct irq_domain_ops tc3589x_irq_ops = {
237 .map = tc3589x_irq_map,
238 .unmap = tc3589x_irq_unmap,
239 .xlate = irq_domain_xlate_onecell,
242 static int tc3589x_irq_init(struct tc3589x *tc3589x, struct device_node *np)
244 tc3589x->domain = irq_domain_add_simple(
245 np, TC3589x_NR_INTERNAL_IRQS, 0,
246 &tc3589x_irq_ops, tc3589x);
248 if (!tc3589x->domain) {
249 dev_err(tc3589x->dev, "Failed to create irqdomain\n");
256 static int tc3589x_chip_init(struct tc3589x *tc3589x)
260 manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
264 ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
268 if (manf != TC3589x_MANFCODE_MAGIC) {
269 dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
273 dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
276 * Put everything except the IRQ module into reset;
277 * also spare the GPIO module for any pin initialization
278 * done during pre-kernel boot
280 ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
281 TC3589x_RSTCTRL_TIMRST
282 | TC3589x_RSTCTRL_ROTRST
283 | TC3589x_RSTCTRL_KBDRST);
287 /* Clear the reset interrupt. */
288 return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
291 static int tc3589x_device_init(struct tc3589x *tc3589x)
294 unsigned int blocks = tc3589x->pdata->block;
296 if (blocks & TC3589x_BLOCK_GPIO) {
297 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
298 ARRAY_SIZE(tc3589x_dev_gpio), NULL,
301 dev_err(tc3589x->dev, "failed to add gpio child\n");
304 dev_info(tc3589x->dev, "added gpio block\n");
307 if (blocks & TC3589x_BLOCK_KEYPAD) {
308 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
309 ARRAY_SIZE(tc3589x_dev_keypad), NULL,
312 dev_err(tc3589x->dev, "failed to keypad child\n");
315 dev_info(tc3589x->dev, "added keypad block\n");
322 static const struct of_device_id tc3589x_match[] = {
323 /* Legacy compatible string */
324 { .compatible = "tc3589x", .data = (void *) TC3589X_UNKNOWN },
325 { .compatible = "toshiba,tc35890", .data = (void *) TC3589X_TC35890 },
326 { .compatible = "toshiba,tc35892", .data = (void *) TC3589X_TC35892 },
327 { .compatible = "toshiba,tc35893", .data = (void *) TC3589X_TC35893 },
328 { .compatible = "toshiba,tc35894", .data = (void *) TC3589X_TC35894 },
329 { .compatible = "toshiba,tc35895", .data = (void *) TC3589X_TC35895 },
330 { .compatible = "toshiba,tc35896", .data = (void *) TC3589X_TC35896 },
334 MODULE_DEVICE_TABLE(of, tc3589x_match);
336 static struct tc3589x_platform_data *
337 tc3589x_of_probe(struct device *dev, enum tc3589x_version *version)
339 struct device_node *np = dev->of_node;
340 struct tc3589x_platform_data *pdata;
341 struct device_node *child;
342 const struct of_device_id *of_id;
344 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
346 return ERR_PTR(-ENOMEM);
348 of_id = of_match_device(tc3589x_match, dev);
350 return ERR_PTR(-ENODEV);
351 *version = (enum tc3589x_version) of_id->data;
353 for_each_child_of_node(np, child) {
354 if (of_device_is_compatible(child, "toshiba,tc3589x-gpio"))
355 pdata->block |= TC3589x_BLOCK_GPIO;
356 if (of_device_is_compatible(child, "toshiba,tc3589x-keypad"))
357 pdata->block |= TC3589x_BLOCK_KEYPAD;
363 static inline struct tc3589x_platform_data *
364 tc3589x_of_probe(struct device *dev, enum tc3589x_version *version)
366 dev_err(dev, "no device tree support\n");
367 return ERR_PTR(-ENODEV);
371 static int tc3589x_probe(struct i2c_client *i2c,
372 const struct i2c_device_id *id)
374 struct device_node *np = i2c->dev.of_node;
375 struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
376 struct tc3589x *tc3589x;
377 enum tc3589x_version version;
381 pdata = tc3589x_of_probe(&i2c->dev, &version);
383 dev_err(&i2c->dev, "No platform data or DT found\n");
384 return PTR_ERR(pdata);
387 /* When not probing from device tree we have this ID */
388 version = id->driver_data;
391 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
392 | I2C_FUNC_SMBUS_I2C_BLOCK))
395 tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
400 mutex_init(&tc3589x->lock);
402 tc3589x->dev = &i2c->dev;
404 tc3589x->pdata = pdata;
407 case TC3589X_TC35893:
408 case TC3589X_TC35895:
409 case TC3589X_TC35896:
410 tc3589x->num_gpio = 20;
412 case TC3589X_TC35890:
413 case TC3589X_TC35892:
414 case TC3589X_TC35894:
415 case TC3589X_UNKNOWN:
417 tc3589x->num_gpio = 24;
421 i2c_set_clientdata(i2c, tc3589x);
423 ret = tc3589x_chip_init(tc3589x);
427 ret = tc3589x_irq_init(tc3589x, np);
431 ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
432 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
435 dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
439 ret = tc3589x_device_init(tc3589x);
441 dev_err(tc3589x->dev, "failed to add child devices\n");
448 static int tc3589x_remove(struct i2c_client *client)
450 struct tc3589x *tc3589x = i2c_get_clientdata(client);
452 mfd_remove_devices(tc3589x->dev);
457 #ifdef CONFIG_PM_SLEEP
458 static int tc3589x_suspend(struct device *dev)
460 struct tc3589x *tc3589x = dev_get_drvdata(dev);
461 struct i2c_client *client = tc3589x->i2c;
464 /* put the system to sleep mode */
465 if (!device_may_wakeup(&client->dev))
466 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
467 TC3589x_CLKMODE_MODCTL_SLEEP);
472 static int tc3589x_resume(struct device *dev)
474 struct tc3589x *tc3589x = dev_get_drvdata(dev);
475 struct i2c_client *client = tc3589x->i2c;
478 /* enable the system into operation */
479 if (!device_may_wakeup(&client->dev))
480 ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
481 TC3589x_CLKMODE_MODCTL_OPERATION);
487 static SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend, tc3589x_resume);
489 static const struct i2c_device_id tc3589x_id[] = {
490 { "tc35890", TC3589X_TC35890 },
491 { "tc35892", TC3589X_TC35892 },
492 { "tc35893", TC3589X_TC35893 },
493 { "tc35894", TC3589X_TC35894 },
494 { "tc35895", TC3589X_TC35895 },
495 { "tc35896", TC3589X_TC35896 },
496 { "tc3589x", TC3589X_UNKNOWN },
499 MODULE_DEVICE_TABLE(i2c, tc3589x_id);
501 static struct i2c_driver tc3589x_driver = {
504 .owner = THIS_MODULE,
505 .pm = &tc3589x_dev_pm_ops,
506 .of_match_table = of_match_ptr(tc3589x_match),
508 .probe = tc3589x_probe,
509 .remove = tc3589x_remove,
510 .id_table = tc3589x_id,
513 static int __init tc3589x_init(void)
515 return i2c_add_driver(&tc3589x_driver);
517 subsys_initcall(tc3589x_init);
519 static void __exit tc3589x_exit(void)
521 i2c_del_driver(&tc3589x_driver);
523 module_exit(tc3589x_exit);
525 MODULE_LICENSE("GPL v2");
526 MODULE_DESCRIPTION("TC3589x MFD core driver");
527 MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");