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1/*
2 * GPIO Chip driver for Analog Devices
3 * ADP5588/ADP5587 I/O Expander and QWERTY Keypad Controller
4 *
5 * Copyright 2009-2010 Analog Devices Inc.
6 *
7 * Licensed under the GPL-2 or later.
8 */
9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/slab.h>
13#include <linux/init.h>
14#include <linux/i2c.h>
15#include <linux/gpio.h>
16#include <linux/interrupt.h>
17#include <linux/irq.h>
18
19#include <linux/i2c/adp5588.h>
20
21#define DRV_NAME "adp5588-gpio"
22
23/*
24 * Early pre 4.0 Silicon required to delay readout by at least 25ms,
25 * since the Event Counter Register updated 25ms after the interrupt
26 * asserted.
27 */
28#define WA_DELAYED_READOUT_REVID(rev) ((rev) < 4)
29
30struct adp5588_gpio {
31 struct i2c_client *client;
32 struct gpio_chip gpio_chip;
33 struct mutex lock; /* protect cached dir, dat_out */
34 /* protect serialized access to the interrupt controller bus */
35 struct mutex irq_lock;
36 unsigned gpio_start;
37 unsigned irq_base;
38 uint8_t dat_out[3];
39 uint8_t dir[3];
40 uint8_t int_lvl[3];
41 uint8_t int_en[3];
42 uint8_t irq_mask[3];
43 uint8_t irq_stat[3];
44};
45
46static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
47{
48 int ret = i2c_smbus_read_byte_data(client, reg);
49
50 if (ret < 0)
51 dev_err(&client->dev, "Read Error\n");
52
53 return ret;
54}
55
56static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)
57{
58 int ret = i2c_smbus_write_byte_data(client, reg, val);
59
60 if (ret < 0)
61 dev_err(&client->dev, "Write Error\n");
62
63 return ret;
64}
65
66static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
67{
68 struct adp5588_gpio *dev =
69 container_of(chip, struct adp5588_gpio, gpio_chip);
70
71 return !!(adp5588_gpio_read(dev->client,
72 GPIO_DAT_STAT1 + ADP5588_BANK(off)) & ADP5588_BIT(off));
73}
74
75static void adp5588_gpio_set_value(struct gpio_chip *chip,
76 unsigned off, int val)
77{
78 unsigned bank, bit;
79 struct adp5588_gpio *dev =
80 container_of(chip, struct adp5588_gpio, gpio_chip);
81
82 bank = ADP5588_BANK(off);
83 bit = ADP5588_BIT(off);
84
85 mutex_lock(&dev->lock);
86 if (val)
87 dev->dat_out[bank] |= bit;
88 else
89 dev->dat_out[bank] &= ~bit;
90
91 adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
92 dev->dat_out[bank]);
93 mutex_unlock(&dev->lock);
94}
95
96static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
97{
98 int ret;
99 unsigned bank;
100 struct adp5588_gpio *dev =
101 container_of(chip, struct adp5588_gpio, gpio_chip);
102
103 bank = ADP5588_BANK(off);
104
105 mutex_lock(&dev->lock);
106 dev->dir[bank] &= ~ADP5588_BIT(off);
107 ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
108 mutex_unlock(&dev->lock);
109
110 return ret;
111}
112
113static int adp5588_gpio_direction_output(struct gpio_chip *chip,
114 unsigned off, int val)
115{
116 int ret;
117 unsigned bank, bit;
118 struct adp5588_gpio *dev =
119 container_of(chip, struct adp5588_gpio, gpio_chip);
120
121 bank = ADP5588_BANK(off);
122 bit = ADP5588_BIT(off);
123
124 mutex_lock(&dev->lock);
125 dev->dir[bank] |= bit;
126
127 if (val)
128 dev->dat_out[bank] |= bit;
129 else
130 dev->dat_out[bank] &= ~bit;
131
132 ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
133 dev->dat_out[bank]);
134 ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank,
135 dev->dir[bank]);
136 mutex_unlock(&dev->lock);
137
138 return ret;
139}
140
141#ifdef CONFIG_GPIO_ADP5588_IRQ
142static int adp5588_gpio_to_irq(struct gpio_chip *chip, unsigned off)
143{
144 struct adp5588_gpio *dev =
145 container_of(chip, struct adp5588_gpio, gpio_chip);
146 return dev->irq_base + off;
147}
148
149static void adp5588_irq_bus_lock(struct irq_data *d)
150{
151 struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
152
153 mutex_lock(&dev->irq_lock);
154}
155
156 /*
157 * genirq core code can issue chip->mask/unmask from atomic context.
158 * This doesn't work for slow busses where an access needs to sleep.
159 * bus_sync_unlock() is therefore called outside the atomic context,
160 * syncs the current irq mask state with the slow external controller
161 * and unlocks the bus.
162 */
163
164static void adp5588_irq_bus_sync_unlock(struct irq_data *d)
165{
166 struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
167 int i;
168
169 for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++)
170 if (dev->int_en[i] ^ dev->irq_mask[i]) {
171 dev->int_en[i] = dev->irq_mask[i];
172 adp5588_gpio_write(dev->client, GPIO_INT_EN1 + i,
173 dev->int_en[i]);
174 }
175
176 mutex_unlock(&dev->irq_lock);
177}
178
179static void adp5588_irq_mask(struct irq_data *d)
180{
181 struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
182 unsigned gpio = d->irq - dev->irq_base;
183
184 dev->irq_mask[ADP5588_BANK(gpio)] &= ~ADP5588_BIT(gpio);
185}
186
187static void adp5588_irq_unmask(struct irq_data *d)
188{
189 struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
190 unsigned gpio = d->irq - dev->irq_base;
191
192 dev->irq_mask[ADP5588_BANK(gpio)] |= ADP5588_BIT(gpio);
193}
194
195static int adp5588_irq_set_type(struct irq_data *d, unsigned int type)
196{
197 struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
198 uint16_t gpio = d->irq - dev->irq_base;
199 unsigned bank, bit;
200
201 if ((type & IRQ_TYPE_EDGE_BOTH)) {
202 dev_err(&dev->client->dev, "irq %d: unsupported type %d\n",
203 d->irq, type);
204 return -EINVAL;
205 }
206
207 bank = ADP5588_BANK(gpio);
208 bit = ADP5588_BIT(gpio);
209
210 if (type & IRQ_TYPE_LEVEL_HIGH)
211 dev->int_lvl[bank] |= bit;
212 else if (type & IRQ_TYPE_LEVEL_LOW)
213 dev->int_lvl[bank] &= ~bit;
214 else
215 return -EINVAL;
216
217 adp5588_gpio_direction_input(&dev->gpio_chip, gpio);
218 adp5588_gpio_write(dev->client, GPIO_INT_LVL1 + bank,
219 dev->int_lvl[bank]);
220
221 return 0;
222}
223
224static struct irq_chip adp5588_irq_chip = {
225 .name = "adp5588",
226 .irq_mask = adp5588_irq_mask,
227 .irq_unmask = adp5588_irq_unmask,
228 .irq_bus_lock = adp5588_irq_bus_lock,
229 .irq_bus_sync_unlock = adp5588_irq_bus_sync_unlock,
230 .irq_set_type = adp5588_irq_set_type,
231};
232
233static int adp5588_gpio_read_intstat(struct i2c_client *client, u8 *buf)
234{
235 int ret = i2c_smbus_read_i2c_block_data(client, GPIO_INT_STAT1, 3, buf);
236
237 if (ret < 0)
238 dev_err(&client->dev, "Read INT_STAT Error\n");
239
240 return ret;
241}
242
243static irqreturn_t adp5588_irq_handler(int irq, void *devid)
244{
245 struct adp5588_gpio *dev = devid;
246 unsigned status, bank, bit, pending;
247 int ret;
248 status = adp5588_gpio_read(dev->client, INT_STAT);
249
250 if (status & ADP5588_GPI_INT) {
251 ret = adp5588_gpio_read_intstat(dev->client, dev->irq_stat);
252 if (ret < 0)
253 memset(dev->irq_stat, 0, ARRAY_SIZE(dev->irq_stat));
254
255 for (bank = 0; bank <= ADP5588_BANK(ADP5588_MAXGPIO);
256 bank++, bit = 0) {
257 pending = dev->irq_stat[bank] & dev->irq_mask[bank];
258
259 while (pending) {
260 if (pending & (1 << bit)) {
261 handle_nested_irq(dev->irq_base +
262 (bank << 3) + bit);
263 pending &= ~(1 << bit);
264
265 }
266 bit++;
267 }
268 }
269 }
270
271 adp5588_gpio_write(dev->client, INT_STAT, status); /* Status is W1C */
272
273 return IRQ_HANDLED;
274}
275
276static int adp5588_irq_setup(struct adp5588_gpio *dev)
277{
278 struct i2c_client *client = dev->client;
279 struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
280 unsigned gpio;
281 int ret;
282
283 adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC);
284 adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */
285 adp5588_gpio_read_intstat(client, dev->irq_stat); /* read to clear */
286
287 dev->irq_base = pdata->irq_base;
288 mutex_init(&dev->irq_lock);
289
290 for (gpio = 0; gpio < dev->gpio_chip.ngpio; gpio++) {
291 int irq = gpio + dev->irq_base;
292 irq_set_chip_data(irq, dev);
293 irq_set_chip_and_handler(irq, &adp5588_irq_chip,
294 handle_level_irq);
295 irq_set_nested_thread(irq, 1);
296#ifdef CONFIG_ARM
297 /*
298 * ARM needs us to explicitly flag the IRQ as VALID,
299 * once we do so, it will also set the noprobe.
300 */
301 set_irq_flags(irq, IRQF_VALID);
302#else
303 irq_set_noprobe(irq);
304#endif
305 }
306
307 ret = request_threaded_irq(client->irq,
308 NULL,
309 adp5588_irq_handler,
310 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
311 dev_name(&client->dev), dev);
312 if (ret) {
313 dev_err(&client->dev, "failed to request irq %d\n",
314 client->irq);
315 goto out;
316 }
317
318 dev->gpio_chip.to_irq = adp5588_gpio_to_irq;
319 adp5588_gpio_write(client, CFG,
320 ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_GPI_INT);
321
322 return 0;
323
324out:
325 dev->irq_base = 0;
326 return ret;
327}
328
329static void adp5588_irq_teardown(struct adp5588_gpio *dev)
330{
331 if (dev->irq_base)
332 free_irq(dev->client->irq, dev);
333}
334
335#else
336static int adp5588_irq_setup(struct adp5588_gpio *dev)
337{
338 struct i2c_client *client = dev->client;
339 dev_warn(&client->dev, "interrupt support not compiled in\n");
340
341 return 0;
342}
343
344static void adp5588_irq_teardown(struct adp5588_gpio *dev)
345{
346}
347#endif /* CONFIG_GPIO_ADP5588_IRQ */
348
349static int __devinit adp5588_gpio_probe(struct i2c_client *client,
350 const struct i2c_device_id *id)
351{
352 struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
353 struct adp5588_gpio *dev;
354 struct gpio_chip *gc;
355 int ret, i, revid;
356
357 if (pdata == NULL) {
358 dev_err(&client->dev, "missing platform data\n");
359 return -ENODEV;
360 }
361
362 if (!i2c_check_functionality(client->adapter,
363 I2C_FUNC_SMBUS_BYTE_DATA)) {
364 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
365 return -EIO;
366 }
367
368 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
369 if (dev == NULL) {
370 dev_err(&client->dev, "failed to alloc memory\n");
371 return -ENOMEM;
372 }
373
374 dev->client = client;
375
376 gc = &dev->gpio_chip;
377 gc->direction_input = adp5588_gpio_direction_input;
378 gc->direction_output = adp5588_gpio_direction_output;
379 gc->get = adp5588_gpio_get_value;
380 gc->set = adp5588_gpio_set_value;
381 gc->can_sleep = 1;
382
383 gc->base = pdata->gpio_start;
384 gc->ngpio = ADP5588_MAXGPIO;
385 gc->label = client->name;
386 gc->owner = THIS_MODULE;
387
388 mutex_init(&dev->lock);
389
390 ret = adp5588_gpio_read(dev->client, DEV_ID);
391 if (ret < 0)
392 goto err;
393
394 revid = ret & ADP5588_DEVICE_ID_MASK;
395
396 for (i = 0, ret = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
397 dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
398 dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
399 ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
400 ret |= adp5588_gpio_write(client, GPIO_PULL1 + i,
401 (pdata->pullup_dis_mask >> (8 * i)) & 0xFF);
402 ret |= adp5588_gpio_write(client, GPIO_INT_EN1 + i, 0);
403 if (ret)
404 goto err;
405 }
406
407 if (pdata->irq_base) {
408 if (WA_DELAYED_READOUT_REVID(revid)) {
409 dev_warn(&client->dev, "GPIO int not supported\n");
410 } else {
411 ret = adp5588_irq_setup(dev);
412 if (ret)
413 goto err;
414 }
415 }
416
417 ret = gpiochip_add(&dev->gpio_chip);
418 if (ret)
419 goto err_irq;
420
421 dev_info(&client->dev, "gpios %d..%d (IRQ Base %d) on a %s Rev. %d\n",
422 gc->base, gc->base + gc->ngpio - 1,
423 pdata->irq_base, client->name, revid);
424
425 if (pdata->setup) {
426 ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
427 if (ret < 0)
428 dev_warn(&client->dev, "setup failed, %d\n", ret);
429 }
430
431 i2c_set_clientdata(client, dev);
432
433 return 0;
434
435err_irq:
436 adp5588_irq_teardown(dev);
437err:
438 kfree(dev);
439 return ret;
440}
441
442static int __devexit adp5588_gpio_remove(struct i2c_client *client)
443{
444 struct adp5588_gpio_platform_data *pdata = client->dev.platform_data;
445 struct adp5588_gpio *dev = i2c_get_clientdata(client);
446 int ret;
447
448 if (pdata->teardown) {
449 ret = pdata->teardown(client,
450 dev->gpio_chip.base, dev->gpio_chip.ngpio,
451 pdata->context);
452 if (ret < 0) {
453 dev_err(&client->dev, "teardown failed %d\n", ret);
454 return ret;
455 }
456 }
457
458 if (dev->irq_base)
459 free_irq(dev->client->irq, dev);
460
461 ret = gpiochip_remove(&dev->gpio_chip);
462 if (ret) {
463 dev_err(&client->dev, "gpiochip_remove failed %d\n", ret);
464 return ret;
465 }
466
467 kfree(dev);
468 return 0;
469}
470
471static const struct i2c_device_id adp5588_gpio_id[] = {
472 {DRV_NAME, 0},
473 {}
474};
475
476MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);
477
478static struct i2c_driver adp5588_gpio_driver = {
479 .driver = {
480 .name = DRV_NAME,
481 },
482 .probe = adp5588_gpio_probe,
483 .remove = __devexit_p(adp5588_gpio_remove),
484 .id_table = adp5588_gpio_id,
485};
486
487static int __init adp5588_gpio_init(void)
488{
489 return i2c_add_driver(&adp5588_gpio_driver);
490}
491
492module_init(adp5588_gpio_init);
493
494static void __exit adp5588_gpio_exit(void)
495{
496 i2c_del_driver(&adp5588_gpio_driver);
497}
498
499module_exit(adp5588_gpio_exit);
500
501MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
502MODULE_DESCRIPTION("GPIO ADP5588 Driver");
503MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * GPIO Chip driver for Analog Devices
4 * ADP5588/ADP5587 I/O Expander and QWERTY Keypad Controller
5 *
6 * Copyright 2009-2010 Analog Devices Inc.
7 */
8
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/slab.h>
12#include <linux/init.h>
13#include <linux/i2c.h>
14#include <linux/gpio/driver.h>
15#include <linux/interrupt.h>
16#include <linux/irq.h>
17#include <linux/of_device.h>
18
19#include <linux/platform_data/adp5588.h>
20
21#define DRV_NAME "adp5588-gpio"
22
23/*
24 * Early pre 4.0 Silicon required to delay readout by at least 25ms,
25 * since the Event Counter Register updated 25ms after the interrupt
26 * asserted.
27 */
28#define WA_DELAYED_READOUT_REVID(rev) ((rev) < 4)
29
30struct adp5588_gpio {
31 struct i2c_client *client;
32 struct gpio_chip gpio_chip;
33 struct mutex lock; /* protect cached dir, dat_out */
34 /* protect serialized access to the interrupt controller bus */
35 struct mutex irq_lock;
36 uint8_t dat_out[3];
37 uint8_t dir[3];
38 uint8_t int_lvl_low[3];
39 uint8_t int_lvl_high[3];
40 uint8_t int_en[3];
41 uint8_t irq_mask[3];
42 uint8_t int_input_en[3];
43};
44
45static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
46{
47 int ret = i2c_smbus_read_byte_data(client, reg);
48
49 if (ret < 0)
50 dev_err(&client->dev, "Read Error\n");
51
52 return ret;
53}
54
55static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)
56{
57 int ret = i2c_smbus_write_byte_data(client, reg, val);
58
59 if (ret < 0)
60 dev_err(&client->dev, "Write Error\n");
61
62 return ret;
63}
64
65static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
66{
67 struct adp5588_gpio *dev = gpiochip_get_data(chip);
68 unsigned bank = ADP5588_BANK(off);
69 unsigned bit = ADP5588_BIT(off);
70 int val;
71
72 mutex_lock(&dev->lock);
73
74 if (dev->dir[bank] & bit)
75 val = dev->dat_out[bank];
76 else
77 val = adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + bank);
78
79 mutex_unlock(&dev->lock);
80
81 return !!(val & bit);
82}
83
84static void adp5588_gpio_set_value(struct gpio_chip *chip,
85 unsigned off, int val)
86{
87 unsigned bank, bit;
88 struct adp5588_gpio *dev = gpiochip_get_data(chip);
89
90 bank = ADP5588_BANK(off);
91 bit = ADP5588_BIT(off);
92
93 mutex_lock(&dev->lock);
94 if (val)
95 dev->dat_out[bank] |= bit;
96 else
97 dev->dat_out[bank] &= ~bit;
98
99 adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
100 dev->dat_out[bank]);
101 mutex_unlock(&dev->lock);
102}
103
104static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
105{
106 int ret;
107 unsigned bank;
108 struct adp5588_gpio *dev = gpiochip_get_data(chip);
109
110 bank = ADP5588_BANK(off);
111
112 mutex_lock(&dev->lock);
113 dev->dir[bank] &= ~ADP5588_BIT(off);
114 ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
115 mutex_unlock(&dev->lock);
116
117 return ret;
118}
119
120static int adp5588_gpio_direction_output(struct gpio_chip *chip,
121 unsigned off, int val)
122{
123 int ret;
124 unsigned bank, bit;
125 struct adp5588_gpio *dev = gpiochip_get_data(chip);
126
127 bank = ADP5588_BANK(off);
128 bit = ADP5588_BIT(off);
129
130 mutex_lock(&dev->lock);
131 dev->dir[bank] |= bit;
132
133 if (val)
134 dev->dat_out[bank] |= bit;
135 else
136 dev->dat_out[bank] &= ~bit;
137
138 ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
139 dev->dat_out[bank]);
140 ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank,
141 dev->dir[bank]);
142 mutex_unlock(&dev->lock);
143
144 return ret;
145}
146
147#ifdef CONFIG_GPIO_ADP5588_IRQ
148
149static void adp5588_irq_bus_lock(struct irq_data *d)
150{
151 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
152 struct adp5588_gpio *dev = gpiochip_get_data(gc);
153
154 mutex_lock(&dev->irq_lock);
155}
156
157 /*
158 * genirq core code can issue chip->mask/unmask from atomic context.
159 * This doesn't work for slow busses where an access needs to sleep.
160 * bus_sync_unlock() is therefore called outside the atomic context,
161 * syncs the current irq mask state with the slow external controller
162 * and unlocks the bus.
163 */
164
165static void adp5588_irq_bus_sync_unlock(struct irq_data *d)
166{
167 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
168 struct adp5588_gpio *dev = gpiochip_get_data(gc);
169 int i;
170
171 for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
172 if (dev->int_input_en[i]) {
173 mutex_lock(&dev->lock);
174 dev->dir[i] &= ~dev->int_input_en[i];
175 dev->int_input_en[i] = 0;
176 adp5588_gpio_write(dev->client, GPIO_DIR1 + i,
177 dev->dir[i]);
178 mutex_unlock(&dev->lock);
179 }
180
181 if (dev->int_en[i] ^ dev->irq_mask[i]) {
182 dev->int_en[i] = dev->irq_mask[i];
183 adp5588_gpio_write(dev->client, GPI_EM1 + i,
184 dev->int_en[i]);
185 }
186 }
187
188 mutex_unlock(&dev->irq_lock);
189}
190
191static void adp5588_irq_mask(struct irq_data *d)
192{
193 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
194 struct adp5588_gpio *dev = gpiochip_get_data(gc);
195
196 dev->irq_mask[ADP5588_BANK(d->hwirq)] &= ~ADP5588_BIT(d->hwirq);
197}
198
199static void adp5588_irq_unmask(struct irq_data *d)
200{
201 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
202 struct adp5588_gpio *dev = gpiochip_get_data(gc);
203
204 dev->irq_mask[ADP5588_BANK(d->hwirq)] |= ADP5588_BIT(d->hwirq);
205}
206
207static int adp5588_irq_set_type(struct irq_data *d, unsigned int type)
208{
209 struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
210 struct adp5588_gpio *dev = gpiochip_get_data(gc);
211 uint16_t gpio = d->hwirq;
212 unsigned bank, bit;
213
214 bank = ADP5588_BANK(gpio);
215 bit = ADP5588_BIT(gpio);
216
217 dev->int_lvl_low[bank] &= ~bit;
218 dev->int_lvl_high[bank] &= ~bit;
219
220 if (type & IRQ_TYPE_EDGE_BOTH || type & IRQ_TYPE_LEVEL_HIGH)
221 dev->int_lvl_high[bank] |= bit;
222
223 if (type & IRQ_TYPE_EDGE_BOTH || type & IRQ_TYPE_LEVEL_LOW)
224 dev->int_lvl_low[bank] |= bit;
225
226 dev->int_input_en[bank] |= bit;
227
228 return 0;
229}
230
231static struct irq_chip adp5588_irq_chip = {
232 .name = "adp5588",
233 .irq_mask = adp5588_irq_mask,
234 .irq_unmask = adp5588_irq_unmask,
235 .irq_bus_lock = adp5588_irq_bus_lock,
236 .irq_bus_sync_unlock = adp5588_irq_bus_sync_unlock,
237 .irq_set_type = adp5588_irq_set_type,
238};
239
240static irqreturn_t adp5588_irq_handler(int irq, void *devid)
241{
242 struct adp5588_gpio *dev = devid;
243 int status = adp5588_gpio_read(dev->client, INT_STAT);
244
245 if (status & ADP5588_KE_INT) {
246 int ev_cnt = adp5588_gpio_read(dev->client, KEY_LCK_EC_STAT);
247
248 if (ev_cnt > 0) {
249 int i;
250
251 for (i = 0; i < (ev_cnt & ADP5588_KEC); i++) {
252 int key = adp5588_gpio_read(dev->client,
253 Key_EVENTA + i);
254 /* GPIN events begin at 97,
255 * bit 7 indicates logic level
256 */
257 int gpio = (key & 0x7f) - 97;
258 int lvl = key & (1 << 7);
259 int bank = ADP5588_BANK(gpio);
260 int bit = ADP5588_BIT(gpio);
261
262 if ((lvl && dev->int_lvl_high[bank] & bit) ||
263 (!lvl && dev->int_lvl_low[bank] & bit))
264 handle_nested_irq(irq_find_mapping(
265 dev->gpio_chip.irq.domain, gpio));
266 }
267 }
268 }
269
270 adp5588_gpio_write(dev->client, INT_STAT, status); /* Status is W1C */
271
272 return IRQ_HANDLED;
273}
274
275static int adp5588_irq_setup(struct adp5588_gpio *dev)
276{
277 struct i2c_client *client = dev->client;
278 int ret;
279 struct adp5588_gpio_platform_data *pdata =
280 dev_get_platdata(&client->dev);
281 int irq_base = pdata ? pdata->irq_base : 0;
282
283 adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC);
284 adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */
285
286 mutex_init(&dev->irq_lock);
287
288 ret = devm_request_threaded_irq(&client->dev, client->irq,
289 NULL, adp5588_irq_handler, IRQF_ONESHOT
290 | IRQF_TRIGGER_FALLING | IRQF_SHARED,
291 dev_name(&client->dev), dev);
292 if (ret) {
293 dev_err(&client->dev, "failed to request irq %d\n",
294 client->irq);
295 return ret;
296 }
297 ret = gpiochip_irqchip_add_nested(&dev->gpio_chip,
298 &adp5588_irq_chip, irq_base,
299 handle_simple_irq,
300 IRQ_TYPE_NONE);
301 if (ret) {
302 dev_err(&client->dev,
303 "could not connect irqchip to gpiochip\n");
304 return ret;
305 }
306 gpiochip_set_nested_irqchip(&dev->gpio_chip,
307 &adp5588_irq_chip,
308 client->irq);
309
310 adp5588_gpio_write(client, CFG,
311 ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_KE_IEN);
312
313 return 0;
314}
315
316#else
317static int adp5588_irq_setup(struct adp5588_gpio *dev)
318{
319 struct i2c_client *client = dev->client;
320 dev_warn(&client->dev, "interrupt support not compiled in\n");
321
322 return 0;
323}
324
325#endif /* CONFIG_GPIO_ADP5588_IRQ */
326
327static int adp5588_gpio_probe(struct i2c_client *client)
328{
329 struct adp5588_gpio_platform_data *pdata =
330 dev_get_platdata(&client->dev);
331 struct adp5588_gpio *dev;
332 struct gpio_chip *gc;
333 int ret, i, revid;
334 unsigned int pullup_dis_mask = 0;
335
336 if (!i2c_check_functionality(client->adapter,
337 I2C_FUNC_SMBUS_BYTE_DATA)) {
338 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
339 return -EIO;
340 }
341
342 dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
343 if (!dev)
344 return -ENOMEM;
345
346 dev->client = client;
347
348 gc = &dev->gpio_chip;
349 gc->direction_input = adp5588_gpio_direction_input;
350 gc->direction_output = adp5588_gpio_direction_output;
351 gc->get = adp5588_gpio_get_value;
352 gc->set = adp5588_gpio_set_value;
353 gc->can_sleep = true;
354 gc->base = -1;
355 gc->parent = &client->dev;
356
357 if (pdata) {
358 gc->base = pdata->gpio_start;
359 gc->names = pdata->names;
360 pullup_dis_mask = pdata->pullup_dis_mask;
361 }
362
363 gc->ngpio = ADP5588_MAXGPIO;
364 gc->label = client->name;
365 gc->owner = THIS_MODULE;
366
367 mutex_init(&dev->lock);
368
369 ret = adp5588_gpio_read(dev->client, DEV_ID);
370 if (ret < 0)
371 return ret;
372
373 revid = ret & ADP5588_DEVICE_ID_MASK;
374
375 for (i = 0, ret = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
376 dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
377 dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
378 ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
379 ret |= adp5588_gpio_write(client, GPIO_PULL1 + i,
380 (pullup_dis_mask >> (8 * i)) & 0xFF);
381 ret |= adp5588_gpio_write(client, GPIO_INT_EN1 + i, 0);
382 if (ret)
383 return ret;
384 }
385
386 if (client->irq) {
387 if (WA_DELAYED_READOUT_REVID(revid)) {
388 dev_warn(&client->dev, "GPIO int not supported\n");
389 } else {
390 ret = adp5588_irq_setup(dev);
391 if (ret)
392 return ret;
393 }
394 }
395
396 ret = devm_gpiochip_add_data(&client->dev, &dev->gpio_chip, dev);
397 if (ret)
398 return ret;
399
400 if (pdata && pdata->setup) {
401 ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
402 if (ret < 0)
403 dev_warn(&client->dev, "setup failed, %d\n", ret);
404 }
405
406 i2c_set_clientdata(client, dev);
407
408 return 0;
409}
410
411static int adp5588_gpio_remove(struct i2c_client *client)
412{
413 struct adp5588_gpio_platform_data *pdata =
414 dev_get_platdata(&client->dev);
415 struct adp5588_gpio *dev = i2c_get_clientdata(client);
416 int ret;
417
418 if (pdata && pdata->teardown) {
419 ret = pdata->teardown(client,
420 dev->gpio_chip.base, dev->gpio_chip.ngpio,
421 pdata->context);
422 if (ret < 0) {
423 dev_err(&client->dev, "teardown failed %d\n", ret);
424 return ret;
425 }
426 }
427
428 if (dev->client->irq)
429 free_irq(dev->client->irq, dev);
430
431 return 0;
432}
433
434static const struct i2c_device_id adp5588_gpio_id[] = {
435 {DRV_NAME, 0},
436 {}
437};
438MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);
439
440#ifdef CONFIG_OF
441static const struct of_device_id adp5588_gpio_of_id[] = {
442 { .compatible = "adi," DRV_NAME, },
443 {},
444};
445MODULE_DEVICE_TABLE(of, adp5588_gpio_of_id);
446#endif
447
448static struct i2c_driver adp5588_gpio_driver = {
449 .driver = {
450 .name = DRV_NAME,
451 .of_match_table = of_match_ptr(adp5588_gpio_of_id),
452 },
453 .probe_new = adp5588_gpio_probe,
454 .remove = adp5588_gpio_remove,
455 .id_table = adp5588_gpio_id,
456};
457
458module_i2c_driver(adp5588_gpio_driver);
459
460MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
461MODULE_DESCRIPTION("GPIO ADP5588 Driver");
462MODULE_LICENSE("GPL");