1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Core driver for ams AS3722 PMICs
4 *
5 * Copyright (C) 2013 AMS AG
6 * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
7 *
8 * Author: Florian Lobmaier <florian.lobmaier@ams.com>
9 * Author: Laxman Dewangan <ldewangan@nvidia.com>
10 */
11
12 #include <linux/err.h>
13 #include <linux/i2c.h>
14 #include <linux/interrupt.h>
15 #include <linux/irq.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/mfd/core.h>
19 #include <linux/mfd/as3722.h>
20 #include <linux/of.h>
21 #include <linux/regmap.h>
22 #include <linux/slab.h>
23
24 #define AS3722_DEVICE_ID 0x0C
25
26 static const struct resource as3722_rtc_resource[] = {
27 DEFINE_RES_IRQ_NAMED(AS3722_IRQ_RTC_ALARM, "as3722-rtc-alarm"),
28 };
29
30 static const struct resource as3722_adc_resource[] = {
31 DEFINE_RES_IRQ_NAMED(AS3722_IRQ_ADC, "as3722-adc"),
32 };
33
34 static const struct mfd_cell as3722_devs[] = {
35 {
36 .name = "as3722-pinctrl",
37 },
38 {
39 .name = "as3722-regulator",
40 },
41 {
42 .name = "as3722-rtc",
43 .num_resources = ARRAY_SIZE(as3722_rtc_resource),
44 .resources = as3722_rtc_resource,
45 },
46 {
47 .name = "as3722-adc",
48 .num_resources = ARRAY_SIZE(as3722_adc_resource),
49 .resources = as3722_adc_resource,
50 },
51 {
52 .name = "as3722-power-off",
53 },
54 {
55 .name = "as3722-wdt",
56 },
57 };
58
59 static const struct regmap_irq as3722_irqs[] = {
60 /* INT1 IRQs */
61 [AS3722_IRQ_LID] = {
62 .mask = AS3722_INTERRUPT_MASK1_LID,
63 },
64 [AS3722_IRQ_ACOK] = {
65 .mask = AS3722_INTERRUPT_MASK1_ACOK,
66 },
67 [AS3722_IRQ_ENABLE1] = {
68 .mask = AS3722_INTERRUPT_MASK1_ENABLE1,
69 },
70 [AS3722_IRQ_OCCUR_ALARM_SD0] = {
71 .mask = AS3722_INTERRUPT_MASK1_OCURR_ALARM_SD0,
72 },
73 [AS3722_IRQ_ONKEY_LONG_PRESS] = {
74 .mask = AS3722_INTERRUPT_MASK1_ONKEY_LONG,
75 },
76 [AS3722_IRQ_ONKEY] = {
77 .mask = AS3722_INTERRUPT_MASK1_ONKEY,
78 },
79 [AS3722_IRQ_OVTMP] = {
80 .mask = AS3722_INTERRUPT_MASK1_OVTMP,
81 },
82 [AS3722_IRQ_LOWBAT] = {
83 .mask = AS3722_INTERRUPT_MASK1_LOWBAT,
84 },
85
86 /* INT2 IRQs */
87 [AS3722_IRQ_SD0_LV] = {
88 .mask = AS3722_INTERRUPT_MASK2_SD0_LV,
89 .reg_offset = 1,
90 },
91 [AS3722_IRQ_SD1_LV] = {
92 .mask = AS3722_INTERRUPT_MASK2_SD1_LV,
93 .reg_offset = 1,
94 },
95 [AS3722_IRQ_SD2_LV] = {
96 .mask = AS3722_INTERRUPT_MASK2_SD2345_LV,
97 .reg_offset = 1,
98 },
99 [AS3722_IRQ_PWM1_OV_PROT] = {
100 .mask = AS3722_INTERRUPT_MASK2_PWM1_OV_PROT,
101 .reg_offset = 1,
102 },
103 [AS3722_IRQ_PWM2_OV_PROT] = {
104 .mask = AS3722_INTERRUPT_MASK2_PWM2_OV_PROT,
105 .reg_offset = 1,
106 },
107 [AS3722_IRQ_ENABLE2] = {
108 .mask = AS3722_INTERRUPT_MASK2_ENABLE2,
109 .reg_offset = 1,
110 },
111 [AS3722_IRQ_SD6_LV] = {
112 .mask = AS3722_INTERRUPT_MASK2_SD6_LV,
113 .reg_offset = 1,
114 },
115 [AS3722_IRQ_RTC_REP] = {
116 .mask = AS3722_INTERRUPT_MASK2_RTC_REP,
117 .reg_offset = 1,
118 },
119
120 /* INT3 IRQs */
121 [AS3722_IRQ_RTC_ALARM] = {
122 .mask = AS3722_INTERRUPT_MASK3_RTC_ALARM,
123 .reg_offset = 2,
124 },
125 [AS3722_IRQ_GPIO1] = {
126 .mask = AS3722_INTERRUPT_MASK3_GPIO1,
127 .reg_offset = 2,
128 },
129 [AS3722_IRQ_GPIO2] = {
130 .mask = AS3722_INTERRUPT_MASK3_GPIO2,
131 .reg_offset = 2,
132 },
133 [AS3722_IRQ_GPIO3] = {
134 .mask = AS3722_INTERRUPT_MASK3_GPIO3,
135 .reg_offset = 2,
136 },
137 [AS3722_IRQ_GPIO4] = {
138 .mask = AS3722_INTERRUPT_MASK3_GPIO4,
139 .reg_offset = 2,
140 },
141 [AS3722_IRQ_GPIO5] = {
142 .mask = AS3722_INTERRUPT_MASK3_GPIO5,
143 .reg_offset = 2,
144 },
145 [AS3722_IRQ_WATCHDOG] = {
146 .mask = AS3722_INTERRUPT_MASK3_WATCHDOG,
147 .reg_offset = 2,
148 },
149 [AS3722_IRQ_ENABLE3] = {
150 .mask = AS3722_INTERRUPT_MASK3_ENABLE3,
151 .reg_offset = 2,
152 },
153
154 /* INT4 IRQs */
155 [AS3722_IRQ_TEMP_SD0_SHUTDOWN] = {
156 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_SHUTDOWN,
157 .reg_offset = 3,
158 },
159 [AS3722_IRQ_TEMP_SD1_SHUTDOWN] = {
160 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_SHUTDOWN,
161 .reg_offset = 3,
162 },
163 [AS3722_IRQ_TEMP_SD2_SHUTDOWN] = {
164 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_SHUTDOWN,
165 .reg_offset = 3,
166 },
167 [AS3722_IRQ_TEMP_SD0_ALARM] = {
168 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_ALARM,
169 .reg_offset = 3,
170 },
171 [AS3722_IRQ_TEMP_SD1_ALARM] = {
172 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_ALARM,
173 .reg_offset = 3,
174 },
175 [AS3722_IRQ_TEMP_SD6_ALARM] = {
176 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_ALARM,
177 .reg_offset = 3,
178 },
179 [AS3722_IRQ_OCCUR_ALARM_SD6] = {
180 .mask = AS3722_INTERRUPT_MASK4_OCCUR_ALARM_SD6,
181 .reg_offset = 3,
182 },
183 [AS3722_IRQ_ADC] = {
184 .mask = AS3722_INTERRUPT_MASK4_ADC,
185 .reg_offset = 3,
186 },
187 };
188
189 static const struct regmap_irq_chip as3722_irq_chip = {
190 .name = "as3722",
191 .irqs = as3722_irqs,
192 .num_irqs = ARRAY_SIZE(as3722_irqs),
193 .num_regs = 4,
194 .status_base = AS3722_INTERRUPT_STATUS1_REG,
195 .mask_base = AS3722_INTERRUPT_MASK1_REG,
196 };
197
as3722_check_device_id(struct as3722 * as3722)198 static int as3722_check_device_id(struct as3722 *as3722)
199 {
200 u32 val;
201 int ret;
202
203 /* Check that this is actually a AS3722 */
204 ret = as3722_read(as3722, AS3722_ASIC_ID1_REG, &val);
205 if (ret < 0) {
206 dev_err(as3722->dev, "ASIC_ID1 read failed: %d\n", ret);
207 return ret;
208 }
209
210 if (val != AS3722_DEVICE_ID) {
211 dev_err(as3722->dev, "Device is not AS3722, ID is 0x%x\n", val);
212 return -ENODEV;
213 }
214
215 ret = as3722_read(as3722, AS3722_ASIC_ID2_REG, &val);
216 if (ret < 0) {
217 dev_err(as3722->dev, "ASIC_ID2 read failed: %d\n", ret);
218 return ret;
219 }
220
221 dev_info(as3722->dev, "AS3722 with revision 0x%x found\n", val);
222 return 0;
223 }
224
as3722_configure_pullups(struct as3722 * as3722)225 static int as3722_configure_pullups(struct as3722 *as3722)
226 {
227 int ret;
228 u32 val = 0;
229
230 if (as3722->en_intern_int_pullup)
231 val |= AS3722_INT_PULL_UP;
232 if (as3722->en_intern_i2c_pullup)
233 val |= AS3722_I2C_PULL_UP;
234
235 ret = as3722_update_bits(as3722, AS3722_IOVOLTAGE_REG,
236 AS3722_INT_PULL_UP | AS3722_I2C_PULL_UP, val);
237 if (ret < 0)
238 dev_err(as3722->dev, "IOVOLTAGE_REG update failed: %d\n", ret);
239 return ret;
240 }
241
242 static const struct regmap_range as3722_readable_ranges[] = {
243 regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
244 regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
245 regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_REG_SEQU_MOD3_REG),
246 regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
247 regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
248 regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
249 AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
250 regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
251 regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
252 regmap_reg_range(AS3722_RTC_ACCESS_REG, AS3722_RTC_ACCESS_REG),
253 regmap_reg_range(AS3722_RTC_STATUS_REG, AS3722_TEMP_STATUS_REG),
254 regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC_CONFIGURATION_REG),
255 regmap_reg_range(AS3722_ASIC_ID1_REG, AS3722_ASIC_ID2_REG),
256 regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
257 regmap_reg_range(AS3722_FUSE7_REG, AS3722_FUSE7_REG),
258 };
259
260 static const struct regmap_access_table as3722_readable_table = {
261 .yes_ranges = as3722_readable_ranges,
262 .n_yes_ranges = ARRAY_SIZE(as3722_readable_ranges),
263 };
264
265 static const struct regmap_range as3722_writable_ranges[] = {
266 regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
267 regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
268 regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_GPIO_SIGNAL_OUT_REG),
269 regmap_reg_range(AS3722_REG_SEQU_MOD1_REG, AS3722_REG_SEQU_MOD3_REG),
270 regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
271 regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
272 regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
273 AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
274 regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
275 regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
276 regmap_reg_range(AS3722_INTERRUPT_MASK1_REG, AS3722_TEMP_STATUS_REG),
277 regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC1_CONTROL_REG),
278 regmap_reg_range(AS3722_ADC1_THRESHOLD_HI_MSB_REG,
279 AS3722_ADC_CONFIGURATION_REG),
280 regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
281 };
282
283 static const struct regmap_access_table as3722_writable_table = {
284 .yes_ranges = as3722_writable_ranges,
285 .n_yes_ranges = ARRAY_SIZE(as3722_writable_ranges),
286 };
287
288 static const struct regmap_range as3722_cacheable_ranges[] = {
289 regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_LDO11_VOLTAGE_REG),
290 regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_LDOCONTROL1_REG),
291 };
292
293 static const struct regmap_access_table as3722_volatile_table = {
294 .no_ranges = as3722_cacheable_ranges,
295 .n_no_ranges = ARRAY_SIZE(as3722_cacheable_ranges),
296 };
297
298 static const struct regmap_config as3722_regmap_config = {
299 .reg_bits = 8,
300 .val_bits = 8,
301 .max_register = AS3722_MAX_REGISTER,
302 .cache_type = REGCACHE_RBTREE,
303 .rd_table = &as3722_readable_table,
304 .wr_table = &as3722_writable_table,
305 .volatile_table = &as3722_volatile_table,
306 };
307
as3722_i2c_of_probe(struct i2c_client * i2c,struct as3722 * as3722)308 static int as3722_i2c_of_probe(struct i2c_client *i2c,
309 struct as3722 *as3722)
310 {
311 struct device_node *np = i2c->dev.of_node;
312 struct irq_data *irq_data;
313
314 if (!np) {
315 dev_err(&i2c->dev, "Device Tree not found\n");
316 return -EINVAL;
317 }
318
319 irq_data = irq_get_irq_data(i2c->irq);
320 if (!irq_data) {
321 dev_err(&i2c->dev, "Invalid IRQ: %d\n", i2c->irq);
322 return -EINVAL;
323 }
324
325 as3722->en_intern_int_pullup = of_property_read_bool(np,
326 "ams,enable-internal-int-pullup");
327 as3722->en_intern_i2c_pullup = of_property_read_bool(np,
328 "ams,enable-internal-i2c-pullup");
329 as3722->en_ac_ok_pwr_on = of_property_read_bool(np,
330 "ams,enable-ac-ok-power-on");
331 as3722->irq_flags = irqd_get_trigger_type(irq_data);
332 dev_dbg(&i2c->dev, "IRQ flags are 0x%08lx\n", as3722->irq_flags);
333 return 0;
334 }
335
as3722_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)336 static int as3722_i2c_probe(struct i2c_client *i2c,
337 const struct i2c_device_id *id)
338 {
339 struct as3722 *as3722;
340 unsigned long irq_flags;
341 int ret;
342 u8 val = 0;
343
344 as3722 = devm_kzalloc(&i2c->dev, sizeof(struct as3722), GFP_KERNEL);
345 if (!as3722)
346 return -ENOMEM;
347
348 as3722->dev = &i2c->dev;
349 as3722->chip_irq = i2c->irq;
350 i2c_set_clientdata(i2c, as3722);
351
352 ret = as3722_i2c_of_probe(i2c, as3722);
353 if (ret < 0)
354 return ret;
355
356 as3722->regmap = devm_regmap_init_i2c(i2c, &as3722_regmap_config);
357 if (IS_ERR(as3722->regmap)) {
358 ret = PTR_ERR(as3722->regmap);
359 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
360 return ret;
361 }
362
363 ret = as3722_check_device_id(as3722);
364 if (ret < 0)
365 return ret;
366
367 irq_flags = as3722->irq_flags | IRQF_ONESHOT;
368 ret = devm_regmap_add_irq_chip(as3722->dev, as3722->regmap,
369 as3722->chip_irq,
370 irq_flags, -1, &as3722_irq_chip,
371 &as3722->irq_data);
372 if (ret < 0) {
373 dev_err(as3722->dev, "Failed to add regmap irq: %d\n", ret);
374 return ret;
375 }
376
377 ret = as3722_configure_pullups(as3722);
378 if (ret < 0)
379 return ret;
380
381 if (as3722->en_ac_ok_pwr_on)
382 val = AS3722_CTRL_SEQU1_AC_OK_PWR_ON;
383 ret = as3722_update_bits(as3722, AS3722_CTRL_SEQU1_REG,
384 AS3722_CTRL_SEQU1_AC_OK_PWR_ON, val);
385 if (ret < 0) {
386 dev_err(as3722->dev, "CTRLsequ1 update failed: %d\n", ret);
387 return ret;
388 }
389
390 ret = devm_mfd_add_devices(&i2c->dev, -1, as3722_devs,
391 ARRAY_SIZE(as3722_devs), NULL, 0,
392 regmap_irq_get_domain(as3722->irq_data));
393 if (ret) {
394 dev_err(as3722->dev, "Failed to add MFD devices: %d\n", ret);
395 return ret;
396 }
397
398 device_init_wakeup(as3722->dev, true);
399
400 dev_dbg(as3722->dev, "AS3722 core driver initialized successfully\n");
401 return 0;
402 }
403
as3722_i2c_suspend(struct device * dev)404 static int __maybe_unused as3722_i2c_suspend(struct device *dev)
405 {
406 struct as3722 *as3722 = dev_get_drvdata(dev);
407
408 if (device_may_wakeup(dev))
409 enable_irq_wake(as3722->chip_irq);
410 disable_irq(as3722->chip_irq);
411
412 return 0;
413 }
414
as3722_i2c_resume(struct device * dev)415 static int __maybe_unused as3722_i2c_resume(struct device *dev)
416 {
417 struct as3722 *as3722 = dev_get_drvdata(dev);
418
419 enable_irq(as3722->chip_irq);
420
421 if (device_may_wakeup(dev))
422 disable_irq_wake(as3722->chip_irq);
423
424 return 0;
425 }
426
427 static const struct of_device_id as3722_of_match[] = {
428 { .compatible = "ams,as3722", },
429 {},
430 };
431 MODULE_DEVICE_TABLE(of, as3722_of_match);
432
433 static const struct i2c_device_id as3722_i2c_id[] = {
434 { "as3722", 0 },
435 {},
436 };
437 MODULE_DEVICE_TABLE(i2c, as3722_i2c_id);
438
439 static const struct dev_pm_ops as3722_pm_ops = {
440 SET_SYSTEM_SLEEP_PM_OPS(as3722_i2c_suspend, as3722_i2c_resume)
441 };
442
443 static struct i2c_driver as3722_i2c_driver = {
444 .driver = {
445 .name = "as3722",
446 .of_match_table = as3722_of_match,
447 .pm = &as3722_pm_ops,
448 },
449 .probe = as3722_i2c_probe,
450 .id_table = as3722_i2c_id,
451 };
452
453 module_i2c_driver(as3722_i2c_driver);
454
455 MODULE_DESCRIPTION("I2C support for AS3722 PMICs");
456 MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
457 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
458 MODULE_LICENSE("GPL");
459
