xref: /openbmc/linux/drivers/mfd/as3722.c (revision 8e8e69d6) 
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 	{
28 		.name = "as3722-rtc-alarm",
29 		.start = AS3722_IRQ_RTC_ALARM,
30 		.end = AS3722_IRQ_RTC_ALARM,
31 		.flags = IORESOURCE_IRQ,
32 	},
33 };
34 
35 static const struct resource as3722_adc_resource[] = {
36 	{
37 		.name = "as3722-adc",
38 		.start = AS3722_IRQ_ADC,
39 		.end = AS3722_IRQ_ADC,
40 		.flags = IORESOURCE_IRQ,
41 	},
42 };
43 
44 static const struct mfd_cell as3722_devs[] = {
45 	{
46 		.name = "as3722-pinctrl",
47 	},
48 	{
49 		.name = "as3722-regulator",
50 	},
51 	{
52 		.name = "as3722-rtc",
53 		.num_resources = ARRAY_SIZE(as3722_rtc_resource),
54 		.resources = as3722_rtc_resource,
55 	},
56 	{
57 		.name = "as3722-adc",
58 		.num_resources = ARRAY_SIZE(as3722_adc_resource),
59 		.resources = as3722_adc_resource,
60 	},
61 	{
62 		.name = "as3722-power-off",
63 	},
64 	{
65 		.name = "as3722-wdt",
66 	},
67 };
68 
69 static const struct regmap_irq as3722_irqs[] = {
70 	/* INT1 IRQs */
71 	[AS3722_IRQ_LID] = {
72 		.mask = AS3722_INTERRUPT_MASK1_LID,
73 	},
74 	[AS3722_IRQ_ACOK] = {
75 		.mask = AS3722_INTERRUPT_MASK1_ACOK,
76 	},
77 	[AS3722_IRQ_ENABLE1] = {
78 		.mask = AS3722_INTERRUPT_MASK1_ENABLE1,
79 	},
80 	[AS3722_IRQ_OCCUR_ALARM_SD0] = {
81 		.mask = AS3722_INTERRUPT_MASK1_OCURR_ALARM_SD0,
82 	},
83 	[AS3722_IRQ_ONKEY_LONG_PRESS] = {
84 		.mask = AS3722_INTERRUPT_MASK1_ONKEY_LONG,
85 	},
86 	[AS3722_IRQ_ONKEY] = {
87 		.mask = AS3722_INTERRUPT_MASK1_ONKEY,
88 	},
89 	[AS3722_IRQ_OVTMP] = {
90 		.mask = AS3722_INTERRUPT_MASK1_OVTMP,
91 	},
92 	[AS3722_IRQ_LOWBAT] = {
93 		.mask = AS3722_INTERRUPT_MASK1_LOWBAT,
94 	},
95 
96 	/* INT2 IRQs */
97 	[AS3722_IRQ_SD0_LV] = {
98 		.mask = AS3722_INTERRUPT_MASK2_SD0_LV,
99 		.reg_offset = 1,
100 	},
101 	[AS3722_IRQ_SD1_LV] = {
102 		.mask = AS3722_INTERRUPT_MASK2_SD1_LV,
103 		.reg_offset = 1,
104 	},
105 	[AS3722_IRQ_SD2_LV] = {
106 		.mask = AS3722_INTERRUPT_MASK2_SD2345_LV,
107 		.reg_offset = 1,
108 	},
109 	[AS3722_IRQ_PWM1_OV_PROT] = {
110 		.mask = AS3722_INTERRUPT_MASK2_PWM1_OV_PROT,
111 		.reg_offset = 1,
112 	},
113 	[AS3722_IRQ_PWM2_OV_PROT] = {
114 		.mask = AS3722_INTERRUPT_MASK2_PWM2_OV_PROT,
115 		.reg_offset = 1,
116 	},
117 	[AS3722_IRQ_ENABLE2] = {
118 		.mask = AS3722_INTERRUPT_MASK2_ENABLE2,
119 		.reg_offset = 1,
120 	},
121 	[AS3722_IRQ_SD6_LV] = {
122 		.mask = AS3722_INTERRUPT_MASK2_SD6_LV,
123 		.reg_offset = 1,
124 	},
125 	[AS3722_IRQ_RTC_REP] = {
126 		.mask = AS3722_INTERRUPT_MASK2_RTC_REP,
127 		.reg_offset = 1,
128 	},
129 
130 	/* INT3 IRQs */
131 	[AS3722_IRQ_RTC_ALARM] = {
132 		.mask = AS3722_INTERRUPT_MASK3_RTC_ALARM,
133 		.reg_offset = 2,
134 	},
135 	[AS3722_IRQ_GPIO1] = {
136 		.mask = AS3722_INTERRUPT_MASK3_GPIO1,
137 		.reg_offset = 2,
138 	},
139 	[AS3722_IRQ_GPIO2] = {
140 		.mask = AS3722_INTERRUPT_MASK3_GPIO2,
141 		.reg_offset = 2,
142 	},
143 	[AS3722_IRQ_GPIO3] = {
144 		.mask = AS3722_INTERRUPT_MASK3_GPIO3,
145 		.reg_offset = 2,
146 	},
147 	[AS3722_IRQ_GPIO4] = {
148 		.mask = AS3722_INTERRUPT_MASK3_GPIO4,
149 		.reg_offset = 2,
150 	},
151 	[AS3722_IRQ_GPIO5] = {
152 		.mask = AS3722_INTERRUPT_MASK3_GPIO5,
153 		.reg_offset = 2,
154 	},
155 	[AS3722_IRQ_WATCHDOG] = {
156 		.mask = AS3722_INTERRUPT_MASK3_WATCHDOG,
157 		.reg_offset = 2,
158 	},
159 	[AS3722_IRQ_ENABLE3] = {
160 		.mask = AS3722_INTERRUPT_MASK3_ENABLE3,
161 		.reg_offset = 2,
162 	},
163 
164 	/* INT4 IRQs */
165 	[AS3722_IRQ_TEMP_SD0_SHUTDOWN] = {
166 		.mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_SHUTDOWN,
167 		.reg_offset = 3,
168 	},
169 	[AS3722_IRQ_TEMP_SD1_SHUTDOWN] = {
170 		.mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_SHUTDOWN,
171 		.reg_offset = 3,
172 	},
173 	[AS3722_IRQ_TEMP_SD2_SHUTDOWN] = {
174 		.mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_SHUTDOWN,
175 		.reg_offset = 3,
176 	},
177 	[AS3722_IRQ_TEMP_SD0_ALARM] = {
178 		.mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_ALARM,
179 		.reg_offset = 3,
180 	},
181 	[AS3722_IRQ_TEMP_SD1_ALARM] = {
182 		.mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_ALARM,
183 		.reg_offset = 3,
184 	},
185 	[AS3722_IRQ_TEMP_SD6_ALARM] = {
186 		.mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_ALARM,
187 		.reg_offset = 3,
188 	},
189 	[AS3722_IRQ_OCCUR_ALARM_SD6] = {
190 		.mask = AS3722_INTERRUPT_MASK4_OCCUR_ALARM_SD6,
191 		.reg_offset = 3,
192 	},
193 	[AS3722_IRQ_ADC] = {
194 		.mask = AS3722_INTERRUPT_MASK4_ADC,
195 		.reg_offset = 3,
196 	},
197 };
198 
199 static const struct regmap_irq_chip as3722_irq_chip = {
200 	.name = "as3722",
201 	.irqs = as3722_irqs,
202 	.num_irqs = ARRAY_SIZE(as3722_irqs),
203 	.num_regs = 4,
204 	.status_base = AS3722_INTERRUPT_STATUS1_REG,
205 	.mask_base = AS3722_INTERRUPT_MASK1_REG,
206 };
207 
208 static int as3722_check_device_id(struct as3722 *as3722)
209 {
210 	u32 val;
211 	int ret;
212 
213 	/* Check that this is actually a AS3722 */
214 	ret = as3722_read(as3722, AS3722_ASIC_ID1_REG, &val);
215 	if (ret < 0) {
216 		dev_err(as3722->dev, "ASIC_ID1 read failed: %d\n", ret);
217 		return ret;
218 	}
219 
220 	if (val != AS3722_DEVICE_ID) {
221 		dev_err(as3722->dev, "Device is not AS3722, ID is 0x%x\n", val);
222 		return -ENODEV;
223 	}
224 
225 	ret = as3722_read(as3722, AS3722_ASIC_ID2_REG, &val);
226 	if (ret < 0) {
227 		dev_err(as3722->dev, "ASIC_ID2 read failed: %d\n", ret);
228 		return ret;
229 	}
230 
231 	dev_info(as3722->dev, "AS3722 with revision 0x%x found\n", val);
232 	return 0;
233 }
234 
235 static int as3722_configure_pullups(struct as3722 *as3722)
236 {
237 	int ret;
238 	u32 val = 0;
239 
240 	if (as3722->en_intern_int_pullup)
241 		val |= AS3722_INT_PULL_UP;
242 	if (as3722->en_intern_i2c_pullup)
243 		val |= AS3722_I2C_PULL_UP;
244 
245 	ret = as3722_update_bits(as3722, AS3722_IOVOLTAGE_REG,
246 			AS3722_INT_PULL_UP | AS3722_I2C_PULL_UP, val);
247 	if (ret < 0)
248 		dev_err(as3722->dev, "IOVOLTAGE_REG update failed: %d\n", ret);
249 	return ret;
250 }
251 
252 static const struct regmap_range as3722_readable_ranges[] = {
253 	regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
254 	regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
255 	regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_REG_SEQU_MOD3_REG),
256 	regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
257 	regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
258 	regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
259 					AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
260 	regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
261 	regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
262 	regmap_reg_range(AS3722_RTC_ACCESS_REG, AS3722_RTC_ACCESS_REG),
263 	regmap_reg_range(AS3722_RTC_STATUS_REG, AS3722_TEMP_STATUS_REG),
264 	regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC_CONFIGURATION_REG),
265 	regmap_reg_range(AS3722_ASIC_ID1_REG, AS3722_ASIC_ID2_REG),
266 	regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
267 	regmap_reg_range(AS3722_FUSE7_REG, AS3722_FUSE7_REG),
268 };
269 
270 static const struct regmap_access_table as3722_readable_table = {
271 	.yes_ranges = as3722_readable_ranges,
272 	.n_yes_ranges = ARRAY_SIZE(as3722_readable_ranges),
273 };
274 
275 static const struct regmap_range as3722_writable_ranges[] = {
276 	regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
277 	regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
278 	regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_GPIO_SIGNAL_OUT_REG),
279 	regmap_reg_range(AS3722_REG_SEQU_MOD1_REG, AS3722_REG_SEQU_MOD3_REG),
280 	regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
281 	regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
282 	regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
283 					AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
284 	regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
285 	regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
286 	regmap_reg_range(AS3722_INTERRUPT_MASK1_REG, AS3722_TEMP_STATUS_REG),
287 	regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC1_CONTROL_REG),
288 	regmap_reg_range(AS3722_ADC1_THRESHOLD_HI_MSB_REG,
289 					AS3722_ADC_CONFIGURATION_REG),
290 	regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
291 };
292 
293 static const struct regmap_access_table as3722_writable_table = {
294 	.yes_ranges = as3722_writable_ranges,
295 	.n_yes_ranges = ARRAY_SIZE(as3722_writable_ranges),
296 };
297 
298 static const struct regmap_range as3722_cacheable_ranges[] = {
299 	regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_LDO11_VOLTAGE_REG),
300 	regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_LDOCONTROL1_REG),
301 };
302 
303 static const struct regmap_access_table as3722_volatile_table = {
304 	.no_ranges = as3722_cacheable_ranges,
305 	.n_no_ranges = ARRAY_SIZE(as3722_cacheable_ranges),
306 };
307 
308 static const struct regmap_config as3722_regmap_config = {
309 	.reg_bits = 8,
310 	.val_bits = 8,
311 	.max_register = AS3722_MAX_REGISTER,
312 	.cache_type = REGCACHE_RBTREE,
313 	.rd_table = &as3722_readable_table,
314 	.wr_table = &as3722_writable_table,
315 	.volatile_table = &as3722_volatile_table,
316 };
317 
318 static int as3722_i2c_of_probe(struct i2c_client *i2c,
319 			struct as3722 *as3722)
320 {
321 	struct device_node *np = i2c->dev.of_node;
322 	struct irq_data *irq_data;
323 
324 	if (!np) {
325 		dev_err(&i2c->dev, "Device Tree not found\n");
326 		return -EINVAL;
327 	}
328 
329 	irq_data = irq_get_irq_data(i2c->irq);
330 	if (!irq_data) {
331 		dev_err(&i2c->dev, "Invalid IRQ: %d\n", i2c->irq);
332 		return -EINVAL;
333 	}
334 
335 	as3722->en_intern_int_pullup = of_property_read_bool(np,
336 					"ams,enable-internal-int-pullup");
337 	as3722->en_intern_i2c_pullup = of_property_read_bool(np,
338 					"ams,enable-internal-i2c-pullup");
339 	as3722->en_ac_ok_pwr_on = of_property_read_bool(np,
340 					"ams,enable-ac-ok-power-on");
341 	as3722->irq_flags = irqd_get_trigger_type(irq_data);
342 	dev_dbg(&i2c->dev, "IRQ flags are 0x%08lx\n", as3722->irq_flags);
343 	return 0;
344 }
345 
346 static int as3722_i2c_probe(struct i2c_client *i2c,
347 			const struct i2c_device_id *id)
348 {
349 	struct as3722 *as3722;
350 	unsigned long irq_flags;
351 	int ret;
352 	u8 val = 0;
353 
354 	as3722 = devm_kzalloc(&i2c->dev, sizeof(struct as3722), GFP_KERNEL);
355 	if (!as3722)
356 		return -ENOMEM;
357 
358 	as3722->dev = &i2c->dev;
359 	as3722->chip_irq = i2c->irq;
360 	i2c_set_clientdata(i2c, as3722);
361 
362 	ret = as3722_i2c_of_probe(i2c, as3722);
363 	if (ret < 0)
364 		return ret;
365 
366 	as3722->regmap = devm_regmap_init_i2c(i2c, &as3722_regmap_config);
367 	if (IS_ERR(as3722->regmap)) {
368 		ret = PTR_ERR(as3722->regmap);
369 		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
370 		return ret;
371 	}
372 
373 	ret = as3722_check_device_id(as3722);
374 	if (ret < 0)
375 		return ret;
376 
377 	irq_flags = as3722->irq_flags | IRQF_ONESHOT;
378 	ret = devm_regmap_add_irq_chip(as3722->dev, as3722->regmap,
379 				       as3722->chip_irq,
380 				       irq_flags, -1, &as3722_irq_chip,
381 				       &as3722->irq_data);
382 	if (ret < 0) {
383 		dev_err(as3722->dev, "Failed to add regmap irq: %d\n", ret);
384 		return ret;
385 	}
386 
387 	ret = as3722_configure_pullups(as3722);
388 	if (ret < 0)
389 		return ret;
390 
391 	if (as3722->en_ac_ok_pwr_on)
392 		val = AS3722_CTRL_SEQU1_AC_OK_PWR_ON;
393 	ret = as3722_update_bits(as3722, AS3722_CTRL_SEQU1_REG,
394 			AS3722_CTRL_SEQU1_AC_OK_PWR_ON, val);
395 	if (ret < 0) {
396 		dev_err(as3722->dev, "CTRLsequ1 update failed: %d\n", ret);
397 		return ret;
398 	}
399 
400 	ret = devm_mfd_add_devices(&i2c->dev, -1, as3722_devs,
401 				   ARRAY_SIZE(as3722_devs), NULL, 0,
402 				   regmap_irq_get_domain(as3722->irq_data));
403 	if (ret) {
404 		dev_err(as3722->dev, "Failed to add MFD devices: %d\n", ret);
405 		return ret;
406 	}
407 
408 	device_init_wakeup(as3722->dev, true);
409 
410 	dev_dbg(as3722->dev, "AS3722 core driver initialized successfully\n");
411 	return 0;
412 }
413 
414 static int __maybe_unused as3722_i2c_suspend(struct device *dev)
415 {
416 	struct as3722 *as3722 = dev_get_drvdata(dev);
417 
418 	if (device_may_wakeup(dev))
419 		enable_irq_wake(as3722->chip_irq);
420 	disable_irq(as3722->chip_irq);
421 
422 	return 0;
423 }
424 
425 static int __maybe_unused as3722_i2c_resume(struct device *dev)
426 {
427 	struct as3722 *as3722 = dev_get_drvdata(dev);
428 
429 	enable_irq(as3722->chip_irq);
430 
431 	if (device_may_wakeup(dev))
432 		disable_irq_wake(as3722->chip_irq);
433 
434 	return 0;
435 }
436 
437 static const struct of_device_id as3722_of_match[] = {
438 	{ .compatible = "ams,as3722", },
439 	{},
440 };
441 MODULE_DEVICE_TABLE(of, as3722_of_match);
442 
443 static const struct i2c_device_id as3722_i2c_id[] = {
444 	{ "as3722", 0 },
445 	{},
446 };
447 MODULE_DEVICE_TABLE(i2c, as3722_i2c_id);
448 
449 static const struct dev_pm_ops as3722_pm_ops = {
450 	SET_SYSTEM_SLEEP_PM_OPS(as3722_i2c_suspend, as3722_i2c_resume)
451 };
452 
453 static struct i2c_driver as3722_i2c_driver = {
454 	.driver = {
455 		.name = "as3722",
456 		.of_match_table = as3722_of_match,
457 		.pm = &as3722_pm_ops,
458 	},
459 	.probe = as3722_i2c_probe,
460 	.id_table = as3722_i2c_id,
461 };
462 
463 module_i2c_driver(as3722_i2c_driver);
464 
465 MODULE_DESCRIPTION("I2C support for AS3722 PMICs");
466 MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
467 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
468 MODULE_LICENSE("GPL");
469