xref: /openbmc/linux/drivers/mfd/as3722.c (revision 2455f0e1) 
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 
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 
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 
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 
336 static int as3722_i2c_probe(struct i2c_client *i2c)
337 {
338 	struct as3722 *as3722;
339 	unsigned long irq_flags;
340 	int ret;
341 	u8 val = 0;
342 
343 	as3722 = devm_kzalloc(&i2c->dev, sizeof(struct as3722), GFP_KERNEL);
344 	if (!as3722)
345 		return -ENOMEM;
346 
347 	as3722->dev = &i2c->dev;
348 	as3722->chip_irq = i2c->irq;
349 	i2c_set_clientdata(i2c, as3722);
350 
351 	ret = as3722_i2c_of_probe(i2c, as3722);
352 	if (ret < 0)
353 		return ret;
354 
355 	as3722->regmap = devm_regmap_init_i2c(i2c, &as3722_regmap_config);
356 	if (IS_ERR(as3722->regmap)) {
357 		ret = PTR_ERR(as3722->regmap);
358 		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
359 		return ret;
360 	}
361 
362 	ret = as3722_check_device_id(as3722);
363 	if (ret < 0)
364 		return ret;
365 
366 	irq_flags = as3722->irq_flags | IRQF_ONESHOT;
367 	ret = devm_regmap_add_irq_chip(as3722->dev, as3722->regmap,
368 				       as3722->chip_irq,
369 				       irq_flags, -1, &as3722_irq_chip,
370 				       &as3722->irq_data);
371 	if (ret < 0) {
372 		dev_err(as3722->dev, "Failed to add regmap irq: %d\n", ret);
373 		return ret;
374 	}
375 
376 	ret = as3722_configure_pullups(as3722);
377 	if (ret < 0)
378 		return ret;
379 
380 	if (as3722->en_ac_ok_pwr_on)
381 		val = AS3722_CTRL_SEQU1_AC_OK_PWR_ON;
382 	ret = as3722_update_bits(as3722, AS3722_CTRL_SEQU1_REG,
383 			AS3722_CTRL_SEQU1_AC_OK_PWR_ON, val);
384 	if (ret < 0) {
385 		dev_err(as3722->dev, "CTRLsequ1 update failed: %d\n", ret);
386 		return ret;
387 	}
388 
389 	ret = devm_mfd_add_devices(&i2c->dev, -1, as3722_devs,
390 				   ARRAY_SIZE(as3722_devs), NULL, 0,
391 				   regmap_irq_get_domain(as3722->irq_data));
392 	if (ret) {
393 		dev_err(as3722->dev, "Failed to add MFD devices: %d\n", ret);
394 		return ret;
395 	}
396 
397 	device_init_wakeup(as3722->dev, true);
398 
399 	dev_dbg(as3722->dev, "AS3722 core driver initialized successfully\n");
400 	return 0;
401 }
402 
403 static int __maybe_unused as3722_i2c_suspend(struct device *dev)
404 {
405 	struct as3722 *as3722 = dev_get_drvdata(dev);
406 
407 	if (device_may_wakeup(dev))
408 		enable_irq_wake(as3722->chip_irq);
409 	disable_irq(as3722->chip_irq);
410 
411 	return 0;
412 }
413 
414 static int __maybe_unused as3722_i2c_resume(struct device *dev)
415 {
416 	struct as3722 *as3722 = dev_get_drvdata(dev);
417 
418 	enable_irq(as3722->chip_irq);
419 
420 	if (device_may_wakeup(dev))
421 		disable_irq_wake(as3722->chip_irq);
422 
423 	return 0;
424 }
425 
426 static const struct of_device_id as3722_of_match[] = {
427 	{ .compatible = "ams,as3722", },
428 	{},
429 };
430 MODULE_DEVICE_TABLE(of, as3722_of_match);
431 
432 static const struct i2c_device_id as3722_i2c_id[] = {
433 	{ "as3722", 0 },
434 	{},
435 };
436 MODULE_DEVICE_TABLE(i2c, as3722_i2c_id);
437 
438 static const struct dev_pm_ops as3722_pm_ops = {
439 	SET_SYSTEM_SLEEP_PM_OPS(as3722_i2c_suspend, as3722_i2c_resume)
440 };
441 
442 static struct i2c_driver as3722_i2c_driver = {
443 	.driver = {
444 		.name = "as3722",
445 		.of_match_table = as3722_of_match,
446 		.pm = &as3722_pm_ops,
447 	},
448 	.probe_new = as3722_i2c_probe,
449 	.id_table = as3722_i2c_id,
450 };
451 
452 module_i2c_driver(as3722_i2c_driver);
453 
454 MODULE_DESCRIPTION("I2C support for AS3722 PMICs");
455 MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
456 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
457 MODULE_LICENSE("GPL");
458