1 // SPDX-License-Identifier: GPL-2.0-only
3 * MFD core driver for Ricoh RN5T618 PMIC
5 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
6 * Copyright (C) 2016 Toradex AG
9 #include <linux/delay.h>
10 #include <linux/i2c.h>
11 #include <linux/interrupt.h>
12 #include <linux/irq.h>
13 #include <linux/mfd/core.h>
14 #include <linux/mfd/rn5t618.h>
15 #include <linux/module.h>
16 #include <linux/of_device.h>
17 #include <linux/platform_device.h>
18 #include <linux/reboot.h>
19 #include <linux/regmap.h>
21 static const struct mfd_cell rn5t618_cells
[] = {
22 { .name
= "rn5t618-regulator" },
23 { .name
= "rn5t618-wdt" },
26 static const struct mfd_cell rc5t619_cells
[] = {
27 { .name
= "rn5t618-adc" },
28 { .name
= "rn5t618-power" },
29 { .name
= "rn5t618-regulator" },
30 { .name
= "rc5t619-rtc" },
31 { .name
= "rn5t618-wdt" },
34 static bool rn5t618_volatile_reg(struct device
*dev
, unsigned int reg
)
37 case RN5T618_WATCHDOGCNT
:
39 case RN5T618_ILIMDATAH
... RN5T618_AIN0DATAL
:
41 case RN5T618_IR_ADC1
... RN5T618_IR_ADC3
:
44 case RN5T618_MON_IOIN
:
46 case RN5T618_RTC_CTRL1
... RN5T618_RTC_CTRL2
:
47 case RN5T618_RTC_SECONDS
... RN5T618_RTC_YEAR
:
48 case RN5T618_CHGSTATE
:
49 case RN5T618_CHGCTRL_IRR
... RN5T618_CHGERR_MONI
:
50 case RN5T618_CONTROL
... RN5T618_CC_AVEREG0
:
57 static const struct regmap_config rn5t618_regmap_config
= {
60 .volatile_reg
= rn5t618_volatile_reg
,
61 .max_register
= RN5T618_MAX_REG
,
62 .cache_type
= REGCACHE_RBTREE
,
65 static const struct regmap_irq rc5t619_irqs
[] = {
66 REGMAP_IRQ_REG(RN5T618_IRQ_SYS
, 0, BIT(0)),
67 REGMAP_IRQ_REG(RN5T618_IRQ_DCDC
, 0, BIT(1)),
68 REGMAP_IRQ_REG(RN5T618_IRQ_RTC
, 0, BIT(2)),
69 REGMAP_IRQ_REG(RN5T618_IRQ_ADC
, 0, BIT(3)),
70 REGMAP_IRQ_REG(RN5T618_IRQ_GPIO
, 0, BIT(4)),
71 REGMAP_IRQ_REG(RN5T618_IRQ_CHG
, 0, BIT(6)),
74 static const struct regmap_irq_chip rc5t619_irq_chip
= {
77 .num_irqs
= ARRAY_SIZE(rc5t619_irqs
),
79 .status_base
= RN5T618_INTMON
,
80 .mask_base
= RN5T618_INTEN
,
84 static struct i2c_client
*rn5t618_pm_power_off
;
85 static struct notifier_block rn5t618_restart_handler
;
87 static int rn5t618_irq_init(struct rn5t618
*rn5t618
)
89 const struct regmap_irq_chip
*irq_chip
= NULL
;
95 switch (rn5t618
->variant
) {
97 irq_chip
= &rc5t619_irq_chip
;
100 dev_err(rn5t618
->dev
, "Currently no IRQ support for variant %d\n",
101 (int)rn5t618
->variant
);
105 ret
= devm_regmap_add_irq_chip(rn5t618
->dev
, rn5t618
->regmap
,
107 IRQF_TRIGGER_FALLING
| IRQF_ONESHOT
,
108 0, irq_chip
, &rn5t618
->irq_data
);
110 dev_err(rn5t618
->dev
, "Failed to register IRQ chip\n");
115 static void rn5t618_trigger_poweroff_sequence(bool repower
)
119 /* disable automatic repower-on */
120 ret
= i2c_smbus_read_byte_data(rn5t618_pm_power_off
, RN5T618_REPCNT
);
124 ret
&= ~RN5T618_REPCNT_REPWRON
;
126 ret
|= RN5T618_REPCNT_REPWRON
;
128 ret
= i2c_smbus_write_byte_data(rn5t618_pm_power_off
,
129 RN5T618_REPCNT
, (u8
)ret
);
133 /* start power-off sequence */
134 ret
= i2c_smbus_read_byte_data(rn5t618_pm_power_off
, RN5T618_SLPCNT
);
138 ret
|= RN5T618_SLPCNT_SWPWROFF
;
140 ret
= i2c_smbus_write_byte_data(rn5t618_pm_power_off
,
141 RN5T618_SLPCNT
, (u8
)ret
);
148 dev_alert(&rn5t618_pm_power_off
->dev
, "Failed to shutdown (err = %d)\n", ret
);
151 static void rn5t618_power_off(void)
153 rn5t618_trigger_poweroff_sequence(false);
156 static int rn5t618_restart(struct notifier_block
*this,
157 unsigned long mode
, void *cmd
)
159 rn5t618_trigger_poweroff_sequence(true);
162 * Re-power factor detection on PMIC side is not instant. 1ms
163 * proved to be enough time until reset takes effect.
170 static const struct of_device_id rn5t618_of_match
[] = {
171 { .compatible
= "ricoh,rn5t567", .data
= (void *)RN5T567
},
172 { .compatible
= "ricoh,rn5t618", .data
= (void *)RN5T618
},
173 { .compatible
= "ricoh,rc5t619", .data
= (void *)RC5T619
},
176 MODULE_DEVICE_TABLE(of
, rn5t618_of_match
);
178 static int rn5t618_i2c_probe(struct i2c_client
*i2c
)
180 const struct of_device_id
*of_id
;
181 struct rn5t618
*priv
;
184 of_id
= of_match_device(rn5t618_of_match
, &i2c
->dev
);
186 dev_err(&i2c
->dev
, "Failed to find matching DT ID\n");
190 priv
= devm_kzalloc(&i2c
->dev
, sizeof(*priv
), GFP_KERNEL
);
194 i2c_set_clientdata(i2c
, priv
);
195 priv
->variant
= (long)of_id
->data
;
196 priv
->irq
= i2c
->irq
;
197 priv
->dev
= &i2c
->dev
;
199 priv
->regmap
= devm_regmap_init_i2c(i2c
, &rn5t618_regmap_config
);
200 if (IS_ERR(priv
->regmap
)) {
201 ret
= PTR_ERR(priv
->regmap
);
202 dev_err(&i2c
->dev
, "regmap init failed: %d\n", ret
);
206 if (priv
->variant
== RC5T619
)
207 ret
= devm_mfd_add_devices(&i2c
->dev
, PLATFORM_DEVID_NONE
,
209 ARRAY_SIZE(rc5t619_cells
),
212 ret
= devm_mfd_add_devices(&i2c
->dev
, PLATFORM_DEVID_NONE
,
214 ARRAY_SIZE(rn5t618_cells
),
217 dev_err(&i2c
->dev
, "failed to add sub-devices: %d\n", ret
);
221 rn5t618_pm_power_off
= i2c
;
222 if (of_device_is_system_power_controller(i2c
->dev
.of_node
)) {
224 pm_power_off
= rn5t618_power_off
;
226 dev_warn(&i2c
->dev
, "Poweroff callback already assigned\n");
229 rn5t618_restart_handler
.notifier_call
= rn5t618_restart
;
230 rn5t618_restart_handler
.priority
= 192;
232 ret
= register_restart_handler(&rn5t618_restart_handler
);
234 dev_err(&i2c
->dev
, "cannot register restart handler, %d\n", ret
);
238 return rn5t618_irq_init(priv
);
241 static int rn5t618_i2c_remove(struct i2c_client
*i2c
)
243 if (i2c
== rn5t618_pm_power_off
) {
244 rn5t618_pm_power_off
= NULL
;
248 unregister_restart_handler(&rn5t618_restart_handler
);
253 static int __maybe_unused
rn5t618_i2c_suspend(struct device
*dev
)
255 struct rn5t618
*priv
= dev_get_drvdata(dev
);
258 disable_irq(priv
->irq
);
263 static int __maybe_unused
rn5t618_i2c_resume(struct device
*dev
)
265 struct rn5t618
*priv
= dev_get_drvdata(dev
);
268 enable_irq(priv
->irq
);
273 static SIMPLE_DEV_PM_OPS(rn5t618_i2c_dev_pm_ops
,
277 static struct i2c_driver rn5t618_i2c_driver
= {
280 .of_match_table
= of_match_ptr(rn5t618_of_match
),
281 .pm
= &rn5t618_i2c_dev_pm_ops
,
283 .probe_new
= rn5t618_i2c_probe
,
284 .remove
= rn5t618_i2c_remove
,
287 module_i2c_driver(rn5t618_i2c_driver
);
289 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
290 MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver");
291 MODULE_LICENSE("GPL v2");