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1// SPDX-License-Identifier: GPL-2.0+
2//
3// max77686.c - mfd core driver for the Maxim 77686/802
4//
5// Copyright (C) 2012 Samsung Electronics
6// Chiwoong Byun <[email protected]>
7// Jonghwa Lee <[email protected]>
8//
9//This driver is based on max8997.c
10
11#include <linux/export.h>
12#include <linux/slab.h>
13#include <linux/i2c.h>
14#include <linux/irq.h>
15#include <linux/interrupt.h>
16#include <linux/pm_runtime.h>
17#include <linux/module.h>
18#include <linux/mfd/core.h>
19#include <linux/mfd/max77686.h>
20#include <linux/mfd/max77686-private.h>
21#include <linux/err.h>
22#include <linux/of.h>
23
24static const struct mfd_cell max77686_devs[] = {
25 { .name = "max77686-pmic", },
26 { .name = "max77686-rtc", },
27 { .name = "max77686-clk", },
28};
29
30static const struct mfd_cell max77802_devs[] = {
31 { .name = "max77802-pmic", },
32 { .name = "max77802-clk", },
33 { .name = "max77802-rtc", },
34};
35
36static bool max77802_pmic_is_accessible_reg(struct device *dev,
37 unsigned int reg)
38{
39 return reg < MAX77802_REG_PMIC_END;
40}
41
42static bool max77802_rtc_is_accessible_reg(struct device *dev,
43 unsigned int reg)
44{
45 return (reg >= MAX77802_RTC_INT && reg < MAX77802_RTC_END);
46}
47
48static bool max77802_is_accessible_reg(struct device *dev, unsigned int reg)
49{
50 return (max77802_pmic_is_accessible_reg(dev, reg) ||
51 max77802_rtc_is_accessible_reg(dev, reg));
52}
53
54static bool max77802_pmic_is_precious_reg(struct device *dev, unsigned int reg)
55{
56 return (reg == MAX77802_REG_INTSRC || reg == MAX77802_REG_INT1 ||
57 reg == MAX77802_REG_INT2);
58}
59
60static bool max77802_rtc_is_precious_reg(struct device *dev, unsigned int reg)
61{
62 return (reg == MAX77802_RTC_INT ||
63 reg == MAX77802_RTC_UPDATE0 ||
64 reg == MAX77802_RTC_UPDATE1);
65}
66
67static bool max77802_is_precious_reg(struct device *dev, unsigned int reg)
68{
69 return (max77802_pmic_is_precious_reg(dev, reg) ||
70 max77802_rtc_is_precious_reg(dev, reg));
71}
72
73static bool max77802_pmic_is_volatile_reg(struct device *dev, unsigned int reg)
74{
75 return (max77802_is_precious_reg(dev, reg) ||
76 reg == MAX77802_REG_STATUS1 || reg == MAX77802_REG_STATUS2 ||
77 reg == MAX77802_REG_PWRON);
78}
79
80static bool max77802_rtc_is_volatile_reg(struct device *dev, unsigned int reg)
81{
82 return (max77802_rtc_is_precious_reg(dev, reg) ||
83 reg == MAX77802_RTC_SEC ||
84 reg == MAX77802_RTC_MIN ||
85 reg == MAX77802_RTC_HOUR ||
86 reg == MAX77802_RTC_WEEKDAY ||
87 reg == MAX77802_RTC_MONTH ||
88 reg == MAX77802_RTC_YEAR ||
89 reg == MAX77802_RTC_MONTHDAY);
90}
91
92static bool max77802_is_volatile_reg(struct device *dev, unsigned int reg)
93{
94 return (max77802_pmic_is_volatile_reg(dev, reg) ||
95 max77802_rtc_is_volatile_reg(dev, reg));
96}
97
98static const struct regmap_config max77686_regmap_config = {
99 .reg_bits = 8,
100 .val_bits = 8,
101};
102
103static const struct regmap_config max77802_regmap_config = {
104 .reg_bits = 8,
105 .val_bits = 8,
106 .writeable_reg = max77802_is_accessible_reg,
107 .readable_reg = max77802_is_accessible_reg,
108 .precious_reg = max77802_is_precious_reg,
109 .volatile_reg = max77802_is_volatile_reg,
110 .name = "max77802-pmic",
111 .cache_type = REGCACHE_MAPLE,
112};
113
114static const struct regmap_irq max77686_irqs[] = {
115 /* INT1 interrupts */
116 { .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, },
117 { .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, },
118 { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, },
119 { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, },
120 { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, },
121 { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, },
122 { .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, },
123 { .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, },
124 /* INT2 interrupts */
125 { .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, },
126 { .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, },
127};
128
129static const struct regmap_irq_chip max77686_irq_chip = {
130 .name = "max77686-pmic",
131 .status_base = MAX77686_REG_INT1,
132 .mask_base = MAX77686_REG_INT1MSK,
133 .num_regs = 2,
134 .irqs = max77686_irqs,
135 .num_irqs = ARRAY_SIZE(max77686_irqs),
136};
137
138static const struct regmap_irq_chip max77802_irq_chip = {
139 .name = "max77802-pmic",
140 .status_base = MAX77802_REG_INT1,
141 .mask_base = MAX77802_REG_INT1MSK,
142 .num_regs = 2,
143 .irqs = max77686_irqs, /* same masks as 77686 */
144 .num_irqs = ARRAY_SIZE(max77686_irqs),
145};
146
147static const struct of_device_id max77686_pmic_dt_match[] = {
148 {
149 .compatible = "maxim,max77686",
150 .data = (void *)TYPE_MAX77686,
151 },
152 {
153 .compatible = "maxim,max77802",
154 .data = (void *)TYPE_MAX77802,
155 },
156 { },
157};
158MODULE_DEVICE_TABLE(of, max77686_pmic_dt_match);
159
160static int max77686_i2c_probe(struct i2c_client *i2c)
161{
162 struct max77686_dev *max77686 = NULL;
163 unsigned int data;
164 int ret = 0;
165 const struct regmap_config *config;
166 const struct regmap_irq_chip *irq_chip;
167 const struct mfd_cell *cells;
168 int n_devs;
169
170 max77686 = devm_kzalloc(&i2c->dev,
171 sizeof(struct max77686_dev), GFP_KERNEL);
172 if (!max77686)
173 return -ENOMEM;
174
175 i2c_set_clientdata(i2c, max77686);
176 max77686->type = (unsigned long)of_device_get_match_data(&i2c->dev);
177 max77686->dev = &i2c->dev;
178 max77686->i2c = i2c;
179
180 max77686->irq = i2c->irq;
181
182 if (max77686->type == TYPE_MAX77686) {
183 config = &max77686_regmap_config;
184 irq_chip = &max77686_irq_chip;
185 cells = max77686_devs;
186 n_devs = ARRAY_SIZE(max77686_devs);
187 } else {
188 config = &max77802_regmap_config;
189 irq_chip = &max77802_irq_chip;
190 cells = max77802_devs;
191 n_devs = ARRAY_SIZE(max77802_devs);
192 }
193
194 max77686->regmap = devm_regmap_init_i2c(i2c, config);
195 if (IS_ERR(max77686->regmap)) {
196 ret = PTR_ERR(max77686->regmap);
197 dev_err(max77686->dev, "Failed to allocate register map: %d\n",
198 ret);
199 return ret;
200 }
201
202 ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data);
203 if (ret < 0) {
204 dev_err(max77686->dev,
205 "device not found on this channel (this is not an error)\n");
206 return -ENODEV;
207 }
208
209 ret = devm_regmap_add_irq_chip(&i2c->dev, max77686->regmap,
210 max77686->irq,
211 IRQF_ONESHOT | IRQF_SHARED, 0, irq_chip,
212 &max77686->irq_data);
213 if (ret < 0) {
214 dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret);
215 return ret;
216 }
217
218 ret = devm_mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL,
219 0, NULL);
220 if (ret < 0) {
221 dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret);
222 return ret;
223 }
224
225 return 0;
226}
227
228static int max77686_suspend(struct device *dev)
229{
230 struct i2c_client *i2c = to_i2c_client(dev);
231 struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
232
233 if (device_may_wakeup(dev))
234 enable_irq_wake(max77686->irq);
235
236 /*
237 * IRQ must be disabled during suspend because if it happens
238 * while suspended it will be handled before resuming I2C.
239 *
240 * When device is woken up from suspend (e.g. by RTC wake alarm),
241 * an interrupt occurs before resuming I2C bus controller.
242 * Interrupt handler tries to read registers but this read
243 * will fail because I2C is still suspended.
244 */
245 disable_irq(max77686->irq);
246
247 return 0;
248}
249
250static int max77686_resume(struct device *dev)
251{
252 struct i2c_client *i2c = to_i2c_client(dev);
253 struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
254
255 if (device_may_wakeup(dev))
256 disable_irq_wake(max77686->irq);
257
258 enable_irq(max77686->irq);
259
260 return 0;
261}
262
263static DEFINE_SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume);
264
265static struct i2c_driver max77686_i2c_driver = {
266 .driver = {
267 .name = "max77686",
268 .pm = pm_sleep_ptr(&max77686_pm),
269 .of_match_table = max77686_pmic_dt_match,
270 },
271 .probe = max77686_i2c_probe,
272};
273
274module_i2c_driver(max77686_i2c_driver);
275
276MODULE_DESCRIPTION("MAXIM 77686/802 multi-function core driver");
277MODULE_AUTHOR("Chiwoong Byun <[email protected]>");
278MODULE_LICENSE("GPL");