Commit | Line | Data |
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dae8a969 | 1 | /* |
a259f389 | 2 | * max77686.c - mfd core driver for the Maxim 77686/802 |
dae8a969 JL |
3 | * |
4 | * Copyright (C) 2012 Samsung Electronics | |
630fd98c | 5 | * Chiwoong Byun <woong.byun@samsung.com> |
dae8a969 JL |
6 | * Jonghwa Lee <jonghwa3.lee@samsung.com> |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | * | |
22 | * This driver is based on max8997.c | |
23 | */ | |
24 | ||
25 | #include <linux/export.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/i2c.h> | |
6f1c1e71 JMC |
28 | #include <linux/irq.h> |
29 | #include <linux/interrupt.h> | |
dae8a969 JL |
30 | #include <linux/pm_runtime.h> |
31 | #include <linux/module.h> | |
dae8a969 JL |
32 | #include <linux/mfd/core.h> |
33 | #include <linux/mfd/max77686.h> | |
34 | #include <linux/mfd/max77686-private.h> | |
35 | #include <linux/err.h> | |
2a048d3b | 36 | #include <linux/of.h> |
68e61f75 | 37 | #include <linux/of_device.h> |
dae8a969 | 38 | |
7c0517b1 | 39 | static const struct mfd_cell max77686_devs[] = { |
dae8a969 JL |
40 | { .name = "max77686-pmic", }, |
41 | { .name = "max77686-rtc", }, | |
c0fa7e10 | 42 | { .name = "max77686-clk", }, |
dae8a969 JL |
43 | }; |
44 | ||
a259f389 JMC |
45 | static const struct mfd_cell max77802_devs[] = { |
46 | { .name = "max77802-pmic", }, | |
47 | { .name = "max77802-clk", }, | |
48 | { .name = "max77802-rtc", }, | |
49 | }; | |
50 | ||
51 | static bool max77802_pmic_is_accessible_reg(struct device *dev, | |
52 | unsigned int reg) | |
53 | { | |
b87d9a0f | 54 | return reg < MAX77802_REG_PMIC_END; |
a259f389 JMC |
55 | } |
56 | ||
57 | static bool max77802_rtc_is_accessible_reg(struct device *dev, | |
58 | unsigned int reg) | |
59 | { | |
60 | return (reg >= MAX77802_RTC_INT && reg < MAX77802_RTC_END); | |
61 | } | |
62 | ||
63 | static bool max77802_is_accessible_reg(struct device *dev, unsigned int reg) | |
64 | { | |
65 | return (max77802_pmic_is_accessible_reg(dev, reg) || | |
66 | max77802_rtc_is_accessible_reg(dev, reg)); | |
67 | } | |
68 | ||
69 | static bool max77802_pmic_is_precious_reg(struct device *dev, unsigned int reg) | |
70 | { | |
71 | return (reg == MAX77802_REG_INTSRC || reg == MAX77802_REG_INT1 || | |
72 | reg == MAX77802_REG_INT2); | |
73 | } | |
74 | ||
75 | static bool max77802_rtc_is_precious_reg(struct device *dev, unsigned int reg) | |
76 | { | |
77 | return (reg == MAX77802_RTC_INT || | |
78 | reg == MAX77802_RTC_UPDATE0 || | |
79 | reg == MAX77802_RTC_UPDATE1); | |
80 | } | |
81 | ||
82 | static bool max77802_is_precious_reg(struct device *dev, unsigned int reg) | |
83 | { | |
84 | return (max77802_pmic_is_precious_reg(dev, reg) || | |
85 | max77802_rtc_is_precious_reg(dev, reg)); | |
86 | } | |
87 | ||
88 | static bool max77802_pmic_is_volatile_reg(struct device *dev, unsigned int reg) | |
89 | { | |
90 | return (max77802_is_precious_reg(dev, reg) || | |
91 | reg == MAX77802_REG_STATUS1 || reg == MAX77802_REG_STATUS2 || | |
92 | reg == MAX77802_REG_PWRON); | |
93 | } | |
94 | ||
95 | static bool max77802_rtc_is_volatile_reg(struct device *dev, unsigned int reg) | |
96 | { | |
97 | return (max77802_rtc_is_precious_reg(dev, reg) || | |
98 | reg == MAX77802_RTC_SEC || | |
99 | reg == MAX77802_RTC_MIN || | |
100 | reg == MAX77802_RTC_HOUR || | |
101 | reg == MAX77802_RTC_WEEKDAY || | |
102 | reg == MAX77802_RTC_MONTH || | |
103 | reg == MAX77802_RTC_YEAR || | |
104 | reg == MAX77802_RTC_DATE); | |
105 | } | |
106 | ||
107 | static bool max77802_is_volatile_reg(struct device *dev, unsigned int reg) | |
108 | { | |
109 | return (max77802_pmic_is_volatile_reg(dev, reg) || | |
110 | max77802_rtc_is_volatile_reg(dev, reg)); | |
111 | } | |
112 | ||
68be231c | 113 | static const struct regmap_config max77686_regmap_config = { |
dae8a969 JL |
114 | .reg_bits = 8, |
115 | .val_bits = 8, | |
116 | }; | |
117 | ||
68be231c | 118 | static const struct regmap_config max77802_regmap_config = { |
a259f389 JMC |
119 | .reg_bits = 8, |
120 | .val_bits = 8, | |
121 | .writeable_reg = max77802_is_accessible_reg, | |
122 | .readable_reg = max77802_is_accessible_reg, | |
123 | .precious_reg = max77802_is_precious_reg, | |
124 | .volatile_reg = max77802_is_volatile_reg, | |
125 | .name = "max77802-pmic", | |
126 | .cache_type = REGCACHE_RBTREE, | |
127 | }; | |
128 | ||
6f1c1e71 JMC |
129 | static const struct regmap_irq max77686_irqs[] = { |
130 | /* INT1 interrupts */ | |
131 | { .reg_offset = 0, .mask = MAX77686_INT1_PWRONF_MSK, }, | |
132 | { .reg_offset = 0, .mask = MAX77686_INT1_PWRONR_MSK, }, | |
133 | { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBF_MSK, }, | |
134 | { .reg_offset = 0, .mask = MAX77686_INT1_JIGONBR_MSK, }, | |
135 | { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBF_MSK, }, | |
136 | { .reg_offset = 0, .mask = MAX77686_INT1_ACOKBR_MSK, }, | |
137 | { .reg_offset = 0, .mask = MAX77686_INT1_ONKEY1S_MSK, }, | |
138 | { .reg_offset = 0, .mask = MAX77686_INT1_MRSTB_MSK, }, | |
139 | /* INT2 interrupts */ | |
140 | { .reg_offset = 1, .mask = MAX77686_INT2_140C_MSK, }, | |
141 | { .reg_offset = 1, .mask = MAX77686_INT2_120C_MSK, }, | |
142 | }; | |
143 | ||
144 | static const struct regmap_irq_chip max77686_irq_chip = { | |
145 | .name = "max77686-pmic", | |
146 | .status_base = MAX77686_REG_INT1, | |
147 | .mask_base = MAX77686_REG_INT1MSK, | |
148 | .num_regs = 2, | |
149 | .irqs = max77686_irqs, | |
150 | .num_irqs = ARRAY_SIZE(max77686_irqs), | |
151 | }; | |
152 | ||
a259f389 JMC |
153 | static const struct regmap_irq_chip max77802_irq_chip = { |
154 | .name = "max77802-pmic", | |
155 | .status_base = MAX77802_REG_INT1, | |
156 | .mask_base = MAX77802_REG_INT1MSK, | |
157 | .num_regs = 2, | |
158 | .irqs = max77686_irqs, /* same masks as 77686 */ | |
159 | .num_irqs = ARRAY_SIZE(max77686_irqs), | |
160 | }; | |
161 | ||
b68ece3d | 162 | static const struct of_device_id max77686_pmic_dt_match[] = { |
a259f389 JMC |
163 | { |
164 | .compatible = "maxim,max77686", | |
165 | .data = (void *)TYPE_MAX77686, | |
166 | }, | |
167 | { | |
168 | .compatible = "maxim,max77802", | |
169 | .data = (void *)TYPE_MAX77802, | |
170 | }, | |
171 | { }, | |
2984fc00 | 172 | }; |
7f8ada1a | 173 | MODULE_DEVICE_TABLE(of, max77686_pmic_dt_match); |
2984fc00 | 174 | |
dae8a969 JL |
175 | static int max77686_i2c_probe(struct i2c_client *i2c, |
176 | const struct i2c_device_id *id) | |
177 | { | |
c1516f84 | 178 | struct max77686_dev *max77686 = NULL; |
dae8a969 JL |
179 | unsigned int data; |
180 | int ret = 0; | |
a259f389 JMC |
181 | const struct regmap_config *config; |
182 | const struct regmap_irq_chip *irq_chip; | |
a259f389 JMC |
183 | const struct mfd_cell *cells; |
184 | int n_devs; | |
dae8a969 | 185 | |
742413a4 LJ |
186 | max77686 = devm_kzalloc(&i2c->dev, |
187 | sizeof(struct max77686_dev), GFP_KERNEL); | |
c0e0fcda | 188 | if (!max77686) |
dae8a969 JL |
189 | return -ENOMEM; |
190 | ||
dae8a969 | 191 | i2c_set_clientdata(i2c, max77686); |
68e61f75 | 192 | max77686->type = (unsigned long)of_device_get_match_data(&i2c->dev); |
dae8a969 JL |
193 | max77686->dev = &i2c->dev; |
194 | max77686->i2c = i2c; | |
dae8a969 | 195 | |
2b40459b | 196 | max77686->irq = i2c->irq; |
dae8a969 | 197 | |
a259f389 JMC |
198 | if (max77686->type == TYPE_MAX77686) { |
199 | config = &max77686_regmap_config; | |
200 | irq_chip = &max77686_irq_chip; | |
a259f389 JMC |
201 | cells = max77686_devs; |
202 | n_devs = ARRAY_SIZE(max77686_devs); | |
203 | } else { | |
204 | config = &max77802_regmap_config; | |
205 | irq_chip = &max77802_irq_chip; | |
a259f389 JMC |
206 | cells = max77802_devs; |
207 | n_devs = ARRAY_SIZE(max77802_devs); | |
208 | } | |
209 | ||
210 | max77686->regmap = devm_regmap_init_i2c(i2c, config); | |
136d982e AL |
211 | if (IS_ERR(max77686->regmap)) { |
212 | ret = PTR_ERR(max77686->regmap); | |
213 | dev_err(max77686->dev, "Failed to allocate register map: %d\n", | |
214 | ret); | |
136d982e AL |
215 | return ret; |
216 | } | |
217 | ||
c0e0fcda JMC |
218 | ret = regmap_read(max77686->regmap, MAX77686_REG_DEVICE_ID, &data); |
219 | if (ret < 0) { | |
dae8a969 JL |
220 | dev_err(max77686->dev, |
221 | "device not found on this channel (this is not an error)\n"); | |
742413a4 | 222 | return -ENODEV; |
6f1c1e71 | 223 | } |
dae8a969 | 224 | |
1a5422c9 LD |
225 | ret = devm_regmap_add_irq_chip(&i2c->dev, max77686->regmap, |
226 | max77686->irq, | |
227 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT | | |
228 | IRQF_SHARED, 0, irq_chip, | |
229 | &max77686->irq_data); | |
f3937549 | 230 | if (ret < 0) { |
6f1c1e71 | 231 | dev_err(&i2c->dev, "failed to add PMIC irq chip: %d\n", ret); |
f3937549 | 232 | return ret; |
6f1c1e71 | 233 | } |
dae8a969 | 234 | |
1a5422c9 LD |
235 | ret = devm_mfd_add_devices(max77686->dev, -1, cells, n_devs, NULL, |
236 | 0, NULL); | |
742413a4 | 237 | if (ret < 0) { |
6f1c1e71 | 238 | dev_err(&i2c->dev, "failed to add MFD devices: %d\n", ret); |
1a5422c9 | 239 | return ret; |
742413a4 | 240 | } |
dae8a969 | 241 | |
dae8a969 JL |
242 | return 0; |
243 | } | |
244 | ||
245 | static const struct i2c_device_id max77686_i2c_id[] = { | |
246 | { "max77686", TYPE_MAX77686 }, | |
95a6f715 | 247 | { "max77802", TYPE_MAX77802 }, |
dae8a969 JL |
248 | { } |
249 | }; | |
250 | MODULE_DEVICE_TABLE(i2c, max77686_i2c_id); | |
251 | ||
2b52b5d5 JMC |
252 | #ifdef CONFIG_PM_SLEEP |
253 | static int max77686_suspend(struct device *dev) | |
254 | { | |
1b5420e1 | 255 | struct i2c_client *i2c = to_i2c_client(dev); |
2b52b5d5 JMC |
256 | struct max77686_dev *max77686 = i2c_get_clientdata(i2c); |
257 | ||
258 | if (device_may_wakeup(dev)) | |
259 | enable_irq_wake(max77686->irq); | |
260 | ||
261 | /* | |
262 | * IRQ must be disabled during suspend because if it happens | |
263 | * while suspended it will be handled before resuming I2C. | |
264 | * | |
265 | * When device is woken up from suspend (e.g. by RTC wake alarm), | |
266 | * an interrupt occurs before resuming I2C bus controller. | |
267 | * Interrupt handler tries to read registers but this read | |
268 | * will fail because I2C is still suspended. | |
269 | */ | |
270 | disable_irq(max77686->irq); | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | static int max77686_resume(struct device *dev) | |
276 | { | |
1b5420e1 | 277 | struct i2c_client *i2c = to_i2c_client(dev); |
2b52b5d5 JMC |
278 | struct max77686_dev *max77686 = i2c_get_clientdata(i2c); |
279 | ||
280 | if (device_may_wakeup(dev)) | |
281 | disable_irq_wake(max77686->irq); | |
282 | ||
283 | enable_irq(max77686->irq); | |
284 | ||
285 | return 0; | |
286 | } | |
287 | #endif /* CONFIG_PM_SLEEP */ | |
288 | ||
289 | static SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume); | |
290 | ||
dae8a969 JL |
291 | static struct i2c_driver max77686_i2c_driver = { |
292 | .driver = { | |
293 | .name = "max77686", | |
2b52b5d5 | 294 | .pm = &max77686_pm, |
c1516f84 | 295 | .of_match_table = of_match_ptr(max77686_pmic_dt_match), |
dae8a969 JL |
296 | }, |
297 | .probe = max77686_i2c_probe, | |
dae8a969 JL |
298 | .id_table = max77686_i2c_id, |
299 | }; | |
300 | ||
8a0aee4a | 301 | module_i2c_driver(max77686_i2c_driver); |
dae8a969 | 302 | |
a259f389 | 303 | MODULE_DESCRIPTION("MAXIM 77686/802 multi-function core driver"); |
dae8a969 JL |
304 | MODULE_AUTHOR("Chiwoong Byun <woong.byun@samsung.com>"); |
305 | MODULE_LICENSE("GPL"); |