1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Base driver for Analog Devices ADP5520/ADP5501 MFD PMICs
4 * LCD Backlight: drivers/video/backlight/adp5520_bl
5 * LEDs : drivers/led/leds-adp5520
6 * GPIO : drivers/gpio/adp5520-gpio (ADP5520 only)
7 * Keys : drivers/input/keyboard/adp5520-keys (ADP5520 only)
8 *
9 * Copyright 2009 Analog Devices Inc.
10 *
11 * Author: Michael Hennerich <michael.hennerich@analog.com>
12 *
13 * Derived from da903x:
14 * Copyright (C) 2008 Compulab, Ltd.
15 * Mike Rapoport <mike@compulab.co.il>
16 *
17 * Copyright (C) 2006-2008 Marvell International Ltd.
18 * Eric Miao <eric.miao@marvell.com>
19 */
20
21 #include <linux/kernel.h>
22 #include <linux/init.h>
23 #include <linux/platform_device.h>
24 #include <linux/slab.h>
25 #include <linux/interrupt.h>
26 #include <linux/irq.h>
27 #include <linux/err.h>
28 #include <linux/i2c.h>
29
30 #include <linux/mfd/adp5520.h>
31
32 struct adp5520_chip {
33 struct i2c_client *client;
34 struct device *dev;
35 struct mutex lock;
36 struct blocking_notifier_head notifier_list;
37 int irq;
38 unsigned long id;
39 uint8_t mode;
40 };
41
__adp5520_read(struct i2c_client * client,int reg,uint8_t * val)42 static int __adp5520_read(struct i2c_client *client,
43 int reg, uint8_t *val)
44 {
45 int ret;
46
47 ret = i2c_smbus_read_byte_data(client, reg);
48 if (ret < 0) {
49 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
50 return ret;
51 }
52
53 *val = (uint8_t)ret;
54 return 0;
55 }
56
__adp5520_write(struct i2c_client * client,int reg,uint8_t val)57 static int __adp5520_write(struct i2c_client *client,
58 int reg, uint8_t val)
59 {
60 int ret;
61
62 ret = i2c_smbus_write_byte_data(client, reg, val);
63 if (ret < 0) {
64 dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
65 val, reg);
66 return ret;
67 }
68 return 0;
69 }
70
__adp5520_ack_bits(struct i2c_client * client,int reg,uint8_t bit_mask)71 static int __adp5520_ack_bits(struct i2c_client *client, int reg,
72 uint8_t bit_mask)
73 {
74 struct adp5520_chip *chip = i2c_get_clientdata(client);
75 uint8_t reg_val;
76 int ret;
77
78 mutex_lock(&chip->lock);
79
80 ret = __adp5520_read(client, reg, ®_val);
81
82 if (!ret) {
83 reg_val |= bit_mask;
84 ret = __adp5520_write(client, reg, reg_val);
85 }
86
87 mutex_unlock(&chip->lock);
88 return ret;
89 }
90
adp5520_write(struct device * dev,int reg,uint8_t val)91 int adp5520_write(struct device *dev, int reg, uint8_t val)
92 {
93 return __adp5520_write(to_i2c_client(dev), reg, val);
94 }
95 EXPORT_SYMBOL_GPL(adp5520_write);
96
adp5520_read(struct device * dev,int reg,uint8_t * val)97 int adp5520_read(struct device *dev, int reg, uint8_t *val)
98 {
99 return __adp5520_read(to_i2c_client(dev), reg, val);
100 }
101 EXPORT_SYMBOL_GPL(adp5520_read);
102
adp5520_set_bits(struct device * dev,int reg,uint8_t bit_mask)103 int adp5520_set_bits(struct device *dev, int reg, uint8_t bit_mask)
104 {
105 struct adp5520_chip *chip = dev_get_drvdata(dev);
106 uint8_t reg_val;
107 int ret;
108
109 mutex_lock(&chip->lock);
110
111 ret = __adp5520_read(chip->client, reg, ®_val);
112
113 if (!ret && ((reg_val & bit_mask) != bit_mask)) {
114 reg_val |= bit_mask;
115 ret = __adp5520_write(chip->client, reg, reg_val);
116 }
117
118 mutex_unlock(&chip->lock);
119 return ret;
120 }
121 EXPORT_SYMBOL_GPL(adp5520_set_bits);
122
adp5520_clr_bits(struct device * dev,int reg,uint8_t bit_mask)123 int adp5520_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
124 {
125 struct adp5520_chip *chip = dev_get_drvdata(dev);
126 uint8_t reg_val;
127 int ret;
128
129 mutex_lock(&chip->lock);
130
131 ret = __adp5520_read(chip->client, reg, ®_val);
132
133 if (!ret && (reg_val & bit_mask)) {
134 reg_val &= ~bit_mask;
135 ret = __adp5520_write(chip->client, reg, reg_val);
136 }
137
138 mutex_unlock(&chip->lock);
139 return ret;
140 }
141 EXPORT_SYMBOL_GPL(adp5520_clr_bits);
142
adp5520_register_notifier(struct device * dev,struct notifier_block * nb,unsigned int events)143 int adp5520_register_notifier(struct device *dev, struct notifier_block *nb,
144 unsigned int events)
145 {
146 struct adp5520_chip *chip = dev_get_drvdata(dev);
147
148 if (chip->irq) {
149 adp5520_set_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
150 events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
151 ADP5520_OVP_IEN | ADP5520_CMPR_IEN));
152
153 return blocking_notifier_chain_register(&chip->notifier_list,
154 nb);
155 }
156
157 return -ENODEV;
158 }
159 EXPORT_SYMBOL_GPL(adp5520_register_notifier);
160
adp5520_unregister_notifier(struct device * dev,struct notifier_block * nb,unsigned int events)161 int adp5520_unregister_notifier(struct device *dev, struct notifier_block *nb,
162 unsigned int events)
163 {
164 struct adp5520_chip *chip = dev_get_drvdata(dev);
165
166 adp5520_clr_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
167 events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
168 ADP5520_OVP_IEN | ADP5520_CMPR_IEN));
169
170 return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
171 }
172 EXPORT_SYMBOL_GPL(adp5520_unregister_notifier);
173
adp5520_irq_thread(int irq,void * data)174 static irqreturn_t adp5520_irq_thread(int irq, void *data)
175 {
176 struct adp5520_chip *chip = data;
177 unsigned int events;
178 uint8_t reg_val;
179 int ret;
180
181 ret = __adp5520_read(chip->client, ADP5520_MODE_STATUS, ®_val);
182 if (ret)
183 goto out;
184
185 events = reg_val & (ADP5520_OVP_INT | ADP5520_CMPR_INT |
186 ADP5520_GPI_INT | ADP5520_KR_INT | ADP5520_KP_INT);
187
188 blocking_notifier_call_chain(&chip->notifier_list, events, NULL);
189 /* ACK, Sticky bits are W1C */
190 __adp5520_ack_bits(chip->client, ADP5520_MODE_STATUS, events);
191
192 out:
193 return IRQ_HANDLED;
194 }
195
__remove_subdev(struct device * dev,void * unused)196 static int __remove_subdev(struct device *dev, void *unused)
197 {
198 platform_device_unregister(to_platform_device(dev));
199 return 0;
200 }
201
adp5520_remove_subdevs(struct adp5520_chip * chip)202 static int adp5520_remove_subdevs(struct adp5520_chip *chip)
203 {
204 return device_for_each_child(chip->dev, NULL, __remove_subdev);
205 }
206
adp5520_probe(struct i2c_client * client)207 static int adp5520_probe(struct i2c_client *client)
208 {
209 const struct i2c_device_id *id = i2c_client_get_device_id(client);
210 struct adp5520_platform_data *pdata = dev_get_platdata(&client->dev);
211 struct platform_device *pdev;
212 struct adp5520_chip *chip;
213 int ret;
214
215 if (!i2c_check_functionality(client->adapter,
216 I2C_FUNC_SMBUS_BYTE_DATA)) {
217 dev_err(&client->dev, "SMBUS Word Data not Supported\n");
218 return -EIO;
219 }
220
221 if (pdata == NULL) {
222 dev_err(&client->dev, "missing platform data\n");
223 return -ENODEV;
224 }
225
226 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
227 if (!chip)
228 return -ENOMEM;
229
230 i2c_set_clientdata(client, chip);
231 chip->client = client;
232
233 chip->dev = &client->dev;
234 chip->irq = client->irq;
235 chip->id = id->driver_data;
236 mutex_init(&chip->lock);
237
238 if (chip->irq) {
239 BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);
240
241 ret = request_threaded_irq(chip->irq, NULL, adp5520_irq_thread,
242 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
243 "adp5520", chip);
244 if (ret) {
245 dev_err(&client->dev, "failed to request irq %d\n",
246 chip->irq);
247 return ret;
248 }
249 }
250
251 ret = adp5520_write(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
252 if (ret) {
253 dev_err(&client->dev, "failed to write\n");
254 goto out_free_irq;
255 }
256
257 if (pdata->keys) {
258 pdev = platform_device_register_data(chip->dev, "adp5520-keys",
259 chip->id, pdata->keys, sizeof(*pdata->keys));
260 if (IS_ERR(pdev)) {
261 ret = PTR_ERR(pdev);
262 goto out_remove_subdevs;
263 }
264 }
265
266 if (pdata->gpio) {
267 pdev = platform_device_register_data(chip->dev, "adp5520-gpio",
268 chip->id, pdata->gpio, sizeof(*pdata->gpio));
269 if (IS_ERR(pdev)) {
270 ret = PTR_ERR(pdev);
271 goto out_remove_subdevs;
272 }
273 }
274
275 if (pdata->leds) {
276 pdev = platform_device_register_data(chip->dev, "adp5520-led",
277 chip->id, pdata->leds, sizeof(*pdata->leds));
278 if (IS_ERR(pdev)) {
279 ret = PTR_ERR(pdev);
280 goto out_remove_subdevs;
281 }
282 }
283
284 if (pdata->backlight) {
285 pdev = platform_device_register_data(chip->dev,
286 "adp5520-backlight",
287 chip->id,
288 pdata->backlight,
289 sizeof(*pdata->backlight));
290 if (IS_ERR(pdev)) {
291 ret = PTR_ERR(pdev);
292 goto out_remove_subdevs;
293 }
294 }
295
296 return 0;
297
298 out_remove_subdevs:
299 adp5520_remove_subdevs(chip);
300
301 out_free_irq:
302 if (chip->irq)
303 free_irq(chip->irq, chip);
304
305 return ret;
306 }
307
adp5520_suspend(struct device * dev)308 static int adp5520_suspend(struct device *dev)
309 {
310 struct i2c_client *client = to_i2c_client(dev);
311 struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
312
313 adp5520_read(chip->dev, ADP5520_MODE_STATUS, &chip->mode);
314 /* All other bits are W1C */
315 chip->mode &= ADP5520_BL_EN | ADP5520_DIM_EN | ADP5520_nSTNBY;
316 adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
317 return 0;
318 }
319
adp5520_resume(struct device * dev)320 static int adp5520_resume(struct device *dev)
321 {
322 struct i2c_client *client = to_i2c_client(dev);
323 struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
324
325 adp5520_write(chip->dev, ADP5520_MODE_STATUS, chip->mode);
326 return 0;
327 }
328
329 static DEFINE_SIMPLE_DEV_PM_OPS(adp5520_pm, adp5520_suspend, adp5520_resume);
330
331 static const struct i2c_device_id adp5520_id[] = {
332 { "pmic-adp5520", ID_ADP5520 },
333 { "pmic-adp5501", ID_ADP5501 },
334 { }
335 };
336
337 static struct i2c_driver adp5520_driver = {
338 .driver = {
339 .name = "adp5520",
340 .pm = pm_sleep_ptr(&adp5520_pm),
341 .suppress_bind_attrs = true,
342 },
343 .probe = adp5520_probe,
344 .id_table = adp5520_id,
345 };
346 builtin_i2c_driver(adp5520_driver);
347