1 /*
2 * Base driver for Analog Devices ADP5520/ADP5501 MFD PMICs
3 * LCD Backlight: drivers/video/backlight/adp5520_bl
4 * LEDs : drivers/led/leds-adp5520
5 * GPIO : drivers/gpio/adp5520-gpio (ADP5520 only)
6 * Keys : drivers/input/keyboard/adp5520-keys (ADP5520 only)
7 *
8 * Copyright 2009 Analog Devices Inc.
9 *
10 * Derived from da903x:
11 * Copyright (C) 2008 Compulab, Ltd.
12 * Mike Rapoport <mike@compulab.co.il>
13 *
14 * Copyright (C) 2006-2008 Marvell International Ltd.
15 * Eric Miao <eric.miao@marvell.com>
16 *
17 * Licensed under the GPL-2 or later.
18 */
19
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/slab.h>
24 #include <linux/interrupt.h>
25 #include <linux/irq.h>
26 #include <linux/err.h>
27 #include <linux/i2c.h>
28
29 #include <linux/mfd/adp5520.h>
30
31 struct adp5520_chip {
32 struct i2c_client *client;
33 struct device *dev;
34 struct mutex lock;
35 struct blocking_notifier_head notifier_list;
36 int irq;
37 unsigned long id;
38 uint8_t mode;
39 };
40
__adp5520_read(struct i2c_client * client,int reg,uint8_t * val)41 static int __adp5520_read(struct i2c_client *client,
42 int reg, uint8_t *val)
43 {
44 int ret;
45
46 ret = i2c_smbus_read_byte_data(client, reg);
47 if (ret < 0) {
48 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
49 return ret;
50 }
51
52 *val = (uint8_t)ret;
53 return 0;
54 }
55
__adp5520_write(struct i2c_client * client,int reg,uint8_t val)56 static int __adp5520_write(struct i2c_client *client,
57 int reg, uint8_t val)
58 {
59 int ret;
60
61 ret = i2c_smbus_write_byte_data(client, reg, val);
62 if (ret < 0) {
63 dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
64 val, reg);
65 return ret;
66 }
67 return 0;
68 }
69
__adp5520_ack_bits(struct i2c_client * client,int reg,uint8_t bit_mask)70 static int __adp5520_ack_bits(struct i2c_client *client, int reg,
71 uint8_t bit_mask)
72 {
73 struct adp5520_chip *chip = i2c_get_clientdata(client);
74 uint8_t reg_val;
75 int ret;
76
77 mutex_lock(&chip->lock);
78
79 ret = __adp5520_read(client, reg, ®_val);
80
81 if (!ret) {
82 reg_val |= bit_mask;
83 ret = __adp5520_write(client, reg, reg_val);
84 }
85
86 mutex_unlock(&chip->lock);
87 return ret;
88 }
89
adp5520_write(struct device * dev,int reg,uint8_t val)90 int adp5520_write(struct device *dev, int reg, uint8_t val)
91 {
92 return __adp5520_write(to_i2c_client(dev), reg, val);
93 }
94 EXPORT_SYMBOL_GPL(adp5520_write);
95
adp5520_read(struct device * dev,int reg,uint8_t * val)96 int adp5520_read(struct device *dev, int reg, uint8_t *val)
97 {
98 return __adp5520_read(to_i2c_client(dev), reg, val);
99 }
100 EXPORT_SYMBOL_GPL(adp5520_read);
101
adp5520_set_bits(struct device * dev,int reg,uint8_t bit_mask)102 int adp5520_set_bits(struct device *dev, int reg, uint8_t bit_mask)
103 {
104 struct adp5520_chip *chip = dev_get_drvdata(dev);
105 uint8_t reg_val;
106 int ret;
107
108 mutex_lock(&chip->lock);
109
110 ret = __adp5520_read(chip->client, reg, ®_val);
111
112 if (!ret && ((reg_val & bit_mask) != bit_mask)) {
113 reg_val |= bit_mask;
114 ret = __adp5520_write(chip->client, reg, reg_val);
115 }
116
117 mutex_unlock(&chip->lock);
118 return ret;
119 }
120 EXPORT_SYMBOL_GPL(adp5520_set_bits);
121
adp5520_clr_bits(struct device * dev,int reg,uint8_t bit_mask)122 int adp5520_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
123 {
124 struct adp5520_chip *chip = dev_get_drvdata(dev);
125 uint8_t reg_val;
126 int ret;
127
128 mutex_lock(&chip->lock);
129
130 ret = __adp5520_read(chip->client, reg, ®_val);
131
132 if (!ret && (reg_val & bit_mask)) {
133 reg_val &= ~bit_mask;
134 ret = __adp5520_write(chip->client, reg, reg_val);
135 }
136
137 mutex_unlock(&chip->lock);
138 return ret;
139 }
140 EXPORT_SYMBOL_GPL(adp5520_clr_bits);
141
adp5520_register_notifier(struct device * dev,struct notifier_block * nb,unsigned int events)142 int adp5520_register_notifier(struct device *dev, struct notifier_block *nb,
143 unsigned int events)
144 {
145 struct adp5520_chip *chip = dev_get_drvdata(dev);
146
147 if (chip->irq) {
148 adp5520_set_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
149 events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
150 ADP5520_OVP_IEN | ADP5520_CMPR_IEN));
151
152 return blocking_notifier_chain_register(&chip->notifier_list,
153 nb);
154 }
155
156 return -ENODEV;
157 }
158 EXPORT_SYMBOL_GPL(adp5520_register_notifier);
159
adp5520_unregister_notifier(struct device * dev,struct notifier_block * nb,unsigned int events)160 int adp5520_unregister_notifier(struct device *dev, struct notifier_block *nb,
161 unsigned int events)
162 {
163 struct adp5520_chip *chip = dev_get_drvdata(dev);
164
165 adp5520_clr_bits(chip->dev, ADP5520_INTERRUPT_ENABLE,
166 events & (ADP5520_KP_IEN | ADP5520_KR_IEN |
167 ADP5520_OVP_IEN | ADP5520_CMPR_IEN));
168
169 return blocking_notifier_chain_unregister(&chip->notifier_list, nb);
170 }
171 EXPORT_SYMBOL_GPL(adp5520_unregister_notifier);
172
adp5520_irq_thread(int irq,void * data)173 static irqreturn_t adp5520_irq_thread(int irq, void *data)
174 {
175 struct adp5520_chip *chip = data;
176 unsigned int events;
177 uint8_t reg_val;
178 int ret;
179
180 ret = __adp5520_read(chip->client, ADP5520_MODE_STATUS, ®_val);
181 if (ret)
182 goto out;
183
184 events = reg_val & (ADP5520_OVP_INT | ADP5520_CMPR_INT |
185 ADP5520_GPI_INT | ADP5520_KR_INT | ADP5520_KP_INT);
186
187 blocking_notifier_call_chain(&chip->notifier_list, events, NULL);
188 /* ACK, Sticky bits are W1C */
189 __adp5520_ack_bits(chip->client, ADP5520_MODE_STATUS, events);
190
191 out:
192 return IRQ_HANDLED;
193 }
194
__remove_subdev(struct device * dev,void * unused)195 static int __remove_subdev(struct device *dev, void *unused)
196 {
197 platform_device_unregister(to_platform_device(dev));
198 return 0;
199 }
200
adp5520_remove_subdevs(struct adp5520_chip * chip)201 static int adp5520_remove_subdevs(struct adp5520_chip *chip)
202 {
203 return device_for_each_child(chip->dev, NULL, __remove_subdev);
204 }
205
adp5520_probe(struct i2c_client * client,const struct i2c_device_id * id)206 static int adp5520_probe(struct i2c_client *client,
207 const struct i2c_device_id *id)
208 {
209 struct adp5520_platform_data *pdata = dev_get_platdata(&client->dev);
210 struct platform_device *pdev;
211 struct adp5520_chip *chip;
212 int ret;
213
214 if (!i2c_check_functionality(client->adapter,
215 I2C_FUNC_SMBUS_BYTE_DATA)) {
216 dev_err(&client->dev, "SMBUS Word Data not Supported\n");
217 return -EIO;
218 }
219
220 if (pdata == NULL) {
221 dev_err(&client->dev, "missing platform data\n");
222 return -ENODEV;
223 }
224
225 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
226 if (!chip)
227 return -ENOMEM;
228
229 i2c_set_clientdata(client, chip);
230 chip->client = client;
231
232 chip->dev = &client->dev;
233 chip->irq = client->irq;
234 chip->id = id->driver_data;
235 mutex_init(&chip->lock);
236
237 if (chip->irq) {
238 BLOCKING_INIT_NOTIFIER_HEAD(&chip->notifier_list);
239
240 ret = request_threaded_irq(chip->irq, NULL, adp5520_irq_thread,
241 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
242 "adp5520", chip);
243 if (ret) {
244 dev_err(&client->dev, "failed to request irq %d\n",
245 chip->irq);
246 return ret;
247 }
248 }
249
250 ret = adp5520_write(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY);
251 if (ret) {
252 dev_err(&client->dev, "failed to write\n");
253 goto out_free_irq;
254 }
255
256 if (pdata->keys) {
257 pdev = platform_device_register_data(chip->dev, "adp5520-keys",
258 chip->id, pdata->keys, sizeof(*pdata->keys));
259 if (IS_ERR(pdev)) {
260 ret = PTR_ERR(pdev);
261 goto out_remove_subdevs;
262 }
263 }
264
265 if (pdata->gpio) {
266 pdev = platform_device_register_data(chip->dev, "adp5520-gpio",
267 chip->id, pdata->gpio, sizeof(*pdata->gpio));
268 if (IS_ERR(pdev)) {
269 ret = PTR_ERR(pdev);
270 goto out_remove_subdevs;
271 }
272 }
273
274 if (pdata->leds) {
275 pdev = platform_device_register_data(chip->dev, "adp5520-led",
276 chip->id, pdata->leds, sizeof(*pdata->leds));
277 if (IS_ERR(pdev)) {
278 ret = PTR_ERR(pdev);
279 goto out_remove_subdevs;
280 }
281 }
282
283 if (pdata->backlight) {
284 pdev = platform_device_register_data(chip->dev,
285 "adp5520-backlight",
286 chip->id,
287 pdata->backlight,
288 sizeof(*pdata->backlight));
289 if (IS_ERR(pdev)) {
290 ret = PTR_ERR(pdev);
291 goto out_remove_subdevs;
292 }
293 }
294
295 return 0;
296
297 out_remove_subdevs:
298 adp5520_remove_subdevs(chip);
299
300 out_free_irq:
301 if (chip->irq)
302 free_irq(chip->irq, chip);
303
304 return ret;
305 }
306
adp5520_remove(struct i2c_client * client)307 static int adp5520_remove(struct i2c_client *client)
308 {
309 struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
310
311 if (chip->irq)
312 free_irq(chip->irq, chip);
313
314 adp5520_remove_subdevs(chip);
315 adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
316 return 0;
317 }
318
319 #ifdef CONFIG_PM_SLEEP
adp5520_suspend(struct device * dev)320 static int adp5520_suspend(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_read(chip->dev, ADP5520_MODE_STATUS, &chip->mode);
326 /* All other bits are W1C */
327 chip->mode &= ADP5520_BL_EN | ADP5520_DIM_EN | ADP5520_nSTNBY;
328 adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
329 return 0;
330 }
331
adp5520_resume(struct device * dev)332 static int adp5520_resume(struct device *dev)
333 {
334 struct i2c_client *client = to_i2c_client(dev);
335 struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
336
337 adp5520_write(chip->dev, ADP5520_MODE_STATUS, chip->mode);
338 return 0;
339 }
340 #endif
341
342 static SIMPLE_DEV_PM_OPS(adp5520_pm, adp5520_suspend, adp5520_resume);
343
344 static const struct i2c_device_id adp5520_id[] = {
345 { "pmic-adp5520", ID_ADP5520 },
346 { "pmic-adp5501", ID_ADP5501 },
347 { }
348 };
349 MODULE_DEVICE_TABLE(i2c, adp5520_id);
350
351 static struct i2c_driver adp5520_driver = {
352 .driver = {
353 .name = "adp5520",
354 .pm = &adp5520_pm,
355 },
356 .probe = adp5520_probe,
357 .remove = adp5520_remove,
358 .id_table = adp5520_id,
359 };
360
361 module_i2c_driver(adp5520_driver);
362
363 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
364 MODULE_DESCRIPTION("ADP5520(01) PMIC-MFD Driver");
365 MODULE_LICENSE("GPL");
366