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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/init.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 | }; |
40 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
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 | |
195 | static int __remove_subdev(struct device *dev, void *unused) |
196 | { |
197 | platform_device_unregister(to_platform_device(dev)); |
198 | return 0; |
199 | } |
200 | |
201 | static int adp5520_remove_subdevs(struct adp5520_chip *chip) |
202 | { |
203 | return device_for_each_child(chip->dev, NULL, __remove_subdev); |
204 | } |
205 | |
206 | static int adp5520_probe(struct i2c_client *client, |
207 | const struct i2c_device_id *id) |
208 | { |
209 | struct adp5520_platform_data *pdata = client->dev.platform_data; |
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 = kzalloc(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 | goto out_free_chip; |
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 | out_free_chip: |
305 | kfree(chip); |
306 | |
307 | return ret; |
308 | } |
309 | |
310 | static int adp5520_remove(struct i2c_client *client) |
311 | { |
312 | struct adp5520_chip *chip = dev_get_drvdata(&client->dev); |
313 | |
314 | if (chip->irq) |
315 | free_irq(chip->irq, chip); |
316 | |
317 | adp5520_remove_subdevs(chip); |
318 | adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0); |
319 | kfree(chip); |
320 | return 0; |
321 | } |
322 | |
323 | #ifdef CONFIG_PM_SLEEP |
324 | static int adp5520_suspend(struct device *dev) |
325 | { |
326 | struct i2c_client *client = to_i2c_client(dev); |
327 | struct adp5520_chip *chip = dev_get_drvdata(&client->dev); |
328 | |
329 | adp5520_clr_bits(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY); |
330 | return 0; |
331 | } |
332 | |
333 | static int adp5520_resume(struct device *dev) |
334 | { |
335 | struct i2c_client *client = to_i2c_client(dev); |
336 | struct adp5520_chip *chip = dev_get_drvdata(&client->dev); |
337 | |
338 | adp5520_set_bits(chip->dev, ADP5520_MODE_STATUS, ADP5520_nSTNBY); |
339 | return 0; |
340 | } |
341 | #endif |
342 | |
343 | static SIMPLE_DEV_PM_OPS(adp5520_pm, adp5520_suspend, adp5520_resume); |
344 | |
345 | static const struct i2c_device_id adp5520_id[] = { |
346 | { "pmic-adp5520", ID_ADP5520 }, |
347 | { "pmic-adp5501", ID_ADP5501 }, |
348 | { } |
349 | }; |
350 | MODULE_DEVICE_TABLE(i2c, adp5520_id); |
351 | |
352 | static struct i2c_driver adp5520_driver = { |
353 | .driver = { |
354 | .name = "adp5520", |
355 | .owner = THIS_MODULE, |
356 | .pm = &adp5520_pm, |
357 | }, |
358 | .probe = adp5520_probe, |
359 | .remove = adp5520_remove, |
360 | .id_table = adp5520_id, |
361 | }; |
362 | |
363 | static int __init adp5520_init(void) |
364 | { |
365 | return i2c_add_driver(&adp5520_driver); |
366 | } |
367 | module_init(adp5520_init); |
368 | |
369 | static void __exit adp5520_exit(void) |
370 | { |
371 | i2c_del_driver(&adp5520_driver); |
372 | } |
373 | module_exit(adp5520_exit); |
374 | |
375 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
376 | MODULE_DESCRIPTION("ADP5520(01) PMIC-MFD Driver"); |
377 | MODULE_LICENSE("GPL"); |
378 |
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