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a5736e0b MH |
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. | |
3103d44e | 12 | * Mike Rapoport <mike@compulab.co.il> |
a5736e0b MH |
13 | * |
14 | * Copyright (C) 2006-2008 Marvell International Ltd. | |
3103d44e | 15 | * Eric Miao <eric.miao@marvell.com> |
a5736e0b MH |
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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
a5736e0b MH |
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; | |
c6cc25fd | 38 | uint8_t mode; |
a5736e0b MH |
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 | ||
4e8b7026 MB |
70 | static int __adp5520_ack_bits(struct i2c_client *client, int reg, |
71 | uint8_t bit_mask) | |
a5736e0b MH |
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 | ||
890c98e3 | 112 | if (!ret && ((reg_val & bit_mask) != bit_mask)) { |
a5736e0b MH |
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 | ||
f791be49 | 206 | static int adp5520_probe(struct i2c_client *client, |
a5736e0b MH |
207 | const struct i2c_device_id *id) |
208 | { | |
334a41ce | 209 | struct adp5520_platform_data *pdata = dev_get_platdata(&client->dev); |
a5736e0b MH |
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 | ||
76ba0b89 | 225 | chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); |
a5736e0b MH |
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); | |
76ba0b89 | 246 | return ret; |
a5736e0b MH |
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 | ||
a5736e0b MH |
304 | return ret; |
305 | } | |
306 | ||
4740f73f | 307 | static int adp5520_remove(struct i2c_client *client) |
a5736e0b MH |
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); | |
a5736e0b MH |
316 | return 0; |
317 | } | |
318 | ||
938848e7 | 319 | #ifdef CONFIG_PM_SLEEP |
dc781454 | 320 | static int adp5520_suspend(struct device *dev) |
a5736e0b | 321 | { |
dc781454 | 322 | struct i2c_client *client = to_i2c_client(dev); |
a5736e0b MH |
323 | struct adp5520_chip *chip = dev_get_drvdata(&client->dev); |
324 | ||
c6cc25fd LPC |
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); | |
a5736e0b MH |
329 | return 0; |
330 | } | |
331 | ||
dc781454 | 332 | static int adp5520_resume(struct device *dev) |
a5736e0b | 333 | { |
dc781454 | 334 | struct i2c_client *client = to_i2c_client(dev); |
a5736e0b MH |
335 | struct adp5520_chip *chip = dev_get_drvdata(&client->dev); |
336 | ||
c6cc25fd | 337 | adp5520_write(chip->dev, ADP5520_MODE_STATUS, chip->mode); |
a5736e0b MH |
338 | return 0; |
339 | } | |
a5736e0b MH |
340 | #endif |
341 | ||
dc781454 MB |
342 | static SIMPLE_DEV_PM_OPS(adp5520_pm, adp5520_suspend, adp5520_resume); |
343 | ||
a5736e0b MH |
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", | |
dc781454 | 354 | .pm = &adp5520_pm, |
a5736e0b MH |
355 | }, |
356 | .probe = adp5520_probe, | |
84449216 | 357 | .remove = adp5520_remove, |
3103d44e | 358 | .id_table = adp5520_id, |
a5736e0b MH |
359 | }; |
360 | ||
099bb952 | 361 | module_i2c_driver(adp5520_driver); |
a5736e0b | 362 | |
4ded11d1 | 363 | MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>"); |
a5736e0b MH |
364 | MODULE_DESCRIPTION("ADP5520(01) PMIC-MFD Driver"); |
365 | MODULE_LICENSE("GPL"); |