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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
32struct 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
42static 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
57static 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
71static 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
91int adp5520_write(struct device *dev, int reg, uint8_t val)
92{
93 return __adp5520_write(to_i2c_client(dev), reg, val);
94}
95EXPORT_SYMBOL_GPL(adp5520_write);
96
97int adp5520_read(struct device *dev, int reg, uint8_t *val)
98{
99 return __adp5520_read(to_i2c_client(dev), reg, val);
100}
101EXPORT_SYMBOL_GPL(adp5520_read);
102
103int 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}
121EXPORT_SYMBOL_GPL(adp5520_set_bits);
122
123int 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}
141EXPORT_SYMBOL_GPL(adp5520_clr_bits);
142
143int 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}
159EXPORT_SYMBOL_GPL(adp5520_register_notifier);
160
161int 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}
172EXPORT_SYMBOL_GPL(adp5520_unregister_notifier);
173
174static 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
190 __adp5520_ack_bits(chip->client, ADP5520_MODE_STATUS, events);
191
192out:
193 return IRQ_HANDLED;
194}
195
196static int __remove_subdev(struct device *dev, void *unused)
197{
198 platform_device_unregister(to_platform_device(dev));
199 return 0;
200}
201
202static int adp5520_remove_subdevs(struct adp5520_chip *chip)
203{
204 return device_for_each_child(chip->dev, NULL, __remove_subdev);
205}
206
207static int adp5520_probe(struct i2c_client *client,
208 const struct i2c_device_id *id)
209{
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
298out_remove_subdevs:
299 adp5520_remove_subdevs(chip);
300
301out_free_irq:
302 if (chip->irq)
303 free_irq(chip->irq, chip);
304
305 return ret;
306}
307
308#ifdef CONFIG_PM_SLEEP
309static int adp5520_suspend(struct device *dev)
310{
311 struct i2c_client *client = to_i2c_client(dev);
312 struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
313
314 adp5520_read(chip->dev, ADP5520_MODE_STATUS, &chip->mode);
315
316 chip->mode &= ADP5520_BL_EN | ADP5520_DIM_EN | ADP5520_nSTNBY;
317 adp5520_write(chip->dev, ADP5520_MODE_STATUS, 0);
318 return 0;
319}
320
321static int adp5520_resume(struct device *dev)
322{
323 struct i2c_client *client = to_i2c_client(dev);
324 struct adp5520_chip *chip = dev_get_drvdata(&client->dev);
325
326 adp5520_write(chip->dev, ADP5520_MODE_STATUS, chip->mode);
327 return 0;
328}
329#endif
330
331static SIMPLE_DEV_PM_OPS(adp5520_pm, adp5520_suspend, adp5520_resume);
332
333static const struct i2c_device_id adp5520_id[] = {
334 { "pmic-adp5520", ID_ADP5520 },
335 { "pmic-adp5501", ID_ADP5501 },
336 { }
337};
338
339static struct i2c_driver adp5520_driver = {
340 .driver = {
341 .name = "adp5520",
342 .pm = &adp5520_pm,
343 .suppress_bind_attrs = true,
344 },
345 .probe = adp5520_probe,
346 .id_table = adp5520_id,
347};
348builtin_i2c_driver(adp5520_driver);
349
