1 /*
2 * tps65217.c
3 *
4 * TPS65217 chip family multi-function driver
5 *
6 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation version 2.
11 *
12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
13 * kind, whether express or implied; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18 #include <linux/device.h>
19 #include <linux/err.h>
20 #include <linux/init.h>
21 #include <linux/interrupt.h>
22 #include <linux/i2c.h>
23 #include <linux/irq.h>
24 #include <linux/irqdomain.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/of.h>
28 #include <linux/of_device.h>
29 #include <linux/platform_device.h>
30 #include <linux/regmap.h>
31 #include <linux/slab.h>
32
33 #include <linux/mfd/core.h>
34 #include <linux/mfd/tps65217.h>
35
36 static struct resource charger_resources[] = {
37 DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_AC, "AC"),
38 DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_USB, "USB"),
39 };
40
41 static struct resource pb_resources[] = {
42 DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_PB, "PB"),
43 };
44
tps65217_irq_lock(struct irq_data * data)45 static void tps65217_irq_lock(struct irq_data *data)
46 {
47 struct tps65217 *tps = irq_data_get_irq_chip_data(data);
48
49 mutex_lock(&tps->irq_lock);
50 }
51
tps65217_irq_sync_unlock(struct irq_data * data)52 static void tps65217_irq_sync_unlock(struct irq_data *data)
53 {
54 struct tps65217 *tps = irq_data_get_irq_chip_data(data);
55 int ret;
56
57 ret = tps65217_set_bits(tps, TPS65217_REG_INT, TPS65217_INT_MASK,
58 tps->irq_mask, TPS65217_PROTECT_NONE);
59 if (ret != 0)
60 dev_err(tps->dev, "Failed to sync IRQ masks\n");
61
62 mutex_unlock(&tps->irq_lock);
63 }
64
tps65217_irq_enable(struct irq_data * data)65 static void tps65217_irq_enable(struct irq_data *data)
66 {
67 struct tps65217 *tps = irq_data_get_irq_chip_data(data);
68 u8 mask = BIT(data->hwirq) << TPS65217_INT_SHIFT;
69
70 tps->irq_mask &= ~mask;
71 }
72
tps65217_irq_disable(struct irq_data * data)73 static void tps65217_irq_disable(struct irq_data *data)
74 {
75 struct tps65217 *tps = irq_data_get_irq_chip_data(data);
76 u8 mask = BIT(data->hwirq) << TPS65217_INT_SHIFT;
77
78 tps->irq_mask |= mask;
79 }
80
81 static struct irq_chip tps65217_irq_chip = {
82 .name = "tps65217",
83 .irq_bus_lock = tps65217_irq_lock,
84 .irq_bus_sync_unlock = tps65217_irq_sync_unlock,
85 .irq_enable = tps65217_irq_enable,
86 .irq_disable = tps65217_irq_disable,
87 };
88
89 static struct mfd_cell tps65217s[] = {
90 {
91 .name = "tps65217-pmic",
92 .of_compatible = "ti,tps65217-pmic",
93 },
94 {
95 .name = "tps65217-bl",
96 .of_compatible = "ti,tps65217-bl",
97 },
98 {
99 .name = "tps65217-charger",
100 .num_resources = ARRAY_SIZE(charger_resources),
101 .resources = charger_resources,
102 .of_compatible = "ti,tps65217-charger",
103 },
104 {
105 .name = "tps65217-pwrbutton",
106 .num_resources = ARRAY_SIZE(pb_resources),
107 .resources = pb_resources,
108 .of_compatible = "ti,tps65217-pwrbutton",
109 },
110 };
111
tps65217_irq_thread(int irq,void * data)112 static irqreturn_t tps65217_irq_thread(int irq, void *data)
113 {
114 struct tps65217 *tps = data;
115 unsigned int status;
116 bool handled = false;
117 int i;
118 int ret;
119
120 ret = tps65217_reg_read(tps, TPS65217_REG_INT, &status);
121 if (ret < 0) {
122 dev_err(tps->dev, "Failed to read IRQ status: %d\n",
123 ret);
124 return IRQ_NONE;
125 }
126
127 for (i = 0; i < TPS65217_NUM_IRQ; i++) {
128 if (status & BIT(i)) {
129 handle_nested_irq(irq_find_mapping(tps->irq_domain, i));
130 handled = true;
131 }
132 }
133
134 if (handled)
135 return IRQ_HANDLED;
136
137 return IRQ_NONE;
138 }
139
tps65217_irq_map(struct irq_domain * h,unsigned int virq,irq_hw_number_t hw)140 static int tps65217_irq_map(struct irq_domain *h, unsigned int virq,
141 irq_hw_number_t hw)
142 {
143 struct tps65217 *tps = h->host_data;
144
145 irq_set_chip_data(virq, tps);
146 irq_set_chip_and_handler(virq, &tps65217_irq_chip, handle_edge_irq);
147 irq_set_nested_thread(virq, 1);
148 irq_set_parent(virq, tps->irq);
149 irq_set_noprobe(virq);
150
151 return 0;
152 }
153
154 static const struct irq_domain_ops tps65217_irq_domain_ops = {
155 .map = tps65217_irq_map,
156 };
157
tps65217_irq_init(struct tps65217 * tps,int irq)158 static int tps65217_irq_init(struct tps65217 *tps, int irq)
159 {
160 int ret;
161
162 mutex_init(&tps->irq_lock);
163 tps->irq = irq;
164
165 /* Mask all interrupt sources */
166 tps->irq_mask = TPS65217_INT_MASK;
167 tps65217_set_bits(tps, TPS65217_REG_INT, TPS65217_INT_MASK,
168 TPS65217_INT_MASK, TPS65217_PROTECT_NONE);
169
170 tps->irq_domain = irq_domain_add_linear(tps->dev->of_node,
171 TPS65217_NUM_IRQ, &tps65217_irq_domain_ops, tps);
172 if (!tps->irq_domain) {
173 dev_err(tps->dev, "Could not create IRQ domain\n");
174 return -ENOMEM;
175 }
176
177 ret = devm_request_threaded_irq(tps->dev, irq, NULL,
178 tps65217_irq_thread, IRQF_ONESHOT,
179 "tps65217-irq", tps);
180 if (ret) {
181 dev_err(tps->dev, "Failed to request IRQ %d: %d\n",
182 irq, ret);
183 return ret;
184 }
185
186 enable_irq_wake(irq);
187
188 return 0;
189 }
190
191 /**
192 * tps65217_reg_read: Read a single tps65217 register.
193 *
194 * @tps: Device to read from.
195 * @reg: Register to read.
196 * @val: Contians the value
197 */
tps65217_reg_read(struct tps65217 * tps,unsigned int reg,unsigned int * val)198 int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
199 unsigned int *val)
200 {
201 return regmap_read(tps->regmap, reg, val);
202 }
203 EXPORT_SYMBOL_GPL(tps65217_reg_read);
204
205 /**
206 * tps65217_reg_write: Write a single tps65217 register.
207 *
208 * @tps65217: Device to write to.
209 * @reg: Register to write to.
210 * @val: Value to write.
211 * @level: Password protected level
212 */
tps65217_reg_write(struct tps65217 * tps,unsigned int reg,unsigned int val,unsigned int level)213 int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
214 unsigned int val, unsigned int level)
215 {
216 int ret;
217 unsigned int xor_reg_val;
218
219 switch (level) {
220 case TPS65217_PROTECT_NONE:
221 return regmap_write(tps->regmap, reg, val);
222 case TPS65217_PROTECT_L1:
223 xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
224 ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
225 xor_reg_val);
226 if (ret < 0)
227 return ret;
228
229 return regmap_write(tps->regmap, reg, val);
230 case TPS65217_PROTECT_L2:
231 xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
232 ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
233 xor_reg_val);
234 if (ret < 0)
235 return ret;
236 ret = regmap_write(tps->regmap, reg, val);
237 if (ret < 0)
238 return ret;
239 ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
240 xor_reg_val);
241 if (ret < 0)
242 return ret;
243 return regmap_write(tps->regmap, reg, val);
244 default:
245 return -EINVAL;
246 }
247 }
248 EXPORT_SYMBOL_GPL(tps65217_reg_write);
249
250 /**
251 * tps65217_update_bits: Modify bits w.r.t mask, val and level.
252 *
253 * @tps65217: Device to write to.
254 * @reg: Register to read-write to.
255 * @mask: Mask.
256 * @val: Value to write.
257 * @level: Password protected level
258 */
tps65217_update_bits(struct tps65217 * tps,unsigned int reg,unsigned int mask,unsigned int val,unsigned int level)259 static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
260 unsigned int mask, unsigned int val, unsigned int level)
261 {
262 int ret;
263 unsigned int data;
264
265 ret = tps65217_reg_read(tps, reg, &data);
266 if (ret) {
267 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
268 return ret;
269 }
270
271 data &= ~mask;
272 data |= val & mask;
273
274 ret = tps65217_reg_write(tps, reg, data, level);
275 if (ret)
276 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
277
278 return ret;
279 }
280
tps65217_set_bits(struct tps65217 * tps,unsigned int reg,unsigned int mask,unsigned int val,unsigned int level)281 int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
282 unsigned int mask, unsigned int val, unsigned int level)
283 {
284 return tps65217_update_bits(tps, reg, mask, val, level);
285 }
286 EXPORT_SYMBOL_GPL(tps65217_set_bits);
287
tps65217_clear_bits(struct tps65217 * tps,unsigned int reg,unsigned int mask,unsigned int level)288 int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
289 unsigned int mask, unsigned int level)
290 {
291 return tps65217_update_bits(tps, reg, mask, 0, level);
292 }
293 EXPORT_SYMBOL_GPL(tps65217_clear_bits);
294
tps65217_volatile_reg(struct device * dev,unsigned int reg)295 static bool tps65217_volatile_reg(struct device *dev, unsigned int reg)
296 {
297 switch (reg) {
298 case TPS65217_REG_INT:
299 return true;
300 default:
301 return false;
302 }
303 }
304
305 static const struct regmap_config tps65217_regmap_config = {
306 .reg_bits = 8,
307 .val_bits = 8,
308
309 .max_register = TPS65217_REG_MAX,
310 .volatile_reg = tps65217_volatile_reg,
311 };
312
313 static const struct of_device_id tps65217_of_match[] = {
314 { .compatible = "ti,tps65217"},
315 { /* sentinel */ },
316 };
317 MODULE_DEVICE_TABLE(of, tps65217_of_match);
318
tps65217_probe(struct i2c_client * client)319 static int tps65217_probe(struct i2c_client *client)
320 {
321 struct tps65217 *tps;
322 unsigned int version;
323 bool status_off = false;
324 int ret;
325
326 status_off = of_property_read_bool(client->dev.of_node,
327 "ti,pmic-shutdown-controller");
328
329 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
330 if (!tps)
331 return -ENOMEM;
332
333 i2c_set_clientdata(client, tps);
334 tps->dev = &client->dev;
335
336 tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
337 if (IS_ERR(tps->regmap)) {
338 ret = PTR_ERR(tps->regmap);
339 dev_err(tps->dev, "Failed to allocate register map: %d\n",
340 ret);
341 return ret;
342 }
343
344 if (client->irq) {
345 tps65217_irq_init(tps, client->irq);
346 } else {
347 int i;
348
349 /* Don't tell children about IRQ resources which won't fire */
350 for (i = 0; i < ARRAY_SIZE(tps65217s); i++)
351 tps65217s[i].num_resources = 0;
352 }
353
354 ret = devm_mfd_add_devices(tps->dev, -1, tps65217s,
355 ARRAY_SIZE(tps65217s), NULL, 0,
356 tps->irq_domain);
357 if (ret < 0) {
358 dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
359 return ret;
360 }
361
362 ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
363 if (ret < 0) {
364 dev_err(tps->dev, "Failed to read revision register: %d\n",
365 ret);
366 return ret;
367 }
368
369 /* Set the PMIC to shutdown on PWR_EN toggle */
370 if (status_off) {
371 ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
372 TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
373 TPS65217_PROTECT_NONE);
374 if (ret)
375 dev_warn(tps->dev, "unable to set the status OFF\n");
376 }
377
378 dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
379 (version & TPS65217_CHIPID_CHIP_MASK) >> 4,
380 version & TPS65217_CHIPID_REV_MASK);
381
382 return 0;
383 }
384
tps65217_remove(struct i2c_client * client)385 static int tps65217_remove(struct i2c_client *client)
386 {
387 struct tps65217 *tps = i2c_get_clientdata(client);
388 unsigned int virq;
389 int i;
390
391 for (i = 0; i < TPS65217_NUM_IRQ; i++) {
392 virq = irq_find_mapping(tps->irq_domain, i);
393 if (virq)
394 irq_dispose_mapping(virq);
395 }
396
397 irq_domain_remove(tps->irq_domain);
398 tps->irq_domain = NULL;
399
400 return 0;
401 }
402
403 static const struct i2c_device_id tps65217_id_table[] = {
404 {"tps65217", TPS65217},
405 { /* sentinel */ }
406 };
407 MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
408
409 static struct i2c_driver tps65217_driver = {
410 .driver = {
411 .name = "tps65217",
412 .of_match_table = tps65217_of_match,
413 },
414 .id_table = tps65217_id_table,
415 .probe_new = tps65217_probe,
416 .remove = tps65217_remove,
417 };
418
tps65217_init(void)419 static int __init tps65217_init(void)
420 {
421 return i2c_add_driver(&tps65217_driver);
422 }
423 subsys_initcall(tps65217_init);
424
tps65217_exit(void)425 static void __exit tps65217_exit(void)
426 {
427 i2c_del_driver(&tps65217_driver);
428 }
429 module_exit(tps65217_exit);
430
431 MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
432 MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
433 MODULE_LICENSE("GPL v2");
434