1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * LP8755 High Performance Power Management Unit : System Interface Driver |
4 | * (based on rev. 0.26) |
5 | * Copyright 2012 Texas Instruments |
6 | * |
7 | * Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com> |
8 | */ |
9 | |
10 | #include <linux/module.h> |
11 | #include <linux/slab.h> |
12 | #include <linux/i2c.h> |
13 | #include <linux/err.h> |
14 | #include <linux/irq.h> |
15 | #include <linux/interrupt.h> |
16 | #include <linux/regmap.h> |
17 | #include <linux/uaccess.h> |
18 | #include <linux/regulator/driver.h> |
19 | #include <linux/regulator/machine.h> |
20 | #include <linux/platform_data/lp8755.h> |
21 | |
22 | #define LP8755_REG_BUCK0 0x00 |
23 | #define LP8755_REG_BUCK1 0x03 |
24 | #define LP8755_REG_BUCK2 0x04 |
25 | #define LP8755_REG_BUCK3 0x01 |
26 | #define LP8755_REG_BUCK4 0x05 |
27 | #define LP8755_REG_BUCK5 0x02 |
28 | #define LP8755_REG_MAX 0xFF |
29 | |
30 | #define LP8755_BUCK_EN_M BIT(7) |
31 | #define LP8755_BUCK_LINEAR_OUT_MAX 0x76 |
32 | #define LP8755_BUCK_VOUT_M 0x7F |
33 | |
34 | struct lp8755_mphase { |
35 | int nreg; |
36 | int buck_num[LP8755_BUCK_MAX]; |
37 | }; |
38 | |
39 | struct lp8755_chip { |
40 | struct device *dev; |
41 | struct regmap *regmap; |
42 | struct lp8755_platform_data *pdata; |
43 | |
44 | int irq; |
45 | unsigned int irqmask; |
46 | |
47 | int mphase; |
48 | struct regulator_dev *rdev[LP8755_BUCK_MAX]; |
49 | }; |
50 | |
51 | static int lp8755_buck_enable_time(struct regulator_dev *rdev) |
52 | { |
53 | int ret; |
54 | unsigned int regval; |
55 | enum lp8755_bucks id = rdev_get_id(rdev); |
56 | |
57 | ret = regmap_read(map: rdev->regmap, reg: 0x12 + id, val: ®val); |
58 | if (ret < 0) { |
59 | dev_err(&rdev->dev, "i2c access error %s\n" , __func__); |
60 | return ret; |
61 | } |
62 | return (regval & 0xff) * 100; |
63 | } |
64 | |
65 | static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode) |
66 | { |
67 | int ret; |
68 | unsigned int regbval = 0x0; |
69 | enum lp8755_bucks id = rdev_get_id(rdev); |
70 | struct lp8755_chip *pchip = rdev_get_drvdata(rdev); |
71 | |
72 | switch (mode) { |
73 | case REGULATOR_MODE_FAST: |
74 | /* forced pwm mode */ |
75 | regbval = (0x01 << id); |
76 | break; |
77 | case REGULATOR_MODE_NORMAL: |
78 | /* enable automatic pwm/pfm mode */ |
79 | ret = regmap_update_bits(map: rdev->regmap, reg: 0x08 + id, mask: 0x20, val: 0x00); |
80 | if (ret < 0) |
81 | goto err_i2c; |
82 | break; |
83 | case REGULATOR_MODE_IDLE: |
84 | /* enable automatic pwm/pfm/lppfm mode */ |
85 | ret = regmap_update_bits(map: rdev->regmap, reg: 0x08 + id, mask: 0x20, val: 0x20); |
86 | if (ret < 0) |
87 | goto err_i2c; |
88 | |
89 | ret = regmap_update_bits(map: rdev->regmap, reg: 0x10, mask: 0x01, val: 0x01); |
90 | if (ret < 0) |
91 | goto err_i2c; |
92 | break; |
93 | default: |
94 | dev_err(pchip->dev, "Not supported buck mode %s\n" , __func__); |
95 | /* forced pwm mode */ |
96 | regbval = (0x01 << id); |
97 | } |
98 | |
99 | ret = regmap_update_bits(map: rdev->regmap, reg: 0x06, mask: 0x01 << id, val: regbval); |
100 | if (ret < 0) |
101 | goto err_i2c; |
102 | return ret; |
103 | err_i2c: |
104 | dev_err(&rdev->dev, "i2c access error %s\n" , __func__); |
105 | return ret; |
106 | } |
107 | |
108 | static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev) |
109 | { |
110 | int ret; |
111 | unsigned int regval; |
112 | enum lp8755_bucks id = rdev_get_id(rdev); |
113 | |
114 | ret = regmap_read(map: rdev->regmap, reg: 0x06, val: ®val); |
115 | if (ret < 0) |
116 | goto err_i2c; |
117 | |
118 | /* mode fast means forced pwm mode */ |
119 | if (regval & (0x01 << id)) |
120 | return REGULATOR_MODE_FAST; |
121 | |
122 | ret = regmap_read(map: rdev->regmap, reg: 0x08 + id, val: ®val); |
123 | if (ret < 0) |
124 | goto err_i2c; |
125 | |
126 | /* mode idle means automatic pwm/pfm/lppfm mode */ |
127 | if (regval & 0x20) |
128 | return REGULATOR_MODE_IDLE; |
129 | |
130 | /* mode normal means automatic pwm/pfm mode */ |
131 | return REGULATOR_MODE_NORMAL; |
132 | |
133 | err_i2c: |
134 | dev_err(&rdev->dev, "i2c access error %s\n" , __func__); |
135 | return 0; |
136 | } |
137 | |
138 | static const unsigned int lp8755_buck_ramp_table[] = { |
139 | 30000, 15000, 7500, 3800, 1900, 940, 470, 230 |
140 | }; |
141 | |
142 | static const struct regulator_ops lp8755_buck_ops = { |
143 | .map_voltage = regulator_map_voltage_linear, |
144 | .list_voltage = regulator_list_voltage_linear, |
145 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
146 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
147 | .enable = regulator_enable_regmap, |
148 | .disable = regulator_disable_regmap, |
149 | .is_enabled = regulator_is_enabled_regmap, |
150 | .enable_time = lp8755_buck_enable_time, |
151 | .set_mode = lp8755_buck_set_mode, |
152 | .get_mode = lp8755_buck_get_mode, |
153 | .set_ramp_delay = regulator_set_ramp_delay_regmap, |
154 | }; |
155 | |
156 | #define lp8755_rail(_id) "lp8755_buck"#_id |
157 | #define lp8755_buck_init(_id)\ |
158 | {\ |
159 | .constraints = {\ |
160 | .name = lp8755_rail(_id),\ |
161 | .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\ |
162 | .min_uV = 500000,\ |
163 | .max_uV = 1675000,\ |
164 | },\ |
165 | } |
166 | |
167 | static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = { |
168 | [LP8755_BUCK0] = lp8755_buck_init(0), |
169 | [LP8755_BUCK1] = lp8755_buck_init(1), |
170 | [LP8755_BUCK2] = lp8755_buck_init(2), |
171 | [LP8755_BUCK3] = lp8755_buck_init(3), |
172 | [LP8755_BUCK4] = lp8755_buck_init(4), |
173 | [LP8755_BUCK5] = lp8755_buck_init(5), |
174 | }; |
175 | |
176 | static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = { |
177 | { 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } }, |
178 | { 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3, |
179 | LP8755_BUCK4, LP8755_BUCK5 } }, |
180 | { 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4, |
181 | LP8755_BUCK5} }, |
182 | { 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} }, |
183 | { 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} }, |
184 | { 2, { LP8755_BUCK0, LP8755_BUCK5} }, |
185 | { 1, { LP8755_BUCK0} }, |
186 | { 2, { LP8755_BUCK0, LP8755_BUCK3} }, |
187 | { 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} }, |
188 | }; |
189 | |
190 | static int lp8755_init_data(struct lp8755_chip *pchip) |
191 | { |
192 | unsigned int regval; |
193 | int ret, icnt, buck_num; |
194 | struct lp8755_platform_data *pdata = pchip->pdata; |
195 | |
196 | /* read back muti-phase configuration */ |
197 | ret = regmap_read(map: pchip->regmap, reg: 0x3D, val: ®val); |
198 | if (ret < 0) |
199 | goto out_i2c_error; |
200 | pchip->mphase = regval & 0x0F; |
201 | |
202 | /* set default data based on multi-phase config */ |
203 | for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) { |
204 | buck_num = mphase_buck[pchip->mphase].buck_num[icnt]; |
205 | pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num]; |
206 | } |
207 | return ret; |
208 | |
209 | out_i2c_error: |
210 | dev_err(pchip->dev, "i2c access error %s\n" , __func__); |
211 | return ret; |
212 | } |
213 | |
214 | #define lp8755_buck_desc(_id)\ |
215 | {\ |
216 | .name = lp8755_rail(_id),\ |
217 | .id = LP8755_BUCK##_id,\ |
218 | .ops = &lp8755_buck_ops,\ |
219 | .n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\ |
220 | .uV_step = 10000,\ |
221 | .min_uV = 500000,\ |
222 | .type = REGULATOR_VOLTAGE,\ |
223 | .owner = THIS_MODULE,\ |
224 | .enable_reg = LP8755_REG_BUCK##_id,\ |
225 | .enable_mask = LP8755_BUCK_EN_M,\ |
226 | .vsel_reg = LP8755_REG_BUCK##_id,\ |
227 | .vsel_mask = LP8755_BUCK_VOUT_M,\ |
228 | .ramp_reg = (LP8755_BUCK##_id) + 0x7,\ |
229 | .ramp_mask = 0x7,\ |
230 | .ramp_delay_table = lp8755_buck_ramp_table,\ |
231 | .n_ramp_values = ARRAY_SIZE(lp8755_buck_ramp_table),\ |
232 | } |
233 | |
234 | static const struct regulator_desc lp8755_regulators[] = { |
235 | lp8755_buck_desc(0), |
236 | lp8755_buck_desc(1), |
237 | lp8755_buck_desc(2), |
238 | lp8755_buck_desc(3), |
239 | lp8755_buck_desc(4), |
240 | lp8755_buck_desc(5), |
241 | }; |
242 | |
243 | static int lp8755_regulator_init(struct lp8755_chip *pchip) |
244 | { |
245 | int ret, icnt, buck_num; |
246 | struct lp8755_platform_data *pdata = pchip->pdata; |
247 | struct regulator_config rconfig = { }; |
248 | |
249 | rconfig.regmap = pchip->regmap; |
250 | rconfig.dev = pchip->dev; |
251 | rconfig.driver_data = pchip; |
252 | |
253 | for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) { |
254 | buck_num = mphase_buck[pchip->mphase].buck_num[icnt]; |
255 | rconfig.init_data = pdata->buck_data[buck_num]; |
256 | rconfig.of_node = pchip->dev->of_node; |
257 | pchip->rdev[buck_num] = |
258 | devm_regulator_register(dev: pchip->dev, |
259 | regulator_desc: &lp8755_regulators[buck_num], config: &rconfig); |
260 | if (IS_ERR(ptr: pchip->rdev[buck_num])) { |
261 | ret = PTR_ERR(ptr: pchip->rdev[buck_num]); |
262 | pchip->rdev[buck_num] = NULL; |
263 | dev_err(pchip->dev, "regulator init failed: buck %d\n" , |
264 | buck_num); |
265 | return ret; |
266 | } |
267 | } |
268 | |
269 | return 0; |
270 | } |
271 | |
272 | static irqreturn_t lp8755_irq_handler(int irq, void *data) |
273 | { |
274 | int ret, icnt; |
275 | unsigned int flag0, flag1; |
276 | struct lp8755_chip *pchip = data; |
277 | |
278 | /* read flag0 register */ |
279 | ret = regmap_read(map: pchip->regmap, reg: 0x0D, val: &flag0); |
280 | if (ret < 0) |
281 | goto err_i2c; |
282 | /* clear flag register to pull up int. pin */ |
283 | ret = regmap_write(map: pchip->regmap, reg: 0x0D, val: 0x00); |
284 | if (ret < 0) |
285 | goto err_i2c; |
286 | |
287 | /* sent power fault detection event to specific regulator */ |
288 | for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
289 | if ((flag0 & (0x4 << icnt)) |
290 | && (pchip->irqmask & (0x04 << icnt)) |
291 | && (pchip->rdev[icnt] != NULL)) { |
292 | regulator_notifier_call_chain(rdev: pchip->rdev[icnt], |
293 | LP8755_EVENT_PWR_FAULT, |
294 | NULL); |
295 | } |
296 | |
297 | /* read flag1 register */ |
298 | ret = regmap_read(map: pchip->regmap, reg: 0x0E, val: &flag1); |
299 | if (ret < 0) |
300 | goto err_i2c; |
301 | /* clear flag register to pull up int. pin */ |
302 | ret = regmap_write(map: pchip->regmap, reg: 0x0E, val: 0x00); |
303 | if (ret < 0) |
304 | goto err_i2c; |
305 | |
306 | /* send OCP event to all regulator devices */ |
307 | if ((flag1 & 0x01) && (pchip->irqmask & 0x01)) |
308 | for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
309 | if (pchip->rdev[icnt] != NULL) { |
310 | regulator_notifier_call_chain(rdev: pchip->rdev[icnt], |
311 | LP8755_EVENT_OCP, |
312 | NULL); |
313 | } |
314 | |
315 | /* send OVP event to all regulator devices */ |
316 | if ((flag1 & 0x02) && (pchip->irqmask & 0x02)) |
317 | for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
318 | if (pchip->rdev[icnt] != NULL) { |
319 | regulator_notifier_call_chain(rdev: pchip->rdev[icnt], |
320 | LP8755_EVENT_OVP, |
321 | NULL); |
322 | } |
323 | return IRQ_HANDLED; |
324 | |
325 | err_i2c: |
326 | dev_err(pchip->dev, "i2c access error %s\n" , __func__); |
327 | return IRQ_NONE; |
328 | } |
329 | |
330 | static int lp8755_int_config(struct lp8755_chip *pchip) |
331 | { |
332 | int ret; |
333 | unsigned int regval; |
334 | |
335 | if (pchip->irq == 0) { |
336 | dev_warn(pchip->dev, "not use interrupt : %s\n" , __func__); |
337 | return 0; |
338 | } |
339 | |
340 | ret = regmap_read(map: pchip->regmap, reg: 0x0F, val: ®val); |
341 | if (ret < 0) { |
342 | dev_err(pchip->dev, "i2c access error %s\n" , __func__); |
343 | return ret; |
344 | } |
345 | |
346 | pchip->irqmask = regval; |
347 | return devm_request_threaded_irq(dev: pchip->dev, irq: pchip->irq, NULL, |
348 | thread_fn: lp8755_irq_handler, |
349 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
350 | devname: "lp8755-irq" , dev_id: pchip); |
351 | } |
352 | |
353 | static const struct regmap_config lp8755_regmap = { |
354 | .reg_bits = 8, |
355 | .val_bits = 8, |
356 | .max_register = LP8755_REG_MAX, |
357 | }; |
358 | |
359 | static int lp8755_probe(struct i2c_client *client) |
360 | { |
361 | int ret, icnt; |
362 | struct lp8755_chip *pchip; |
363 | struct lp8755_platform_data *pdata = dev_get_platdata(dev: &client->dev); |
364 | |
365 | if (!i2c_check_functionality(adap: client->adapter, I2C_FUNC_I2C)) { |
366 | dev_err(&client->dev, "i2c functionality check fail.\n" ); |
367 | return -EOPNOTSUPP; |
368 | } |
369 | |
370 | pchip = devm_kzalloc(dev: &client->dev, |
371 | size: sizeof(struct lp8755_chip), GFP_KERNEL); |
372 | if (!pchip) |
373 | return -ENOMEM; |
374 | |
375 | pchip->dev = &client->dev; |
376 | pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap); |
377 | if (IS_ERR(ptr: pchip->regmap)) { |
378 | ret = PTR_ERR(ptr: pchip->regmap); |
379 | dev_err(&client->dev, "fail to allocate regmap %d\n" , ret); |
380 | return ret; |
381 | } |
382 | i2c_set_clientdata(client, data: pchip); |
383 | |
384 | if (pdata != NULL) { |
385 | pchip->pdata = pdata; |
386 | pchip->mphase = pdata->mphase; |
387 | } else { |
388 | pchip->pdata = devm_kzalloc(dev: pchip->dev, |
389 | size: sizeof(struct lp8755_platform_data), |
390 | GFP_KERNEL); |
391 | if (!pchip->pdata) |
392 | return -ENOMEM; |
393 | ret = lp8755_init_data(pchip); |
394 | if (ret < 0) { |
395 | dev_err(&client->dev, "fail to initialize chip\n" ); |
396 | return ret; |
397 | } |
398 | } |
399 | |
400 | ret = lp8755_regulator_init(pchip); |
401 | if (ret < 0) { |
402 | dev_err(&client->dev, "fail to initialize regulators\n" ); |
403 | goto err; |
404 | } |
405 | |
406 | pchip->irq = client->irq; |
407 | ret = lp8755_int_config(pchip); |
408 | if (ret < 0) { |
409 | dev_err(&client->dev, "fail to irq config\n" ); |
410 | goto err; |
411 | } |
412 | |
413 | return ret; |
414 | |
415 | err: |
416 | /* output disable */ |
417 | for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
418 | regmap_write(map: pchip->regmap, reg: icnt, val: 0x00); |
419 | |
420 | return ret; |
421 | } |
422 | |
423 | static void lp8755_remove(struct i2c_client *client) |
424 | { |
425 | int icnt; |
426 | struct lp8755_chip *pchip = i2c_get_clientdata(client); |
427 | |
428 | for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++) |
429 | regmap_write(map: pchip->regmap, reg: icnt, val: 0x00); |
430 | } |
431 | |
432 | static const struct i2c_device_id lp8755_id[] = { |
433 | {LP8755_NAME, 0}, |
434 | {} |
435 | }; |
436 | |
437 | MODULE_DEVICE_TABLE(i2c, lp8755_id); |
438 | |
439 | static struct i2c_driver lp8755_i2c_driver = { |
440 | .driver = { |
441 | .name = LP8755_NAME, |
442 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
443 | }, |
444 | .probe = lp8755_probe, |
445 | .remove = lp8755_remove, |
446 | .id_table = lp8755_id, |
447 | }; |
448 | |
449 | static int __init lp8755_init(void) |
450 | { |
451 | return i2c_add_driver(&lp8755_i2c_driver); |
452 | } |
453 | |
454 | subsys_initcall(lp8755_init); |
455 | |
456 | static void __exit lp8755_exit(void) |
457 | { |
458 | i2c_del_driver(driver: &lp8755_i2c_driver); |
459 | } |
460 | |
461 | module_exit(lp8755_exit); |
462 | |
463 | MODULE_DESCRIPTION("Texas Instruments lp8755 driver" ); |
464 | MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>" ); |
465 | MODULE_LICENSE("GPL v2" ); |
466 | |