2 * LP8755 High Performance Power Management Unit : System Interface Driver
4 * Copyright 2012 Texas Instruments
6 * Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/i2c.h>
17 #include <linux/err.h>
18 #include <linux/irq.h>
19 #include <linux/interrupt.h>
20 #include <linux/gpio.h>
21 #include <linux/regmap.h>
22 #include <linux/uaccess.h>
23 #include <linux/regulator/driver.h>
24 #include <linux/regulator/machine.h>
25 #include <linux/platform_data/lp8755.h>
27 #define LP8755_REG_BUCK0 0x00
28 #define LP8755_REG_BUCK1 0x03
29 #define LP8755_REG_BUCK2 0x04
30 #define LP8755_REG_BUCK3 0x01
31 #define LP8755_REG_BUCK4 0x05
32 #define LP8755_REG_BUCK5 0x02
33 #define LP8755_REG_MAX 0xFF
35 #define LP8755_BUCK_EN_M BIT(7)
36 #define LP8755_BUCK_LINEAR_OUT_MAX 0x76
37 #define LP8755_BUCK_VOUT_M 0x7F
39 struct lp8755_mphase {
41 int buck_num[LP8755_BUCK_MAX];
46 struct regmap *regmap;
47 struct lp8755_platform_data *pdata;
53 struct regulator_dev *rdev[LP8755_BUCK_MAX];
57 *lp8755_read : read a single register value from lp8755.
58 *@pchip : device to read from
59 *@reg : register to read from
60 *@val : pointer to store read value
62 static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg,
65 return regmap_read(pchip->regmap, reg, val);
69 *lp8755_write : write a single register value to lp8755.
70 *@pchip : device to write to
71 *@reg : register to write to
72 *@val : value to be written
74 static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg,
77 return regmap_write(pchip->regmap, reg, val);
81 *lp8755_update_bits : set the values of bit fields in lp8755 register.
82 *@pchip : device to read from
83 *@reg : register to update
84 *@mask : bitmask to be changed
85 *@val : value for bitmask
87 static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg,
88 unsigned int mask, unsigned int val)
90 return regmap_update_bits(pchip->regmap, reg, mask, val);
93 static int lp8755_buck_enable_time(struct regulator_dev *rdev)
97 enum lp8755_bucks id = rdev_get_id(rdev);
98 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
100 ret = lp8755_read(pchip, 0x12 + id, ®val);
102 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
105 return (regval & 0xff) * 100;
108 static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
111 unsigned int regbval = 0x0;
112 enum lp8755_bucks id = rdev_get_id(rdev);
113 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
116 case REGULATOR_MODE_FAST:
117 /* forced pwm mode */
118 regbval = (0x01 << id);
120 case REGULATOR_MODE_NORMAL:
121 /* enable automatic pwm/pfm mode */
122 ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00);
126 case REGULATOR_MODE_IDLE:
127 /* enable automatic pwm/pfm/lppfm mode */
128 ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20);
132 ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01);
137 dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
138 /* forced pwm mode */
139 regbval = (0x01 << id);
142 ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval);
147 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
151 static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
155 enum lp8755_bucks id = rdev_get_id(rdev);
156 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
158 ret = lp8755_read(pchip, 0x06, ®val);
162 /* mode fast means forced pwm mode */
163 if (regval & (0x01 << id))
164 return REGULATOR_MODE_FAST;
166 ret = lp8755_read(pchip, 0x08 + id, ®val);
170 /* mode idle means automatic pwm/pfm/lppfm mode */
172 return REGULATOR_MODE_IDLE;
174 /* mode normal means automatic pwm/pfm mode */
175 return REGULATOR_MODE_NORMAL;
178 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
182 static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
185 unsigned int regval = 0x00;
186 enum lp8755_bucks id = rdev_get_id(rdev);
187 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
212 case 15001 ... 30000:
217 "Not supported ramp value %d %s\n", ramp, __func__);
221 ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval);
226 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
230 static struct regulator_ops lp8755_buck_ops = {
231 .map_voltage = regulator_map_voltage_linear,
232 .list_voltage = regulator_list_voltage_linear,
233 .set_voltage_sel = regulator_set_voltage_sel_regmap,
234 .get_voltage_sel = regulator_get_voltage_sel_regmap,
235 .enable = regulator_enable_regmap,
236 .disable = regulator_disable_regmap,
237 .is_enabled = regulator_is_enabled_regmap,
238 .enable_time = lp8755_buck_enable_time,
239 .set_mode = lp8755_buck_set_mode,
240 .get_mode = lp8755_buck_get_mode,
241 .set_ramp_delay = lp8755_buck_set_ramp,
244 #define lp8755_rail(_id) "lp8755_buck"#_id
245 #define lp8755_buck_init(_id)\
248 .name = lp8755_rail(_id),\
249 .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
255 static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
256 [LP8755_BUCK0] = lp8755_buck_init(0),
257 [LP8755_BUCK1] = lp8755_buck_init(1),
258 [LP8755_BUCK2] = lp8755_buck_init(2),
259 [LP8755_BUCK3] = lp8755_buck_init(3),
260 [LP8755_BUCK4] = lp8755_buck_init(4),
261 [LP8755_BUCK5] = lp8755_buck_init(5),
264 static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
265 { 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
266 { 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
267 LP8755_BUCK4, LP8755_BUCK5 } },
268 { 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
270 { 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
271 { 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
272 { 2, { LP8755_BUCK0, LP8755_BUCK5} },
273 { 1, { LP8755_BUCK0} },
274 { 2, { LP8755_BUCK0, LP8755_BUCK3} },
275 { 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
278 static int lp8755_init_data(struct lp8755_chip *pchip)
281 int ret, icnt, buck_num;
282 struct lp8755_platform_data *pdata = pchip->pdata;
284 /* read back muti-phase configuration */
285 ret = lp8755_read(pchip, 0x3D, ®val);
288 pchip->mphase = regval & 0x0F;
290 /* set default data based on multi-phase config */
291 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
292 buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
293 pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
298 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
302 #define lp8755_buck_desc(_id)\
304 .name = lp8755_rail(_id),\
305 .id = LP8755_BUCK##_id,\
306 .ops = &lp8755_buck_ops,\
307 .n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
310 .type = REGULATOR_VOLTAGE,\
311 .owner = THIS_MODULE,\
312 .enable_reg = LP8755_REG_BUCK##_id,\
313 .enable_mask = LP8755_BUCK_EN_M,\
314 .vsel_reg = LP8755_REG_BUCK##_id,\
315 .vsel_mask = LP8755_BUCK_VOUT_M,\
318 static struct regulator_desc lp8755_regulators[] = {
327 static int lp8755_regulator_init(struct lp8755_chip *pchip)
329 int ret, icnt, buck_num;
330 struct lp8755_platform_data *pdata = pchip->pdata;
331 struct regulator_config rconfig = { };
333 rconfig.regmap = pchip->regmap;
334 rconfig.dev = pchip->dev;
335 rconfig.driver_data = pchip;
337 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
338 buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
339 rconfig.init_data = pdata->buck_data[buck_num];
340 rconfig.of_node = pchip->dev->of_node;
341 pchip->rdev[buck_num] =
342 devm_regulator_register(pchip->dev,
343 &lp8755_regulators[buck_num], &rconfig);
344 if (IS_ERR(pchip->rdev[buck_num])) {
345 ret = PTR_ERR(pchip->rdev[buck_num]);
346 pchip->rdev[buck_num] = NULL;
347 dev_err(pchip->dev, "regulator init failed: buck %d\n",
356 static irqreturn_t lp8755_irq_handler(int irq, void *data)
359 unsigned int flag0, flag1;
360 struct lp8755_chip *pchip = data;
362 /* read flag0 register */
363 ret = lp8755_read(pchip, 0x0D, &flag0);
366 /* clear flag register to pull up int. pin */
367 ret = lp8755_write(pchip, 0x0D, 0x00);
371 /* sent power fault detection event to specific regulator */
372 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
373 if ((flag0 & (0x4 << icnt))
374 && (pchip->irqmask & (0x04 << icnt))
375 && (pchip->rdev[icnt] != NULL))
376 regulator_notifier_call_chain(pchip->rdev[icnt],
377 LP8755_EVENT_PWR_FAULT,
380 /* read flag1 register */
381 ret = lp8755_read(pchip, 0x0E, &flag1);
384 /* clear flag register to pull up int. pin */
385 ret = lp8755_write(pchip, 0x0E, 0x00);
389 /* send OCP event to all regualtor devices */
390 if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
391 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
392 if (pchip->rdev[icnt] != NULL)
393 regulator_notifier_call_chain(pchip->rdev[icnt],
397 /* send OVP event to all regualtor devices */
398 if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
399 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
400 if (pchip->rdev[icnt] != NULL)
401 regulator_notifier_call_chain(pchip->rdev[icnt],
407 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
411 static int lp8755_int_config(struct lp8755_chip *pchip)
416 if (pchip->irq == 0) {
417 dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
421 ret = lp8755_read(pchip, 0x0F, ®val);
424 pchip->irqmask = regval;
425 ret = request_threaded_irq(pchip->irq, NULL, lp8755_irq_handler,
426 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
427 "lp8755-irq", pchip);
434 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
438 static const struct regmap_config lp8755_regmap = {
441 .max_register = LP8755_REG_MAX,
444 static int lp8755_probe(struct i2c_client *client,
445 const struct i2c_device_id *id)
448 struct lp8755_chip *pchip;
449 struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
451 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
452 dev_err(&client->dev, "i2c functionality check fail.\n");
456 pchip = devm_kzalloc(&client->dev,
457 sizeof(struct lp8755_chip), GFP_KERNEL);
461 pchip->dev = &client->dev;
462 pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
463 if (IS_ERR(pchip->regmap)) {
464 ret = PTR_ERR(pchip->regmap);
465 dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
468 i2c_set_clientdata(client, pchip);
471 pchip->pdata = pdata;
472 pchip->mphase = pdata->mphase;
474 pchip->pdata = devm_kzalloc(pchip->dev,
475 sizeof(struct lp8755_platform_data),
479 ret = lp8755_init_data(pchip);
481 dev_err(&client->dev, "fail to initialize chip\n");
486 ret = lp8755_regulator_init(pchip);
488 dev_err(&client->dev, "fail to initialize regulators\n");
492 pchip->irq = client->irq;
493 ret = lp8755_int_config(pchip);
495 dev_err(&client->dev, "fail to irq config\n");
503 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
504 lp8755_write(pchip, icnt, 0x00);
509 static int lp8755_remove(struct i2c_client *client)
512 struct lp8755_chip *pchip = i2c_get_clientdata(client);
514 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
515 lp8755_write(pchip, icnt, 0x00);
518 free_irq(pchip->irq, pchip);
523 static const struct i2c_device_id lp8755_id[] = {
528 MODULE_DEVICE_TABLE(i2c, lp8755_id);
530 static struct i2c_driver lp8755_i2c_driver = {
534 .probe = lp8755_probe,
535 .remove = lp8755_remove,
536 .id_table = lp8755_id,
539 static int __init lp8755_init(void)
541 return i2c_add_driver(&lp8755_i2c_driver);
544 subsys_initcall(lp8755_init);
546 static void __exit lp8755_exit(void)
548 i2c_del_driver(&lp8755_i2c_driver);
551 module_exit(lp8755_exit);
553 MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
554 MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
555 MODULE_LICENSE("GPL v2");