Loading...
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
34struct lp8755_mphase {
35 int nreg;
36 int buck_num[LP8755_BUCK_MAX];
37};
38
39struct 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
51static 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(rdev->regmap, 0x12 + id, ®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
65static 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(rdev->regmap, 0x08 + id, 0x20, 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(rdev->regmap, 0x08 + id, 0x20, 0x20);
86 if (ret < 0)
87 goto err_i2c;
88
89 ret = regmap_update_bits(rdev->regmap, 0x10, 0x01, 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(rdev->regmap, 0x06, 0x01 << id, regbval);
100 if (ret < 0)
101 goto err_i2c;
102 return ret;
103err_i2c:
104 dev_err(&rdev->dev, "i2c access error %s\n", __func__);
105 return ret;
106}
107
108static 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(rdev->regmap, 0x06, ®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(rdev->regmap, 0x08 + id, ®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
133err_i2c:
134 dev_err(&rdev->dev, "i2c access error %s\n", __func__);
135 return 0;
136}
137
138static const unsigned int lp8755_buck_ramp_table[] = {
139 30000, 15000, 7500, 3800, 1900, 940, 470, 230
140};
141
142static 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
167static 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
176static 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
190static 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(pchip->regmap, 0x3D, ®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
209out_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
234static 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
243static 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(pchip->dev,
259 &lp8755_regulators[buck_num], &rconfig);
260 if (IS_ERR(pchip->rdev[buck_num])) {
261 ret = PTR_ERR(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
272static 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(pchip->regmap, 0x0D, &flag0);
280 if (ret < 0)
281 goto err_i2c;
282 /* clear flag register to pull up int. pin */
283 ret = regmap_write(pchip->regmap, 0x0D, 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(pchip->rdev[icnt],
293 LP8755_EVENT_PWR_FAULT,
294 NULL);
295 }
296
297 /* read flag1 register */
298 ret = regmap_read(pchip->regmap, 0x0E, &flag1);
299 if (ret < 0)
300 goto err_i2c;
301 /* clear flag register to pull up int. pin */
302 ret = regmap_write(pchip->regmap, 0x0E, 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(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(pchip->rdev[icnt],
320 LP8755_EVENT_OVP,
321 NULL);
322 }
323 return IRQ_HANDLED;
324
325err_i2c:
326 dev_err(pchip->dev, "i2c access error %s\n", __func__);
327 return IRQ_NONE;
328}
329
330static 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(pchip->regmap, 0x0F, ®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(pchip->dev, pchip->irq, NULL,
348 lp8755_irq_handler,
349 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
350 "lp8755-irq", pchip);
351}
352
353static const struct regmap_config lp8755_regmap = {
354 .reg_bits = 8,
355 .val_bits = 8,
356 .max_register = LP8755_REG_MAX,
357};
358
359static 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(&client->dev);
364
365 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
366 dev_err(&client->dev, "i2c functionality check fail.\n");
367 return -EOPNOTSUPP;
368 }
369
370 pchip = devm_kzalloc(&client->dev,
371 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(pchip->regmap)) {
378 ret = PTR_ERR(pchip->regmap);
379 dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
380 return ret;
381 }
382 i2c_set_clientdata(client, pchip);
383
384 if (pdata != NULL) {
385 pchip->pdata = pdata;
386 pchip->mphase = pdata->mphase;
387 } else {
388 pchip->pdata = devm_kzalloc(pchip->dev,
389 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
415err:
416 /* output disable */
417 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
418 regmap_write(pchip->regmap, icnt, 0x00);
419
420 return ret;
421}
422
423static 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(pchip->regmap, icnt, 0x00);
430}
431
432static const struct i2c_device_id lp8755_id[] = {
433 { LP8755_NAME },
434 {}
435};
436
437MODULE_DEVICE_TABLE(i2c, lp8755_id);
438
439static 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
449static int __init lp8755_init(void)
450{
451 return i2c_add_driver(&lp8755_i2c_driver);
452}
453
454subsys_initcall(lp8755_init);
455
456static void __exit lp8755_exit(void)
457{
458 i2c_del_driver(&lp8755_i2c_driver);
459}
460
461module_exit(lp8755_exit);
462
463MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
464MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
465MODULE_LICENSE("GPL v2");
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/gpio.h>
17#include <linux/regmap.h>
18#include <linux/uaccess.h>
19#include <linux/regulator/driver.h>
20#include <linux/regulator/machine.h>
21#include <linux/platform_data/lp8755.h>
22
23#define LP8755_REG_BUCK0 0x00
24#define LP8755_REG_BUCK1 0x03
25#define LP8755_REG_BUCK2 0x04
26#define LP8755_REG_BUCK3 0x01
27#define LP8755_REG_BUCK4 0x05
28#define LP8755_REG_BUCK5 0x02
29#define LP8755_REG_MAX 0xFF
30
31#define LP8755_BUCK_EN_M BIT(7)
32#define LP8755_BUCK_LINEAR_OUT_MAX 0x76
33#define LP8755_BUCK_VOUT_M 0x7F
34
35struct lp8755_mphase {
36 int nreg;
37 int buck_num[LP8755_BUCK_MAX];
38};
39
40struct lp8755_chip {
41 struct device *dev;
42 struct regmap *regmap;
43 struct lp8755_platform_data *pdata;
44
45 int irq;
46 unsigned int irqmask;
47
48 int mphase;
49 struct regulator_dev *rdev[LP8755_BUCK_MAX];
50};
51
52/**
53 *lp8755_read : read a single register value from lp8755.
54 *@pchip : device to read from
55 *@reg : register to read from
56 *@val : pointer to store read value
57 */
58static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg,
59 unsigned int *val)
60{
61 return regmap_read(pchip->regmap, reg, val);
62}
63
64/**
65 *lp8755_write : write a single register value to lp8755.
66 *@pchip : device to write to
67 *@reg : register to write to
68 *@val : value to be written
69 */
70static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg,
71 unsigned int val)
72{
73 return regmap_write(pchip->regmap, reg, val);
74}
75
76/**
77 *lp8755_update_bits : set the values of bit fields in lp8755 register.
78 *@pchip : device to read from
79 *@reg : register to update
80 *@mask : bitmask to be changed
81 *@val : value for bitmask
82 */
83static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg,
84 unsigned int mask, unsigned int val)
85{
86 return regmap_update_bits(pchip->regmap, reg, mask, val);
87}
88
89static int lp8755_buck_enable_time(struct regulator_dev *rdev)
90{
91 int ret;
92 unsigned int regval;
93 enum lp8755_bucks id = rdev_get_id(rdev);
94 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
95
96 ret = lp8755_read(pchip, 0x12 + id, ®val);
97 if (ret < 0) {
98 dev_err(pchip->dev, "i2c access error %s\n", __func__);
99 return ret;
100 }
101 return (regval & 0xff) * 100;
102}
103
104static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
105{
106 int ret;
107 unsigned int regbval = 0x0;
108 enum lp8755_bucks id = rdev_get_id(rdev);
109 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
110
111 switch (mode) {
112 case REGULATOR_MODE_FAST:
113 /* forced pwm mode */
114 regbval = (0x01 << id);
115 break;
116 case REGULATOR_MODE_NORMAL:
117 /* enable automatic pwm/pfm mode */
118 ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00);
119 if (ret < 0)
120 goto err_i2c;
121 break;
122 case REGULATOR_MODE_IDLE:
123 /* enable automatic pwm/pfm/lppfm mode */
124 ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20);
125 if (ret < 0)
126 goto err_i2c;
127
128 ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01);
129 if (ret < 0)
130 goto err_i2c;
131 break;
132 default:
133 dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
134 /* forced pwm mode */
135 regbval = (0x01 << id);
136 }
137
138 ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval);
139 if (ret < 0)
140 goto err_i2c;
141 return ret;
142err_i2c:
143 dev_err(pchip->dev, "i2c access error %s\n", __func__);
144 return ret;
145}
146
147static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
148{
149 int ret;
150 unsigned int regval;
151 enum lp8755_bucks id = rdev_get_id(rdev);
152 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
153
154 ret = lp8755_read(pchip, 0x06, ®val);
155 if (ret < 0)
156 goto err_i2c;
157
158 /* mode fast means forced pwm mode */
159 if (regval & (0x01 << id))
160 return REGULATOR_MODE_FAST;
161
162 ret = lp8755_read(pchip, 0x08 + id, ®val);
163 if (ret < 0)
164 goto err_i2c;
165
166 /* mode idle means automatic pwm/pfm/lppfm mode */
167 if (regval & 0x20)
168 return REGULATOR_MODE_IDLE;
169
170 /* mode normal means automatic pwm/pfm mode */
171 return REGULATOR_MODE_NORMAL;
172
173err_i2c:
174 dev_err(pchip->dev, "i2c access error %s\n", __func__);
175 return 0;
176}
177
178static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
179{
180 int ret;
181 unsigned int regval = 0x00;
182 enum lp8755_bucks id = rdev_get_id(rdev);
183 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
184
185 /* uV/us */
186 switch (ramp) {
187 case 0 ... 230:
188 regval = 0x07;
189 break;
190 case 231 ... 470:
191 regval = 0x06;
192 break;
193 case 471 ... 940:
194 regval = 0x05;
195 break;
196 case 941 ... 1900:
197 regval = 0x04;
198 break;
199 case 1901 ... 3800:
200 regval = 0x03;
201 break;
202 case 3801 ... 7500:
203 regval = 0x02;
204 break;
205 case 7501 ... 15000:
206 regval = 0x01;
207 break;
208 case 15001 ... 30000:
209 regval = 0x00;
210 break;
211 default:
212 dev_err(pchip->dev,
213 "Not supported ramp value %d %s\n", ramp, __func__);
214 return -EINVAL;
215 }
216
217 ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval);
218 if (ret < 0)
219 goto err_i2c;
220 return ret;
221err_i2c:
222 dev_err(pchip->dev, "i2c access error %s\n", __func__);
223 return ret;
224}
225
226static const struct regulator_ops lp8755_buck_ops = {
227 .map_voltage = regulator_map_voltage_linear,
228 .list_voltage = regulator_list_voltage_linear,
229 .set_voltage_sel = regulator_set_voltage_sel_regmap,
230 .get_voltage_sel = regulator_get_voltage_sel_regmap,
231 .enable = regulator_enable_regmap,
232 .disable = regulator_disable_regmap,
233 .is_enabled = regulator_is_enabled_regmap,
234 .enable_time = lp8755_buck_enable_time,
235 .set_mode = lp8755_buck_set_mode,
236 .get_mode = lp8755_buck_get_mode,
237 .set_ramp_delay = lp8755_buck_set_ramp,
238};
239
240#define lp8755_rail(_id) "lp8755_buck"#_id
241#define lp8755_buck_init(_id)\
242{\
243 .constraints = {\
244 .name = lp8755_rail(_id),\
245 .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
246 .min_uV = 500000,\
247 .max_uV = 1675000,\
248 },\
249}
250
251static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
252 [LP8755_BUCK0] = lp8755_buck_init(0),
253 [LP8755_BUCK1] = lp8755_buck_init(1),
254 [LP8755_BUCK2] = lp8755_buck_init(2),
255 [LP8755_BUCK3] = lp8755_buck_init(3),
256 [LP8755_BUCK4] = lp8755_buck_init(4),
257 [LP8755_BUCK5] = lp8755_buck_init(5),
258};
259
260static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
261 { 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
262 { 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
263 LP8755_BUCK4, LP8755_BUCK5 } },
264 { 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
265 LP8755_BUCK5} },
266 { 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
267 { 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
268 { 2, { LP8755_BUCK0, LP8755_BUCK5} },
269 { 1, { LP8755_BUCK0} },
270 { 2, { LP8755_BUCK0, LP8755_BUCK3} },
271 { 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
272};
273
274static int lp8755_init_data(struct lp8755_chip *pchip)
275{
276 unsigned int regval;
277 int ret, icnt, buck_num;
278 struct lp8755_platform_data *pdata = pchip->pdata;
279
280 /* read back muti-phase configuration */
281 ret = lp8755_read(pchip, 0x3D, ®val);
282 if (ret < 0)
283 goto out_i2c_error;
284 pchip->mphase = regval & 0x0F;
285
286 /* set default data based on multi-phase config */
287 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
288 buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
289 pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
290 }
291 return ret;
292
293out_i2c_error:
294 dev_err(pchip->dev, "i2c access error %s\n", __func__);
295 return ret;
296}
297
298#define lp8755_buck_desc(_id)\
299{\
300 .name = lp8755_rail(_id),\
301 .id = LP8755_BUCK##_id,\
302 .ops = &lp8755_buck_ops,\
303 .n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
304 .uV_step = 10000,\
305 .min_uV = 500000,\
306 .type = REGULATOR_VOLTAGE,\
307 .owner = THIS_MODULE,\
308 .enable_reg = LP8755_REG_BUCK##_id,\
309 .enable_mask = LP8755_BUCK_EN_M,\
310 .vsel_reg = LP8755_REG_BUCK##_id,\
311 .vsel_mask = LP8755_BUCK_VOUT_M,\
312}
313
314static const struct regulator_desc lp8755_regulators[] = {
315 lp8755_buck_desc(0),
316 lp8755_buck_desc(1),
317 lp8755_buck_desc(2),
318 lp8755_buck_desc(3),
319 lp8755_buck_desc(4),
320 lp8755_buck_desc(5),
321};
322
323static int lp8755_regulator_init(struct lp8755_chip *pchip)
324{
325 int ret, icnt, buck_num;
326 struct lp8755_platform_data *pdata = pchip->pdata;
327 struct regulator_config rconfig = { };
328
329 rconfig.regmap = pchip->regmap;
330 rconfig.dev = pchip->dev;
331 rconfig.driver_data = pchip;
332
333 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
334 buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
335 rconfig.init_data = pdata->buck_data[buck_num];
336 rconfig.of_node = pchip->dev->of_node;
337 pchip->rdev[buck_num] =
338 devm_regulator_register(pchip->dev,
339 &lp8755_regulators[buck_num], &rconfig);
340 if (IS_ERR(pchip->rdev[buck_num])) {
341 ret = PTR_ERR(pchip->rdev[buck_num]);
342 pchip->rdev[buck_num] = NULL;
343 dev_err(pchip->dev, "regulator init failed: buck %d\n",
344 buck_num);
345 return ret;
346 }
347 }
348
349 return 0;
350}
351
352static irqreturn_t lp8755_irq_handler(int irq, void *data)
353{
354 int ret, icnt;
355 unsigned int flag0, flag1;
356 struct lp8755_chip *pchip = data;
357
358 /* read flag0 register */
359 ret = lp8755_read(pchip, 0x0D, &flag0);
360 if (ret < 0)
361 goto err_i2c;
362 /* clear flag register to pull up int. pin */
363 ret = lp8755_write(pchip, 0x0D, 0x00);
364 if (ret < 0)
365 goto err_i2c;
366
367 /* sent power fault detection event to specific regulator */
368 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
369 if ((flag0 & (0x4 << icnt))
370 && (pchip->irqmask & (0x04 << icnt))
371 && (pchip->rdev[icnt] != NULL)) {
372 regulator_lock(pchip->rdev[icnt]);
373 regulator_notifier_call_chain(pchip->rdev[icnt],
374 LP8755_EVENT_PWR_FAULT,
375 NULL);
376 regulator_unlock(pchip->rdev[icnt]);
377 }
378
379 /* read flag1 register */
380 ret = lp8755_read(pchip, 0x0E, &flag1);
381 if (ret < 0)
382 goto err_i2c;
383 /* clear flag register to pull up int. pin */
384 ret = lp8755_write(pchip, 0x0E, 0x00);
385 if (ret < 0)
386 goto err_i2c;
387
388 /* send OCP event to all regulator devices */
389 if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
390 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
391 if (pchip->rdev[icnt] != NULL) {
392 regulator_lock(pchip->rdev[icnt]);
393 regulator_notifier_call_chain(pchip->rdev[icnt],
394 LP8755_EVENT_OCP,
395 NULL);
396 regulator_unlock(pchip->rdev[icnt]);
397 }
398
399 /* send OVP event to all regulator devices */
400 if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
401 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
402 if (pchip->rdev[icnt] != NULL) {
403 regulator_lock(pchip->rdev[icnt]);
404 regulator_notifier_call_chain(pchip->rdev[icnt],
405 LP8755_EVENT_OVP,
406 NULL);
407 regulator_unlock(pchip->rdev[icnt]);
408 }
409 return IRQ_HANDLED;
410
411err_i2c:
412 dev_err(pchip->dev, "i2c access error %s\n", __func__);
413 return IRQ_NONE;
414}
415
416static int lp8755_int_config(struct lp8755_chip *pchip)
417{
418 int ret;
419 unsigned int regval;
420
421 if (pchip->irq == 0) {
422 dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
423 return 0;
424 }
425
426 ret = lp8755_read(pchip, 0x0F, ®val);
427 if (ret < 0) {
428 dev_err(pchip->dev, "i2c access error %s\n", __func__);
429 return ret;
430 }
431
432 pchip->irqmask = regval;
433 return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
434 lp8755_irq_handler,
435 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
436 "lp8755-irq", pchip);
437}
438
439static const struct regmap_config lp8755_regmap = {
440 .reg_bits = 8,
441 .val_bits = 8,
442 .max_register = LP8755_REG_MAX,
443};
444
445static int lp8755_probe(struct i2c_client *client,
446 const struct i2c_device_id *id)
447{
448 int ret, icnt;
449 struct lp8755_chip *pchip;
450 struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
451
452 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
453 dev_err(&client->dev, "i2c functionality check fail.\n");
454 return -EOPNOTSUPP;
455 }
456
457 pchip = devm_kzalloc(&client->dev,
458 sizeof(struct lp8755_chip), GFP_KERNEL);
459 if (!pchip)
460 return -ENOMEM;
461
462 pchip->dev = &client->dev;
463 pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
464 if (IS_ERR(pchip->regmap)) {
465 ret = PTR_ERR(pchip->regmap);
466 dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
467 return ret;
468 }
469 i2c_set_clientdata(client, pchip);
470
471 if (pdata != NULL) {
472 pchip->pdata = pdata;
473 pchip->mphase = pdata->mphase;
474 } else {
475 pchip->pdata = devm_kzalloc(pchip->dev,
476 sizeof(struct lp8755_platform_data),
477 GFP_KERNEL);
478 if (!pchip->pdata)
479 return -ENOMEM;
480 ret = lp8755_init_data(pchip);
481 if (ret < 0) {
482 dev_err(&client->dev, "fail to initialize chip\n");
483 return ret;
484 }
485 }
486
487 ret = lp8755_regulator_init(pchip);
488 if (ret < 0) {
489 dev_err(&client->dev, "fail to initialize regulators\n");
490 goto err;
491 }
492
493 pchip->irq = client->irq;
494 ret = lp8755_int_config(pchip);
495 if (ret < 0) {
496 dev_err(&client->dev, "fail to irq config\n");
497 goto err;
498 }
499
500 return ret;
501
502err:
503 /* output disable */
504 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
505 lp8755_write(pchip, icnt, 0x00);
506
507 return ret;
508}
509
510static int lp8755_remove(struct i2c_client *client)
511{
512 int icnt;
513 struct lp8755_chip *pchip = i2c_get_clientdata(client);
514
515 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
516 lp8755_write(pchip, icnt, 0x00);
517
518 return 0;
519}
520
521static const struct i2c_device_id lp8755_id[] = {
522 {LP8755_NAME, 0},
523 {}
524};
525
526MODULE_DEVICE_TABLE(i2c, lp8755_id);
527
528static struct i2c_driver lp8755_i2c_driver = {
529 .driver = {
530 .name = LP8755_NAME,
531 },
532 .probe = lp8755_probe,
533 .remove = lp8755_remove,
534 .id_table = lp8755_id,
535};
536
537static int __init lp8755_init(void)
538{
539 return i2c_add_driver(&lp8755_i2c_driver);
540}
541
542subsys_initcall(lp8755_init);
543
544static void __exit lp8755_exit(void)
545{
546 i2c_del_driver(&lp8755_i2c_driver);
547}
548
549module_exit(lp8755_exit);
550
551MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
552MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
553MODULE_LICENSE("GPL v2");