Commit | Line | Data |
---|---|---|
5928f538 LD |
1 | /* |
2 | * max8973-regulator.c -- Maxim max8973 | |
3 | * | |
4 | * Regulator driver for MAXIM 8973 DC-DC step-down switching regulator. | |
5 | * | |
6 | * Copyright (c) 2012, NVIDIA Corporation. | |
7 | * | |
8 | * Author: Laxman Dewangan <ldewangan@nvidia.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation version 2. | |
13 | * | |
14 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind, | |
15 | * whether express or implied; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
22 | * 02111-1307, USA | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/err.h> | |
42dc3023 | 29 | #include <linux/of.h> |
0f7d6ece | 30 | #include <linux/of_device.h> |
5928f538 LD |
31 | #include <linux/platform_device.h> |
32 | #include <linux/regulator/driver.h> | |
33 | #include <linux/regulator/machine.h> | |
34 | #include <linux/regulator/max8973-regulator.h> | |
42dc3023 | 35 | #include <linux/regulator/of_regulator.h> |
5928f538 | 36 | #include <linux/gpio.h> |
c2ffa973 | 37 | #include <linux/of_gpio.h> |
5928f538 LD |
38 | #include <linux/i2c.h> |
39 | #include <linux/slab.h> | |
40 | #include <linux/regmap.h> | |
41 | ||
42 | /* Register definitions */ | |
43 | #define MAX8973_VOUT 0x0 | |
44 | #define MAX8973_VOUT_DVS 0x1 | |
45 | #define MAX8973_CONTROL1 0x2 | |
46 | #define MAX8973_CONTROL2 0x3 | |
47 | #define MAX8973_CHIPID1 0x4 | |
48 | #define MAX8973_CHIPID2 0x5 | |
49 | ||
50 | #define MAX8973_MAX_VOUT_REG 2 | |
51 | ||
52 | /* MAX8973_VOUT */ | |
53 | #define MAX8973_VOUT_ENABLE BIT(7) | |
54 | #define MAX8973_VOUT_MASK 0x7F | |
55 | ||
56 | /* MAX8973_VOUT_DVS */ | |
57 | #define MAX8973_DVS_VOUT_MASK 0x7F | |
58 | ||
59 | /* MAX8973_CONTROL1 */ | |
60 | #define MAX8973_SNS_ENABLE BIT(7) | |
61 | #define MAX8973_FPWM_EN_M BIT(6) | |
62 | #define MAX8973_NFSR_ENABLE BIT(5) | |
63 | #define MAX8973_AD_ENABLE BIT(4) | |
64 | #define MAX8973_BIAS_ENABLE BIT(3) | |
65 | #define MAX8973_FREQSHIFT_9PER BIT(2) | |
66 | ||
67 | #define MAX8973_RAMP_12mV_PER_US 0x0 | |
68 | #define MAX8973_RAMP_25mV_PER_US 0x1 | |
69 | #define MAX8973_RAMP_50mV_PER_US 0x2 | |
70 | #define MAX8973_RAMP_200mV_PER_US 0x3 | |
3064c1f3 | 71 | #define MAX8973_RAMP_MASK 0x3 |
5928f538 LD |
72 | |
73 | /* MAX8973_CONTROL2 */ | |
74 | #define MAX8973_WDTMR_ENABLE BIT(6) | |
75 | #define MAX8973_DISCH_ENBABLE BIT(5) | |
76 | #define MAX8973_FT_ENABLE BIT(4) | |
77 | ||
78 | #define MAX8973_CKKADV_TRIP_DISABLE 0xC | |
79 | #define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0 | |
80 | #define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4 | |
81 | #define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8 | |
82 | #define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000 | |
83 | ||
84 | #define MAX8973_INDUCTOR_MIN_30_PER 0x0 | |
85 | #define MAX8973_INDUCTOR_NOMINAL 0x1 | |
86 | #define MAX8973_INDUCTOR_PLUS_30_PER 0x2 | |
87 | #define MAX8973_INDUCTOR_PLUS_60_PER 0x3 | |
88 | #define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000 | |
89 | ||
90 | #define MAX8973_MIN_VOLATGE 606250 | |
91 | #define MAX8973_MAX_VOLATGE 1400000 | |
92 | #define MAX8973_VOLATGE_STEP 6250 | |
93 | #define MAX8973_BUCK_N_VOLTAGE 0x80 | |
94 | ||
0f7d6ece LD |
95 | enum device_id { |
96 | MAX8973, | |
97 | MAX77621 | |
98 | }; | |
99 | ||
5928f538 LD |
100 | /* Maxim 8973 chip information */ |
101 | struct max8973_chip { | |
102 | struct device *dev; | |
103 | struct regulator_desc desc; | |
5928f538 LD |
104 | struct regmap *regmap; |
105 | bool enable_external_control; | |
69eb0980 | 106 | int enable_gpio; |
5928f538 LD |
107 | int dvs_gpio; |
108 | int lru_index[MAX8973_MAX_VOUT_REG]; | |
109 | int curr_vout_val[MAX8973_MAX_VOUT_REG]; | |
110 | int curr_vout_reg; | |
111 | int curr_gpio_val; | |
db892ff6 | 112 | struct regulator_ops ops; |
0f7d6ece | 113 | enum device_id id; |
5928f538 LD |
114 | }; |
115 | ||
116 | /* | |
117 | * find_voltage_set_register: Find new voltage configuration register (VOUT). | |
118 | * The finding of the new VOUT register will be based on the LRU mechanism. | |
119 | * Each VOUT register will have different voltage configured . This | |
120 | * Function will look if any of the VOUT register have requested voltage set | |
121 | * or not. | |
122 | * - If it is already there then it will make that register as most | |
123 | * recently used and return as found so that caller need not to set | |
124 | * the VOUT register but need to set the proper gpios to select this | |
125 | * VOUT register. | |
126 | * - If requested voltage is not found then it will use the least | |
127 | * recently mechanism to get new VOUT register for new configuration | |
128 | * and will return not_found so that caller need to set new VOUT | |
129 | * register and then gpios (both). | |
130 | */ | |
131 | static bool find_voltage_set_register(struct max8973_chip *tps, | |
132 | int req_vsel, int *vout_reg, int *gpio_val) | |
133 | { | |
134 | int i; | |
135 | bool found = false; | |
136 | int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1]; | |
137 | int found_index = MAX8973_MAX_VOUT_REG - 1; | |
138 | ||
139 | for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) { | |
140 | if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) { | |
141 | new_vout_reg = tps->lru_index[i]; | |
142 | found_index = i; | |
143 | found = true; | |
144 | goto update_lru_index; | |
145 | } | |
146 | } | |
147 | ||
148 | update_lru_index: | |
149 | for (i = found_index; i > 0; i--) | |
150 | tps->lru_index[i] = tps->lru_index[i - 1]; | |
151 | ||
152 | tps->lru_index[0] = new_vout_reg; | |
153 | *gpio_val = new_vout_reg; | |
154 | *vout_reg = MAX8973_VOUT + new_vout_reg; | |
155 | return found; | |
156 | } | |
157 | ||
158 | static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev) | |
159 | { | |
160 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
161 | unsigned int data; | |
162 | int ret; | |
163 | ||
164 | ret = regmap_read(max->regmap, max->curr_vout_reg, &data); | |
165 | if (ret < 0) { | |
166 | dev_err(max->dev, "register %d read failed, err = %d\n", | |
167 | max->curr_vout_reg, ret); | |
168 | return ret; | |
169 | } | |
170 | return data & MAX8973_VOUT_MASK; | |
171 | } | |
172 | ||
173 | static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev, | |
174 | unsigned vsel) | |
175 | { | |
176 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
177 | int ret; | |
178 | bool found = false; | |
179 | int vout_reg = max->curr_vout_reg; | |
180 | int gpio_val = max->curr_gpio_val; | |
181 | ||
182 | /* | |
183 | * If gpios are available to select the VOUT register then least | |
184 | * recently used register for new configuration. | |
185 | */ | |
fa5f509f | 186 | if (gpio_is_valid(max->dvs_gpio)) |
5928f538 LD |
187 | found = find_voltage_set_register(max, vsel, |
188 | &vout_reg, &gpio_val); | |
189 | ||
190 | if (!found) { | |
191 | ret = regmap_update_bits(max->regmap, vout_reg, | |
192 | MAX8973_VOUT_MASK, vsel); | |
193 | if (ret < 0) { | |
194 | dev_err(max->dev, "register %d update failed, err %d\n", | |
195 | vout_reg, ret); | |
196 | return ret; | |
197 | } | |
198 | max->curr_vout_reg = vout_reg; | |
199 | max->curr_vout_val[gpio_val] = vsel; | |
200 | } | |
201 | ||
202 | /* Select proper VOUT register vio gpios */ | |
fa5f509f | 203 | if (gpio_is_valid(max->dvs_gpio)) { |
5928f538 LD |
204 | gpio_set_value_cansleep(max->dvs_gpio, gpio_val & 0x1); |
205 | max->curr_gpio_val = gpio_val; | |
206 | } | |
207 | return 0; | |
208 | } | |
209 | ||
210 | static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) | |
211 | { | |
212 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
213 | int ret; | |
214 | int pwm; | |
215 | ||
216 | /* Enable force PWM mode in FAST mode only. */ | |
217 | switch (mode) { | |
218 | case REGULATOR_MODE_FAST: | |
219 | pwm = MAX8973_FPWM_EN_M; | |
220 | break; | |
221 | ||
222 | case REGULATOR_MODE_NORMAL: | |
223 | pwm = 0; | |
224 | break; | |
225 | ||
226 | default: | |
227 | return -EINVAL; | |
228 | } | |
229 | ||
230 | ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1, | |
231 | MAX8973_FPWM_EN_M, pwm); | |
232 | if (ret < 0) | |
233 | dev_err(max->dev, "register %d update failed, err %d\n", | |
234 | MAX8973_CONTROL1, ret); | |
235 | return ret; | |
236 | } | |
237 | ||
238 | static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev) | |
239 | { | |
240 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
241 | unsigned int data; | |
242 | int ret; | |
243 | ||
244 | ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); | |
245 | if (ret < 0) { | |
246 | dev_err(max->dev, "register %d read failed, err %d\n", | |
247 | MAX8973_CONTROL1, ret); | |
248 | return ret; | |
249 | } | |
250 | return (data & MAX8973_FPWM_EN_M) ? | |
251 | REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; | |
252 | } | |
253 | ||
3064c1f3 LD |
254 | static int max8973_set_ramp_delay(struct regulator_dev *rdev, |
255 | int ramp_delay) | |
256 | { | |
257 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
258 | unsigned int control; | |
259 | int ret; | |
260 | int ret_val; | |
261 | ||
262 | /* Set ramp delay */ | |
263 | if (ramp_delay < 25000) { | |
264 | control = MAX8973_RAMP_12mV_PER_US; | |
265 | ret_val = 12000; | |
266 | } else if (ramp_delay < 50000) { | |
267 | control = MAX8973_RAMP_25mV_PER_US; | |
268 | ret_val = 25000; | |
269 | } else if (ramp_delay < 200000) { | |
270 | control = MAX8973_RAMP_50mV_PER_US; | |
271 | ret_val = 50000; | |
272 | } else { | |
273 | control = MAX8973_RAMP_200mV_PER_US; | |
274 | ret_val = 200000; | |
275 | } | |
276 | ||
277 | ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1, | |
278 | MAX8973_RAMP_MASK, control); | |
279 | if (ret < 0) | |
280 | dev_err(max->dev, "register %d update failed, %d", | |
281 | MAX8973_CONTROL1, ret); | |
282 | return ret; | |
283 | } | |
284 | ||
db892ff6 | 285 | static const struct regulator_ops max8973_dcdc_ops = { |
5928f538 LD |
286 | .get_voltage_sel = max8973_dcdc_get_voltage_sel, |
287 | .set_voltage_sel = max8973_dcdc_set_voltage_sel, | |
288 | .list_voltage = regulator_list_voltage_linear, | |
289 | .set_mode = max8973_dcdc_set_mode, | |
290 | .get_mode = max8973_dcdc_get_mode, | |
3064c1f3 LD |
291 | .set_voltage_time_sel = regulator_set_voltage_time_sel, |
292 | .set_ramp_delay = max8973_set_ramp_delay, | |
5928f538 LD |
293 | }; |
294 | ||
3d68dfe3 GKH |
295 | static int max8973_init_dcdc(struct max8973_chip *max, |
296 | struct max8973_regulator_platform_data *pdata) | |
5928f538 LD |
297 | { |
298 | int ret; | |
299 | uint8_t control1 = 0; | |
300 | uint8_t control2 = 0; | |
3064c1f3 LD |
301 | unsigned int data; |
302 | ||
303 | ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); | |
304 | if (ret < 0) { | |
305 | dev_err(max->dev, "register %d read failed, err = %d", | |
306 | MAX8973_CONTROL1, ret); | |
307 | return ret; | |
308 | } | |
309 | control1 = data & MAX8973_RAMP_MASK; | |
310 | switch (control1) { | |
311 | case MAX8973_RAMP_12mV_PER_US: | |
312 | max->desc.ramp_delay = 12000; | |
313 | break; | |
314 | case MAX8973_RAMP_25mV_PER_US: | |
366604ec | 315 | max->desc.ramp_delay = 25000; |
3064c1f3 LD |
316 | break; |
317 | case MAX8973_RAMP_50mV_PER_US: | |
318 | max->desc.ramp_delay = 50000; | |
319 | break; | |
320 | case MAX8973_RAMP_200mV_PER_US: | |
321 | max->desc.ramp_delay = 200000; | |
322 | break; | |
323 | } | |
5928f538 LD |
324 | |
325 | if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE) | |
326 | control1 |= MAX8973_SNS_ENABLE; | |
327 | ||
328 | if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE)) | |
329 | control1 |= MAX8973_NFSR_ENABLE; | |
330 | ||
331 | if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE) | |
332 | control1 |= MAX8973_AD_ENABLE; | |
333 | ||
dcd9ec6a | 334 | if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) { |
5928f538 | 335 | control1 |= MAX8973_BIAS_ENABLE; |
dcd9ec6a LD |
336 | max->desc.enable_time = 20; |
337 | } else { | |
338 | max->desc.enable_time = 240; | |
339 | } | |
5928f538 LD |
340 | |
341 | if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE) | |
342 | control1 |= MAX8973_FREQSHIFT_9PER; | |
343 | ||
5928f538 LD |
344 | if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE)) |
345 | control2 |= MAX8973_DISCH_ENBABLE; | |
346 | ||
347 | /* Clock advance trip configuration */ | |
348 | switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) { | |
349 | case MAX8973_CONTROL_CLKADV_TRIP_DISABLED: | |
350 | control2 |= MAX8973_CKKADV_TRIP_DISABLE; | |
351 | break; | |
352 | ||
353 | case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US: | |
354 | control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US; | |
355 | break; | |
356 | ||
357 | case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US: | |
358 | control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US; | |
359 | break; | |
360 | ||
361 | case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS: | |
362 | control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS; | |
363 | break; | |
364 | } | |
365 | ||
366 | /* Configure inductor value */ | |
367 | switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) { | |
368 | case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL: | |
369 | control2 |= MAX8973_INDUCTOR_NOMINAL; | |
370 | break; | |
371 | ||
372 | case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER: | |
373 | control2 |= MAX8973_INDUCTOR_MIN_30_PER; | |
374 | break; | |
375 | ||
376 | case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER: | |
377 | control2 |= MAX8973_INDUCTOR_PLUS_30_PER; | |
378 | break; | |
379 | ||
380 | case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER: | |
381 | control2 |= MAX8973_INDUCTOR_PLUS_60_PER; | |
382 | break; | |
383 | } | |
384 | ||
385 | ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1); | |
386 | if (ret < 0) { | |
387 | dev_err(max->dev, "register %d write failed, err = %d", | |
388 | MAX8973_CONTROL1, ret); | |
389 | return ret; | |
390 | } | |
391 | ||
392 | ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2); | |
393 | if (ret < 0) { | |
394 | dev_err(max->dev, "register %d write failed, err = %d", | |
395 | MAX8973_CONTROL2, ret); | |
396 | return ret; | |
397 | } | |
398 | ||
399 | /* If external control is enabled then disable EN bit */ | |
0f7d6ece | 400 | if (max->enable_external_control && (max->id == MAX8973)) { |
5928f538 LD |
401 | ret = regmap_update_bits(max->regmap, MAX8973_VOUT, |
402 | MAX8973_VOUT_ENABLE, 0); | |
403 | if (ret < 0) | |
404 | dev_err(max->dev, "register %d update failed, err = %d", | |
405 | MAX8973_VOUT, ret); | |
406 | } | |
407 | return ret; | |
408 | } | |
409 | ||
410 | static const struct regmap_config max8973_regmap_config = { | |
411 | .reg_bits = 8, | |
412 | .val_bits = 8, | |
413 | .max_register = MAX8973_CHIPID2, | |
414 | .cache_type = REGCACHE_RBTREE, | |
415 | }; | |
416 | ||
c2ffa973 LD |
417 | static struct max8973_regulator_platform_data *max8973_parse_dt( |
418 | struct device *dev) | |
419 | { | |
420 | struct max8973_regulator_platform_data *pdata; | |
421 | struct device_node *np = dev->of_node; | |
422 | int ret; | |
423 | u32 pval; | |
424 | ||
425 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
426 | if (!pdata) | |
427 | return NULL; | |
428 | ||
429 | pdata->enable_ext_control = of_property_read_bool(np, | |
430 | "maxim,externally-enable"); | |
69eb0980 | 431 | pdata->enable_gpio = of_get_named_gpio(np, "maxim,enable-gpio", 0); |
c2ffa973 LD |
432 | pdata->dvs_gpio = of_get_named_gpio(np, "maxim,dvs-gpio", 0); |
433 | ||
434 | ret = of_property_read_u32(np, "maxim,dvs-default-state", &pval); | |
435 | if (!ret) | |
436 | pdata->dvs_def_state = pval; | |
437 | ||
438 | if (of_property_read_bool(np, "maxim,enable-remote-sense")) | |
439 | pdata->control_flags |= MAX8973_CONTROL_REMOTE_SENSE_ENABLE; | |
440 | ||
441 | if (of_property_read_bool(np, "maxim,enable-falling-slew-rate")) | |
442 | pdata->control_flags |= | |
443 | MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE; | |
444 | ||
445 | if (of_property_read_bool(np, "maxim,enable-active-discharge")) | |
446 | pdata->control_flags |= | |
447 | MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE; | |
448 | ||
449 | if (of_property_read_bool(np, "maxim,enable-frequency-shift")) | |
450 | pdata->control_flags |= MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE; | |
451 | ||
452 | if (of_property_read_bool(np, "maxim,enable-bias-control")) | |
453 | pdata->control_flags |= MAX8973_BIAS_ENABLE; | |
454 | ||
455 | return pdata; | |
456 | } | |
457 | ||
0f7d6ece LD |
458 | static const struct of_device_id of_max8973_match_tbl[] = { |
459 | { .compatible = "maxim,max8973", .data = (void *)MAX8973, }, | |
460 | { .compatible = "maxim,max77621", .data = (void *)MAX77621, }, | |
461 | { }, | |
462 | }; | |
463 | MODULE_DEVICE_TABLE(of, of_max8973_match_tbl); | |
464 | ||
3d68dfe3 GKH |
465 | static int max8973_probe(struct i2c_client *client, |
466 | const struct i2c_device_id *id) | |
5928f538 LD |
467 | { |
468 | struct max8973_regulator_platform_data *pdata; | |
69eb0980 | 469 | struct regulator_init_data *ridata; |
5928f538 LD |
470 | struct regulator_config config = { }; |
471 | struct regulator_dev *rdev; | |
472 | struct max8973_chip *max; | |
c2ffa973 | 473 | bool pdata_from_dt = false; |
0f7d6ece | 474 | unsigned int chip_id; |
5928f538 LD |
475 | int ret; |
476 | ||
dff91d0b | 477 | pdata = dev_get_platdata(&client->dev); |
42dc3023 | 478 | |
c2ffa973 LD |
479 | if (!pdata && client->dev.of_node) { |
480 | pdata = max8973_parse_dt(&client->dev); | |
481 | pdata_from_dt = true; | |
482 | } | |
483 | ||
484 | if (!pdata) { | |
5928f538 LD |
485 | dev_err(&client->dev, "No Platform data"); |
486 | return -EIO; | |
487 | } | |
488 | ||
69eb0980 LD |
489 | if ((pdata->dvs_gpio == -EPROBE_DEFER) || |
490 | (pdata->enable_gpio == -EPROBE_DEFER)) | |
c2ffa973 LD |
491 | return -EPROBE_DEFER; |
492 | ||
5928f538 | 493 | max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL); |
21024dee | 494 | if (!max) |
5928f538 | 495 | return -ENOMEM; |
5928f538 LD |
496 | |
497 | max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config); | |
498 | if (IS_ERR(max->regmap)) { | |
499 | ret = PTR_ERR(max->regmap); | |
500 | dev_err(&client->dev, "regmap init failed, err %d\n", ret); | |
501 | return ret; | |
502 | } | |
503 | ||
0f7d6ece LD |
504 | if (client->dev.of_node) { |
505 | const struct of_device_id *match; | |
506 | ||
507 | match = of_match_device(of_match_ptr(of_max8973_match_tbl), | |
508 | &client->dev); | |
509 | if (!match) | |
510 | return -ENODATA; | |
511 | max->id = (u32)((uintptr_t)match->data); | |
512 | } else { | |
513 | max->id = id->driver_data; | |
514 | } | |
515 | ||
516 | ret = regmap_read(max->regmap, MAX8973_CHIPID1, &chip_id); | |
517 | if (ret < 0) { | |
518 | dev_err(&client->dev, "register CHIPID1 read failed, %d", ret); | |
519 | return ret; | |
520 | } | |
521 | ||
522 | dev_info(&client->dev, "CHIP-ID OTP: 0x%02x ID_M: 0x%02x\n", | |
523 | (chip_id >> 4) & 0xF, (chip_id >> 1) & 0x7); | |
524 | ||
5928f538 | 525 | i2c_set_clientdata(client, max); |
db892ff6 | 526 | max->ops = max8973_dcdc_ops; |
5928f538 LD |
527 | max->dev = &client->dev; |
528 | max->desc.name = id->name; | |
529 | max->desc.id = 0; | |
db892ff6 | 530 | max->desc.ops = &max->ops; |
5928f538 LD |
531 | max->desc.type = REGULATOR_VOLTAGE; |
532 | max->desc.owner = THIS_MODULE; | |
533 | max->desc.min_uV = MAX8973_MIN_VOLATGE; | |
534 | max->desc.uV_step = MAX8973_VOLATGE_STEP; | |
535 | max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE; | |
536 | ||
69eb0980 LD |
537 | max->dvs_gpio = (pdata->dvs_gpio) ? pdata->dvs_gpio : -EINVAL; |
538 | max->enable_gpio = (pdata->enable_gpio) ? pdata->enable_gpio : -EINVAL; | |
539 | max->enable_external_control = pdata->enable_ext_control; | |
540 | max->curr_gpio_val = pdata->dvs_def_state; | |
541 | max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state; | |
542 | ||
543 | if (gpio_is_valid(max->enable_gpio)) | |
544 | max->enable_external_control = true; | |
545 | ||
5928f538 | 546 | max->lru_index[0] = max->curr_vout_reg; |
5928f538 LD |
547 | |
548 | if (gpio_is_valid(max->dvs_gpio)) { | |
549 | int gpio_flags; | |
550 | int i; | |
551 | ||
552 | gpio_flags = (pdata->dvs_def_state) ? | |
553 | GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; | |
554 | ret = devm_gpio_request_one(&client->dev, max->dvs_gpio, | |
555 | gpio_flags, "max8973-dvs"); | |
556 | if (ret) { | |
557 | dev_err(&client->dev, | |
558 | "gpio_request for gpio %d failed, err = %d\n", | |
559 | max->dvs_gpio, ret); | |
560 | return ret; | |
561 | } | |
5928f538 LD |
562 | |
563 | /* | |
564 | * Initialize the lru index with vout_reg id | |
565 | * The index 0 will be most recently used and | |
566 | * set with the max->curr_vout_reg */ | |
567 | for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) | |
568 | max->lru_index[i] = i; | |
569 | max->lru_index[0] = max->curr_vout_reg; | |
570 | max->lru_index[max->curr_vout_reg] = 0; | |
571 | } | |
572 | ||
c2ffa973 LD |
573 | if (pdata_from_dt) |
574 | pdata->reg_init_data = of_get_regulator_init_data(&client->dev, | |
575 | client->dev.of_node, &max->desc); | |
576 | ||
0f7d6ece LD |
577 | ridata = pdata->reg_init_data; |
578 | switch (max->id) { | |
579 | case MAX8973: | |
580 | if (!pdata->enable_ext_control) { | |
581 | max->desc.enable_reg = MAX8973_VOUT; | |
582 | max->desc.enable_mask = MAX8973_VOUT_ENABLE; | |
583 | max->ops.enable = regulator_enable_regmap; | |
584 | max->ops.disable = regulator_disable_regmap; | |
585 | max->ops.is_enabled = regulator_is_enabled_regmap; | |
586 | break; | |
587 | } | |
588 | ||
589 | if (gpio_is_valid(max->enable_gpio)) { | |
590 | config.ena_gpio_flags = GPIOF_OUT_INIT_LOW; | |
591 | if (ridata && (ridata->constraints.always_on || | |
592 | ridata->constraints.boot_on)) | |
593 | config.ena_gpio_flags = GPIOF_OUT_INIT_HIGH; | |
594 | config.ena_gpio = max->enable_gpio; | |
595 | } | |
596 | break; | |
597 | ||
598 | case MAX77621: | |
599 | if (gpio_is_valid(max->enable_gpio)) { | |
600 | ret = devm_gpio_request_one(&client->dev, | |
601 | max->enable_gpio, GPIOF_OUT_INIT_HIGH, | |
602 | "max8973-en-gpio"); | |
603 | if (ret) { | |
604 | dev_err(&client->dev, | |
605 | "gpio_request for gpio %d failed: %d\n", | |
606 | max->enable_gpio, ret); | |
607 | return ret; | |
608 | } | |
609 | } | |
610 | ||
611 | max->desc.enable_reg = MAX8973_VOUT; | |
612 | max->desc.enable_mask = MAX8973_VOUT_ENABLE; | |
613 | max->ops.enable = regulator_enable_regmap; | |
614 | max->ops.disable = regulator_disable_regmap; | |
615 | max->ops.is_enabled = regulator_is_enabled_regmap; | |
616 | break; | |
617 | default: | |
618 | break; | |
619 | } | |
620 | ||
c2ffa973 LD |
621 | ret = max8973_init_dcdc(max, pdata); |
622 | if (ret < 0) { | |
623 | dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret); | |
624 | return ret; | |
5928f538 LD |
625 | } |
626 | ||
627 | config.dev = &client->dev; | |
c2ffa973 | 628 | config.init_data = pdata->reg_init_data; |
5928f538 LD |
629 | config.driver_data = max; |
630 | config.of_node = client->dev.of_node; | |
631 | config.regmap = max->regmap; | |
632 | ||
633 | /* Register the regulators */ | |
8d581fd0 | 634 | rdev = devm_regulator_register(&client->dev, &max->desc, &config); |
5928f538 LD |
635 | if (IS_ERR(rdev)) { |
636 | ret = PTR_ERR(rdev); | |
637 | dev_err(max->dev, "regulator register failed, err %d\n", ret); | |
638 | return ret; | |
639 | } | |
640 | ||
5928f538 LD |
641 | return 0; |
642 | } | |
643 | ||
5928f538 | 644 | static const struct i2c_device_id max8973_id[] = { |
0f7d6ece LD |
645 | {.name = "max8973", .driver_data = MAX8973}, |
646 | {.name = "max77621", .driver_data = MAX77621}, | |
5928f538 LD |
647 | {}, |
648 | }; | |
5928f538 LD |
649 | MODULE_DEVICE_TABLE(i2c, max8973_id); |
650 | ||
651 | static struct i2c_driver max8973_i2c_driver = { | |
652 | .driver = { | |
653 | .name = "max8973", | |
0f7d6ece | 654 | .of_match_table = of_max8973_match_tbl, |
5928f538 LD |
655 | .owner = THIS_MODULE, |
656 | }, | |
657 | .probe = max8973_probe, | |
5928f538 LD |
658 | .id_table = max8973_id, |
659 | }; | |
660 | ||
661 | static int __init max8973_init(void) | |
662 | { | |
663 | return i2c_add_driver(&max8973_i2c_driver); | |
664 | } | |
665 | subsys_initcall(max8973_init); | |
666 | ||
667 | static void __exit max8973_cleanup(void) | |
668 | { | |
669 | i2c_del_driver(&max8973_i2c_driver); | |
670 | } | |
671 | module_exit(max8973_cleanup); | |
672 | ||
673 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
674 | MODULE_DESCRIPTION("MAX8973 voltage regulator driver"); | |
675 | MODULE_LICENSE("GPL v2"); |