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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> |
5928f538 LD |
30 | #include <linux/platform_device.h> |
31 | #include <linux/regulator/driver.h> | |
32 | #include <linux/regulator/machine.h> | |
33 | #include <linux/regulator/max8973-regulator.h> | |
42dc3023 | 34 | #include <linux/regulator/of_regulator.h> |
5928f538 LD |
35 | #include <linux/gpio.h> |
36 | #include <linux/i2c.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/regmap.h> | |
39 | ||
40 | /* Register definitions */ | |
41 | #define MAX8973_VOUT 0x0 | |
42 | #define MAX8973_VOUT_DVS 0x1 | |
43 | #define MAX8973_CONTROL1 0x2 | |
44 | #define MAX8973_CONTROL2 0x3 | |
45 | #define MAX8973_CHIPID1 0x4 | |
46 | #define MAX8973_CHIPID2 0x5 | |
47 | ||
48 | #define MAX8973_MAX_VOUT_REG 2 | |
49 | ||
50 | /* MAX8973_VOUT */ | |
51 | #define MAX8973_VOUT_ENABLE BIT(7) | |
52 | #define MAX8973_VOUT_MASK 0x7F | |
53 | ||
54 | /* MAX8973_VOUT_DVS */ | |
55 | #define MAX8973_DVS_VOUT_MASK 0x7F | |
56 | ||
57 | /* MAX8973_CONTROL1 */ | |
58 | #define MAX8973_SNS_ENABLE BIT(7) | |
59 | #define MAX8973_FPWM_EN_M BIT(6) | |
60 | #define MAX8973_NFSR_ENABLE BIT(5) | |
61 | #define MAX8973_AD_ENABLE BIT(4) | |
62 | #define MAX8973_BIAS_ENABLE BIT(3) | |
63 | #define MAX8973_FREQSHIFT_9PER BIT(2) | |
64 | ||
65 | #define MAX8973_RAMP_12mV_PER_US 0x0 | |
66 | #define MAX8973_RAMP_25mV_PER_US 0x1 | |
67 | #define MAX8973_RAMP_50mV_PER_US 0x2 | |
68 | #define MAX8973_RAMP_200mV_PER_US 0x3 | |
69 | ||
70 | /* MAX8973_CONTROL2 */ | |
71 | #define MAX8973_WDTMR_ENABLE BIT(6) | |
72 | #define MAX8973_DISCH_ENBABLE BIT(5) | |
73 | #define MAX8973_FT_ENABLE BIT(4) | |
74 | ||
75 | #define MAX8973_CKKADV_TRIP_DISABLE 0xC | |
76 | #define MAX8973_CKKADV_TRIP_75mV_PER_US 0x0 | |
77 | #define MAX8973_CKKADV_TRIP_150mV_PER_US 0x4 | |
78 | #define MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS 0x8 | |
79 | #define MAX8973_CONTROL_CLKADV_TRIP_MASK 0x00030000 | |
80 | ||
81 | #define MAX8973_INDUCTOR_MIN_30_PER 0x0 | |
82 | #define MAX8973_INDUCTOR_NOMINAL 0x1 | |
83 | #define MAX8973_INDUCTOR_PLUS_30_PER 0x2 | |
84 | #define MAX8973_INDUCTOR_PLUS_60_PER 0x3 | |
85 | #define MAX8973_CONTROL_INDUCTOR_VALUE_MASK 0x00300000 | |
86 | ||
87 | #define MAX8973_MIN_VOLATGE 606250 | |
88 | #define MAX8973_MAX_VOLATGE 1400000 | |
89 | #define MAX8973_VOLATGE_STEP 6250 | |
90 | #define MAX8973_BUCK_N_VOLTAGE 0x80 | |
91 | ||
92 | /* Maxim 8973 chip information */ | |
93 | struct max8973_chip { | |
94 | struct device *dev; | |
95 | struct regulator_desc desc; | |
5928f538 LD |
96 | struct regmap *regmap; |
97 | bool enable_external_control; | |
98 | int dvs_gpio; | |
99 | int lru_index[MAX8973_MAX_VOUT_REG]; | |
100 | int curr_vout_val[MAX8973_MAX_VOUT_REG]; | |
101 | int curr_vout_reg; | |
102 | int curr_gpio_val; | |
103 | bool valid_dvs_gpio; | |
db892ff6 | 104 | struct regulator_ops ops; |
5928f538 LD |
105 | }; |
106 | ||
107 | /* | |
108 | * find_voltage_set_register: Find new voltage configuration register (VOUT). | |
109 | * The finding of the new VOUT register will be based on the LRU mechanism. | |
110 | * Each VOUT register will have different voltage configured . This | |
111 | * Function will look if any of the VOUT register have requested voltage set | |
112 | * or not. | |
113 | * - If it is already there then it will make that register as most | |
114 | * recently used and return as found so that caller need not to set | |
115 | * the VOUT register but need to set the proper gpios to select this | |
116 | * VOUT register. | |
117 | * - If requested voltage is not found then it will use the least | |
118 | * recently mechanism to get new VOUT register for new configuration | |
119 | * and will return not_found so that caller need to set new VOUT | |
120 | * register and then gpios (both). | |
121 | */ | |
122 | static bool find_voltage_set_register(struct max8973_chip *tps, | |
123 | int req_vsel, int *vout_reg, int *gpio_val) | |
124 | { | |
125 | int i; | |
126 | bool found = false; | |
127 | int new_vout_reg = tps->lru_index[MAX8973_MAX_VOUT_REG - 1]; | |
128 | int found_index = MAX8973_MAX_VOUT_REG - 1; | |
129 | ||
130 | for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) { | |
131 | if (tps->curr_vout_val[tps->lru_index[i]] == req_vsel) { | |
132 | new_vout_reg = tps->lru_index[i]; | |
133 | found_index = i; | |
134 | found = true; | |
135 | goto update_lru_index; | |
136 | } | |
137 | } | |
138 | ||
139 | update_lru_index: | |
140 | for (i = found_index; i > 0; i--) | |
141 | tps->lru_index[i] = tps->lru_index[i - 1]; | |
142 | ||
143 | tps->lru_index[0] = new_vout_reg; | |
144 | *gpio_val = new_vout_reg; | |
145 | *vout_reg = MAX8973_VOUT + new_vout_reg; | |
146 | return found; | |
147 | } | |
148 | ||
149 | static int max8973_dcdc_get_voltage_sel(struct regulator_dev *rdev) | |
150 | { | |
151 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
152 | unsigned int data; | |
153 | int ret; | |
154 | ||
155 | ret = regmap_read(max->regmap, max->curr_vout_reg, &data); | |
156 | if (ret < 0) { | |
157 | dev_err(max->dev, "register %d read failed, err = %d\n", | |
158 | max->curr_vout_reg, ret); | |
159 | return ret; | |
160 | } | |
161 | return data & MAX8973_VOUT_MASK; | |
162 | } | |
163 | ||
164 | static int max8973_dcdc_set_voltage_sel(struct regulator_dev *rdev, | |
165 | unsigned vsel) | |
166 | { | |
167 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
168 | int ret; | |
169 | bool found = false; | |
170 | int vout_reg = max->curr_vout_reg; | |
171 | int gpio_val = max->curr_gpio_val; | |
172 | ||
173 | /* | |
174 | * If gpios are available to select the VOUT register then least | |
175 | * recently used register for new configuration. | |
176 | */ | |
177 | if (max->valid_dvs_gpio) | |
178 | found = find_voltage_set_register(max, vsel, | |
179 | &vout_reg, &gpio_val); | |
180 | ||
181 | if (!found) { | |
182 | ret = regmap_update_bits(max->regmap, vout_reg, | |
183 | MAX8973_VOUT_MASK, vsel); | |
184 | if (ret < 0) { | |
185 | dev_err(max->dev, "register %d update failed, err %d\n", | |
186 | vout_reg, ret); | |
187 | return ret; | |
188 | } | |
189 | max->curr_vout_reg = vout_reg; | |
190 | max->curr_vout_val[gpio_val] = vsel; | |
191 | } | |
192 | ||
193 | /* Select proper VOUT register vio gpios */ | |
194 | if (max->valid_dvs_gpio) { | |
195 | gpio_set_value_cansleep(max->dvs_gpio, gpio_val & 0x1); | |
196 | max->curr_gpio_val = gpio_val; | |
197 | } | |
198 | return 0; | |
199 | } | |
200 | ||
201 | static int max8973_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) | |
202 | { | |
203 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
204 | int ret; | |
205 | int pwm; | |
206 | ||
207 | /* Enable force PWM mode in FAST mode only. */ | |
208 | switch (mode) { | |
209 | case REGULATOR_MODE_FAST: | |
210 | pwm = MAX8973_FPWM_EN_M; | |
211 | break; | |
212 | ||
213 | case REGULATOR_MODE_NORMAL: | |
214 | pwm = 0; | |
215 | break; | |
216 | ||
217 | default: | |
218 | return -EINVAL; | |
219 | } | |
220 | ||
221 | ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1, | |
222 | MAX8973_FPWM_EN_M, pwm); | |
223 | if (ret < 0) | |
224 | dev_err(max->dev, "register %d update failed, err %d\n", | |
225 | MAX8973_CONTROL1, ret); | |
226 | return ret; | |
227 | } | |
228 | ||
229 | static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev) | |
230 | { | |
231 | struct max8973_chip *max = rdev_get_drvdata(rdev); | |
232 | unsigned int data; | |
233 | int ret; | |
234 | ||
235 | ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data); | |
236 | if (ret < 0) { | |
237 | dev_err(max->dev, "register %d read failed, err %d\n", | |
238 | MAX8973_CONTROL1, ret); | |
239 | return ret; | |
240 | } | |
241 | return (data & MAX8973_FPWM_EN_M) ? | |
242 | REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL; | |
243 | } | |
244 | ||
db892ff6 | 245 | static const struct regulator_ops max8973_dcdc_ops = { |
5928f538 LD |
246 | .get_voltage_sel = max8973_dcdc_get_voltage_sel, |
247 | .set_voltage_sel = max8973_dcdc_set_voltage_sel, | |
248 | .list_voltage = regulator_list_voltage_linear, | |
249 | .set_mode = max8973_dcdc_set_mode, | |
250 | .get_mode = max8973_dcdc_get_mode, | |
251 | }; | |
252 | ||
3d68dfe3 GKH |
253 | static int max8973_init_dcdc(struct max8973_chip *max, |
254 | struct max8973_regulator_platform_data *pdata) | |
5928f538 LD |
255 | { |
256 | int ret; | |
257 | uint8_t control1 = 0; | |
258 | uint8_t control2 = 0; | |
259 | ||
260 | if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE) | |
261 | control1 |= MAX8973_SNS_ENABLE; | |
262 | ||
263 | if (!(pdata->control_flags & MAX8973_CONTROL_FALLING_SLEW_RATE_ENABLE)) | |
264 | control1 |= MAX8973_NFSR_ENABLE; | |
265 | ||
266 | if (pdata->control_flags & MAX8973_CONTROL_OUTPUT_ACTIVE_DISCH_ENABLE) | |
267 | control1 |= MAX8973_AD_ENABLE; | |
268 | ||
269 | if (pdata->control_flags & MAX8973_CONTROL_BIAS_ENABLE) | |
270 | control1 |= MAX8973_BIAS_ENABLE; | |
271 | ||
272 | if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE) | |
273 | control1 |= MAX8973_FREQSHIFT_9PER; | |
274 | ||
275 | /* Set ramp delay */ | |
276 | if (pdata->reg_init_data && | |
277 | pdata->reg_init_data->constraints.ramp_delay) { | |
278 | if (pdata->reg_init_data->constraints.ramp_delay < 25000) | |
b27032ca | 279 | control1 |= MAX8973_RAMP_12mV_PER_US; |
5928f538 | 280 | else if (pdata->reg_init_data->constraints.ramp_delay < 50000) |
b27032ca | 281 | control1 |= MAX8973_RAMP_25mV_PER_US; |
5928f538 | 282 | else if (pdata->reg_init_data->constraints.ramp_delay < 200000) |
b27032ca | 283 | control1 |= MAX8973_RAMP_50mV_PER_US; |
5928f538 | 284 | else |
b27032ca | 285 | control1 |= MAX8973_RAMP_200mV_PER_US; |
5928f538 | 286 | } else { |
b27032ca | 287 | control1 |= MAX8973_RAMP_12mV_PER_US; |
5928f538 LD |
288 | max->desc.ramp_delay = 12500; |
289 | } | |
290 | ||
291 | if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE)) | |
292 | control2 |= MAX8973_DISCH_ENBABLE; | |
293 | ||
294 | /* Clock advance trip configuration */ | |
295 | switch (pdata->control_flags & MAX8973_CONTROL_CLKADV_TRIP_MASK) { | |
296 | case MAX8973_CONTROL_CLKADV_TRIP_DISABLED: | |
297 | control2 |= MAX8973_CKKADV_TRIP_DISABLE; | |
298 | break; | |
299 | ||
300 | case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US: | |
301 | control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US; | |
302 | break; | |
303 | ||
304 | case MAX8973_CONTROL_CLKADV_TRIP_150mV_PER_US: | |
305 | control2 |= MAX8973_CKKADV_TRIP_150mV_PER_US; | |
306 | break; | |
307 | ||
308 | case MAX8973_CONTROL_CLKADV_TRIP_75mV_PER_US_HIST_DIS: | |
309 | control2 |= MAX8973_CKKADV_TRIP_75mV_PER_US_HIST_DIS; | |
310 | break; | |
311 | } | |
312 | ||
313 | /* Configure inductor value */ | |
314 | switch (pdata->control_flags & MAX8973_CONTROL_INDUCTOR_VALUE_MASK) { | |
315 | case MAX8973_CONTROL_INDUCTOR_VALUE_NOMINAL: | |
316 | control2 |= MAX8973_INDUCTOR_NOMINAL; | |
317 | break; | |
318 | ||
319 | case MAX8973_CONTROL_INDUCTOR_VALUE_MINUS_30_PER: | |
320 | control2 |= MAX8973_INDUCTOR_MIN_30_PER; | |
321 | break; | |
322 | ||
323 | case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_30_PER: | |
324 | control2 |= MAX8973_INDUCTOR_PLUS_30_PER; | |
325 | break; | |
326 | ||
327 | case MAX8973_CONTROL_INDUCTOR_VALUE_PLUS_60_PER: | |
328 | control2 |= MAX8973_INDUCTOR_PLUS_60_PER; | |
329 | break; | |
330 | } | |
331 | ||
332 | ret = regmap_write(max->regmap, MAX8973_CONTROL1, control1); | |
333 | if (ret < 0) { | |
334 | dev_err(max->dev, "register %d write failed, err = %d", | |
335 | MAX8973_CONTROL1, ret); | |
336 | return ret; | |
337 | } | |
338 | ||
339 | ret = regmap_write(max->regmap, MAX8973_CONTROL2, control2); | |
340 | if (ret < 0) { | |
341 | dev_err(max->dev, "register %d write failed, err = %d", | |
342 | MAX8973_CONTROL2, ret); | |
343 | return ret; | |
344 | } | |
345 | ||
346 | /* If external control is enabled then disable EN bit */ | |
347 | if (max->enable_external_control) { | |
348 | ret = regmap_update_bits(max->regmap, MAX8973_VOUT, | |
349 | MAX8973_VOUT_ENABLE, 0); | |
350 | if (ret < 0) | |
351 | dev_err(max->dev, "register %d update failed, err = %d", | |
352 | MAX8973_VOUT, ret); | |
353 | } | |
354 | return ret; | |
355 | } | |
356 | ||
357 | static const struct regmap_config max8973_regmap_config = { | |
358 | .reg_bits = 8, | |
359 | .val_bits = 8, | |
360 | .max_register = MAX8973_CHIPID2, | |
361 | .cache_type = REGCACHE_RBTREE, | |
362 | }; | |
363 | ||
3d68dfe3 GKH |
364 | static int max8973_probe(struct i2c_client *client, |
365 | const struct i2c_device_id *id) | |
5928f538 LD |
366 | { |
367 | struct max8973_regulator_platform_data *pdata; | |
368 | struct regulator_config config = { }; | |
369 | struct regulator_dev *rdev; | |
370 | struct max8973_chip *max; | |
371 | int ret; | |
372 | ||
dff91d0b | 373 | pdata = dev_get_platdata(&client->dev); |
42dc3023 GL |
374 | |
375 | if (!pdata && !client->dev.of_node) { | |
5928f538 LD |
376 | dev_err(&client->dev, "No Platform data"); |
377 | return -EIO; | |
378 | } | |
379 | ||
380 | max = devm_kzalloc(&client->dev, sizeof(*max), GFP_KERNEL); | |
21024dee | 381 | if (!max) |
5928f538 | 382 | return -ENOMEM; |
5928f538 LD |
383 | |
384 | max->regmap = devm_regmap_init_i2c(client, &max8973_regmap_config); | |
385 | if (IS_ERR(max->regmap)) { | |
386 | ret = PTR_ERR(max->regmap); | |
387 | dev_err(&client->dev, "regmap init failed, err %d\n", ret); | |
388 | return ret; | |
389 | } | |
390 | ||
391 | i2c_set_clientdata(client, max); | |
db892ff6 | 392 | max->ops = max8973_dcdc_ops; |
5928f538 LD |
393 | max->dev = &client->dev; |
394 | max->desc.name = id->name; | |
395 | max->desc.id = 0; | |
db892ff6 | 396 | max->desc.ops = &max->ops; |
5928f538 LD |
397 | max->desc.type = REGULATOR_VOLTAGE; |
398 | max->desc.owner = THIS_MODULE; | |
399 | max->desc.min_uV = MAX8973_MIN_VOLATGE; | |
400 | max->desc.uV_step = MAX8973_VOLATGE_STEP; | |
401 | max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE; | |
402 | ||
42dc3023 | 403 | if (!pdata || !pdata->enable_ext_control) { |
5928f538 LD |
404 | max->desc.enable_reg = MAX8973_VOUT; |
405 | max->desc.enable_mask = MAX8973_VOUT_ENABLE; | |
db892ff6 GL |
406 | max->ops.enable = regulator_enable_regmap; |
407 | max->ops.disable = regulator_disable_regmap; | |
408 | max->ops.is_enabled = regulator_is_enabled_regmap; | |
5928f538 LD |
409 | } |
410 | ||
42dc3023 GL |
411 | if (pdata) { |
412 | max->dvs_gpio = pdata->dvs_gpio; | |
413 | max->enable_external_control = pdata->enable_ext_control; | |
414 | max->curr_gpio_val = pdata->dvs_def_state; | |
415 | max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state; | |
416 | } else { | |
417 | max->dvs_gpio = -EINVAL; | |
418 | max->curr_vout_reg = MAX8973_VOUT; | |
419 | } | |
420 | ||
5928f538 | 421 | max->lru_index[0] = max->curr_vout_reg; |
5928f538 LD |
422 | |
423 | if (gpio_is_valid(max->dvs_gpio)) { | |
424 | int gpio_flags; | |
425 | int i; | |
426 | ||
427 | gpio_flags = (pdata->dvs_def_state) ? | |
428 | GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW; | |
429 | ret = devm_gpio_request_one(&client->dev, max->dvs_gpio, | |
430 | gpio_flags, "max8973-dvs"); | |
431 | if (ret) { | |
432 | dev_err(&client->dev, | |
433 | "gpio_request for gpio %d failed, err = %d\n", | |
434 | max->dvs_gpio, ret); | |
435 | return ret; | |
436 | } | |
437 | max->valid_dvs_gpio = true; | |
438 | ||
439 | /* | |
440 | * Initialize the lru index with vout_reg id | |
441 | * The index 0 will be most recently used and | |
442 | * set with the max->curr_vout_reg */ | |
443 | for (i = 0; i < MAX8973_MAX_VOUT_REG; ++i) | |
444 | max->lru_index[i] = i; | |
445 | max->lru_index[0] = max->curr_vout_reg; | |
446 | max->lru_index[max->curr_vout_reg] = 0; | |
42dc3023 GL |
447 | } else { |
448 | max->valid_dvs_gpio = false; | |
5928f538 LD |
449 | } |
450 | ||
42dc3023 GL |
451 | if (pdata) { |
452 | ret = max8973_init_dcdc(max, pdata); | |
453 | if (ret < 0) { | |
454 | dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret); | |
455 | return ret; | |
456 | } | |
5928f538 LD |
457 | } |
458 | ||
459 | config.dev = &client->dev; | |
42dc3023 GL |
460 | config.init_data = pdata ? pdata->reg_init_data : |
461 | of_get_regulator_init_data(&client->dev, client->dev.of_node); | |
5928f538 LD |
462 | config.driver_data = max; |
463 | config.of_node = client->dev.of_node; | |
464 | config.regmap = max->regmap; | |
465 | ||
466 | /* Register the regulators */ | |
8d581fd0 | 467 | rdev = devm_regulator_register(&client->dev, &max->desc, &config); |
5928f538 LD |
468 | if (IS_ERR(rdev)) { |
469 | ret = PTR_ERR(rdev); | |
470 | dev_err(max->dev, "regulator register failed, err %d\n", ret); | |
471 | return ret; | |
472 | } | |
473 | ||
5928f538 LD |
474 | return 0; |
475 | } | |
476 | ||
5928f538 LD |
477 | static const struct i2c_device_id max8973_id[] = { |
478 | {.name = "max8973",}, | |
479 | {}, | |
480 | }; | |
481 | ||
482 | MODULE_DEVICE_TABLE(i2c, max8973_id); | |
483 | ||
484 | static struct i2c_driver max8973_i2c_driver = { | |
485 | .driver = { | |
486 | .name = "max8973", | |
487 | .owner = THIS_MODULE, | |
488 | }, | |
489 | .probe = max8973_probe, | |
5928f538 LD |
490 | .id_table = max8973_id, |
491 | }; | |
492 | ||
493 | static int __init max8973_init(void) | |
494 | { | |
495 | return i2c_add_driver(&max8973_i2c_driver); | |
496 | } | |
497 | subsys_initcall(max8973_init); | |
498 | ||
499 | static void __exit max8973_cleanup(void) | |
500 | { | |
501 | i2c_del_driver(&max8973_i2c_driver); | |
502 | } | |
503 | module_exit(max8973_cleanup); | |
504 | ||
505 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); | |
506 | MODULE_DESCRIPTION("MAX8973 voltage regulator driver"); | |
507 | MODULE_LICENSE("GPL v2"); |