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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / mfd / menelaus.c
blobad25bfa3fb02cf76ee6c1afcbe3cd8fcecbd49e5
1 /*
2 * Copyright (C) 2004 Texas Instruments, Inc.
3 *
4 * Some parts based tps65010.c:
5 * Copyright (C) 2004 Texas Instruments and
6 * Copyright (C) 2004-2005 David Brownell
7 *
8 * Some parts based on tlv320aic24.c:
9 * Copyright (C) by Kai Svahn <kai.svahn@nokia.com>
10 *
11 * Changes for interrupt handling and clean-up by
12 * Tony Lindgren <tony@atomide.com> and Imre Deak <imre.deak@nokia.com>
13 * Cleanup and generalized support for voltage setting by
14 * Juha Yrjola
15 * Added support for controlling VCORE and regulator sleep states,
16 * Amit Kucheria <amit.kucheria@nokia.com>
17 * Copyright (C) 2005, 2006 Nokia Corporation
18 *
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 */
33
34 #include <linux/module.h>
35 #include <linux/i2c.h>
36 #include <linux/interrupt.h>
37 #include <linux/sched.h>
38 #include <linux/mutex.h>
39 #include <linux/workqueue.h>
40 #include <linux/delay.h>
41 #include <linux/rtc.h>
42 #include <linux/bcd.h>
43 #include <linux/slab.h>
44 #include <linux/mfd/menelaus.h>
45
46 #include <asm/mach/irq.h>
47
48 #include <asm/gpio.h>
49
50 #define DRIVER_NAME "menelaus"
51
52 #define MENELAUS_I2C_ADDRESS 0x72
53
54 #define MENELAUS_REV 0x01
55 #define MENELAUS_VCORE_CTRL1 0x02
56 #define MENELAUS_VCORE_CTRL2 0x03
57 #define MENELAUS_VCORE_CTRL3 0x04
58 #define MENELAUS_VCORE_CTRL4 0x05
59 #define MENELAUS_VCORE_CTRL5 0x06
60 #define MENELAUS_DCDC_CTRL1 0x07
61 #define MENELAUS_DCDC_CTRL2 0x08
62 #define MENELAUS_DCDC_CTRL3 0x09
63 #define MENELAUS_LDO_CTRL1 0x0A
64 #define MENELAUS_LDO_CTRL2 0x0B
65 #define MENELAUS_LDO_CTRL3 0x0C
66 #define MENELAUS_LDO_CTRL4 0x0D
67 #define MENELAUS_LDO_CTRL5 0x0E
68 #define MENELAUS_LDO_CTRL6 0x0F
69 #define MENELAUS_LDO_CTRL7 0x10
70 #define MENELAUS_LDO_CTRL8 0x11
71 #define MENELAUS_SLEEP_CTRL1 0x12
72 #define MENELAUS_SLEEP_CTRL2 0x13
73 #define MENELAUS_DEVICE_OFF 0x14
74 #define MENELAUS_OSC_CTRL 0x15
75 #define MENELAUS_DETECT_CTRL 0x16
76 #define MENELAUS_INT_MASK1 0x17
77 #define MENELAUS_INT_MASK2 0x18
78 #define MENELAUS_INT_STATUS1 0x19
79 #define MENELAUS_INT_STATUS2 0x1A
80 #define MENELAUS_INT_ACK1 0x1B
81 #define MENELAUS_INT_ACK2 0x1C
82 #define MENELAUS_GPIO_CTRL 0x1D
83 #define MENELAUS_GPIO_IN 0x1E
84 #define MENELAUS_GPIO_OUT 0x1F
85 #define MENELAUS_BBSMS 0x20
86 #define MENELAUS_RTC_CTRL 0x21
87 #define MENELAUS_RTC_UPDATE 0x22
88 #define MENELAUS_RTC_SEC 0x23
89 #define MENELAUS_RTC_MIN 0x24
90 #define MENELAUS_RTC_HR 0x25
91 #define MENELAUS_RTC_DAY 0x26
92 #define MENELAUS_RTC_MON 0x27
93 #define MENELAUS_RTC_YR 0x28
94 #define MENELAUS_RTC_WKDAY 0x29
95 #define MENELAUS_RTC_AL_SEC 0x2A
96 #define MENELAUS_RTC_AL_MIN 0x2B
97 #define MENELAUS_RTC_AL_HR 0x2C
98 #define MENELAUS_RTC_AL_DAY 0x2D
99 #define MENELAUS_RTC_AL_MON 0x2E
100 #define MENELAUS_RTC_AL_YR 0x2F
101 #define MENELAUS_RTC_COMP_MSB 0x30
102 #define MENELAUS_RTC_COMP_LSB 0x31
103 #define MENELAUS_S1_PULL_EN 0x32
104 #define MENELAUS_S1_PULL_DIR 0x33
105 #define MENELAUS_S2_PULL_EN 0x34
106 #define MENELAUS_S2_PULL_DIR 0x35
107 #define MENELAUS_MCT_CTRL1 0x36
108 #define MENELAUS_MCT_CTRL2 0x37
109 #define MENELAUS_MCT_CTRL3 0x38
110 #define MENELAUS_MCT_PIN_ST 0x39
111 #define MENELAUS_DEBOUNCE1 0x3A
112
113 #define IH_MENELAUS_IRQS 12
114 #define MENELAUS_MMC_S1CD_IRQ 0 /* MMC slot 1 card change */
115 #define MENELAUS_MMC_S2CD_IRQ 1 /* MMC slot 2 card change */
116 #define MENELAUS_MMC_S1D1_IRQ 2 /* MMC DAT1 low in slot 1 */
117 #define MENELAUS_MMC_S2D1_IRQ 3 /* MMC DAT1 low in slot 2 */
118 #define MENELAUS_LOWBAT_IRQ 4 /* Low battery */
119 #define MENELAUS_HOTDIE_IRQ 5 /* Hot die detect */
120 #define MENELAUS_UVLO_IRQ 6 /* UVLO detect */
121 #define MENELAUS_TSHUT_IRQ 7 /* Thermal shutdown */
122 #define MENELAUS_RTCTMR_IRQ 8 /* RTC timer */
123 #define MENELAUS_RTCALM_IRQ 9 /* RTC alarm */
124 #define MENELAUS_RTCERR_IRQ 10 /* RTC error */
125 #define MENELAUS_PSHBTN_IRQ 11 /* Push button */
126 #define MENELAUS_RESERVED12_IRQ 12 /* Reserved */
127 #define MENELAUS_RESERVED13_IRQ 13 /* Reserved */
128 #define MENELAUS_RESERVED14_IRQ 14 /* Reserved */
129 #define MENELAUS_RESERVED15_IRQ 15 /* Reserved */
130
131 /* VCORE_CTRL1 register */
132 #define VCORE_CTRL1_BYP_COMP (1 << 5)
133 #define VCORE_CTRL1_HW_NSW (1 << 7)
134
135 /* GPIO_CTRL register */
136 #define GPIO_CTRL_SLOTSELEN (1 << 5)
137 #define GPIO_CTRL_SLPCTLEN (1 << 6)
138 #define GPIO1_DIR_INPUT (1 << 0)
139 #define GPIO2_DIR_INPUT (1 << 1)
140 #define GPIO3_DIR_INPUT (1 << 2)
141
142 /* MCT_CTRL1 register */
143 #define MCT_CTRL1_S1_CMD_OD (1 << 2)
144 #define MCT_CTRL1_S2_CMD_OD (1 << 3)
145
146 /* MCT_CTRL2 register */
147 #define MCT_CTRL2_VS2_SEL_D0 (1 << 0)
148 #define MCT_CTRL2_VS2_SEL_D1 (1 << 1)
149 #define MCT_CTRL2_S1CD_BUFEN (1 << 4)
150 #define MCT_CTRL2_S2CD_BUFEN (1 << 5)
151 #define MCT_CTRL2_S1CD_DBEN (1 << 6)
152 #define MCT_CTRL2_S2CD_BEN (1 << 7)
153
154 /* MCT_CTRL3 register */
155 #define MCT_CTRL3_SLOT1_EN (1 << 0)
156 #define MCT_CTRL3_SLOT2_EN (1 << 1)
157 #define MCT_CTRL3_S1_AUTO_EN (1 << 2)
158 #define MCT_CTRL3_S2_AUTO_EN (1 << 3)
159
160 /* MCT_PIN_ST register */
161 #define MCT_PIN_ST_S1_CD_ST (1 << 0)
162 #define MCT_PIN_ST_S2_CD_ST (1 << 1)
163
164 static void menelaus_work(struct work_struct *_menelaus);
165
166 struct menelaus_chip {
167 struct mutex lock;
168 struct i2c_client *client;
169 struct work_struct work;
170 #ifdef CONFIG_RTC_DRV_TWL92330
171 struct rtc_device *rtc;
172 u8 rtc_control;
173 unsigned uie:1;
174 #endif
175 unsigned vcore_hw_mode:1;
176 u8 mask1, mask2;
177 void (*handlers[16])(struct menelaus_chip *);
178 void (*mmc_callback)(void *data, u8 mask);
179 void *mmc_callback_data;
180 };
181
182 static struct menelaus_chip *the_menelaus;
183
184 static int menelaus_write_reg(int reg, u8 value)
185 {
186 int val = i2c_smbus_write_byte_data(the_menelaus->client, reg, value);
187
188 if (val < 0) {
189 pr_err(DRIVER_NAME ": write error");
190 return val;
191 }
192
193 return 0;
194 }
195
196 static int menelaus_read_reg(int reg)
197 {
198 int val = i2c_smbus_read_byte_data(the_menelaus->client, reg);
199
200 if (val < 0)
201 pr_err(DRIVER_NAME ": read error");
202
203 return val;
204 }
205
206 static int menelaus_enable_irq(int irq)
207 {
208 if (irq > 7) {
209 irq -= 8;
210 the_menelaus->mask2 &= ~(1 << irq);
211 return menelaus_write_reg(MENELAUS_INT_MASK2,
212 the_menelaus->mask2);
213 } else {
214 the_menelaus->mask1 &= ~(1 << irq);
215 return menelaus_write_reg(MENELAUS_INT_MASK1,
216 the_menelaus->mask1);
217 }
218 }
219
220 static int menelaus_disable_irq(int irq)
221 {
222 if (irq > 7) {
223 irq -= 8;
224 the_menelaus->mask2 |= (1 << irq);
225 return menelaus_write_reg(MENELAUS_INT_MASK2,
226 the_menelaus->mask2);
227 } else {
228 the_menelaus->mask1 |= (1 << irq);
229 return menelaus_write_reg(MENELAUS_INT_MASK1,
230 the_menelaus->mask1);
231 }
232 }
233
234 static int menelaus_ack_irq(int irq)
235 {
236 if (irq > 7)
237 return menelaus_write_reg(MENELAUS_INT_ACK2, 1 << (irq - 8));
238 else
239 return menelaus_write_reg(MENELAUS_INT_ACK1, 1 << irq);
240 }
241
242 /* Adds a handler for an interrupt. Does not run in interrupt context */
243 static int menelaus_add_irq_work(int irq,
244 void (*handler)(struct menelaus_chip *))
245 {
246 int ret = 0;
247
248 mutex_lock(&the_menelaus->lock);
249 the_menelaus->handlers[irq] = handler;
250 ret = menelaus_enable_irq(irq);
251 mutex_unlock(&the_menelaus->lock);
252
253 return ret;
254 }
255
256 /* Removes handler for an interrupt */
257 static int menelaus_remove_irq_work(int irq)
258 {
259 int ret = 0;
260
261 mutex_lock(&the_menelaus->lock);
262 ret = menelaus_disable_irq(irq);
263 the_menelaus->handlers[irq] = NULL;
264 mutex_unlock(&the_menelaus->lock);
265
266 return ret;
267 }
268
269 /*
270 * Gets scheduled when a card detect interrupt happens. Note that in some cases
271 * this line is wired to card cover switch rather than the card detect switch
272 * in each slot. In this case the cards are not seen by menelaus.
273 * FIXME: Add handling for D1 too
274 */
275 static void menelaus_mmc_cd_work(struct menelaus_chip *menelaus_hw)
276 {
277 int reg;
278 unsigned char card_mask = 0;
279
280 reg = menelaus_read_reg(MENELAUS_MCT_PIN_ST);
281 if (reg < 0)
282 return;
283
284 if (!(reg & 0x1))
285 card_mask |= MCT_PIN_ST_S1_CD_ST;
286
287 if (!(reg & 0x2))
288 card_mask |= MCT_PIN_ST_S2_CD_ST;
289
290 if (menelaus_hw->mmc_callback)
291 menelaus_hw->mmc_callback(menelaus_hw->mmc_callback_data,
292 card_mask);
293 }
294
295 /*
296 * Toggles the MMC slots between open-drain and push-pull mode.
297 */
298 int menelaus_set_mmc_opendrain(int slot, int enable)
299 {
300 int ret, val;
301
302 if (slot != 1 && slot != 2)
303 return -EINVAL;
304 mutex_lock(&the_menelaus->lock);
305 ret = menelaus_read_reg(MENELAUS_MCT_CTRL1);
306 if (ret < 0) {
307 mutex_unlock(&the_menelaus->lock);
308 return ret;
309 }
310 val = ret;
311 if (slot == 1) {
312 if (enable)
313 val |= MCT_CTRL1_S1_CMD_OD;
314 else
315 val &= ~MCT_CTRL1_S1_CMD_OD;
316 } else {
317 if (enable)
318 val |= MCT_CTRL1_S2_CMD_OD;
319 else
320 val &= ~MCT_CTRL1_S2_CMD_OD;
321 }
322 ret = menelaus_write_reg(MENELAUS_MCT_CTRL1, val);
323 mutex_unlock(&the_menelaus->lock);
324
325 return ret;
326 }
327 EXPORT_SYMBOL(menelaus_set_mmc_opendrain);
328
329 int menelaus_set_slot_sel(int enable)
330 {
331 int ret;
332
333 mutex_lock(&the_menelaus->lock);
334 ret = menelaus_read_reg(MENELAUS_GPIO_CTRL);
335 if (ret < 0)
336 goto out;
337 ret |= GPIO2_DIR_INPUT;
338 if (enable)
339 ret |= GPIO_CTRL_SLOTSELEN;
340 else
341 ret &= ~GPIO_CTRL_SLOTSELEN;
342 ret = menelaus_write_reg(MENELAUS_GPIO_CTRL, ret);
343 out:
344 mutex_unlock(&the_menelaus->lock);
345 return ret;
346 }
347 EXPORT_SYMBOL(menelaus_set_slot_sel);
348
349 int menelaus_set_mmc_slot(int slot, int enable, int power, int cd_en)
350 {
351 int ret, val;
352
353 if (slot != 1 && slot != 2)
354 return -EINVAL;
355 if (power >= 3)
356 return -EINVAL;
357
358 mutex_lock(&the_menelaus->lock);
359
360 ret = menelaus_read_reg(MENELAUS_MCT_CTRL2);
361 if (ret < 0)
362 goto out;
363 val = ret;
364 if (slot == 1) {
365 if (cd_en)
366 val |= MCT_CTRL2_S1CD_BUFEN | MCT_CTRL2_S1CD_DBEN;
367 else
368 val &= ~(MCT_CTRL2_S1CD_BUFEN | MCT_CTRL2_S1CD_DBEN);
369 } else {
370 if (cd_en)
371 val |= MCT_CTRL2_S2CD_BUFEN | MCT_CTRL2_S2CD_BEN;
372 else
373 val &= ~(MCT_CTRL2_S2CD_BUFEN | MCT_CTRL2_S2CD_BEN);
374 }
375 ret = menelaus_write_reg(MENELAUS_MCT_CTRL2, val);
376 if (ret < 0)
377 goto out;
378
379 ret = menelaus_read_reg(MENELAUS_MCT_CTRL3);
380 if (ret < 0)
381 goto out;
382 val = ret;
383 if (slot == 1) {
384 if (enable)
385 val |= MCT_CTRL3_SLOT1_EN;
386 else
387 val &= ~MCT_CTRL3_SLOT1_EN;
388 } else {
389 int b;
390
391 if (enable)
392 val |= MCT_CTRL3_SLOT2_EN;
393 else
394 val &= ~MCT_CTRL3_SLOT2_EN;
395 b = menelaus_read_reg(MENELAUS_MCT_CTRL2);
396 b &= ~(MCT_CTRL2_VS2_SEL_D0 | MCT_CTRL2_VS2_SEL_D1);
397 b |= power;
398 ret = menelaus_write_reg(MENELAUS_MCT_CTRL2, b);
399 if (ret < 0)
400 goto out;
401 }
402 /* Disable autonomous shutdown */
403 val &= ~(MCT_CTRL3_S1_AUTO_EN | MCT_CTRL3_S2_AUTO_EN);
404 ret = menelaus_write_reg(MENELAUS_MCT_CTRL3, val);
405 out:
406 mutex_unlock(&the_menelaus->lock);
407 return ret;
408 }
409 EXPORT_SYMBOL(menelaus_set_mmc_slot);
410
411 int menelaus_register_mmc_callback(void (*callback)(void *data, u8 card_mask),
412 void *data)
413 {
414 int ret = 0;
415
416 the_menelaus->mmc_callback_data = data;
417 the_menelaus->mmc_callback = callback;
418 ret = menelaus_add_irq_work(MENELAUS_MMC_S1CD_IRQ,
419 menelaus_mmc_cd_work);
420 if (ret < 0)
421 return ret;
422 ret = menelaus_add_irq_work(MENELAUS_MMC_S2CD_IRQ,
423 menelaus_mmc_cd_work);
424 if (ret < 0)
425 return ret;
426 ret = menelaus_add_irq_work(MENELAUS_MMC_S1D1_IRQ,
427 menelaus_mmc_cd_work);
428 if (ret < 0)
429 return ret;
430 ret = menelaus_add_irq_work(MENELAUS_MMC_S2D1_IRQ,
431 menelaus_mmc_cd_work);
432
433 return ret;
434 }
435 EXPORT_SYMBOL(menelaus_register_mmc_callback);
436
437 void menelaus_unregister_mmc_callback(void)
438 {
439 menelaus_remove_irq_work(MENELAUS_MMC_S1CD_IRQ);
440 menelaus_remove_irq_work(MENELAUS_MMC_S2CD_IRQ);
441 menelaus_remove_irq_work(MENELAUS_MMC_S1D1_IRQ);
442 menelaus_remove_irq_work(MENELAUS_MMC_S2D1_IRQ);
443
444 the_menelaus->mmc_callback = NULL;
445 the_menelaus->mmc_callback_data = NULL;
446 }
447 EXPORT_SYMBOL(menelaus_unregister_mmc_callback);
448
449 struct menelaus_vtg {
450 const char *name;
451 u8 vtg_reg;
452 u8 vtg_shift;
453 u8 vtg_bits;
454 u8 mode_reg;
455 };
456
457 struct menelaus_vtg_value {
458 u16 vtg;
459 u16 val;
460 };
461
462 static int menelaus_set_voltage(const struct menelaus_vtg *vtg, int mV,
463 int vtg_val, int mode)
464 {
465 int val, ret;
466 struct i2c_client *c = the_menelaus->client;
467
468 mutex_lock(&the_menelaus->lock);
469 if (!vtg)
470 goto set_voltage;
471
472 ret = menelaus_read_reg(vtg->vtg_reg);
473 if (ret < 0)
474 goto out;
475 val = ret & ~(((1 << vtg->vtg_bits) - 1) << vtg->vtg_shift);
476 val |= vtg_val << vtg->vtg_shift;
477
478 dev_dbg(&c->dev, "Setting voltage '%s'"
479 "to %d mV (reg 0x%02x, val 0x%02x)\n",
480 vtg->name, mV, vtg->vtg_reg, val);
481
482 ret = menelaus_write_reg(vtg->vtg_reg, val);
483 if (ret < 0)
484 goto out;
485 set_voltage:
486 ret = menelaus_write_reg(vtg->mode_reg, mode);
487 out:
488 mutex_unlock(&the_menelaus->lock);
489 if (ret == 0) {
490 /* Wait for voltage to stabilize */
491 msleep(1);
492 }
493 return ret;
494 }
495
496 static int menelaus_get_vtg_value(int vtg, const struct menelaus_vtg_value *tbl,
497 int n)
498 {
499 int i;
500
501 for (i = 0; i < n; i++, tbl++)
502 if (tbl->vtg == vtg)
503 return tbl->val;
504 return -EINVAL;
505 }
506
507 /*
508 * Vcore can be programmed in two ways:
509 * SW-controlled: Required voltage is programmed into VCORE_CTRL1
510 * HW-controlled: Required range (roof-floor) is programmed into VCORE_CTRL3
511 * and VCORE_CTRL4
512 *
513 * Call correct 'set' function accordingly
514 */
515
516 static const struct menelaus_vtg_value vcore_values[] = {
517 { 1000, 0 },
518 { 1025, 1 },
519 { 1050, 2 },
520 { 1075, 3 },
521 { 1100, 4 },
522 { 1125, 5 },
523 { 1150, 6 },
524 { 1175, 7 },
525 { 1200, 8 },
526 { 1225, 9 },
527 { 1250, 10 },
528 { 1275, 11 },
529 { 1300, 12 },
530 { 1325, 13 },
531 { 1350, 14 },
532 { 1375, 15 },
533 { 1400, 16 },
534 { 1425, 17 },
535 { 1450, 18 },
536 };
537
538 int menelaus_set_vcore_sw(unsigned int mV)
539 {
540 int val, ret;
541 struct i2c_client *c = the_menelaus->client;
542
543 val = menelaus_get_vtg_value(mV, vcore_values,
544 ARRAY_SIZE(vcore_values));
545 if (val < 0)
546 return -EINVAL;
547
548 dev_dbg(&c->dev, "Setting VCORE to %d mV (val 0x%02x)\n", mV, val);
549
550 /* Set SW mode and the voltage in one go. */
551 mutex_lock(&the_menelaus->lock);
552 ret = menelaus_write_reg(MENELAUS_VCORE_CTRL1, val);
553 if (ret == 0)
554 the_menelaus->vcore_hw_mode = 0;
555 mutex_unlock(&the_menelaus->lock);
556 msleep(1);
557
558 return ret;
559 }
560
561 int menelaus_set_vcore_hw(unsigned int roof_mV, unsigned int floor_mV)
562 {
563 int fval, rval, val, ret;
564 struct i2c_client *c = the_menelaus->client;
565
566 rval = menelaus_get_vtg_value(roof_mV, vcore_values,
567 ARRAY_SIZE(vcore_values));
568 if (rval < 0)
569 return -EINVAL;
570 fval = menelaus_get_vtg_value(floor_mV, vcore_values,
571 ARRAY_SIZE(vcore_values));
572 if (fval < 0)
573 return -EINVAL;
574
575 dev_dbg(&c->dev, "Setting VCORE FLOOR to %d mV and ROOF to %d mV\n",
576 floor_mV, roof_mV);
577
578 mutex_lock(&the_menelaus->lock);
579 ret = menelaus_write_reg(MENELAUS_VCORE_CTRL3, fval);
580 if (ret < 0)
581 goto out;
582 ret = menelaus_write_reg(MENELAUS_VCORE_CTRL4, rval);
583 if (ret < 0)
584 goto out;
585 if (!the_menelaus->vcore_hw_mode) {
586 val = menelaus_read_reg(MENELAUS_VCORE_CTRL1);
587 /* HW mode, turn OFF byte comparator */
588 val |= (VCORE_CTRL1_HW_NSW | VCORE_CTRL1_BYP_COMP);
589 ret = menelaus_write_reg(MENELAUS_VCORE_CTRL1, val);
590 the_menelaus->vcore_hw_mode = 1;
591 }
592 msleep(1);
593 out:
594 mutex_unlock(&the_menelaus->lock);
595 return ret;
596 }
597
598 static const struct menelaus_vtg vmem_vtg = {
599 .name = "VMEM",
600 .vtg_reg = MENELAUS_LDO_CTRL1,
601 .vtg_shift = 0,
602 .vtg_bits = 2,
603 .mode_reg = MENELAUS_LDO_CTRL3,
604 };
605
606 static const struct menelaus_vtg_value vmem_values[] = {
607 { 1500, 0 },
608 { 1800, 1 },
609 { 1900, 2 },
610 { 2500, 3 },
611 };
612
613 int menelaus_set_vmem(unsigned int mV)
614 {
615 int val;
616
617 if (mV == 0)
618 return menelaus_set_voltage(&vmem_vtg, 0, 0, 0);
619
620 val = menelaus_get_vtg_value(mV, vmem_values, ARRAY_SIZE(vmem_values));
621 if (val < 0)
622 return -EINVAL;
623 return menelaus_set_voltage(&vmem_vtg, mV, val, 0x02);
624 }
625 EXPORT_SYMBOL(menelaus_set_vmem);
626
627 static const struct menelaus_vtg vio_vtg = {
628 .name = "VIO",
629 .vtg_reg = MENELAUS_LDO_CTRL1,
630 .vtg_shift = 2,
631 .vtg_bits = 2,
632 .mode_reg = MENELAUS_LDO_CTRL4,
633 };
634
635 static const struct menelaus_vtg_value vio_values[] = {
636 { 1500, 0 },
637 { 1800, 1 },
638 { 2500, 2 },
639 { 2800, 3 },
640 };
641
642 int menelaus_set_vio(unsigned int mV)
643 {
644 int val;
645
646 if (mV == 0)
647 return menelaus_set_voltage(&vio_vtg, 0, 0, 0);
648
649 val = menelaus_get_vtg_value(mV, vio_values, ARRAY_SIZE(vio_values));
650 if (val < 0)
651 return -EINVAL;
652 return menelaus_set_voltage(&vio_vtg, mV, val, 0x02);
653 }
654 EXPORT_SYMBOL(menelaus_set_vio);
655
656 static const struct menelaus_vtg_value vdcdc_values[] = {
657 { 1500, 0 },
658 { 1800, 1 },
659 { 2000, 2 },
660 { 2200, 3 },
661 { 2400, 4 },
662 { 2800, 5 },
663 { 3000, 6 },
664 { 3300, 7 },
665 };
666
667 static const struct menelaus_vtg vdcdc2_vtg = {
668 .name = "VDCDC2",
669 .vtg_reg = MENELAUS_DCDC_CTRL1,
670 .vtg_shift = 0,
671 .vtg_bits = 3,
672 .mode_reg = MENELAUS_DCDC_CTRL2,
673 };
674
675 static const struct menelaus_vtg vdcdc3_vtg = {
676 .name = "VDCDC3",
677 .vtg_reg = MENELAUS_DCDC_CTRL1,
678 .vtg_shift = 3,
679 .vtg_bits = 3,
680 .mode_reg = MENELAUS_DCDC_CTRL3,
681 };
682
683 int menelaus_set_vdcdc(int dcdc, unsigned int mV)
684 {
685 const struct menelaus_vtg *vtg;
686 int val;
687
688 if (dcdc != 2 && dcdc != 3)
689 return -EINVAL;
690 if (dcdc == 2)
691 vtg = &vdcdc2_vtg;
692 else
693 vtg = &vdcdc3_vtg;
694
695 if (mV == 0)
696 return menelaus_set_voltage(vtg, 0, 0, 0);
697
698 val = menelaus_get_vtg_value(mV, vdcdc_values,
699 ARRAY_SIZE(vdcdc_values));
700 if (val < 0)
701 return -EINVAL;
702 return menelaus_set_voltage(vtg, mV, val, 0x03);
703 }
704
705 static const struct menelaus_vtg_value vmmc_values[] = {
706 { 1850, 0 },
707 { 2800, 1 },
708 { 3000, 2 },
709 { 3100, 3 },
710 };
711
712 static const struct menelaus_vtg vmmc_vtg = {
713 .name = "VMMC",
714 .vtg_reg = MENELAUS_LDO_CTRL1,
715 .vtg_shift = 6,
716 .vtg_bits = 2,
717 .mode_reg = MENELAUS_LDO_CTRL7,
718 };
719
720 int menelaus_set_vmmc(unsigned int mV)
721 {
722 int val;
723
724 if (mV == 0)
725 return menelaus_set_voltage(&vmmc_vtg, 0, 0, 0);
726
727 val = menelaus_get_vtg_value(mV, vmmc_values, ARRAY_SIZE(vmmc_values));
728 if (val < 0)
729 return -EINVAL;
730 return menelaus_set_voltage(&vmmc_vtg, mV, val, 0x02);
731 }
732 EXPORT_SYMBOL(menelaus_set_vmmc);
733
734
735 static const struct menelaus_vtg_value vaux_values[] = {
736 { 1500, 0 },
737 { 1800, 1 },
738 { 2500, 2 },
739 { 2800, 3 },
740 };
741
742 static const struct menelaus_vtg vaux_vtg = {
743 .name = "VAUX",
744 .vtg_reg = MENELAUS_LDO_CTRL1,
745 .vtg_shift = 4,
746 .vtg_bits = 2,
747 .mode_reg = MENELAUS_LDO_CTRL6,
748 };
749
750 int menelaus_set_vaux(unsigned int mV)
751 {
752 int val;
753
754 if (mV == 0)
755 return menelaus_set_voltage(&vaux_vtg, 0, 0, 0);
756
757 val = menelaus_get_vtg_value(mV, vaux_values, ARRAY_SIZE(vaux_values));
758 if (val < 0)
759 return -EINVAL;
760 return menelaus_set_voltage(&vaux_vtg, mV, val, 0x02);
761 }
762 EXPORT_SYMBOL(menelaus_set_vaux);
763
764 int menelaus_get_slot_pin_states(void)
765 {
766 return menelaus_read_reg(MENELAUS_MCT_PIN_ST);
767 }
768 EXPORT_SYMBOL(menelaus_get_slot_pin_states);
769
770 int menelaus_set_regulator_sleep(int enable, u32 val)
771 {
772 int t, ret;
773 struct i2c_client *c = the_menelaus->client;
774
775 mutex_lock(&the_menelaus->lock);
776 ret = menelaus_write_reg(MENELAUS_SLEEP_CTRL2, val);
777 if (ret < 0)
778 goto out;
779
780 dev_dbg(&c->dev, "regulator sleep configuration: %02x\n", val);
781
782 ret = menelaus_read_reg(MENELAUS_GPIO_CTRL);
783 if (ret < 0)
784 goto out;
785 t = (GPIO_CTRL_SLPCTLEN | GPIO3_DIR_INPUT);
786 if (enable)
787 ret |= t;
788 else
789 ret &= ~t;
790 ret = menelaus_write_reg(MENELAUS_GPIO_CTRL, ret);
791 out:
792 mutex_unlock(&the_menelaus->lock);
793 return ret;
794 }
795
796 /*-----------------------------------------------------------------------*/
797
798 /* Handles Menelaus interrupts. Does not run in interrupt context */
799 static void menelaus_work(struct work_struct *_menelaus)
800 {
801 struct menelaus_chip *menelaus =
802 container_of(_menelaus, struct menelaus_chip, work);
803 void (*handler)(struct menelaus_chip *menelaus);
804
805 while (1) {
806 unsigned isr;
807
808 isr = (menelaus_read_reg(MENELAUS_INT_STATUS2)
809 & ~menelaus->mask2) << 8;
810 isr |= menelaus_read_reg(MENELAUS_INT_STATUS1)
811 & ~menelaus->mask1;
812 if (!isr)
813 break;
814
815 while (isr) {
816 int irq = fls(isr) - 1;
817 isr &= ~(1 << irq);
818
819 mutex_lock(&menelaus->lock);
820 menelaus_disable_irq(irq);
821 menelaus_ack_irq(irq);
822 handler = menelaus->handlers[irq];
823 if (handler)
824 handler(menelaus);
825 menelaus_enable_irq(irq);
826 mutex_unlock(&menelaus->lock);
827 }
828 }
829 enable_irq(menelaus->client->irq);
830 }
831
832 /*
833 * We cannot use I2C in interrupt context, so we just schedule work.
834 */
835 static irqreturn_t menelaus_irq(int irq, void *_menelaus)
836 {
837 struct menelaus_chip *menelaus = _menelaus;
838
839 disable_irq_nosync(irq);
840 (void)schedule_work(&menelaus->work);
841
842 return IRQ_HANDLED;
843 }
844
845 /*-----------------------------------------------------------------------*/
846
847 /*
848 * The RTC needs to be set once, then it runs on backup battery power.
849 * It supports alarms, including system wake alarms (from some modes);
850 * and 1/second IRQs if requested.
851 */
852 #ifdef CONFIG_RTC_DRV_TWL92330
853
854 #define RTC_CTRL_RTC_EN (1 << 0)
855 #define RTC_CTRL_AL_EN (1 << 1)
856 #define RTC_CTRL_MODE12 (1 << 2)
857 #define RTC_CTRL_EVERY_MASK (3 << 3)
858 #define RTC_CTRL_EVERY_SEC (0 << 3)
859 #define RTC_CTRL_EVERY_MIN (1 << 3)
860 #define RTC_CTRL_EVERY_HR (2 << 3)
861 #define RTC_CTRL_EVERY_DAY (3 << 3)
862
863 #define RTC_UPDATE_EVERY 0x08
864
865 #define RTC_HR_PM (1 << 7)
866
867 static void menelaus_to_time(char *regs, struct rtc_time *t)
868 {
869 t->tm_sec = bcd2bin(regs[0]);
870 t->tm_min = bcd2bin(regs[1]);
871 if (the_menelaus->rtc_control & RTC_CTRL_MODE12) {
872 t->tm_hour = bcd2bin(regs[2] & 0x1f) - 1;
873 if (regs[2] & RTC_HR_PM)
874 t->tm_hour += 12;
875 } else
876 t->tm_hour = bcd2bin(regs[2] & 0x3f);
877 t->tm_mday = bcd2bin(regs[3]);
878 t->tm_mon = bcd2bin(regs[4]) - 1;
879 t->tm_year = bcd2bin(regs[5]) + 100;
880 }
881
882 static int time_to_menelaus(struct rtc_time *t, int regnum)
883 {
884 int hour, status;
885
886 status = menelaus_write_reg(regnum++, bin2bcd(t->tm_sec));
887 if (status < 0)
888 goto fail;
889
890 status = menelaus_write_reg(regnum++, bin2bcd(t->tm_min));
891 if (status < 0)
892 goto fail;
893
894 if (the_menelaus->rtc_control & RTC_CTRL_MODE12) {
895 hour = t->tm_hour + 1;
896 if (hour > 12)
897 hour = RTC_HR_PM | bin2bcd(hour - 12);
898 else
899 hour = bin2bcd(hour);
900 } else
901 hour = bin2bcd(t->tm_hour);
902 status = menelaus_write_reg(regnum++, hour);
903 if (status < 0)
904 goto fail;
905
906 status = menelaus_write_reg(regnum++, bin2bcd(t->tm_mday));
907 if (status < 0)
908 goto fail;
909
910 status = menelaus_write_reg(regnum++, bin2bcd(t->tm_mon + 1));
911 if (status < 0)
912 goto fail;
913
914 status = menelaus_write_reg(regnum++, bin2bcd(t->tm_year - 100));
915 if (status < 0)
916 goto fail;
917
918 return 0;
919 fail:
920 dev_err(&the_menelaus->client->dev, "rtc write reg %02x, err %d\n",
921 --regnum, status);
922 return status;
923 }
924
925 static int menelaus_read_time(struct device *dev, struct rtc_time *t)
926 {
927 struct i2c_msg msg[2];
928 char regs[7];
929 int status;
930
931 /* block read date and time registers */
932 regs[0] = MENELAUS_RTC_SEC;
933
934 msg[0].addr = MENELAUS_I2C_ADDRESS;
935 msg[0].flags = 0;
936 msg[0].len = 1;
937 msg[0].buf = regs;
938
939 msg[1].addr = MENELAUS_I2C_ADDRESS;
940 msg[1].flags = I2C_M_RD;
941 msg[1].len = sizeof(regs);
942 msg[1].buf = regs;
943
944 status = i2c_transfer(the_menelaus->client->adapter, msg, 2);
945 if (status != 2) {
946 dev_err(dev, "%s error %d\n", "read", status);
947 return -EIO;
948 }
949
950 menelaus_to_time(regs, t);
951 t->tm_wday = bcd2bin(regs[6]);
952
953 return 0;
954 }
955
956 static int menelaus_set_time(struct device *dev, struct rtc_time *t)
957 {
958 int status;
959
960 /* write date and time registers */
961 status = time_to_menelaus(t, MENELAUS_RTC_SEC);
962 if (status < 0)
963 return status;
964 status = menelaus_write_reg(MENELAUS_RTC_WKDAY, bin2bcd(t->tm_wday));
965 if (status < 0) {
966 dev_err(&the_menelaus->client->dev, "rtc write reg %02x "
967 "err %d\n", MENELAUS_RTC_WKDAY, status);
968 return status;
969 }
970
971 /* now commit the write */
972 status = menelaus_write_reg(MENELAUS_RTC_UPDATE, RTC_UPDATE_EVERY);
973 if (status < 0)
974 dev_err(&the_menelaus->client->dev, "rtc commit time, err %d\n",
975 status);
976
977 return 0;
978 }
979
980 static int menelaus_read_alarm(struct device *dev, struct rtc_wkalrm *w)
981 {
982 struct i2c_msg msg[2];
983 char regs[6];
984 int status;
985
986 /* block read alarm registers */
987 regs[0] = MENELAUS_RTC_AL_SEC;
988
989 msg[0].addr = MENELAUS_I2C_ADDRESS;
990 msg[0].flags = 0;
991 msg[0].len = 1;
992 msg[0].buf = regs;
993
994 msg[1].addr = MENELAUS_I2C_ADDRESS;
995 msg[1].flags = I2C_M_RD;
996 msg[1].len = sizeof(regs);
997 msg[1].buf = regs;
998
999 status = i2c_transfer(the_menelaus->client->adapter, msg, 2);
1000 if (status != 2) {
1001 dev_err(dev, "%s error %d\n", "alarm read", status);
1002 return -EIO;
1003 }
1004
1005 menelaus_to_time(regs, &w->time);
1006
1007 w->enabled = !!(the_menelaus->rtc_control & RTC_CTRL_AL_EN);
1008
1009 /* NOTE we *could* check if actually pending... */
1010 w->pending = 0;
1011
1012 return 0;
1013 }
1014
1015 static int menelaus_set_alarm(struct device *dev, struct rtc_wkalrm *w)
1016 {
1017 int status;
1018
1019 if (the_menelaus->client->irq <= 0 && w->enabled)
1020 return -ENODEV;
1021
1022 /* clear previous alarm enable */
1023 if (the_menelaus->rtc_control & RTC_CTRL_AL_EN) {
1024 the_menelaus->rtc_control &= ~RTC_CTRL_AL_EN;
1025 status = menelaus_write_reg(MENELAUS_RTC_CTRL,
1026 the_menelaus->rtc_control);
1027 if (status < 0)
1028 return status;
1029 }
1030
1031 /* write alarm registers */
1032 status = time_to_menelaus(&w->time, MENELAUS_RTC_AL_SEC);
1033 if (status < 0)
1034 return status;
1035
1036 /* enable alarm if requested */
1037 if (w->enabled) {
1038 the_menelaus->rtc_control |= RTC_CTRL_AL_EN;
1039 status = menelaus_write_reg(MENELAUS_RTC_CTRL,
1040 the_menelaus->rtc_control);
1041 }
1042
1043 return status;
1044 }
1045
1046 #ifdef CONFIG_RTC_INTF_DEV
1047
1048 static void menelaus_rtc_update_work(struct menelaus_chip *m)
1049 {
1050 /* report 1/sec update */
1051 local_irq_disable();
1052 rtc_update_irq(m->rtc, 1, RTC_IRQF | RTC_UF);
1053 local_irq_enable();
1054 }
1055
1056 static int menelaus_ioctl(struct device *dev, unsigned cmd, unsigned long arg)
1057 {
1058 int status;
1059
1060 if (the_menelaus->client->irq <= 0)
1061 return -ENOIOCTLCMD;
1062
1063 switch (cmd) {
1064 /* alarm IRQ */
1065 case RTC_AIE_ON:
1066 if (the_menelaus->rtc_control & RTC_CTRL_AL_EN)
1067 return 0;
1068 the_menelaus->rtc_control |= RTC_CTRL_AL_EN;
1069 break;
1070 case RTC_AIE_OFF:
1071 if (!(the_menelaus->rtc_control & RTC_CTRL_AL_EN))
1072 return 0;
1073 the_menelaus->rtc_control &= ~RTC_CTRL_AL_EN;
1074 break;
1075 /* 1/second "update" IRQ */
1076 case RTC_UIE_ON:
1077 if (the_menelaus->uie)
1078 return 0;
1079 status = menelaus_remove_irq_work(MENELAUS_RTCTMR_IRQ);
1080 status = menelaus_add_irq_work(MENELAUS_RTCTMR_IRQ,
1081 menelaus_rtc_update_work);
1082 if (status == 0)
1083 the_menelaus->uie = 1;
1084 return status;
1085 case RTC_UIE_OFF:
1086 if (!the_menelaus->uie)
1087 return 0;
1088 status = menelaus_remove_irq_work(MENELAUS_RTCTMR_IRQ);
1089 if (status == 0)
1090 the_menelaus->uie = 0;
1091 return status;
1092 default:
1093 return -ENOIOCTLCMD;
1094 }
1095 return menelaus_write_reg(MENELAUS_RTC_CTRL, the_menelaus->rtc_control);
1096 }
1097
1098 #else
1099 #define menelaus_ioctl NULL
1100 #endif
1101
1102 /* REVISIT no compensation register support ... */
1103
1104 static const struct rtc_class_ops menelaus_rtc_ops = {
1105 .ioctl = menelaus_ioctl,
1106 .read_time = menelaus_read_time,
1107 .set_time = menelaus_set_time,
1108 .read_alarm = menelaus_read_alarm,
1109 .set_alarm = menelaus_set_alarm,
1110 };
1111
1112 static void menelaus_rtc_alarm_work(struct menelaus_chip *m)
1113 {
1114 /* report alarm */
1115 local_irq_disable();
1116 rtc_update_irq(m->rtc, 1, RTC_IRQF | RTC_AF);
1117 local_irq_enable();
1118
1119 /* then disable it; alarms are oneshot */
1120 the_menelaus->rtc_control &= ~RTC_CTRL_AL_EN;
1121 menelaus_write_reg(MENELAUS_RTC_CTRL, the_menelaus->rtc_control);
1122 }
1123
1124 static inline void menelaus_rtc_init(struct menelaus_chip *m)
1125 {
1126 int alarm = (m->client->irq > 0);
1127
1128 /* assume 32KDETEN pin is pulled high */
1129 if (!(menelaus_read_reg(MENELAUS_OSC_CTRL) & 0x80)) {
1130 dev_dbg(&m->client->dev, "no 32k oscillator\n");
1131 return;
1132 }
1133
1134 /* support RTC alarm; it can issue wakeups */
1135 if (alarm) {
1136 if (menelaus_add_irq_work(MENELAUS_RTCALM_IRQ,
1137 menelaus_rtc_alarm_work) < 0) {
1138 dev_err(&m->client->dev, "can't handle RTC alarm\n");
1139 return;
1140 }
1141 device_init_wakeup(&m->client->dev, 1);
1142 }
1143
1144 /* be sure RTC is enabled; allow 1/sec irqs; leave 12hr mode alone */
1145 m->rtc_control = menelaus_read_reg(MENELAUS_RTC_CTRL);
1146 if (!(m->rtc_control & RTC_CTRL_RTC_EN)
1147 || (m->rtc_control & RTC_CTRL_AL_EN)
1148 || (m->rtc_control & RTC_CTRL_EVERY_MASK)) {
1149 if (!(m->rtc_control & RTC_CTRL_RTC_EN)) {
1150 dev_warn(&m->client->dev, "rtc clock needs setting\n");
1151 m->rtc_control |= RTC_CTRL_RTC_EN;
1152 }
1153 m->rtc_control &= ~RTC_CTRL_EVERY_MASK;
1154 m->rtc_control &= ~RTC_CTRL_AL_EN;
1155 menelaus_write_reg(MENELAUS_RTC_CTRL, m->rtc_control);
1156 }
1157
1158 m->rtc = rtc_device_register(DRIVER_NAME,
1159 &m->client->dev,
1160 &menelaus_rtc_ops, THIS_MODULE);
1161 if (IS_ERR(m->rtc)) {
1162 if (alarm) {
1163 menelaus_remove_irq_work(MENELAUS_RTCALM_IRQ);
1164 device_init_wakeup(&m->client->dev, 0);
1165 }
1166 dev_err(&m->client->dev, "can't register RTC: %d\n",
1167 (int) PTR_ERR(m->rtc));
1168 the_menelaus->rtc = NULL;
1169 }
1170 }
1171
1172 #else
1173
1174 static inline void menelaus_rtc_init(struct menelaus_chip *m)
1175 {
1176 /* nothing */
1177 }
1178
1179 #endif
1180
1181 /*-----------------------------------------------------------------------*/
1182
1183 static struct i2c_driver menelaus_i2c_driver;
1184
1185 static int menelaus_probe(struct i2c_client *client,
1186 const struct i2c_device_id *id)
1187 {
1188 struct menelaus_chip *menelaus;
1189 int rev = 0, val;
1190 int err = 0;
1191 struct menelaus_platform_data *menelaus_pdata =
1192 dev_get_platdata(&client->dev);
1193
1194 if (the_menelaus) {
1195 dev_dbg(&client->dev, "only one %s for now\n",
1196 DRIVER_NAME);
1197 return -ENODEV;
1198 }
1199
1200 menelaus = devm_kzalloc(&client->dev, sizeof(*menelaus), GFP_KERNEL);
1201 if (!menelaus)
1202 return -ENOMEM;
1203
1204 i2c_set_clientdata(client, menelaus);
1205
1206 the_menelaus = menelaus;
1207 menelaus->client = client;
1208
1209 /* If a true probe check the device */
1210 rev = menelaus_read_reg(MENELAUS_REV);
1211 if (rev < 0) {
1212 pr_err(DRIVER_NAME ": device not found");
1213 return -ENODEV;
1214 }
1215
1216 /* Ack and disable all Menelaus interrupts */
1217 menelaus_write_reg(MENELAUS_INT_ACK1, 0xff);
1218 menelaus_write_reg(MENELAUS_INT_ACK2, 0xff);
1219 menelaus_write_reg(MENELAUS_INT_MASK1, 0xff);
1220 menelaus_write_reg(MENELAUS_INT_MASK2, 0xff);
1221 menelaus->mask1 = 0xff;
1222 menelaus->mask2 = 0xff;
1223
1224 /* Set output buffer strengths */
1225 menelaus_write_reg(MENELAUS_MCT_CTRL1, 0x73);
1226
1227 if (client->irq > 0) {
1228 err = request_irq(client->irq, menelaus_irq, 0,
1229 DRIVER_NAME, menelaus);
1230 if (err) {
1231 dev_dbg(&client->dev, "can't get IRQ %d, err %d\n",
1232 client->irq, err);
1233 return err;
1234 }
1235 }
1236
1237 mutex_init(&menelaus->lock);
1238 INIT_WORK(&menelaus->work, menelaus_work);
1239
1240 pr_info("Menelaus rev %d.%d\n", rev >> 4, rev & 0x0f);
1241
1242 val = menelaus_read_reg(MENELAUS_VCORE_CTRL1);
1243 if (val < 0)
1244 goto fail;
1245 if (val & (1 << 7))
1246 menelaus->vcore_hw_mode = 1;
1247 else
1248 menelaus->vcore_hw_mode = 0;
1249
1250 if (menelaus_pdata != NULL && menelaus_pdata->late_init != NULL) {
1251 err = menelaus_pdata->late_init(&client->dev);
1252 if (err < 0)
1253 goto fail;
1254 }
1255
1256 menelaus_rtc_init(menelaus);
1257
1258 return 0;
1259 fail:
1260 free_irq(client->irq, menelaus);
1261 flush_work(&menelaus->work);
1262 return err;
1263 }
1264
1265 static int __exit menelaus_remove(struct i2c_client *client)
1266 {
1267 struct menelaus_chip *menelaus = i2c_get_clientdata(client);
1268
1269 free_irq(client->irq, menelaus);
1270 flush_work(&menelaus->work);
1271 the_menelaus = NULL;
1272 return 0;
1273 }
1274
1275 static const struct i2c_device_id menelaus_id[] = {
1276 { "menelaus", 0 },
1277 { }
1278 };
1279 MODULE_DEVICE_TABLE(i2c, menelaus_id);
1280
1281 static struct i2c_driver menelaus_i2c_driver = {
1282 .driver = {
1283 .name = DRIVER_NAME,
1284 },
1285 .probe = menelaus_probe,
1286 .remove = __exit_p(menelaus_remove),
1287 .id_table = menelaus_id,
1288 };
1289
1290 static int __init menelaus_init(void)
1291 {
1292 int res;
1293
1294 res = i2c_add_driver(&menelaus_i2c_driver);
1295 if (res < 0) {
1296 pr_err(DRIVER_NAME ": driver registration failed\n");
1297 return res;
1298 }
1299
1300 return 0;
1301 }
1302
1303 static void __exit menelaus_exit(void)
1304 {
1305 i2c_del_driver(&menelaus_i2c_driver);
1306
1307 /* FIXME: Shutdown menelaus parts that can be shut down */
1308 }
1309
1310 MODULE_AUTHOR("Texas Instruments, Inc. (and others)");
1311 MODULE_DESCRIPTION("I2C interface for Menelaus.");
1312 MODULE_LICENSE("GPL");
1313
1314 module_init(menelaus_init);
1315 module_exit(menelaus_exit);
Linux with added FPC-III support