drivers/mfd/pcf50633-irq.c

   1 /* NXP PCF50633 Power Management Unit (PMU) driver
   2  *
   3  * (C) 2006-2008 by Openmoko, Inc.
   4  * Author: Harald Welte <laforge@openmoko.org>
   5  *         Balaji Rao <balajirrao@openmoko.org>
   6  * All rights reserved.
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  */
  14
  15 #include <linux/interrupt.h>
  16 #include <linux/kernel.h>
  17 #include <linux/mutex.h>
  18 #include <linux/export.h>
  19 #include <linux/slab.h>
  20
  21 #include <linux/mfd/pcf50633/core.h>
  22 #include <linux/mfd/pcf50633/mbc.h>
  23
  24 int pcf50633_register_irq(struct pcf50633 *pcf, int irq,
  25                         void (*handler) (int, void *), void *data)
  26 {
  27         if (irq < 0 || irq >= PCF50633_NUM_IRQ || !handler)
  28                 return -EINVAL;
  29
  30         if (WARN_ON(pcf->irq_handler[irq].handler))
  31                 return -EBUSY;
  32
  33         mutex_lock(&pcf->lock);
  34         pcf->irq_handler[irq].handler = handler;
  35         pcf->irq_handler[irq].data = data;
  36         mutex_unlock(&pcf->lock);
  37
  38         return 0;
  39 }
  40 EXPORT_SYMBOL_GPL(pcf50633_register_irq);
  41
  42 int pcf50633_free_irq(struct pcf50633 *pcf, int irq)
  43 {
  44         if (irq < 0 || irq >= PCF50633_NUM_IRQ)
  45                 return -EINVAL;
  46
  47         mutex_lock(&pcf->lock);
  48         pcf->irq_handler[irq].handler = NULL;
  49         mutex_unlock(&pcf->lock);
  50
  51         return 0;
  52 }
  53 EXPORT_SYMBOL_GPL(pcf50633_free_irq);
  54
  55 static int __pcf50633_irq_mask_set(struct pcf50633 *pcf, int irq, u8 mask)
  56 {
  57         u8 reg, bit;
  58         int ret = 0, idx;
  59
  60         idx = irq >> 3;
  61         reg = PCF50633_REG_INT1M + idx;
  62         bit = 1 << (irq & 0x07);
  63
  64         pcf50633_reg_set_bit_mask(pcf, reg, bit, mask ? bit : 0);
  65
  66         mutex_lock(&pcf->lock);
  67
  68         if (mask)
  69                 pcf->mask_regs[idx] |= bit;
  70         else
  71                 pcf->mask_regs[idx] &= ~bit;
  72
  73         mutex_unlock(&pcf->lock);
  74
  75         return ret;
  76 }
  77
  78 int pcf50633_irq_mask(struct pcf50633 *pcf, int irq)
  79 {
  80         dev_dbg(pcf->dev, "Masking IRQ %d\n", irq);
  81
  82         return __pcf50633_irq_mask_set(pcf, irq, 1);
  83 }
  84 EXPORT_SYMBOL_GPL(pcf50633_irq_mask);
  85
  86 int pcf50633_irq_unmask(struct pcf50633 *pcf, int irq)
  87 {
  88         dev_dbg(pcf->dev, "Unmasking IRQ %d\n", irq);
  89
  90         return __pcf50633_irq_mask_set(pcf, irq, 0);
  91 }
  92 EXPORT_SYMBOL_GPL(pcf50633_irq_unmask);
  93
  94 int pcf50633_irq_mask_get(struct pcf50633 *pcf, int irq)
  95 {
  96         u8 reg, bits;
  97
  98         reg =  irq >> 3;
  99         bits = 1 << (irq & 0x07);
 100
 101         return pcf->mask_regs[reg] & bits;
 102 }
 103 EXPORT_SYMBOL_GPL(pcf50633_irq_mask_get);
 104
 105 static void pcf50633_irq_call_handler(struct pcf50633 *pcf, int irq)
 106 {
 107         if (pcf->irq_handler[irq].handler)
 108                 pcf->irq_handler[irq].handler(irq, pcf->irq_handler[irq].data);
 109 }
 110
 111 /* Maximum amount of time ONKEY is held before emergency action is taken */
 112 #define PCF50633_ONKEY1S_TIMEOUT 8
 113
 114 static irqreturn_t pcf50633_irq(int irq, void *data)
 115 {
 116         struct pcf50633 *pcf = data;
 117         int ret, i, j;
 118         u8 pcf_int[5], chgstat;
 119
 120         /* Read the 5 INT regs in one transaction */
 121         ret = pcf50633_read_block(pcf, PCF50633_REG_INT1,
 122                                                 ARRAY_SIZE(pcf_int), pcf_int);
 123         if (ret != ARRAY_SIZE(pcf_int)) {
 124                 dev_err(pcf->dev, "Error reading INT registers\n");
 125
 126                 /*
 127                  * If this doesn't ACK the interrupt to the chip, we'll be
 128                  * called once again as we're level triggered.
 129                  */
 130                 goto out;
 131         }
 132
 133         /* defeat 8s death from lowsys on A5 */
 134         pcf50633_reg_write(pcf, PCF50633_REG_OOCSHDWN,  0x04);
 135
 136         /* We immediately read the usb and adapter status. We thus make sure
 137          * only of USBINS/USBREM IRQ handlers are called */
 138         if (pcf_int[0] & (PCF50633_INT1_USBINS | PCF50633_INT1_USBREM)) {
 139                 chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
 140                 if (chgstat & (0x3 << 4))
 141                         pcf_int[0] &= ~PCF50633_INT1_USBREM;
 142                 else
 143                         pcf_int[0] &= ~PCF50633_INT1_USBINS;
 144         }
 145
 146         /* Make sure only one of ADPINS or ADPREM is set */
 147         if (pcf_int[0] & (PCF50633_INT1_ADPINS | PCF50633_INT1_ADPREM)) {
 148                 chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
 149                 if (chgstat & (0x3 << 4))
 150                         pcf_int[0] &= ~PCF50633_INT1_ADPREM;
 151                 else
 152                         pcf_int[0] &= ~PCF50633_INT1_ADPINS;
 153         }
 154
 155         dev_dbg(pcf->dev, "INT1=0x%02x INT2=0x%02x INT3=0x%02x "
 156                         "INT4=0x%02x INT5=0x%02x\n", pcf_int[0],
 157                         pcf_int[1], pcf_int[2], pcf_int[3], pcf_int[4]);
 158
 159         /* Some revisions of the chip don't have a 8s standby mode on
 160          * ONKEY1S press. We try to manually do it in such cases. */
 161         if ((pcf_int[0] & PCF50633_INT1_SECOND) && pcf->onkey1s_held) {
 162                 dev_info(pcf->dev, "ONKEY1S held for %d secs\n",
 163                                                         pcf->onkey1s_held);
 164                 if (pcf->onkey1s_held++ == PCF50633_ONKEY1S_TIMEOUT)
 165                         if (pcf->pdata->force_shutdown)
 166                                 pcf->pdata->force_shutdown(pcf);
 167         }
 168
 169         if (pcf_int[2] & PCF50633_INT3_ONKEY1S) {
 170                 dev_info(pcf->dev, "ONKEY1S held\n");
 171                 pcf->onkey1s_held = 1 ;
 172
 173                 /* Unmask IRQ_SECOND */
 174                 pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT1M,
 175                                                 PCF50633_INT1_SECOND);
 176
 177                 /* Unmask IRQ_ONKEYR */
 178                 pcf50633_reg_clear_bits(pcf, PCF50633_REG_INT2M,
 179                                                 PCF50633_INT2_ONKEYR);
 180         }
 181
 182         if ((pcf_int[1] & PCF50633_INT2_ONKEYR) && pcf->onkey1s_held) {
 183                 pcf->onkey1s_held = 0;
 184
 185                 /* Mask SECOND and ONKEYR interrupts */
 186                 if (pcf->mask_regs[0] & PCF50633_INT1_SECOND)
 187                         pcf50633_reg_set_bit_mask(pcf,
 188                                         PCF50633_REG_INT1M,
 189                                         PCF50633_INT1_SECOND,
 190                                         PCF50633_INT1_SECOND);
 191
 192                 if (pcf->mask_regs[1] & PCF50633_INT2_ONKEYR)
 193                         pcf50633_reg_set_bit_mask(pcf,
 194                                         PCF50633_REG_INT2M,
 195                                         PCF50633_INT2_ONKEYR,
 196                                         PCF50633_INT2_ONKEYR);
 197         }
 198
 199         /* Have we just resumed ? */
 200         if (pcf->is_suspended) {
 201                 pcf->is_suspended = 0;
 202
 203                 /* Set the resume reason filtering out non resumers */
 204                 for (i = 0; i < ARRAY_SIZE(pcf_int); i++)
 205                         pcf->resume_reason[i] = pcf_int[i] &
 206                                                 pcf->pdata->resumers[i];
 207
 208                 /* Make sure we don't pass on any ONKEY events to
 209                  * userspace now */
 210                 pcf_int[1] &= ~(PCF50633_INT2_ONKEYR | PCF50633_INT2_ONKEYF);
 211         }
 212
 213         for (i = 0; i < ARRAY_SIZE(pcf_int); i++) {
 214                 /* Unset masked interrupts */
 215                 pcf_int[i] &= ~pcf->mask_regs[i];
 216
 217                 for (j = 0; j < 8 ; j++)
 218                         if (pcf_int[i] & (1 << j))
 219                                 pcf50633_irq_call_handler(pcf, (i * 8) + j);
 220         }
 221
 222 out:
 223         return IRQ_HANDLED;
 224 }
 225
 226 #ifdef CONFIG_PM
 227
 228 int pcf50633_irq_suspend(struct pcf50633 *pcf)
 229 {
 230         int ret;
 231         int i;
 232         u8 res[5];
 233
 234
 235         /* Make sure our interrupt handlers are not called
 236          * henceforth */
 237         disable_irq(pcf->irq);
 238
 239         /* Save the masks */
 240         ret = pcf50633_read_block(pcf, PCF50633_REG_INT1M,
 241                                 ARRAY_SIZE(pcf->suspend_irq_masks),
 242                                         pcf->suspend_irq_masks);
 243         if (ret < 0) {
 244                 dev_err(pcf->dev, "error saving irq masks\n");
 245                 goto out;
 246         }
 247
 248         /* Write wakeup irq masks */
 249         for (i = 0; i < ARRAY_SIZE(res); i++)
 250                 res[i] = ~pcf->pdata->resumers[i];
 251
 252         ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
 253                                         ARRAY_SIZE(res), &res[0]);
 254         if (ret < 0) {
 255                 dev_err(pcf->dev, "error writing wakeup irq masks\n");
 256                 goto out;
 257         }
 258
 259         pcf->is_suspended = 1;
 260
 261 out:
 262         return ret;
 263 }
 264
 265 int pcf50633_irq_resume(struct pcf50633 *pcf)
 266 {
 267         int ret;
 268
 269         /* Write the saved mask registers */
 270         ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
 271                                 ARRAY_SIZE(pcf->suspend_irq_masks),
 272                                         pcf->suspend_irq_masks);
 273         if (ret < 0)
 274                 dev_err(pcf->dev, "Error restoring saved suspend masks\n");
 275
 276         enable_irq(pcf->irq);
 277
 278         return ret;
 279 }
 280
 281 #endif
 282
 283 int pcf50633_irq_init(struct pcf50633 *pcf, int irq)
 284 {
 285         int ret;
 286
 287         pcf->irq = irq;
 288
 289         /* Enable all interrupts except RTC SECOND */
 290         pcf->mask_regs[0] = 0x80;
 291         pcf50633_reg_write(pcf, PCF50633_REG_INT1M, pcf->mask_regs[0]);
 292         pcf50633_reg_write(pcf, PCF50633_REG_INT2M, 0x00);
 293         pcf50633_reg_write(pcf, PCF50633_REG_INT3M, 0x00);
 294         pcf50633_reg_write(pcf, PCF50633_REG_INT4M, 0x00);
 295         pcf50633_reg_write(pcf, PCF50633_REG_INT5M, 0x00);
 296
 297         ret = request_threaded_irq(irq, NULL, pcf50633_irq,
 298                                         IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 299                                         "pcf50633", pcf);
 300
 301         if (ret)
 302                 dev_err(pcf->dev, "Failed to request IRQ %d\n", ret);
 303
 304         if (enable_irq_wake(irq) < 0)
 305                 dev_err(pcf->dev, "IRQ %u cannot be enabled as wake-up source"
 306                         "in this hardware revision", irq);
 307
 308         return ret;
 309 }
 310
 311 void pcf50633_irq_free(struct pcf50633 *pcf)
 312 {
 313         free_irq(pcf->irq, pcf);
 314 }