kernel/sound/aoa/core/gpio-pmf.c

   1 /*
   2  * Apple Onboard Audio pmf GPIOs
   3  *
   4  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
   5  *
   6  * GPL v2, can be found in COPYING.
   7  */
   8
   9 #include <linux/slab.h>
  10 #include <asm/pmac_feature.h>
  11 #include <asm/pmac_pfunc.h>
  12 #include "../aoa.h"
  13
  14 #define PMF_GPIO(name, bit)                                     \
  15 static void pmf_gpio_set_##name(struct gpio_runtime *rt, int on)\
  16 {                                                               \
  17         struct pmf_args args = { .count = 1, .u[0].v = !on };   \
  18         int rc;                                                 \
  19                                                         \
  20         if (unlikely(!rt)) return;                              \
  21         rc = pmf_call_function(rt->node, #name "-mute", &args); \
  22         if (rc && rc != -ENODEV)                                \
  23                 printk(KERN_WARNING "pmf_gpio_set_" #name       \
  24                 " failed, rc: %d\n", rc);                       \
  25         rt->implementation_private &= ~(1<<bit);                \
  26         rt->implementation_private |= (!!on << bit);            \
  27 }                                                               \
  28 static int pmf_gpio_get_##name(struct gpio_runtime *rt)         \
  29 {                                                               \
  30         if (unlikely(!rt)) return 0;                            \
  31         return (rt->implementation_private>>bit)&1;             \
  32 }
  33
  34 PMF_GPIO(headphone, 0);
  35 PMF_GPIO(amp, 1);
  36 PMF_GPIO(lineout, 2);
  37
  38 static void pmf_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
  39 {
  40         struct pmf_args args = { .count = 1, .u[0].v = !!on };
  41         int rc;
  42
  43         if (unlikely(!rt)) return;
  44         rc = pmf_call_function(rt->node, "hw-reset", &args);
  45         if (rc)
  46                 printk(KERN_WARNING "pmf_gpio_set_hw_reset"
  47                        " failed, rc: %d\n", rc);
  48 }
  49
  50 static void pmf_gpio_all_amps_off(struct gpio_runtime *rt)
  51 {
  52         int saved;
  53
  54         if (unlikely(!rt)) return;
  55         saved = rt->implementation_private;
  56         pmf_gpio_set_headphone(rt, 0);
  57         pmf_gpio_set_amp(rt, 0);
  58         pmf_gpio_set_lineout(rt, 0);
  59         rt->implementation_private = saved;
  60 }
  61
  62 static void pmf_gpio_all_amps_restore(struct gpio_runtime *rt)
  63 {
  64         int s;
  65
  66         if (unlikely(!rt)) return;
  67         s = rt->implementation_private;
  68         pmf_gpio_set_headphone(rt, (s>>0)&1);
  69         pmf_gpio_set_amp(rt, (s>>1)&1);
  70         pmf_gpio_set_lineout(rt, (s>>2)&1);
  71 }
  72
  73 static void pmf_handle_notify(struct work_struct *work)
  74 {
  75         struct gpio_notification *notif =
  76                 container_of(work, struct gpio_notification, work.work);
  77
  78         mutex_lock(&notif->mutex);
  79         if (notif->notify)
  80                 notif->notify(notif->data);
  81         mutex_unlock(&notif->mutex);
  82 }
  83
  84 static void pmf_gpio_init(struct gpio_runtime *rt)
  85 {
  86         pmf_gpio_all_amps_off(rt);
  87         rt->implementation_private = 0;
  88         INIT_DELAYED_WORK(&rt->headphone_notify.work, pmf_handle_notify);
  89         INIT_DELAYED_WORK(&rt->line_in_notify.work, pmf_handle_notify);
  90         INIT_DELAYED_WORK(&rt->line_out_notify.work, pmf_handle_notify);
  91         mutex_init(&rt->headphone_notify.mutex);
  92         mutex_init(&rt->line_in_notify.mutex);
  93         mutex_init(&rt->line_out_notify.mutex);
  94 }
  95
  96 static void pmf_gpio_exit(struct gpio_runtime *rt)
  97 {
  98         pmf_gpio_all_amps_off(rt);
  99         rt->implementation_private = 0;
 100
 101         if (rt->headphone_notify.gpio_private)
 102                 pmf_unregister_irq_client(rt->headphone_notify.gpio_private);
 103         if (rt->line_in_notify.gpio_private)
 104                 pmf_unregister_irq_client(rt->line_in_notify.gpio_private);
 105         if (rt->line_out_notify.gpio_private)
 106                 pmf_unregister_irq_client(rt->line_out_notify.gpio_private);
 107
 108         /* make sure no work is pending before freeing
 109          * all things */
 110         cancel_delayed_work_sync(&rt->headphone_notify.work);
 111         cancel_delayed_work_sync(&rt->line_in_notify.work);
 112         cancel_delayed_work_sync(&rt->line_out_notify.work);
 113
 114         mutex_destroy(&rt->headphone_notify.mutex);
 115         mutex_destroy(&rt->line_in_notify.mutex);
 116         mutex_destroy(&rt->line_out_notify.mutex);
 117
 118         kfree(rt->headphone_notify.gpio_private);
 119         kfree(rt->line_in_notify.gpio_private);
 120         kfree(rt->line_out_notify.gpio_private);
 121 }
 122
 123 static void pmf_handle_notify_irq(void *data)
 124 {
 125         struct gpio_notification *notif = data;
 126
 127         schedule_delayed_work(&notif->work, 0);
 128 }
 129
 130 static int pmf_set_notify(struct gpio_runtime *rt,
 131                           enum notify_type type,
 132                           notify_func_t notify,
 133                           void *data)
 134 {
 135         struct gpio_notification *notif;
 136         notify_func_t old;
 137         struct pmf_irq_client *irq_client;
 138         char *name;
 139         int err = -EBUSY;
 140
 141         switch (type) {
 142         case AOA_NOTIFY_HEADPHONE:
 143                 notif = &rt->headphone_notify;
 144                 name = "headphone-detect";
 145                 break;
 146         case AOA_NOTIFY_LINE_IN:
 147                 notif = &rt->line_in_notify;
 148                 name = "linein-detect";
 149                 break;
 150         case AOA_NOTIFY_LINE_OUT:
 151                 notif = &rt->line_out_notify;
 152                 name = "lineout-detect";
 153                 break;
 154         default:
 155                 return -EINVAL;
 156         }
 157
 158         mutex_lock(&notif->mutex);
 159
 160         old = notif->notify;
 161
 162         if (!old && !notify) {
 163                 err = 0;
 164                 goto out_unlock;
 165         }
 166
 167         if (old && notify) {
 168                 if (old == notify && notif->data == data)
 169                         err = 0;
 170                 goto out_unlock;
 171         }
 172
 173         if (old && !notify) {
 174                 irq_client = notif->gpio_private;
 175                 pmf_unregister_irq_client(irq_client);
 176                 kfree(irq_client);
 177                 notif->gpio_private = NULL;
 178         }
 179         if (!old && notify) {
 180                 irq_client = kzalloc(sizeof(struct pmf_irq_client),
 181                                      GFP_KERNEL);
 182                 if (!irq_client) {
 183                         err = -ENOMEM;
 184                         goto out_unlock;
 185                 }
 186                 irq_client->data = notif;
 187                 irq_client->handler = pmf_handle_notify_irq;
 188                 irq_client->owner = THIS_MODULE;
 189                 err = pmf_register_irq_client(rt->node,
 190                                               name,
 191                                               irq_client);
 192                 if (err) {
 193                         printk(KERN_ERR "snd-aoa: gpio layer failed to"
 194                                         " register %s irq (%d)\n", name, err);
 195                         kfree(irq_client);
 196                         goto out_unlock;
 197                 }
 198                 notif->gpio_private = irq_client;
 199         }
 200         notif->notify = notify;
 201         notif->data = data;
 202
 203         err = 0;
 204  out_unlock:
 205         mutex_unlock(&notif->mutex);
 206         return err;
 207 }
 208
 209 static int pmf_get_detect(struct gpio_runtime *rt,
 210                           enum notify_type type)
 211 {
 212         char *name;
 213         int err = -EBUSY, ret;
 214         struct pmf_args args = { .count = 1, .u[0].p = &ret };
 215
 216         switch (type) {
 217         case AOA_NOTIFY_HEADPHONE:
 218                 name = "headphone-detect";
 219                 break;
 220         case AOA_NOTIFY_LINE_IN:
 221                 name = "linein-detect";
 222                 break;
 223         case AOA_NOTIFY_LINE_OUT:
 224                 name = "lineout-detect";
 225                 break;
 226         default:
 227                 return -EINVAL;
 228         }
 229
 230         err = pmf_call_function(rt->node, name, &args);
 231         if (err)
 232                 return err;
 233         return ret;
 234 }
 235
 236 static struct gpio_methods methods = {
 237         .init                   = pmf_gpio_init,
 238         .exit                   = pmf_gpio_exit,
 239         .all_amps_off           = pmf_gpio_all_amps_off,
 240         .all_amps_restore       = pmf_gpio_all_amps_restore,
 241         .set_headphone          = pmf_gpio_set_headphone,
 242         .set_speakers           = pmf_gpio_set_amp,
 243         .set_lineout            = pmf_gpio_set_lineout,
 244         .set_hw_reset           = pmf_gpio_set_hw_reset,
 245         .get_headphone          = pmf_gpio_get_headphone,
 246         .get_speakers           = pmf_gpio_get_amp,
 247         .get_lineout            = pmf_gpio_get_lineout,
 248         .set_notify             = pmf_set_notify,
 249         .get_detect             = pmf_get_detect,
 250 };
 251
 252 struct gpio_methods *pmf_gpio_methods = &methods;
 253 EXPORT_SYMBOL_GPL(pmf_gpio_methods);