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gpio-pmf.c
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1 /*
2  * Apple Onboard Audio pmf GPIOs
3  *
4  * Copyright 2006 Johannes Berg <[email protected]>
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);
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