1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Apple Onboard Audio pmf GPIOs
4 *
5 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
6 */
7
8 #include <linux/slab.h>
9 #include <asm/pmac_feature.h>
10 #include <asm/pmac_pfunc.h>
11 #include "../aoa.h"
12
13 #define PMF_GPIO(name, bit) \
14 static void pmf_gpio_set_##name(struct gpio_runtime *rt, int on)\
15 { \
16 struct pmf_args args = { .count = 1, .u[0].v = !on }; \
17 int rc; \
18 \
19 if (unlikely(!rt)) return; \
20 rc = pmf_call_function(rt->node, #name "-mute", &args); \
21 if (rc && rc != -ENODEV) \
22 printk(KERN_WARNING "pmf_gpio_set_" #name \
23 " failed, rc: %d\n", rc); \
24 rt->implementation_private &= ~(1<<bit); \
25 rt->implementation_private |= (!!on << bit); \
26 } \
27 static int pmf_gpio_get_##name(struct gpio_runtime *rt) \
28 { \
29 if (unlikely(!rt)) return 0; \
30 return (rt->implementation_private>>bit)&1; \
31 }
32
33 PMF_GPIO(headphone, 0);
34 PMF_GPIO(amp, 1);
35 PMF_GPIO(lineout, 2);
36
pmf_gpio_set_hw_reset(struct gpio_runtime * rt,int on)37 static void pmf_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
38 {
39 struct pmf_args args = { .count = 1, .u[0].v = !!on };
40 int rc;
41
42 if (unlikely(!rt)) return;
43 rc = pmf_call_function(rt->node, "hw-reset", &args);
44 if (rc)
45 printk(KERN_WARNING "pmf_gpio_set_hw_reset"
46 " failed, rc: %d\n", rc);
47 }
48
pmf_gpio_all_amps_off(struct gpio_runtime * rt)49 static void pmf_gpio_all_amps_off(struct gpio_runtime *rt)
50 {
51 int saved;
52
53 if (unlikely(!rt)) return;
54 saved = rt->implementation_private;
55 pmf_gpio_set_headphone(rt, 0);
56 pmf_gpio_set_amp(rt, 0);
57 pmf_gpio_set_lineout(rt, 0);
58 rt->implementation_private = saved;
59 }
60
pmf_gpio_all_amps_restore(struct gpio_runtime * rt)61 static void pmf_gpio_all_amps_restore(struct gpio_runtime *rt)
62 {
63 int s;
64
65 if (unlikely(!rt)) return;
66 s = rt->implementation_private;
67 pmf_gpio_set_headphone(rt, (s>>0)&1);
68 pmf_gpio_set_amp(rt, (s>>1)&1);
69 pmf_gpio_set_lineout(rt, (s>>2)&1);
70 }
71
pmf_handle_notify(struct work_struct * work)72 static void pmf_handle_notify(struct work_struct *work)
73 {
74 struct gpio_notification *notif =
75 container_of(work, struct gpio_notification, work.work);
76
77 mutex_lock(¬if->mutex);
78 if (notif->notify)
79 notif->notify(notif->data);
80 mutex_unlock(¬if->mutex);
81 }
82
pmf_gpio_init(struct gpio_runtime * rt)83 static void pmf_gpio_init(struct gpio_runtime *rt)
84 {
85 pmf_gpio_all_amps_off(rt);
86 rt->implementation_private = 0;
87 INIT_DELAYED_WORK(&rt->headphone_notify.work, pmf_handle_notify);
88 INIT_DELAYED_WORK(&rt->line_in_notify.work, pmf_handle_notify);
89 INIT_DELAYED_WORK(&rt->line_out_notify.work, pmf_handle_notify);
90 mutex_init(&rt->headphone_notify.mutex);
91 mutex_init(&rt->line_in_notify.mutex);
92 mutex_init(&rt->line_out_notify.mutex);
93 }
94
pmf_gpio_exit(struct gpio_runtime * rt)95 static void pmf_gpio_exit(struct gpio_runtime *rt)
96 {
97 pmf_gpio_all_amps_off(rt);
98 rt->implementation_private = 0;
99
100 if (rt->headphone_notify.gpio_private)
101 pmf_unregister_irq_client(rt->headphone_notify.gpio_private);
102 if (rt->line_in_notify.gpio_private)
103 pmf_unregister_irq_client(rt->line_in_notify.gpio_private);
104 if (rt->line_out_notify.gpio_private)
105 pmf_unregister_irq_client(rt->line_out_notify.gpio_private);
106
107 /* make sure no work is pending before freeing
108 * all things */
109 cancel_delayed_work_sync(&rt->headphone_notify.work);
110 cancel_delayed_work_sync(&rt->line_in_notify.work);
111 cancel_delayed_work_sync(&rt->line_out_notify.work);
112
113 mutex_destroy(&rt->headphone_notify.mutex);
114 mutex_destroy(&rt->line_in_notify.mutex);
115 mutex_destroy(&rt->line_out_notify.mutex);
116
117 kfree(rt->headphone_notify.gpio_private);
118 kfree(rt->line_in_notify.gpio_private);
119 kfree(rt->line_out_notify.gpio_private);
120 }
121
pmf_handle_notify_irq(void * data)122 static void pmf_handle_notify_irq(void *data)
123 {
124 struct gpio_notification *notif = data;
125
126 schedule_delayed_work(¬if->work, 0);
127 }
128
pmf_set_notify(struct gpio_runtime * rt,enum notify_type type,notify_func_t notify,void * data)129 static int pmf_set_notify(struct gpio_runtime *rt,
130 enum notify_type type,
131 notify_func_t notify,
132 void *data)
133 {
134 struct gpio_notification *notif;
135 notify_func_t old;
136 struct pmf_irq_client *irq_client;
137 char *name;
138 int err = -EBUSY;
139
140 switch (type) {
141 case AOA_NOTIFY_HEADPHONE:
142 notif = &rt->headphone_notify;
143 name = "headphone-detect";
144 break;
145 case AOA_NOTIFY_LINE_IN:
146 notif = &rt->line_in_notify;
147 name = "linein-detect";
148 break;
149 case AOA_NOTIFY_LINE_OUT:
150 notif = &rt->line_out_notify;
151 name = "lineout-detect";
152 break;
153 default:
154 return -EINVAL;
155 }
156
157 mutex_lock(¬if->mutex);
158
159 old = notif->notify;
160
161 if (!old && !notify) {
162 err = 0;
163 goto out_unlock;
164 }
165
166 if (old && notify) {
167 if (old == notify && notif->data == data)
168 err = 0;
169 goto out_unlock;
170 }
171
172 if (old && !notify) {
173 irq_client = notif->gpio_private;
174 pmf_unregister_irq_client(irq_client);
175 kfree(irq_client);
176 notif->gpio_private = NULL;
177 }
178 if (!old && notify) {
179 irq_client = kzalloc(sizeof(struct pmf_irq_client),
180 GFP_KERNEL);
181 if (!irq_client) {
182 err = -ENOMEM;
183 goto out_unlock;
184 }
185 irq_client->data = notif;
186 irq_client->handler = pmf_handle_notify_irq;
187 irq_client->owner = THIS_MODULE;
188 err = pmf_register_irq_client(rt->node,
189 name,
190 irq_client);
191 if (err) {
192 printk(KERN_ERR "snd-aoa: gpio layer failed to"
193 " register %s irq (%d)\n", name, err);
194 kfree(irq_client);
195 goto out_unlock;
196 }
197 notif->gpio_private = irq_client;
198 }
199 notif->notify = notify;
200 notif->data = data;
201
202 err = 0;
203 out_unlock:
204 mutex_unlock(¬if->mutex);
205 return err;
206 }
207
pmf_get_detect(struct gpio_runtime * rt,enum notify_type type)208 static int pmf_get_detect(struct gpio_runtime *rt,
209 enum notify_type type)
210 {
211 char *name;
212 int err = -EBUSY, ret;
213 struct pmf_args args = { .count = 1, .u[0].p = &ret };
214
215 switch (type) {
216 case AOA_NOTIFY_HEADPHONE:
217 name = "headphone-detect";
218 break;
219 case AOA_NOTIFY_LINE_IN:
220 name = "linein-detect";
221 break;
222 case AOA_NOTIFY_LINE_OUT:
223 name = "lineout-detect";
224 break;
225 default:
226 return -EINVAL;
227 }
228
229 err = pmf_call_function(rt->node, name, &args);
230 if (err)
231 return err;
232 return ret;
233 }
234
235 static struct gpio_methods methods = {
236 .init = pmf_gpio_init,
237 .exit = pmf_gpio_exit,
238 .all_amps_off = pmf_gpio_all_amps_off,
239 .all_amps_restore = pmf_gpio_all_amps_restore,
240 .set_headphone = pmf_gpio_set_headphone,
241 .set_speakers = pmf_gpio_set_amp,
242 .set_lineout = pmf_gpio_set_lineout,
243 .set_hw_reset = pmf_gpio_set_hw_reset,
244 .get_headphone = pmf_gpio_get_headphone,
245 .get_speakers = pmf_gpio_get_amp,
246 .get_lineout = pmf_gpio_get_lineout,
247 .set_notify = pmf_set_notify,
248 .get_detect = pmf_get_detect,
249 };
250
251 struct gpio_methods *pmf_gpio_methods = &methods;
252 EXPORT_SYMBOL_GPL(pmf_gpio_methods);
253