2 * Copyright 2011 Red Hat Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
25 #include <subdev/gpio.h>
26 #include <subdev/bios.h>
27 #include <subdev/bios/gpio.h>
30 nouveau_gpio_drive(struct nouveau_gpio *gpio,
31 int idx, int line, int dir, int out)
33 return gpio->drive ? gpio->drive(gpio, line, dir, out) : -ENODEV;
37 nouveau_gpio_sense(struct nouveau_gpio *gpio, int idx, int line)
39 return gpio->sense ? gpio->sense(gpio, line) : -ENODEV;
43 nouveau_gpio_find(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line,
44 struct dcb_gpio_func *func)
46 struct nouveau_bios *bios = nouveau_bios(gpio);
50 if (line == 0xff && tag == 0xff)
53 data = dcb_gpio_match(bios, idx, tag, line, &ver, &len, func);
57 /* Apple iMac G4 NV18 */
58 if (nv_device_match(nv_object(gpio), 0x0189, 0x10de, 0x0010)) {
59 if (tag == DCB_GPIO_TVDAC0) {
60 *func = (struct dcb_gpio_func) {
61 .func = DCB_GPIO_TVDAC0,
74 nouveau_gpio_set(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line, int state)
76 struct dcb_gpio_func func;
79 ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
81 int dir = !!(func.log[state] & 0x02);
82 int out = !!(func.log[state] & 0x01);
83 ret = nouveau_gpio_drive(gpio, idx, func.line, dir, out);
90 nouveau_gpio_get(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line)
92 struct dcb_gpio_func func;
95 ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
97 ret = nouveau_gpio_sense(gpio, idx, func.line);
99 ret = (ret == (func.log[1] & 1));
106 nouveau_gpio_irq(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line, bool on)
108 struct dcb_gpio_func func;
111 ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
113 if (idx == 0 && gpio->irq_enable)
114 gpio->irq_enable(gpio, func.line, on);
123 struct nouveau_gpio *gpio;
124 struct list_head head;
125 struct work_struct work;
127 struct dcb_gpio_func func;
128 void (*handler)(void *, int);
134 nouveau_gpio_isr_bh(struct work_struct *work)
136 struct gpio_isr *isr = container_of(work, struct gpio_isr, work);
137 struct nouveau_gpio *gpio = isr->gpio;
141 state = nouveau_gpio_get(gpio, isr->idx, isr->func.func,
144 isr->handler(isr->data, state);
146 spin_lock_irqsave(&gpio->lock, flags);
147 isr->inhibit = false;
148 spin_unlock_irqrestore(&gpio->lock, flags);
152 nouveau_gpio_isr_run(struct nouveau_gpio *gpio, int idx, u32 line_mask)
154 struct gpio_isr *isr;
159 spin_lock(&gpio->lock);
160 list_for_each_entry(isr, &gpio->isr, head) {
161 if (line_mask & (1 << isr->func.line)) {
165 schedule_work(&isr->work);
168 spin_unlock(&gpio->lock);
172 nouveau_gpio_isr_add(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line,
173 void (*handler)(void *, int), void *data)
175 struct gpio_isr *isr;
179 isr = kzalloc(sizeof(*isr), GFP_KERNEL);
183 ret = nouveau_gpio_find(gpio, idx, tag, line, &isr->func);
189 INIT_WORK(&isr->work, nouveau_gpio_isr_bh);
191 isr->handler = handler;
195 spin_lock_irqsave(&gpio->lock, flags);
196 list_add(&isr->head, &gpio->isr);
197 spin_unlock_irqrestore(&gpio->lock, flags);
202 nouveau_gpio_isr_del(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line,
203 void (*handler)(void *, int), void *data)
205 struct gpio_isr *isr, *tmp;
206 struct dcb_gpio_func func;
211 ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
213 spin_lock_irqsave(&gpio->lock, flags);
214 list_for_each_entry_safe(isr, tmp, &gpio->isr, head) {
215 if (memcmp(&isr->func, &func, sizeof(func)) ||
217 isr->handler != handler || isr->data != data)
219 list_move_tail(&isr->head, &tofree);
221 spin_unlock_irqrestore(&gpio->lock, flags);
223 list_for_each_entry_safe(isr, tmp, &tofree, head) {
224 flush_work(&isr->work);
231 nouveau_gpio_create_(struct nouveau_object *parent,
232 struct nouveau_object *engine,
233 struct nouveau_oclass *oclass, int length, void **pobject)
235 struct nouveau_gpio *gpio;
238 ret = nouveau_subdev_create_(parent, engine, oclass, 0, "GPIO", "gpio",
244 gpio->find = nouveau_gpio_find;
245 gpio->set = nouveau_gpio_set;
246 gpio->get = nouveau_gpio_get;
247 gpio->irq = nouveau_gpio_irq;
248 gpio->isr_run = nouveau_gpio_isr_run;
249 gpio->isr_add = nouveau_gpio_isr_add;
250 gpio->isr_del = nouveau_gpio_isr_del;
251 INIT_LIST_HEAD(&gpio->isr);
252 spin_lock_init(&gpio->lock);
256 static struct dmi_system_id gpio_reset_ids[] = {
258 .ident = "Apple Macbook 10,1",
260 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
261 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro10,1"),
268 nouveau_gpio_init(struct nouveau_gpio *gpio)
270 int ret = nouveau_subdev_init(&gpio->base);
271 if (ret == 0 && gpio->reset) {
272 if (dmi_check_system(gpio_reset_ids))