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 if (line == 0xff && tag == 0xff)
49 if (!dcb_gpio_parse(nouveau_bios(gpio), idx, tag, line, func))
52 /* Apple iMac G4 NV18 */
53 if (nv_device_match(nv_object(gpio), 0x0189, 0x10de, 0x0010)) {
54 if (tag == DCB_GPIO_TVDAC0) {
55 *func = (struct dcb_gpio_func) {
56 .func = DCB_GPIO_TVDAC0,
69 nouveau_gpio_set(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line, int state)
71 struct dcb_gpio_func func;
74 ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
76 int dir = !!(func.log[state] & 0x02);
77 int out = !!(func.log[state] & 0x01);
78 ret = nouveau_gpio_drive(gpio, idx, func.line, dir, out);
85 nouveau_gpio_get(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line)
87 struct dcb_gpio_func func;
90 ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
92 ret = nouveau_gpio_sense(gpio, idx, func.line);
94 ret = (ret == (func.log[1] & 1));
101 nouveau_gpio_irq(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line, bool on)
103 struct dcb_gpio_func func;
106 ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
108 if (idx == 0 && gpio->irq_enable)
109 gpio->irq_enable(gpio, func.line, on);
118 struct nouveau_gpio *gpio;
119 struct list_head head;
120 struct work_struct work;
122 struct dcb_gpio_func func;
123 void (*handler)(void *, int);
129 nouveau_gpio_isr_bh(struct work_struct *work)
131 struct gpio_isr *isr = container_of(work, struct gpio_isr, work);
132 struct nouveau_gpio *gpio = isr->gpio;
136 state = nouveau_gpio_get(gpio, isr->idx, isr->func.func,
139 isr->handler(isr->data, state);
141 spin_lock_irqsave(&gpio->lock, flags);
142 isr->inhibit = false;
143 spin_unlock_irqrestore(&gpio->lock, flags);
147 nouveau_gpio_isr_run(struct nouveau_gpio *gpio, int idx, u32 line_mask)
149 struct gpio_isr *isr;
154 spin_lock(&gpio->lock);
155 list_for_each_entry(isr, &gpio->isr, head) {
156 if (line_mask & (1 << isr->func.line)) {
160 schedule_work(&isr->work);
163 spin_unlock(&gpio->lock);
167 nouveau_gpio_isr_add(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line,
168 void (*handler)(void *, int), void *data)
170 struct gpio_isr *isr;
174 isr = kzalloc(sizeof(*isr), GFP_KERNEL);
178 ret = nouveau_gpio_find(gpio, idx, tag, line, &isr->func);
184 INIT_WORK(&isr->work, nouveau_gpio_isr_bh);
186 isr->handler = handler;
190 spin_lock_irqsave(&gpio->lock, flags);
191 list_add(&isr->head, &gpio->isr);
192 spin_unlock_irqrestore(&gpio->lock, flags);
197 nouveau_gpio_isr_del(struct nouveau_gpio *gpio, int idx, u8 tag, u8 line,
198 void (*handler)(void *, int), void *data)
200 struct gpio_isr *isr, *tmp;
201 struct dcb_gpio_func func;
206 ret = nouveau_gpio_find(gpio, idx, tag, line, &func);
208 spin_lock_irqsave(&gpio->lock, flags);
209 list_for_each_entry_safe(isr, tmp, &gpio->isr, head) {
210 if (memcmp(&isr->func, &func, sizeof(func)) ||
212 isr->handler != handler || isr->data != data)
214 list_move_tail(&isr->head, &tofree);
216 spin_unlock_irqrestore(&gpio->lock, flags);
218 list_for_each_entry_safe(isr, tmp, &tofree, head) {
219 flush_work(&isr->work);
226 nouveau_gpio_create_(struct nouveau_object *parent,
227 struct nouveau_object *engine,
228 struct nouveau_oclass *oclass, int length, void **pobject)
230 struct nouveau_gpio *gpio;
233 ret = nouveau_subdev_create_(parent, engine, oclass, 0, "GPIO", "gpio",
239 gpio->find = nouveau_gpio_find;
240 gpio->set = nouveau_gpio_set;
241 gpio->get = nouveau_gpio_get;
242 gpio->irq = nouveau_gpio_irq;
243 gpio->isr_run = nouveau_gpio_isr_run;
244 gpio->isr_add = nouveau_gpio_isr_add;
245 gpio->isr_del = nouveau_gpio_isr_del;
246 INIT_LIST_HEAD(&gpio->isr);
247 spin_lock_init(&gpio->lock);
251 static struct dmi_system_id gpio_reset_ids[] = {
253 .ident = "Apple Macbook 10,1",
255 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
256 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro10,1"),
263 nouveau_gpio_init(struct nouveau_gpio *gpio)
265 int ret = nouveau_subdev_init(&gpio->base);
266 if (ret == 0 && gpio->reset) {
267 if (dmi_check_system(gpio_reset_ids))