2 * wm8994-irq.c -- Interrupt controller support for Wolfson WM8994
4 * Copyright 2010 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/i2c.h>
18 #include <linux/irq.h>
19 #include <linux/mfd/core.h>
20 #include <linux/interrupt.h>
22 #include <linux/mfd/wm8994/core.h>
23 #include <linux/mfd/wm8994/registers.h>
25 #include <linux/delay.h>
27 struct wm8994_irq_data {
32 static struct wm8994_irq_data wm8994_irqs[] = {
33 [WM8994_IRQ_TEMP_SHUT] = {
35 .mask = WM8994_TEMP_SHUT_EINT,
37 [WM8994_IRQ_MIC1_DET] = {
39 .mask = WM8994_MIC1_DET_EINT,
41 [WM8994_IRQ_MIC1_SHRT] = {
43 .mask = WM8994_MIC1_SHRT_EINT,
45 [WM8994_IRQ_MIC2_DET] = {
47 .mask = WM8994_MIC2_DET_EINT,
49 [WM8994_IRQ_MIC2_SHRT] = {
51 .mask = WM8994_MIC2_SHRT_EINT,
53 [WM8994_IRQ_FLL1_LOCK] = {
55 .mask = WM8994_FLL1_LOCK_EINT,
57 [WM8994_IRQ_FLL2_LOCK] = {
59 .mask = WM8994_FLL2_LOCK_EINT,
61 [WM8994_IRQ_SRC1_LOCK] = {
63 .mask = WM8994_SRC1_LOCK_EINT,
65 [WM8994_IRQ_SRC2_LOCK] = {
67 .mask = WM8994_SRC2_LOCK_EINT,
69 [WM8994_IRQ_AIF1DRC1_SIG_DET] = {
71 .mask = WM8994_AIF1DRC1_SIG_DET,
73 [WM8994_IRQ_AIF1DRC2_SIG_DET] = {
75 .mask = WM8994_AIF1DRC2_SIG_DET_EINT,
77 [WM8994_IRQ_AIF2DRC_SIG_DET] = {
79 .mask = WM8994_AIF2DRC_SIG_DET_EINT,
81 [WM8994_IRQ_FIFOS_ERR] = {
83 .mask = WM8994_FIFOS_ERR_EINT,
85 [WM8994_IRQ_WSEQ_DONE] = {
87 .mask = WM8994_WSEQ_DONE_EINT,
89 [WM8994_IRQ_DCS_DONE] = {
91 .mask = WM8994_DCS_DONE_EINT,
93 [WM8994_IRQ_TEMP_WARN] = {
95 .mask = WM8994_TEMP_WARN_EINT,
97 [WM8994_IRQ_GPIO(1)] = {
99 .mask = WM8994_GP1_EINT,
101 [WM8994_IRQ_GPIO(2)] = {
103 .mask = WM8994_GP2_EINT,
105 [WM8994_IRQ_GPIO(3)] = {
107 .mask = WM8994_GP3_EINT,
109 [WM8994_IRQ_GPIO(4)] = {
111 .mask = WM8994_GP4_EINT,
113 [WM8994_IRQ_GPIO(5)] = {
115 .mask = WM8994_GP5_EINT,
117 [WM8994_IRQ_GPIO(6)] = {
119 .mask = WM8994_GP6_EINT,
121 [WM8994_IRQ_GPIO(7)] = {
123 .mask = WM8994_GP7_EINT,
125 [WM8994_IRQ_GPIO(8)] = {
127 .mask = WM8994_GP8_EINT,
129 [WM8994_IRQ_GPIO(9)] = {
131 .mask = WM8994_GP8_EINT,
133 [WM8994_IRQ_GPIO(10)] = {
135 .mask = WM8994_GP10_EINT,
137 [WM8994_IRQ_GPIO(11)] = {
139 .mask = WM8994_GP11_EINT,
143 static inline int irq_data_to_status_reg(struct wm8994_irq_data *irq_data)
145 return WM8994_INTERRUPT_STATUS_1 - 1 + irq_data->reg;
148 static inline int irq_data_to_mask_reg(struct wm8994_irq_data *irq_data)
150 return WM8994_INTERRUPT_STATUS_1_MASK - 1 + irq_data->reg;
153 static inline struct wm8994_irq_data *irq_to_wm8994_irq(struct wm8994 *wm8994,
156 return &wm8994_irqs[irq - wm8994->irq_base];
159 static void wm8994_irq_lock(struct irq_data *data)
161 struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
163 mutex_lock(&wm8994->irq_lock);
166 static void wm8994_irq_sync_unlock(struct irq_data *data)
168 struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
171 for (i = 0; i < ARRAY_SIZE(wm8994->irq_masks_cur); i++) {
172 /* If there's been a change in the mask write it back
173 * to the hardware. */
174 if (wm8994->irq_masks_cur[i] != wm8994->irq_masks_cache[i]) {
175 wm8994->irq_masks_cache[i] = wm8994->irq_masks_cur[i];
176 wm8994_reg_write(wm8994,
177 WM8994_INTERRUPT_STATUS_1_MASK + i,
178 wm8994->irq_masks_cur[i]);
182 mutex_unlock(&wm8994->irq_lock);
185 static void wm8994_irq_enable(struct irq_data *data)
187 struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
188 struct wm8994_irq_data *irq_data = irq_to_wm8994_irq(wm8994,
191 wm8994->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
194 static void wm8994_irq_disable(struct irq_data *data)
196 struct wm8994 *wm8994 = irq_data_get_irq_chip_data(data);
197 struct wm8994_irq_data *irq_data = irq_to_wm8994_irq(wm8994,
200 wm8994->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
203 static struct irq_chip wm8994_irq_chip = {
205 .irq_bus_lock = wm8994_irq_lock,
206 .irq_bus_sync_unlock = wm8994_irq_sync_unlock,
207 .irq_disable = wm8994_irq_disable,
208 .irq_enable = wm8994_irq_enable,
211 /* The processing of the primary interrupt occurs in a thread so that
212 * we can interact with the device over I2C or SPI. */
213 static irqreturn_t wm8994_irq_thread(int irq, void *data)
215 struct wm8994 *wm8994 = data;
217 u16 status[WM8994_NUM_IRQ_REGS];
220 ret = wm8994_bulk_read(wm8994, WM8994_INTERRUPT_STATUS_1,
221 WM8994_NUM_IRQ_REGS, status);
223 dev_err(wm8994->dev, "Failed to read interrupt status: %d\n",
228 /* Bit swap and apply masking */
229 for (i = 0; i < WM8994_NUM_IRQ_REGS; i++) {
230 status[i] = be16_to_cpu(status[i]);
231 status[i] &= ~wm8994->irq_masks_cur[i];
234 /* Ack any unmasked IRQs */
235 for (i = 0; i < ARRAY_SIZE(status); i++) {
237 wm8994_reg_write(wm8994, WM8994_INTERRUPT_STATUS_1 + i,
242 for (i = 0; i < ARRAY_SIZE(wm8994_irqs); i++) {
243 if (status[wm8994_irqs[i].reg - 1] & wm8994_irqs[i].mask)
244 handle_nested_irq(wm8994->irq_base + i);
250 int wm8994_irq_init(struct wm8994 *wm8994)
254 mutex_init(&wm8994->irq_lock);
256 /* Mask the individual interrupt sources */
257 for (i = 0; i < ARRAY_SIZE(wm8994->irq_masks_cur); i++) {
258 wm8994->irq_masks_cur[i] = 0xffff;
259 wm8994->irq_masks_cache[i] = 0xffff;
260 wm8994_reg_write(wm8994, WM8994_INTERRUPT_STATUS_1_MASK + i,
265 dev_warn(wm8994->dev,
266 "No interrupt specified, no interrupts\n");
267 wm8994->irq_base = 0;
271 if (!wm8994->irq_base) {
273 "No interrupt base specified, no interrupts\n");
277 /* Register them with genirq */
278 for (cur_irq = wm8994->irq_base;
279 cur_irq < ARRAY_SIZE(wm8994_irqs) + wm8994->irq_base;
281 irq_set_chip_data(cur_irq, wm8994);
282 irq_set_chip_and_handler(cur_irq, &wm8994_irq_chip,
284 irq_set_nested_thread(cur_irq, 1);
286 /* ARM needs us to explicitly flag the IRQ as valid
287 * and will set them noprobe when we do so. */
289 set_irq_flags(cur_irq, IRQF_VALID);
291 irq_set_noprobe(cur_irq);
295 ret = request_threaded_irq(wm8994->irq, NULL, wm8994_irq_thread,
296 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
299 dev_err(wm8994->dev, "Failed to request IRQ %d: %d\n",
304 /* Enable top level interrupt if it was masked */
305 wm8994_reg_write(wm8994, WM8994_INTERRUPT_CONTROL, 0);
310 void wm8994_irq_exit(struct wm8994 *wm8994)
313 free_irq(wm8994->irq, wm8994);