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1/*
2 * Power button driver for Medfield.
3 *
4 * Copyright (C) 2010 Intel Corp
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
18 */
19
20#include <linux/module.h>
21#include <linux/init.h>
22#include <linux/interrupt.h>
23#include <linux/slab.h>
24#include <linux/platform_device.h>
25#include <linux/input.h>
26
27#include <asm/intel_scu_ipc.h>
28
29#define DRIVER_NAME "msic_power_btn"
30
31#define MSIC_PB_STATUS 0x3f
32#define MSIC_PB_LEVEL (1 << 3) /* 1 - release, 0 - press */
33
34static irqreturn_t mfld_pb_isr(int irq, void *dev_id)
35{
36 struct input_dev *input = dev_id;
37 int ret;
38 u8 pbstat;
39
40 ret = intel_scu_ipc_ioread8(MSIC_PB_STATUS, &pbstat);
41 if (ret < 0) {
42 dev_err(input->dev.parent, "Read error %d while reading"
43 " MSIC_PB_STATUS\n", ret);
44 } else {
45 input_event(input, EV_KEY, KEY_POWER,
46 !(pbstat & MSIC_PB_LEVEL));
47 input_sync(input);
48 }
49
50 return IRQ_HANDLED;
51}
52
53static int __devinit mfld_pb_probe(struct platform_device *pdev)
54{
55 struct input_dev *input;
56 int irq = platform_get_irq(pdev, 0);
57 int error;
58
59 if (irq < 0)
60 return -EINVAL;
61
62 input = input_allocate_device();
63 if (!input) {
64 dev_err(&pdev->dev, "Input device allocation error\n");
65 return -ENOMEM;
66 }
67
68 input->name = pdev->name;
69 input->phys = "power-button/input0";
70 input->id.bustype = BUS_HOST;
71 input->dev.parent = &pdev->dev;
72
73 input_set_capability(input, EV_KEY, KEY_POWER);
74
75 error = request_threaded_irq(irq, NULL, mfld_pb_isr, 0,
76 DRIVER_NAME, input);
77 if (error) {
78 dev_err(&pdev->dev, "Unable to request irq %d for mfld power"
79 "button\n", irq);
80 goto err_free_input;
81 }
82
83 error = input_register_device(input);
84 if (error) {
85 dev_err(&pdev->dev, "Unable to register input dev, error "
86 "%d\n", error);
87 goto err_free_irq;
88 }
89
90 platform_set_drvdata(pdev, input);
91 return 0;
92
93err_free_irq:
94 free_irq(irq, input);
95err_free_input:
96 input_free_device(input);
97 return error;
98}
99
100static int __devexit mfld_pb_remove(struct platform_device *pdev)
101{
102 struct input_dev *input = platform_get_drvdata(pdev);
103 int irq = platform_get_irq(pdev, 0);
104
105 free_irq(irq, input);
106 input_unregister_device(input);
107 platform_set_drvdata(pdev, NULL);
108
109 return 0;
110}
111
112static struct platform_driver mfld_pb_driver = {
113 .driver = {
114 .name = DRIVER_NAME,
115 .owner = THIS_MODULE,
116 },
117 .probe = mfld_pb_probe,
118 .remove = __devexit_p(mfld_pb_remove),
119};
120
121static int __init mfld_pb_init(void)
122{
123 return platform_driver_register(&mfld_pb_driver);
124}
125module_init(mfld_pb_init);
126
127static void __exit mfld_pb_exit(void)
128{
129 platform_driver_unregister(&mfld_pb_driver);
130}
131module_exit(mfld_pb_exit);
132
133MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>");
134MODULE_DESCRIPTION("Intel Medfield Power Button Driver");
135MODULE_LICENSE("GPL v2");
136MODULE_ALIAS("platform:" DRIVER_NAME);
1/*
2 * Power button driver for Intel MID platforms.
3 *
4 * Copyright (C) 2010,2017 Intel Corp
5 *
6 * Author: Hong Liu <hong.liu@intel.com>
7 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 */
18
19#include <linux/init.h>
20#include <linux/input.h>
21#include <linux/interrupt.h>
22#include <linux/mfd/intel_msic.h>
23#include <linux/module.h>
24#include <linux/platform_device.h>
25#include <linux/pm_wakeirq.h>
26#include <linux/slab.h>
27
28#include <asm/cpu_device_id.h>
29#include <asm/intel-family.h>
30#include <asm/intel_scu_ipc.h>
31
32#define DRIVER_NAME "msic_power_btn"
33
34#define MSIC_PB_LEVEL (1 << 3) /* 1 - release, 0 - press */
35
36/*
37 * MSIC document ti_datasheet defines the 1st bit reg 0x21 is used to mask
38 * power button interrupt
39 */
40#define MSIC_PWRBTNM (1 << 0)
41
42/* Intel Tangier */
43#define BCOVE_PB_LEVEL (1 << 4) /* 1 - release, 0 - press */
44
45/* Basin Cove PMIC */
46#define BCOVE_PBIRQ 0x02
47#define BCOVE_IRQLVL1MSK 0x0c
48#define BCOVE_PBIRQMASK 0x0d
49#define BCOVE_PBSTATUS 0x27
50
51struct mid_pb_ddata {
52 struct device *dev;
53 int irq;
54 struct input_dev *input;
55 unsigned short mirqlvl1_addr;
56 unsigned short pbstat_addr;
57 u8 pbstat_mask;
58 int (*setup)(struct mid_pb_ddata *ddata);
59};
60
61static int mid_pbstat(struct mid_pb_ddata *ddata, int *value)
62{
63 struct input_dev *input = ddata->input;
64 int ret;
65 u8 pbstat;
66
67 ret = intel_scu_ipc_ioread8(ddata->pbstat_addr, &pbstat);
68 if (ret)
69 return ret;
70
71 dev_dbg(input->dev.parent, "PB_INT status= %d\n", pbstat);
72
73 *value = !(pbstat & ddata->pbstat_mask);
74 return 0;
75}
76
77static int mid_irq_ack(struct mid_pb_ddata *ddata)
78{
79 return intel_scu_ipc_update_register(ddata->mirqlvl1_addr, 0, MSIC_PWRBTNM);
80}
81
82static int mrfld_setup(struct mid_pb_ddata *ddata)
83{
84 /* Unmask the PBIRQ and MPBIRQ on Tangier */
85 intel_scu_ipc_update_register(BCOVE_PBIRQ, 0, MSIC_PWRBTNM);
86 intel_scu_ipc_update_register(BCOVE_PBIRQMASK, 0, MSIC_PWRBTNM);
87
88 return 0;
89}
90
91static irqreturn_t mid_pb_isr(int irq, void *dev_id)
92{
93 struct mid_pb_ddata *ddata = dev_id;
94 struct input_dev *input = ddata->input;
95 int value = 0;
96 int ret;
97
98 ret = mid_pbstat(ddata, &value);
99 if (ret < 0) {
100 dev_err(input->dev.parent,
101 "Read error %d while reading MSIC_PB_STATUS\n", ret);
102 } else {
103 input_event(input, EV_KEY, KEY_POWER, value);
104 input_sync(input);
105 }
106
107 mid_irq_ack(ddata);
108 return IRQ_HANDLED;
109}
110
111static const struct mid_pb_ddata mfld_ddata = {
112 .mirqlvl1_addr = INTEL_MSIC_IRQLVL1MSK,
113 .pbstat_addr = INTEL_MSIC_PBSTATUS,
114 .pbstat_mask = MSIC_PB_LEVEL,
115};
116
117static const struct mid_pb_ddata mrfld_ddata = {
118 .mirqlvl1_addr = BCOVE_IRQLVL1MSK,
119 .pbstat_addr = BCOVE_PBSTATUS,
120 .pbstat_mask = BCOVE_PB_LEVEL,
121 .setup = mrfld_setup,
122};
123
124#define ICPU(model, ddata) \
125 { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (kernel_ulong_t)&ddata }
126
127static const struct x86_cpu_id mid_pb_cpu_ids[] = {
128 ICPU(INTEL_FAM6_ATOM_PENWELL, mfld_ddata),
129 ICPU(INTEL_FAM6_ATOM_MERRIFIELD, mrfld_ddata),
130 {}
131};
132
133static int mid_pb_probe(struct platform_device *pdev)
134{
135 const struct x86_cpu_id *id;
136 struct mid_pb_ddata *ddata;
137 struct input_dev *input;
138 int irq = platform_get_irq(pdev, 0);
139 int error;
140
141 id = x86_match_cpu(mid_pb_cpu_ids);
142 if (!id)
143 return -ENODEV;
144
145 if (irq < 0) {
146 dev_err(&pdev->dev, "Failed to get IRQ: %d\n", irq);
147 return irq;
148 }
149
150 input = devm_input_allocate_device(&pdev->dev);
151 if (!input)
152 return -ENOMEM;
153
154 input->name = pdev->name;
155 input->phys = "power-button/input0";
156 input->id.bustype = BUS_HOST;
157 input->dev.parent = &pdev->dev;
158
159 input_set_capability(input, EV_KEY, KEY_POWER);
160
161 ddata = (struct mid_pb_ddata *)id->driver_data;
162 if (!ddata)
163 return -ENODATA;
164
165 ddata->dev = &pdev->dev;
166 ddata->irq = irq;
167 ddata->input = input;
168
169 if (ddata->setup) {
170 error = ddata->setup(ddata);
171 if (error)
172 return error;
173 }
174
175 error = devm_request_threaded_irq(&pdev->dev, irq, NULL, mid_pb_isr,
176 IRQF_ONESHOT, DRIVER_NAME, ddata);
177 if (error) {
178 dev_err(&pdev->dev,
179 "Unable to request irq %d for MID power button\n", irq);
180 return error;
181 }
182
183 error = input_register_device(input);
184 if (error) {
185 dev_err(&pdev->dev,
186 "Unable to register input dev, error %d\n", error);
187 return error;
188 }
189
190 platform_set_drvdata(pdev, ddata);
191
192 /*
193 * SCU firmware might send power button interrupts to IA core before
194 * kernel boots and doesn't get EOI from IA core. The first bit of
195 * MSIC reg 0x21 is kept masked, and SCU firmware doesn't send new
196 * power interrupt to Android kernel. Unmask the bit when probing
197 * power button in kernel.
198 * There is a very narrow race between irq handler and power button
199 * initialization. The race happens rarely. So we needn't worry
200 * about it.
201 */
202 error = mid_irq_ack(ddata);
203 if (error) {
204 dev_err(&pdev->dev,
205 "Unable to clear power button interrupt, error: %d\n",
206 error);
207 return error;
208 }
209
210 device_init_wakeup(&pdev->dev, true);
211 dev_pm_set_wake_irq(&pdev->dev, irq);
212
213 return 0;
214}
215
216static int mid_pb_remove(struct platform_device *pdev)
217{
218 dev_pm_clear_wake_irq(&pdev->dev);
219 device_init_wakeup(&pdev->dev, false);
220
221 return 0;
222}
223
224static struct platform_driver mid_pb_driver = {
225 .driver = {
226 .name = DRIVER_NAME,
227 },
228 .probe = mid_pb_probe,
229 .remove = mid_pb_remove,
230};
231
232module_platform_driver(mid_pb_driver);
233
234MODULE_AUTHOR("Hong Liu <hong.liu@intel.com>");
235MODULE_DESCRIPTION("Intel MID Power Button Driver");
236MODULE_LICENSE("GPL v2");
237MODULE_ALIAS("platform:" DRIVER_NAME);