1 // SPDX-License-Identifier: GPL-2.0-only
3 * Fujitsu Lifebook Application Panel button drive
8 * Many Fujitsu Lifebook laptops have a small panel of buttons that are
9 * accessible via the i2c/smbus interface. This driver polls those
10 * buttons and generates input events.
12 * For more details see:
13 * http://apanel.sourceforge.net/tech.php
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/ioport.h>
20 #include <linux/input.h>
21 #include <linux/i2c.h>
22 #include <linux/leds.h>
24 #define APANEL_NAME "Fujitsu Application Panel"
25 #define APANEL "apanel"
27 /* How often we poll keys - msecs */
28 #define POLL_INTERVAL_DEFAULT 1000
30 /* Magic constants in BIOS that tell about buttons */
33 APANEL_DEV_APPBTN = 1,
48 /* Result of BIOS snooping/probing -- what features are supported */
49 static enum apanel_chip device_chip[APANEL_DEV_MAX];
51 #define MAX_PANEL_KEYS 12
54 struct input_dev *idev;
55 struct i2c_client *client;
56 unsigned short keymap[MAX_PANEL_KEYS];
58 struct led_classdev mail_led;
61 static const unsigned short apanel_keymap[MAX_PANEL_KEYS] = {
73 static void report_key(struct input_dev *input, unsigned keycode)
75 dev_dbg(input->dev.parent, "report key %#x\n", keycode);
76 input_report_key(input, keycode, 1);
79 input_report_key(input, keycode, 0);
83 /* Poll for key changes
85 * Read Application keys via SMI
86 * A (0x4), B (0x8), Internet (0x2), Email (0x1).
89 * Forward (0x100), Rewind (0x200), Stop (0x400), Pause (0x800)
91 static void apanel_poll(struct input_dev *idev)
93 struct apanel *ap = input_get_drvdata(idev);
94 u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
98 data = i2c_smbus_read_word_data(ap->client, cmd);
100 return; /* ignore errors (due to ACPI??) */
102 /* write back to clear latch */
103 i2c_smbus_write_word_data(ap->client, cmd, 0);
108 dev_dbg(&idev->dev, APANEL ": data %#x\n", data);
109 for (i = 0; i < idev->keycodemax; i++)
110 if ((1u << i) & data)
111 report_key(idev, ap->keymap[i]);
114 static int mail_led_set(struct led_classdev *led,
115 enum led_brightness value)
117 struct apanel *ap = container_of(led, struct apanel, mail_led);
118 u16 led_bits = value != LED_OFF ? 0x8000 : 0x0000;
120 return i2c_smbus_write_word_data(ap->client, 0x10, led_bits);
123 static int apanel_probe(struct i2c_client *client,
124 const struct i2c_device_id *id)
127 struct input_dev *idev;
128 u8 cmd = device_chip[APANEL_DEV_APPBTN] == CHIP_OZ992C ? 0 : 8;
131 ap = devm_kzalloc(&client->dev, sizeof(*ap), GFP_KERNEL);
135 idev = devm_input_allocate_device(&client->dev);
142 i2c_set_clientdata(client, ap);
144 err = i2c_smbus_write_word_data(client, cmd, 0);
146 dev_warn(&client->dev, "smbus write error %d\n", err);
150 input_set_drvdata(idev, ap);
152 idev->name = APANEL_NAME " buttons";
153 idev->phys = "apanel/input0";
154 idev->id.bustype = BUS_HOST;
156 memcpy(ap->keymap, apanel_keymap, sizeof(apanel_keymap));
157 idev->keycode = ap->keymap;
158 idev->keycodesize = sizeof(ap->keymap[0]);
159 idev->keycodemax = (device_chip[APANEL_DEV_CDBTN] != CHIP_NONE) ? 12 : 4;
161 set_bit(EV_KEY, idev->evbit);
162 for (i = 0; i < idev->keycodemax; i++)
164 set_bit(ap->keymap[i], idev->keybit);
166 err = input_setup_polling(idev, apanel_poll);
170 input_set_poll_interval(idev, POLL_INTERVAL_DEFAULT);
172 err = input_register_device(idev);
176 if (device_chip[APANEL_DEV_LED] != CHIP_NONE) {
177 ap->mail_led.name = "mail:blue";
178 ap->mail_led.brightness_set_blocking = mail_led_set;
179 err = devm_led_classdev_register(&client->dev, &ap->mail_led);
187 static void apanel_shutdown(struct i2c_client *client)
189 struct apanel *ap = i2c_get_clientdata(client);
191 if (device_chip[APANEL_DEV_LED] != CHIP_NONE)
192 led_set_brightness(&ap->mail_led, LED_OFF);
195 static const struct i2c_device_id apanel_id[] = {
196 { "fujitsu_apanel", 0 },
199 MODULE_DEVICE_TABLE(i2c, apanel_id);
201 static struct i2c_driver apanel_driver = {
205 .probe = apanel_probe,
206 .shutdown = apanel_shutdown,
207 .id_table = apanel_id,
210 /* Scan the system ROM for the signature "FJKEYINF" */
211 static __init const void __iomem *bios_signature(const void __iomem *bios)
214 const unsigned char signature[] = "FJKEYINF";
216 for (offset = 0; offset < 0x10000; offset += 0x10) {
217 if (check_signature(bios + offset, signature,
218 sizeof(signature)-1))
219 return bios + offset;
221 pr_notice(APANEL ": Fujitsu BIOS signature '%s' not found...\n",
226 static int __init apanel_init(void)
229 const void __iomem *p;
231 unsigned char i2c_addr;
234 bios = ioremap(0xF0000, 0x10000); /* Can't fail */
236 p = bios_signature(bios);
242 /* just use the first address */
244 i2c_addr = readb(p + 3) >> 1;
246 for ( ; (devno = readb(p)) & 0x7f; p += 4) {
247 unsigned char method, slave, chip;
249 method = readb(p + 1);
251 slave = readb(p + 3) >> 1;
253 if (slave != i2c_addr) {
254 pr_notice(APANEL ": only one SMBus slave "
255 "address supported, skipping device...\n");
259 /* translate alternative device numbers */
262 devno = APANEL_DEV_APPBTN;
265 devno = APANEL_DEV_LED;
269 if (devno >= APANEL_DEV_MAX)
270 pr_notice(APANEL ": unknown device %u found\n", devno);
271 else if (device_chip[devno] != CHIP_NONE)
272 pr_warn(APANEL ": duplicate entry for devno %u\n",
275 else if (method != 1 && method != 2 && method != 4) {
276 pr_notice(APANEL ": unknown method %u for devno %u\n",
279 device_chip[devno] = (enum apanel_chip) chip;
286 pr_info(APANEL ": no input devices reported by BIOS\n");
290 return i2c_add_driver(&apanel_driver);
292 module_init(apanel_init);
294 static void __exit apanel_cleanup(void)
296 i2c_del_driver(&apanel_driver);
298 module_exit(apanel_cleanup);
301 MODULE_DESCRIPTION(APANEL_NAME " driver");
302 MODULE_LICENSE("GPL");
304 MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifeBook*:pvr*:rvnFUJITSU:*");
305 MODULE_ALIAS("dmi:*:svnFUJITSU:pnLifebook*:pvr*:rvnFUJITSU:*");