Root/target/linux/xburst/patches-2.6.36/801-n526-lpc.patch

1From 626675b8f03f416a6b1c50f69dabb8a3f27b200a Mon Sep 17 00:00:00 2001
2From: Lars-Peter Clausen <lars@metafoo.de>
3Date: Wed, 12 May 2010 14:23:43 +0200
4Subject: [PATCH] Add n526 lpc driver
5
6---
7 drivers/misc/Kconfig | 9 ++
8 drivers/misc/Makefile | 1 +
9 drivers/misc/n526-lpc.c | 238 +++++++++++++++++++++++++++++++++++++++++++++++
10 3 files changed, 248 insertions(+), 0 deletions(-)
11 create mode 100644 drivers/misc/n526-lpc.c
12
13--- a/drivers/misc/Kconfig
14+++ b/drivers/misc/Kconfig
15@@ -398,6 +398,15 @@ config N516_LPC
16     help
17       N516 keyboard & power controller driver
18 
19+config N526_LPC
20+ tristate "N526 LPC934 coprocessor"
21+ depends on JZ4740_N526
22+ help
23+ If you say yes here you get support for the N526s NXP LPC934 coprocessor.
24+ It is used as a keyboard controllor and for power management.
25+
26+ If you have a N526 you probably want to say Y here.
27+
28 source "drivers/misc/c2port/Kconfig"
29 source "drivers/misc/eeprom/Kconfig"
30 source "drivers/misc/cb710/Kconfig"
31--- a/drivers/misc/Makefile
32+++ b/drivers/misc/Makefile
33@@ -36,3 +36,4 @@ obj-y += cb710/
34 obj-$(CONFIG_VMWARE_BALLOON) += vmw_balloon.o
35 obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o
36 obj-$(CONFIG_N516_LPC) += n516-lpc.o
37+obj-$(CONFIG_N526_LPC) += n526-lpc.o
38--- /dev/null
39+++ b/drivers/misc/n526-lpc.c
40@@ -0,0 +1,238 @@
41+/*
42+ * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de>
43+ *
44+ * This program is free software; you can redistribute it and/or modify
45+ * it under the terms of the GNU General Public License version 2 as
46+ * published by the Free Software Foundation.
47+ *
48+ * You should have received a copy of the GNU General Public License along
49+ * with this program; if not, write to the Free Software Foundation, Inc.,
50+ * 675 Mass Ave, Cambridge, MA 02139, USA.
51+ *
52+ */
53+
54+#include <linux/kernel.h>
55+#include <linux/module.h>
56+#include <linux/i2c.h>
57+#include <linux/input.h>
58+#include <linux/irq.h>
59+#include <linux/interrupt.h>
60+#include <linux/slab.h>
61+
62+#include <linux/workqueue.h>
63+
64+#include <asm/mach-jz4740/irq.h>
65+#include <asm/mach-jz4740/gpio.h>
66+
67+struct n526_lpc {
68+ struct i2c_client *client;
69+ struct input_dev *input;
70+
71+ struct work_struct work;
72+};
73+
74+static const unsigned int n526_lpc_keymap[] = {
75+ [0x01] = KEY_PAGEUP,
76+ [0x02] = KEY_PAGEDOWN,
77+ [0x03] = KEY_VOLUMEUP,
78+ [0x04] = KEY_VOLUMEDOWN,
79+ [0x06] = KEY_1,
80+ [0x07] = KEY_Q,
81+ [0x08] = KEY_A,
82+ [0x09] = KEY_Z,
83+ [0x0a] = KEY_LEFTSHIFT,
84+ [0x0b] = KEY_2,
85+ [0x0c] = KEY_W,
86+ [0x0d] = KEY_S,
87+ [0x0e] = KEY_X,
88+ [0x0f] = KEY_REFRESH,
89+ [0x10] = KEY_3,
90+ [0x11] = KEY_E,
91+ [0x12] = KEY_D,
92+ [0x13] = KEY_C,
93+ [0x14] = KEY_DOCUMENTS,
94+ [0x15] = KEY_4,
95+ [0x16] = KEY_R,
96+ [0x17] = KEY_F,
97+ [0x18] = KEY_V,
98+ [0x19] = KEY_MUTE,
99+ [0x1a] = KEY_5,
100+ [0x1b] = KEY_T,
101+ [0x1c] = KEY_G,
102+ [0x1d] = KEY_B,
103+ [0x1e] = KEY_DELETE,
104+ [0x1f] = KEY_6,
105+ [0x20] = KEY_Y,
106+ [0x21] = KEY_H,
107+ [0x22] = KEY_N,
108+ [0x23] = KEY_SPACE,
109+ [0x24] = KEY_7,
110+ [0x25] = KEY_U,
111+ [0x26] = KEY_J,
112+ [0x27] = KEY_M,
113+/* [0x28] = KEY_SYM, */
114+ [0x29] = KEY_8,
115+ [0x2a] = KEY_I,
116+ [0x2b] = KEY_K,
117+ [0x2c] = KEY_MENU,
118+ [0x2d] = KEY_LEFT,
119+ [0x2e] = KEY_9,
120+ [0x2f] = KEY_O,
121+ [0x30] = KEY_L,
122+ [0x31] = KEY_UP,
123+ [0x32] = KEY_DOWN,
124+ [0x33] = KEY_0,
125+ [0x34] = KEY_P,
126+ [0x35] = KEY_BACKSPACE,
127+ [0x36] = KEY_ENTER,
128+ [0x37] = KEY_RIGHT,
129+};
130+
131+static void n526_lpc_irq_work(struct work_struct *work)
132+{
133+ int ret;
134+ struct n526_lpc *n526_lpc = container_of(work, struct n526_lpc, work);
135+ struct i2c_client *client = n526_lpc->client;
136+ unsigned char raw_msg;
137+ struct i2c_msg msg = {client->addr, client->flags | I2C_M_RD, 1, &raw_msg};
138+ unsigned char keycode;
139+
140+
141+ ret = i2c_transfer(client->adapter, &msg, 1);
142+
143+ if (ret != 1) {
144+ dev_err(&client->dev, "Failed to read lpc status\n");
145+ }
146+
147+ keycode = raw_msg & 0x7f;
148+
149+ if (keycode < ARRAY_SIZE(n526_lpc_keymap)) {
150+ input_report_key(n526_lpc->input, n526_lpc_keymap[keycode],
151+ !(raw_msg & 0x80));
152+ input_sync(n526_lpc->input);
153+ }
154+}
155+
156+static irqreturn_t n526_lpc_irq(int irq, void *dev_id)
157+{
158+ struct n526_lpc *n526_lpc = dev_id;
159+
160+ schedule_work(&n526_lpc->work);
161+ return IRQ_HANDLED;
162+}
163+
164+static int __devinit n526_lpc_probe(struct i2c_client *client,
165+ const struct i2c_device_id *id)
166+{
167+ int ret;
168+ size_t i;
169+ struct n526_lpc *n526_lpc;
170+ struct input_dev *input;
171+
172+ n526_lpc = kmalloc(sizeof(*n526_lpc), GFP_KERNEL);
173+
174+ if (!n526_lpc) {
175+ dev_err(&client->dev, "Failed to allocate device structure\n");
176+ return -ENOMEM;
177+ }
178+
179+ input = input_allocate_device();
180+ if (!input) {
181+ dev_err(&client->dev, "Failed to allocate input device\n");
182+ ret = -ENOMEM;
183+ goto err_free;
184+ }
185+
186+ input->name = "n526-keys";
187+ input->phys = "n526-keys/input0";
188+ input->dev.parent = &client->dev;
189+ input->id.bustype = BUS_I2C;
190+ input->id.vendor = 0x0001;
191+ input->id.product = 0x0001;
192+ input->id.version = 0x0001;
193+
194+ __set_bit(EV_KEY, input->evbit);
195+
196+ for (i = 0; i < ARRAY_SIZE(n526_lpc_keymap); ++i) {
197+ if (n526_lpc_keymap[i] != 0)
198+ __set_bit(n526_lpc_keymap[i], input->keybit);
199+ }
200+
201+ ret = input_register_device(input);
202+
203+ if (ret) {
204+ dev_err(&client->dev, "Failed to register input device: %d\n", ret);
205+ goto err_free_input;
206+ }
207+
208+ n526_lpc->client = client;
209+ n526_lpc->input = input;
210+ INIT_WORK(&n526_lpc->work, n526_lpc_irq_work);
211+
212+ ret = request_irq(client->irq, n526_lpc_irq, IRQF_TRIGGER_FALLING,
213+ "n526-lpc", n526_lpc);
214+ if (ret) {
215+ dev_err(&client->dev, "Failed to request irq: %d\n", ret);
216+ goto err_unregister_input;
217+ }
218+
219+ i2c_set_clientdata(client, n526_lpc);
220+
221+ return 0;
222+
223+err_unregister_input:
224+ input_unregister_device(input);
225+err_free_input:
226+ input_free_device(input);
227+err_free:
228+ kfree(n526_lpc);
229+
230+ return ret;
231+}
232+
233+static int n526_lpc_remove(struct i2c_client *client)
234+{
235+ struct n526_lpc *n526_lpc = i2c_get_clientdata(client);
236+
237+ free_irq(client->irq, n526_lpc);
238+
239+ i2c_set_clientdata(client, NULL);
240+ input_unregister_device(n526_lpc->input);
241+ input_free_device(n526_lpc->input);
242+ kfree(n526_lpc);
243+
244+ return 0;
245+}
246+
247+static const struct i2c_device_id n526_lpc_id[] = {
248+ { "n526-lpc", 0 },
249+ { }
250+};
251+MODULE_DEVICE_TABLE(i2c, n526_lpc_id);
252+
253+static struct i2c_driver n526_lpc_driver = {
254+ .driver = {
255+ .name = "n526-lpc",
256+ .owner = THIS_MODULE,
257+ },
258+ .probe = n526_lpc_probe,
259+ .remove = n526_lpc_remove,
260+ .id_table = n526_lpc_id,
261+};
262+
263+static int __init n526_lpc_init(void)
264+{
265+ return i2c_add_driver(&n526_lpc_driver);
266+}
267+module_init(n526_lpc_init);
268+
269+static void __exit n526_lpc_exit(void)
270+{
271+ i2c_del_driver(&n526_lpc_driver);
272+}
273+module_exit(n526_lpc_exit);
274+
275+MODULE_LICENSE("GPL");
276+MODULE_AUTHOR("Lars-Peter Clausen");
277+MODULE_DESCRIPTION("n526 keypad driver");
278+MODULE_ALIAS("i2c:n526-keys");
279

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