diff options
author | Wolfram Sang <w.sang@pengutronix.de> | 2012-04-03 16:39:44 -0400 |
---|---|---|
committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-04-04 12:25:39 -0400 |
commit | 0bf25a45386f284d591530ef174eaa9e44d84956 (patch) | |
tree | 128d3124b99531345cfbfcf4045ec03c7996eab1 /drivers/input | |
parent | 5a966261c0dfb836f54444ff3893638802183cac (diff) |
Input: add support for LM8333 keypads
This driver adds support for the keypad part of the LM8333 and is
prepared for possible GPIO/PWM drivers. Note that this is not a MFD
because you cannot disable the keypad functionality which, thus,
has to be handled by the core anyhow.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input')
-rw-r--r-- | drivers/input/keyboard/Kconfig | 10 | ||||
-rw-r--r-- | drivers/input/keyboard/Makefile | 1 | ||||
-rw-r--r-- | drivers/input/keyboard/lm8333.c | 236 |
3 files changed, 247 insertions, 0 deletions
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index f354813a13e..7eaf93fe512 100644 --- a/drivers/input/keyboard/Kconfig +++ b/drivers/input/keyboard/Kconfig | |||
@@ -309,6 +309,16 @@ config KEYBOARD_LM8323 | |||
309 | To compile this driver as a module, choose M here: the | 309 | To compile this driver as a module, choose M here: the |
310 | module will be called lm8323. | 310 | module will be called lm8323. |
311 | 311 | ||
312 | config KEYBOARD_LM8333 | ||
313 | tristate "LM8333 keypad chip" | ||
314 | depends on I2C | ||
315 | help | ||
316 | If you say yes here you get support for the National Semiconductor | ||
317 | LM8333 keypad controller. | ||
318 | |||
319 | To compile this driver as a module, choose M here: the | ||
320 | module will be called lm8333. | ||
321 | |||
312 | config KEYBOARD_LOCOMO | 322 | config KEYBOARD_LOCOMO |
313 | tristate "LoCoMo Keyboard Support" | 323 | tristate "LoCoMo Keyboard Support" |
314 | depends on SHARP_LOCOMO | 324 | depends on SHARP_LOCOMO |
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile index df7061f1291..b03b02456a8 100644 --- a/drivers/input/keyboard/Makefile +++ b/drivers/input/keyboard/Makefile | |||
@@ -24,6 +24,7 @@ obj-$(CONFIG_KEYBOARD_HP6XX) += jornada680_kbd.o | |||
24 | obj-$(CONFIG_KEYBOARD_HP7XX) += jornada720_kbd.o | 24 | obj-$(CONFIG_KEYBOARD_HP7XX) += jornada720_kbd.o |
25 | obj-$(CONFIG_KEYBOARD_LKKBD) += lkkbd.o | 25 | obj-$(CONFIG_KEYBOARD_LKKBD) += lkkbd.o |
26 | obj-$(CONFIG_KEYBOARD_LM8323) += lm8323.o | 26 | obj-$(CONFIG_KEYBOARD_LM8323) += lm8323.o |
27 | obj-$(CONFIG_KEYBOARD_LM8333) += lm8333.o | ||
27 | obj-$(CONFIG_KEYBOARD_LOCOMO) += locomokbd.o | 28 | obj-$(CONFIG_KEYBOARD_LOCOMO) += locomokbd.o |
28 | obj-$(CONFIG_KEYBOARD_MAPLE) += maple_keyb.o | 29 | obj-$(CONFIG_KEYBOARD_MAPLE) += maple_keyb.o |
29 | obj-$(CONFIG_KEYBOARD_MATRIX) += matrix_keypad.o | 30 | obj-$(CONFIG_KEYBOARD_MATRIX) += matrix_keypad.o |
diff --git a/drivers/input/keyboard/lm8333.c b/drivers/input/keyboard/lm8333.c new file mode 100644 index 00000000000..9a8c4a6cf5c --- /dev/null +++ b/drivers/input/keyboard/lm8333.c | |||
@@ -0,0 +1,236 @@ | |||
1 | /* | ||
2 | * LM8333 keypad driver | ||
3 | * Copyright (C) 2012 Wolfram Sang, Pengutronix <w.sang@pengutronix.de> | ||
4 | * | ||
5 | * This program is free software; you can redistribute it and/or modify | ||
6 | * it under the terms of the GNU General Public License as published by | ||
7 | * the Free Software Foundation; either version 2 of the License. | ||
8 | */ | ||
9 | |||
10 | #include <linux/module.h> | ||
11 | #include <linux/slab.h> | ||
12 | #include <linux/irq.h> | ||
13 | #include <linux/i2c.h> | ||
14 | #include <linux/interrupt.h> | ||
15 | #include <linux/input/matrix_keypad.h> | ||
16 | #include <linux/input/lm8333.h> | ||
17 | |||
18 | #define LM8333_FIFO_READ 0x20 | ||
19 | #define LM8333_DEBOUNCE 0x22 | ||
20 | #define LM8333_READ_INT 0xD0 | ||
21 | #define LM8333_ACTIVE 0xE4 | ||
22 | #define LM8333_READ_ERROR 0xF0 | ||
23 | |||
24 | #define LM8333_KEYPAD_IRQ (1 << 0) | ||
25 | #define LM8333_ERROR_IRQ (1 << 3) | ||
26 | |||
27 | #define LM8333_ERROR_KEYOVR 0x04 | ||
28 | #define LM8333_ERROR_FIFOOVR 0x40 | ||
29 | |||
30 | #define LM8333_FIFO_TRANSFER_SIZE 16 | ||
31 | |||
32 | #define LM8333_ROW_SHIFT 4 | ||
33 | #define LM8333_NUM_ROWS 8 | ||
34 | |||
35 | |||
36 | struct lm8333 { | ||
37 | struct i2c_client *client; | ||
38 | struct input_dev *input; | ||
39 | unsigned short keycodes[LM8333_NUM_ROWS << LM8333_ROW_SHIFT]; | ||
40 | }; | ||
41 | |||
42 | /* The accessors try twice because the first access may be needed for wakeup */ | ||
43 | #define LM8333_READ_RETRIES 2 | ||
44 | |||
45 | int lm8333_read8(struct lm8333 *lm8333, u8 cmd) | ||
46 | { | ||
47 | int retries = 0, ret; | ||
48 | |||
49 | do { | ||
50 | ret = i2c_smbus_read_byte_data(lm8333->client, cmd); | ||
51 | } while (ret < 0 && retries++ < LM8333_READ_RETRIES); | ||
52 | |||
53 | return ret; | ||
54 | } | ||
55 | |||
56 | int lm8333_write8(struct lm8333 *lm8333, u8 cmd, u8 val) | ||
57 | { | ||
58 | int retries = 0, ret; | ||
59 | |||
60 | do { | ||
61 | ret = i2c_smbus_write_byte_data(lm8333->client, cmd, val); | ||
62 | } while (ret < 0 && retries++ < LM8333_READ_RETRIES); | ||
63 | |||
64 | return ret; | ||
65 | } | ||
66 | |||
67 | int lm8333_read_block(struct lm8333 *lm8333, u8 cmd, u8 len, u8 *buf) | ||
68 | { | ||
69 | int retries = 0, ret; | ||
70 | |||
71 | do { | ||
72 | ret = i2c_smbus_read_i2c_block_data(lm8333->client, | ||
73 | cmd, len, buf); | ||
74 | } while (ret < 0 && retries++ < LM8333_READ_RETRIES); | ||
75 | |||
76 | return ret; | ||
77 | } | ||
78 | |||
79 | static void lm8333_key_handler(struct lm8333 *lm8333) | ||
80 | { | ||
81 | struct input_dev *input = lm8333->input; | ||
82 | u8 keys[LM8333_FIFO_TRANSFER_SIZE]; | ||
83 | u8 code, pressed; | ||
84 | int i, ret; | ||
85 | |||
86 | ret = lm8333_read_block(lm8333, LM8333_FIFO_READ, | ||
87 | LM8333_FIFO_TRANSFER_SIZE, keys); | ||
88 | if (ret != LM8333_FIFO_TRANSFER_SIZE) { | ||
89 | dev_err(&lm8333->client->dev, | ||
90 | "Error %d while reading FIFO\n", ret); | ||
91 | return; | ||
92 | } | ||
93 | |||
94 | for (i = 0; keys[i] && i < LM8333_FIFO_TRANSFER_SIZE; i++) { | ||
95 | pressed = keys[i] & 0x80; | ||
96 | code = keys[i] & 0x7f; | ||
97 | |||
98 | input_event(input, EV_MSC, MSC_SCAN, code); | ||
99 | input_report_key(input, lm8333->keycodes[code], pressed); | ||
100 | } | ||
101 | |||
102 | input_sync(input); | ||
103 | } | ||
104 | |||
105 | static irqreturn_t lm8333_irq_thread(int irq, void *data) | ||
106 | { | ||
107 | struct lm8333 *lm8333 = data; | ||
108 | u8 status = lm8333_read8(lm8333, LM8333_READ_INT); | ||
109 | |||
110 | if (!status) | ||
111 | return IRQ_NONE; | ||
112 | |||
113 | if (status & LM8333_ERROR_IRQ) { | ||
114 | u8 err = lm8333_read8(lm8333, LM8333_READ_ERROR); | ||
115 | |||
116 | if (err & (LM8333_ERROR_KEYOVR | LM8333_ERROR_FIFOOVR)) { | ||
117 | u8 dummy[LM8333_FIFO_TRANSFER_SIZE]; | ||
118 | |||
119 | lm8333_read_block(lm8333, LM8333_FIFO_READ, | ||
120 | LM8333_FIFO_TRANSFER_SIZE, dummy); | ||
121 | } | ||
122 | dev_err(&lm8333->client->dev, "Got error %02x\n", err); | ||
123 | } | ||
124 | |||
125 | if (status & LM8333_KEYPAD_IRQ) | ||
126 | lm8333_key_handler(lm8333); | ||
127 | |||
128 | return IRQ_HANDLED; | ||
129 | } | ||
130 | |||
131 | static int __devinit lm8333_probe(struct i2c_client *client, | ||
132 | const struct i2c_device_id *id) | ||
133 | { | ||
134 | const struct lm8333_platform_data *pdata = client->dev.platform_data; | ||
135 | struct lm8333 *lm8333; | ||
136 | struct input_dev *input; | ||
137 | int err, active_time; | ||
138 | |||
139 | if (!pdata) | ||
140 | return -EINVAL; | ||
141 | |||
142 | active_time = pdata->active_time ?: 500; | ||
143 | if (active_time / 3 <= pdata->debounce_time / 3) { | ||
144 | dev_err(&client->dev, "Active time not big enough!\n"); | ||
145 | return -EINVAL; | ||
146 | } | ||
147 | |||
148 | lm8333 = kzalloc(sizeof(*lm8333), GFP_KERNEL); | ||
149 | input = input_allocate_device(); | ||
150 | if (!lm8333 || !input) { | ||
151 | err = -ENOMEM; | ||
152 | goto free_mem; | ||
153 | } | ||
154 | |||
155 | lm8333->client = client; | ||
156 | lm8333->input = input; | ||
157 | |||
158 | input->name = client->name; | ||
159 | input->dev.parent = &client->dev; | ||
160 | input->id.bustype = BUS_I2C; | ||
161 | |||
162 | input->keycode = lm8333->keycodes; | ||
163 | input->keycodesize = sizeof(lm8333->keycodes[0]); | ||
164 | input->keycodemax = ARRAY_SIZE(lm8333->keycodes); | ||
165 | input->evbit[0] = BIT_MASK(EV_KEY); | ||
166 | input_set_capability(input, EV_MSC, MSC_SCAN); | ||
167 | |||
168 | matrix_keypad_build_keymap(pdata->matrix_data, LM8333_ROW_SHIFT, | ||
169 | input->keycode, input->keybit); | ||
170 | |||
171 | if (pdata->debounce_time) { | ||
172 | err = lm8333_write8(lm8333, LM8333_DEBOUNCE, | ||
173 | pdata->debounce_time / 3); | ||
174 | if (err) | ||
175 | dev_warn(&client->dev, "Unable to set debounce time\n"); | ||
176 | } | ||
177 | |||
178 | if (pdata->active_time) { | ||
179 | err = lm8333_write8(lm8333, LM8333_ACTIVE, | ||
180 | pdata->active_time / 3); | ||
181 | if (err) | ||
182 | dev_warn(&client->dev, "Unable to set active time\n"); | ||
183 | } | ||
184 | |||
185 | err = request_threaded_irq(client->irq, NULL, lm8333_irq_thread, | ||
186 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | ||
187 | "lm8333", lm8333); | ||
188 | if (err) | ||
189 | goto free_mem; | ||
190 | |||
191 | err = input_register_device(input); | ||
192 | if (err) | ||
193 | goto free_irq; | ||
194 | |||
195 | i2c_set_clientdata(client, lm8333); | ||
196 | return 0; | ||
197 | |||
198 | free_irq: | ||
199 | free_irq(client->irq, lm8333); | ||
200 | free_mem: | ||
201 | input_free_device(input); | ||
202 | kfree(lm8333); | ||
203 | return err; | ||
204 | } | ||
205 | |||
206 | static int __devexit lm8333_remove(struct i2c_client *client) | ||
207 | { | ||
208 | struct lm8333 *lm8333 = i2c_get_clientdata(client); | ||
209 | |||
210 | free_irq(client->irq, lm8333); | ||
211 | input_unregister_device(lm8333->input); | ||
212 | kfree(lm8333); | ||
213 | |||
214 | return 0; | ||
215 | } | ||
216 | |||
217 | static const struct i2c_device_id lm8333_id[] = { | ||
218 | { "lm8333", 0 }, | ||
219 | { } | ||
220 | }; | ||
221 | MODULE_DEVICE_TABLE(i2c, lm8333_id); | ||
222 | |||
223 | static struct i2c_driver lm8333_driver = { | ||
224 | .driver = { | ||
225 | .name = "lm8333", | ||
226 | .owner = THIS_MODULE, | ||
227 | }, | ||
228 | .probe = lm8333_probe, | ||
229 | .remove = __devexit_p(lm8333_remove), | ||
230 | .id_table = lm8333_id, | ||
231 | }; | ||
232 | module_i2c_driver(lm8333_driver); | ||
233 | |||
234 | MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>"); | ||
235 | MODULE_DESCRIPTION("LM8333 keyboard driver"); | ||
236 | MODULE_LICENSE("GPL v2"); | ||