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885c316d MD |
1 | /* |
2 | * Touch Screen driver for Renesas MIGO-R Platform | |
3 | * | |
4 | * Copyright (c) 2008 Magnus Damm | |
5 | * Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>, | |
6 | * Kenati Technologies Pvt Ltd. | |
7 | * | |
8 | * This file is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | * This file is distributed in the hope that it will be useful, | |
14 | * but 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 | * You should have received a copy of the GNU General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | #include <linux/module.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/input.h> | |
25 | #include <linux/interrupt.h> | |
d72e64ec | 26 | #include <linux/pm.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
885c316d MD |
28 | #include <asm/io.h> |
29 | #include <linux/i2c.h> | |
30 | #include <linux/timer.h> | |
31 | ||
32 | #define EVENT_PENDOWN 1 | |
33 | #define EVENT_REPEAT 2 | |
34 | #define EVENT_PENUP 3 | |
35 | ||
36 | struct migor_ts_priv { | |
37 | struct i2c_client *client; | |
38 | struct input_dev *input; | |
885c316d MD |
39 | int irq; |
40 | }; | |
41 | ||
42 | static const u_int8_t migor_ts_ena_seq[17] = { 0x33, 0x22, 0x11, | |
43 | 0x01, 0x06, 0x07, }; | |
44 | static const u_int8_t migor_ts_dis_seq[17] = { }; | |
45 | ||
468792eb | 46 | static irqreturn_t migor_ts_isr(int irq, void *dev_id) |
885c316d | 47 | { |
468792eb | 48 | struct migor_ts_priv *priv = dev_id; |
885c316d MD |
49 | unsigned short xpos, ypos; |
50 | unsigned char event; | |
51 | u_int8_t buf[16]; | |
52 | ||
468792eb DT |
53 | /* |
54 | * The touch screen controller chip is hooked up to the CPU | |
55 | * using I2C and a single interrupt line. The interrupt line | |
56 | * is pulled low whenever someone taps the screen. To deassert | |
57 | * the interrupt line we need to acknowledge the interrupt by | |
58 | * communicating with the controller over the slow i2c bus. | |
59 | * | |
60 | * Since I2C bus controller may sleep we are using threaded | |
61 | * IRQ here. | |
62 | */ | |
63 | ||
885c316d MD |
64 | memset(buf, 0, sizeof(buf)); |
65 | ||
66 | /* Set Index 0 */ | |
67 | buf[0] = 0; | |
68 | if (i2c_master_send(priv->client, buf, 1) != 1) { | |
69 | dev_err(&priv->client->dev, "Unable to write i2c index\n"); | |
70 | goto out; | |
71 | } | |
72 | ||
73 | /* Now do Page Read */ | |
74 | if (i2c_master_recv(priv->client, buf, sizeof(buf)) != sizeof(buf)) { | |
75 | dev_err(&priv->client->dev, "Unable to read i2c page\n"); | |
76 | goto out; | |
77 | } | |
78 | ||
79 | ypos = ((buf[9] & 0x03) << 8 | buf[8]); | |
80 | xpos = ((buf[11] & 0x03) << 8 | buf[10]); | |
81 | event = buf[12]; | |
82 | ||
468792eb DT |
83 | switch (event) { |
84 | case EVENT_PENDOWN: | |
85 | case EVENT_REPEAT: | |
885c316d MD |
86 | input_report_key(priv->input, BTN_TOUCH, 1); |
87 | input_report_abs(priv->input, ABS_X, ypos); /*X-Y swap*/ | |
88 | input_report_abs(priv->input, ABS_Y, xpos); | |
89 | input_sync(priv->input); | |
468792eb DT |
90 | break; |
91 | ||
92 | case EVENT_PENUP: | |
885c316d MD |
93 | input_report_key(priv->input, BTN_TOUCH, 0); |
94 | input_sync(priv->input); | |
468792eb | 95 | break; |
885c316d | 96 | } |
885c316d | 97 | |
468792eb | 98 | out: |
885c316d MD |
99 | return IRQ_HANDLED; |
100 | } | |
101 | ||
885c316d MD |
102 | static int migor_ts_open(struct input_dev *dev) |
103 | { | |
104 | struct migor_ts_priv *priv = input_get_drvdata(dev); | |
105 | struct i2c_client *client = priv->client; | |
106 | int count; | |
107 | ||
108 | /* enable controller */ | |
109 | count = i2c_master_send(client, migor_ts_ena_seq, | |
110 | sizeof(migor_ts_ena_seq)); | |
111 | if (count != sizeof(migor_ts_ena_seq)) { | |
112 | dev_err(&client->dev, "Unable to enable touchscreen.\n"); | |
113 | return -ENXIO; | |
114 | } | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | static void migor_ts_close(struct input_dev *dev) | |
120 | { | |
121 | struct migor_ts_priv *priv = input_get_drvdata(dev); | |
122 | struct i2c_client *client = priv->client; | |
123 | ||
124 | disable_irq(priv->irq); | |
125 | ||
885c316d MD |
126 | /* disable controller */ |
127 | i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq)); | |
128 | ||
129 | enable_irq(priv->irq); | |
130 | } | |
131 | ||
132 | static int migor_ts_probe(struct i2c_client *client, | |
133 | const struct i2c_device_id *idp) | |
134 | { | |
135 | struct migor_ts_priv *priv; | |
136 | struct input_dev *input; | |
137 | int error; | |
138 | ||
139 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
885c316d | 140 | input = input_allocate_device(); |
ff4d0492 DT |
141 | if (!priv || !input) { |
142 | dev_err(&client->dev, "failed to allocate memory\n"); | |
885c316d | 143 | error = -ENOMEM; |
ff4d0492 | 144 | goto err_free_mem; |
885c316d MD |
145 | } |
146 | ||
ff4d0492 DT |
147 | priv->client = client; |
148 | priv->input = input; | |
149 | priv->irq = client->irq; | |
150 | ||
885c316d | 151 | input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
ff4d0492 DT |
152 | |
153 | __set_bit(BTN_TOUCH, input->keybit); | |
885c316d MD |
154 | |
155 | input_set_abs_params(input, ABS_X, 95, 955, 0, 0); | |
156 | input_set_abs_params(input, ABS_Y, 85, 935, 0, 0); | |
157 | ||
b6ce9ad0 | 158 | input->name = client->name; |
885c316d MD |
159 | input->id.bustype = BUS_I2C; |
160 | input->dev.parent = &client->dev; | |
161 | ||
162 | input->open = migor_ts_open; | |
163 | input->close = migor_ts_close; | |
164 | ||
165 | input_set_drvdata(input, priv); | |
166 | ||
468792eb DT |
167 | error = request_threaded_irq(priv->irq, NULL, migor_ts_isr, |
168 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
169 | client->name, priv); | |
885c316d MD |
170 | if (error) { |
171 | dev_err(&client->dev, "Unable to request touchscreen IRQ.\n"); | |
ff4d0492 | 172 | goto err_free_mem; |
885c316d MD |
173 | } |
174 | ||
ff4d0492 DT |
175 | error = input_register_device(input); |
176 | if (error) | |
177 | goto err_free_irq; | |
178 | ||
ec208612 | 179 | i2c_set_clientdata(client, priv); |
0935ade0 | 180 | device_init_wakeup(&client->dev, 1); |
ff4d0492 | 181 | |
885c316d MD |
182 | return 0; |
183 | ||
ff4d0492 DT |
184 | err_free_irq: |
185 | free_irq(priv->irq, priv); | |
186 | err_free_mem: | |
885c316d MD |
187 | input_free_device(input); |
188 | kfree(priv); | |
885c316d MD |
189 | return error; |
190 | } | |
191 | ||
192 | static int migor_ts_remove(struct i2c_client *client) | |
193 | { | |
ec208612 | 194 | struct migor_ts_priv *priv = i2c_get_clientdata(client); |
885c316d MD |
195 | |
196 | free_irq(priv->irq, priv); | |
197 | input_unregister_device(priv->input); | |
198 | kfree(priv); | |
199 | ||
200 | dev_set_drvdata(&client->dev, NULL); | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
c32feb03 | 205 | static int __maybe_unused migor_ts_suspend(struct device *dev) |
0935ade0 | 206 | { |
d72e64ec | 207 | struct i2c_client *client = to_i2c_client(dev); |
ec208612 | 208 | struct migor_ts_priv *priv = i2c_get_clientdata(client); |
0935ade0 MD |
209 | |
210 | if (device_may_wakeup(&client->dev)) | |
211 | enable_irq_wake(priv->irq); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
c32feb03 | 216 | static int __maybe_unused migor_ts_resume(struct device *dev) |
0935ade0 | 217 | { |
d72e64ec | 218 | struct i2c_client *client = to_i2c_client(dev); |
ec208612 | 219 | struct migor_ts_priv *priv = i2c_get_clientdata(client); |
0935ade0 MD |
220 | |
221 | if (device_may_wakeup(&client->dev)) | |
222 | disable_irq_wake(priv->irq); | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
d72e64ec MB |
227 | static SIMPLE_DEV_PM_OPS(migor_ts_pm, migor_ts_suspend, migor_ts_resume); |
228 | ||
b6ce9ad0 MD |
229 | static const struct i2c_device_id migor_ts_id[] = { |
230 | { "migor_ts", 0 }, | |
231 | { } | |
232 | }; | |
8f4decc3 | 233 | MODULE_DEVICE_TABLE(i2c, migor_ts_id); |
b6ce9ad0 | 234 | |
885c316d MD |
235 | static struct i2c_driver migor_ts_driver = { |
236 | .driver = { | |
237 | .name = "migor_ts", | |
d72e64ec | 238 | .pm = &migor_ts_pm, |
885c316d MD |
239 | }, |
240 | .probe = migor_ts_probe, | |
241 | .remove = migor_ts_remove, | |
b6ce9ad0 | 242 | .id_table = migor_ts_id, |
885c316d MD |
243 | }; |
244 | ||
1b92c1cf | 245 | module_i2c_driver(migor_ts_driver); |
885c316d MD |
246 | |
247 | MODULE_DESCRIPTION("MigoR Touchscreen driver"); | |
248 | MODULE_AUTHOR("Magnus Damm <damm@opensource.se>"); | |
249 | MODULE_LICENSE("GPL"); |