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42033065 ZJ |
1 | /* |
2 | * Driver for MAXI MAX11801 - A Resistive touch screen controller with | |
3 | * i2c interface | |
4 | * | |
5 | * Copyright (C) 2011 Freescale Semiconductor, Inc. | |
6 | * Author: Zhang Jiejing <jiejing.zhang@freescale.com> | |
7 | * | |
8 | * Based on mcs5000_ts.c | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
d70d43d7 JZ |
12 | * the Free Software Foundation; either version 2 of the License, or |
13 | * (at your option) any later version. | |
42033065 ZJ |
14 | */ |
15 | ||
16 | /* | |
17 | * This driver aims to support the series of MAXI touch chips max11801 | |
18 | * through max11803. The main difference between these 4 chips can be | |
19 | * found in the table below: | |
20 | * ----------------------------------------------------- | |
21 | * | CHIP | AUTO MODE SUPPORT(FIFO) | INTERFACE | | |
22 | * |----------------------------------------------------| | |
23 | * | max11800 | YES | SPI | | |
24 | * | max11801 | YES | I2C | | |
25 | * | max11802 | NO | SPI | | |
26 | * | max11803 | NO | I2C | | |
27 | * ------------------------------------------------------ | |
28 | * | |
29 | * Currently, this driver only supports max11801. | |
30 | * | |
31 | * Data Sheet: | |
32 | * http://www.maxim-ic.com/datasheet/index.mvp/id/5943 | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/i2c.h> | |
38 | #include <linux/interrupt.h> | |
39 | #include <linux/input.h> | |
40 | #include <linux/slab.h> | |
41 | #include <linux/bitops.h> | |
42 | ||
43 | /* Register Address define */ | |
44 | #define GENERNAL_STATUS_REG 0x00 | |
45 | #define GENERNAL_CONF_REG 0x01 | |
46 | #define MESURE_RES_CONF_REG 0x02 | |
47 | #define MESURE_AVER_CONF_REG 0x03 | |
48 | #define ADC_SAMPLE_TIME_CONF_REG 0x04 | |
49 | #define PANEL_SETUPTIME_CONF_REG 0x05 | |
50 | #define DELAY_CONVERSION_CONF_REG 0x06 | |
51 | #define TOUCH_DETECT_PULLUP_CONF_REG 0x07 | |
52 | #define AUTO_MODE_TIME_CONF_REG 0x08 /* only for max11800/max11801 */ | |
53 | #define APERTURE_CONF_REG 0x09 /* only for max11800/max11801 */ | |
54 | #define AUX_MESURE_CONF_REG 0x0a | |
55 | #define OP_MODE_CONF_REG 0x0b | |
56 | ||
57 | /* FIFO is found only in max11800 and max11801 */ | |
58 | #define FIFO_RD_CMD (0x50 << 1) | |
59 | #define MAX11801_FIFO_INT (1 << 2) | |
60 | #define MAX11801_FIFO_OVERFLOW (1 << 3) | |
61 | ||
62 | #define XY_BUFSIZE 4 | |
63 | #define XY_BUF_OFFSET 4 | |
64 | ||
65 | #define MAX11801_MAX_X 0xfff | |
66 | #define MAX11801_MAX_Y 0xfff | |
67 | ||
68 | #define MEASURE_TAG_OFFSET 2 | |
69 | #define MEASURE_TAG_MASK (3 << MEASURE_TAG_OFFSET) | |
70 | #define EVENT_TAG_OFFSET 0 | |
71 | #define EVENT_TAG_MASK (3 << EVENT_TAG_OFFSET) | |
72 | #define MEASURE_X_TAG (0 << MEASURE_TAG_OFFSET) | |
73 | #define MEASURE_Y_TAG (1 << MEASURE_TAG_OFFSET) | |
74 | ||
75 | /* These are the state of touch event state machine */ | |
76 | enum { | |
77 | EVENT_INIT, | |
78 | EVENT_MIDDLE, | |
79 | EVENT_RELEASE, | |
80 | EVENT_FIFO_END | |
81 | }; | |
82 | ||
83 | struct max11801_data { | |
84 | struct i2c_client *client; | |
85 | struct input_dev *input_dev; | |
86 | }; | |
87 | ||
88 | static u8 read_register(struct i2c_client *client, int addr) | |
89 | { | |
90 | /* XXX: The chip ignores LSB of register address */ | |
91 | return i2c_smbus_read_byte_data(client, addr << 1); | |
92 | } | |
93 | ||
94 | static int max11801_write_reg(struct i2c_client *client, int addr, int data) | |
95 | { | |
96 | /* XXX: The chip ignores LSB of register address */ | |
97 | return i2c_smbus_write_byte_data(client, addr << 1, data); | |
98 | } | |
99 | ||
100 | static irqreturn_t max11801_ts_interrupt(int irq, void *dev_id) | |
101 | { | |
102 | struct max11801_data *data = dev_id; | |
103 | struct i2c_client *client = data->client; | |
104 | int status, i, ret; | |
105 | u8 buf[XY_BUFSIZE]; | |
106 | int x = -1; | |
107 | int y = -1; | |
108 | ||
109 | status = read_register(data->client, GENERNAL_STATUS_REG); | |
110 | ||
111 | if (status & (MAX11801_FIFO_INT | MAX11801_FIFO_OVERFLOW)) { | |
112 | status = read_register(data->client, GENERNAL_STATUS_REG); | |
113 | ||
114 | ret = i2c_smbus_read_i2c_block_data(client, FIFO_RD_CMD, | |
115 | XY_BUFSIZE, buf); | |
116 | ||
117 | /* | |
118 | * We should get 4 bytes buffer that contains X,Y | |
119 | * and event tag | |
120 | */ | |
121 | if (ret < XY_BUFSIZE) | |
122 | goto out; | |
123 | ||
124 | for (i = 0; i < XY_BUFSIZE; i += XY_BUFSIZE / 2) { | |
125 | if ((buf[i + 1] & MEASURE_TAG_MASK) == MEASURE_X_TAG) | |
126 | x = (buf[i] << XY_BUF_OFFSET) + | |
127 | (buf[i + 1] >> XY_BUF_OFFSET); | |
128 | else if ((buf[i + 1] & MEASURE_TAG_MASK) == MEASURE_Y_TAG) | |
129 | y = (buf[i] << XY_BUF_OFFSET) + | |
130 | (buf[i + 1] >> XY_BUF_OFFSET); | |
131 | } | |
132 | ||
133 | if ((buf[1] & EVENT_TAG_MASK) != (buf[3] & EVENT_TAG_MASK)) | |
134 | goto out; | |
135 | ||
136 | switch (buf[1] & EVENT_TAG_MASK) { | |
137 | case EVENT_INIT: | |
138 | /* fall through */ | |
139 | case EVENT_MIDDLE: | |
140 | input_report_abs(data->input_dev, ABS_X, x); | |
141 | input_report_abs(data->input_dev, ABS_Y, y); | |
142 | input_event(data->input_dev, EV_KEY, BTN_TOUCH, 1); | |
143 | input_sync(data->input_dev); | |
144 | break; | |
145 | ||
146 | case EVENT_RELEASE: | |
147 | input_event(data->input_dev, EV_KEY, BTN_TOUCH, 0); | |
148 | input_sync(data->input_dev); | |
149 | break; | |
150 | ||
151 | case EVENT_FIFO_END: | |
152 | break; | |
153 | } | |
154 | } | |
155 | out: | |
156 | return IRQ_HANDLED; | |
157 | } | |
158 | ||
159 | static void __devinit max11801_ts_phy_init(struct max11801_data *data) | |
160 | { | |
161 | struct i2c_client *client = data->client; | |
162 | ||
163 | /* Average X,Y, take 16 samples, average eight media sample */ | |
164 | max11801_write_reg(client, MESURE_AVER_CONF_REG, 0xff); | |
165 | /* X,Y panel setup time set to 20us */ | |
166 | max11801_write_reg(client, PANEL_SETUPTIME_CONF_REG, 0x11); | |
167 | /* Rough pullup time (2uS), Fine pullup time (10us) */ | |
168 | max11801_write_reg(client, TOUCH_DETECT_PULLUP_CONF_REG, 0x10); | |
169 | /* Auto mode init period = 5ms , scan period = 5ms*/ | |
170 | max11801_write_reg(client, AUTO_MODE_TIME_CONF_REG, 0xaa); | |
171 | /* Aperture X,Y set to +- 4LSB */ | |
172 | max11801_write_reg(client, APERTURE_CONF_REG, 0x33); | |
173 | /* Enable Power, enable Automode, enable Aperture, enable Average X,Y */ | |
174 | max11801_write_reg(client, OP_MODE_CONF_REG, 0x36); | |
175 | } | |
176 | ||
177 | static int __devinit max11801_ts_probe(struct i2c_client *client, | |
178 | const struct i2c_device_id *id) | |
179 | { | |
180 | struct max11801_data *data; | |
181 | struct input_dev *input_dev; | |
182 | int error; | |
183 | ||
184 | data = kzalloc(sizeof(struct max11801_data), GFP_KERNEL); | |
185 | input_dev = input_allocate_device(); | |
186 | if (!data || !input_dev) { | |
187 | dev_err(&client->dev, "Failed to allocate memory\n"); | |
188 | error = -ENOMEM; | |
189 | goto err_free_mem; | |
190 | } | |
191 | ||
192 | data->client = client; | |
193 | data->input_dev = input_dev; | |
194 | ||
195 | input_dev->name = "max11801_ts"; | |
196 | input_dev->id.bustype = BUS_I2C; | |
197 | input_dev->dev.parent = &client->dev; | |
198 | ||
199 | __set_bit(EV_ABS, input_dev->evbit); | |
200 | __set_bit(EV_KEY, input_dev->evbit); | |
201 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
202 | input_set_abs_params(input_dev, ABS_X, 0, MAX11801_MAX_X, 0, 0); | |
203 | input_set_abs_params(input_dev, ABS_Y, 0, MAX11801_MAX_Y, 0, 0); | |
204 | input_set_drvdata(input_dev, data); | |
205 | ||
206 | max11801_ts_phy_init(data); | |
207 | ||
208 | error = request_threaded_irq(client->irq, NULL, max11801_ts_interrupt, | |
209 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
210 | "max11801_ts", data); | |
211 | if (error) { | |
212 | dev_err(&client->dev, "Failed to register interrupt\n"); | |
213 | goto err_free_mem; | |
214 | } | |
215 | ||
216 | error = input_register_device(data->input_dev); | |
217 | if (error) | |
218 | goto err_free_irq; | |
219 | ||
220 | i2c_set_clientdata(client, data); | |
221 | return 0; | |
222 | ||
223 | err_free_irq: | |
224 | free_irq(client->irq, data); | |
225 | err_free_mem: | |
226 | input_free_device(input_dev); | |
227 | kfree(data); | |
228 | return error; | |
229 | } | |
230 | ||
231 | static __devexit int max11801_ts_remove(struct i2c_client *client) | |
232 | { | |
233 | struct max11801_data *data = i2c_get_clientdata(client); | |
234 | ||
235 | free_irq(client->irq, data); | |
236 | input_unregister_device(data->input_dev); | |
237 | kfree(data); | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static const struct i2c_device_id max11801_ts_id[] = { | |
243 | {"max11801", 0}, | |
244 | { } | |
245 | }; | |
246 | MODULE_DEVICE_TABLE(i2c, max11801_ts_id); | |
247 | ||
248 | static struct i2c_driver max11801_ts_driver = { | |
249 | .driver = { | |
250 | .name = "max11801_ts", | |
251 | .owner = THIS_MODULE, | |
252 | }, | |
253 | .id_table = max11801_ts_id, | |
254 | .probe = max11801_ts_probe, | |
1cb0aa88 | 255 | .remove = max11801_ts_remove, |
42033065 ZJ |
256 | }; |
257 | ||
1b92c1cf | 258 | module_i2c_driver(max11801_ts_driver); |
42033065 ZJ |
259 | |
260 | MODULE_AUTHOR("Zhang Jiejing <jiejing.zhang@freescale.com>"); | |
261 | MODULE_DESCRIPTION("Touchscreen driver for MAXI MAX11801 controller"); | |
262 | MODULE_LICENSE("GPL"); |