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11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/i2c.h>
15#include <linux/input.h>
16#include <linux/mfd/88pm860x.h>
17#include <linux/slab.h>
18
19#define MEAS_LEN (8)
20#define ACCURATE_BIT (12)
21
22
23#define MEAS_EN3 (0x52)
24
25#define MEAS_TSIX_1 (0x8D)
26#define MEAS_TSIX_2 (0x8E)
27#define MEAS_TSIY_1 (0x8F)
28#define MEAS_TSIY_2 (0x90)
29#define MEAS_TSIZ1_1 (0x91)
30#define MEAS_TSIZ1_2 (0x92)
31#define MEAS_TSIZ2_1 (0x93)
32#define MEAS_TSIZ2_2 (0x94)
33
34
35#define MEAS_PD_EN (1 << 3)
36#define MEAS_TSIX_EN (1 << 4)
37#define MEAS_TSIY_EN (1 << 5)
38#define MEAS_TSIZ1_EN (1 << 6)
39#define MEAS_TSIZ2_EN (1 << 7)
40
41struct pm860x_touch {
42 struct input_dev *idev;
43 struct i2c_client *i2c;
44 struct pm860x_chip *chip;
45 int irq;
46 int res_x;
47};
48
49static irqreturn_t pm860x_touch_handler(int irq, void *data)
50{
51 struct pm860x_touch *touch = data;
52 struct pm860x_chip *chip = touch->chip;
53 unsigned char buf[MEAS_LEN];
54 int x, y, pen_down;
55 int z1, z2, rt = 0;
56 int ret;
57
58 ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf);
59 if (ret < 0)
60 goto out;
61
62 pen_down = buf[1] & (1 << 6);
63 x = ((buf[0] & 0xFF) << 4) | (buf[1] & 0x0F);
64 y = ((buf[2] & 0xFF) << 4) | (buf[3] & 0x0F);
65 z1 = ((buf[4] & 0xFF) << 4) | (buf[5] & 0x0F);
66 z2 = ((buf[6] & 0xFF) << 4) | (buf[7] & 0x0F);
67
68 if (pen_down) {
69 if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) {
70 rt = z2 / z1 - 1;
71 rt = (rt * touch->res_x * x) >> ACCURATE_BIT;
72 dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n",
73 z1, z2, rt);
74 }
75 input_report_abs(touch->idev, ABS_X, x);
76 input_report_abs(touch->idev, ABS_Y, y);
77 input_report_abs(touch->idev, ABS_PRESSURE, rt);
78 input_report_key(touch->idev, BTN_TOUCH, 1);
79 dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y);
80 } else {
81 input_report_abs(touch->idev, ABS_PRESSURE, 0);
82 input_report_key(touch->idev, BTN_TOUCH, 0);
83 dev_dbg(chip->dev, "pen release\n");
84 }
85 input_sync(touch->idev);
86
87out:
88 return IRQ_HANDLED;
89}
90
91static int pm860x_touch_open(struct input_dev *dev)
92{
93 struct pm860x_touch *touch = input_get_drvdata(dev);
94 int data, ret;
95
96 data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
97 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
98 ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data);
99 if (ret < 0)
100 goto out;
101 return 0;
102out:
103 return ret;
104}
105
106static void pm860x_touch_close(struct input_dev *dev)
107{
108 struct pm860x_touch *touch = input_get_drvdata(dev);
109 int data;
110
111 data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
112 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
113 pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0);
114}
115
116static int __devinit pm860x_touch_probe(struct platform_device *pdev)
117{
118 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
119 struct pm860x_platform_data *pm860x_pdata = \
120 pdev->dev.parent->platform_data;
121 struct pm860x_touch_pdata *pdata = NULL;
122 struct pm860x_touch *touch;
123 int irq, ret;
124
125 irq = platform_get_irq(pdev, 0);
126 if (irq < 0) {
127 dev_err(&pdev->dev, "No IRQ resource!\n");
128 return -EINVAL;
129 }
130
131 if (!pm860x_pdata) {
132 dev_err(&pdev->dev, "platform data is missing\n");
133 return -EINVAL;
134 }
135
136 pdata = pm860x_pdata->touch;
137 if (!pdata) {
138 dev_err(&pdev->dev, "touchscreen data is missing\n");
139 return -EINVAL;
140 }
141
142 touch = kzalloc(sizeof(struct pm860x_touch), GFP_KERNEL);
143 if (touch == NULL)
144 return -ENOMEM;
145 dev_set_drvdata(&pdev->dev, touch);
146
147 touch->idev = input_allocate_device();
148 if (touch->idev == NULL) {
149 dev_err(&pdev->dev, "Failed to allocate input device!\n");
150 ret = -ENOMEM;
151 goto out;
152 }
153
154 touch->idev->name = "88pm860x-touch";
155 touch->idev->phys = "88pm860x/input0";
156 touch->idev->id.bustype = BUS_I2C;
157 touch->idev->dev.parent = &pdev->dev;
158 touch->idev->open = pm860x_touch_open;
159 touch->idev->close = pm860x_touch_close;
160 touch->chip = chip;
161 touch->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
162 touch->irq = irq + chip->irq_base;
163 touch->res_x = pdata->res_x;
164 input_set_drvdata(touch->idev, touch);
165
166 ret = request_threaded_irq(touch->irq, NULL, pm860x_touch_handler,
167 IRQF_ONESHOT, "touch", touch);
168 if (ret < 0)
169 goto out_irq;
170
171 __set_bit(EV_ABS, touch->idev->evbit);
172 __set_bit(ABS_X, touch->idev->absbit);
173 __set_bit(ABS_Y, touch->idev->absbit);
174 __set_bit(ABS_PRESSURE, touch->idev->absbit);
175 __set_bit(EV_SYN, touch->idev->evbit);
176 __set_bit(EV_KEY, touch->idev->evbit);
177 __set_bit(BTN_TOUCH, touch->idev->keybit);
178
179 input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0);
180 input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0);
181 input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT,
182 0, 0);
183
184 ret = input_register_device(touch->idev);
185 if (ret < 0) {
186 dev_err(chip->dev, "Failed to register touch!\n");
187 goto out_rg;
188 }
189
190 platform_set_drvdata(pdev, touch);
191 return 0;
192out_rg:
193 free_irq(touch->irq, touch);
194out_irq:
195 input_free_device(touch->idev);
196out:
197 kfree(touch);
198 return ret;
199}
200
201static int __devexit pm860x_touch_remove(struct platform_device *pdev)
202{
203 struct pm860x_touch *touch = platform_get_drvdata(pdev);
204
205 input_unregister_device(touch->idev);
206 free_irq(touch->irq, touch);
207 platform_set_drvdata(pdev, NULL);
208 kfree(touch);
209 return 0;
210}
211
212static struct platform_driver pm860x_touch_driver = {
213 .driver = {
214 .name = "88pm860x-touch",
215 .owner = THIS_MODULE,
216 },
217 .probe = pm860x_touch_probe,
218 .remove = __devexit_p(pm860x_touch_remove),
219};
220
221static int __init pm860x_touch_init(void)
222{
223 return platform_driver_register(&pm860x_touch_driver);
224}
225module_init(pm860x_touch_init);
226
227static void __exit pm860x_touch_exit(void)
228{
229 platform_driver_unregister(&pm860x_touch_driver);
230}
231module_exit(pm860x_touch_exit);
232
233MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x");
234MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
235MODULE_LICENSE("GPL");
236MODULE_ALIAS("platform:88pm860x-touch");
237
238
