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1/*
2 * Touchscreen driver for Marvell 88PM860x
3 *
4 * Copyright (C) 2009 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/platform_device.h>
15#include <linux/i2c.h>
16#include <linux/input.h>
17#include <linux/mfd/88pm860x.h>
18#include <linux/slab.h>
19
20#define MEAS_LEN (8)
21#define ACCURATE_BIT (12)
22
23/* touch register */
24#define MEAS_EN3 (0x52)
25
26#define MEAS_TSIX_1 (0x8D)
27#define MEAS_TSIX_2 (0x8E)
28#define MEAS_TSIY_1 (0x8F)
29#define MEAS_TSIY_2 (0x90)
30#define MEAS_TSIZ1_1 (0x91)
31#define MEAS_TSIZ1_2 (0x92)
32#define MEAS_TSIZ2_1 (0x93)
33#define MEAS_TSIZ2_2 (0x94)
34
35/* bit definitions of touch */
36#define MEAS_PD_EN (1 << 3)
37#define MEAS_TSIX_EN (1 << 4)
38#define MEAS_TSIY_EN (1 << 5)
39#define MEAS_TSIZ1_EN (1 << 6)
40#define MEAS_TSIZ2_EN (1 << 7)
41
42struct pm860x_touch {
43 struct input_dev *idev;
44 struct i2c_client *i2c;
45 struct pm860x_chip *chip;
46 int irq;
47 int res_x; /* resistor of Xplate */
48};
49
50static irqreturn_t pm860x_touch_handler(int irq, void *data)
51{
52 struct pm860x_touch *touch = data;
53 struct pm860x_chip *chip = touch->chip;
54 unsigned char buf[MEAS_LEN];
55 int x, y, pen_down;
56 int z1, z2, rt = 0;
57 int ret;
58
59 ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf);
60 if (ret < 0)
61 goto out;
62
63 pen_down = buf[1] & (1 << 6);
64 x = ((buf[0] & 0xFF) << 4) | (buf[1] & 0x0F);
65 y = ((buf[2] & 0xFF) << 4) | (buf[3] & 0x0F);
66 z1 = ((buf[4] & 0xFF) << 4) | (buf[5] & 0x0F);
67 z2 = ((buf[6] & 0xFF) << 4) | (buf[7] & 0x0F);
68
69 if (pen_down) {
70 if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) {
71 rt = z2 / z1 - 1;
72 rt = (rt * touch->res_x * x) >> ACCURATE_BIT;
73 dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n",
74 z1, z2, rt);
75 }
76 input_report_abs(touch->idev, ABS_X, x);
77 input_report_abs(touch->idev, ABS_Y, y);
78 input_report_abs(touch->idev, ABS_PRESSURE, rt);
79 input_report_key(touch->idev, BTN_TOUCH, 1);
80 dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y);
81 } else {
82 input_report_abs(touch->idev, ABS_PRESSURE, 0);
83 input_report_key(touch->idev, BTN_TOUCH, 0);
84 dev_dbg(chip->dev, "pen release\n");
85 }
86 input_sync(touch->idev);
87
88out:
89 return IRQ_HANDLED;
90}
91
92static int pm860x_touch_open(struct input_dev *dev)
93{
94 struct pm860x_touch *touch = input_get_drvdata(dev);
95 int data, ret;
96
97 data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
98 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
99 ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data);
100 if (ret < 0)
101 goto out;
102 return 0;
103out:
104 return ret;
105}
106
107static void pm860x_touch_close(struct input_dev *dev)
108{
109 struct pm860x_touch *touch = input_get_drvdata(dev);
110 int data;
111
112 data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
113 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
114 pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0);
115}
116
117#ifdef CONFIG_OF
118static int pm860x_touch_dt_init(struct platform_device *pdev,
119 struct pm860x_chip *chip,
120 int *res_x)
121{
122 struct device_node *np = pdev->dev.parent->of_node;
123 struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \
124 : chip->companion;
125 int data, n, ret;
126 if (!np)
127 return -ENODEV;
128 np = of_find_node_by_name(np, "touch");
129 if (!np) {
130 dev_err(&pdev->dev, "Can't find touch node\n");
131 return -EINVAL;
132 }
133 /* set GPADC MISC1 register */
134 data = 0;
135 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-prebias", &n))
136 data |= (n << 1) & PM8607_GPADC_PREBIAS_MASK;
137 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-slot-cycle", &n))
138 data |= (n << 3) & PM8607_GPADC_SLOT_CYCLE_MASK;
139 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-off-scale", &n))
140 data |= (n << 5) & PM8607_GPADC_OFF_SCALE_MASK;
141 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-sw-cal", &n))
142 data |= (n << 7) & PM8607_GPADC_SW_CAL_MASK;
143 if (data) {
144 ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data);
145 if (ret < 0)
146 return -EINVAL;
147 }
148 /* set tsi prebias time */
149 if (!of_property_read_u32(np, "marvell,88pm860x-tsi-prebias", &data)) {
150 ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data);
151 if (ret < 0)
152 return -EINVAL;
153 }
154 /* set prebias & prechg time of pen detect */
155 data = 0;
156 if (!of_property_read_u32(np, "marvell,88pm860x-pen-prebias", &n))
157 data |= n & PM8607_PD_PREBIAS_MASK;
158 if (!of_property_read_u32(np, "marvell,88pm860x-pen-prechg", &n))
159 data |= n & PM8607_PD_PRECHG_MASK;
160 if (data) {
161 ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data);
162 if (ret < 0)
163 return -EINVAL;
164 }
165 of_property_read_u32(np, "marvell,88pm860x-resistor-X", res_x);
166 return 0;
167}
168#else
169#define pm860x_touch_dt_init(x, y, z) (-1)
170#endif
171
172static int pm860x_touch_probe(struct platform_device *pdev)
173{
174 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
175 struct pm860x_touch_pdata *pdata = dev_get_platdata(&pdev->dev);
176 struct pm860x_touch *touch;
177 struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \
178 : chip->companion;
179 int irq, ret, res_x = 0, data = 0;
180
181 irq = platform_get_irq(pdev, 0);
182 if (irq < 0) {
183 dev_err(&pdev->dev, "No IRQ resource!\n");
184 return -EINVAL;
185 }
186
187 if (pm860x_touch_dt_init(pdev, chip, &res_x)) {
188 if (pdata) {
189 /* set GPADC MISC1 register */
190 data = 0;
191 data |= (pdata->gpadc_prebias << 1)
192 & PM8607_GPADC_PREBIAS_MASK;
193 data |= (pdata->slot_cycle << 3)
194 & PM8607_GPADC_SLOT_CYCLE_MASK;
195 data |= (pdata->off_scale << 5)
196 & PM8607_GPADC_OFF_SCALE_MASK;
197 data |= (pdata->sw_cal << 7)
198 & PM8607_GPADC_SW_CAL_MASK;
199 if (data) {
200 ret = pm860x_reg_write(i2c,
201 PM8607_GPADC_MISC1, data);
202 if (ret < 0)
203 return -EINVAL;
204 }
205 /* set tsi prebias time */
206 if (pdata->tsi_prebias) {
207 data = pdata->tsi_prebias;
208 ret = pm860x_reg_write(i2c,
209 PM8607_TSI_PREBIAS, data);
210 if (ret < 0)
211 return -EINVAL;
212 }
213 /* set prebias & prechg time of pen detect */
214 data = 0;
215 data |= pdata->pen_prebias
216 & PM8607_PD_PREBIAS_MASK;
217 data |= (pdata->pen_prechg << 5)
218 & PM8607_PD_PRECHG_MASK;
219 if (data) {
220 ret = pm860x_reg_write(i2c,
221 PM8607_PD_PREBIAS, data);
222 if (ret < 0)
223 return -EINVAL;
224 }
225 res_x = pdata->res_x;
226 } else {
227 dev_err(&pdev->dev, "failed to get platform data\n");
228 return -EINVAL;
229 }
230 }
231 /* enable GPADC */
232 ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, PM8607_GPADC_EN,
233 PM8607_GPADC_EN);
234 if (ret)
235 return ret;
236
237 touch = kzalloc(sizeof(struct pm860x_touch), GFP_KERNEL);
238 if (touch == NULL)
239 return -ENOMEM;
240 platform_set_drvdata(pdev, touch);
241
242 touch->idev = input_allocate_device();
243 if (touch->idev == NULL) {
244 dev_err(&pdev->dev, "Failed to allocate input device!\n");
245 ret = -ENOMEM;
246 goto out;
247 }
248
249 touch->idev->name = "88pm860x-touch";
250 touch->idev->phys = "88pm860x/input0";
251 touch->idev->id.bustype = BUS_I2C;
252 touch->idev->dev.parent = &pdev->dev;
253 touch->idev->open = pm860x_touch_open;
254 touch->idev->close = pm860x_touch_close;
255 touch->chip = chip;
256 touch->i2c = i2c;
257 touch->irq = irq;
258 touch->res_x = res_x;
259 input_set_drvdata(touch->idev, touch);
260
261 ret = request_threaded_irq(touch->irq, NULL, pm860x_touch_handler,
262 IRQF_ONESHOT, "touch", touch);
263 if (ret < 0)
264 goto out_irq;
265
266 __set_bit(EV_ABS, touch->idev->evbit);
267 __set_bit(ABS_X, touch->idev->absbit);
268 __set_bit(ABS_Y, touch->idev->absbit);
269 __set_bit(ABS_PRESSURE, touch->idev->absbit);
270 __set_bit(EV_SYN, touch->idev->evbit);
271 __set_bit(EV_KEY, touch->idev->evbit);
272 __set_bit(BTN_TOUCH, touch->idev->keybit);
273
274 input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0);
275 input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0);
276 input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT,
277 0, 0);
278
279 ret = input_register_device(touch->idev);
280 if (ret < 0) {
281 dev_err(chip->dev, "Failed to register touch!\n");
282 goto out_rg;
283 }
284
285 platform_set_drvdata(pdev, touch);
286 return 0;
287out_rg:
288 free_irq(touch->irq, touch);
289out_irq:
290 input_free_device(touch->idev);
291out:
292 kfree(touch);
293 return ret;
294}
295
296static int pm860x_touch_remove(struct platform_device *pdev)
297{
298 struct pm860x_touch *touch = platform_get_drvdata(pdev);
299
300 input_unregister_device(touch->idev);
301 free_irq(touch->irq, touch);
302 kfree(touch);
303 return 0;
304}
305
306static struct platform_driver pm860x_touch_driver = {
307 .driver = {
308 .name = "88pm860x-touch",
309 .owner = THIS_MODULE,
310 },
311 .probe = pm860x_touch_probe,
312 .remove = pm860x_touch_remove,
313};
314module_platform_driver(pm860x_touch_driver);
315
316MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x");
317MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
318MODULE_LICENSE("GPL");
319MODULE_ALIAS("platform:88pm860x-touch");
320
1/*
2 * Touchscreen driver for Marvell 88PM860x
3 *
4 * Copyright (C) 2009 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
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/* touch register */
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/* bit definitions of touch */
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; /* resistor of Xplate */
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