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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
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
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;
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
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
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
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 = pdev->dev.platform_data;
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
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
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
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
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 dev_set_drvdata(&pdev->dev, 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 platform_set_drvdata(pdev, NULL);
303 kfree(touch);
304 return 0;
305}
306
307static struct platform_driver pm860x_touch_driver = {
308 .driver = {
309 .name = "88pm860x-touch",
310 .owner = THIS_MODULE,
311 },
312 .probe = pm860x_touch_probe,
313 .remove = pm860x_touch_remove,
314};
315module_platform_driver(pm860x_touch_driver);
316
317MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x");
318MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
319MODULE_LICENSE("GPL");
320MODULE_ALIAS("platform:88pm860x-touch");
321
322
