2 * Touchscreen driver for Marvell 88PM860x
4 * Copyright (C) 2009 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
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.
11 #include <linux/kernel.h>
12 #include <linux/module.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 #include <linux/device.h>
22 #define ACCURATE_BIT (12)
25 #define MEAS_EN3 (0x52)
27 #define MEAS_TSIX_1 (0x8D)
28 #define MEAS_TSIX_2 (0x8E)
29 #define MEAS_TSIY_1 (0x8F)
30 #define MEAS_TSIY_2 (0x90)
31 #define MEAS_TSIZ1_1 (0x91)
32 #define MEAS_TSIZ1_2 (0x92)
33 #define MEAS_TSIZ2_1 (0x93)
34 #define MEAS_TSIZ2_2 (0x94)
36 /* bit definitions of touch */
37 #define MEAS_PD_EN (1 << 3)
38 #define MEAS_TSIX_EN (1 << 4)
39 #define MEAS_TSIY_EN (1 << 5)
40 #define MEAS_TSIZ1_EN (1 << 6)
41 #define MEAS_TSIZ2_EN (1 << 7)
44 struct input_dev *idev;
45 struct i2c_client *i2c;
46 struct pm860x_chip *chip;
48 int res_x; /* resistor of Xplate */
51 static irqreturn_t pm860x_touch_handler(int irq, void *data)
53 struct pm860x_touch *touch = data;
54 struct pm860x_chip *chip = touch->chip;
55 unsigned char buf[MEAS_LEN];
60 ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf);
64 pen_down = buf[1] & (1 << 6);
65 x = ((buf[0] & 0xFF) << 4) | (buf[1] & 0x0F);
66 y = ((buf[2] & 0xFF) << 4) | (buf[3] & 0x0F);
67 z1 = ((buf[4] & 0xFF) << 4) | (buf[5] & 0x0F);
68 z2 = ((buf[6] & 0xFF) << 4) | (buf[7] & 0x0F);
71 if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) {
73 rt = (rt * touch->res_x * x) >> ACCURATE_BIT;
74 dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n",
77 input_report_abs(touch->idev, ABS_X, x);
78 input_report_abs(touch->idev, ABS_Y, y);
79 input_report_abs(touch->idev, ABS_PRESSURE, rt);
80 input_report_key(touch->idev, BTN_TOUCH, 1);
81 dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y);
83 input_report_abs(touch->idev, ABS_PRESSURE, 0);
84 input_report_key(touch->idev, BTN_TOUCH, 0);
85 dev_dbg(chip->dev, "pen release\n");
87 input_sync(touch->idev);
93 static int pm860x_touch_open(struct input_dev *dev)
95 struct pm860x_touch *touch = input_get_drvdata(dev);
98 data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
99 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
100 ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data);
108 static void pm860x_touch_close(struct input_dev *dev)
110 struct pm860x_touch *touch = input_get_drvdata(dev);
113 data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN
114 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN;
115 pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0);
119 static int pm860x_touch_dt_init(struct platform_device *pdev,
120 struct pm860x_chip *chip,
123 struct device_node *np = pdev->dev.parent->of_node;
124 struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \
129 np = of_find_node_by_name(np, "touch");
131 dev_err(&pdev->dev, "Can't find touch node\n");
134 /* set GPADC MISC1 register */
136 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-prebias", &n))
137 data |= (n << 1) & PM8607_GPADC_PREBIAS_MASK;
138 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-slot-cycle", &n))
139 data |= (n << 3) & PM8607_GPADC_SLOT_CYCLE_MASK;
140 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-off-scale", &n))
141 data |= (n << 5) & PM8607_GPADC_OFF_SCALE_MASK;
142 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-sw-cal", &n))
143 data |= (n << 7) & PM8607_GPADC_SW_CAL_MASK;
145 ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data);
149 /* set tsi prebias time */
150 if (!of_property_read_u32(np, "marvell,88pm860x-tsi-prebias", &data)) {
151 ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data);
155 /* set prebias & prechg time of pen detect */
157 if (!of_property_read_u32(np, "marvell,88pm860x-pen-prebias", &n))
158 data |= n & PM8607_PD_PREBIAS_MASK;
159 if (!of_property_read_u32(np, "marvell,88pm860x-pen-prechg", &n))
160 data |= n & PM8607_PD_PRECHG_MASK;
162 ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data);
166 of_property_read_u32(np, "marvell,88pm860x-resistor-X", res_x);
170 #define pm860x_touch_dt_init(x, y, z) (-1)
173 static int pm860x_touch_probe(struct platform_device *pdev)
175 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
176 struct pm860x_touch_pdata *pdata = dev_get_platdata(&pdev->dev);
177 struct pm860x_touch *touch;
178 struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \
180 int irq, ret, res_x = 0, data = 0;
182 irq = platform_get_irq(pdev, 0);
184 dev_err(&pdev->dev, "No IRQ resource!\n");
188 if (pm860x_touch_dt_init(pdev, chip, &res_x)) {
190 /* set GPADC MISC1 register */
192 data |= (pdata->gpadc_prebias << 1)
193 & PM8607_GPADC_PREBIAS_MASK;
194 data |= (pdata->slot_cycle << 3)
195 & PM8607_GPADC_SLOT_CYCLE_MASK;
196 data |= (pdata->off_scale << 5)
197 & PM8607_GPADC_OFF_SCALE_MASK;
198 data |= (pdata->sw_cal << 7)
199 & PM8607_GPADC_SW_CAL_MASK;
201 ret = pm860x_reg_write(i2c,
202 PM8607_GPADC_MISC1, data);
206 /* set tsi prebias time */
207 if (pdata->tsi_prebias) {
208 data = pdata->tsi_prebias;
209 ret = pm860x_reg_write(i2c,
210 PM8607_TSI_PREBIAS, data);
214 /* set prebias & prechg time of pen detect */
216 data |= pdata->pen_prebias
217 & PM8607_PD_PREBIAS_MASK;
218 data |= (pdata->pen_prechg << 5)
219 & PM8607_PD_PRECHG_MASK;
221 ret = pm860x_reg_write(i2c,
222 PM8607_PD_PREBIAS, data);
226 res_x = pdata->res_x;
228 dev_err(&pdev->dev, "failed to get platform data\n");
233 ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, PM8607_GPADC_EN,
238 touch = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_touch),
243 platform_set_drvdata(pdev, touch);
245 touch->idev = devm_input_allocate_device(&pdev->dev);
247 dev_err(&pdev->dev, "Failed to allocate input device!\n");
251 touch->idev->name = "88pm860x-touch";
252 touch->idev->phys = "88pm860x/input0";
253 touch->idev->id.bustype = BUS_I2C;
254 touch->idev->dev.parent = &pdev->dev;
255 touch->idev->open = pm860x_touch_open;
256 touch->idev->close = pm860x_touch_close;
260 touch->res_x = res_x;
261 input_set_drvdata(touch->idev, touch);
263 ret = devm_request_threaded_irq(&pdev->dev, touch->irq, NULL,
264 pm860x_touch_handler, IRQF_ONESHOT,
269 __set_bit(EV_ABS, touch->idev->evbit);
270 __set_bit(ABS_X, touch->idev->absbit);
271 __set_bit(ABS_Y, touch->idev->absbit);
272 __set_bit(ABS_PRESSURE, touch->idev->absbit);
273 __set_bit(EV_SYN, touch->idev->evbit);
274 __set_bit(EV_KEY, touch->idev->evbit);
275 __set_bit(BTN_TOUCH, touch->idev->keybit);
277 input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0);
278 input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0);
279 input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT,
282 ret = input_register_device(touch->idev);
284 dev_err(chip->dev, "Failed to register touch!\n");
288 platform_set_drvdata(pdev, touch);
292 static struct platform_driver pm860x_touch_driver = {
294 .name = "88pm860x-touch",
295 .owner = THIS_MODULE,
297 .probe = pm860x_touch_probe,
299 module_platform_driver(pm860x_touch_driver);
301 MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x");
302 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
303 MODULE_LICENSE("GPL");
304 MODULE_ALIAS("platform:88pm860x-touch");