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Linux/drivers/input/touchscreen/88pm860x-ts.c

  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 #include <linux/device.h>
 20 
 21 #define MEAS_LEN                (8)
 22 #define ACCURATE_BIT            (12)
 23 
 24 /* touch register */
 25 #define MEAS_EN3                (0x52)
 26 
 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)
 35 
 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)
 42 
 43 struct pm860x_touch {
 44         struct input_dev *idev;
 45         struct i2c_client *i2c;
 46         struct pm860x_chip *chip;
 47         int irq;
 48         int res_x;              /* resistor of Xplate */
 49 };
 50 
 51 static irqreturn_t pm860x_touch_handler(int irq, void *data)
 52 {
 53         struct pm860x_touch *touch = data;
 54         struct pm860x_chip *chip = touch->chip;
 55         unsigned char buf[MEAS_LEN];
 56         int x, y, pen_down;
 57         int z1, z2, rt = 0;
 58         int ret;
 59 
 60         ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf);
 61         if (ret < 0)
 62                 goto out;
 63 
 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);
 69 
 70         if (pen_down) {
 71                 if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) {
 72                         rt = z2 / z1 - 1;
 73                         rt = (rt * touch->res_x * x) >> ACCURATE_BIT;
 74                         dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n",
 75                                 z1, z2, rt);
 76                 }
 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);
 82         } else {
 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");
 86         }
 87         input_sync(touch->idev);
 88 
 89 out:
 90         return IRQ_HANDLED;
 91 }
 92 
 93 static int pm860x_touch_open(struct input_dev *dev)
 94 {
 95         struct pm860x_touch *touch = input_get_drvdata(dev);
 96         int data, ret;
 97 
 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);
101         if (ret < 0)
102                 goto out;
103         return 0;
104 out:
105         return ret;
106 }
107 
108 static void pm860x_touch_close(struct input_dev *dev)
109 {
110         struct pm860x_touch *touch = input_get_drvdata(dev);
111         int data;
112 
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);
116 }
117 
118 #ifdef CONFIG_OF
119 static int pm860x_touch_dt_init(struct platform_device *pdev,
120                                           struct pm860x_chip *chip,
121                                           int *res_x)
122 {
123         struct device_node *np = pdev->dev.parent->of_node;
124         struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \
125                                  : chip->companion;
126         int data, n, ret;
127         if (!np)
128                 return -ENODEV;
129         np = of_find_node_by_name(np, "touch");
130         if (!np) {
131                 dev_err(&pdev->dev, "Can't find touch node\n");
132                 return -EINVAL;
133         }
134         /* set GPADC MISC1 register */
135         data = 0;
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;
144         if (data) {
145                 ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data);
146                 if (ret < 0)
147                         return -EINVAL;
148         }
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);
152                 if (ret < 0)
153                         return -EINVAL;
154         }
155         /* set prebias & prechg time of pen detect */
156         data = 0;
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;
161         if (data) {
162                 ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data);
163                 if (ret < 0)
164                         return -EINVAL;
165         }
166         of_property_read_u32(np, "marvell,88pm860x-resistor-X", res_x);
167         return 0;
168 }
169 #else
170 #define pm860x_touch_dt_init(x, y, z)   (-1)
171 #endif
172 
173 static int pm860x_touch_probe(struct platform_device *pdev)
174 {
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 \
179                                  : chip->companion;
180         int irq, ret, res_x = 0, data = 0;
181 
182         irq = platform_get_irq(pdev, 0);
183         if (irq < 0) {
184                 dev_err(&pdev->dev, "No IRQ resource!\n");
185                 return -EINVAL;
186         }
187 
188         if (pm860x_touch_dt_init(pdev, chip, &res_x)) {
189                 if (pdata) {
190                         /* set GPADC MISC1 register */
191                         data = 0;
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;
200                         if (data) {
201                                 ret = pm860x_reg_write(i2c,
202                                         PM8607_GPADC_MISC1, data);
203                                 if (ret < 0)
204                                         return -EINVAL;
205                         }
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);
211                                 if (ret < 0)
212                                         return -EINVAL;
213                         }
214                         /* set prebias & prechg time of pen detect */
215                         data = 0;
216                         data |= pdata->pen_prebias
217                                 & PM8607_PD_PREBIAS_MASK;
218                         data |= (pdata->pen_prechg << 5)
219                                 & PM8607_PD_PRECHG_MASK;
220                         if (data) {
221                                 ret = pm860x_reg_write(i2c,
222                                         PM8607_PD_PREBIAS, data);
223                                 if (ret < 0)
224                                         return -EINVAL;
225                         }
226                         res_x = pdata->res_x;
227                 } else {
228                         dev_err(&pdev->dev, "failed to get platform data\n");
229                         return -EINVAL;
230                 }
231         }
232         /* enable GPADC */
233         ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, PM8607_GPADC_EN,
234                               PM8607_GPADC_EN);
235         if (ret)
236                 return ret;
237 
238         touch = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_touch),
239                              GFP_KERNEL);
240         if (!touch)
241                 return -ENOMEM;
242 
243         platform_set_drvdata(pdev, touch);
244 
245         touch->idev = devm_input_allocate_device(&pdev->dev);
246         if (!touch->idev) {
247                 dev_err(&pdev->dev, "Failed to allocate input device!\n");
248                 return -ENOMEM;
249         }
250 
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;
257         touch->chip = chip;
258         touch->i2c = i2c;
259         touch->irq = irq;
260         touch->res_x = res_x;
261         input_set_drvdata(touch->idev, touch);
262 
263         ret = devm_request_threaded_irq(&pdev->dev, touch->irq, NULL,
264                                         pm860x_touch_handler, IRQF_ONESHOT,
265                                         "touch", touch);
266         if (ret < 0)
267                 return ret;
268 
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);
276 
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,
280                                 0, 0);
281 
282         ret = input_register_device(touch->idev);
283         if (ret < 0) {
284                 dev_err(chip->dev, "Failed to register touch!\n");
285                 return ret;
286         }
287 
288         platform_set_drvdata(pdev, touch);
289         return 0;
290 }
291 
292 static struct platform_driver pm860x_touch_driver = {
293         .driver = {
294                 .name   = "88pm860x-touch",
295                 .owner  = THIS_MODULE,
296         },
297         .probe  = pm860x_touch_probe,
298 };
299 module_platform_driver(pm860x_touch_driver);
300 
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");
305 
306 

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