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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 
 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 
 42 struct 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 
 50 static 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 
 88 out:
 89         return IRQ_HANDLED;
 90 }
 91 
 92 static 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;
103 out:
104         return ret;
105 }
106 
107 static 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
118 static 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 
172 static 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;
287 out_rg:
288         free_irq(touch->irq, touch);
289 out_irq:
290         input_free_device(touch->idev);
291 out:
292         kfree(touch);
293         return ret;
294 }
295 
296 static 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 
306 static 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 };
314 module_platform_driver(pm860x_touch_driver);
315 
316 MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x");
317 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
318 MODULE_LICENSE("GPL");
319 MODULE_ALIAS("platform:88pm860x-touch");
320 
321 

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