2 * TSI driver for Dialog DA9052
4 * Copyright(c) 2012 Dialog Semiconductor Ltd.
6 * Author: David Dajun Chen <dchen@diasemi.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
14 #include <linux/module.h>
15 #include <linux/input.h>
16 #include <linux/delay.h>
17 #include <linux/platform_device.h>
18 #include <linux/interrupt.h>
20 #include <linux/mfd/da9052/reg.h>
21 #include <linux/mfd/da9052/da9052.h>
23 #define TSI_PEN_DOWN_STATUS 0x40
26 struct da9052 *da9052;
27 struct input_dev *dev;
28 struct delayed_work ts_pen_work;
34 static void da9052_ts_adc_toggle(struct da9052_tsi *tsi, bool on)
36 da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0, on);
40 static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data)
42 struct da9052_tsi *tsi = data;
45 /* Mask PEN_DOWN event and unmask TSI_READY event */
46 da9052_disable_irq_nosync(tsi->da9052, DA9052_IRQ_PENDOWN);
47 da9052_enable_irq(tsi->da9052, DA9052_IRQ_TSIREADY);
49 da9052_ts_adc_toggle(tsi, true);
51 schedule_delayed_work(&tsi->ts_pen_work, HZ / 50);
57 static void da9052_ts_read(struct da9052_tsi *tsi)
59 struct input_dev *input = tsi->dev;
64 ret = da9052_reg_read(tsi->da9052, DA9052_TSI_X_MSB_REG);
70 ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Y_MSB_REG);
76 ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Z_MSB_REG);
82 ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);
88 x = ((x << 2) & 0x3fc) | (v & 0x3);
89 y = ((y << 2) & 0x3fc) | ((v & 0xc) >> 2);
90 z = ((z << 2) & 0x3fc) | ((v & 0x30) >> 4);
92 input_report_key(input, BTN_TOUCH, 1);
93 input_report_abs(input, ABS_X, x);
94 input_report_abs(input, ABS_Y, y);
95 input_report_abs(input, ABS_PRESSURE, z);
99 static irqreturn_t da9052_ts_datardy_irq(int irq, void *data)
101 struct da9052_tsi *tsi = data;
108 static void da9052_ts_pen_work(struct work_struct *work)
110 struct da9052_tsi *tsi = container_of(work, struct da9052_tsi,
113 int ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);
114 if (ret < 0 || (ret & TSI_PEN_DOWN_STATUS)) {
115 /* Pen is still DOWN (or read error) */
116 schedule_delayed_work(&tsi->ts_pen_work, HZ / 50);
118 struct input_dev *input = tsi->dev;
121 da9052_ts_adc_toggle(tsi, false);
124 input_report_key(input, BTN_TOUCH, 0);
125 input_report_abs(input, ABS_PRESSURE, 0);
129 * FIXME: Fixes the unhandled irq issue when quick
130 * pen down and pen up events occurs
132 ret = da9052_reg_update(tsi->da9052,
133 DA9052_EVENT_B_REG, 0xC0, 0xC0);
137 /* Mask TSI_READY event and unmask PEN_DOWN event */
138 da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY);
139 da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
144 static int da9052_ts_configure_gpio(struct da9052 *da9052)
148 error = da9052_reg_update(da9052, DA9052_GPIO_2_3_REG, 0x30, 0);
152 error = da9052_reg_update(da9052, DA9052_GPIO_4_5_REG, 0x33, 0);
156 error = da9052_reg_update(da9052, DA9052_GPIO_6_7_REG, 0x33, 0);
163 static int da9052_configure_tsi(struct da9052_tsi *tsi)
167 error = da9052_ts_configure_gpio(tsi->da9052);
171 /* Measure TSI sample every 1ms */
172 error = da9052_reg_update(tsi->da9052, DA9052_ADC_CONT_REG,
177 /* TSI_DELAY: 3 slots, TSI_SKIP: 0 slots, TSI_MODE: XYZP */
178 error = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 0xFC, 0xC0);
182 /* Supply TSIRef through LD09 */
183 error = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59);
190 static int da9052_ts_input_open(struct input_dev *input_dev)
192 struct da9052_tsi *tsi = input_get_drvdata(input_dev);
194 tsi->stopped = false;
197 /* Unmask PEN_DOWN event */
198 da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
200 /* Enable Pen Detect Circuit */
201 return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG,
205 static void da9052_ts_input_close(struct input_dev *input_dev)
207 struct da9052_tsi *tsi = input_get_drvdata(input_dev);
211 da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
212 cancel_delayed_work_sync(&tsi->ts_pen_work);
215 da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY);
216 da9052_ts_adc_toggle(tsi, false);
219 * If ADC was on that means that pendwn IRQ was disabled
220 * twice and we need to enable it to keep enable/disable
221 * counter balanced. IRQ is still off though.
223 da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
226 /* Disable Pen Detect Circuit */
227 da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0);
230 static int da9052_ts_probe(struct platform_device *pdev)
232 struct da9052 *da9052;
233 struct da9052_tsi *tsi;
234 struct input_dev *input_dev;
237 da9052 = dev_get_drvdata(pdev->dev.parent);
241 tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL);
242 input_dev = input_allocate_device();
243 if (!tsi || !input_dev) {
248 tsi->da9052 = da9052;
249 tsi->dev = input_dev;
251 INIT_DELAYED_WORK(&tsi->ts_pen_work, da9052_ts_pen_work);
253 input_dev->id.version = 0x0101;
254 input_dev->id.vendor = 0x15B6;
255 input_dev->id.product = 0x9052;
256 input_dev->name = "Dialog DA9052 TouchScreen Driver";
257 input_dev->dev.parent = &pdev->dev;
258 input_dev->open = da9052_ts_input_open;
259 input_dev->close = da9052_ts_input_close;
261 __set_bit(EV_ABS, input_dev->evbit);
262 __set_bit(EV_KEY, input_dev->evbit);
263 __set_bit(BTN_TOUCH, input_dev->keybit);
265 input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0);
266 input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0);
267 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 1023, 0, 0);
269 input_set_drvdata(input_dev, tsi);
271 /* Disable Pen Detect Circuit */
272 da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0);
275 da9052_ts_adc_toggle(tsi, false);
277 error = da9052_request_irq(tsi->da9052, DA9052_IRQ_PENDOWN,
278 "pendown-irq", da9052_ts_pendwn_irq, tsi);
280 dev_err(tsi->da9052->dev,
281 "Failed to register PENDWN IRQ: %d\n", error);
285 error = da9052_request_irq(tsi->da9052, DA9052_IRQ_TSIREADY,
286 "tsiready-irq", da9052_ts_datardy_irq, tsi);
288 dev_err(tsi->da9052->dev,
289 "Failed to register TSIRDY IRQ :%d\n", error);
290 goto err_free_pendwn_irq;
293 /* Mask PEN_DOWN and TSI_READY events */
294 da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN);
295 da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY);
297 error = da9052_configure_tsi(tsi);
299 goto err_free_datardy_irq;
301 error = input_register_device(tsi->dev);
303 goto err_free_datardy_irq;
305 platform_set_drvdata(pdev, tsi);
309 err_free_datardy_irq:
310 da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi);
312 da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi);
315 input_free_device(input_dev);
320 static int da9052_ts_remove(struct platform_device *pdev)
322 struct da9052_tsi *tsi = platform_get_drvdata(pdev);
324 da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19);
326 da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi);
327 da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi);
329 input_unregister_device(tsi->dev);
332 platform_set_drvdata(pdev, NULL);
337 static struct platform_driver da9052_tsi_driver = {
338 .probe = da9052_ts_probe,
339 .remove = da9052_ts_remove,
341 .name = "da9052-tsi",
342 .owner = THIS_MODULE,
346 module_platform_driver(da9052_tsi_driver);
348 MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9052");
349 MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");
350 MODULE_LICENSE("GPL");
351 MODULE_ALIAS("platform:da9052-tsi");