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1 | // SPDX-License-Identifier: GPL-2.0-or-later | |
2 | /* | |
3 | * TSI driver for Dialog DA9052 | |
4 | * | |
5 | * Copyright(c) 2012 Dialog Semiconductor Ltd. | |
6 | * | |
7 | * Author: David Dajun Chen <dchen@diasemi.com> | |
8 | */ | |
9 | #include <linux/module.h> | |
10 | #include <linux/input.h> | |
11 | #include <linux/delay.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/interrupt.h> | |
14 | ||
15 | #include <linux/mfd/da9052/reg.h> | |
16 | #include <linux/mfd/da9052/da9052.h> | |
17 | ||
18 | #define TSI_PEN_DOWN_STATUS 0x40 | |
19 | ||
20 | struct da9052_tsi { | |
21 | struct da9052 *da9052; | |
22 | struct input_dev *dev; | |
23 | struct delayed_work ts_pen_work; | |
24 | bool stopped; | |
25 | bool adc_on; | |
26 | }; | |
27 | ||
28 | static void da9052_ts_adc_toggle(struct da9052_tsi *tsi, bool on) | |
29 | { | |
30 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0, on); | |
31 | tsi->adc_on = on; | |
32 | } | |
33 | ||
34 | static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data) | |
35 | { | |
36 | struct da9052_tsi *tsi = data; | |
37 | ||
38 | if (!tsi->stopped) { | |
39 | /* Mask PEN_DOWN event and unmask TSI_READY event */ | |
40 | da9052_disable_irq_nosync(tsi->da9052, DA9052_IRQ_PENDOWN); | |
41 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); | |
42 | ||
43 | da9052_ts_adc_toggle(tsi, true); | |
44 | ||
45 | schedule_delayed_work(&tsi->ts_pen_work, HZ / 50); | |
46 | } | |
47 | ||
48 | return IRQ_HANDLED; | |
49 | } | |
50 | ||
51 | static void da9052_ts_read(struct da9052_tsi *tsi) | |
52 | { | |
53 | struct input_dev *input = tsi->dev; | |
54 | int ret; | |
55 | u16 x, y, z; | |
56 | u8 v; | |
57 | ||
58 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_X_MSB_REG); | |
59 | if (ret < 0) | |
60 | return; | |
61 | ||
62 | x = (u16) ret; | |
63 | ||
64 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Y_MSB_REG); | |
65 | if (ret < 0) | |
66 | return; | |
67 | ||
68 | y = (u16) ret; | |
69 | ||
70 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Z_MSB_REG); | |
71 | if (ret < 0) | |
72 | return; | |
73 | ||
74 | z = (u16) ret; | |
75 | ||
76 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG); | |
77 | if (ret < 0) | |
78 | return; | |
79 | ||
80 | v = (u8) ret; | |
81 | ||
82 | x = ((x << 2) & 0x3fc) | (v & 0x3); | |
83 | y = ((y << 2) & 0x3fc) | ((v & 0xc) >> 2); | |
84 | z = ((z << 2) & 0x3fc) | ((v & 0x30) >> 4); | |
85 | ||
86 | input_report_key(input, BTN_TOUCH, 1); | |
87 | input_report_abs(input, ABS_X, x); | |
88 | input_report_abs(input, ABS_Y, y); | |
89 | input_report_abs(input, ABS_PRESSURE, z); | |
90 | input_sync(input); | |
91 | } | |
92 | ||
93 | static irqreturn_t da9052_ts_datardy_irq(int irq, void *data) | |
94 | { | |
95 | struct da9052_tsi *tsi = data; | |
96 | ||
97 | da9052_ts_read(tsi); | |
98 | ||
99 | return IRQ_HANDLED; | |
100 | } | |
101 | ||
102 | static void da9052_ts_pen_work(struct work_struct *work) | |
103 | { | |
104 | struct da9052_tsi *tsi = container_of(work, struct da9052_tsi, | |
105 | ts_pen_work.work); | |
106 | if (!tsi->stopped) { | |
107 | int ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG); | |
108 | if (ret < 0 || (ret & TSI_PEN_DOWN_STATUS)) { | |
109 | /* Pen is still DOWN (or read error) */ | |
110 | schedule_delayed_work(&tsi->ts_pen_work, HZ / 50); | |
111 | } else { | |
112 | struct input_dev *input = tsi->dev; | |
113 | ||
114 | /* Pen UP */ | |
115 | da9052_ts_adc_toggle(tsi, false); | |
116 | ||
117 | /* Report Pen UP */ | |
118 | input_report_key(input, BTN_TOUCH, 0); | |
119 | input_report_abs(input, ABS_PRESSURE, 0); | |
120 | input_sync(input); | |
121 | ||
122 | /* | |
123 | * FIXME: Fixes the unhandled irq issue when quick | |
124 | * pen down and pen up events occurs | |
125 | */ | |
126 | ret = da9052_reg_update(tsi->da9052, | |
127 | DA9052_EVENT_B_REG, 0xC0, 0xC0); | |
128 | if (ret < 0) | |
129 | return; | |
130 | ||
131 | /* Mask TSI_READY event and unmask PEN_DOWN event */ | |
132 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); | |
133 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); | |
134 | } | |
135 | } | |
136 | } | |
137 | ||
138 | static int da9052_ts_configure_gpio(struct da9052 *da9052) | |
139 | { | |
140 | int error; | |
141 | ||
142 | error = da9052_reg_update(da9052, DA9052_GPIO_2_3_REG, 0x30, 0); | |
143 | if (error < 0) | |
144 | return error; | |
145 | ||
146 | error = da9052_reg_update(da9052, DA9052_GPIO_4_5_REG, 0x33, 0); | |
147 | if (error < 0) | |
148 | return error; | |
149 | ||
150 | error = da9052_reg_update(da9052, DA9052_GPIO_6_7_REG, 0x33, 0); | |
151 | if (error < 0) | |
152 | return error; | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static int da9052_configure_tsi(struct da9052_tsi *tsi) | |
158 | { | |
159 | int error; | |
160 | ||
161 | error = da9052_ts_configure_gpio(tsi->da9052); | |
162 | if (error) | |
163 | return error; | |
164 | ||
165 | /* Measure TSI sample every 1ms */ | |
166 | error = da9052_reg_update(tsi->da9052, DA9052_ADC_CONT_REG, | |
167 | 1 << 6, 1 << 6); | |
168 | if (error < 0) | |
169 | return error; | |
170 | ||
171 | /* TSI_DELAY: 3 slots, TSI_SKIP: 0 slots, TSI_MODE: XYZP */ | |
172 | error = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 0xFC, 0xC0); | |
173 | if (error < 0) | |
174 | return error; | |
175 | ||
176 | /* Supply TSIRef through LD09 */ | |
177 | error = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59); | |
178 | if (error < 0) | |
179 | return error; | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | static int da9052_ts_input_open(struct input_dev *input_dev) | |
185 | { | |
186 | struct da9052_tsi *tsi = input_get_drvdata(input_dev); | |
187 | ||
188 | tsi->stopped = false; | |
189 | mb(); | |
190 | ||
191 | /* Unmask PEN_DOWN event */ | |
192 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); | |
193 | ||
194 | /* Enable Pen Detect Circuit */ | |
195 | return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, | |
196 | 1 << 1, 1 << 1); | |
197 | } | |
198 | ||
199 | static void da9052_ts_input_close(struct input_dev *input_dev) | |
200 | { | |
201 | struct da9052_tsi *tsi = input_get_drvdata(input_dev); | |
202 | ||
203 | tsi->stopped = true; | |
204 | mb(); | |
205 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); | |
206 | cancel_delayed_work_sync(&tsi->ts_pen_work); | |
207 | ||
208 | if (tsi->adc_on) { | |
209 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); | |
210 | da9052_ts_adc_toggle(tsi, false); | |
211 | ||
212 | /* | |
213 | * If ADC was on that means that pendwn IRQ was disabled | |
214 | * twice and we need to enable it to keep enable/disable | |
215 | * counter balanced. IRQ is still off though. | |
216 | */ | |
217 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); | |
218 | } | |
219 | ||
220 | /* Disable Pen Detect Circuit */ | |
221 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0); | |
222 | } | |
223 | ||
224 | static int da9052_ts_probe(struct platform_device *pdev) | |
225 | { | |
226 | struct da9052 *da9052; | |
227 | struct da9052_tsi *tsi; | |
228 | struct input_dev *input_dev; | |
229 | int error; | |
230 | ||
231 | da9052 = dev_get_drvdata(pdev->dev.parent); | |
232 | if (!da9052) | |
233 | return -EINVAL; | |
234 | ||
235 | tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL); | |
236 | input_dev = input_allocate_device(); | |
237 | if (!tsi || !input_dev) { | |
238 | error = -ENOMEM; | |
239 | goto err_free_mem; | |
240 | } | |
241 | ||
242 | tsi->da9052 = da9052; | |
243 | tsi->dev = input_dev; | |
244 | tsi->stopped = true; | |
245 | INIT_DELAYED_WORK(&tsi->ts_pen_work, da9052_ts_pen_work); | |
246 | ||
247 | input_dev->id.version = 0x0101; | |
248 | input_dev->id.vendor = 0x15B6; | |
249 | input_dev->id.product = 0x9052; | |
250 | input_dev->name = "Dialog DA9052 TouchScreen Driver"; | |
251 | input_dev->dev.parent = &pdev->dev; | |
252 | input_dev->open = da9052_ts_input_open; | |
253 | input_dev->close = da9052_ts_input_close; | |
254 | ||
255 | __set_bit(EV_ABS, input_dev->evbit); | |
256 | __set_bit(EV_KEY, input_dev->evbit); | |
257 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
258 | ||
259 | input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0); | |
260 | input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0); | |
261 | input_set_abs_params(input_dev, ABS_PRESSURE, 0, 1023, 0, 0); | |
262 | ||
263 | input_set_drvdata(input_dev, tsi); | |
264 | ||
265 | /* Disable Pen Detect Circuit */ | |
266 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0); | |
267 | ||
268 | /* Disable ADC */ | |
269 | da9052_ts_adc_toggle(tsi, false); | |
270 | ||
271 | error = da9052_request_irq(tsi->da9052, DA9052_IRQ_PENDOWN, | |
272 | "pendown-irq", da9052_ts_pendwn_irq, tsi); | |
273 | if (error) { | |
274 | dev_err(tsi->da9052->dev, | |
275 | "Failed to register PENDWN IRQ: %d\n", error); | |
276 | goto err_free_mem; | |
277 | } | |
278 | ||
279 | error = da9052_request_irq(tsi->da9052, DA9052_IRQ_TSIREADY, | |
280 | "tsiready-irq", da9052_ts_datardy_irq, tsi); | |
281 | if (error) { | |
282 | dev_err(tsi->da9052->dev, | |
283 | "Failed to register TSIRDY IRQ :%d\n", error); | |
284 | goto err_free_pendwn_irq; | |
285 | } | |
286 | ||
287 | /* Mask PEN_DOWN and TSI_READY events */ | |
288 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); | |
289 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); | |
290 | ||
291 | error = da9052_configure_tsi(tsi); | |
292 | if (error) | |
293 | goto err_free_datardy_irq; | |
294 | ||
295 | error = input_register_device(tsi->dev); | |
296 | if (error) | |
297 | goto err_free_datardy_irq; | |
298 | ||
299 | platform_set_drvdata(pdev, tsi); | |
300 | ||
301 | return 0; | |
302 | ||
303 | err_free_datardy_irq: | |
304 | da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi); | |
305 | err_free_pendwn_irq: | |
306 | da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi); | |
307 | err_free_mem: | |
308 | kfree(tsi); | |
309 | input_free_device(input_dev); | |
310 | ||
311 | return error; | |
312 | } | |
313 | ||
314 | static int da9052_ts_remove(struct platform_device *pdev) | |
315 | { | |
316 | struct da9052_tsi *tsi = platform_get_drvdata(pdev); | |
317 | ||
318 | da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19); | |
319 | ||
320 | da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi); | |
321 | da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi); | |
322 | ||
323 | input_unregister_device(tsi->dev); | |
324 | kfree(tsi); | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | static struct platform_driver da9052_tsi_driver = { | |
330 | .probe = da9052_ts_probe, | |
331 | .remove = da9052_ts_remove, | |
332 | .driver = { | |
333 | .name = "da9052-tsi", | |
334 | }, | |
335 | }; | |
336 | ||
337 | module_platform_driver(da9052_tsi_driver); | |
338 | ||
339 | MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9052"); | |
340 | MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>"); | |
341 | MODULE_LICENSE("GPL"); | |
342 | MODULE_ALIAS("platform:da9052-tsi"); |