Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 1 | /* |
| 2 | * TSI driver for Dialog DA9052 |
| 3 | * |
| 4 | * Copyright(c) 2012 Dialog Semiconductor Ltd. |
| 5 | * |
| 6 | * Author: David Dajun Chen <dchen@diasemi.com> |
| 7 | * |
| 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. |
| 12 | * |
| 13 | */ |
| 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> |
| 19 | |
| 20 | #include <linux/mfd/da9052/reg.h> |
| 21 | #include <linux/mfd/da9052/da9052.h> |
| 22 | |
| 23 | #define TSI_PEN_DOWN_STATUS 0x40 |
| 24 | |
| 25 | struct da9052_tsi { |
| 26 | struct da9052 *da9052; |
| 27 | struct input_dev *dev; |
| 28 | struct delayed_work ts_pen_work; |
| 29 | struct mutex mutex; |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 30 | bool stopped; |
| 31 | bool adc_on; |
| 32 | }; |
| 33 | |
| 34 | static void da9052_ts_adc_toggle(struct da9052_tsi *tsi, bool on) |
| 35 | { |
| 36 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0, on); |
| 37 | tsi->adc_on = on; |
| 38 | } |
| 39 | |
| 40 | static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data) |
| 41 | { |
| 42 | struct da9052_tsi *tsi = data; |
| 43 | |
| 44 | if (!tsi->stopped) { |
| 45 | /* Mask PEN_DOWN event and unmask TSI_READY event */ |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 46 | da9052_disable_irq_nosync(tsi->da9052, DA9052_IRQ_PENDOWN); |
| 47 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 48 | |
| 49 | da9052_ts_adc_toggle(tsi, true); |
| 50 | |
| 51 | schedule_delayed_work(&tsi->ts_pen_work, HZ / 50); |
| 52 | } |
| 53 | |
| 54 | return IRQ_HANDLED; |
| 55 | } |
| 56 | |
| 57 | static void da9052_ts_read(struct da9052_tsi *tsi) |
| 58 | { |
| 59 | struct input_dev *input = tsi->dev; |
| 60 | int ret; |
| 61 | u16 x, y, z; |
| 62 | u8 v; |
| 63 | |
| 64 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_X_MSB_REG); |
| 65 | if (ret < 0) |
| 66 | return; |
| 67 | |
| 68 | x = (u16) ret; |
| 69 | |
| 70 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Y_MSB_REG); |
| 71 | if (ret < 0) |
| 72 | return; |
| 73 | |
| 74 | y = (u16) ret; |
| 75 | |
| 76 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Z_MSB_REG); |
| 77 | if (ret < 0) |
| 78 | return; |
| 79 | |
| 80 | z = (u16) ret; |
| 81 | |
| 82 | ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG); |
| 83 | if (ret < 0) |
| 84 | return; |
| 85 | |
| 86 | v = (u8) ret; |
| 87 | |
| 88 | x = ((x << 2) & 0x3fc) | (v & 0x3); |
| 89 | y = ((y << 2) & 0x3fc) | ((v & 0xc) >> 2); |
| 90 | z = ((z << 2) & 0x3fc) | ((v & 0x30) >> 4); |
| 91 | |
| 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); |
| 96 | input_sync(input); |
| 97 | } |
| 98 | |
| 99 | static irqreturn_t da9052_ts_datardy_irq(int irq, void *data) |
| 100 | { |
| 101 | struct da9052_tsi *tsi = data; |
| 102 | |
| 103 | da9052_ts_read(tsi); |
| 104 | |
| 105 | return IRQ_HANDLED; |
| 106 | } |
| 107 | |
| 108 | static void da9052_ts_pen_work(struct work_struct *work) |
| 109 | { |
| 110 | struct da9052_tsi *tsi = container_of(work, struct da9052_tsi, |
| 111 | ts_pen_work.work); |
| 112 | if (!tsi->stopped) { |
| 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); |
| 117 | } else { |
| 118 | struct input_dev *input = tsi->dev; |
| 119 | |
| 120 | /* Pen UP */ |
| 121 | da9052_ts_adc_toggle(tsi, false); |
| 122 | |
| 123 | /* Report Pen UP */ |
| 124 | input_report_key(input, BTN_TOUCH, 0); |
| 125 | input_report_abs(input, ABS_PRESSURE, 0); |
| 126 | input_sync(input); |
| 127 | |
| 128 | /* |
| 129 | * FIXME: Fixes the unhandled irq issue when quick |
| 130 | * pen down and pen up events occurs |
| 131 | */ |
| 132 | ret = da9052_reg_update(tsi->da9052, |
| 133 | DA9052_EVENT_B_REG, 0xC0, 0xC0); |
| 134 | if (ret < 0) |
| 135 | return; |
| 136 | |
| 137 | /* Mask TSI_READY event and unmask PEN_DOWN event */ |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 138 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); |
| 139 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 140 | } |
| 141 | } |
| 142 | } |
| 143 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 144 | static int da9052_ts_configure_gpio(struct da9052 *da9052) |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 145 | { |
| 146 | int error; |
| 147 | |
| 148 | error = da9052_reg_update(da9052, DA9052_GPIO_2_3_REG, 0x30, 0); |
| 149 | if (error < 0) |
| 150 | return error; |
| 151 | |
| 152 | error = da9052_reg_update(da9052, DA9052_GPIO_4_5_REG, 0x33, 0); |
| 153 | if (error < 0) |
| 154 | return error; |
| 155 | |
| 156 | error = da9052_reg_update(da9052, DA9052_GPIO_6_7_REG, 0x33, 0); |
| 157 | if (error < 0) |
| 158 | return error; |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 163 | static int da9052_configure_tsi(struct da9052_tsi *tsi) |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 164 | { |
| 165 | int error; |
| 166 | |
| 167 | error = da9052_ts_configure_gpio(tsi->da9052); |
| 168 | if (error) |
| 169 | return error; |
| 170 | |
| 171 | /* Measure TSI sample every 1ms */ |
| 172 | error = da9052_reg_update(tsi->da9052, DA9052_ADC_CONT_REG, |
| 173 | 1 << 6, 1 << 6); |
| 174 | if (error < 0) |
| 175 | return error; |
| 176 | |
| 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); |
| 179 | if (error < 0) |
| 180 | return error; |
| 181 | |
| 182 | /* Supply TSIRef through LD09 */ |
| 183 | error = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59); |
| 184 | if (error < 0) |
| 185 | return error; |
| 186 | |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | static int da9052_ts_input_open(struct input_dev *input_dev) |
| 191 | { |
| 192 | struct da9052_tsi *tsi = input_get_drvdata(input_dev); |
| 193 | |
| 194 | tsi->stopped = false; |
| 195 | mb(); |
| 196 | |
| 197 | /* Unmask PEN_DOWN event */ |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 198 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 199 | |
| 200 | /* Enable Pen Detect Circuit */ |
| 201 | return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, |
| 202 | 1 << 1, 1 << 1); |
| 203 | } |
| 204 | |
| 205 | static void da9052_ts_input_close(struct input_dev *input_dev) |
| 206 | { |
| 207 | struct da9052_tsi *tsi = input_get_drvdata(input_dev); |
| 208 | |
| 209 | tsi->stopped = true; |
| 210 | mb(); |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 211 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 212 | cancel_delayed_work_sync(&tsi->ts_pen_work); |
| 213 | |
| 214 | if (tsi->adc_on) { |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 215 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 216 | da9052_ts_adc_toggle(tsi, false); |
| 217 | |
| 218 | /* |
| 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. |
| 222 | */ |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 223 | da9052_enable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 224 | } |
| 225 | |
| 226 | /* Disable Pen Detect Circuit */ |
| 227 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0); |
| 228 | } |
| 229 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 230 | static int da9052_ts_probe(struct platform_device *pdev) |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 231 | { |
| 232 | struct da9052 *da9052; |
| 233 | struct da9052_tsi *tsi; |
| 234 | struct input_dev *input_dev; |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 235 | int error; |
| 236 | |
| 237 | da9052 = dev_get_drvdata(pdev->dev.parent); |
| 238 | if (!da9052) |
| 239 | return -EINVAL; |
| 240 | |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 241 | tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL); |
| 242 | input_dev = input_allocate_device(); |
| 243 | if (!tsi || !input_dev) { |
| 244 | error = -ENOMEM; |
| 245 | goto err_free_mem; |
| 246 | } |
| 247 | |
| 248 | tsi->da9052 = da9052; |
| 249 | tsi->dev = input_dev; |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 250 | tsi->stopped = true; |
| 251 | INIT_DELAYED_WORK(&tsi->ts_pen_work, da9052_ts_pen_work); |
| 252 | |
| 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; |
| 260 | |
| 261 | __set_bit(EV_ABS, input_dev->evbit); |
| 262 | __set_bit(EV_KEY, input_dev->evbit); |
| 263 | __set_bit(BTN_TOUCH, input_dev->keybit); |
| 264 | |
| 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); |
| 268 | |
| 269 | input_set_drvdata(input_dev, tsi); |
| 270 | |
| 271 | /* Disable Pen Detect Circuit */ |
| 272 | da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0); |
| 273 | |
| 274 | /* Disable ADC */ |
| 275 | da9052_ts_adc_toggle(tsi, false); |
| 276 | |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 277 | error = da9052_request_irq(tsi->da9052, DA9052_IRQ_PENDOWN, |
| 278 | "pendown-irq", da9052_ts_pendwn_irq, tsi); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 279 | if (error) { |
| 280 | dev_err(tsi->da9052->dev, |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 281 | "Failed to register PENDWN IRQ: %d\n", error); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 282 | goto err_free_mem; |
| 283 | } |
| 284 | |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 285 | error = da9052_request_irq(tsi->da9052, DA9052_IRQ_TSIREADY, |
| 286 | "tsiready-irq", da9052_ts_datardy_irq, tsi); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 287 | if (error) { |
| 288 | dev_err(tsi->da9052->dev, |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 289 | "Failed to register TSIRDY IRQ :%d\n", error); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 290 | goto err_free_pendwn_irq; |
| 291 | } |
| 292 | |
| 293 | /* Mask PEN_DOWN and TSI_READY events */ |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 294 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_PENDOWN); |
| 295 | da9052_disable_irq(tsi->da9052, DA9052_IRQ_TSIREADY); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 296 | |
| 297 | error = da9052_configure_tsi(tsi); |
| 298 | if (error) |
| 299 | goto err_free_datardy_irq; |
| 300 | |
| 301 | error = input_register_device(tsi->dev); |
| 302 | if (error) |
| 303 | goto err_free_datardy_irq; |
| 304 | |
| 305 | platform_set_drvdata(pdev, tsi); |
| 306 | |
| 307 | return 0; |
| 308 | |
| 309 | err_free_datardy_irq: |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 310 | da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 311 | err_free_pendwn_irq: |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 312 | da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 313 | err_free_mem: |
| 314 | kfree(tsi); |
| 315 | input_free_device(input_dev); |
| 316 | |
| 317 | return error; |
| 318 | } |
| 319 | |
Bill Pemberton | e2619cf | 2012-11-23 21:50:47 -0800 | [diff] [blame] | 320 | static int da9052_ts_remove(struct platform_device *pdev) |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 321 | { |
| 322 | struct da9052_tsi *tsi = platform_get_drvdata(pdev); |
| 323 | |
| 324 | da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19); |
| 325 | |
Fabio Estevam | 8f52080 | 2012-10-04 01:21:30 -0300 | [diff] [blame] | 326 | da9052_free_irq(tsi->da9052, DA9052_IRQ_TSIREADY, tsi); |
| 327 | da9052_free_irq(tsi->da9052, DA9052_IRQ_PENDOWN, tsi); |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 328 | |
| 329 | input_unregister_device(tsi->dev); |
| 330 | kfree(tsi); |
| 331 | |
| 332 | platform_set_drvdata(pdev, NULL); |
| 333 | |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | static struct platform_driver da9052_tsi_driver = { |
| 338 | .probe = da9052_ts_probe, |
Bill Pemberton | 1cb0aa8 | 2012-11-23 21:27:39 -0800 | [diff] [blame] | 339 | .remove = da9052_ts_remove, |
Ashish Jangam | eead75a | 2012-04-29 23:33:41 -0700 | [diff] [blame] | 340 | .driver = { |
| 341 | .name = "da9052-tsi", |
| 342 | .owner = THIS_MODULE, |
| 343 | }, |
| 344 | }; |
| 345 | |
| 346 | module_platform_driver(da9052_tsi_driver); |
| 347 | |
| 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"); |