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0006 #include <linux/module.h>
0007 #include <linux/init.h>
0008 #include <linux/input.h>
0009 #include <linux/delay.h>
0010 #include <linux/interrupt.h>
0011 #include <linux/keyboard.h>
0012 #include <linux/platform_device.h>
0013 #include <linux/slab.h>
0014 #include <linux/of.h>
0015 #include <asm/irq.h>
0016 #include <linux/io.h>
0017 #include <linux/clk.h>
0018 #include <linux/serio.h>
0019 #include <linux/mfd/syscon.h>
0020 #include <linux/regmap.h>
0021
0022 #define IPROC_TS_NAME "iproc-ts"
0023
0024 #define PEN_DOWN_STATUS 1
0025 #define PEN_UP_STATUS 0
0026
0027 #define X_MIN 0
0028 #define Y_MIN 0
0029 #define X_MAX 0xFFF
0030 #define Y_MAX 0xFFF
0031
0032
0033 #define INVALID_COORD 0xFFFFFFFF
0034
0035
0036 #define REGCTL1 0x00
0037 #define REGCTL2 0x04
0038 #define INTERRUPT_THRES 0x08
0039 #define INTERRUPT_MASK 0x0c
0040
0041 #define INTERRUPT_STATUS 0x10
0042 #define CONTROLLER_STATUS 0x14
0043 #define FIFO_DATA 0x18
0044 #define FIFO_DATA_X_Y_MASK 0xFFFF
0045 #define ANALOG_CONTROL 0x1c
0046
0047 #define AUX_DATA 0x20
0048 #define DEBOUNCE_CNTR_STAT 0x24
0049 #define SCAN_CNTR_STAT 0x28
0050 #define REM_CNTR_STAT 0x2c
0051
0052 #define SETTLING_TIMER_STAT 0x30
0053 #define SPARE_REG 0x34
0054 #define SOFT_BYPASS_CONTROL 0x38
0055 #define SOFT_BYPASS_DATA 0x3c
0056
0057
0058
0059 #define TS_PEN_INTR_MASK BIT(0)
0060 #define TS_FIFO_INTR_MASK BIT(2)
0061
0062
0063 #define TS_PEN_DOWN BIT(0)
0064
0065
0066 #define SCANNING_PERIOD_SHIFT 24
0067 #define DEBOUNCE_TIMEOUT_SHIFT 16
0068 #define SETTLING_TIMEOUT_SHIFT 8
0069 #define TOUCH_TIMEOUT_SHIFT 0
0070
0071
0072 #define X_COORD_SHIFT 0
0073 #define Y_COORD_SHIFT 16
0074
0075
0076 #define TS_CONTROLLER_EN_BIT BIT(16)
0077 #define TS_CONTROLLER_AVGDATA_SHIFT 8
0078 #define TS_CONTROLLER_AVGDATA_MASK (0x7 << TS_CONTROLLER_AVGDATA_SHIFT)
0079 #define TS_CONTROLLER_PWR_LDO BIT(5)
0080 #define TS_CONTROLLER_PWR_ADC BIT(4)
0081 #define TS_CONTROLLER_PWR_BGP BIT(3)
0082 #define TS_CONTROLLER_PWR_TS BIT(2)
0083 #define TS_WIRE_MODE_BIT BIT(1)
0084
0085 #define dbg_reg(dev, priv, reg) \
0086 do { \
0087 u32 val; \
0088 regmap_read(priv->regmap, reg, &val); \
0089 dev_dbg(dev, "%20s= 0x%08x\n", #reg, val); \
0090 } while (0)
0091
0092 struct tsc_param {
0093
0094 u32 scanning_period;
0095
0096
0097 u32 debounce_timeout;
0098
0099
0100
0101
0102
0103
0104
0105
0106
0107
0108
0109
0110
0111
0112
0113
0114
0115
0116 u32 settling_timeout;
0117
0118
0119 u32 touch_timeout;
0120
0121
0122
0123
0124
0125 u32 average_data;
0126
0127
0128 u32 fifo_threshold;
0129
0130
0131 u32 max_x;
0132 u32 max_y;
0133 u32 fuzz_x;
0134 u32 fuzz_y;
0135 bool invert_x;
0136 bool invert_y;
0137 };
0138
0139 struct iproc_ts_priv {
0140 struct platform_device *pdev;
0141 struct input_dev *idev;
0142
0143 struct regmap *regmap;
0144 struct clk *tsc_clk;
0145
0146 int pen_status;
0147 struct tsc_param cfg_params;
0148 };
0149
0150
0151
0152
0153
0154 static const struct tsc_param iproc_default_config = {
0155 .scanning_period = 0x5,
0156 .debounce_timeout = 0x28,
0157 .settling_timeout = 0x7,
0158 .touch_timeout = 0xa,
0159 .average_data = 5,
0160 .fifo_threshold = 1,
0161 .max_x = X_MAX,
0162 .max_y = Y_MAX,
0163 };
0164
0165 static void ts_reg_dump(struct iproc_ts_priv *priv)
0166 {
0167 struct device *dev = &priv->pdev->dev;
0168
0169 dbg_reg(dev, priv, REGCTL1);
0170 dbg_reg(dev, priv, REGCTL2);
0171 dbg_reg(dev, priv, INTERRUPT_THRES);
0172 dbg_reg(dev, priv, INTERRUPT_MASK);
0173 dbg_reg(dev, priv, INTERRUPT_STATUS);
0174 dbg_reg(dev, priv, CONTROLLER_STATUS);
0175 dbg_reg(dev, priv, FIFO_DATA);
0176 dbg_reg(dev, priv, ANALOG_CONTROL);
0177 dbg_reg(dev, priv, AUX_DATA);
0178 dbg_reg(dev, priv, DEBOUNCE_CNTR_STAT);
0179 dbg_reg(dev, priv, SCAN_CNTR_STAT);
0180 dbg_reg(dev, priv, REM_CNTR_STAT);
0181 dbg_reg(dev, priv, SETTLING_TIMER_STAT);
0182 dbg_reg(dev, priv, SPARE_REG);
0183 dbg_reg(dev, priv, SOFT_BYPASS_CONTROL);
0184 dbg_reg(dev, priv, SOFT_BYPASS_DATA);
0185 }
0186
0187 static irqreturn_t iproc_touchscreen_interrupt(int irq, void *data)
0188 {
0189 struct platform_device *pdev = data;
0190 struct iproc_ts_priv *priv = platform_get_drvdata(pdev);
0191 u32 intr_status;
0192 u32 raw_coordinate;
0193 u16 x;
0194 u16 y;
0195 int i;
0196 bool needs_sync = false;
0197
0198 regmap_read(priv->regmap, INTERRUPT_STATUS, &intr_status);
0199 intr_status &= TS_PEN_INTR_MASK | TS_FIFO_INTR_MASK;
0200 if (intr_status == 0)
0201 return IRQ_NONE;
0202
0203
0204 regmap_write(priv->regmap, INTERRUPT_STATUS, intr_status);
0205
0206 if (intr_status & TS_PEN_INTR_MASK) {
0207 regmap_read(priv->regmap, CONTROLLER_STATUS, &priv->pen_status);
0208 if (priv->pen_status & TS_PEN_DOWN)
0209 priv->pen_status = PEN_DOWN_STATUS;
0210 else
0211 priv->pen_status = PEN_UP_STATUS;
0212
0213 input_report_key(priv->idev, BTN_TOUCH, priv->pen_status);
0214 needs_sync = true;
0215
0216 dev_dbg(&priv->pdev->dev,
0217 "pen up-down (%d)\n", priv->pen_status);
0218 }
0219
0220
0221 if (intr_status & TS_FIFO_INTR_MASK) {
0222 for (i = 0; i < priv->cfg_params.fifo_threshold; i++) {
0223 regmap_read(priv->regmap, FIFO_DATA, &raw_coordinate);
0224 if (raw_coordinate == INVALID_COORD)
0225 continue;
0226
0227
0228
0229
0230
0231
0232 x = (raw_coordinate >> X_COORD_SHIFT) &
0233 FIFO_DATA_X_Y_MASK;
0234 y = (raw_coordinate >> Y_COORD_SHIFT) &
0235 FIFO_DATA_X_Y_MASK;
0236
0237
0238 x = (x >> 4) & 0x0FFF;
0239 y = (y >> 4) & 0x0FFF;
0240
0241
0242 if (priv->cfg_params.invert_x)
0243 x = priv->cfg_params.max_x - x;
0244
0245 if (priv->cfg_params.invert_y)
0246 y = priv->cfg_params.max_y - y;
0247
0248 input_report_abs(priv->idev, ABS_X, x);
0249 input_report_abs(priv->idev, ABS_Y, y);
0250 needs_sync = true;
0251
0252 dev_dbg(&priv->pdev->dev, "xy (0x%x 0x%x)\n", x, y);
0253 }
0254 }
0255
0256 if (needs_sync)
0257 input_sync(priv->idev);
0258
0259 return IRQ_HANDLED;
0260 }
0261
0262 static int iproc_ts_start(struct input_dev *idev)
0263 {
0264 u32 val;
0265 u32 mask;
0266 int error;
0267 struct iproc_ts_priv *priv = input_get_drvdata(idev);
0268
0269
0270 error = clk_prepare_enable(priv->tsc_clk);
0271 if (error) {
0272 dev_err(&priv->pdev->dev, "%s clk_prepare_enable failed %d\n",
0273 __func__, error);
0274 return error;
0275 }
0276
0277
0278
0279
0280
0281 val = TS_PEN_INTR_MASK | TS_FIFO_INTR_MASK;
0282 regmap_update_bits(priv->regmap, INTERRUPT_MASK, val, val);
0283
0284 val = priv->cfg_params.fifo_threshold;
0285 regmap_write(priv->regmap, INTERRUPT_THRES, val);
0286
0287
0288 val = 0;
0289 val |= priv->cfg_params.scanning_period << SCANNING_PERIOD_SHIFT;
0290 val |= priv->cfg_params.debounce_timeout << DEBOUNCE_TIMEOUT_SHIFT;
0291 val |= priv->cfg_params.settling_timeout << SETTLING_TIMEOUT_SHIFT;
0292 val |= priv->cfg_params.touch_timeout << TOUCH_TIMEOUT_SHIFT;
0293 regmap_write(priv->regmap, REGCTL1, val);
0294
0295
0296 val = TS_FIFO_INTR_MASK | TS_PEN_INTR_MASK;
0297 regmap_update_bits(priv->regmap, INTERRUPT_STATUS, val, val);
0298
0299
0300 val = TS_CONTROLLER_EN_BIT | TS_WIRE_MODE_BIT;
0301 val |= priv->cfg_params.average_data << TS_CONTROLLER_AVGDATA_SHIFT;
0302
0303 mask = (TS_CONTROLLER_AVGDATA_MASK);
0304 mask |= (TS_CONTROLLER_PWR_LDO |
0305 TS_CONTROLLER_PWR_ADC |
0306 TS_CONTROLLER_PWR_BGP |
0307 TS_CONTROLLER_PWR_TS);
0308 mask |= val;
0309 regmap_update_bits(priv->regmap, REGCTL2, mask, val);
0310
0311 ts_reg_dump(priv);
0312
0313 return 0;
0314 }
0315
0316 static void iproc_ts_stop(struct input_dev *dev)
0317 {
0318 u32 val;
0319 struct iproc_ts_priv *priv = input_get_drvdata(dev);
0320
0321
0322
0323
0324
0325
0326 val = TS_PEN_INTR_MASK | TS_FIFO_INTR_MASK;
0327 regmap_update_bits(priv->regmap, INTERRUPT_MASK, val, 0);
0328
0329
0330 val = TS_CONTROLLER_PWR_TS;
0331 regmap_update_bits(priv->regmap, REGCTL2, val, val);
0332
0333 clk_disable(priv->tsc_clk);
0334 }
0335
0336 static int iproc_get_tsc_config(struct device *dev, struct iproc_ts_priv *priv)
0337 {
0338 struct device_node *np = dev->of_node;
0339 u32 val;
0340
0341 priv->cfg_params = iproc_default_config;
0342
0343 if (!np)
0344 return 0;
0345
0346 if (of_property_read_u32(np, "scanning_period", &val) >= 0) {
0347 if (val < 1 || val > 256) {
0348 dev_err(dev, "scanning_period (%u) must be [1-256]\n",
0349 val);
0350 return -EINVAL;
0351 }
0352 priv->cfg_params.scanning_period = val;
0353 }
0354
0355 if (of_property_read_u32(np, "debounce_timeout", &val) >= 0) {
0356 if (val > 255) {
0357 dev_err(dev, "debounce_timeout (%u) must be [0-255]\n",
0358 val);
0359 return -EINVAL;
0360 }
0361 priv->cfg_params.debounce_timeout = val;
0362 }
0363
0364 if (of_property_read_u32(np, "settling_timeout", &val) >= 0) {
0365 if (val > 11) {
0366 dev_err(dev, "settling_timeout (%u) must be [0-11]\n",
0367 val);
0368 return -EINVAL;
0369 }
0370 priv->cfg_params.settling_timeout = val;
0371 }
0372
0373 if (of_property_read_u32(np, "touch_timeout", &val) >= 0) {
0374 if (val > 255) {
0375 dev_err(dev, "touch_timeout (%u) must be [0-255]\n",
0376 val);
0377 return -EINVAL;
0378 }
0379 priv->cfg_params.touch_timeout = val;
0380 }
0381
0382 if (of_property_read_u32(np, "average_data", &val) >= 0) {
0383 if (val > 8) {
0384 dev_err(dev, "average_data (%u) must be [0-8]\n", val);
0385 return -EINVAL;
0386 }
0387 priv->cfg_params.average_data = val;
0388 }
0389
0390 if (of_property_read_u32(np, "fifo_threshold", &val) >= 0) {
0391 if (val > 31) {
0392 dev_err(dev, "fifo_threshold (%u)) must be [0-31]\n",
0393 val);
0394 return -EINVAL;
0395 }
0396 priv->cfg_params.fifo_threshold = val;
0397 }
0398
0399
0400 of_property_read_u32(np, "touchscreen-size-x", &priv->cfg_params.max_x);
0401 of_property_read_u32(np, "touchscreen-size-y", &priv->cfg_params.max_y);
0402
0403 of_property_read_u32(np, "touchscreen-fuzz-x",
0404 &priv->cfg_params.fuzz_x);
0405 of_property_read_u32(np, "touchscreen-fuzz-y",
0406 &priv->cfg_params.fuzz_y);
0407
0408 priv->cfg_params.invert_x =
0409 of_property_read_bool(np, "touchscreen-inverted-x");
0410 priv->cfg_params.invert_y =
0411 of_property_read_bool(np, "touchscreen-inverted-y");
0412
0413 return 0;
0414 }
0415
0416 static int iproc_ts_probe(struct platform_device *pdev)
0417 {
0418 struct iproc_ts_priv *priv;
0419 struct input_dev *idev;
0420 int irq;
0421 int error;
0422
0423 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
0424 if (!priv)
0425 return -ENOMEM;
0426
0427
0428 priv->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
0429 "ts_syscon");
0430 if (IS_ERR(priv->regmap)) {
0431 error = PTR_ERR(priv->regmap);
0432 dev_err(&pdev->dev, "unable to map I/O memory:%d\n", error);
0433 return error;
0434 }
0435
0436 priv->tsc_clk = devm_clk_get(&pdev->dev, "tsc_clk");
0437 if (IS_ERR(priv->tsc_clk)) {
0438 error = PTR_ERR(priv->tsc_clk);
0439 dev_err(&pdev->dev,
0440 "failed getting clock tsc_clk: %d\n", error);
0441 return error;
0442 }
0443
0444 priv->pdev = pdev;
0445 error = iproc_get_tsc_config(&pdev->dev, priv);
0446 if (error) {
0447 dev_err(&pdev->dev, "get_tsc_config failed: %d\n", error);
0448 return error;
0449 }
0450
0451 idev = devm_input_allocate_device(&pdev->dev);
0452 if (!idev) {
0453 dev_err(&pdev->dev, "failed to allocate input device\n");
0454 return -ENOMEM;
0455 }
0456
0457 priv->idev = idev;
0458 priv->pen_status = PEN_UP_STATUS;
0459
0460
0461 idev->name = IPROC_TS_NAME;
0462 idev->dev.parent = &pdev->dev;
0463
0464 idev->id.bustype = BUS_HOST;
0465 idev->id.vendor = SERIO_UNKNOWN;
0466 idev->id.product = 0;
0467 idev->id.version = 0;
0468
0469 idev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
0470 __set_bit(BTN_TOUCH, idev->keybit);
0471
0472 input_set_abs_params(idev, ABS_X, X_MIN, priv->cfg_params.max_x,
0473 priv->cfg_params.fuzz_x, 0);
0474 input_set_abs_params(idev, ABS_Y, Y_MIN, priv->cfg_params.max_y,
0475 priv->cfg_params.fuzz_y, 0);
0476
0477 idev->open = iproc_ts_start;
0478 idev->close = iproc_ts_stop;
0479
0480 input_set_drvdata(idev, priv);
0481 platform_set_drvdata(pdev, priv);
0482
0483
0484 irq = platform_get_irq(pdev, 0);
0485 if (irq < 0)
0486 return irq;
0487
0488 error = devm_request_irq(&pdev->dev, irq,
0489 iproc_touchscreen_interrupt,
0490 IRQF_SHARED, IPROC_TS_NAME, pdev);
0491 if (error)
0492 return error;
0493
0494 error = input_register_device(priv->idev);
0495 if (error) {
0496 dev_err(&pdev->dev,
0497 "failed to register input device: %d\n", error);
0498 return error;
0499 }
0500
0501 return 0;
0502 }
0503
0504 static const struct of_device_id iproc_ts_of_match[] = {
0505 {.compatible = "brcm,iproc-touchscreen", },
0506 { },
0507 };
0508 MODULE_DEVICE_TABLE(of, iproc_ts_of_match);
0509
0510 static struct platform_driver iproc_ts_driver = {
0511 .probe = iproc_ts_probe,
0512 .driver = {
0513 .name = IPROC_TS_NAME,
0514 .of_match_table = of_match_ptr(iproc_ts_of_match),
0515 },
0516 };
0517
0518 module_platform_driver(iproc_ts_driver);
0519
0520 MODULE_DESCRIPTION("IPROC Touchscreen driver");
0521 MODULE_AUTHOR("Broadcom");
0522 MODULE_LICENSE("GPL v2");