1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Touchscreen driver for Marvell 88PM860x 4 * 5 * Copyright (C) 2009 Marvell International Ltd. 6 * Haojian Zhuang <haojian.zhuang@marvell.com> 7 */ 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/of.h> 11 #include <linux/platform_device.h> 12 #include <linux/i2c.h> 13 #include <linux/input.h> 14 #include <linux/mfd/88pm860x.h> 15 #include <linux/slab.h> 16 #include <linux/device.h> 17 18 #define MEAS_LEN (8) 19 #define ACCURATE_BIT (12) 20 21 /* touch register */ 22 #define MEAS_EN3 (0x52) 23 24 #define MEAS_TSIX_1 (0x8D) 25 #define MEAS_TSIX_2 (0x8E) 26 #define MEAS_TSIY_1 (0x8F) 27 #define MEAS_TSIY_2 (0x90) 28 #define MEAS_TSIZ1_1 (0x91) 29 #define MEAS_TSIZ1_2 (0x92) 30 #define MEAS_TSIZ2_1 (0x93) 31 #define MEAS_TSIZ2_2 (0x94) 32 33 /* bit definitions of touch */ 34 #define MEAS_PD_EN (1 << 3) 35 #define MEAS_TSIX_EN (1 << 4) 36 #define MEAS_TSIY_EN (1 << 5) 37 #define MEAS_TSIZ1_EN (1 << 6) 38 #define MEAS_TSIZ2_EN (1 << 7) 39 40 struct pm860x_touch { 41 struct input_dev *idev; 42 struct i2c_client *i2c; 43 struct pm860x_chip *chip; 44 int irq; 45 int res_x; /* resistor of Xplate */ 46 }; 47 48 static irqreturn_t pm860x_touch_handler(int irq, void *data) 49 { 50 struct pm860x_touch *touch = data; 51 struct pm860x_chip *chip = touch->chip; 52 unsigned char buf[MEAS_LEN]; 53 int x, y, pen_down; 54 int z1, z2, rt = 0; 55 int ret; 56 57 ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf); 58 if (ret < 0) 59 goto out; 60 61 pen_down = buf[1] & (1 << 6); 62 x = ((buf[0] & 0xFF) << 4) | (buf[1] & 0x0F); 63 y = ((buf[2] & 0xFF) << 4) | (buf[3] & 0x0F); 64 z1 = ((buf[4] & 0xFF) << 4) | (buf[5] & 0x0F); 65 z2 = ((buf[6] & 0xFF) << 4) | (buf[7] & 0x0F); 66 67 if (pen_down) { 68 if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) { 69 rt = z2 / z1 - 1; 70 rt = (rt * touch->res_x * x) >> ACCURATE_BIT; 71 dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n", 72 z1, z2, rt); 73 } 74 input_report_abs(touch->idev, ABS_X, x); 75 input_report_abs(touch->idev, ABS_Y, y); 76 input_report_abs(touch->idev, ABS_PRESSURE, rt); 77 input_report_key(touch->idev, BTN_TOUCH, 1); 78 dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y); 79 } else { 80 input_report_abs(touch->idev, ABS_PRESSURE, 0); 81 input_report_key(touch->idev, BTN_TOUCH, 0); 82 dev_dbg(chip->dev, "pen release\n"); 83 } 84 input_sync(touch->idev); 85 86 out: 87 return IRQ_HANDLED; 88 } 89 90 static int pm860x_touch_open(struct input_dev *dev) 91 { 92 struct pm860x_touch *touch = input_get_drvdata(dev); 93 int data, ret; 94 95 data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN 96 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN; 97 ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data); 98 if (ret < 0) 99 goto out; 100 return 0; 101 out: 102 return ret; 103 } 104 105 static void pm860x_touch_close(struct input_dev *dev) 106 { 107 struct pm860x_touch *touch = input_get_drvdata(dev); 108 int data; 109 110 data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN 111 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN; 112 pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0); 113 } 114 115 #ifdef CONFIG_OF 116 static int pm860x_touch_dt_init(struct platform_device *pdev, 117 struct pm860x_chip *chip, 118 int *res_x) 119 { 120 struct device_node *np = pdev->dev.parent->of_node; 121 struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \ 122 : chip->companion; 123 int data, n, ret; 124 if (!np) 125 return -ENODEV; 126 np = of_get_child_by_name(np, "touch"); 127 if (!np) { 128 dev_err(&pdev->dev, "Can't find touch node\n"); 129 return -EINVAL; 130 } 131 /* set GPADC MISC1 register */ 132 data = 0; 133 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-prebias", &n)) 134 data |= (n << 1) & PM8607_GPADC_PREBIAS_MASK; 135 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-slot-cycle", &n)) 136 data |= (n << 3) & PM8607_GPADC_SLOT_CYCLE_MASK; 137 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-off-scale", &n)) 138 data |= (n << 5) & PM8607_GPADC_OFF_SCALE_MASK; 139 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-sw-cal", &n)) 140 data |= (n << 7) & PM8607_GPADC_SW_CAL_MASK; 141 if (data) { 142 ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data); 143 if (ret < 0) 144 goto err_put_node; 145 } 146 /* set tsi prebias time */ 147 if (!of_property_read_u32(np, "marvell,88pm860x-tsi-prebias", &data)) { 148 ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data); 149 if (ret < 0) 150 goto err_put_node; 151 } 152 /* set prebias & prechg time of pen detect */ 153 data = 0; 154 if (!of_property_read_u32(np, "marvell,88pm860x-pen-prebias", &n)) 155 data |= n & PM8607_PD_PREBIAS_MASK; 156 if (!of_property_read_u32(np, "marvell,88pm860x-pen-prechg", &n)) 157 data |= n & PM8607_PD_PRECHG_MASK; 158 if (data) { 159 ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data); 160 if (ret < 0) 161 goto err_put_node; 162 } 163 of_property_read_u32(np, "marvell,88pm860x-resistor-X", res_x); 164 165 of_node_put(np); 166 167 return 0; 168 169 err_put_node: 170 of_node_put(np); 171 172 return -EINVAL; 173 } 174 #else 175 #define pm860x_touch_dt_init(x, y, z) (-1) 176 #endif 177 178 static int pm860x_touch_probe(struct platform_device *pdev) 179 { 180 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 181 struct pm860x_touch_pdata *pdata = dev_get_platdata(&pdev->dev); 182 struct pm860x_touch *touch; 183 struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \ 184 : chip->companion; 185 int irq, ret, res_x = 0, data = 0; 186 187 irq = platform_get_irq(pdev, 0); 188 if (irq < 0) { 189 dev_err(&pdev->dev, "No IRQ resource!\n"); 190 return -EINVAL; 191 } 192 193 if (pm860x_touch_dt_init(pdev, chip, &res_x)) { 194 if (pdata) { 195 /* set GPADC MISC1 register */ 196 data = 0; 197 data |= (pdata->gpadc_prebias << 1) 198 & PM8607_GPADC_PREBIAS_MASK; 199 data |= (pdata->slot_cycle << 3) 200 & PM8607_GPADC_SLOT_CYCLE_MASK; 201 data |= (pdata->off_scale << 5) 202 & PM8607_GPADC_OFF_SCALE_MASK; 203 data |= (pdata->sw_cal << 7) 204 & PM8607_GPADC_SW_CAL_MASK; 205 if (data) { 206 ret = pm860x_reg_write(i2c, 207 PM8607_GPADC_MISC1, data); 208 if (ret < 0) 209 return -EINVAL; 210 } 211 /* set tsi prebias time */ 212 if (pdata->tsi_prebias) { 213 data = pdata->tsi_prebias; 214 ret = pm860x_reg_write(i2c, 215 PM8607_TSI_PREBIAS, data); 216 if (ret < 0) 217 return -EINVAL; 218 } 219 /* set prebias & prechg time of pen detect */ 220 data = 0; 221 data |= pdata->pen_prebias 222 & PM8607_PD_PREBIAS_MASK; 223 data |= (pdata->pen_prechg << 5) 224 & PM8607_PD_PRECHG_MASK; 225 if (data) { 226 ret = pm860x_reg_write(i2c, 227 PM8607_PD_PREBIAS, data); 228 if (ret < 0) 229 return -EINVAL; 230 } 231 res_x = pdata->res_x; 232 } else { 233 dev_err(&pdev->dev, "failed to get platform data\n"); 234 return -EINVAL; 235 } 236 } 237 /* enable GPADC */ 238 ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, PM8607_GPADC_EN, 239 PM8607_GPADC_EN); 240 if (ret) 241 return ret; 242 243 touch = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_touch), 244 GFP_KERNEL); 245 if (!touch) 246 return -ENOMEM; 247 248 touch->idev = devm_input_allocate_device(&pdev->dev); 249 if (!touch->idev) { 250 dev_err(&pdev->dev, "Failed to allocate input device!\n"); 251 return -ENOMEM; 252 } 253 254 touch->idev->name = "88pm860x-touch"; 255 touch->idev->phys = "88pm860x/input0"; 256 touch->idev->id.bustype = BUS_I2C; 257 touch->idev->dev.parent = &pdev->dev; 258 touch->idev->open = pm860x_touch_open; 259 touch->idev->close = pm860x_touch_close; 260 touch->chip = chip; 261 touch->i2c = i2c; 262 touch->irq = irq; 263 touch->res_x = res_x; 264 input_set_drvdata(touch->idev, touch); 265 266 ret = devm_request_threaded_irq(&pdev->dev, touch->irq, NULL, 267 pm860x_touch_handler, IRQF_ONESHOT, 268 "touch", touch); 269 if (ret < 0) 270 return ret; 271 272 __set_bit(EV_ABS, touch->idev->evbit); 273 __set_bit(ABS_X, touch->idev->absbit); 274 __set_bit(ABS_Y, touch->idev->absbit); 275 __set_bit(ABS_PRESSURE, touch->idev->absbit); 276 __set_bit(EV_SYN, touch->idev->evbit); 277 __set_bit(EV_KEY, touch->idev->evbit); 278 __set_bit(BTN_TOUCH, touch->idev->keybit); 279 280 input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0); 281 input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0); 282 input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT, 283 0, 0); 284 285 ret = input_register_device(touch->idev); 286 if (ret < 0) { 287 dev_err(chip->dev, "Failed to register touch!\n"); 288 return ret; 289 } 290 291 return 0; 292 } 293 294 static struct platform_driver pm860x_touch_driver = { 295 .driver = { 296 .name = "88pm860x-touch", 297 }, 298 .probe = pm860x_touch_probe, 299 }; 300 module_platform_driver(pm860x_touch_driver); 301 302 MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x"); 303 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 304 MODULE_LICENSE("GPL"); 305 MODULE_ALIAS("platform:88pm860x-touch"); 306 307