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 i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \ 121 : chip->companion; 122 int data, n, ret; 123 if (!pdev->dev.parent->of_node) 124 return -ENODEV; 125 126 struct device_node *np __free(device_node) = 127 of_get_child_by_name(pdev->dev.parent->of_node, "touch"); 128 if (!np) { 129 dev_err(&pdev->dev, "Can't find touch node\n"); 130 return -EINVAL; 131 } 132 /* set GPADC MISC1 register */ 133 data = 0; 134 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-prebias", &n)) 135 data |= (n << 1) & PM8607_GPADC_PREBIAS_MASK; 136 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-slot-cycle", &n)) 137 data |= (n << 3) & PM8607_GPADC_SLOT_CYCLE_MASK; 138 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-off-scale", &n)) 139 data |= (n << 5) & PM8607_GPADC_OFF_SCALE_MASK; 140 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-sw-cal", &n)) 141 data |= (n << 7) & PM8607_GPADC_SW_CAL_MASK; 142 if (data) { 143 ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data); 144 if (ret < 0) 145 return -EINVAL; 146 } 147 /* set tsi prebias time */ 148 if (!of_property_read_u32(np, "marvell,88pm860x-tsi-prebias", &data)) { 149 ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data); 150 if (ret < 0) 151 return -EINVAL; 152 } 153 /* set prebias & prechg time of pen detect */ 154 data = 0; 155 if (!of_property_read_u32(np, "marvell,88pm860x-pen-prebias", &n)) 156 data |= n & PM8607_PD_PREBIAS_MASK; 157 if (!of_property_read_u32(np, "marvell,88pm860x-pen-prechg", &n)) 158 data |= n & PM8607_PD_PRECHG_MASK; 159 if (data) { 160 ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data); 161 if (ret < 0) 162 return -EINVAL; 163 } 164 of_property_read_u32(np, "marvell,88pm860x-resistor-X", res_x); 165 166 return 0; 167 } 168 #else 169 #define pm860x_touch_dt_init(x, y, z) (-1) 170 #endif 171 172 static int pm860x_touch_probe(struct platform_device *pdev) 173 { 174 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 175 struct pm860x_touch_pdata *pdata = dev_get_platdata(&pdev->dev); 176 struct pm860x_touch *touch; 177 struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \ 178 : chip->companion; 179 int irq, ret, res_x = 0, data = 0; 180 181 irq = platform_get_irq(pdev, 0); 182 if (irq < 0) 183 return -EINVAL; 184 185 if (pm860x_touch_dt_init(pdev, chip, &res_x)) { 186 if (pdata) { 187 /* set GPADC MISC1 register */ 188 data = 0; 189 data |= (pdata->gpadc_prebias << 1) 190 & PM8607_GPADC_PREBIAS_MASK; 191 data |= (pdata->slot_cycle << 3) 192 & PM8607_GPADC_SLOT_CYCLE_MASK; 193 data |= (pdata->off_scale << 5) 194 & PM8607_GPADC_OFF_SCALE_MASK; 195 data |= (pdata->sw_cal << 7) 196 & PM8607_GPADC_SW_CAL_MASK; 197 if (data) { 198 ret = pm860x_reg_write(i2c, 199 PM8607_GPADC_MISC1, data); 200 if (ret < 0) 201 return -EINVAL; 202 } 203 /* set tsi prebias time */ 204 if (pdata->tsi_prebias) { 205 data = pdata->tsi_prebias; 206 ret = pm860x_reg_write(i2c, 207 PM8607_TSI_PREBIAS, data); 208 if (ret < 0) 209 return -EINVAL; 210 } 211 /* set prebias & prechg time of pen detect */ 212 data = 0; 213 data |= pdata->pen_prebias 214 & PM8607_PD_PREBIAS_MASK; 215 data |= (pdata->pen_prechg << 5) 216 & PM8607_PD_PRECHG_MASK; 217 if (data) { 218 ret = pm860x_reg_write(i2c, 219 PM8607_PD_PREBIAS, data); 220 if (ret < 0) 221 return -EINVAL; 222 } 223 res_x = pdata->res_x; 224 } else { 225 dev_err(&pdev->dev, "failed to get platform data\n"); 226 return -EINVAL; 227 } 228 } 229 /* enable GPADC */ 230 ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, PM8607_GPADC_EN, 231 PM8607_GPADC_EN); 232 if (ret) 233 return ret; 234 235 touch = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_touch), 236 GFP_KERNEL); 237 if (!touch) 238 return -ENOMEM; 239 240 touch->idev = devm_input_allocate_device(&pdev->dev); 241 if (!touch->idev) { 242 dev_err(&pdev->dev, "Failed to allocate input device!\n"); 243 return -ENOMEM; 244 } 245 246 touch->idev->name = "88pm860x-touch"; 247 touch->idev->phys = "88pm860x/input0"; 248 touch->idev->id.bustype = BUS_I2C; 249 touch->idev->dev.parent = &pdev->dev; 250 touch->idev->open = pm860x_touch_open; 251 touch->idev->close = pm860x_touch_close; 252 touch->chip = chip; 253 touch->i2c = i2c; 254 touch->irq = irq; 255 touch->res_x = res_x; 256 input_set_drvdata(touch->idev, touch); 257 258 ret = devm_request_threaded_irq(&pdev->dev, touch->irq, NULL, 259 pm860x_touch_handler, IRQF_ONESHOT, 260 "touch", touch); 261 if (ret < 0) 262 return ret; 263 264 __set_bit(EV_ABS, touch->idev->evbit); 265 __set_bit(ABS_X, touch->idev->absbit); 266 __set_bit(ABS_Y, touch->idev->absbit); 267 __set_bit(ABS_PRESSURE, touch->idev->absbit); 268 __set_bit(EV_SYN, touch->idev->evbit); 269 __set_bit(EV_KEY, touch->idev->evbit); 270 __set_bit(BTN_TOUCH, touch->idev->keybit); 271 272 input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0); 273 input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0); 274 input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT, 275 0, 0); 276 277 ret = input_register_device(touch->idev); 278 if (ret < 0) { 279 dev_err(chip->dev, "Failed to register touch!\n"); 280 return ret; 281 } 282 283 return 0; 284 } 285 286 static struct platform_driver pm860x_touch_driver = { 287 .driver = { 288 .name = "88pm860x-touch", 289 }, 290 .probe = pm860x_touch_probe, 291 }; 292 module_platform_driver(pm860x_touch_driver); 293 294 MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x"); 295 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 296 MODULE_LICENSE("GPL"); 297 MODULE_ALIAS("platform:88pm860x-touch"); 298 299