1 /* 2 * Touchscreen driver for Marvell 88PM860x 3 * 4 * Copyright (C) 2009 Marvell International Ltd. 5 * Haojian Zhuang <haojian.zhuang@marvell.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/platform_device.h> 15 #include <linux/i2c.h> 16 #include <linux/input.h> 17 #include <linux/mfd/88pm860x.h> 18 #include <linux/slab.h> 19 #include <linux/device.h> 20 21 #define MEAS_LEN (8) 22 #define ACCURATE_BIT (12) 23 24 /* touch register */ 25 #define MEAS_EN3 (0x52) 26 27 #define MEAS_TSIX_1 (0x8D) 28 #define MEAS_TSIX_2 (0x8E) 29 #define MEAS_TSIY_1 (0x8F) 30 #define MEAS_TSIY_2 (0x90) 31 #define MEAS_TSIZ1_1 (0x91) 32 #define MEAS_TSIZ1_2 (0x92) 33 #define MEAS_TSIZ2_1 (0x93) 34 #define MEAS_TSIZ2_2 (0x94) 35 36 /* bit definitions of touch */ 37 #define MEAS_PD_EN (1 << 3) 38 #define MEAS_TSIX_EN (1 << 4) 39 #define MEAS_TSIY_EN (1 << 5) 40 #define MEAS_TSIZ1_EN (1 << 6) 41 #define MEAS_TSIZ2_EN (1 << 7) 42 43 struct pm860x_touch { 44 struct input_dev *idev; 45 struct i2c_client *i2c; 46 struct pm860x_chip *chip; 47 int irq; 48 int res_x; /* resistor of Xplate */ 49 }; 50 51 static irqreturn_t pm860x_touch_handler(int irq, void *data) 52 { 53 struct pm860x_touch *touch = data; 54 struct pm860x_chip *chip = touch->chip; 55 unsigned char buf[MEAS_LEN]; 56 int x, y, pen_down; 57 int z1, z2, rt = 0; 58 int ret; 59 60 ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf); 61 if (ret < 0) 62 goto out; 63 64 pen_down = buf[1] & (1 << 6); 65 x = ((buf[0] & 0xFF) << 4) | (buf[1] & 0x0F); 66 y = ((buf[2] & 0xFF) << 4) | (buf[3] & 0x0F); 67 z1 = ((buf[4] & 0xFF) << 4) | (buf[5] & 0x0F); 68 z2 = ((buf[6] & 0xFF) << 4) | (buf[7] & 0x0F); 69 70 if (pen_down) { 71 if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) { 72 rt = z2 / z1 - 1; 73 rt = (rt * touch->res_x * x) >> ACCURATE_BIT; 74 dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n", 75 z1, z2, rt); 76 } 77 input_report_abs(touch->idev, ABS_X, x); 78 input_report_abs(touch->idev, ABS_Y, y); 79 input_report_abs(touch->idev, ABS_PRESSURE, rt); 80 input_report_key(touch->idev, BTN_TOUCH, 1); 81 dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y); 82 } else { 83 input_report_abs(touch->idev, ABS_PRESSURE, 0); 84 input_report_key(touch->idev, BTN_TOUCH, 0); 85 dev_dbg(chip->dev, "pen release\n"); 86 } 87 input_sync(touch->idev); 88 89 out: 90 return IRQ_HANDLED; 91 } 92 93 static int pm860x_touch_open(struct input_dev *dev) 94 { 95 struct pm860x_touch *touch = input_get_drvdata(dev); 96 int data, ret; 97 98 data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN 99 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN; 100 ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data); 101 if (ret < 0) 102 goto out; 103 return 0; 104 out: 105 return ret; 106 } 107 108 static void pm860x_touch_close(struct input_dev *dev) 109 { 110 struct pm860x_touch *touch = input_get_drvdata(dev); 111 int data; 112 113 data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN 114 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN; 115 pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0); 116 } 117 118 #ifdef CONFIG_OF 119 static int pm860x_touch_dt_init(struct platform_device *pdev, 120 struct pm860x_chip *chip, 121 int *res_x) 122 { 123 struct device_node *np = pdev->dev.parent->of_node; 124 struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \ 125 : chip->companion; 126 int data, n, ret; 127 if (!np) 128 return -ENODEV; 129 np = of_get_child_by_name(np, "touch"); 130 if (!np) { 131 dev_err(&pdev->dev, "Can't find touch node\n"); 132 return -EINVAL; 133 } 134 /* set GPADC MISC1 register */ 135 data = 0; 136 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-prebias", &n)) 137 data |= (n << 1) & PM8607_GPADC_PREBIAS_MASK; 138 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-slot-cycle", &n)) 139 data |= (n << 3) & PM8607_GPADC_SLOT_CYCLE_MASK; 140 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-off-scale", &n)) 141 data |= (n << 5) & PM8607_GPADC_OFF_SCALE_MASK; 142 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-sw-cal", &n)) 143 data |= (n << 7) & PM8607_GPADC_SW_CAL_MASK; 144 if (data) { 145 ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data); 146 if (ret < 0) 147 goto err_put_node; 148 } 149 /* set tsi prebias time */ 150 if (!of_property_read_u32(np, "marvell,88pm860x-tsi-prebias", &data)) { 151 ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data); 152 if (ret < 0) 153 goto err_put_node; 154 } 155 /* set prebias & prechg time of pen detect */ 156 data = 0; 157 if (!of_property_read_u32(np, "marvell,88pm860x-pen-prebias", &n)) 158 data |= n & PM8607_PD_PREBIAS_MASK; 159 if (!of_property_read_u32(np, "marvell,88pm860x-pen-prechg", &n)) 160 data |= n & PM8607_PD_PRECHG_MASK; 161 if (data) { 162 ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data); 163 if (ret < 0) 164 goto err_put_node; 165 } 166 of_property_read_u32(np, "marvell,88pm860x-resistor-X", res_x); 167 168 of_node_put(np); 169 170 return 0; 171 172 err_put_node: 173 of_node_put(np); 174 175 return -EINVAL; 176 } 177 #else 178 #define pm860x_touch_dt_init(x, y, z) (-1) 179 #endif 180 181 static int pm860x_touch_probe(struct platform_device *pdev) 182 { 183 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 184 struct pm860x_touch_pdata *pdata = dev_get_platdata(&pdev->dev); 185 struct pm860x_touch *touch; 186 struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \ 187 : chip->companion; 188 int irq, ret, res_x = 0, data = 0; 189 190 irq = platform_get_irq(pdev, 0); 191 if (irq < 0) { 192 dev_err(&pdev->dev, "No IRQ resource!\n"); 193 return -EINVAL; 194 } 195 196 if (pm860x_touch_dt_init(pdev, chip, &res_x)) { 197 if (pdata) { 198 /* set GPADC MISC1 register */ 199 data = 0; 200 data |= (pdata->gpadc_prebias << 1) 201 & PM8607_GPADC_PREBIAS_MASK; 202 data |= (pdata->slot_cycle << 3) 203 & PM8607_GPADC_SLOT_CYCLE_MASK; 204 data |= (pdata->off_scale << 5) 205 & PM8607_GPADC_OFF_SCALE_MASK; 206 data |= (pdata->sw_cal << 7) 207 & PM8607_GPADC_SW_CAL_MASK; 208 if (data) { 209 ret = pm860x_reg_write(i2c, 210 PM8607_GPADC_MISC1, data); 211 if (ret < 0) 212 return -EINVAL; 213 } 214 /* set tsi prebias time */ 215 if (pdata->tsi_prebias) { 216 data = pdata->tsi_prebias; 217 ret = pm860x_reg_write(i2c, 218 PM8607_TSI_PREBIAS, data); 219 if (ret < 0) 220 return -EINVAL; 221 } 222 /* set prebias & prechg time of pen detect */ 223 data = 0; 224 data |= pdata->pen_prebias 225 & PM8607_PD_PREBIAS_MASK; 226 data |= (pdata->pen_prechg << 5) 227 & PM8607_PD_PRECHG_MASK; 228 if (data) { 229 ret = pm860x_reg_write(i2c, 230 PM8607_PD_PREBIAS, data); 231 if (ret < 0) 232 return -EINVAL; 233 } 234 res_x = pdata->res_x; 235 } else { 236 dev_err(&pdev->dev, "failed to get platform data\n"); 237 return -EINVAL; 238 } 239 } 240 /* enable GPADC */ 241 ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, PM8607_GPADC_EN, 242 PM8607_GPADC_EN); 243 if (ret) 244 return ret; 245 246 touch = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_touch), 247 GFP_KERNEL); 248 if (!touch) 249 return -ENOMEM; 250 251 touch->idev = devm_input_allocate_device(&pdev->dev); 252 if (!touch->idev) { 253 dev_err(&pdev->dev, "Failed to allocate input device!\n"); 254 return -ENOMEM; 255 } 256 257 touch->idev->name = "88pm860x-touch"; 258 touch->idev->phys = "88pm860x/input0"; 259 touch->idev->id.bustype = BUS_I2C; 260 touch->idev->dev.parent = &pdev->dev; 261 touch->idev->open = pm860x_touch_open; 262 touch->idev->close = pm860x_touch_close; 263 touch->chip = chip; 264 touch->i2c = i2c; 265 touch->irq = irq; 266 touch->res_x = res_x; 267 input_set_drvdata(touch->idev, touch); 268 269 ret = devm_request_threaded_irq(&pdev->dev, touch->irq, NULL, 270 pm860x_touch_handler, IRQF_ONESHOT, 271 "touch", touch); 272 if (ret < 0) 273 return ret; 274 275 __set_bit(EV_ABS, touch->idev->evbit); 276 __set_bit(ABS_X, touch->idev->absbit); 277 __set_bit(ABS_Y, touch->idev->absbit); 278 __set_bit(ABS_PRESSURE, touch->idev->absbit); 279 __set_bit(EV_SYN, touch->idev->evbit); 280 __set_bit(EV_KEY, touch->idev->evbit); 281 __set_bit(BTN_TOUCH, touch->idev->keybit); 282 283 input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0); 284 input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0); 285 input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT, 286 0, 0); 287 288 ret = input_register_device(touch->idev); 289 if (ret < 0) { 290 dev_err(chip->dev, "Failed to register touch!\n"); 291 return ret; 292 } 293 294 return 0; 295 } 296 297 static struct platform_driver pm860x_touch_driver = { 298 .driver = { 299 .name = "88pm860x-touch", 300 }, 301 .probe = pm860x_touch_probe, 302 }; 303 module_platform_driver(pm860x_touch_driver); 304 305 MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x"); 306 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 307 MODULE_LICENSE("GPL"); 308 MODULE_ALIAS("platform:88pm860x-touch"); 309 310