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_find_node_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 return -EINVAL; 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 return -EINVAL; 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 return -EINVAL; 165 } 166 of_property_read_u32(np, "marvell,88pm860x-resistor-X", res_x); 167 return 0; 168 } 169 #else 170 #define pm860x_touch_dt_init(x, y, z) (-1) 171 #endif 172 173 static int pm860x_touch_probe(struct platform_device *pdev) 174 { 175 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent); 176 struct pm860x_touch_pdata *pdata = dev_get_platdata(&pdev->dev); 177 struct pm860x_touch *touch; 178 struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \ 179 : chip->companion; 180 int irq, ret, res_x = 0, data = 0; 181 182 irq = platform_get_irq(pdev, 0); 183 if (irq < 0) { 184 dev_err(&pdev->dev, "No IRQ resource!\n"); 185 return -EINVAL; 186 } 187 188 if (pm860x_touch_dt_init(pdev, chip, &res_x)) { 189 if (pdata) { 190 /* set GPADC MISC1 register */ 191 data = 0; 192 data |= (pdata->gpadc_prebias << 1) 193 & PM8607_GPADC_PREBIAS_MASK; 194 data |= (pdata->slot_cycle << 3) 195 & PM8607_GPADC_SLOT_CYCLE_MASK; 196 data |= (pdata->off_scale << 5) 197 & PM8607_GPADC_OFF_SCALE_MASK; 198 data |= (pdata->sw_cal << 7) 199 & PM8607_GPADC_SW_CAL_MASK; 200 if (data) { 201 ret = pm860x_reg_write(i2c, 202 PM8607_GPADC_MISC1, data); 203 if (ret < 0) 204 return -EINVAL; 205 } 206 /* set tsi prebias time */ 207 if (pdata->tsi_prebias) { 208 data = pdata->tsi_prebias; 209 ret = pm860x_reg_write(i2c, 210 PM8607_TSI_PREBIAS, data); 211 if (ret < 0) 212 return -EINVAL; 213 } 214 /* set prebias & prechg time of pen detect */ 215 data = 0; 216 data |= pdata->pen_prebias 217 & PM8607_PD_PREBIAS_MASK; 218 data |= (pdata->pen_prechg << 5) 219 & PM8607_PD_PRECHG_MASK; 220 if (data) { 221 ret = pm860x_reg_write(i2c, 222 PM8607_PD_PREBIAS, data); 223 if (ret < 0) 224 return -EINVAL; 225 } 226 res_x = pdata->res_x; 227 } else { 228 dev_err(&pdev->dev, "failed to get platform data\n"); 229 return -EINVAL; 230 } 231 } 232 /* enable GPADC */ 233 ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, PM8607_GPADC_EN, 234 PM8607_GPADC_EN); 235 if (ret) 236 return ret; 237 238 touch = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_touch), 239 GFP_KERNEL); 240 if (!touch) 241 return -ENOMEM; 242 243 platform_set_drvdata(pdev, touch); 244 245 touch->idev = devm_input_allocate_device(&pdev->dev); 246 if (!touch->idev) { 247 dev_err(&pdev->dev, "Failed to allocate input device!\n"); 248 return -ENOMEM; 249 } 250 251 touch->idev->name = "88pm860x-touch"; 252 touch->idev->phys = "88pm860x/input0"; 253 touch->idev->id.bustype = BUS_I2C; 254 touch->idev->dev.parent = &pdev->dev; 255 touch->idev->open = pm860x_touch_open; 256 touch->idev->close = pm860x_touch_close; 257 touch->chip = chip; 258 touch->i2c = i2c; 259 touch->irq = irq; 260 touch->res_x = res_x; 261 input_set_drvdata(touch->idev, touch); 262 263 ret = devm_request_threaded_irq(&pdev->dev, touch->irq, NULL, 264 pm860x_touch_handler, IRQF_ONESHOT, 265 "touch", touch); 266 if (ret < 0) 267 return ret; 268 269 __set_bit(EV_ABS, touch->idev->evbit); 270 __set_bit(ABS_X, touch->idev->absbit); 271 __set_bit(ABS_Y, touch->idev->absbit); 272 __set_bit(ABS_PRESSURE, touch->idev->absbit); 273 __set_bit(EV_SYN, touch->idev->evbit); 274 __set_bit(EV_KEY, touch->idev->evbit); 275 __set_bit(BTN_TOUCH, touch->idev->keybit); 276 277 input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0); 278 input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0); 279 input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT, 280 0, 0); 281 282 ret = input_register_device(touch->idev); 283 if (ret < 0) { 284 dev_err(chip->dev, "Failed to register touch!\n"); 285 return ret; 286 } 287 288 platform_set_drvdata(pdev, touch); 289 return 0; 290 } 291 292 static struct platform_driver pm860x_touch_driver = { 293 .driver = { 294 .name = "88pm860x-touch", 295 .owner = THIS_MODULE, 296 }, 297 .probe = pm860x_touch_probe, 298 }; 299 module_platform_driver(pm860x_touch_driver); 300 301 MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x"); 302 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 303 MODULE_LICENSE("GPL"); 304 MODULE_ALIAS("platform:88pm860x-touch"); 305 306