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 20 #define MEAS_LEN (8) 21 #define ACCURATE_BIT (12) 22 23 /* touch register */ 24 #define MEAS_EN3 (0x52) 25 26 #define MEAS_TSIX_1 (0x8D) 27 #define MEAS_TSIX_2 (0x8E) 28 #define MEAS_TSIY_1 (0x8F) 29 #define MEAS_TSIY_2 (0x90) 30 #define MEAS_TSIZ1_1 (0x91) 31 #define MEAS_TSIZ1_2 (0x92) 32 #define MEAS_TSIZ2_1 (0x93) 33 #define MEAS_TSIZ2_2 (0x94) 34 35 /* bit definitions of touch */ 36 #define MEAS_PD_EN (1 << 3) 37 #define MEAS_TSIX_EN (1 << 4) 38 #define MEAS_TSIY_EN (1 << 5) 39 #define MEAS_TSIZ1_EN (1 << 6) 40 #define MEAS_TSIZ2_EN (1 << 7) 41 42 struct pm860x_touch { 43 struct input_dev *idev; 44 struct i2c_client *i2c; 45 struct pm860x_chip *chip; 46 int irq; 47 int res_x; /* resistor of Xplate */ 48 }; 49 50 static irqreturn_t pm860x_touch_handler(int irq, void *data) 51 { 52 struct pm860x_touch *touch = data; 53 struct pm860x_chip *chip = touch->chip; 54 unsigned char buf[MEAS_LEN]; 55 int x, y, pen_down; 56 int z1, z2, rt = 0; 57 int ret; 58 59 ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf); 60 if (ret < 0) 61 goto out; 62 63 pen_down = buf[1] & (1 << 6); 64 x = ((buf[0] & 0xFF) << 4) | (buf[1] & 0x0F); 65 y = ((buf[2] & 0xFF) << 4) | (buf[3] & 0x0F); 66 z1 = ((buf[4] & 0xFF) << 4) | (buf[5] & 0x0F); 67 z2 = ((buf[6] & 0xFF) << 4) | (buf[7] & 0x0F); 68 69 if (pen_down) { 70 if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) { 71 rt = z2 / z1 - 1; 72 rt = (rt * touch->res_x * x) >> ACCURATE_BIT; 73 dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n", 74 z1, z2, rt); 75 } 76 input_report_abs(touch->idev, ABS_X, x); 77 input_report_abs(touch->idev, ABS_Y, y); 78 input_report_abs(touch->idev, ABS_PRESSURE, rt); 79 input_report_key(touch->idev, BTN_TOUCH, 1); 80 dev_dbg(chip->dev, "pen down at [%d, %d].\n", x, y); 81 } else { 82 input_report_abs(touch->idev, ABS_PRESSURE, 0); 83 input_report_key(touch->idev, BTN_TOUCH, 0); 84 dev_dbg(chip->dev, "pen release\n"); 85 } 86 input_sync(touch->idev); 87 88 out: 89 return IRQ_HANDLED; 90 } 91 92 static int pm860x_touch_open(struct input_dev *dev) 93 { 94 struct pm860x_touch *touch = input_get_drvdata(dev); 95 int data, ret; 96 97 data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN 98 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN; 99 ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data); 100 if (ret < 0) 101 goto out; 102 return 0; 103 out: 104 return ret; 105 } 106 107 static void pm860x_touch_close(struct input_dev *dev) 108 { 109 struct pm860x_touch *touch = input_get_drvdata(dev); 110 int data; 111 112 data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN 113 | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN; 114 pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0); 115 } 116 117 #ifdef CONFIG_OF 118 static int pm860x_touch_dt_init(struct platform_device *pdev, 119 struct pm860x_chip *chip, 120 int *res_x) 121 { 122 struct device_node *np = pdev->dev.parent->of_node; 123 struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \ 124 : chip->companion; 125 int data, n, ret; 126 if (!np) 127 return -ENODEV; 128 np = of_find_node_by_name(np, "touch"); 129 if (!np) { 130 dev_err(&pdev->dev, "Can't find touch node\n"); 131 return -EINVAL; 132 } 133 /* set GPADC MISC1 register */ 134 data = 0; 135 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-prebias", &n)) 136 data |= (n << 1) & PM8607_GPADC_PREBIAS_MASK; 137 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-slot-cycle", &n)) 138 data |= (n << 3) & PM8607_GPADC_SLOT_CYCLE_MASK; 139 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-off-scale", &n)) 140 data |= (n << 5) & PM8607_GPADC_OFF_SCALE_MASK; 141 if (!of_property_read_u32(np, "marvell,88pm860x-gpadc-sw-cal", &n)) 142 data |= (n << 7) & PM8607_GPADC_SW_CAL_MASK; 143 if (data) { 144 ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data); 145 if (ret < 0) 146 return -EINVAL; 147 } 148 /* set tsi prebias time */ 149 if (!of_property_read_u32(np, "marvell,88pm860x-tsi-prebias", &data)) { 150 ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data); 151 if (ret < 0) 152 return -EINVAL; 153 } 154 /* set prebias & prechg time of pen detect */ 155 data = 0; 156 if (!of_property_read_u32(np, "marvell,88pm860x-pen-prebias", &n)) 157 data |= n & PM8607_PD_PREBIAS_MASK; 158 if (!of_property_read_u32(np, "marvell,88pm860x-pen-prechg", &n)) 159 data |= n & PM8607_PD_PRECHG_MASK; 160 if (data) { 161 ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data); 162 if (ret < 0) 163 return -EINVAL; 164 } 165 of_property_read_u32(np, "marvell,88pm860x-resistor-X", res_x); 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 dev_err(&pdev->dev, "No IRQ resource!\n"); 184 return -EINVAL; 185 } 186 187 if (pm860x_touch_dt_init(pdev, chip, &res_x)) { 188 if (pdata) { 189 /* set GPADC MISC1 register */ 190 data = 0; 191 data |= (pdata->gpadc_prebias << 1) 192 & PM8607_GPADC_PREBIAS_MASK; 193 data |= (pdata->slot_cycle << 3) 194 & PM8607_GPADC_SLOT_CYCLE_MASK; 195 data |= (pdata->off_scale << 5) 196 & PM8607_GPADC_OFF_SCALE_MASK; 197 data |= (pdata->sw_cal << 7) 198 & PM8607_GPADC_SW_CAL_MASK; 199 if (data) { 200 ret = pm860x_reg_write(i2c, 201 PM8607_GPADC_MISC1, data); 202 if (ret < 0) 203 return -EINVAL; 204 } 205 /* set tsi prebias time */ 206 if (pdata->tsi_prebias) { 207 data = pdata->tsi_prebias; 208 ret = pm860x_reg_write(i2c, 209 PM8607_TSI_PREBIAS, data); 210 if (ret < 0) 211 return -EINVAL; 212 } 213 /* set prebias & prechg time of pen detect */ 214 data = 0; 215 data |= pdata->pen_prebias 216 & PM8607_PD_PREBIAS_MASK; 217 data |= (pdata->pen_prechg << 5) 218 & PM8607_PD_PRECHG_MASK; 219 if (data) { 220 ret = pm860x_reg_write(i2c, 221 PM8607_PD_PREBIAS, data); 222 if (ret < 0) 223 return -EINVAL; 224 } 225 res_x = pdata->res_x; 226 } else { 227 dev_err(&pdev->dev, "failed to get platform data\n"); 228 return -EINVAL; 229 } 230 } 231 /* enable GPADC */ 232 ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, PM8607_GPADC_EN, 233 PM8607_GPADC_EN); 234 if (ret) 235 return ret; 236 237 touch = kzalloc(sizeof(struct pm860x_touch), GFP_KERNEL); 238 if (touch == NULL) 239 return -ENOMEM; 240 platform_set_drvdata(pdev, touch); 241 242 touch->idev = input_allocate_device(); 243 if (touch->idev == NULL) { 244 dev_err(&pdev->dev, "Failed to allocate input device!\n"); 245 ret = -ENOMEM; 246 goto out; 247 } 248 249 touch->idev->name = "88pm860x-touch"; 250 touch->idev->phys = "88pm860x/input0"; 251 touch->idev->id.bustype = BUS_I2C; 252 touch->idev->dev.parent = &pdev->dev; 253 touch->idev->open = pm860x_touch_open; 254 touch->idev->close = pm860x_touch_close; 255 touch->chip = chip; 256 touch->i2c = i2c; 257 touch->irq = irq; 258 touch->res_x = res_x; 259 input_set_drvdata(touch->idev, touch); 260 261 ret = request_threaded_irq(touch->irq, NULL, pm860x_touch_handler, 262 IRQF_ONESHOT, "touch", touch); 263 if (ret < 0) 264 goto out_irq; 265 266 __set_bit(EV_ABS, touch->idev->evbit); 267 __set_bit(ABS_X, touch->idev->absbit); 268 __set_bit(ABS_Y, touch->idev->absbit); 269 __set_bit(ABS_PRESSURE, touch->idev->absbit); 270 __set_bit(EV_SYN, touch->idev->evbit); 271 __set_bit(EV_KEY, touch->idev->evbit); 272 __set_bit(BTN_TOUCH, touch->idev->keybit); 273 274 input_set_abs_params(touch->idev, ABS_X, 0, 1 << ACCURATE_BIT, 0, 0); 275 input_set_abs_params(touch->idev, ABS_Y, 0, 1 << ACCURATE_BIT, 0, 0); 276 input_set_abs_params(touch->idev, ABS_PRESSURE, 0, 1 << ACCURATE_BIT, 277 0, 0); 278 279 ret = input_register_device(touch->idev); 280 if (ret < 0) { 281 dev_err(chip->dev, "Failed to register touch!\n"); 282 goto out_rg; 283 } 284 285 platform_set_drvdata(pdev, touch); 286 return 0; 287 out_rg: 288 free_irq(touch->irq, touch); 289 out_irq: 290 input_free_device(touch->idev); 291 out: 292 kfree(touch); 293 return ret; 294 } 295 296 static int pm860x_touch_remove(struct platform_device *pdev) 297 { 298 struct pm860x_touch *touch = platform_get_drvdata(pdev); 299 300 input_unregister_device(touch->idev); 301 free_irq(touch->irq, touch); 302 kfree(touch); 303 return 0; 304 } 305 306 static struct platform_driver pm860x_touch_driver = { 307 .driver = { 308 .name = "88pm860x-touch", 309 .owner = THIS_MODULE, 310 }, 311 .probe = pm860x_touch_probe, 312 .remove = pm860x_touch_remove, 313 }; 314 module_platform_driver(pm860x_touch_driver); 315 316 MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x"); 317 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); 318 MODULE_LICENSE("GPL"); 319 MODULE_ALIAS("platform:88pm860x-touch"); 320 321