1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2f1443404SH. Nikolaus Schaller /* 3f1443404SH. Nikolaus Schaller * drivers/input/touchscreen/tsc2007.c 4f1443404SH. Nikolaus Schaller * 5f1443404SH. Nikolaus Schaller * Copyright (c) 2008 MtekVision Co., Ltd. 6f1443404SH. Nikolaus Schaller * Kwangwoo Lee <kwlee@mtekvision.com> 7f1443404SH. Nikolaus Schaller * 8f1443404SH. Nikolaus Schaller * Using code from: 9f1443404SH. Nikolaus Schaller * - ads7846.c 10f1443404SH. Nikolaus Schaller * Copyright (c) 2005 David Brownell 11f1443404SH. Nikolaus Schaller * Copyright (c) 2006 Nokia Corporation 12f1443404SH. Nikolaus Schaller * - corgi_ts.c 13f1443404SH. Nikolaus Schaller * Copyright (C) 2004-2005 Richard Purdie 14f1443404SH. Nikolaus Schaller * - omap_ts.[hc], ads7846.h, ts_osk.c 15f1443404SH. Nikolaus Schaller * Copyright (C) 2002 MontaVista Software 16f1443404SH. Nikolaus Schaller * Copyright (C) 2004 Texas Instruments 17f1443404SH. Nikolaus Schaller * Copyright (C) 2005 Dirk Behme 18f1443404SH. Nikolaus Schaller */ 19f1443404SH. Nikolaus Schaller 20f1443404SH. Nikolaus Schaller #include <linux/module.h> 21f1443404SH. Nikolaus Schaller #include <linux/slab.h> 22cee451c9SAndy Shevchenko #include <linux/gpio/consumer.h> 23f1443404SH. Nikolaus Schaller #include <linux/input.h> 24f1443404SH. Nikolaus Schaller #include <linux/interrupt.h> 25f1443404SH. Nikolaus Schaller #include <linux/i2c.h> 26e512a9e9SAndy Shevchenko #include <linux/mod_devicetable.h> 27e512a9e9SAndy Shevchenko #include <linux/property.h> 288fd70815SWolfram Sang #include <linux/platform_data/tsc2007.h> 29f1443404SH. Nikolaus Schaller #include "tsc2007.h" 30f1443404SH. Nikolaus Schaller 31f1443404SH. Nikolaus Schaller int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd) 32f1443404SH. Nikolaus Schaller { 33f1443404SH. Nikolaus Schaller s32 data; 34f1443404SH. Nikolaus Schaller u16 val; 35f1443404SH. Nikolaus Schaller 36f1443404SH. Nikolaus Schaller data = i2c_smbus_read_word_data(tsc->client, cmd); 37f1443404SH. Nikolaus Schaller if (data < 0) { 38f1443404SH. Nikolaus Schaller dev_err(&tsc->client->dev, "i2c io error: %d\n", data); 39f1443404SH. Nikolaus Schaller return data; 40f1443404SH. Nikolaus Schaller } 41f1443404SH. Nikolaus Schaller 42f1443404SH. Nikolaus Schaller /* The protocol and raw data format from i2c interface: 43f1443404SH. Nikolaus Schaller * S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P 44f1443404SH. Nikolaus Schaller * Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 | Dummy 4bit]. 45f1443404SH. Nikolaus Schaller */ 46f1443404SH. Nikolaus Schaller val = swab16(data) >> 4; 47f1443404SH. Nikolaus Schaller 48f1443404SH. Nikolaus Schaller dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val); 49f1443404SH. Nikolaus Schaller 50f1443404SH. Nikolaus Schaller return val; 51f1443404SH. Nikolaus Schaller } 52f1443404SH. Nikolaus Schaller 53f1443404SH. Nikolaus Schaller static void tsc2007_read_values(struct tsc2007 *tsc, struct ts_event *tc) 54f1443404SH. Nikolaus Schaller { 55f1443404SH. Nikolaus Schaller /* y- still on; turn on only y+ (and ADC) */ 56f1443404SH. Nikolaus Schaller tc->y = tsc2007_xfer(tsc, READ_Y); 57f1443404SH. Nikolaus Schaller 58f1443404SH. Nikolaus Schaller /* turn y- off, x+ on, then leave in lowpower */ 59f1443404SH. Nikolaus Schaller tc->x = tsc2007_xfer(tsc, READ_X); 60f1443404SH. Nikolaus Schaller 61f1443404SH. Nikolaus Schaller /* turn y+ off, x- on; we'll use formula #1 */ 62f1443404SH. Nikolaus Schaller tc->z1 = tsc2007_xfer(tsc, READ_Z1); 63f1443404SH. Nikolaus Schaller tc->z2 = tsc2007_xfer(tsc, READ_Z2); 64f1443404SH. Nikolaus Schaller 65f1443404SH. Nikolaus Schaller /* Prepare for next touch reading - power down ADC, enable PENIRQ */ 66f1443404SH. Nikolaus Schaller tsc2007_xfer(tsc, PWRDOWN); 67f1443404SH. Nikolaus Schaller } 68f1443404SH. Nikolaus Schaller 69deec586dSH. Nikolaus Schaller u32 tsc2007_calculate_resistance(struct tsc2007 *tsc, struct ts_event *tc) 70f1443404SH. Nikolaus Schaller { 71f1443404SH. Nikolaus Schaller u32 rt = 0; 72f1443404SH. Nikolaus Schaller 73f1443404SH. Nikolaus Schaller /* range filtering */ 74f1443404SH. Nikolaus Schaller if (tc->x == MAX_12BIT) 75f1443404SH. Nikolaus Schaller tc->x = 0; 76f1443404SH. Nikolaus Schaller 77f1443404SH. Nikolaus Schaller if (likely(tc->x && tc->z1)) { 78deec586dSH. Nikolaus Schaller /* compute touch resistance using equation #1 */ 79f1443404SH. Nikolaus Schaller rt = tc->z2 - tc->z1; 80f1443404SH. Nikolaus Schaller rt *= tc->x; 81f1443404SH. Nikolaus Schaller rt *= tsc->x_plate_ohms; 82f1443404SH. Nikolaus Schaller rt /= tc->z1; 83f1443404SH. Nikolaus Schaller rt = (rt + 2047) >> 12; 84f1443404SH. Nikolaus Schaller } 85f1443404SH. Nikolaus Schaller 86f1443404SH. Nikolaus Schaller return rt; 87f1443404SH. Nikolaus Schaller } 88f1443404SH. Nikolaus Schaller 89f1443404SH. Nikolaus Schaller bool tsc2007_is_pen_down(struct tsc2007 *ts) 90f1443404SH. Nikolaus Schaller { 91f1443404SH. Nikolaus Schaller /* 92f1443404SH. Nikolaus Schaller * NOTE: We can't rely on the pressure to determine the pen down 93f1443404SH. Nikolaus Schaller * state, even though this controller has a pressure sensor. 94f1443404SH. Nikolaus Schaller * The pressure value can fluctuate for quite a while after 95f1443404SH. Nikolaus Schaller * lifting the pen and in some cases may not even settle at the 96f1443404SH. Nikolaus Schaller * expected value. 97f1443404SH. Nikolaus Schaller * 98f1443404SH. Nikolaus Schaller * The only safe way to check for the pen up condition is in the 99f1443404SH. Nikolaus Schaller * work function by reading the pen signal state (it's a GPIO 100f1443404SH. Nikolaus Schaller * and IRQ). Unfortunately such callback is not always available, 101f1443404SH. Nikolaus Schaller * in that case we assume that the pen is down and expect caller 102f1443404SH. Nikolaus Schaller * to fall back on the pressure reading. 103f1443404SH. Nikolaus Schaller */ 104f1443404SH. Nikolaus Schaller 105f1443404SH. Nikolaus Schaller if (!ts->get_pendown_state) 106f1443404SH. Nikolaus Schaller return true; 107f1443404SH. Nikolaus Schaller 108f1443404SH. Nikolaus Schaller return ts->get_pendown_state(&ts->client->dev); 109f1443404SH. Nikolaus Schaller } 110f1443404SH. Nikolaus Schaller 111f1443404SH. Nikolaus Schaller static irqreturn_t tsc2007_soft_irq(int irq, void *handle) 112f1443404SH. Nikolaus Schaller { 113f1443404SH. Nikolaus Schaller struct tsc2007 *ts = handle; 114f1443404SH. Nikolaus Schaller struct input_dev *input = ts->input; 115f1443404SH. Nikolaus Schaller struct ts_event tc; 116f1443404SH. Nikolaus Schaller u32 rt; 117f1443404SH. Nikolaus Schaller 118f1443404SH. Nikolaus Schaller while (!ts->stopped && tsc2007_is_pen_down(ts)) { 119f1443404SH. Nikolaus Schaller 120f1443404SH. Nikolaus Schaller /* pen is down, continue with the measurement */ 121f1443404SH. Nikolaus Schaller 122f1443404SH. Nikolaus Schaller mutex_lock(&ts->mlock); 123f1443404SH. Nikolaus Schaller tsc2007_read_values(ts, &tc); 124f1443404SH. Nikolaus Schaller mutex_unlock(&ts->mlock); 125f1443404SH. Nikolaus Schaller 126deec586dSH. Nikolaus Schaller rt = tsc2007_calculate_resistance(ts, &tc); 127f1443404SH. Nikolaus Schaller 128f1443404SH. Nikolaus Schaller if (!rt && !ts->get_pendown_state) { 129f1443404SH. Nikolaus Schaller /* 130f1443404SH. Nikolaus Schaller * If pressure reported is 0 and we don't have 131f1443404SH. Nikolaus Schaller * callback to check pendown state, we have to 132f1443404SH. Nikolaus Schaller * assume that pen was lifted up. 133f1443404SH. Nikolaus Schaller */ 134f1443404SH. Nikolaus Schaller break; 135f1443404SH. Nikolaus Schaller } 136f1443404SH. Nikolaus Schaller 137f1443404SH. Nikolaus Schaller if (rt <= ts->max_rt) { 138f1443404SH. Nikolaus Schaller dev_dbg(&ts->client->dev, 139deec586dSH. Nikolaus Schaller "DOWN point(%4d,%4d), resistance (%4u)\n", 140f1443404SH. Nikolaus Schaller tc.x, tc.y, rt); 141f1443404SH. Nikolaus Schaller 142db4572ffSH. Nikolaus Schaller rt = ts->max_rt - rt; 143db4572ffSH. Nikolaus Schaller 144f1443404SH. Nikolaus Schaller input_report_key(input, BTN_TOUCH, 1); 145f1443404SH. Nikolaus Schaller input_report_abs(input, ABS_X, tc.x); 146f1443404SH. Nikolaus Schaller input_report_abs(input, ABS_Y, tc.y); 147f1443404SH. Nikolaus Schaller input_report_abs(input, ABS_PRESSURE, rt); 148f1443404SH. Nikolaus Schaller 149f1443404SH. Nikolaus Schaller input_sync(input); 150f1443404SH. Nikolaus Schaller 151f1443404SH. Nikolaus Schaller } else { 152f1443404SH. Nikolaus Schaller /* 153f1443404SH. Nikolaus Schaller * Sample found inconsistent by debouncing or pressure is 154f1443404SH. Nikolaus Schaller * beyond the maximum. Don't report it to user space, 155f1443404SH. Nikolaus Schaller * repeat at least once more the measurement. 156f1443404SH. Nikolaus Schaller */ 157f1443404SH. Nikolaus Schaller dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt); 158f1443404SH. Nikolaus Schaller } 159f1443404SH. Nikolaus Schaller 160f1443404SH. Nikolaus Schaller wait_event_timeout(ts->wait, ts->stopped, ts->poll_period); 161f1443404SH. Nikolaus Schaller } 162f1443404SH. Nikolaus Schaller 163f1443404SH. Nikolaus Schaller dev_dbg(&ts->client->dev, "UP\n"); 164f1443404SH. Nikolaus Schaller 165f1443404SH. Nikolaus Schaller input_report_key(input, BTN_TOUCH, 0); 166f1443404SH. Nikolaus Schaller input_report_abs(input, ABS_PRESSURE, 0); 167f1443404SH. Nikolaus Schaller input_sync(input); 168f1443404SH. Nikolaus Schaller 169f1443404SH. Nikolaus Schaller if (ts->clear_penirq) 170f1443404SH. Nikolaus Schaller ts->clear_penirq(); 171f1443404SH. Nikolaus Schaller 172f1443404SH. Nikolaus Schaller return IRQ_HANDLED; 173f1443404SH. Nikolaus Schaller } 174f1443404SH. Nikolaus Schaller 175f1443404SH. Nikolaus Schaller static irqreturn_t tsc2007_hard_irq(int irq, void *handle) 176f1443404SH. Nikolaus Schaller { 177f1443404SH. Nikolaus Schaller struct tsc2007 *ts = handle; 178f1443404SH. Nikolaus Schaller 179f1443404SH. Nikolaus Schaller if (tsc2007_is_pen_down(ts)) 180f1443404SH. Nikolaus Schaller return IRQ_WAKE_THREAD; 181f1443404SH. Nikolaus Schaller 182f1443404SH. Nikolaus Schaller if (ts->clear_penirq) 183f1443404SH. Nikolaus Schaller ts->clear_penirq(); 184f1443404SH. Nikolaus Schaller 185f1443404SH. Nikolaus Schaller return IRQ_HANDLED; 186f1443404SH. Nikolaus Schaller } 187f1443404SH. Nikolaus Schaller 188f1443404SH. Nikolaus Schaller static void tsc2007_stop(struct tsc2007 *ts) 189f1443404SH. Nikolaus Schaller { 190f1443404SH. Nikolaus Schaller ts->stopped = true; 191f1443404SH. Nikolaus Schaller mb(); 192f1443404SH. Nikolaus Schaller wake_up(&ts->wait); 193f1443404SH. Nikolaus Schaller 194f1443404SH. Nikolaus Schaller disable_irq(ts->irq); 195f1443404SH. Nikolaus Schaller } 196f1443404SH. Nikolaus Schaller 197f1443404SH. Nikolaus Schaller static int tsc2007_open(struct input_dev *input_dev) 198f1443404SH. Nikolaus Schaller { 199f1443404SH. Nikolaus Schaller struct tsc2007 *ts = input_get_drvdata(input_dev); 200f1443404SH. Nikolaus Schaller int err; 201f1443404SH. Nikolaus Schaller 202f1443404SH. Nikolaus Schaller ts->stopped = false; 203f1443404SH. Nikolaus Schaller mb(); 204f1443404SH. Nikolaus Schaller 205f1443404SH. Nikolaus Schaller enable_irq(ts->irq); 206f1443404SH. Nikolaus Schaller 207f1443404SH. Nikolaus Schaller /* Prepare for touch readings - power down ADC and enable PENIRQ */ 208f1443404SH. Nikolaus Schaller err = tsc2007_xfer(ts, PWRDOWN); 209f1443404SH. Nikolaus Schaller if (err < 0) { 210f1443404SH. Nikolaus Schaller tsc2007_stop(ts); 211f1443404SH. Nikolaus Schaller return err; 212f1443404SH. Nikolaus Schaller } 213f1443404SH. Nikolaus Schaller 214f1443404SH. Nikolaus Schaller return 0; 215f1443404SH. Nikolaus Schaller } 216f1443404SH. Nikolaus Schaller 217f1443404SH. Nikolaus Schaller static void tsc2007_close(struct input_dev *input_dev) 218f1443404SH. Nikolaus Schaller { 219f1443404SH. Nikolaus Schaller struct tsc2007 *ts = input_get_drvdata(input_dev); 220f1443404SH. Nikolaus Schaller 221f1443404SH. Nikolaus Schaller tsc2007_stop(ts); 222f1443404SH. Nikolaus Schaller } 223f1443404SH. Nikolaus Schaller 224f1443404SH. Nikolaus Schaller static int tsc2007_get_pendown_state_gpio(struct device *dev) 225f1443404SH. Nikolaus Schaller { 226f1443404SH. Nikolaus Schaller struct i2c_client *client = to_i2c_client(dev); 227f1443404SH. Nikolaus Schaller struct tsc2007 *ts = i2c_get_clientdata(client); 228f1443404SH. Nikolaus Schaller 229cee451c9SAndy Shevchenko return gpiod_get_value(ts->gpiod); 230f1443404SH. Nikolaus Schaller } 231f1443404SH. Nikolaus Schaller 232e512a9e9SAndy Shevchenko static int tsc2007_probe_properties(struct device *dev, struct tsc2007 *ts) 233f1443404SH. Nikolaus Schaller { 234f1443404SH. Nikolaus Schaller u32 val32; 235f1443404SH. Nikolaus Schaller u64 val64; 236f1443404SH. Nikolaus Schaller 237e512a9e9SAndy Shevchenko if (!device_property_read_u32(dev, "ti,max-rt", &val32)) 238f1443404SH. Nikolaus Schaller ts->max_rt = val32; 239f1443404SH. Nikolaus Schaller else 240f1443404SH. Nikolaus Schaller ts->max_rt = MAX_12BIT; 241f1443404SH. Nikolaus Schaller 242e512a9e9SAndy Shevchenko if (!device_property_read_u32(dev, "ti,fuzzx", &val32)) 243f1443404SH. Nikolaus Schaller ts->fuzzx = val32; 244f1443404SH. Nikolaus Schaller 245e512a9e9SAndy Shevchenko if (!device_property_read_u32(dev, "ti,fuzzy", &val32)) 246f1443404SH. Nikolaus Schaller ts->fuzzy = val32; 247f1443404SH. Nikolaus Schaller 248e512a9e9SAndy Shevchenko if (!device_property_read_u32(dev, "ti,fuzzz", &val32)) 249f1443404SH. Nikolaus Schaller ts->fuzzz = val32; 250f1443404SH. Nikolaus Schaller 251e512a9e9SAndy Shevchenko if (!device_property_read_u64(dev, "ti,poll-period", &val64)) 252f1443404SH. Nikolaus Schaller ts->poll_period = msecs_to_jiffies(val64); 253f1443404SH. Nikolaus Schaller else 254f1443404SH. Nikolaus Schaller ts->poll_period = msecs_to_jiffies(1); 255f1443404SH. Nikolaus Schaller 256e512a9e9SAndy Shevchenko if (!device_property_read_u32(dev, "ti,x-plate-ohms", &val32)) { 257f1443404SH. Nikolaus Schaller ts->x_plate_ohms = val32; 258f1443404SH. Nikolaus Schaller } else { 259e512a9e9SAndy Shevchenko dev_err(dev, "Missing ti,x-plate-ohms device property\n"); 260f1443404SH. Nikolaus Schaller return -EINVAL; 261f1443404SH. Nikolaus Schaller } 262f1443404SH. Nikolaus Schaller 263e512a9e9SAndy Shevchenko ts->gpiod = devm_gpiod_get_optional(dev, NULL, GPIOD_IN); 264cee451c9SAndy Shevchenko if (IS_ERR(ts->gpiod)) 265cee451c9SAndy Shevchenko return PTR_ERR(ts->gpiod); 266cee451c9SAndy Shevchenko 267cee451c9SAndy Shevchenko if (ts->gpiod) 268f1443404SH. Nikolaus Schaller ts->get_pendown_state = tsc2007_get_pendown_state_gpio; 269f1443404SH. Nikolaus Schaller else 270e512a9e9SAndy Shevchenko dev_warn(dev, "Pen down GPIO is not specified in properties\n"); 271f1443404SH. Nikolaus Schaller 272f1443404SH. Nikolaus Schaller return 0; 273f1443404SH. Nikolaus Schaller } 274f1443404SH. Nikolaus Schaller 275e512a9e9SAndy Shevchenko static int tsc2007_probe_pdev(struct device *dev, struct tsc2007 *ts, 276f1443404SH. Nikolaus Schaller const struct tsc2007_platform_data *pdata, 277f1443404SH. Nikolaus Schaller const struct i2c_device_id *id) 278f1443404SH. Nikolaus Schaller { 279f1443404SH. Nikolaus Schaller ts->model = pdata->model; 280f1443404SH. Nikolaus Schaller ts->x_plate_ohms = pdata->x_plate_ohms; 281f1443404SH. Nikolaus Schaller ts->max_rt = pdata->max_rt ? : MAX_12BIT; 282f1443404SH. Nikolaus Schaller ts->poll_period = msecs_to_jiffies(pdata->poll_period ? : 1); 283f1443404SH. Nikolaus Schaller ts->get_pendown_state = pdata->get_pendown_state; 284f1443404SH. Nikolaus Schaller ts->clear_penirq = pdata->clear_penirq; 285f1443404SH. Nikolaus Schaller ts->fuzzx = pdata->fuzzx; 286f1443404SH. Nikolaus Schaller ts->fuzzy = pdata->fuzzy; 287f1443404SH. Nikolaus Schaller ts->fuzzz = pdata->fuzzz; 288f1443404SH. Nikolaus Schaller 289f1443404SH. Nikolaus Schaller if (pdata->x_plate_ohms == 0) { 290e512a9e9SAndy Shevchenko dev_err(dev, "x_plate_ohms is not set up in platform data\n"); 291f1443404SH. Nikolaus Schaller return -EINVAL; 292f1443404SH. Nikolaus Schaller } 293f1443404SH. Nikolaus Schaller 294f1443404SH. Nikolaus Schaller return 0; 295f1443404SH. Nikolaus Schaller } 296f1443404SH. Nikolaus Schaller 297f1443404SH. Nikolaus Schaller static void tsc2007_call_exit_platform_hw(void *data) 298f1443404SH. Nikolaus Schaller { 299f1443404SH. Nikolaus Schaller struct device *dev = data; 300f1443404SH. Nikolaus Schaller const struct tsc2007_platform_data *pdata = dev_get_platdata(dev); 301f1443404SH. Nikolaus Schaller 302f1443404SH. Nikolaus Schaller pdata->exit_platform_hw(); 303f1443404SH. Nikolaus Schaller } 304f1443404SH. Nikolaus Schaller 305*4e9d70a9SUwe Kleine-König static int tsc2007_probe(struct i2c_client *client) 306f1443404SH. Nikolaus Schaller { 307*4e9d70a9SUwe Kleine-König const struct i2c_device_id *id = i2c_client_get_device_id(client); 308f1443404SH. Nikolaus Schaller const struct tsc2007_platform_data *pdata = 309f1443404SH. Nikolaus Schaller dev_get_platdata(&client->dev); 310f1443404SH. Nikolaus Schaller struct tsc2007 *ts; 311f1443404SH. Nikolaus Schaller struct input_dev *input_dev; 312f1443404SH. Nikolaus Schaller int err; 313f1443404SH. Nikolaus Schaller 314f1443404SH. Nikolaus Schaller if (!i2c_check_functionality(client->adapter, 315f1443404SH. Nikolaus Schaller I2C_FUNC_SMBUS_READ_WORD_DATA)) 316f1443404SH. Nikolaus Schaller return -EIO; 317f1443404SH. Nikolaus Schaller 318f1443404SH. Nikolaus Schaller ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL); 319f1443404SH. Nikolaus Schaller if (!ts) 320f1443404SH. Nikolaus Schaller return -ENOMEM; 321f1443404SH. Nikolaus Schaller 322f1443404SH. Nikolaus Schaller if (pdata) 323e512a9e9SAndy Shevchenko err = tsc2007_probe_pdev(&client->dev, ts, pdata, id); 324f1443404SH. Nikolaus Schaller else 325e512a9e9SAndy Shevchenko err = tsc2007_probe_properties(&client->dev, ts); 326f1443404SH. Nikolaus Schaller if (err) 327f1443404SH. Nikolaus Schaller return err; 328f1443404SH. Nikolaus Schaller 329f1443404SH. Nikolaus Schaller input_dev = devm_input_allocate_device(&client->dev); 330f1443404SH. Nikolaus Schaller if (!input_dev) 331f1443404SH. Nikolaus Schaller return -ENOMEM; 332f1443404SH. Nikolaus Schaller 333f1443404SH. Nikolaus Schaller i2c_set_clientdata(client, ts); 334f1443404SH. Nikolaus Schaller 335f1443404SH. Nikolaus Schaller ts->client = client; 336f1443404SH. Nikolaus Schaller ts->irq = client->irq; 337f1443404SH. Nikolaus Schaller ts->input = input_dev; 338f1443404SH. Nikolaus Schaller 339f1443404SH. Nikolaus Schaller init_waitqueue_head(&ts->wait); 340f1443404SH. Nikolaus Schaller mutex_init(&ts->mlock); 341f1443404SH. Nikolaus Schaller 342f1443404SH. Nikolaus Schaller snprintf(ts->phys, sizeof(ts->phys), 343f1443404SH. Nikolaus Schaller "%s/input0", dev_name(&client->dev)); 344f1443404SH. Nikolaus Schaller 345f1443404SH. Nikolaus Schaller input_dev->name = "TSC2007 Touchscreen"; 346f1443404SH. Nikolaus Schaller input_dev->phys = ts->phys; 347f1443404SH. Nikolaus Schaller input_dev->id.bustype = BUS_I2C; 348f1443404SH. Nikolaus Schaller 349f1443404SH. Nikolaus Schaller input_dev->open = tsc2007_open; 350f1443404SH. Nikolaus Schaller input_dev->close = tsc2007_close; 351f1443404SH. Nikolaus Schaller 352f1443404SH. Nikolaus Schaller input_set_drvdata(input_dev, ts); 353f1443404SH. Nikolaus Schaller 354c61ebe83SDmitry Torokhov input_set_capability(input_dev, EV_KEY, BTN_TOUCH); 355f1443404SH. Nikolaus Schaller 356f1443404SH. Nikolaus Schaller input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzx, 0); 357f1443404SH. Nikolaus Schaller input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0); 358f1443404SH. Nikolaus Schaller input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 359f1443404SH. Nikolaus Schaller ts->fuzzz, 0); 360f1443404SH. Nikolaus Schaller 361f1443404SH. Nikolaus Schaller if (pdata) { 362f1443404SH. Nikolaus Schaller if (pdata->exit_platform_hw) { 363f1443404SH. Nikolaus Schaller err = devm_add_action(&client->dev, 364f1443404SH. Nikolaus Schaller tsc2007_call_exit_platform_hw, 365f1443404SH. Nikolaus Schaller &client->dev); 366f1443404SH. Nikolaus Schaller if (err) { 367f1443404SH. Nikolaus Schaller dev_err(&client->dev, 368f1443404SH. Nikolaus Schaller "Failed to register exit_platform_hw action, %d\n", 369f1443404SH. Nikolaus Schaller err); 370f1443404SH. Nikolaus Schaller return err; 371f1443404SH. Nikolaus Schaller } 372f1443404SH. Nikolaus Schaller } 373f1443404SH. Nikolaus Schaller 374f1443404SH. Nikolaus Schaller if (pdata->init_platform_hw) 375f1443404SH. Nikolaus Schaller pdata->init_platform_hw(); 376f1443404SH. Nikolaus Schaller } 377f1443404SH. Nikolaus Schaller 378f1443404SH. Nikolaus Schaller err = devm_request_threaded_irq(&client->dev, ts->irq, 379f1443404SH. Nikolaus Schaller tsc2007_hard_irq, tsc2007_soft_irq, 380f1443404SH. Nikolaus Schaller IRQF_ONESHOT, 381f1443404SH. Nikolaus Schaller client->dev.driver->name, ts); 382f1443404SH. Nikolaus Schaller if (err) { 383f1443404SH. Nikolaus Schaller dev_err(&client->dev, "Failed to request irq %d: %d\n", 384f1443404SH. Nikolaus Schaller ts->irq, err); 385f1443404SH. Nikolaus Schaller return err; 386f1443404SH. Nikolaus Schaller } 387f1443404SH. Nikolaus Schaller 388f1443404SH. Nikolaus Schaller tsc2007_stop(ts); 389f1443404SH. Nikolaus Schaller 390f1443404SH. Nikolaus Schaller /* power down the chip (TSC2007_SETUP does not ACK on I2C) */ 391f1443404SH. Nikolaus Schaller err = tsc2007_xfer(ts, PWRDOWN); 392f1443404SH. Nikolaus Schaller if (err < 0) { 393f1443404SH. Nikolaus Schaller dev_err(&client->dev, 394f1443404SH. Nikolaus Schaller "Failed to setup chip: %d\n", err); 395f1443404SH. Nikolaus Schaller return err; /* chip does not respond */ 396f1443404SH. Nikolaus Schaller } 397f1443404SH. Nikolaus Schaller 398f1443404SH. Nikolaus Schaller err = input_register_device(input_dev); 399f1443404SH. Nikolaus Schaller if (err) { 400f1443404SH. Nikolaus Schaller dev_err(&client->dev, 401f1443404SH. Nikolaus Schaller "Failed to register input device: %d\n", err); 402f1443404SH. Nikolaus Schaller return err; 403f1443404SH. Nikolaus Schaller } 404f1443404SH. Nikolaus Schaller 405f1443404SH. Nikolaus Schaller err = tsc2007_iio_configure(ts); 406f1443404SH. Nikolaus Schaller if (err) { 407f1443404SH. Nikolaus Schaller dev_err(&client->dev, 408f1443404SH. Nikolaus Schaller "Failed to register with IIO: %d\n", err); 409f1443404SH. Nikolaus Schaller return err; 410f1443404SH. Nikolaus Schaller } 411f1443404SH. Nikolaus Schaller 412f1443404SH. Nikolaus Schaller return 0; 413f1443404SH. Nikolaus Schaller } 414f1443404SH. Nikolaus Schaller 415f1443404SH. Nikolaus Schaller static const struct i2c_device_id tsc2007_idtable[] = { 416f1443404SH. Nikolaus Schaller { "tsc2007", 0 }, 417f1443404SH. Nikolaus Schaller { } 418f1443404SH. Nikolaus Schaller }; 419f1443404SH. Nikolaus Schaller 420f1443404SH. Nikolaus Schaller MODULE_DEVICE_TABLE(i2c, tsc2007_idtable); 421f1443404SH. Nikolaus Schaller 422f1443404SH. Nikolaus Schaller static const struct of_device_id tsc2007_of_match[] = { 423f1443404SH. Nikolaus Schaller { .compatible = "ti,tsc2007" }, 424f1443404SH. Nikolaus Schaller { /* sentinel */ } 425f1443404SH. Nikolaus Schaller }; 426f1443404SH. Nikolaus Schaller MODULE_DEVICE_TABLE(of, tsc2007_of_match); 427f1443404SH. Nikolaus Schaller 428f1443404SH. Nikolaus Schaller static struct i2c_driver tsc2007_driver = { 429f1443404SH. Nikolaus Schaller .driver = { 430f1443404SH. Nikolaus Schaller .name = "tsc2007", 431e512a9e9SAndy Shevchenko .of_match_table = tsc2007_of_match, 432f1443404SH. Nikolaus Schaller }, 433f1443404SH. Nikolaus Schaller .id_table = tsc2007_idtable, 434*4e9d70a9SUwe Kleine-König .probe_new = tsc2007_probe, 435f1443404SH. Nikolaus Schaller }; 436f1443404SH. Nikolaus Schaller 437f1443404SH. Nikolaus Schaller module_i2c_driver(tsc2007_driver); 438f1443404SH. Nikolaus Schaller 439f1443404SH. Nikolaus Schaller MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>"); 440f1443404SH. Nikolaus Schaller MODULE_DESCRIPTION("TSC2007 TouchScreen Driver"); 441f1443404SH. Nikolaus Schaller MODULE_LICENSE("GPL"); 442