1f1443404SH. Nikolaus Schaller /* 2f1443404SH. Nikolaus Schaller * drivers/input/touchscreen/tsc2007.c 3f1443404SH. Nikolaus Schaller * 4f1443404SH. Nikolaus Schaller * Copyright (c) 2008 MtekVision Co., Ltd. 5f1443404SH. Nikolaus Schaller * Kwangwoo Lee <kwlee@mtekvision.com> 6f1443404SH. Nikolaus Schaller * 7f1443404SH. Nikolaus Schaller * Using code from: 8f1443404SH. Nikolaus Schaller * - ads7846.c 9f1443404SH. Nikolaus Schaller * Copyright (c) 2005 David Brownell 10f1443404SH. Nikolaus Schaller * Copyright (c) 2006 Nokia Corporation 11f1443404SH. Nikolaus Schaller * - corgi_ts.c 12f1443404SH. Nikolaus Schaller * Copyright (C) 2004-2005 Richard Purdie 13f1443404SH. Nikolaus Schaller * - omap_ts.[hc], ads7846.h, ts_osk.c 14f1443404SH. Nikolaus Schaller * Copyright (C) 2002 MontaVista Software 15f1443404SH. Nikolaus Schaller * Copyright (C) 2004 Texas Instruments 16f1443404SH. Nikolaus Schaller * Copyright (C) 2005 Dirk Behme 17f1443404SH. Nikolaus Schaller * 18f1443404SH. Nikolaus Schaller * This program is free software; you can redistribute it and/or modify 19f1443404SH. Nikolaus Schaller * it under the terms of the GNU General Public License version 2 as 20f1443404SH. Nikolaus Schaller * published by the Free Software Foundation. 21f1443404SH. Nikolaus Schaller */ 22f1443404SH. Nikolaus Schaller 23f1443404SH. Nikolaus Schaller #include <linux/module.h> 24f1443404SH. Nikolaus Schaller #include <linux/slab.h> 25f1443404SH. Nikolaus Schaller #include <linux/input.h> 26f1443404SH. Nikolaus Schaller #include <linux/interrupt.h> 27f1443404SH. Nikolaus Schaller #include <linux/i2c.h> 28f1443404SH. Nikolaus Schaller #include <linux/of_device.h> 29f1443404SH. Nikolaus Schaller #include <linux/of_gpio.h> 308fd70815SWolfram Sang #include <linux/platform_data/tsc2007.h> 31f1443404SH. Nikolaus Schaller #include "tsc2007.h" 32f1443404SH. Nikolaus Schaller 33f1443404SH. Nikolaus Schaller int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd) 34f1443404SH. Nikolaus Schaller { 35f1443404SH. Nikolaus Schaller s32 data; 36f1443404SH. Nikolaus Schaller u16 val; 37f1443404SH. Nikolaus Schaller 38f1443404SH. Nikolaus Schaller data = i2c_smbus_read_word_data(tsc->client, cmd); 39f1443404SH. Nikolaus Schaller if (data < 0) { 40f1443404SH. Nikolaus Schaller dev_err(&tsc->client->dev, "i2c io error: %d\n", data); 41f1443404SH. Nikolaus Schaller return data; 42f1443404SH. Nikolaus Schaller } 43f1443404SH. Nikolaus Schaller 44f1443404SH. Nikolaus Schaller /* The protocol and raw data format from i2c interface: 45f1443404SH. Nikolaus Schaller * S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P 46f1443404SH. Nikolaus Schaller * Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 | Dummy 4bit]. 47f1443404SH. Nikolaus Schaller */ 48f1443404SH. Nikolaus Schaller val = swab16(data) >> 4; 49f1443404SH. Nikolaus Schaller 50f1443404SH. Nikolaus Schaller dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val); 51f1443404SH. Nikolaus Schaller 52f1443404SH. Nikolaus Schaller return val; 53f1443404SH. Nikolaus Schaller } 54f1443404SH. Nikolaus Schaller 55f1443404SH. Nikolaus Schaller static void tsc2007_read_values(struct tsc2007 *tsc, struct ts_event *tc) 56f1443404SH. Nikolaus Schaller { 57f1443404SH. Nikolaus Schaller /* y- still on; turn on only y+ (and ADC) */ 58f1443404SH. Nikolaus Schaller tc->y = tsc2007_xfer(tsc, READ_Y); 59f1443404SH. Nikolaus Schaller 60f1443404SH. Nikolaus Schaller /* turn y- off, x+ on, then leave in lowpower */ 61f1443404SH. Nikolaus Schaller tc->x = tsc2007_xfer(tsc, READ_X); 62f1443404SH. Nikolaus Schaller 63f1443404SH. Nikolaus Schaller /* turn y+ off, x- on; we'll use formula #1 */ 64f1443404SH. Nikolaus Schaller tc->z1 = tsc2007_xfer(tsc, READ_Z1); 65f1443404SH. Nikolaus Schaller tc->z2 = tsc2007_xfer(tsc, READ_Z2); 66f1443404SH. Nikolaus Schaller 67f1443404SH. Nikolaus Schaller /* Prepare for next touch reading - power down ADC, enable PENIRQ */ 68f1443404SH. Nikolaus Schaller tsc2007_xfer(tsc, PWRDOWN); 69f1443404SH. Nikolaus Schaller } 70f1443404SH. Nikolaus Schaller 71deec586dSH. Nikolaus Schaller u32 tsc2007_calculate_resistance(struct tsc2007 *tsc, struct ts_event *tc) 72f1443404SH. Nikolaus Schaller { 73f1443404SH. Nikolaus Schaller u32 rt = 0; 74f1443404SH. Nikolaus Schaller 75f1443404SH. Nikolaus Schaller /* range filtering */ 76f1443404SH. Nikolaus Schaller if (tc->x == MAX_12BIT) 77f1443404SH. Nikolaus Schaller tc->x = 0; 78f1443404SH. Nikolaus Schaller 79f1443404SH. Nikolaus Schaller if (likely(tc->x && tc->z1)) { 80deec586dSH. Nikolaus Schaller /* compute touch resistance using equation #1 */ 81f1443404SH. Nikolaus Schaller rt = tc->z2 - tc->z1; 82f1443404SH. Nikolaus Schaller rt *= tc->x; 83f1443404SH. Nikolaus Schaller rt *= tsc->x_plate_ohms; 84f1443404SH. Nikolaus Schaller rt /= tc->z1; 85f1443404SH. Nikolaus Schaller rt = (rt + 2047) >> 12; 86f1443404SH. Nikolaus Schaller } 87f1443404SH. Nikolaus Schaller 88f1443404SH. Nikolaus Schaller return rt; 89f1443404SH. Nikolaus Schaller } 90f1443404SH. Nikolaus Schaller 91f1443404SH. Nikolaus Schaller bool tsc2007_is_pen_down(struct tsc2007 *ts) 92f1443404SH. Nikolaus Schaller { 93f1443404SH. Nikolaus Schaller /* 94f1443404SH. Nikolaus Schaller * NOTE: We can't rely on the pressure to determine the pen down 95f1443404SH. Nikolaus Schaller * state, even though this controller has a pressure sensor. 96f1443404SH. Nikolaus Schaller * The pressure value can fluctuate for quite a while after 97f1443404SH. Nikolaus Schaller * lifting the pen and in some cases may not even settle at the 98f1443404SH. Nikolaus Schaller * expected value. 99f1443404SH. Nikolaus Schaller * 100f1443404SH. Nikolaus Schaller * The only safe way to check for the pen up condition is in the 101f1443404SH. Nikolaus Schaller * work function by reading the pen signal state (it's a GPIO 102f1443404SH. Nikolaus Schaller * and IRQ). Unfortunately such callback is not always available, 103f1443404SH. Nikolaus Schaller * in that case we assume that the pen is down and expect caller 104f1443404SH. Nikolaus Schaller * to fall back on the pressure reading. 105f1443404SH. Nikolaus Schaller */ 106f1443404SH. Nikolaus Schaller 107f1443404SH. Nikolaus Schaller if (!ts->get_pendown_state) 108f1443404SH. Nikolaus Schaller return true; 109f1443404SH. Nikolaus Schaller 110f1443404SH. Nikolaus Schaller return ts->get_pendown_state(&ts->client->dev); 111f1443404SH. Nikolaus Schaller } 112f1443404SH. Nikolaus Schaller 113f1443404SH. Nikolaus Schaller static irqreturn_t tsc2007_soft_irq(int irq, void *handle) 114f1443404SH. Nikolaus Schaller { 115f1443404SH. Nikolaus Schaller struct tsc2007 *ts = handle; 116f1443404SH. Nikolaus Schaller struct input_dev *input = ts->input; 117f1443404SH. Nikolaus Schaller struct ts_event tc; 118f1443404SH. Nikolaus Schaller u32 rt; 119f1443404SH. Nikolaus Schaller 120f1443404SH. Nikolaus Schaller while (!ts->stopped && tsc2007_is_pen_down(ts)) { 121f1443404SH. Nikolaus Schaller 122f1443404SH. Nikolaus Schaller /* pen is down, continue with the measurement */ 123f1443404SH. Nikolaus Schaller 124f1443404SH. Nikolaus Schaller mutex_lock(&ts->mlock); 125f1443404SH. Nikolaus Schaller tsc2007_read_values(ts, &tc); 126f1443404SH. Nikolaus Schaller mutex_unlock(&ts->mlock); 127f1443404SH. Nikolaus Schaller 128deec586dSH. Nikolaus Schaller rt = tsc2007_calculate_resistance(ts, &tc); 129f1443404SH. Nikolaus Schaller 130f1443404SH. Nikolaus Schaller if (!rt && !ts->get_pendown_state) { 131f1443404SH. Nikolaus Schaller /* 132f1443404SH. Nikolaus Schaller * If pressure reported is 0 and we don't have 133f1443404SH. Nikolaus Schaller * callback to check pendown state, we have to 134f1443404SH. Nikolaus Schaller * assume that pen was lifted up. 135f1443404SH. Nikolaus Schaller */ 136f1443404SH. Nikolaus Schaller break; 137f1443404SH. Nikolaus Schaller } 138f1443404SH. Nikolaus Schaller 139f1443404SH. Nikolaus Schaller if (rt <= ts->max_rt) { 140f1443404SH. Nikolaus Schaller dev_dbg(&ts->client->dev, 141deec586dSH. Nikolaus Schaller "DOWN point(%4d,%4d), resistance (%4u)\n", 142f1443404SH. Nikolaus Schaller tc.x, tc.y, rt); 143f1443404SH. Nikolaus Schaller 144db4572ffSH. Nikolaus Schaller rt = ts->max_rt - rt; 145db4572ffSH. Nikolaus Schaller 146f1443404SH. Nikolaus Schaller input_report_key(input, BTN_TOUCH, 1); 147f1443404SH. Nikolaus Schaller input_report_abs(input, ABS_X, tc.x); 148f1443404SH. Nikolaus Schaller input_report_abs(input, ABS_Y, tc.y); 149f1443404SH. Nikolaus Schaller input_report_abs(input, ABS_PRESSURE, rt); 150f1443404SH. Nikolaus Schaller 151f1443404SH. Nikolaus Schaller input_sync(input); 152f1443404SH. Nikolaus Schaller 153f1443404SH. Nikolaus Schaller } else { 154f1443404SH. Nikolaus Schaller /* 155f1443404SH. Nikolaus Schaller * Sample found inconsistent by debouncing or pressure is 156f1443404SH. Nikolaus Schaller * beyond the maximum. Don't report it to user space, 157f1443404SH. Nikolaus Schaller * repeat at least once more the measurement. 158f1443404SH. Nikolaus Schaller */ 159f1443404SH. Nikolaus Schaller dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt); 160f1443404SH. Nikolaus Schaller } 161f1443404SH. Nikolaus Schaller 162f1443404SH. Nikolaus Schaller wait_event_timeout(ts->wait, ts->stopped, ts->poll_period); 163f1443404SH. Nikolaus Schaller } 164f1443404SH. Nikolaus Schaller 165f1443404SH. Nikolaus Schaller dev_dbg(&ts->client->dev, "UP\n"); 166f1443404SH. Nikolaus Schaller 167f1443404SH. Nikolaus Schaller input_report_key(input, BTN_TOUCH, 0); 168f1443404SH. Nikolaus Schaller input_report_abs(input, ABS_PRESSURE, 0); 169f1443404SH. Nikolaus Schaller input_sync(input); 170f1443404SH. Nikolaus Schaller 171f1443404SH. Nikolaus Schaller if (ts->clear_penirq) 172f1443404SH. Nikolaus Schaller ts->clear_penirq(); 173f1443404SH. Nikolaus Schaller 174f1443404SH. Nikolaus Schaller return IRQ_HANDLED; 175f1443404SH. Nikolaus Schaller } 176f1443404SH. Nikolaus Schaller 177f1443404SH. Nikolaus Schaller static irqreturn_t tsc2007_hard_irq(int irq, void *handle) 178f1443404SH. Nikolaus Schaller { 179f1443404SH. Nikolaus Schaller struct tsc2007 *ts = handle; 180f1443404SH. Nikolaus Schaller 181f1443404SH. Nikolaus Schaller if (tsc2007_is_pen_down(ts)) 182f1443404SH. Nikolaus Schaller return IRQ_WAKE_THREAD; 183f1443404SH. Nikolaus Schaller 184f1443404SH. Nikolaus Schaller if (ts->clear_penirq) 185f1443404SH. Nikolaus Schaller ts->clear_penirq(); 186f1443404SH. Nikolaus Schaller 187f1443404SH. Nikolaus Schaller return IRQ_HANDLED; 188f1443404SH. Nikolaus Schaller } 189f1443404SH. Nikolaus Schaller 190f1443404SH. Nikolaus Schaller static void tsc2007_stop(struct tsc2007 *ts) 191f1443404SH. Nikolaus Schaller { 192f1443404SH. Nikolaus Schaller ts->stopped = true; 193f1443404SH. Nikolaus Schaller mb(); 194f1443404SH. Nikolaus Schaller wake_up(&ts->wait); 195f1443404SH. Nikolaus Schaller 196f1443404SH. Nikolaus Schaller disable_irq(ts->irq); 197f1443404SH. Nikolaus Schaller } 198f1443404SH. Nikolaus Schaller 199f1443404SH. Nikolaus Schaller static int tsc2007_open(struct input_dev *input_dev) 200f1443404SH. Nikolaus Schaller { 201f1443404SH. Nikolaus Schaller struct tsc2007 *ts = input_get_drvdata(input_dev); 202f1443404SH. Nikolaus Schaller int err; 203f1443404SH. Nikolaus Schaller 204f1443404SH. Nikolaus Schaller ts->stopped = false; 205f1443404SH. Nikolaus Schaller mb(); 206f1443404SH. Nikolaus Schaller 207f1443404SH. Nikolaus Schaller enable_irq(ts->irq); 208f1443404SH. Nikolaus Schaller 209f1443404SH. Nikolaus Schaller /* Prepare for touch readings - power down ADC and enable PENIRQ */ 210f1443404SH. Nikolaus Schaller err = tsc2007_xfer(ts, PWRDOWN); 211f1443404SH. Nikolaus Schaller if (err < 0) { 212f1443404SH. Nikolaus Schaller tsc2007_stop(ts); 213f1443404SH. Nikolaus Schaller return err; 214f1443404SH. Nikolaus Schaller } 215f1443404SH. Nikolaus Schaller 216f1443404SH. Nikolaus Schaller return 0; 217f1443404SH. Nikolaus Schaller } 218f1443404SH. Nikolaus Schaller 219f1443404SH. Nikolaus Schaller static void tsc2007_close(struct input_dev *input_dev) 220f1443404SH. Nikolaus Schaller { 221f1443404SH. Nikolaus Schaller struct tsc2007 *ts = input_get_drvdata(input_dev); 222f1443404SH. Nikolaus Schaller 223f1443404SH. Nikolaus Schaller tsc2007_stop(ts); 224f1443404SH. Nikolaus Schaller } 225f1443404SH. Nikolaus Schaller 226f1443404SH. Nikolaus Schaller #ifdef CONFIG_OF 227f1443404SH. Nikolaus Schaller static int tsc2007_get_pendown_state_gpio(struct device *dev) 228f1443404SH. Nikolaus Schaller { 229f1443404SH. Nikolaus Schaller struct i2c_client *client = to_i2c_client(dev); 230f1443404SH. Nikolaus Schaller struct tsc2007 *ts = i2c_get_clientdata(client); 231f1443404SH. Nikolaus Schaller 232f1443404SH. Nikolaus Schaller return !gpio_get_value(ts->gpio); 233f1443404SH. Nikolaus Schaller } 234f1443404SH. Nikolaus Schaller 235f1443404SH. Nikolaus Schaller static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts) 236f1443404SH. Nikolaus Schaller { 237f1443404SH. Nikolaus Schaller struct device_node *np = client->dev.of_node; 238f1443404SH. Nikolaus Schaller u32 val32; 239f1443404SH. Nikolaus Schaller u64 val64; 240f1443404SH. Nikolaus Schaller 241f1443404SH. Nikolaus Schaller if (!np) { 242f1443404SH. Nikolaus Schaller dev_err(&client->dev, "missing device tree data\n"); 243f1443404SH. Nikolaus Schaller return -EINVAL; 244f1443404SH. Nikolaus Schaller } 245f1443404SH. Nikolaus Schaller 246f1443404SH. Nikolaus Schaller if (!of_property_read_u32(np, "ti,max-rt", &val32)) 247f1443404SH. Nikolaus Schaller ts->max_rt = val32; 248f1443404SH. Nikolaus Schaller else 249f1443404SH. Nikolaus Schaller ts->max_rt = MAX_12BIT; 250f1443404SH. Nikolaus Schaller 251f1443404SH. Nikolaus Schaller if (!of_property_read_u32(np, "ti,fuzzx", &val32)) 252f1443404SH. Nikolaus Schaller ts->fuzzx = val32; 253f1443404SH. Nikolaus Schaller 254f1443404SH. Nikolaus Schaller if (!of_property_read_u32(np, "ti,fuzzy", &val32)) 255f1443404SH. Nikolaus Schaller ts->fuzzy = val32; 256f1443404SH. Nikolaus Schaller 257f1443404SH. Nikolaus Schaller if (!of_property_read_u32(np, "ti,fuzzz", &val32)) 258f1443404SH. Nikolaus Schaller ts->fuzzz = val32; 259f1443404SH. Nikolaus Schaller 260f1443404SH. Nikolaus Schaller if (!of_property_read_u64(np, "ti,poll-period", &val64)) 261f1443404SH. Nikolaus Schaller ts->poll_period = msecs_to_jiffies(val64); 262f1443404SH. Nikolaus Schaller else 263f1443404SH. Nikolaus Schaller ts->poll_period = msecs_to_jiffies(1); 264f1443404SH. Nikolaus Schaller 265f1443404SH. Nikolaus Schaller if (!of_property_read_u32(np, "ti,x-plate-ohms", &val32)) { 266f1443404SH. Nikolaus Schaller ts->x_plate_ohms = val32; 267f1443404SH. Nikolaus Schaller } else { 268f1443404SH. Nikolaus Schaller dev_err(&client->dev, "missing ti,x-plate-ohms devicetree property."); 269f1443404SH. Nikolaus Schaller return -EINVAL; 270f1443404SH. Nikolaus Schaller } 271f1443404SH. Nikolaus Schaller 272f1443404SH. Nikolaus Schaller ts->gpio = of_get_gpio(np, 0); 273f1443404SH. Nikolaus Schaller if (gpio_is_valid(ts->gpio)) 274f1443404SH. Nikolaus Schaller ts->get_pendown_state = tsc2007_get_pendown_state_gpio; 275f1443404SH. Nikolaus Schaller else 276f1443404SH. Nikolaus Schaller dev_warn(&client->dev, 277f1443404SH. Nikolaus Schaller "GPIO not specified in DT (of_get_gpio returned %d)\n", 278f1443404SH. Nikolaus Schaller ts->gpio); 279f1443404SH. Nikolaus Schaller 280f1443404SH. Nikolaus Schaller return 0; 281f1443404SH. Nikolaus Schaller } 282f1443404SH. Nikolaus Schaller #else 283f1443404SH. Nikolaus Schaller static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts) 284f1443404SH. Nikolaus Schaller { 285f1443404SH. Nikolaus Schaller dev_err(&client->dev, "platform data is required!\n"); 286f1443404SH. Nikolaus Schaller return -EINVAL; 287f1443404SH. Nikolaus Schaller } 288f1443404SH. Nikolaus Schaller #endif 289f1443404SH. Nikolaus Schaller 290f1443404SH. Nikolaus Schaller static int tsc2007_probe_pdev(struct i2c_client *client, struct tsc2007 *ts, 291f1443404SH. Nikolaus Schaller const struct tsc2007_platform_data *pdata, 292f1443404SH. Nikolaus Schaller const struct i2c_device_id *id) 293f1443404SH. Nikolaus Schaller { 294f1443404SH. Nikolaus Schaller ts->model = pdata->model; 295f1443404SH. Nikolaus Schaller ts->x_plate_ohms = pdata->x_plate_ohms; 296f1443404SH. Nikolaus Schaller ts->max_rt = pdata->max_rt ? : MAX_12BIT; 297f1443404SH. Nikolaus Schaller ts->poll_period = msecs_to_jiffies(pdata->poll_period ? : 1); 298f1443404SH. Nikolaus Schaller ts->get_pendown_state = pdata->get_pendown_state; 299f1443404SH. Nikolaus Schaller ts->clear_penirq = pdata->clear_penirq; 300f1443404SH. Nikolaus Schaller ts->fuzzx = pdata->fuzzx; 301f1443404SH. Nikolaus Schaller ts->fuzzy = pdata->fuzzy; 302f1443404SH. Nikolaus Schaller ts->fuzzz = pdata->fuzzz; 303f1443404SH. Nikolaus Schaller 304f1443404SH. Nikolaus Schaller if (pdata->x_plate_ohms == 0) { 305f1443404SH. Nikolaus Schaller dev_err(&client->dev, "x_plate_ohms is not set up in platform data"); 306f1443404SH. Nikolaus Schaller return -EINVAL; 307f1443404SH. Nikolaus Schaller } 308f1443404SH. Nikolaus Schaller 309f1443404SH. Nikolaus Schaller return 0; 310f1443404SH. Nikolaus Schaller } 311f1443404SH. Nikolaus Schaller 312f1443404SH. Nikolaus Schaller static void tsc2007_call_exit_platform_hw(void *data) 313f1443404SH. Nikolaus Schaller { 314f1443404SH. Nikolaus Schaller struct device *dev = data; 315f1443404SH. Nikolaus Schaller const struct tsc2007_platform_data *pdata = dev_get_platdata(dev); 316f1443404SH. Nikolaus Schaller 317f1443404SH. Nikolaus Schaller pdata->exit_platform_hw(); 318f1443404SH. Nikolaus Schaller } 319f1443404SH. Nikolaus Schaller 320f1443404SH. Nikolaus Schaller static int tsc2007_probe(struct i2c_client *client, 321f1443404SH. Nikolaus Schaller const struct i2c_device_id *id) 322f1443404SH. Nikolaus Schaller { 323f1443404SH. Nikolaus Schaller const struct tsc2007_platform_data *pdata = 324f1443404SH. Nikolaus Schaller dev_get_platdata(&client->dev); 325f1443404SH. Nikolaus Schaller struct tsc2007 *ts; 326f1443404SH. Nikolaus Schaller struct input_dev *input_dev; 327f1443404SH. Nikolaus Schaller int err; 328f1443404SH. Nikolaus Schaller 329f1443404SH. Nikolaus Schaller if (!i2c_check_functionality(client->adapter, 330f1443404SH. Nikolaus Schaller I2C_FUNC_SMBUS_READ_WORD_DATA)) 331f1443404SH. Nikolaus Schaller return -EIO; 332f1443404SH. Nikolaus Schaller 333f1443404SH. Nikolaus Schaller ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL); 334f1443404SH. Nikolaus Schaller if (!ts) 335f1443404SH. Nikolaus Schaller return -ENOMEM; 336f1443404SH. Nikolaus Schaller 337f1443404SH. Nikolaus Schaller if (pdata) 338f1443404SH. Nikolaus Schaller err = tsc2007_probe_pdev(client, ts, pdata, id); 339f1443404SH. Nikolaus Schaller else 340f1443404SH. Nikolaus Schaller err = tsc2007_probe_dt(client, ts); 341f1443404SH. Nikolaus Schaller if (err) 342f1443404SH. Nikolaus Schaller return err; 343f1443404SH. Nikolaus Schaller 344f1443404SH. Nikolaus Schaller input_dev = devm_input_allocate_device(&client->dev); 345f1443404SH. Nikolaus Schaller if (!input_dev) 346f1443404SH. Nikolaus Schaller return -ENOMEM; 347f1443404SH. Nikolaus Schaller 348f1443404SH. Nikolaus Schaller i2c_set_clientdata(client, ts); 349f1443404SH. Nikolaus Schaller 350f1443404SH. Nikolaus Schaller ts->client = client; 351f1443404SH. Nikolaus Schaller ts->irq = client->irq; 352f1443404SH. Nikolaus Schaller ts->input = input_dev; 353f1443404SH. Nikolaus Schaller 354f1443404SH. Nikolaus Schaller init_waitqueue_head(&ts->wait); 355f1443404SH. Nikolaus Schaller mutex_init(&ts->mlock); 356f1443404SH. Nikolaus Schaller 357f1443404SH. Nikolaus Schaller snprintf(ts->phys, sizeof(ts->phys), 358f1443404SH. Nikolaus Schaller "%s/input0", dev_name(&client->dev)); 359f1443404SH. Nikolaus Schaller 360f1443404SH. Nikolaus Schaller input_dev->name = "TSC2007 Touchscreen"; 361f1443404SH. Nikolaus Schaller input_dev->phys = ts->phys; 362f1443404SH. Nikolaus Schaller input_dev->id.bustype = BUS_I2C; 363f1443404SH. Nikolaus Schaller 364f1443404SH. Nikolaus Schaller input_dev->open = tsc2007_open; 365f1443404SH. Nikolaus Schaller input_dev->close = tsc2007_close; 366f1443404SH. Nikolaus Schaller 367f1443404SH. Nikolaus Schaller input_set_drvdata(input_dev, ts); 368f1443404SH. Nikolaus Schaller 369c61ebe83SDmitry Torokhov input_set_capability(input_dev, EV_KEY, BTN_TOUCH); 370f1443404SH. Nikolaus Schaller 371f1443404SH. Nikolaus Schaller input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzx, 0); 372f1443404SH. Nikolaus Schaller input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0); 373f1443404SH. Nikolaus Schaller input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 374f1443404SH. Nikolaus Schaller ts->fuzzz, 0); 375f1443404SH. Nikolaus Schaller 376f1443404SH. Nikolaus Schaller if (pdata) { 377f1443404SH. Nikolaus Schaller if (pdata->exit_platform_hw) { 378f1443404SH. Nikolaus Schaller err = devm_add_action(&client->dev, 379f1443404SH. Nikolaus Schaller tsc2007_call_exit_platform_hw, 380f1443404SH. Nikolaus Schaller &client->dev); 381f1443404SH. Nikolaus Schaller if (err) { 382f1443404SH. Nikolaus Schaller dev_err(&client->dev, 383f1443404SH. Nikolaus Schaller "Failed to register exit_platform_hw action, %d\n", 384f1443404SH. Nikolaus Schaller err); 385f1443404SH. Nikolaus Schaller return err; 386f1443404SH. Nikolaus Schaller } 387f1443404SH. Nikolaus Schaller } 388f1443404SH. Nikolaus Schaller 389f1443404SH. Nikolaus Schaller if (pdata->init_platform_hw) 390f1443404SH. Nikolaus Schaller pdata->init_platform_hw(); 391f1443404SH. Nikolaus Schaller } 392f1443404SH. Nikolaus Schaller 393f1443404SH. Nikolaus Schaller err = devm_request_threaded_irq(&client->dev, ts->irq, 394f1443404SH. Nikolaus Schaller tsc2007_hard_irq, tsc2007_soft_irq, 395f1443404SH. Nikolaus Schaller IRQF_ONESHOT, 396f1443404SH. Nikolaus Schaller client->dev.driver->name, ts); 397f1443404SH. Nikolaus Schaller if (err) { 398f1443404SH. Nikolaus Schaller dev_err(&client->dev, "Failed to request irq %d: %d\n", 399f1443404SH. Nikolaus Schaller ts->irq, err); 400f1443404SH. Nikolaus Schaller return err; 401f1443404SH. Nikolaus Schaller } 402f1443404SH. Nikolaus Schaller 403f1443404SH. Nikolaus Schaller tsc2007_stop(ts); 404f1443404SH. Nikolaus Schaller 405f1443404SH. Nikolaus Schaller /* power down the chip (TSC2007_SETUP does not ACK on I2C) */ 406f1443404SH. Nikolaus Schaller err = tsc2007_xfer(ts, PWRDOWN); 407f1443404SH. Nikolaus Schaller if (err < 0) { 408f1443404SH. Nikolaus Schaller dev_err(&client->dev, 409f1443404SH. Nikolaus Schaller "Failed to setup chip: %d\n", err); 410f1443404SH. Nikolaus Schaller return err; /* chip does not respond */ 411f1443404SH. Nikolaus Schaller } 412f1443404SH. Nikolaus Schaller 413f1443404SH. Nikolaus Schaller err = input_register_device(input_dev); 414f1443404SH. Nikolaus Schaller if (err) { 415f1443404SH. Nikolaus Schaller dev_err(&client->dev, 416f1443404SH. Nikolaus Schaller "Failed to register input device: %d\n", err); 417f1443404SH. Nikolaus Schaller return err; 418f1443404SH. Nikolaus Schaller } 419f1443404SH. Nikolaus Schaller 420f1443404SH. Nikolaus Schaller err = tsc2007_iio_configure(ts); 421f1443404SH. Nikolaus Schaller if (err) { 422f1443404SH. Nikolaus Schaller dev_err(&client->dev, 423f1443404SH. Nikolaus Schaller "Failed to register with IIO: %d\n", err); 424f1443404SH. Nikolaus Schaller return err; 425f1443404SH. Nikolaus Schaller } 426f1443404SH. Nikolaus Schaller 427f1443404SH. Nikolaus Schaller return 0; 428f1443404SH. Nikolaus Schaller } 429f1443404SH. Nikolaus Schaller 430f1443404SH. Nikolaus Schaller static const struct i2c_device_id tsc2007_idtable[] = { 431f1443404SH. Nikolaus Schaller { "tsc2007", 0 }, 432f1443404SH. Nikolaus Schaller { } 433f1443404SH. Nikolaus Schaller }; 434f1443404SH. Nikolaus Schaller 435f1443404SH. Nikolaus Schaller MODULE_DEVICE_TABLE(i2c, tsc2007_idtable); 436f1443404SH. Nikolaus Schaller 437f1443404SH. Nikolaus Schaller #ifdef CONFIG_OF 438f1443404SH. Nikolaus Schaller static const struct of_device_id tsc2007_of_match[] = { 439f1443404SH. Nikolaus Schaller { .compatible = "ti,tsc2007" }, 440f1443404SH. Nikolaus Schaller { /* sentinel */ } 441f1443404SH. Nikolaus Schaller }; 442f1443404SH. Nikolaus Schaller MODULE_DEVICE_TABLE(of, tsc2007_of_match); 443f1443404SH. Nikolaus Schaller #endif 444f1443404SH. Nikolaus Schaller 445f1443404SH. Nikolaus Schaller static struct i2c_driver tsc2007_driver = { 446f1443404SH. Nikolaus Schaller .driver = { 447f1443404SH. Nikolaus Schaller .name = "tsc2007", 448f1443404SH. Nikolaus Schaller .of_match_table = of_match_ptr(tsc2007_of_match), 449f1443404SH. Nikolaus Schaller }, 450f1443404SH. Nikolaus Schaller .id_table = tsc2007_idtable, 451f1443404SH. Nikolaus Schaller .probe = tsc2007_probe, 452f1443404SH. Nikolaus Schaller }; 453f1443404SH. Nikolaus Schaller 454f1443404SH. Nikolaus Schaller module_i2c_driver(tsc2007_driver); 455f1443404SH. Nikolaus Schaller 456f1443404SH. Nikolaus Schaller MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>"); 457f1443404SH. Nikolaus Schaller MODULE_DESCRIPTION("TSC2007 TouchScreen Driver"); 458f1443404SH. Nikolaus Schaller MODULE_LICENSE("GPL"); 459