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> 22*cee451c9SAndy 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> 26f1443404SH. Nikolaus Schaller #include <linux/of_device.h> 278fd70815SWolfram Sang #include <linux/platform_data/tsc2007.h> 28f1443404SH. Nikolaus Schaller #include "tsc2007.h" 29f1443404SH. Nikolaus Schaller 30f1443404SH. Nikolaus Schaller int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd) 31f1443404SH. Nikolaus Schaller { 32f1443404SH. Nikolaus Schaller s32 data; 33f1443404SH. Nikolaus Schaller u16 val; 34f1443404SH. Nikolaus Schaller 35f1443404SH. Nikolaus Schaller data = i2c_smbus_read_word_data(tsc->client, cmd); 36f1443404SH. Nikolaus Schaller if (data < 0) { 37f1443404SH. Nikolaus Schaller dev_err(&tsc->client->dev, "i2c io error: %d\n", data); 38f1443404SH. Nikolaus Schaller return data; 39f1443404SH. Nikolaus Schaller } 40f1443404SH. Nikolaus Schaller 41f1443404SH. Nikolaus Schaller /* The protocol and raw data format from i2c interface: 42f1443404SH. Nikolaus Schaller * S Addr Wr [A] Comm [A] S Addr Rd [A] [DataLow] A [DataHigh] NA P 43f1443404SH. Nikolaus Schaller * Where DataLow has [D11-D4], DataHigh has [D3-D0 << 4 | Dummy 4bit]. 44f1443404SH. Nikolaus Schaller */ 45f1443404SH. Nikolaus Schaller val = swab16(data) >> 4; 46f1443404SH. Nikolaus Schaller 47f1443404SH. Nikolaus Schaller dev_dbg(&tsc->client->dev, "data: 0x%x, val: 0x%x\n", data, val); 48f1443404SH. Nikolaus Schaller 49f1443404SH. Nikolaus Schaller return val; 50f1443404SH. Nikolaus Schaller } 51f1443404SH. Nikolaus Schaller 52f1443404SH. Nikolaus Schaller static void tsc2007_read_values(struct tsc2007 *tsc, struct ts_event *tc) 53f1443404SH. Nikolaus Schaller { 54f1443404SH. Nikolaus Schaller /* y- still on; turn on only y+ (and ADC) */ 55f1443404SH. Nikolaus Schaller tc->y = tsc2007_xfer(tsc, READ_Y); 56f1443404SH. Nikolaus Schaller 57f1443404SH. Nikolaus Schaller /* turn y- off, x+ on, then leave in lowpower */ 58f1443404SH. Nikolaus Schaller tc->x = tsc2007_xfer(tsc, READ_X); 59f1443404SH. Nikolaus Schaller 60f1443404SH. Nikolaus Schaller /* turn y+ off, x- on; we'll use formula #1 */ 61f1443404SH. Nikolaus Schaller tc->z1 = tsc2007_xfer(tsc, READ_Z1); 62f1443404SH. Nikolaus Schaller tc->z2 = tsc2007_xfer(tsc, READ_Z2); 63f1443404SH. Nikolaus Schaller 64f1443404SH. Nikolaus Schaller /* Prepare for next touch reading - power down ADC, enable PENIRQ */ 65f1443404SH. Nikolaus Schaller tsc2007_xfer(tsc, PWRDOWN); 66f1443404SH. Nikolaus Schaller } 67f1443404SH. Nikolaus Schaller 68deec586dSH. Nikolaus Schaller u32 tsc2007_calculate_resistance(struct tsc2007 *tsc, struct ts_event *tc) 69f1443404SH. Nikolaus Schaller { 70f1443404SH. Nikolaus Schaller u32 rt = 0; 71f1443404SH. Nikolaus Schaller 72f1443404SH. Nikolaus Schaller /* range filtering */ 73f1443404SH. Nikolaus Schaller if (tc->x == MAX_12BIT) 74f1443404SH. Nikolaus Schaller tc->x = 0; 75f1443404SH. Nikolaus Schaller 76f1443404SH. Nikolaus Schaller if (likely(tc->x && tc->z1)) { 77deec586dSH. Nikolaus Schaller /* compute touch resistance using equation #1 */ 78f1443404SH. Nikolaus Schaller rt = tc->z2 - tc->z1; 79f1443404SH. Nikolaus Schaller rt *= tc->x; 80f1443404SH. Nikolaus Schaller rt *= tsc->x_plate_ohms; 81f1443404SH. Nikolaus Schaller rt /= tc->z1; 82f1443404SH. Nikolaus Schaller rt = (rt + 2047) >> 12; 83f1443404SH. Nikolaus Schaller } 84f1443404SH. Nikolaus Schaller 85f1443404SH. Nikolaus Schaller return rt; 86f1443404SH. Nikolaus Schaller } 87f1443404SH. Nikolaus Schaller 88f1443404SH. Nikolaus Schaller bool tsc2007_is_pen_down(struct tsc2007 *ts) 89f1443404SH. Nikolaus Schaller { 90f1443404SH. Nikolaus Schaller /* 91f1443404SH. Nikolaus Schaller * NOTE: We can't rely on the pressure to determine the pen down 92f1443404SH. Nikolaus Schaller * state, even though this controller has a pressure sensor. 93f1443404SH. Nikolaus Schaller * The pressure value can fluctuate for quite a while after 94f1443404SH. Nikolaus Schaller * lifting the pen and in some cases may not even settle at the 95f1443404SH. Nikolaus Schaller * expected value. 96f1443404SH. Nikolaus Schaller * 97f1443404SH. Nikolaus Schaller * The only safe way to check for the pen up condition is in the 98f1443404SH. Nikolaus Schaller * work function by reading the pen signal state (it's a GPIO 99f1443404SH. Nikolaus Schaller * and IRQ). Unfortunately such callback is not always available, 100f1443404SH. Nikolaus Schaller * in that case we assume that the pen is down and expect caller 101f1443404SH. Nikolaus Schaller * to fall back on the pressure reading. 102f1443404SH. Nikolaus Schaller */ 103f1443404SH. Nikolaus Schaller 104f1443404SH. Nikolaus Schaller if (!ts->get_pendown_state) 105f1443404SH. Nikolaus Schaller return true; 106f1443404SH. Nikolaus Schaller 107f1443404SH. Nikolaus Schaller return ts->get_pendown_state(&ts->client->dev); 108f1443404SH. Nikolaus Schaller } 109f1443404SH. Nikolaus Schaller 110f1443404SH. Nikolaus Schaller static irqreturn_t tsc2007_soft_irq(int irq, void *handle) 111f1443404SH. Nikolaus Schaller { 112f1443404SH. Nikolaus Schaller struct tsc2007 *ts = handle; 113f1443404SH. Nikolaus Schaller struct input_dev *input = ts->input; 114f1443404SH. Nikolaus Schaller struct ts_event tc; 115f1443404SH. Nikolaus Schaller u32 rt; 116f1443404SH. Nikolaus Schaller 117f1443404SH. Nikolaus Schaller while (!ts->stopped && tsc2007_is_pen_down(ts)) { 118f1443404SH. Nikolaus Schaller 119f1443404SH. Nikolaus Schaller /* pen is down, continue with the measurement */ 120f1443404SH. Nikolaus Schaller 121f1443404SH. Nikolaus Schaller mutex_lock(&ts->mlock); 122f1443404SH. Nikolaus Schaller tsc2007_read_values(ts, &tc); 123f1443404SH. Nikolaus Schaller mutex_unlock(&ts->mlock); 124f1443404SH. Nikolaus Schaller 125deec586dSH. Nikolaus Schaller rt = tsc2007_calculate_resistance(ts, &tc); 126f1443404SH. Nikolaus Schaller 127f1443404SH. Nikolaus Schaller if (!rt && !ts->get_pendown_state) { 128f1443404SH. Nikolaus Schaller /* 129f1443404SH. Nikolaus Schaller * If pressure reported is 0 and we don't have 130f1443404SH. Nikolaus Schaller * callback to check pendown state, we have to 131f1443404SH. Nikolaus Schaller * assume that pen was lifted up. 132f1443404SH. Nikolaus Schaller */ 133f1443404SH. Nikolaus Schaller break; 134f1443404SH. Nikolaus Schaller } 135f1443404SH. Nikolaus Schaller 136f1443404SH. Nikolaus Schaller if (rt <= ts->max_rt) { 137f1443404SH. Nikolaus Schaller dev_dbg(&ts->client->dev, 138deec586dSH. Nikolaus Schaller "DOWN point(%4d,%4d), resistance (%4u)\n", 139f1443404SH. Nikolaus Schaller tc.x, tc.y, rt); 140f1443404SH. Nikolaus Schaller 141db4572ffSH. Nikolaus Schaller rt = ts->max_rt - rt; 142db4572ffSH. Nikolaus Schaller 143f1443404SH. Nikolaus Schaller input_report_key(input, BTN_TOUCH, 1); 144f1443404SH. Nikolaus Schaller input_report_abs(input, ABS_X, tc.x); 145f1443404SH. Nikolaus Schaller input_report_abs(input, ABS_Y, tc.y); 146f1443404SH. Nikolaus Schaller input_report_abs(input, ABS_PRESSURE, rt); 147f1443404SH. Nikolaus Schaller 148f1443404SH. Nikolaus Schaller input_sync(input); 149f1443404SH. Nikolaus Schaller 150f1443404SH. Nikolaus Schaller } else { 151f1443404SH. Nikolaus Schaller /* 152f1443404SH. Nikolaus Schaller * Sample found inconsistent by debouncing or pressure is 153f1443404SH. Nikolaus Schaller * beyond the maximum. Don't report it to user space, 154f1443404SH. Nikolaus Schaller * repeat at least once more the measurement. 155f1443404SH. Nikolaus Schaller */ 156f1443404SH. Nikolaus Schaller dev_dbg(&ts->client->dev, "ignored pressure %d\n", rt); 157f1443404SH. Nikolaus Schaller } 158f1443404SH. Nikolaus Schaller 159f1443404SH. Nikolaus Schaller wait_event_timeout(ts->wait, ts->stopped, ts->poll_period); 160f1443404SH. Nikolaus Schaller } 161f1443404SH. Nikolaus Schaller 162f1443404SH. Nikolaus Schaller dev_dbg(&ts->client->dev, "UP\n"); 163f1443404SH. Nikolaus Schaller 164f1443404SH. Nikolaus Schaller input_report_key(input, BTN_TOUCH, 0); 165f1443404SH. Nikolaus Schaller input_report_abs(input, ABS_PRESSURE, 0); 166f1443404SH. Nikolaus Schaller input_sync(input); 167f1443404SH. Nikolaus Schaller 168f1443404SH. Nikolaus Schaller if (ts->clear_penirq) 169f1443404SH. Nikolaus Schaller ts->clear_penirq(); 170f1443404SH. Nikolaus Schaller 171f1443404SH. Nikolaus Schaller return IRQ_HANDLED; 172f1443404SH. Nikolaus Schaller } 173f1443404SH. Nikolaus Schaller 174f1443404SH. Nikolaus Schaller static irqreturn_t tsc2007_hard_irq(int irq, void *handle) 175f1443404SH. Nikolaus Schaller { 176f1443404SH. Nikolaus Schaller struct tsc2007 *ts = handle; 177f1443404SH. Nikolaus Schaller 178f1443404SH. Nikolaus Schaller if (tsc2007_is_pen_down(ts)) 179f1443404SH. Nikolaus Schaller return IRQ_WAKE_THREAD; 180f1443404SH. Nikolaus Schaller 181f1443404SH. Nikolaus Schaller if (ts->clear_penirq) 182f1443404SH. Nikolaus Schaller ts->clear_penirq(); 183f1443404SH. Nikolaus Schaller 184f1443404SH. Nikolaus Schaller return IRQ_HANDLED; 185f1443404SH. Nikolaus Schaller } 186f1443404SH. Nikolaus Schaller 187f1443404SH. Nikolaus Schaller static void tsc2007_stop(struct tsc2007 *ts) 188f1443404SH. Nikolaus Schaller { 189f1443404SH. Nikolaus Schaller ts->stopped = true; 190f1443404SH. Nikolaus Schaller mb(); 191f1443404SH. Nikolaus Schaller wake_up(&ts->wait); 192f1443404SH. Nikolaus Schaller 193f1443404SH. Nikolaus Schaller disable_irq(ts->irq); 194f1443404SH. Nikolaus Schaller } 195f1443404SH. Nikolaus Schaller 196f1443404SH. Nikolaus Schaller static int tsc2007_open(struct input_dev *input_dev) 197f1443404SH. Nikolaus Schaller { 198f1443404SH. Nikolaus Schaller struct tsc2007 *ts = input_get_drvdata(input_dev); 199f1443404SH. Nikolaus Schaller int err; 200f1443404SH. Nikolaus Schaller 201f1443404SH. Nikolaus Schaller ts->stopped = false; 202f1443404SH. Nikolaus Schaller mb(); 203f1443404SH. Nikolaus Schaller 204f1443404SH. Nikolaus Schaller enable_irq(ts->irq); 205f1443404SH. Nikolaus Schaller 206f1443404SH. Nikolaus Schaller /* Prepare for touch readings - power down ADC and enable PENIRQ */ 207f1443404SH. Nikolaus Schaller err = tsc2007_xfer(ts, PWRDOWN); 208f1443404SH. Nikolaus Schaller if (err < 0) { 209f1443404SH. Nikolaus Schaller tsc2007_stop(ts); 210f1443404SH. Nikolaus Schaller return err; 211f1443404SH. Nikolaus Schaller } 212f1443404SH. Nikolaus Schaller 213f1443404SH. Nikolaus Schaller return 0; 214f1443404SH. Nikolaus Schaller } 215f1443404SH. Nikolaus Schaller 216f1443404SH. Nikolaus Schaller static void tsc2007_close(struct input_dev *input_dev) 217f1443404SH. Nikolaus Schaller { 218f1443404SH. Nikolaus Schaller struct tsc2007 *ts = input_get_drvdata(input_dev); 219f1443404SH. Nikolaus Schaller 220f1443404SH. Nikolaus Schaller tsc2007_stop(ts); 221f1443404SH. Nikolaus Schaller } 222f1443404SH. Nikolaus Schaller 223f1443404SH. Nikolaus Schaller #ifdef CONFIG_OF 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 229*cee451c9SAndy Shevchenko return gpiod_get_value(ts->gpiod); 230f1443404SH. Nikolaus Schaller } 231f1443404SH. Nikolaus Schaller 232f1443404SH. Nikolaus Schaller static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts) 233f1443404SH. Nikolaus Schaller { 234f1443404SH. Nikolaus Schaller struct device_node *np = client->dev.of_node; 235f1443404SH. Nikolaus Schaller u32 val32; 236f1443404SH. Nikolaus Schaller u64 val64; 237f1443404SH. Nikolaus Schaller 238f1443404SH. Nikolaus Schaller if (!np) { 239f1443404SH. Nikolaus Schaller dev_err(&client->dev, "missing device tree data\n"); 240f1443404SH. Nikolaus Schaller return -EINVAL; 241f1443404SH. Nikolaus Schaller } 242f1443404SH. Nikolaus Schaller 243f1443404SH. Nikolaus Schaller if (!of_property_read_u32(np, "ti,max-rt", &val32)) 244f1443404SH. Nikolaus Schaller ts->max_rt = val32; 245f1443404SH. Nikolaus Schaller else 246f1443404SH. Nikolaus Schaller ts->max_rt = MAX_12BIT; 247f1443404SH. Nikolaus Schaller 248f1443404SH. Nikolaus Schaller if (!of_property_read_u32(np, "ti,fuzzx", &val32)) 249f1443404SH. Nikolaus Schaller ts->fuzzx = val32; 250f1443404SH. Nikolaus Schaller 251f1443404SH. Nikolaus Schaller if (!of_property_read_u32(np, "ti,fuzzy", &val32)) 252f1443404SH. Nikolaus Schaller ts->fuzzy = val32; 253f1443404SH. Nikolaus Schaller 254f1443404SH. Nikolaus Schaller if (!of_property_read_u32(np, "ti,fuzzz", &val32)) 255f1443404SH. Nikolaus Schaller ts->fuzzz = val32; 256f1443404SH. Nikolaus Schaller 257f1443404SH. Nikolaus Schaller if (!of_property_read_u64(np, "ti,poll-period", &val64)) 258f1443404SH. Nikolaus Schaller ts->poll_period = msecs_to_jiffies(val64); 259f1443404SH. Nikolaus Schaller else 260f1443404SH. Nikolaus Schaller ts->poll_period = msecs_to_jiffies(1); 261f1443404SH. Nikolaus Schaller 262f1443404SH. Nikolaus Schaller if (!of_property_read_u32(np, "ti,x-plate-ohms", &val32)) { 263f1443404SH. Nikolaus Schaller ts->x_plate_ohms = val32; 264f1443404SH. Nikolaus Schaller } else { 265f1443404SH. Nikolaus Schaller dev_err(&client->dev, "missing ti,x-plate-ohms devicetree property."); 266f1443404SH. Nikolaus Schaller return -EINVAL; 267f1443404SH. Nikolaus Schaller } 268f1443404SH. Nikolaus Schaller 269*cee451c9SAndy Shevchenko ts->gpiod = devm_gpiod_get_optional(&client->dev, NULL, GPIOD_IN); 270*cee451c9SAndy Shevchenko if (IS_ERR(ts->gpiod)) 271*cee451c9SAndy Shevchenko return PTR_ERR(ts->gpiod); 272*cee451c9SAndy Shevchenko 273*cee451c9SAndy Shevchenko if (ts->gpiod) 274f1443404SH. Nikolaus Schaller ts->get_pendown_state = tsc2007_get_pendown_state_gpio; 275f1443404SH. Nikolaus Schaller else 276*cee451c9SAndy Shevchenko dev_warn(&client->dev, "Pen down GPIO not specified in DT\n"); 277f1443404SH. Nikolaus Schaller 278f1443404SH. Nikolaus Schaller return 0; 279f1443404SH. Nikolaus Schaller } 280f1443404SH. Nikolaus Schaller #else 281f1443404SH. Nikolaus Schaller static int tsc2007_probe_dt(struct i2c_client *client, struct tsc2007 *ts) 282f1443404SH. Nikolaus Schaller { 283f1443404SH. Nikolaus Schaller dev_err(&client->dev, "platform data is required!\n"); 284f1443404SH. Nikolaus Schaller return -EINVAL; 285f1443404SH. Nikolaus Schaller } 286f1443404SH. Nikolaus Schaller #endif 287f1443404SH. Nikolaus Schaller 288f1443404SH. Nikolaus Schaller static int tsc2007_probe_pdev(struct i2c_client *client, struct tsc2007 *ts, 289f1443404SH. Nikolaus Schaller const struct tsc2007_platform_data *pdata, 290f1443404SH. Nikolaus Schaller const struct i2c_device_id *id) 291f1443404SH. Nikolaus Schaller { 292f1443404SH. Nikolaus Schaller ts->model = pdata->model; 293f1443404SH. Nikolaus Schaller ts->x_plate_ohms = pdata->x_plate_ohms; 294f1443404SH. Nikolaus Schaller ts->max_rt = pdata->max_rt ? : MAX_12BIT; 295f1443404SH. Nikolaus Schaller ts->poll_period = msecs_to_jiffies(pdata->poll_period ? : 1); 296f1443404SH. Nikolaus Schaller ts->get_pendown_state = pdata->get_pendown_state; 297f1443404SH. Nikolaus Schaller ts->clear_penirq = pdata->clear_penirq; 298f1443404SH. Nikolaus Schaller ts->fuzzx = pdata->fuzzx; 299f1443404SH. Nikolaus Schaller ts->fuzzy = pdata->fuzzy; 300f1443404SH. Nikolaus Schaller ts->fuzzz = pdata->fuzzz; 301f1443404SH. Nikolaus Schaller 302f1443404SH. Nikolaus Schaller if (pdata->x_plate_ohms == 0) { 303f1443404SH. Nikolaus Schaller dev_err(&client->dev, "x_plate_ohms is not set up in platform data"); 304f1443404SH. Nikolaus Schaller return -EINVAL; 305f1443404SH. Nikolaus Schaller } 306f1443404SH. Nikolaus Schaller 307f1443404SH. Nikolaus Schaller return 0; 308f1443404SH. Nikolaus Schaller } 309f1443404SH. Nikolaus Schaller 310f1443404SH. Nikolaus Schaller static void tsc2007_call_exit_platform_hw(void *data) 311f1443404SH. Nikolaus Schaller { 312f1443404SH. Nikolaus Schaller struct device *dev = data; 313f1443404SH. Nikolaus Schaller const struct tsc2007_platform_data *pdata = dev_get_platdata(dev); 314f1443404SH. Nikolaus Schaller 315f1443404SH. Nikolaus Schaller pdata->exit_platform_hw(); 316f1443404SH. Nikolaus Schaller } 317f1443404SH. Nikolaus Schaller 318f1443404SH. Nikolaus Schaller static int tsc2007_probe(struct i2c_client *client, 319f1443404SH. Nikolaus Schaller const struct i2c_device_id *id) 320f1443404SH. Nikolaus Schaller { 321f1443404SH. Nikolaus Schaller const struct tsc2007_platform_data *pdata = 322f1443404SH. Nikolaus Schaller dev_get_platdata(&client->dev); 323f1443404SH. Nikolaus Schaller struct tsc2007 *ts; 324f1443404SH. Nikolaus Schaller struct input_dev *input_dev; 325f1443404SH. Nikolaus Schaller int err; 326f1443404SH. Nikolaus Schaller 327f1443404SH. Nikolaus Schaller if (!i2c_check_functionality(client->adapter, 328f1443404SH. Nikolaus Schaller I2C_FUNC_SMBUS_READ_WORD_DATA)) 329f1443404SH. Nikolaus Schaller return -EIO; 330f1443404SH. Nikolaus Schaller 331f1443404SH. Nikolaus Schaller ts = devm_kzalloc(&client->dev, sizeof(struct tsc2007), GFP_KERNEL); 332f1443404SH. Nikolaus Schaller if (!ts) 333f1443404SH. Nikolaus Schaller return -ENOMEM; 334f1443404SH. Nikolaus Schaller 335f1443404SH. Nikolaus Schaller if (pdata) 336f1443404SH. Nikolaus Schaller err = tsc2007_probe_pdev(client, ts, pdata, id); 337f1443404SH. Nikolaus Schaller else 338f1443404SH. Nikolaus Schaller err = tsc2007_probe_dt(client, ts); 339f1443404SH. Nikolaus Schaller if (err) 340f1443404SH. Nikolaus Schaller return err; 341f1443404SH. Nikolaus Schaller 342f1443404SH. Nikolaus Schaller input_dev = devm_input_allocate_device(&client->dev); 343f1443404SH. Nikolaus Schaller if (!input_dev) 344f1443404SH. Nikolaus Schaller return -ENOMEM; 345f1443404SH. Nikolaus Schaller 346f1443404SH. Nikolaus Schaller i2c_set_clientdata(client, ts); 347f1443404SH. Nikolaus Schaller 348f1443404SH. Nikolaus Schaller ts->client = client; 349f1443404SH. Nikolaus Schaller ts->irq = client->irq; 350f1443404SH. Nikolaus Schaller ts->input = input_dev; 351f1443404SH. Nikolaus Schaller 352f1443404SH. Nikolaus Schaller init_waitqueue_head(&ts->wait); 353f1443404SH. Nikolaus Schaller mutex_init(&ts->mlock); 354f1443404SH. Nikolaus Schaller 355f1443404SH. Nikolaus Schaller snprintf(ts->phys, sizeof(ts->phys), 356f1443404SH. Nikolaus Schaller "%s/input0", dev_name(&client->dev)); 357f1443404SH. Nikolaus Schaller 358f1443404SH. Nikolaus Schaller input_dev->name = "TSC2007 Touchscreen"; 359f1443404SH. Nikolaus Schaller input_dev->phys = ts->phys; 360f1443404SH. Nikolaus Schaller input_dev->id.bustype = BUS_I2C; 361f1443404SH. Nikolaus Schaller 362f1443404SH. Nikolaus Schaller input_dev->open = tsc2007_open; 363f1443404SH. Nikolaus Schaller input_dev->close = tsc2007_close; 364f1443404SH. Nikolaus Schaller 365f1443404SH. Nikolaus Schaller input_set_drvdata(input_dev, ts); 366f1443404SH. Nikolaus Schaller 367c61ebe83SDmitry Torokhov input_set_capability(input_dev, EV_KEY, BTN_TOUCH); 368f1443404SH. Nikolaus Schaller 369f1443404SH. Nikolaus Schaller input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, ts->fuzzx, 0); 370f1443404SH. Nikolaus Schaller input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, ts->fuzzy, 0); 371f1443404SH. Nikolaus Schaller input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 372f1443404SH. Nikolaus Schaller ts->fuzzz, 0); 373f1443404SH. Nikolaus Schaller 374f1443404SH. Nikolaus Schaller if (pdata) { 375f1443404SH. Nikolaus Schaller if (pdata->exit_platform_hw) { 376f1443404SH. Nikolaus Schaller err = devm_add_action(&client->dev, 377f1443404SH. Nikolaus Schaller tsc2007_call_exit_platform_hw, 378f1443404SH. Nikolaus Schaller &client->dev); 379f1443404SH. Nikolaus Schaller if (err) { 380f1443404SH. Nikolaus Schaller dev_err(&client->dev, 381f1443404SH. Nikolaus Schaller "Failed to register exit_platform_hw action, %d\n", 382f1443404SH. Nikolaus Schaller err); 383f1443404SH. Nikolaus Schaller return err; 384f1443404SH. Nikolaus Schaller } 385f1443404SH. Nikolaus Schaller } 386f1443404SH. Nikolaus Schaller 387f1443404SH. Nikolaus Schaller if (pdata->init_platform_hw) 388f1443404SH. Nikolaus Schaller pdata->init_platform_hw(); 389f1443404SH. Nikolaus Schaller } 390f1443404SH. Nikolaus Schaller 391f1443404SH. Nikolaus Schaller err = devm_request_threaded_irq(&client->dev, ts->irq, 392f1443404SH. Nikolaus Schaller tsc2007_hard_irq, tsc2007_soft_irq, 393f1443404SH. Nikolaus Schaller IRQF_ONESHOT, 394f1443404SH. Nikolaus Schaller client->dev.driver->name, ts); 395f1443404SH. Nikolaus Schaller if (err) { 396f1443404SH. Nikolaus Schaller dev_err(&client->dev, "Failed to request irq %d: %d\n", 397f1443404SH. Nikolaus Schaller ts->irq, err); 398f1443404SH. Nikolaus Schaller return err; 399f1443404SH. Nikolaus Schaller } 400f1443404SH. Nikolaus Schaller 401f1443404SH. Nikolaus Schaller tsc2007_stop(ts); 402f1443404SH. Nikolaus Schaller 403f1443404SH. Nikolaus Schaller /* power down the chip (TSC2007_SETUP does not ACK on I2C) */ 404f1443404SH. Nikolaus Schaller err = tsc2007_xfer(ts, PWRDOWN); 405f1443404SH. Nikolaus Schaller if (err < 0) { 406f1443404SH. Nikolaus Schaller dev_err(&client->dev, 407f1443404SH. Nikolaus Schaller "Failed to setup chip: %d\n", err); 408f1443404SH. Nikolaus Schaller return err; /* chip does not respond */ 409f1443404SH. Nikolaus Schaller } 410f1443404SH. Nikolaus Schaller 411f1443404SH. Nikolaus Schaller err = input_register_device(input_dev); 412f1443404SH. Nikolaus Schaller if (err) { 413f1443404SH. Nikolaus Schaller dev_err(&client->dev, 414f1443404SH. Nikolaus Schaller "Failed to register input device: %d\n", err); 415f1443404SH. Nikolaus Schaller return err; 416f1443404SH. Nikolaus Schaller } 417f1443404SH. Nikolaus Schaller 418f1443404SH. Nikolaus Schaller err = tsc2007_iio_configure(ts); 419f1443404SH. Nikolaus Schaller if (err) { 420f1443404SH. Nikolaus Schaller dev_err(&client->dev, 421f1443404SH. Nikolaus Schaller "Failed to register with IIO: %d\n", err); 422f1443404SH. Nikolaus Schaller return err; 423f1443404SH. Nikolaus Schaller } 424f1443404SH. Nikolaus Schaller 425f1443404SH. Nikolaus Schaller return 0; 426f1443404SH. Nikolaus Schaller } 427f1443404SH. Nikolaus Schaller 428f1443404SH. Nikolaus Schaller static const struct i2c_device_id tsc2007_idtable[] = { 429f1443404SH. Nikolaus Schaller { "tsc2007", 0 }, 430f1443404SH. Nikolaus Schaller { } 431f1443404SH. Nikolaus Schaller }; 432f1443404SH. Nikolaus Schaller 433f1443404SH. Nikolaus Schaller MODULE_DEVICE_TABLE(i2c, tsc2007_idtable); 434f1443404SH. Nikolaus Schaller 435f1443404SH. Nikolaus Schaller #ifdef CONFIG_OF 436f1443404SH. Nikolaus Schaller static const struct of_device_id tsc2007_of_match[] = { 437f1443404SH. Nikolaus Schaller { .compatible = "ti,tsc2007" }, 438f1443404SH. Nikolaus Schaller { /* sentinel */ } 439f1443404SH. Nikolaus Schaller }; 440f1443404SH. Nikolaus Schaller MODULE_DEVICE_TABLE(of, tsc2007_of_match); 441f1443404SH. Nikolaus Schaller #endif 442f1443404SH. Nikolaus Schaller 443f1443404SH. Nikolaus Schaller static struct i2c_driver tsc2007_driver = { 444f1443404SH. Nikolaus Schaller .driver = { 445f1443404SH. Nikolaus Schaller .name = "tsc2007", 446f1443404SH. Nikolaus Schaller .of_match_table = of_match_ptr(tsc2007_of_match), 447f1443404SH. Nikolaus Schaller }, 448f1443404SH. Nikolaus Schaller .id_table = tsc2007_idtable, 449f1443404SH. Nikolaus Schaller .probe = tsc2007_probe, 450f1443404SH. Nikolaus Schaller }; 451f1443404SH. Nikolaus Schaller 452f1443404SH. Nikolaus Schaller module_i2c_driver(tsc2007_driver); 453f1443404SH. Nikolaus Schaller 454f1443404SH. Nikolaus Schaller MODULE_AUTHOR("Kwangwoo Lee <kwlee@mtekvision.com>"); 455f1443404SH. Nikolaus Schaller MODULE_DESCRIPTION("TSC2007 TouchScreen Driver"); 456f1443404SH. Nikolaus Schaller MODULE_LICENSE("GPL"); 457