cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/touchscreen/st1232.c

/*
 * ST1232 Touchscreen Controller Driver
 *
 * Copyright (C) 2010 Renesas Solutions Corp.
 *      Tony SIM <chinyeow.sim.xt@renesas.com>
 *
 * Using code from:
 *  - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
 *      Copyright (C) 2007 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/pm_qos.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/platform_data/st1232_pdata.h>


#define ST1232_TS_NAME	"st1232-ts"


#define MIN_X		0x00

#define MIN_Y		0x00

#define MAX_X		0x31f	
/* (800 - 1) */

#define MAX_Y		0x1df	
/* (480 - 1) */

#define MAX_AREA	0xff

#define MAX_FINGERS	2


struct st1232_ts_finger {
	
u16 x;
	
u16 y;
	
u8 t;
	
bool is_valid;
};


struct st1232_ts_data {
	
struct i2c_client *client;
	
struct input_dev *input_dev;
	
struct st1232_ts_finger finger[MAX_FINGERS];
	
struct dev_pm_qos_request low_latency_req;
	
int reset_gpio;
};


static int st1232_ts_read_data(struct st1232_ts_data *ts) { struct st1232_ts_finger *finger = ts->finger; struct i2c_client *client = ts->client; struct i2c_msg msg[2]; int error; u8 start_reg; u8 buf[10]; /* read touchscreen data from ST1232 */ msg[0].addr = client->addr; msg[0].flags = 0; msg[0].len = 1; msg[0].buf = &start_reg; start_reg = 0x10; msg[1].addr = ts->client->addr; msg[1].flags = I2C_M_RD; msg[1].len = sizeof(buf); msg[1].buf = buf; error = i2c_transfer(client->adapter, msg, 2); if (error < 0) return error; /* get "valid" bits */ finger[0].is_valid = buf[2] >> 7; finger[1].is_valid = buf[5] >> 7; /* get xy coordinate */ if (finger[0].is_valid) { finger[0].x = ((buf[2] & 0x0070) << 4) | buf[3]; finger[0].y = ((buf[2] & 0x0007) << 8) | buf[4]; finger[0].t = buf[8]; } if (finger[1].is_valid) { finger[1].x = ((buf[5] & 0x0070) << 4) | buf[6]; finger[1].y = ((buf[5] & 0x0007) << 8) | buf[7]; finger[1].t = buf[9]; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Tony SIM336100.00%1100.00%
Total336100.00%1100.00%


static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id) { struct st1232_ts_data *ts = dev_id; struct st1232_ts_finger *finger = ts->finger; struct input_dev *input_dev = ts->input_dev; int count = 0; int i, ret; ret = st1232_ts_read_data(ts); if (ret < 0) goto end; /* multi touch protocol */ for (i = 0; i < MAX_FINGERS; i++) { if (!finger[i].is_valid) continue; input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t); input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x); input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y); input_mt_sync(input_dev); count++; } /* SYN_MT_REPORT only if no contact */ if (!count) { input_mt_sync(input_dev); if (ts->low_latency_req.dev) { dev_pm_qos_remove_request(&ts->low_latency_req); ts->low_latency_req.dev = NULL; } } else if (!ts->low_latency_req.dev) { /* First contact, request 100 us latency. */ dev_pm_qos_add_ancestor_request(&ts->client->dev, &ts->low_latency_req, DEV_PM_QOS_RESUME_LATENCY, 100); } /* SYN_REPORT */ input_sync(input_dev); end: return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Tony SIM16373.09%133.33%
Rafael J. Wysocki6026.91%266.67%
Total223100.00%3100.00%


static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron) { if (gpio_is_valid(ts->reset_gpio)) gpio_direction_output(ts->reset_gpio, poweron); }

Contributors

PersonTokensPropCommitsCommitProp
Bastian Hecht32100.00%1100.00%
Total32100.00%1100.00%


static int st1232_ts_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct st1232_ts_data *ts; struct st1232_pdata *pdata = dev_get_platdata(&client->dev); struct input_dev *input_dev; int error; if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { dev_err(&client->dev, "need I2C_FUNC_I2C\n"); return -EIO; } if (!client->irq) { dev_err(&client->dev, "no IRQ?\n"); return -EINVAL; } ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); if (!ts) return -ENOMEM; input_dev = devm_input_allocate_device(&client->dev); if (!input_dev) return -ENOMEM; ts->client = client; ts->input_dev = input_dev; if (pdata) ts->reset_gpio = pdata->reset_gpio; else if (client->dev.of_node) ts->reset_gpio = of_get_gpio(client->dev.of_node, 0); else ts->reset_gpio = -ENODEV; if (gpio_is_valid(ts->reset_gpio)) { error = devm_gpio_request(&client->dev, ts->reset_gpio, NULL); if (error) { dev_err(&client->dev, "Unable to request GPIO pin %d.\n", ts->reset_gpio); return error; } } st1232_ts_power(ts, true); input_dev->name = "st1232-touchscreen"; input_dev->id.bustype = BUS_I2C; input_dev->dev.parent = &client->dev; __set_bit(EV_SYN, input_dev->evbit); __set_bit(EV_KEY, input_dev->evbit); __set_bit(EV_ABS, input_dev->evbit); input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0); input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0); input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0); error = devm_request_threaded_irq(&client->dev, client->irq, NULL, st1232_ts_irq_handler, IRQF_ONESHOT, client->name, ts); if (error) { dev_err(&client->dev, "Failed to register interrupt\n"); return error; } error = input_register_device(ts->input_dev); if (error) { dev_err(&client->dev, "Unable to register %s input device\n", input_dev->name); return error; } i2c_set_clientdata(client, ts); device_init_wakeup(&client->dev, 1); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Tony SIM29566.00%125.00%
Bastian Hecht11024.61%125.00%
Laurent Pinchart388.50%125.00%
Jingoo Han40.89%125.00%
Total447100.00%4100.00%


static int st1232_ts_remove(struct i2c_client *client) { struct st1232_ts_data *ts = i2c_get_clientdata(client); st1232_ts_power(ts, false); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bastian Hecht1754.84%150.00%
Tony SIM1445.16%150.00%
Total31100.00%2100.00%


static int __maybe_unused st1232_ts_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct st1232_ts_data *ts = i2c_get_clientdata(client); if (device_may_wakeup(&client->dev)) { enable_irq_wake(client->irq); } else { disable_irq(client->irq); st1232_ts_power(ts, false); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Tony SIM4969.01%133.33%
Bastian Hecht2129.58%133.33%
Jingoo Han11.41%133.33%
Total71100.00%3100.00%


static int __maybe_unused st1232_ts_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct st1232_ts_data *ts = i2c_get_clientdata(client); if (device_may_wakeup(&client->dev)) { disable_irq_wake(client->irq); } else { st1232_ts_power(ts, true); enable_irq(client->irq); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Tony SIM4969.01%133.33%
Bastian Hecht2129.58%133.33%
Jingoo Han11.41%133.33%
Total71100.00%3100.00%

static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops, st1232_ts_suspend, st1232_ts_resume); static const struct i2c_device_id st1232_ts_id[] = { { ST1232_TS_NAME, 0 }, { } }; MODULE_DEVICE_TABLE(i2c, st1232_ts_id); #ifdef CONFIG_OF static const struct of_device_id st1232_ts_dt_ids[] = { { .compatible = "sitronix,st1232", }, { } }; MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids); #endif static struct i2c_driver st1232_ts_driver = { .probe = st1232_ts_probe, .remove = st1232_ts_remove, .id_table = st1232_ts_id, .driver = { .name = ST1232_TS_NAME, .of_match_table = of_match_ptr(st1232_ts_dt_ids), .pm = &st1232_ts_pm_ops, }, }; module_i2c_driver(st1232_ts_driver); MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>"); MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Tony SIM107874.14%19.09%
Bastian Hecht21314.65%19.09%
Rafael J. Wysocki674.61%218.18%
Laurent Pinchart382.61%19.09%
Magnus Damm372.54%19.09%
Dmitry Torokhov110.76%19.09%
Jingoo Han60.41%218.18%
Sachin Kamat30.21%19.09%
Axel Lin10.07%19.09%
Bill Pemberton0.00%00.00%
Total1454100.00%11100.00%
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