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479 lines
12 KiB
479 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Driver for Semtech SX8654 I2C touchscreen controller. |
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* |
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* Copyright (c) 2015 Armadeus Systems |
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* Sébastien Szymanski <[email protected]> |
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* |
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* Using code from: |
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* - sx865x.c |
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* Copyright (c) 2013 U-MoBo Srl |
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* Pierluigi Passaro <[email protected]> |
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* - sx8650.c |
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* Copyright (c) 2009 Wayne Roberts |
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* - tsc2007.c |
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* Copyright (c) 2008 Kwangwoo Lee |
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* - ads7846.c |
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* Copyright (c) 2005 David Brownell |
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* Copyright (c) 2006 Nokia Corporation |
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* - corgi_ts.c |
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* Copyright (C) 2004-2005 Richard Purdie |
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* - omap_ts.[hc], ads7846.h, ts_osk.c |
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* Copyright (C) 2002 MontaVista Software |
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* Copyright (C) 2004 Texas Instruments |
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* Copyright (C) 2005 Dirk Behme |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/delay.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/i2c.h> |
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#include <linux/input.h> |
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#include <linux/input/touchscreen.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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/* register addresses */ |
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#define I2C_REG_TOUCH0 0x00 |
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#define I2C_REG_TOUCH1 0x01 |
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#define I2C_REG_CHANMASK 0x04 |
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#define I2C_REG_IRQMASK 0x22 |
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#define I2C_REG_IRQSRC 0x23 |
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#define I2C_REG_SOFTRESET 0x3f |
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#define I2C_REG_SX8650_STAT 0x05 |
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#define SX8650_STAT_CONVIRQ BIT(7) |
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/* commands */ |
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#define CMD_READ_REGISTER 0x40 |
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#define CMD_PENTRG 0xe0 |
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/* value for I2C_REG_SOFTRESET */ |
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#define SOFTRESET_VALUE 0xde |
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/* bits for I2C_REG_IRQSRC */ |
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#define IRQ_PENTOUCH_TOUCHCONVDONE BIT(3) |
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#define IRQ_PENRELEASE BIT(2) |
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/* bits for RegTouch1 */ |
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#define CONDIRQ 0x20 |
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#define RPDNT_100K 0x00 |
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#define FILT_7SA 0x03 |
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/* bits for I2C_REG_CHANMASK */ |
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#define CONV_X BIT(7) |
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#define CONV_Y BIT(6) |
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/* coordinates rate: higher nibble of CTRL0 register */ |
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#define RATE_MANUAL 0x00 |
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#define RATE_5000CPS 0xf0 |
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/* power delay: lower nibble of CTRL0 register */ |
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#define POWDLY_1_1MS 0x0b |
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/* for sx8650, as we have no pen release IRQ there: timeout in ns following the |
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* last PENIRQ after which we assume the pen is lifted. |
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*/ |
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#define SX8650_PENIRQ_TIMEOUT msecs_to_jiffies(10) |
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#define MAX_12BIT ((1 << 12) - 1) |
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#define MAX_I2C_READ_LEN 10 /* see datasheet section 5.1.5 */ |
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/* channel definition */ |
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#define CH_X 0x00 |
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#define CH_Y 0x01 |
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struct sx865x_data { |
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u8 cmd_manual; |
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u8 chan_mask; |
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bool has_irq_penrelease; |
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bool has_reg_irqmask; |
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irq_handler_t irqh; |
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}; |
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struct sx8654 { |
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struct input_dev *input; |
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struct i2c_client *client; |
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struct gpio_desc *gpio_reset; |
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spinlock_t lock; /* for input reporting from irq/timer */ |
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struct timer_list timer; |
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struct touchscreen_properties props; |
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const struct sx865x_data *data; |
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}; |
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static inline void sx865x_penrelease(struct sx8654 *ts) |
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{ |
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struct input_dev *input_dev = ts->input; |
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input_report_key(input_dev, BTN_TOUCH, 0); |
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input_sync(input_dev); |
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} |
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static void sx865x_penrelease_timer_handler(struct timer_list *t) |
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{ |
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struct sx8654 *ts = from_timer(ts, t, timer); |
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unsigned long flags; |
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spin_lock_irqsave(&ts->lock, flags); |
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sx865x_penrelease(ts); |
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spin_unlock_irqrestore(&ts->lock, flags); |
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dev_dbg(&ts->client->dev, "penrelease by timer\n"); |
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} |
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static irqreturn_t sx8650_irq(int irq, void *handle) |
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{ |
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struct sx8654 *ts = handle; |
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struct device *dev = &ts->client->dev; |
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int len, i; |
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unsigned long flags; |
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u8 stat; |
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u16 x, y; |
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u16 ch; |
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u16 chdata; |
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__be16 data[MAX_I2C_READ_LEN / sizeof(__be16)]; |
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u8 nchan = hweight32(ts->data->chan_mask); |
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u8 readlen = nchan * sizeof(*data); |
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stat = i2c_smbus_read_byte_data(ts->client, CMD_READ_REGISTER |
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| I2C_REG_SX8650_STAT); |
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if (!(stat & SX8650_STAT_CONVIRQ)) { |
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dev_dbg(dev, "%s ignore stat [0x%02x]", __func__, stat); |
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return IRQ_HANDLED; |
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} |
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len = i2c_master_recv(ts->client, (u8 *)data, readlen); |
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if (len != readlen) { |
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dev_dbg(dev, "ignore short recv (%d)\n", len); |
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return IRQ_HANDLED; |
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} |
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spin_lock_irqsave(&ts->lock, flags); |
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x = 0; |
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y = 0; |
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for (i = 0; i < nchan; i++) { |
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chdata = be16_to_cpu(data[i]); |
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if (unlikely(chdata == 0xFFFF)) { |
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dev_dbg(dev, "invalid qualified data @ %d\n", i); |
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continue; |
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} else if (unlikely(chdata & 0x8000)) { |
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dev_warn(dev, "hibit @ %d [0x%04x]\n", i, chdata); |
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continue; |
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} |
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ch = chdata >> 12; |
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if (ch == CH_X) |
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x = chdata & MAX_12BIT; |
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else if (ch == CH_Y) |
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y = chdata & MAX_12BIT; |
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else |
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dev_warn(dev, "unknown channel %d [0x%04x]\n", ch, |
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chdata); |
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} |
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touchscreen_report_pos(ts->input, &ts->props, x, y, false); |
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input_report_key(ts->input, BTN_TOUCH, 1); |
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input_sync(ts->input); |
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dev_dbg(dev, "point(%4d,%4d)\n", x, y); |
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mod_timer(&ts->timer, jiffies + SX8650_PENIRQ_TIMEOUT); |
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spin_unlock_irqrestore(&ts->lock, flags); |
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return IRQ_HANDLED; |
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} |
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static irqreturn_t sx8654_irq(int irq, void *handle) |
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{ |
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struct sx8654 *sx8654 = handle; |
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int irqsrc; |
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u8 data[4]; |
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unsigned int x, y; |
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int retval; |
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irqsrc = i2c_smbus_read_byte_data(sx8654->client, |
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CMD_READ_REGISTER | I2C_REG_IRQSRC); |
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dev_dbg(&sx8654->client->dev, "irqsrc = 0x%x", irqsrc); |
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if (irqsrc < 0) |
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goto out; |
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if (irqsrc & IRQ_PENRELEASE) { |
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dev_dbg(&sx8654->client->dev, "pen release interrupt"); |
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input_report_key(sx8654->input, BTN_TOUCH, 0); |
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input_sync(sx8654->input); |
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} |
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if (irqsrc & IRQ_PENTOUCH_TOUCHCONVDONE) { |
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dev_dbg(&sx8654->client->dev, "pen touch interrupt"); |
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retval = i2c_master_recv(sx8654->client, data, sizeof(data)); |
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if (retval != sizeof(data)) |
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goto out; |
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/* invalid data */ |
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if (unlikely(data[0] & 0x80 || data[2] & 0x80)) |
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goto out; |
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x = ((data[0] & 0xf) << 8) | (data[1]); |
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y = ((data[2] & 0xf) << 8) | (data[3]); |
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touchscreen_report_pos(sx8654->input, &sx8654->props, x, y, |
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false); |
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input_report_key(sx8654->input, BTN_TOUCH, 1); |
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input_sync(sx8654->input); |
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dev_dbg(&sx8654->client->dev, "point(%4d,%4d)\n", x, y); |
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} |
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out: |
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return IRQ_HANDLED; |
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} |
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static int sx8654_reset(struct sx8654 *ts) |
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{ |
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int err; |
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if (ts->gpio_reset) { |
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gpiod_set_value_cansleep(ts->gpio_reset, 1); |
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udelay(2); /* Tpulse > 1µs */ |
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gpiod_set_value_cansleep(ts->gpio_reset, 0); |
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} else { |
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dev_dbg(&ts->client->dev, "NRST unavailable, try softreset\n"); |
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err = i2c_smbus_write_byte_data(ts->client, I2C_REG_SOFTRESET, |
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SOFTRESET_VALUE); |
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if (err) |
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return err; |
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} |
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return 0; |
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} |
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static int sx8654_open(struct input_dev *dev) |
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{ |
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struct sx8654 *sx8654 = input_get_drvdata(dev); |
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struct i2c_client *client = sx8654->client; |
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int error; |
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/* enable pen trigger mode */ |
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error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, |
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RATE_5000CPS | POWDLY_1_1MS); |
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if (error) { |
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dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed"); |
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return error; |
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} |
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error = i2c_smbus_write_byte(client, CMD_PENTRG); |
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if (error) { |
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dev_err(&client->dev, "writing command CMD_PENTRG failed"); |
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return error; |
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} |
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enable_irq(client->irq); |
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return 0; |
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} |
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static void sx8654_close(struct input_dev *dev) |
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{ |
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struct sx8654 *sx8654 = input_get_drvdata(dev); |
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struct i2c_client *client = sx8654->client; |
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int error; |
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disable_irq(client->irq); |
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if (!sx8654->data->has_irq_penrelease) |
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del_timer_sync(&sx8654->timer); |
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/* enable manual mode mode */ |
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error = i2c_smbus_write_byte(client, sx8654->data->cmd_manual); |
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if (error) { |
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dev_err(&client->dev, "writing command CMD_MANUAL failed"); |
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return; |
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} |
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error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, RATE_MANUAL); |
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if (error) { |
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dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed"); |
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return; |
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} |
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} |
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static int sx8654_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct sx8654 *sx8654; |
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struct input_dev *input; |
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int error; |
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if (!i2c_check_functionality(client->adapter, |
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I2C_FUNC_SMBUS_READ_WORD_DATA)) |
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return -ENXIO; |
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sx8654 = devm_kzalloc(&client->dev, sizeof(*sx8654), GFP_KERNEL); |
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if (!sx8654) |
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return -ENOMEM; |
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sx8654->gpio_reset = devm_gpiod_get_optional(&client->dev, "reset", |
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GPIOD_OUT_HIGH); |
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if (IS_ERR(sx8654->gpio_reset)) { |
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error = PTR_ERR(sx8654->gpio_reset); |
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if (error != -EPROBE_DEFER) |
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dev_err(&client->dev, "unable to get reset-gpio: %d\n", |
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error); |
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return error; |
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} |
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dev_dbg(&client->dev, "got GPIO reset pin\n"); |
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sx8654->data = device_get_match_data(&client->dev); |
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if (!sx8654->data) |
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sx8654->data = (const struct sx865x_data *)id->driver_data; |
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if (!sx8654->data) { |
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dev_err(&client->dev, "invalid or missing device data\n"); |
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return -EINVAL; |
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} |
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if (!sx8654->data->has_irq_penrelease) { |
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dev_dbg(&client->dev, "use timer for penrelease\n"); |
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timer_setup(&sx8654->timer, sx865x_penrelease_timer_handler, 0); |
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spin_lock_init(&sx8654->lock); |
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} |
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input = devm_input_allocate_device(&client->dev); |
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if (!input) |
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return -ENOMEM; |
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input->name = "SX8654 I2C Touchscreen"; |
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input->id.bustype = BUS_I2C; |
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input->dev.parent = &client->dev; |
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input->open = sx8654_open; |
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input->close = sx8654_close; |
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__set_bit(INPUT_PROP_DIRECT, input->propbit); |
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input_set_capability(input, EV_KEY, BTN_TOUCH); |
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input_set_abs_params(input, ABS_X, 0, MAX_12BIT, 0, 0); |
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input_set_abs_params(input, ABS_Y, 0, MAX_12BIT, 0, 0); |
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touchscreen_parse_properties(input, false, &sx8654->props); |
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sx8654->client = client; |
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sx8654->input = input; |
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input_set_drvdata(sx8654->input, sx8654); |
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error = sx8654_reset(sx8654); |
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if (error) { |
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dev_err(&client->dev, "reset failed"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, I2C_REG_CHANMASK, |
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sx8654->data->chan_mask); |
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if (error) { |
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dev_err(&client->dev, "writing to I2C_REG_CHANMASK failed"); |
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return error; |
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} |
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if (sx8654->data->has_reg_irqmask) { |
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error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK, |
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IRQ_PENTOUCH_TOUCHCONVDONE | |
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IRQ_PENRELEASE); |
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if (error) { |
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dev_err(&client->dev, "writing I2C_REG_IRQMASK failed"); |
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return error; |
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} |
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} |
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error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH1, |
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CONDIRQ | RPDNT_100K | FILT_7SA); |
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if (error) { |
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dev_err(&client->dev, "writing to I2C_REG_TOUCH1 failed"); |
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return error; |
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} |
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error = devm_request_threaded_irq(&client->dev, client->irq, |
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NULL, sx8654->data->irqh, |
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IRQF_ONESHOT, |
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client->name, sx8654); |
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if (error) { |
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dev_err(&client->dev, |
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"Failed to enable IRQ %d, error: %d\n", |
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client->irq, error); |
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return error; |
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} |
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/* Disable the IRQ, we'll enable it in sx8654_open() */ |
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disable_irq(client->irq); |
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error = input_register_device(sx8654->input); |
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if (error) |
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return error; |
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return 0; |
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} |
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static const struct sx865x_data sx8650_data = { |
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.cmd_manual = 0xb0, |
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.has_irq_penrelease = false, |
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.has_reg_irqmask = false, |
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.chan_mask = (CONV_X | CONV_Y), |
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.irqh = sx8650_irq, |
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}; |
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static const struct sx865x_data sx8654_data = { |
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.cmd_manual = 0xc0, |
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.has_irq_penrelease = true, |
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.has_reg_irqmask = true, |
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.chan_mask = (CONV_X | CONV_Y), |
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.irqh = sx8654_irq, |
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}; |
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#ifdef CONFIG_OF |
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static const struct of_device_id sx8654_of_match[] = { |
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{ |
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.compatible = "semtech,sx8650", |
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.data = &sx8650_data, |
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}, { |
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.compatible = "semtech,sx8654", |
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.data = &sx8654_data, |
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}, { |
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.compatible = "semtech,sx8655", |
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.data = &sx8654_data, |
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}, { |
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.compatible = "semtech,sx8656", |
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.data = &sx8654_data, |
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}, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, sx8654_of_match); |
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#endif |
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static const struct i2c_device_id sx8654_id_table[] = { |
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{ .name = "semtech_sx8650", .driver_data = (long)&sx8650_data }, |
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{ .name = "semtech_sx8654", .driver_data = (long)&sx8654_data }, |
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{ .name = "semtech_sx8655", .driver_data = (long)&sx8654_data }, |
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{ .name = "semtech_sx8656", .driver_data = (long)&sx8654_data }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, sx8654_id_table); |
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static struct i2c_driver sx8654_driver = { |
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.driver = { |
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.name = "sx8654", |
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.of_match_table = of_match_ptr(sx8654_of_match), |
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}, |
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.id_table = sx8654_id_table, |
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.probe = sx8654_probe, |
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}; |
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module_i2c_driver(sx8654_driver); |
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MODULE_AUTHOR("Sébastien Szymanski <[email protected]>"); |
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MODULE_DESCRIPTION("Semtech SX8654 I2C Touchscreen Driver"); |
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MODULE_LICENSE("GPL");
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