1 // SPDX-License-Identifier: GPL-2.0-only
3 * Synaptics NavPoint (PXA27x SSP/SPI) driver.
5 * Copyright (C) 2012 Paul Parsons <lost.distance@yahoo.com>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/clk.h>
12 #include <linux/delay.h>
13 #include <linux/gpio.h>
14 #include <linux/input.h>
15 #include <linux/input/navpoint.h>
16 #include <linux/interrupt.h>
17 #include <linux/mutex.h>
18 #include <linux/pxa2xx_ssp.h>
19 #include <linux/slab.h>
22 * Synaptics Modular Embedded Protocol: Module Packet Format.
23 * Module header byte 2:0 = Length (# bytes that follow)
24 * Module header byte 4:3 = Control
25 * Module header byte 7:5 = Module Address
27 #define HEADER_LENGTH(byte) ((byte) & 0x07)
28 #define HEADER_CONTROL(byte) (((byte) >> 3) & 0x03)
29 #define HEADER_ADDRESS(byte) ((byte) >> 5)
32 struct ssp_device
*ssp
;
33 struct input_dev
*input
;
37 u8 data
[1 + HEADER_LENGTH(0xff)];
41 * Initialization values for SSCR0_x, SSCR1_x, SSSR_x.
43 static const u32 sscr0
= 0
44 | SSCR0_TUM
/* TIM = 1; No TUR interrupts */
45 | SSCR0_RIM
/* RIM = 1; No ROR interrupts */
46 | SSCR0_SSE
/* SSE = 1; SSP enabled */
47 | SSCR0_Motorola
/* FRF = 0; Motorola SPI */
48 | SSCR0_DataSize(16) /* DSS = 15; Data size = 16-bit */
50 static const u32 sscr1
= 0
51 | SSCR1_SCFR
/* SCFR = 1; SSPSCLK only during transfers */
52 | SSCR1_SCLKDIR
/* SCLKDIR = 1; Slave mode */
53 | SSCR1_SFRMDIR
/* SFRMDIR = 1; Slave mode */
54 | SSCR1_RWOT
/* RWOT = 1; Receive without transmit mode */
55 | SSCR1_RxTresh(1) /* RFT = 0; Receive FIFO threshold = 1 */
56 | SSCR1_SPH
/* SPH = 1; SSPSCLK inactive 0.5 + 1 cycles */
57 | SSCR1_RIE
/* RIE = 1; Receive FIFO interrupt enabled */
59 static const u32 sssr
= 0
60 | SSSR_BCE
/* BCE = 1; Clear BCE */
61 | SSSR_TUR
/* TUR = 1; Clear TUR */
62 | SSSR_EOC
/* EOC = 1; Clear EOC */
63 | SSSR_TINT
/* TINT = 1; Clear TINT */
64 | SSSR_PINT
/* PINT = 1; Clear PINT */
65 | SSSR_ROR
/* ROR = 1; Clear ROR */
69 * MEP Query $22: Touchpad Coordinate Range Query is not supported by
70 * the NavPoint module, so sampled values provide the default limits.
72 #define NAVPOINT_X_MIN 1278
73 #define NAVPOINT_X_MAX 5340
74 #define NAVPOINT_Y_MIN 1572
75 #define NAVPOINT_Y_MAX 4396
76 #define NAVPOINT_PRESSURE_MIN 0
77 #define NAVPOINT_PRESSURE_MAX 255
79 static void navpoint_packet(struct navpoint
*navpoint
)
85 switch (navpoint
->data
[0]) {
86 case 0xff: /* Garbage (packet?) between reset and Hello packet */
87 case 0x00: /* Module 0, NULL packet */
90 case 0x0e: /* Module 0, Absolute packet */
91 finger
= (navpoint
->data
[1] & 0x01);
92 gesture
= (navpoint
->data
[1] & 0x02);
93 x
= ((navpoint
->data
[2] & 0x1f) << 8) | navpoint
->data
[3];
94 y
= ((navpoint
->data
[4] & 0x1f) << 8) | navpoint
->data
[5];
95 z
= navpoint
->data
[6];
96 input_report_key(navpoint
->input
, BTN_TOUCH
, finger
);
97 input_report_abs(navpoint
->input
, ABS_X
, x
);
98 input_report_abs(navpoint
->input
, ABS_Y
, y
);
99 input_report_abs(navpoint
->input
, ABS_PRESSURE
, z
);
100 input_report_key(navpoint
->input
, BTN_TOOL_FINGER
, finger
);
101 input_report_key(navpoint
->input
, BTN_LEFT
, gesture
);
102 input_sync(navpoint
->input
);
105 case 0x19: /* Module 0, Hello packet */
106 if ((navpoint
->data
[1] & 0xf0) == 0x10)
110 dev_warn(navpoint
->dev
,
111 "spurious packet: data=0x%02x,0x%02x,...\n",
112 navpoint
->data
[0], navpoint
->data
[1]);
117 static irqreturn_t
navpoint_irq(int irq
, void *dev_id
)
119 struct navpoint
*navpoint
= dev_id
;
120 struct ssp_device
*ssp
= navpoint
->ssp
;
121 irqreturn_t ret
= IRQ_NONE
;
124 status
= pxa_ssp_read_reg(ssp
, SSSR
);
126 dev_warn(navpoint
->dev
,
127 "unexpected interrupt: status=0x%08x\n", status
);
128 pxa_ssp_write_reg(ssp
, SSSR
, (status
& sssr
));
132 while (status
& SSSR_RNE
) {
135 data
= pxa_ssp_read_reg(ssp
, SSDR
);
136 navpoint
->data
[navpoint
->index
+ 0] = (data
>> 8);
137 navpoint
->data
[navpoint
->index
+ 1] = data
;
138 navpoint
->index
+= 2;
139 if (HEADER_LENGTH(navpoint
->data
[0]) < navpoint
->index
) {
140 navpoint_packet(navpoint
);
143 status
= pxa_ssp_read_reg(ssp
, SSSR
);
150 static void navpoint_up(struct navpoint
*navpoint
)
152 struct ssp_device
*ssp
= navpoint
->ssp
;
155 clk_prepare_enable(ssp
->clk
);
157 pxa_ssp_write_reg(ssp
, SSCR1
, sscr1
);
158 pxa_ssp_write_reg(ssp
, SSSR
, sssr
);
159 pxa_ssp_write_reg(ssp
, SSTO
, 0);
160 pxa_ssp_write_reg(ssp
, SSCR0
, sscr0
); /* SSCR0_SSE written last */
162 /* Wait until SSP port is ready for slave clock operations */
163 for (timeout
= 100; timeout
!= 0; --timeout
) {
164 if (!(pxa_ssp_read_reg(ssp
, SSSR
) & SSSR_CSS
))
170 dev_err(navpoint
->dev
,
171 "timeout waiting for SSSR[CSS] to clear\n");
173 if (gpio_is_valid(navpoint
->gpio
))
174 gpio_set_value(navpoint
->gpio
, 1);
177 static void navpoint_down(struct navpoint
*navpoint
)
179 struct ssp_device
*ssp
= navpoint
->ssp
;
181 if (gpio_is_valid(navpoint
->gpio
))
182 gpio_set_value(navpoint
->gpio
, 0);
184 pxa_ssp_write_reg(ssp
, SSCR0
, 0);
186 clk_disable_unprepare(ssp
->clk
);
189 static int navpoint_open(struct input_dev
*input
)
191 struct navpoint
*navpoint
= input_get_drvdata(input
);
193 navpoint_up(navpoint
);
198 static void navpoint_close(struct input_dev
*input
)
200 struct navpoint
*navpoint
= input_get_drvdata(input
);
202 navpoint_down(navpoint
);
205 static int navpoint_probe(struct platform_device
*pdev
)
207 const struct navpoint_platform_data
*pdata
=
208 dev_get_platdata(&pdev
->dev
);
209 struct ssp_device
*ssp
;
210 struct input_dev
*input
;
211 struct navpoint
*navpoint
;
215 dev_err(&pdev
->dev
, "no platform data\n");
219 if (gpio_is_valid(pdata
->gpio
)) {
220 error
= gpio_request_one(pdata
->gpio
, GPIOF_OUT_INIT_LOW
,
226 ssp
= pxa_ssp_request(pdata
->port
, pdev
->name
);
232 /* HaRET does not disable devices before jumping into Linux */
233 if (pxa_ssp_read_reg(ssp
, SSCR0
) & SSCR0_SSE
) {
234 pxa_ssp_write_reg(ssp
, SSCR0
, 0);
235 dev_warn(&pdev
->dev
, "ssp%d already enabled\n", pdata
->port
);
238 navpoint
= kzalloc(sizeof(*navpoint
), GFP_KERNEL
);
239 input
= input_allocate_device();
240 if (!navpoint
|| !input
) {
246 navpoint
->input
= input
;
247 navpoint
->dev
= &pdev
->dev
;
248 navpoint
->gpio
= pdata
->gpio
;
250 input
->name
= pdev
->name
;
251 input
->dev
.parent
= &pdev
->dev
;
253 __set_bit(EV_KEY
, input
->evbit
);
254 __set_bit(EV_ABS
, input
->evbit
);
255 __set_bit(BTN_LEFT
, input
->keybit
);
256 __set_bit(BTN_TOUCH
, input
->keybit
);
257 __set_bit(BTN_TOOL_FINGER
, input
->keybit
);
259 input_set_abs_params(input
, ABS_X
,
260 NAVPOINT_X_MIN
, NAVPOINT_X_MAX
, 0, 0);
261 input_set_abs_params(input
, ABS_Y
,
262 NAVPOINT_Y_MIN
, NAVPOINT_Y_MAX
, 0, 0);
263 input_set_abs_params(input
, ABS_PRESSURE
,
264 NAVPOINT_PRESSURE_MIN
, NAVPOINT_PRESSURE_MAX
,
267 input
->open
= navpoint_open
;
268 input
->close
= navpoint_close
;
270 input_set_drvdata(input
, navpoint
);
272 error
= request_irq(ssp
->irq
, navpoint_irq
, 0, pdev
->name
, navpoint
);
276 error
= input_register_device(input
);
280 platform_set_drvdata(pdev
, navpoint
);
281 dev_dbg(&pdev
->dev
, "ssp%d, irq %d\n", pdata
->port
, ssp
->irq
);
286 free_irq(ssp
->irq
, navpoint
);
288 input_free_device(input
);
292 if (gpio_is_valid(pdata
->gpio
))
293 gpio_free(pdata
->gpio
);
298 static int navpoint_remove(struct platform_device
*pdev
)
300 const struct navpoint_platform_data
*pdata
=
301 dev_get_platdata(&pdev
->dev
);
302 struct navpoint
*navpoint
= platform_get_drvdata(pdev
);
303 struct ssp_device
*ssp
= navpoint
->ssp
;
305 free_irq(ssp
->irq
, navpoint
);
307 input_unregister_device(navpoint
->input
);
312 if (gpio_is_valid(pdata
->gpio
))
313 gpio_free(pdata
->gpio
);
318 static int __maybe_unused
navpoint_suspend(struct device
*dev
)
320 struct platform_device
*pdev
= to_platform_device(dev
);
321 struct navpoint
*navpoint
= platform_get_drvdata(pdev
);
322 struct input_dev
*input
= navpoint
->input
;
324 mutex_lock(&input
->mutex
);
325 if (input_device_enabled(input
))
326 navpoint_down(navpoint
);
327 mutex_unlock(&input
->mutex
);
332 static int __maybe_unused
navpoint_resume(struct device
*dev
)
334 struct platform_device
*pdev
= to_platform_device(dev
);
335 struct navpoint
*navpoint
= platform_get_drvdata(pdev
);
336 struct input_dev
*input
= navpoint
->input
;
338 mutex_lock(&input
->mutex
);
339 if (input_device_enabled(input
))
340 navpoint_up(navpoint
);
341 mutex_unlock(&input
->mutex
);
346 static SIMPLE_DEV_PM_OPS(navpoint_pm_ops
, navpoint_suspend
, navpoint_resume
);
348 static struct platform_driver navpoint_driver
= {
349 .probe
= navpoint_probe
,
350 .remove
= navpoint_remove
,
353 .pm
= &navpoint_pm_ops
,
357 module_platform_driver(navpoint_driver
);
359 MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
360 MODULE_DESCRIPTION("Synaptics NavPoint (PXA27x SSP/SPI) driver");
361 MODULE_LICENSE("GPL");
362 MODULE_ALIAS("platform:navpoint");