1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Touchscreen driver for Marvell 88PM860x |
4 | * |
5 | * Copyright (C) 2009 Marvell International Ltd. |
6 | * Haojian Zhuang <haojian.zhuang@marvell.com> |
7 | */ |
8 | #include <linux/kernel.h> |
9 | #include <linux/module.h> |
10 | #include <linux/of.h> |
11 | #include <linux/platform_device.h> |
12 | #include <linux/i2c.h> |
13 | #include <linux/input.h> |
14 | #include <linux/mfd/88pm860x.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/device.h> |
17 | |
18 | #define MEAS_LEN (8) |
19 | #define ACCURATE_BIT (12) |
20 | |
21 | /* touch register */ |
22 | #define MEAS_EN3 (0x52) |
23 | |
24 | #define MEAS_TSIX_1 (0x8D) |
25 | #define MEAS_TSIX_2 (0x8E) |
26 | #define MEAS_TSIY_1 (0x8F) |
27 | #define MEAS_TSIY_2 (0x90) |
28 | #define MEAS_TSIZ1_1 (0x91) |
29 | #define MEAS_TSIZ1_2 (0x92) |
30 | #define MEAS_TSIZ2_1 (0x93) |
31 | #define MEAS_TSIZ2_2 (0x94) |
32 | |
33 | /* bit definitions of touch */ |
34 | #define MEAS_PD_EN (1 << 3) |
35 | #define MEAS_TSIX_EN (1 << 4) |
36 | #define MEAS_TSIY_EN (1 << 5) |
37 | #define MEAS_TSIZ1_EN (1 << 6) |
38 | #define MEAS_TSIZ2_EN (1 << 7) |
39 | |
40 | struct pm860x_touch { |
41 | struct input_dev *idev; |
42 | struct i2c_client *i2c; |
43 | struct pm860x_chip *chip; |
44 | int irq; |
45 | int res_x; /* resistor of Xplate */ |
46 | }; |
47 | |
48 | static irqreturn_t pm860x_touch_handler(int irq, void *data) |
49 | { |
50 | struct pm860x_touch *touch = data; |
51 | struct pm860x_chip *chip = touch->chip; |
52 | unsigned char buf[MEAS_LEN]; |
53 | int x, y, pen_down; |
54 | int z1, z2, rt = 0; |
55 | int ret; |
56 | |
57 | ret = pm860x_bulk_read(touch->i2c, MEAS_TSIX_1, MEAS_LEN, buf); |
58 | if (ret < 0) |
59 | goto out; |
60 | |
61 | pen_down = buf[1] & (1 << 6); |
62 | x = ((buf[0] & 0xFF) << 4) | (buf[1] & 0x0F); |
63 | y = ((buf[2] & 0xFF) << 4) | (buf[3] & 0x0F); |
64 | z1 = ((buf[4] & 0xFF) << 4) | (buf[5] & 0x0F); |
65 | z2 = ((buf[6] & 0xFF) << 4) | (buf[7] & 0x0F); |
66 | |
67 | if (pen_down) { |
68 | if ((x != 0) && (z1 != 0) && (touch->res_x != 0)) { |
69 | rt = z2 / z1 - 1; |
70 | rt = (rt * touch->res_x * x) >> ACCURATE_BIT; |
71 | dev_dbg(chip->dev, "z1:%d, z2:%d, rt:%d\n" , |
72 | z1, z2, rt); |
73 | } |
74 | input_report_abs(dev: touch->idev, ABS_X, value: x); |
75 | input_report_abs(dev: touch->idev, ABS_Y, value: y); |
76 | input_report_abs(dev: touch->idev, ABS_PRESSURE, value: rt); |
77 | input_report_key(dev: touch->idev, BTN_TOUCH, value: 1); |
78 | dev_dbg(chip->dev, "pen down at [%d, %d].\n" , x, y); |
79 | } else { |
80 | input_report_abs(dev: touch->idev, ABS_PRESSURE, value: 0); |
81 | input_report_key(dev: touch->idev, BTN_TOUCH, value: 0); |
82 | dev_dbg(chip->dev, "pen release\n" ); |
83 | } |
84 | input_sync(dev: touch->idev); |
85 | |
86 | out: |
87 | return IRQ_HANDLED; |
88 | } |
89 | |
90 | static int pm860x_touch_open(struct input_dev *dev) |
91 | { |
92 | struct pm860x_touch *touch = input_get_drvdata(dev); |
93 | int data, ret; |
94 | |
95 | data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN |
96 | | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN; |
97 | ret = pm860x_set_bits(touch->i2c, MEAS_EN3, data, data); |
98 | if (ret < 0) |
99 | goto out; |
100 | return 0; |
101 | out: |
102 | return ret; |
103 | } |
104 | |
105 | static void pm860x_touch_close(struct input_dev *dev) |
106 | { |
107 | struct pm860x_touch *touch = input_get_drvdata(dev); |
108 | int data; |
109 | |
110 | data = MEAS_PD_EN | MEAS_TSIX_EN | MEAS_TSIY_EN |
111 | | MEAS_TSIZ1_EN | MEAS_TSIZ2_EN; |
112 | pm860x_set_bits(touch->i2c, MEAS_EN3, data, 0); |
113 | } |
114 | |
115 | #ifdef CONFIG_OF |
116 | static int pm860x_touch_dt_init(struct platform_device *pdev, |
117 | struct pm860x_chip *chip, |
118 | int *res_x) |
119 | { |
120 | struct device_node *np = pdev->dev.parent->of_node; |
121 | struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \ |
122 | : chip->companion; |
123 | int data, n, ret; |
124 | if (!np) |
125 | return -ENODEV; |
126 | np = of_get_child_by_name(node: np, name: "touch" ); |
127 | if (!np) { |
128 | dev_err(&pdev->dev, "Can't find touch node\n" ); |
129 | return -EINVAL; |
130 | } |
131 | /* set GPADC MISC1 register */ |
132 | data = 0; |
133 | if (!of_property_read_u32(np, propname: "marvell,88pm860x-gpadc-prebias" , out_value: &n)) |
134 | data |= (n << 1) & PM8607_GPADC_PREBIAS_MASK; |
135 | if (!of_property_read_u32(np, propname: "marvell,88pm860x-gpadc-slot-cycle" , out_value: &n)) |
136 | data |= (n << 3) & PM8607_GPADC_SLOT_CYCLE_MASK; |
137 | if (!of_property_read_u32(np, propname: "marvell,88pm860x-gpadc-off-scale" , out_value: &n)) |
138 | data |= (n << 5) & PM8607_GPADC_OFF_SCALE_MASK; |
139 | if (!of_property_read_u32(np, propname: "marvell,88pm860x-gpadc-sw-cal" , out_value: &n)) |
140 | data |= (n << 7) & PM8607_GPADC_SW_CAL_MASK; |
141 | if (data) { |
142 | ret = pm860x_reg_write(i2c, PM8607_GPADC_MISC1, data); |
143 | if (ret < 0) |
144 | goto err_put_node; |
145 | } |
146 | /* set tsi prebias time */ |
147 | if (!of_property_read_u32(np, propname: "marvell,88pm860x-tsi-prebias" , out_value: &data)) { |
148 | ret = pm860x_reg_write(i2c, PM8607_TSI_PREBIAS, data); |
149 | if (ret < 0) |
150 | goto err_put_node; |
151 | } |
152 | /* set prebias & prechg time of pen detect */ |
153 | data = 0; |
154 | if (!of_property_read_u32(np, propname: "marvell,88pm860x-pen-prebias" , out_value: &n)) |
155 | data |= n & PM8607_PD_PREBIAS_MASK; |
156 | if (!of_property_read_u32(np, propname: "marvell,88pm860x-pen-prechg" , out_value: &n)) |
157 | data |= n & PM8607_PD_PRECHG_MASK; |
158 | if (data) { |
159 | ret = pm860x_reg_write(i2c, PM8607_PD_PREBIAS, data); |
160 | if (ret < 0) |
161 | goto err_put_node; |
162 | } |
163 | of_property_read_u32(np, propname: "marvell,88pm860x-resistor-X" , out_value: res_x); |
164 | |
165 | of_node_put(node: np); |
166 | |
167 | return 0; |
168 | |
169 | err_put_node: |
170 | of_node_put(node: np); |
171 | |
172 | return -EINVAL; |
173 | } |
174 | #else |
175 | #define pm860x_touch_dt_init(x, y, z) (-1) |
176 | #endif |
177 | |
178 | static int pm860x_touch_probe(struct platform_device *pdev) |
179 | { |
180 | struct pm860x_chip *chip = dev_get_drvdata(dev: pdev->dev.parent); |
181 | struct pm860x_touch_pdata *pdata = dev_get_platdata(dev: &pdev->dev); |
182 | struct pm860x_touch *touch; |
183 | struct i2c_client *i2c = (chip->id == CHIP_PM8607) ? chip->client \ |
184 | : chip->companion; |
185 | int irq, ret, res_x = 0, data = 0; |
186 | |
187 | irq = platform_get_irq(pdev, 0); |
188 | if (irq < 0) |
189 | return -EINVAL; |
190 | |
191 | if (pm860x_touch_dt_init(pdev, chip, res_x: &res_x)) { |
192 | if (pdata) { |
193 | /* set GPADC MISC1 register */ |
194 | data = 0; |
195 | data |= (pdata->gpadc_prebias << 1) |
196 | & PM8607_GPADC_PREBIAS_MASK; |
197 | data |= (pdata->slot_cycle << 3) |
198 | & PM8607_GPADC_SLOT_CYCLE_MASK; |
199 | data |= (pdata->off_scale << 5) |
200 | & PM8607_GPADC_OFF_SCALE_MASK; |
201 | data |= (pdata->sw_cal << 7) |
202 | & PM8607_GPADC_SW_CAL_MASK; |
203 | if (data) { |
204 | ret = pm860x_reg_write(i2c, |
205 | PM8607_GPADC_MISC1, data); |
206 | if (ret < 0) |
207 | return -EINVAL; |
208 | } |
209 | /* set tsi prebias time */ |
210 | if (pdata->tsi_prebias) { |
211 | data = pdata->tsi_prebias; |
212 | ret = pm860x_reg_write(i2c, |
213 | PM8607_TSI_PREBIAS, data); |
214 | if (ret < 0) |
215 | return -EINVAL; |
216 | } |
217 | /* set prebias & prechg time of pen detect */ |
218 | data = 0; |
219 | data |= pdata->pen_prebias |
220 | & PM8607_PD_PREBIAS_MASK; |
221 | data |= (pdata->pen_prechg << 5) |
222 | & PM8607_PD_PRECHG_MASK; |
223 | if (data) { |
224 | ret = pm860x_reg_write(i2c, |
225 | PM8607_PD_PREBIAS, data); |
226 | if (ret < 0) |
227 | return -EINVAL; |
228 | } |
229 | res_x = pdata->res_x; |
230 | } else { |
231 | dev_err(&pdev->dev, "failed to get platform data\n" ); |
232 | return -EINVAL; |
233 | } |
234 | } |
235 | /* enable GPADC */ |
236 | ret = pm860x_set_bits(i2c, PM8607_GPADC_MISC1, PM8607_GPADC_EN, |
237 | PM8607_GPADC_EN); |
238 | if (ret) |
239 | return ret; |
240 | |
241 | touch = devm_kzalloc(dev: &pdev->dev, size: sizeof(struct pm860x_touch), |
242 | GFP_KERNEL); |
243 | if (!touch) |
244 | return -ENOMEM; |
245 | |
246 | touch->idev = devm_input_allocate_device(&pdev->dev); |
247 | if (!touch->idev) { |
248 | dev_err(&pdev->dev, "Failed to allocate input device!\n" ); |
249 | return -ENOMEM; |
250 | } |
251 | |
252 | touch->idev->name = "88pm860x-touch" ; |
253 | touch->idev->phys = "88pm860x/input0" ; |
254 | touch->idev->id.bustype = BUS_I2C; |
255 | touch->idev->dev.parent = &pdev->dev; |
256 | touch->idev->open = pm860x_touch_open; |
257 | touch->idev->close = pm860x_touch_close; |
258 | touch->chip = chip; |
259 | touch->i2c = i2c; |
260 | touch->irq = irq; |
261 | touch->res_x = res_x; |
262 | input_set_drvdata(dev: touch->idev, data: touch); |
263 | |
264 | ret = devm_request_threaded_irq(dev: &pdev->dev, irq: touch->irq, NULL, |
265 | thread_fn: pm860x_touch_handler, IRQF_ONESHOT, |
266 | devname: "touch" , dev_id: touch); |
267 | if (ret < 0) |
268 | return ret; |
269 | |
270 | __set_bit(EV_ABS, touch->idev->evbit); |
271 | __set_bit(ABS_X, touch->idev->absbit); |
272 | __set_bit(ABS_Y, touch->idev->absbit); |
273 | __set_bit(ABS_PRESSURE, touch->idev->absbit); |
274 | __set_bit(EV_SYN, touch->idev->evbit); |
275 | __set_bit(EV_KEY, touch->idev->evbit); |
276 | __set_bit(BTN_TOUCH, touch->idev->keybit); |
277 | |
278 | input_set_abs_params(dev: touch->idev, ABS_X, min: 0, max: 1 << ACCURATE_BIT, fuzz: 0, flat: 0); |
279 | input_set_abs_params(dev: touch->idev, ABS_Y, min: 0, max: 1 << ACCURATE_BIT, fuzz: 0, flat: 0); |
280 | input_set_abs_params(dev: touch->idev, ABS_PRESSURE, min: 0, max: 1 << ACCURATE_BIT, |
281 | fuzz: 0, flat: 0); |
282 | |
283 | ret = input_register_device(touch->idev); |
284 | if (ret < 0) { |
285 | dev_err(chip->dev, "Failed to register touch!\n" ); |
286 | return ret; |
287 | } |
288 | |
289 | return 0; |
290 | } |
291 | |
292 | static struct platform_driver pm860x_touch_driver = { |
293 | .driver = { |
294 | .name = "88pm860x-touch" , |
295 | }, |
296 | .probe = pm860x_touch_probe, |
297 | }; |
298 | module_platform_driver(pm860x_touch_driver); |
299 | |
300 | MODULE_DESCRIPTION("Touchscreen driver for Marvell Semiconductor 88PM860x" ); |
301 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>" ); |
302 | MODULE_LICENSE("GPL" ); |
303 | MODULE_ALIAS("platform:88pm860x-touch" ); |
304 | |
305 | |