1351f683bSMiguel Ojeda // SPDX-License-Identifier: GPL-2.0+
2d47d8836SGeert Uytterhoeven /*
3d47d8836SGeert Uytterhoeven * HD44780 Character LCD driver for Linux
4d47d8836SGeert Uytterhoeven *
5d47d8836SGeert Uytterhoeven * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
6d47d8836SGeert Uytterhoeven * Copyright (C) 2016-2017 Glider bvba
7d47d8836SGeert Uytterhoeven */
8d47d8836SGeert Uytterhoeven
9d47d8836SGeert Uytterhoeven #include <linux/delay.h>
10d47d8836SGeert Uytterhoeven #include <linux/gpio/consumer.h>
11d47d8836SGeert Uytterhoeven #include <linux/module.h>
12ac316725SRandy Dunlap #include <linux/mod_devicetable.h>
13d47d8836SGeert Uytterhoeven #include <linux/platform_device.h>
14d47d8836SGeert Uytterhoeven #include <linux/property.h>
15d47d8836SGeert Uytterhoeven #include <linux/slab.h>
16d47d8836SGeert Uytterhoeven
1775354284SMasahiro Yamada #include "charlcd.h"
18718e05edSLars Poeschel #include "hd44780_common.h"
19d47d8836SGeert Uytterhoeven
20d47d8836SGeert Uytterhoeven enum hd44780_pin {
21d47d8836SGeert Uytterhoeven /* Order does matter due to writing to GPIO array subsets! */
22d47d8836SGeert Uytterhoeven PIN_DATA0, /* Optional */
23d47d8836SGeert Uytterhoeven PIN_DATA1, /* Optional */
24d47d8836SGeert Uytterhoeven PIN_DATA2, /* Optional */
25d47d8836SGeert Uytterhoeven PIN_DATA3, /* Optional */
26d47d8836SGeert Uytterhoeven PIN_DATA4,
27d47d8836SGeert Uytterhoeven PIN_DATA5,
28d47d8836SGeert Uytterhoeven PIN_DATA6,
29d47d8836SGeert Uytterhoeven PIN_DATA7,
30d47d8836SGeert Uytterhoeven PIN_CTRL_RS,
31d47d8836SGeert Uytterhoeven PIN_CTRL_RW, /* Optional */
32d47d8836SGeert Uytterhoeven PIN_CTRL_E,
33d47d8836SGeert Uytterhoeven PIN_CTRL_BL, /* Optional */
34d47d8836SGeert Uytterhoeven PIN_NUM
35d47d8836SGeert Uytterhoeven };
36d47d8836SGeert Uytterhoeven
37d47d8836SGeert Uytterhoeven struct hd44780 {
38d47d8836SGeert Uytterhoeven struct gpio_desc *pins[PIN_NUM];
39d47d8836SGeert Uytterhoeven };
40d47d8836SGeert Uytterhoeven
hd44780_backlight(struct charlcd * lcd,enum charlcd_onoff on)4166ce7d5cSLars Poeschel static void hd44780_backlight(struct charlcd *lcd, enum charlcd_onoff on)
42d47d8836SGeert Uytterhoeven {
432545c1c9SLars Poeschel struct hd44780_common *hdc = lcd->drvdata;
442545c1c9SLars Poeschel struct hd44780 *hd = hdc->hd44780;
45d47d8836SGeert Uytterhoeven
46d47d8836SGeert Uytterhoeven if (hd->pins[PIN_CTRL_BL])
47d47d8836SGeert Uytterhoeven gpiod_set_value_cansleep(hd->pins[PIN_CTRL_BL], on);
48d47d8836SGeert Uytterhoeven }
49d47d8836SGeert Uytterhoeven
hd44780_strobe_gpio(struct hd44780 * hd)50d47d8836SGeert Uytterhoeven static void hd44780_strobe_gpio(struct hd44780 *hd)
51d47d8836SGeert Uytterhoeven {
52d47d8836SGeert Uytterhoeven /* Maintain the data during 20 us before the strobe */
53d47d8836SGeert Uytterhoeven udelay(20);
54d47d8836SGeert Uytterhoeven
55d47d8836SGeert Uytterhoeven gpiod_set_value_cansleep(hd->pins[PIN_CTRL_E], 1);
56d47d8836SGeert Uytterhoeven
57d47d8836SGeert Uytterhoeven /* Maintain the strobe during 40 us */
58d47d8836SGeert Uytterhoeven udelay(40);
59d47d8836SGeert Uytterhoeven
60d47d8836SGeert Uytterhoeven gpiod_set_value_cansleep(hd->pins[PIN_CTRL_E], 0);
61d47d8836SGeert Uytterhoeven }
62d47d8836SGeert Uytterhoeven
63d47d8836SGeert Uytterhoeven /* write to an LCD panel register in 8 bit GPIO mode */
hd44780_write_gpio8(struct hd44780 * hd,u8 val,unsigned int rs)64d47d8836SGeert Uytterhoeven static void hd44780_write_gpio8(struct hd44780 *hd, u8 val, unsigned int rs)
65d47d8836SGeert Uytterhoeven {
66b9762bebSJanusz Krzysztofik DECLARE_BITMAP(values, 10); /* for DATA[0-7], RS, RW */
67b9762bebSJanusz Krzysztofik unsigned int n;
68d47d8836SGeert Uytterhoeven
69b9762bebSJanusz Krzysztofik values[0] = val;
70b9762bebSJanusz Krzysztofik __assign_bit(8, values, rs);
71b9762bebSJanusz Krzysztofik n = hd->pins[PIN_CTRL_RW] ? 10 : 9;
72d47d8836SGeert Uytterhoeven
73d47d8836SGeert Uytterhoeven /* Present the data to the port */
7477588c14SJanusz Krzysztofik gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], NULL, values);
75d47d8836SGeert Uytterhoeven
76d47d8836SGeert Uytterhoeven hd44780_strobe_gpio(hd);
77d47d8836SGeert Uytterhoeven }
78d47d8836SGeert Uytterhoeven
79d47d8836SGeert Uytterhoeven /* write to an LCD panel register in 4 bit GPIO mode */
hd44780_write_gpio4(struct hd44780 * hd,u8 val,unsigned int rs)80d47d8836SGeert Uytterhoeven static void hd44780_write_gpio4(struct hd44780 *hd, u8 val, unsigned int rs)
81d47d8836SGeert Uytterhoeven {
82b9762bebSJanusz Krzysztofik DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */
83b9762bebSJanusz Krzysztofik unsigned int n;
84d47d8836SGeert Uytterhoeven
85d47d8836SGeert Uytterhoeven /* High nibble + RS, RW */
86b9762bebSJanusz Krzysztofik values[0] = val >> 4;
87b9762bebSJanusz Krzysztofik __assign_bit(4, values, rs);
88b9762bebSJanusz Krzysztofik n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
89d47d8836SGeert Uytterhoeven
90d47d8836SGeert Uytterhoeven /* Present the data to the port */
9177588c14SJanusz Krzysztofik gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
92d47d8836SGeert Uytterhoeven
93d47d8836SGeert Uytterhoeven hd44780_strobe_gpio(hd);
94d47d8836SGeert Uytterhoeven
95d47d8836SGeert Uytterhoeven /* Low nibble */
96b9762bebSJanusz Krzysztofik values[0] &= ~0x0fUL;
97b9762bebSJanusz Krzysztofik values[0] |= val & 0x0f;
98d47d8836SGeert Uytterhoeven
99d47d8836SGeert Uytterhoeven /* Present the data to the port */
10077588c14SJanusz Krzysztofik gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
101d47d8836SGeert Uytterhoeven
102d47d8836SGeert Uytterhoeven hd44780_strobe_gpio(hd);
103d47d8836SGeert Uytterhoeven }
104d47d8836SGeert Uytterhoeven
105d47d8836SGeert Uytterhoeven /* Send a command to the LCD panel in 8 bit GPIO mode */
hd44780_write_cmd_gpio8(struct hd44780_common * hdc,int cmd)1062c6a82f2SLars Poeschel static void hd44780_write_cmd_gpio8(struct hd44780_common *hdc, int cmd)
107d47d8836SGeert Uytterhoeven {
1082545c1c9SLars Poeschel struct hd44780 *hd = hdc->hd44780;
109d47d8836SGeert Uytterhoeven
110d47d8836SGeert Uytterhoeven hd44780_write_gpio8(hd, cmd, 0);
111d47d8836SGeert Uytterhoeven
112d47d8836SGeert Uytterhoeven /* The shortest command takes at least 120 us */
113d47d8836SGeert Uytterhoeven udelay(120);
114d47d8836SGeert Uytterhoeven }
115d47d8836SGeert Uytterhoeven
116d47d8836SGeert Uytterhoeven /* Send data to the LCD panel in 8 bit GPIO mode */
hd44780_write_data_gpio8(struct hd44780_common * hdc,int data)11771ff701bSLars Poeschel static void hd44780_write_data_gpio8(struct hd44780_common *hdc, int data)
118d47d8836SGeert Uytterhoeven {
1192545c1c9SLars Poeschel struct hd44780 *hd = hdc->hd44780;
120d47d8836SGeert Uytterhoeven
121d47d8836SGeert Uytterhoeven hd44780_write_gpio8(hd, data, 1);
122d47d8836SGeert Uytterhoeven
123d47d8836SGeert Uytterhoeven /* The shortest data takes at least 45 us */
124d47d8836SGeert Uytterhoeven udelay(45);
125d47d8836SGeert Uytterhoeven }
126d47d8836SGeert Uytterhoeven
127d47d8836SGeert Uytterhoeven static const struct charlcd_ops hd44780_ops_gpio8 = {
128d47d8836SGeert Uytterhoeven .backlight = hd44780_backlight,
129b26deabbSLars Poeschel .print = hd44780_common_print,
130d3a2fb81SLars Poeschel .gotoxy = hd44780_common_gotoxy,
13188645a86SLars Poeschel .home = hd44780_common_home,
13245421ffeSLars Poeschel .clear_display = hd44780_common_clear_display,
13301ec46dfSLars Poeschel .init_display = hd44780_common_init_display,
134d2f2187eSLars Poeschel .shift_cursor = hd44780_common_shift_cursor,
135d2f2187eSLars Poeschel .shift_display = hd44780_common_shift_display,
136d2f2187eSLars Poeschel .display = hd44780_common_display,
137d2f2187eSLars Poeschel .cursor = hd44780_common_cursor,
138d2f2187eSLars Poeschel .blink = hd44780_common_blink,
139d2f2187eSLars Poeschel .fontsize = hd44780_common_fontsize,
140d2f2187eSLars Poeschel .lines = hd44780_common_lines,
141339acb08SLars Poeschel .redefine_char = hd44780_common_redefine_char,
142d47d8836SGeert Uytterhoeven };
143d47d8836SGeert Uytterhoeven
144d47d8836SGeert Uytterhoeven /* Send a command to the LCD panel in 4 bit GPIO mode */
hd44780_write_cmd_gpio4(struct hd44780_common * hdc,int cmd)1452c6a82f2SLars Poeschel static void hd44780_write_cmd_gpio4(struct hd44780_common *hdc, int cmd)
146d47d8836SGeert Uytterhoeven {
1472545c1c9SLars Poeschel struct hd44780 *hd = hdc->hd44780;
148d47d8836SGeert Uytterhoeven
149d47d8836SGeert Uytterhoeven hd44780_write_gpio4(hd, cmd, 0);
150d47d8836SGeert Uytterhoeven
151d47d8836SGeert Uytterhoeven /* The shortest command takes at least 120 us */
152d47d8836SGeert Uytterhoeven udelay(120);
153d47d8836SGeert Uytterhoeven }
154d47d8836SGeert Uytterhoeven
155d47d8836SGeert Uytterhoeven /* Send 4-bits of a command to the LCD panel in raw 4 bit GPIO mode */
hd44780_write_cmd_raw_gpio4(struct hd44780_common * hdc,int cmd)1562c6a82f2SLars Poeschel static void hd44780_write_cmd_raw_gpio4(struct hd44780_common *hdc, int cmd)
157d47d8836SGeert Uytterhoeven {
158b9762bebSJanusz Krzysztofik DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */
1592545c1c9SLars Poeschel struct hd44780 *hd = hdc->hd44780;
160b9762bebSJanusz Krzysztofik unsigned int n;
161d47d8836SGeert Uytterhoeven
162d47d8836SGeert Uytterhoeven /* Command nibble + RS, RW */
163b9762bebSJanusz Krzysztofik values[0] = cmd & 0x0f;
164b9762bebSJanusz Krzysztofik n = hd->pins[PIN_CTRL_RW] ? 6 : 5;
165d47d8836SGeert Uytterhoeven
166d47d8836SGeert Uytterhoeven /* Present the data to the port */
16777588c14SJanusz Krzysztofik gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);
168d47d8836SGeert Uytterhoeven
169d47d8836SGeert Uytterhoeven hd44780_strobe_gpio(hd);
170d47d8836SGeert Uytterhoeven }
171d47d8836SGeert Uytterhoeven
172d47d8836SGeert Uytterhoeven /* Send data to the LCD panel in 4 bit GPIO mode */
hd44780_write_data_gpio4(struct hd44780_common * hdc,int data)17371ff701bSLars Poeschel static void hd44780_write_data_gpio4(struct hd44780_common *hdc, int data)
174d47d8836SGeert Uytterhoeven {
1752545c1c9SLars Poeschel struct hd44780 *hd = hdc->hd44780;
176d47d8836SGeert Uytterhoeven
177d47d8836SGeert Uytterhoeven hd44780_write_gpio4(hd, data, 1);
178d47d8836SGeert Uytterhoeven
179d47d8836SGeert Uytterhoeven /* The shortest data takes at least 45 us */
180d47d8836SGeert Uytterhoeven udelay(45);
181d47d8836SGeert Uytterhoeven }
182d47d8836SGeert Uytterhoeven
183d47d8836SGeert Uytterhoeven static const struct charlcd_ops hd44780_ops_gpio4 = {
184d47d8836SGeert Uytterhoeven .backlight = hd44780_backlight,
185b26deabbSLars Poeschel .print = hd44780_common_print,
186d3a2fb81SLars Poeschel .gotoxy = hd44780_common_gotoxy,
18788645a86SLars Poeschel .home = hd44780_common_home,
18845421ffeSLars Poeschel .clear_display = hd44780_common_clear_display,
18901ec46dfSLars Poeschel .init_display = hd44780_common_init_display,
190d2f2187eSLars Poeschel .shift_cursor = hd44780_common_shift_cursor,
191d2f2187eSLars Poeschel .shift_display = hd44780_common_shift_display,
192d2f2187eSLars Poeschel .display = hd44780_common_display,
193d2f2187eSLars Poeschel .cursor = hd44780_common_cursor,
194d2f2187eSLars Poeschel .blink = hd44780_common_blink,
195d2f2187eSLars Poeschel .fontsize = hd44780_common_fontsize,
196d2f2187eSLars Poeschel .lines = hd44780_common_lines,
197339acb08SLars Poeschel .redefine_char = hd44780_common_redefine_char,
198d47d8836SGeert Uytterhoeven };
199d47d8836SGeert Uytterhoeven
hd44780_probe(struct platform_device * pdev)200d47d8836SGeert Uytterhoeven static int hd44780_probe(struct platform_device *pdev)
201d47d8836SGeert Uytterhoeven {
202d47d8836SGeert Uytterhoeven struct device *dev = &pdev->dev;
203d47d8836SGeert Uytterhoeven unsigned int i, base;
204d47d8836SGeert Uytterhoeven struct charlcd *lcd;
205718e05edSLars Poeschel struct hd44780_common *hdc;
206d47d8836SGeert Uytterhoeven struct hd44780 *hd;
207718e05edSLars Poeschel int ifwidth, ret = -ENOMEM;
208d47d8836SGeert Uytterhoeven
209d47d8836SGeert Uytterhoeven /* Required pins */
210d47d8836SGeert Uytterhoeven ifwidth = gpiod_count(dev, "data");
211d47d8836SGeert Uytterhoeven if (ifwidth < 0)
212d47d8836SGeert Uytterhoeven return ifwidth;
213d47d8836SGeert Uytterhoeven
214d47d8836SGeert Uytterhoeven switch (ifwidth) {
215d47d8836SGeert Uytterhoeven case 4:
216d47d8836SGeert Uytterhoeven base = PIN_DATA4;
217d47d8836SGeert Uytterhoeven break;
218d47d8836SGeert Uytterhoeven case 8:
219d47d8836SGeert Uytterhoeven base = PIN_DATA0;
220d47d8836SGeert Uytterhoeven break;
221d47d8836SGeert Uytterhoeven default:
222d47d8836SGeert Uytterhoeven return -EINVAL;
223d47d8836SGeert Uytterhoeven }
224d47d8836SGeert Uytterhoeven
225718e05edSLars Poeschel hdc = hd44780_common_alloc();
226718e05edSLars Poeschel if (!hdc)
227d47d8836SGeert Uytterhoeven return -ENOMEM;
228d47d8836SGeert Uytterhoeven
2292545c1c9SLars Poeschel lcd = charlcd_alloc();
230718e05edSLars Poeschel if (!lcd)
231718e05edSLars Poeschel goto fail1;
232d47d8836SGeert Uytterhoeven
233*632691adSErick Archer hd = kzalloc(sizeof(*hd), GFP_KERNEL);
234718e05edSLars Poeschel if (!hd)
235718e05edSLars Poeschel goto fail2;
236718e05edSLars Poeschel
237718e05edSLars Poeschel hdc->hd44780 = hd;
238718e05edSLars Poeschel lcd->drvdata = hdc;
239d47d8836SGeert Uytterhoeven for (i = 0; i < ifwidth; i++) {
240d47d8836SGeert Uytterhoeven hd->pins[base + i] = devm_gpiod_get_index(dev, "data", i,
241d47d8836SGeert Uytterhoeven GPIOD_OUT_LOW);
242d47d8836SGeert Uytterhoeven if (IS_ERR(hd->pins[base + i])) {
243d47d8836SGeert Uytterhoeven ret = PTR_ERR(hd->pins[base + i]);
244718e05edSLars Poeschel goto fail3;
245d47d8836SGeert Uytterhoeven }
246d47d8836SGeert Uytterhoeven }
247d47d8836SGeert Uytterhoeven
248d47d8836SGeert Uytterhoeven hd->pins[PIN_CTRL_E] = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
249d47d8836SGeert Uytterhoeven if (IS_ERR(hd->pins[PIN_CTRL_E])) {
250d47d8836SGeert Uytterhoeven ret = PTR_ERR(hd->pins[PIN_CTRL_E]);
251718e05edSLars Poeschel goto fail3;
252d47d8836SGeert Uytterhoeven }
253d47d8836SGeert Uytterhoeven
254d47d8836SGeert Uytterhoeven hd->pins[PIN_CTRL_RS] = devm_gpiod_get(dev, "rs", GPIOD_OUT_HIGH);
255d47d8836SGeert Uytterhoeven if (IS_ERR(hd->pins[PIN_CTRL_RS])) {
256d47d8836SGeert Uytterhoeven ret = PTR_ERR(hd->pins[PIN_CTRL_RS]);
257718e05edSLars Poeschel goto fail3;
258d47d8836SGeert Uytterhoeven }
259d47d8836SGeert Uytterhoeven
260d47d8836SGeert Uytterhoeven /* Optional pins */
261d47d8836SGeert Uytterhoeven hd->pins[PIN_CTRL_RW] = devm_gpiod_get_optional(dev, "rw",
262d47d8836SGeert Uytterhoeven GPIOD_OUT_LOW);
263d47d8836SGeert Uytterhoeven if (IS_ERR(hd->pins[PIN_CTRL_RW])) {
264d47d8836SGeert Uytterhoeven ret = PTR_ERR(hd->pins[PIN_CTRL_RW]);
265718e05edSLars Poeschel goto fail3;
266d47d8836SGeert Uytterhoeven }
267d47d8836SGeert Uytterhoeven
268d47d8836SGeert Uytterhoeven hd->pins[PIN_CTRL_BL] = devm_gpiod_get_optional(dev, "backlight",
269d47d8836SGeert Uytterhoeven GPIOD_OUT_LOW);
270d47d8836SGeert Uytterhoeven if (IS_ERR(hd->pins[PIN_CTRL_BL])) {
271d47d8836SGeert Uytterhoeven ret = PTR_ERR(hd->pins[PIN_CTRL_BL]);
272718e05edSLars Poeschel goto fail3;
273d47d8836SGeert Uytterhoeven }
274d47d8836SGeert Uytterhoeven
275d47d8836SGeert Uytterhoeven /* Required properties */
276c7c3f096SGeert Uytterhoeven ret = device_property_read_u32(dev, "display-height-chars",
277c7c3f096SGeert Uytterhoeven &lcd->height);
278d47d8836SGeert Uytterhoeven if (ret)
279718e05edSLars Poeschel goto fail3;
280c7c3f096SGeert Uytterhoeven ret = device_property_read_u32(dev, "display-width-chars", &lcd->width);
281d47d8836SGeert Uytterhoeven if (ret)
282718e05edSLars Poeschel goto fail3;
283d47d8836SGeert Uytterhoeven
284d47d8836SGeert Uytterhoeven /*
285d47d8836SGeert Uytterhoeven * On displays with more than two rows, the internal buffer width is
286d47d8836SGeert Uytterhoeven * usually equal to the display width
287d47d8836SGeert Uytterhoeven */
288d47d8836SGeert Uytterhoeven if (lcd->height > 2)
2892545c1c9SLars Poeschel hdc->bwidth = lcd->width;
290d47d8836SGeert Uytterhoeven
291d47d8836SGeert Uytterhoeven /* Optional properties */
2922545c1c9SLars Poeschel device_property_read_u32(dev, "internal-buffer-width", &hdc->bwidth);
293d47d8836SGeert Uytterhoeven
2943fc04dd7SLars Poeschel hdc->ifwidth = ifwidth;
29571ff701bSLars Poeschel if (ifwidth == 8) {
29671ff701bSLars Poeschel lcd->ops = &hd44780_ops_gpio8;
29771ff701bSLars Poeschel hdc->write_data = hd44780_write_data_gpio8;
2982c6a82f2SLars Poeschel hdc->write_cmd = hd44780_write_cmd_gpio8;
29971ff701bSLars Poeschel } else {
30071ff701bSLars Poeschel lcd->ops = &hd44780_ops_gpio4;
30171ff701bSLars Poeschel hdc->write_data = hd44780_write_data_gpio4;
3022c6a82f2SLars Poeschel hdc->write_cmd = hd44780_write_cmd_gpio4;
3032c6a82f2SLars Poeschel hdc->write_cmd_raw4 = hd44780_write_cmd_raw_gpio4;
30471ff701bSLars Poeschel }
305d47d8836SGeert Uytterhoeven
306d47d8836SGeert Uytterhoeven ret = charlcd_register(lcd);
307d47d8836SGeert Uytterhoeven if (ret)
308718e05edSLars Poeschel goto fail3;
309d47d8836SGeert Uytterhoeven
310d47d8836SGeert Uytterhoeven platform_set_drvdata(pdev, lcd);
311d47d8836SGeert Uytterhoeven return 0;
312d47d8836SGeert Uytterhoeven
313718e05edSLars Poeschel fail3:
314718e05edSLars Poeschel kfree(hd);
315718e05edSLars Poeschel fail2:
316718e05edSLars Poeschel kfree(lcd);
317718e05edSLars Poeschel fail1:
318718e05edSLars Poeschel kfree(hdc);
319d47d8836SGeert Uytterhoeven return ret;
320d47d8836SGeert Uytterhoeven }
321d47d8836SGeert Uytterhoeven
hd44780_remove(struct platform_device * pdev)3229ea02f7cSUwe Kleine-König static void hd44780_remove(struct platform_device *pdev)
323d47d8836SGeert Uytterhoeven {
324d47d8836SGeert Uytterhoeven struct charlcd *lcd = platform_get_drvdata(pdev);
325ddf75a86SJianglei Nie struct hd44780_common *hdc = lcd->drvdata;
326d47d8836SGeert Uytterhoeven
327d47d8836SGeert Uytterhoeven charlcd_unregister(lcd);
328ddf75a86SJianglei Nie kfree(hdc->hd44780);
329333ff32dSLars Poeschel kfree(lcd->drvdata);
33041c8d0adSAndy Shevchenko
331718e05edSLars Poeschel kfree(lcd);
332d47d8836SGeert Uytterhoeven }
333d47d8836SGeert Uytterhoeven
334d47d8836SGeert Uytterhoeven static const struct of_device_id hd44780_of_match[] = {
335d47d8836SGeert Uytterhoeven { .compatible = "hit,hd44780" },
336d47d8836SGeert Uytterhoeven { /* sentinel */ }
337d47d8836SGeert Uytterhoeven };
338d47d8836SGeert Uytterhoeven MODULE_DEVICE_TABLE(of, hd44780_of_match);
339d47d8836SGeert Uytterhoeven
340d47d8836SGeert Uytterhoeven static struct platform_driver hd44780_driver = {
341d47d8836SGeert Uytterhoeven .probe = hd44780_probe,
3429ea02f7cSUwe Kleine-König .remove_new = hd44780_remove,
343d47d8836SGeert Uytterhoeven .driver = {
344d47d8836SGeert Uytterhoeven .name = "hd44780",
345d47d8836SGeert Uytterhoeven .of_match_table = hd44780_of_match,
346d47d8836SGeert Uytterhoeven },
347d47d8836SGeert Uytterhoeven };
348d47d8836SGeert Uytterhoeven
349d47d8836SGeert Uytterhoeven module_platform_driver(hd44780_driver);
350d47d8836SGeert Uytterhoeven MODULE_DESCRIPTION("HD44780 Character LCD driver");
351d47d8836SGeert Uytterhoeven MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
352d47d8836SGeert Uytterhoeven MODULE_LICENSE("GPL");
353