1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * LCD / Backlight control code for Sharp SL-6000x (tosa)
4 *
5 * Copyright (c) 2005 Dirk Opfer
6 * Copyright (c) 2007,2008 Dmitry Baryshkov
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/device.h>
12 #include <linux/spi/spi.h>
13 #include <linux/i2c.h>
14 #include <linux/slab.h>
15 #include <linux/gpio/consumer.h>
16 #include <linux/delay.h>
17 #include <linux/lcd.h>
18 #include <linux/fb.h>
19
20 #include <asm/mach/sharpsl_param.h>
21
22 #include "tosa_bl.h"
23
24 #define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
25
26 #define TG_REG0_VQV 0x0001
27 #define TG_REG0_COLOR 0x0002
28 #define TG_REG0_UD 0x0004
29 #define TG_REG0_LR 0x0008
30
31 /*
32 * Timing Generator
33 */
34 #define TG_PNLCTL 0x00
35 #define TG_TPOSCTL 0x01
36 #define TG_DUTYCTL 0x02
37 #define TG_GPOSR 0x03
38 #define TG_GPODR1 0x04
39 #define TG_GPODR2 0x05
40 #define TG_PINICTL 0x06
41 #define TG_HPOSCTL 0x07
42
43
44 #define DAC_BASE 0x4e
45
46 struct tosa_lcd_data {
47 struct spi_device *spi;
48 struct lcd_device *lcd;
49 struct i2c_client *i2c;
50 struct gpio_desc *gpiod_tg;
51
52 int lcd_power;
53 bool is_vga;
54 };
55
tosa_tg_send(struct spi_device * spi,int adrs,uint8_t data)56 static int tosa_tg_send(struct spi_device *spi, int adrs, uint8_t data)
57 {
58 u8 buf[1];
59 struct spi_message msg;
60 struct spi_transfer xfer = {
61 .len = 1,
62 .cs_change = 0,
63 .tx_buf = buf,
64 };
65
66 buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
67 spi_message_init(&msg);
68 spi_message_add_tail(&xfer, &msg);
69
70 return spi_sync(spi, &msg);
71 }
72
tosa_bl_enable(struct spi_device * spi,int enable)73 int tosa_bl_enable(struct spi_device *spi, int enable)
74 {
75 /* bl_enable GP04=1 otherwise GP04=0*/
76 return tosa_tg_send(spi, TG_GPODR2, enable ? 0x01 : 0x00);
77 }
78 EXPORT_SYMBOL(tosa_bl_enable);
79
tosa_lcd_tg_init(struct tosa_lcd_data * data)80 static void tosa_lcd_tg_init(struct tosa_lcd_data *data)
81 {
82 /* TG on */
83 gpiod_set_value(data->gpiod_tg, 0);
84
85 mdelay(60);
86
87 /* delayed 0clk TCTL signal for VGA */
88 tosa_tg_send(data->spi, TG_TPOSCTL, 0x00);
89 /* GPOS0=powercontrol, GPOS1=GPIO, GPOS2=TCTL */
90 tosa_tg_send(data->spi, TG_GPOSR, 0x02);
91 }
92
tosa_lcd_tg_on(struct tosa_lcd_data * data)93 static void tosa_lcd_tg_on(struct tosa_lcd_data *data)
94 {
95 struct spi_device *spi = data->spi;
96 int value = TG_REG0_COLOR | TG_REG0_UD | TG_REG0_LR;
97
98 if (data->is_vga)
99 value |= TG_REG0_VQV;
100
101 tosa_tg_send(spi, TG_PNLCTL, value);
102
103 /* TG LCD pannel power up */
104 tosa_tg_send(spi, TG_PINICTL, 0x4);
105 mdelay(50);
106
107 /* TG LCD GVSS */
108 tosa_tg_send(spi, TG_PINICTL, 0x0);
109
110 if (IS_ERR_OR_NULL(data->i2c)) {
111 /*
112 * after the pannel is powered up the first time,
113 * we can access the i2c bus so probe for the DAC
114 */
115 struct i2c_adapter *adap = i2c_get_adapter(0);
116 struct i2c_board_info info = {
117 .dev_name = "tosa-bl",
118 .type = "tosa-bl",
119 .addr = DAC_BASE,
120 .platform_data = data->spi,
121 };
122 data->i2c = i2c_new_client_device(adap, &info);
123 }
124 }
125
tosa_lcd_tg_off(struct tosa_lcd_data * data)126 static void tosa_lcd_tg_off(struct tosa_lcd_data *data)
127 {
128 struct spi_device *spi = data->spi;
129
130 /* TG LCD VHSA off */
131 tosa_tg_send(spi, TG_PINICTL, 0x4);
132 mdelay(50);
133
134 /* TG LCD signal off */
135 tosa_tg_send(spi, TG_PINICTL, 0x6);
136 mdelay(50);
137
138 /* TG Off */
139 gpiod_set_value(data->gpiod_tg, 1);
140 mdelay(100);
141 }
142
tosa_lcd_set_power(struct lcd_device * lcd,int power)143 int tosa_lcd_set_power(struct lcd_device *lcd, int power)
144 {
145 struct tosa_lcd_data *data = lcd_get_data(lcd);
146
147 if (POWER_IS_ON(power) && !POWER_IS_ON(data->lcd_power))
148 tosa_lcd_tg_on(data);
149
150 if (!POWER_IS_ON(power) && POWER_IS_ON(data->lcd_power))
151 tosa_lcd_tg_off(data);
152
153 data->lcd_power = power;
154 return 0;
155 }
156
tosa_lcd_get_power(struct lcd_device * lcd)157 static int tosa_lcd_get_power(struct lcd_device *lcd)
158 {
159 struct tosa_lcd_data *data = lcd_get_data(lcd);
160
161 return data->lcd_power;
162 }
163
tosa_lcd_set_mode(struct lcd_device * lcd,struct fb_videomode * mode)164 static int tosa_lcd_set_mode(struct lcd_device *lcd, struct fb_videomode *mode)
165 {
166 struct tosa_lcd_data *data = lcd_get_data(lcd);
167
168 if (mode->xres == 320 || mode->yres == 320)
169 data->is_vga = false;
170 else
171 data->is_vga = true;
172
173 if (POWER_IS_ON(data->lcd_power))
174 tosa_lcd_tg_on(data);
175
176 return 0;
177 }
178
179 static struct lcd_ops tosa_lcd_ops = {
180 .set_power = tosa_lcd_set_power,
181 .get_power = tosa_lcd_get_power,
182 .set_mode = tosa_lcd_set_mode,
183 };
184
tosa_lcd_probe(struct spi_device * spi)185 static int tosa_lcd_probe(struct spi_device *spi)
186 {
187 int ret;
188 struct tosa_lcd_data *data;
189
190 data = devm_kzalloc(&spi->dev, sizeof(struct tosa_lcd_data),
191 GFP_KERNEL);
192 if (!data)
193 return -ENOMEM;
194
195 data->is_vga = true; /* default to VGA mode */
196
197 /*
198 * bits_per_word cannot be configured in platform data
199 */
200 spi->bits_per_word = 8;
201
202 ret = spi_setup(spi);
203 if (ret < 0)
204 return ret;
205
206 data->spi = spi;
207 spi_set_drvdata(spi, data);
208
209 data->gpiod_tg = devm_gpiod_get(&spi->dev, "tg #pwr", GPIOD_OUT_LOW);
210 if (IS_ERR(data->gpiod_tg))
211 return PTR_ERR(data->gpiod_tg);
212
213 mdelay(60);
214
215 tosa_lcd_tg_init(data);
216
217 tosa_lcd_tg_on(data);
218
219 data->lcd = devm_lcd_device_register(&spi->dev, "tosa-lcd", &spi->dev,
220 data, &tosa_lcd_ops);
221
222 if (IS_ERR(data->lcd)) {
223 ret = PTR_ERR(data->lcd);
224 data->lcd = NULL;
225 goto err_register;
226 }
227
228 return 0;
229
230 err_register:
231 tosa_lcd_tg_off(data);
232 return ret;
233 }
234
tosa_lcd_remove(struct spi_device * spi)235 static void tosa_lcd_remove(struct spi_device *spi)
236 {
237 struct tosa_lcd_data *data = spi_get_drvdata(spi);
238
239 i2c_unregister_device(data->i2c);
240
241 tosa_lcd_tg_off(data);
242 }
243
244 #ifdef CONFIG_PM_SLEEP
tosa_lcd_suspend(struct device * dev)245 static int tosa_lcd_suspend(struct device *dev)
246 {
247 struct tosa_lcd_data *data = dev_get_drvdata(dev);
248
249 tosa_lcd_tg_off(data);
250
251 return 0;
252 }
253
tosa_lcd_resume(struct device * dev)254 static int tosa_lcd_resume(struct device *dev)
255 {
256 struct tosa_lcd_data *data = dev_get_drvdata(dev);
257
258 tosa_lcd_tg_init(data);
259 if (POWER_IS_ON(data->lcd_power))
260 tosa_lcd_tg_on(data);
261 else
262 tosa_lcd_tg_off(data);
263
264 return 0;
265 }
266 #endif
267
268 static SIMPLE_DEV_PM_OPS(tosa_lcd_pm_ops, tosa_lcd_suspend, tosa_lcd_resume);
269
270 static struct spi_driver tosa_lcd_driver = {
271 .driver = {
272 .name = "tosa-lcd",
273 .pm = &tosa_lcd_pm_ops,
274 },
275 .probe = tosa_lcd_probe,
276 .remove = tosa_lcd_remove,
277 };
278
279 module_spi_driver(tosa_lcd_driver);
280
281 MODULE_AUTHOR("Dmitry Baryshkov");
282 MODULE_LICENSE("GPL v2");
283 MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
284 MODULE_ALIAS("spi:tosa-lcd");
285