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