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
46struct 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
56static 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
73int 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}
78EXPORT_SYMBOL(tosa_bl_enable);
79
80static 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
93static 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
126static 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
143int 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
157static 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
164static 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
179static 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
185static 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
230err_register:
231	tosa_lcd_tg_off(data);
232	return ret;
233}
234
235static int 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	return 0;
244}
245
246#ifdef CONFIG_PM_SLEEP
247static int tosa_lcd_suspend(struct device *dev)
248{
249	struct tosa_lcd_data *data = dev_get_drvdata(dev);
250
251	tosa_lcd_tg_off(data);
252
253	return 0;
254}
255
256static int tosa_lcd_resume(struct device *dev)
257{
258	struct tosa_lcd_data *data = dev_get_drvdata(dev);
259
260	tosa_lcd_tg_init(data);
261	if (POWER_IS_ON(data->lcd_power))
262		tosa_lcd_tg_on(data);
263	else
264		tosa_lcd_tg_off(data);
265
266	return 0;
267}
268#endif
269
270static SIMPLE_DEV_PM_OPS(tosa_lcd_pm_ops, tosa_lcd_suspend, tosa_lcd_resume);
271
272static struct spi_driver tosa_lcd_driver = {
273	.driver = {
274		.name		= "tosa-lcd",
275		.pm		= &tosa_lcd_pm_ops,
276	},
277	.probe		= tosa_lcd_probe,
278	.remove		= tosa_lcd_remove,
279};
280
281module_spi_driver(tosa_lcd_driver);
282
283MODULE_AUTHOR("Dmitry Baryshkov");
284MODULE_LICENSE("GPL v2");
285MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
286MODULE_ALIAS("spi:tosa-lcd");
287