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11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/device.h>
14#include <linux/kernel.h>
15#include <linux/delay.h>
16#include <linux/module.h>
17#include <linux/gpio.h>
18#include <linux/lcd.h>
19#include <linux/slab.h>
20#include <linux/regulator/consumer.h>
21
22#include <linux/spi/spi.h>
23#include <linux/spi/l4f00242t03.h>
24
25struct l4f00242t03_priv {
26 struct spi_device *spi;
27 struct lcd_device *ld;
28 int lcd_state;
29 struct regulator *io_reg;
30 struct regulator *core_reg;
31};
32
33static void l4f00242t03_reset(unsigned int gpio)
34{
35 pr_debug("l4f00242t03_reset.\n");
36 gpio_set_value(gpio, 1);
37 mdelay(100);
38 gpio_set_value(gpio, 0);
39 mdelay(10);
40 gpio_set_value(gpio, 1);
41 mdelay(20);
42}
43
44#define param(x) ((x) | 0x100)
45
46static void l4f00242t03_lcd_init(struct spi_device *spi)
47{
48 struct l4f00242t03_pdata *pdata = dev_get_platdata(&spi->dev);
49 struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
50 const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) };
51 int ret;
52
53 dev_dbg(&spi->dev, "initializing LCD\n");
54
55 ret = regulator_set_voltage(priv->io_reg, 1800000, 1800000);
56 if (ret) {
57 dev_err(&spi->dev, "failed to set the IO regulator voltage.\n");
58 return;
59 }
60 ret = regulator_enable(priv->io_reg);
61 if (ret) {
62 dev_err(&spi->dev, "failed to enable the IO regulator.\n");
63 return;
64 }
65
66 ret = regulator_set_voltage(priv->core_reg, 2800000, 2800000);
67 if (ret) {
68 dev_err(&spi->dev, "failed to set the core regulator voltage.\n");
69 regulator_disable(priv->io_reg);
70 return;
71 }
72 ret = regulator_enable(priv->core_reg);
73 if (ret) {
74 dev_err(&spi->dev, "failed to enable the core regulator.\n");
75 regulator_disable(priv->io_reg);
76 return;
77 }
78
79 l4f00242t03_reset(pdata->reset_gpio);
80
81 gpio_set_value(pdata->data_enable_gpio, 1);
82 msleep(60);
83 spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16));
84}
85
86static void l4f00242t03_lcd_powerdown(struct spi_device *spi)
87{
88 struct l4f00242t03_pdata *pdata = dev_get_platdata(&spi->dev);
89 struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
90
91 dev_dbg(&spi->dev, "Powering down LCD\n");
92
93 gpio_set_value(pdata->data_enable_gpio, 0);
94
95 regulator_disable(priv->io_reg);
96 regulator_disable(priv->core_reg);
97}
98
99static int l4f00242t03_lcd_power_get(struct lcd_device *ld)
100{
101 struct l4f00242t03_priv *priv = lcd_get_data(ld);
102
103 return priv->lcd_state;
104}
105
106static int l4f00242t03_lcd_power_set(struct lcd_device *ld, int power)
107{
108 struct l4f00242t03_priv *priv = lcd_get_data(ld);
109 struct spi_device *spi = priv->spi;
110
111 const u16 slpout = 0x11;
112 const u16 dison = 0x29;
113
114 const u16 slpin = 0x10;
115 const u16 disoff = 0x28;
116
117 if (power <= FB_BLANK_NORMAL) {
118 if (priv->lcd_state <= FB_BLANK_NORMAL) {
119
120 } else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
121 dev_dbg(&spi->dev, "Resuming LCD\n");
122
123 spi_write(spi, (const u8 *)&slpout, sizeof(u16));
124 msleep(60);
125 spi_write(spi, (const u8 *)&dison, sizeof(u16));
126 } else {
127
128 l4f00242t03_lcd_init(spi);
129 priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
130 l4f00242t03_lcd_power_set(priv->ld, power);
131 }
132 } else if (power < FB_BLANK_POWERDOWN) {
133 if (priv->lcd_state <= FB_BLANK_NORMAL) {
134
135 dev_dbg(&spi->dev, "Standby the LCD\n");
136
137 spi_write(spi, (const u8 *)&disoff, sizeof(u16));
138 msleep(60);
139 spi_write(spi, (const u8 *)&slpin, sizeof(u16));
140 } else if (priv->lcd_state < FB_BLANK_POWERDOWN) {
141
142 } else {
143
144 l4f00242t03_lcd_init(spi);
145 priv->lcd_state = FB_BLANK_UNBLANK;
146 l4f00242t03_lcd_power_set(ld, power);
147 }
148 } else {
149
150 if (priv->lcd_state != FB_BLANK_POWERDOWN) {
151
152 spi_write(spi, (const u8 *)&disoff, sizeof(u16));
153 msleep(60);
154 l4f00242t03_lcd_powerdown(spi);
155 }
156 }
157
158 priv->lcd_state = power;
159
160 return 0;
161}
162
163static struct lcd_ops l4f_ops = {
164 .set_power = l4f00242t03_lcd_power_set,
165 .get_power = l4f00242t03_lcd_power_get,
166};
167
168static int l4f00242t03_probe(struct spi_device *spi)
169{
170 struct l4f00242t03_priv *priv;
171 struct l4f00242t03_pdata *pdata = dev_get_platdata(&spi->dev);
172 int ret;
173
174 if (pdata == NULL) {
175 dev_err(&spi->dev, "Uninitialized platform data.\n");
176 return -EINVAL;
177 }
178
179 priv = devm_kzalloc(&spi->dev, sizeof(struct l4f00242t03_priv),
180 GFP_KERNEL);
181 if (priv == NULL)
182 return -ENOMEM;
183
184 spi_set_drvdata(spi, priv);
185 spi->bits_per_word = 9;
186 spi_setup(spi);
187
188 priv->spi = spi;
189
190 ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
191 GPIOF_OUT_INIT_HIGH, "lcd l4f00242t03 reset");
192 if (ret) {
193 dev_err(&spi->dev,
194 "Unable to get the lcd l4f00242t03 reset gpio.\n");
195 return ret;
196 }
197
198 ret = devm_gpio_request_one(&spi->dev, pdata->data_enable_gpio,
199 GPIOF_OUT_INIT_LOW, "lcd l4f00242t03 data enable");
200 if (ret) {
201 dev_err(&spi->dev,
202 "Unable to get the lcd l4f00242t03 data en gpio.\n");
203 return ret;
204 }
205
206 priv->io_reg = devm_regulator_get(&spi->dev, "vdd");
207 if (IS_ERR(priv->io_reg)) {
208 dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
209 __func__);
210 return PTR_ERR(priv->io_reg);
211 }
212
213 priv->core_reg = devm_regulator_get(&spi->dev, "vcore");
214 if (IS_ERR(priv->core_reg)) {
215 dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
216 __func__);
217 return PTR_ERR(priv->core_reg);
218 }
219
220 priv->ld = devm_lcd_device_register(&spi->dev, "l4f00242t03", &spi->dev,
221 priv, &l4f_ops);
222 if (IS_ERR(priv->ld))
223 return PTR_ERR(priv->ld);
224
225
226 l4f00242t03_lcd_init(spi);
227 priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
228 l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);
229
230 dev_info(&spi->dev, "Epson l4f00242t03 lcd probed.\n");
231
232 return 0;
233}
234
235static int l4f00242t03_remove(struct spi_device *spi)
236{
237 struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
238
239 l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
240 return 0;
241}
242
243static void l4f00242t03_shutdown(struct spi_device *spi)
244{
245 struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
246
247 if (priv)
248 l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_POWERDOWN);
249
250}
251
252static struct spi_driver l4f00242t03_driver = {
253 .driver = {
254 .name = "l4f00242t03",
255 },
256 .probe = l4f00242t03_probe,
257 .remove = l4f00242t03_remove,
258 .shutdown = l4f00242t03_shutdown,
259};
260
261module_spi_driver(l4f00242t03_driver);
262
263MODULE_AUTHOR("Alberto Panizzo <maramaopercheseimorto@gmail.com>");
264MODULE_DESCRIPTION("EPSON L4F00242T03 LCD");
265MODULE_LICENSE("GPL v2");
266
